4744 lines
142 KiB
C
4744 lines
142 KiB
C
/*
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* xHCI host controller driver
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*
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* Copyright (C) 2008 Intel Corp.
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*
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* Author: Sarah Sharp
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* Some code borrowed from the Linux EHCI driver.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/pci.h>
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#include <linux/irq.h>
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#include <linux/log2.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/slab.h>
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#include <linux/dmi.h>
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#include "xhci.h"
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#define DRIVER_AUTHOR "Sarah Sharp"
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#define DRIVER_DESC "'eXtensible' Host Controller (xHC) Driver"
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/* Some 0.95 hardware can't handle the chain bit on a Link TRB being cleared */
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static int link_quirk;
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module_param(link_quirk, int, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(link_quirk, "Don't clear the chain bit on a link TRB");
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/* TODO: copied from ehci-hcd.c - can this be refactored? */
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/*
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* xhci_handshake - spin reading hc until handshake completes or fails
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* @ptr: address of hc register to be read
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* @mask: bits to look at in result of read
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* @done: value of those bits when handshake succeeds
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* @usec: timeout in microseconds
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*
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* Returns negative errno, or zero on success
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*
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* Success happens when the "mask" bits have the specified value (hardware
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* handshake done). There are two failure modes: "usec" have passed (major
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* hardware flakeout), or the register reads as all-ones (hardware removed).
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*/
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int xhci_handshake(struct xhci_hcd *xhci, void __iomem *ptr,
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u32 mask, u32 done, int usec)
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{
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u32 result;
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do {
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result = xhci_readl(xhci, ptr);
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if (result == ~(u32)0) /* card removed */
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return -ENODEV;
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result &= mask;
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if (result == done)
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return 0;
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udelay(1);
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usec--;
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} while (usec > 0);
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return -ETIMEDOUT;
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}
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/*
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* Disable interrupts and begin the xHCI halting process.
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*/
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void xhci_quiesce(struct xhci_hcd *xhci)
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{
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u32 halted;
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u32 cmd;
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u32 mask;
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mask = ~(XHCI_IRQS);
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halted = xhci_readl(xhci, &xhci->op_regs->status) & STS_HALT;
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if (!halted)
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mask &= ~CMD_RUN;
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cmd = xhci_readl(xhci, &xhci->op_regs->command);
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cmd &= mask;
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xhci_writel(xhci, cmd, &xhci->op_regs->command);
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}
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/*
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* Force HC into halt state.
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*
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* Disable any IRQs and clear the run/stop bit.
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* HC will complete any current and actively pipelined transactions, and
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* should halt within 16 ms of the run/stop bit being cleared.
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* Read HC Halted bit in the status register to see when the HC is finished.
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*/
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int xhci_halt(struct xhci_hcd *xhci)
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{
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int ret;
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xhci_dbg(xhci, "// Halt the HC\n");
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xhci_quiesce(xhci);
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ret = xhci_handshake(xhci, &xhci->op_regs->status,
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STS_HALT, STS_HALT, XHCI_MAX_HALT_USEC);
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if (!ret) {
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xhci->xhc_state |= XHCI_STATE_HALTED;
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xhci->cmd_ring_state = CMD_RING_STATE_STOPPED;
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} else
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xhci_warn(xhci, "Host not halted after %u microseconds.\n",
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XHCI_MAX_HALT_USEC);
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return ret;
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}
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/*
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* Set the run bit and wait for the host to be running.
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*/
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static int xhci_start(struct xhci_hcd *xhci)
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{
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u32 temp;
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int ret;
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temp = xhci_readl(xhci, &xhci->op_regs->command);
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temp |= (CMD_RUN);
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xhci_dbg(xhci, "// Turn on HC, cmd = 0x%x.\n",
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temp);
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xhci_writel(xhci, temp, &xhci->op_regs->command);
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/*
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* Wait for the HCHalted Status bit to be 0 to indicate the host is
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* running.
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*/
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ret = xhci_handshake(xhci, &xhci->op_regs->status,
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STS_HALT, 0, XHCI_MAX_HALT_USEC);
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if (ret == -ETIMEDOUT)
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xhci_err(xhci, "Host took too long to start, "
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"waited %u microseconds.\n",
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XHCI_MAX_HALT_USEC);
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if (!ret)
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xhci->xhc_state &= ~XHCI_STATE_HALTED;
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return ret;
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}
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/*
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* Reset a halted HC.
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*
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* This resets pipelines, timers, counters, state machines, etc.
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* Transactions will be terminated immediately, and operational registers
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* will be set to their defaults.
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*/
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int xhci_reset(struct xhci_hcd *xhci)
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{
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u32 command;
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u32 state;
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int ret, i;
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state = xhci_readl(xhci, &xhci->op_regs->status);
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if ((state & STS_HALT) == 0) {
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xhci_warn(xhci, "Host controller not halted, aborting reset.\n");
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return 0;
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}
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xhci_dbg(xhci, "// Reset the HC\n");
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command = xhci_readl(xhci, &xhci->op_regs->command);
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command |= CMD_RESET;
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xhci_writel(xhci, command, &xhci->op_regs->command);
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ret = xhci_handshake(xhci, &xhci->op_regs->command,
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CMD_RESET, 0, 10 * 1000 * 1000);
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if (ret)
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return ret;
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xhci_dbg(xhci, "Wait for controller to be ready for doorbell rings\n");
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/*
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* xHCI cannot write to any doorbells or operational registers other
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* than status until the "Controller Not Ready" flag is cleared.
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*/
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ret = xhci_handshake(xhci, &xhci->op_regs->status,
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STS_CNR, 0, 10 * 1000 * 1000);
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for (i = 0; i < 2; ++i) {
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xhci->bus_state[i].port_c_suspend = 0;
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xhci->bus_state[i].suspended_ports = 0;
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xhci->bus_state[i].resuming_ports = 0;
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}
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return ret;
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}
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#ifdef CONFIG_PCI
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static int xhci_free_msi(struct xhci_hcd *xhci)
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{
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int i;
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if (!xhci->msix_entries)
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return -EINVAL;
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for (i = 0; i < xhci->msix_count; i++)
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if (xhci->msix_entries[i].vector)
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free_irq(xhci->msix_entries[i].vector,
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xhci_to_hcd(xhci));
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return 0;
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}
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/*
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* Set up MSI
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*/
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static int xhci_setup_msi(struct xhci_hcd *xhci)
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{
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int ret;
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struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
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ret = pci_enable_msi(pdev);
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if (ret) {
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xhci_dbg(xhci, "failed to allocate MSI entry\n");
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return ret;
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}
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ret = request_irq(pdev->irq, (irq_handler_t)xhci_msi_irq,
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0, "xhci_hcd", xhci_to_hcd(xhci));
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if (ret) {
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xhci_dbg(xhci, "disable MSI interrupt\n");
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pci_disable_msi(pdev);
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}
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return ret;
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}
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/*
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* Free IRQs
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* free all IRQs request
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*/
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static void xhci_free_irq(struct xhci_hcd *xhci)
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{
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struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
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int ret;
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/* return if using legacy interrupt */
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if (xhci_to_hcd(xhci)->irq > 0)
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return;
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ret = xhci_free_msi(xhci);
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if (!ret)
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return;
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if (pdev->irq > 0)
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free_irq(pdev->irq, xhci_to_hcd(xhci));
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return;
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}
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/*
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* Set up MSI-X
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*/
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static int xhci_setup_msix(struct xhci_hcd *xhci)
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{
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int i, ret = 0;
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struct usb_hcd *hcd = xhci_to_hcd(xhci);
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struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
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/*
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* calculate number of msi-x vectors supported.
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* - HCS_MAX_INTRS: the max number of interrupts the host can handle,
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* with max number of interrupters based on the xhci HCSPARAMS1.
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* - num_online_cpus: maximum msi-x vectors per CPUs core.
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* Add additional 1 vector to ensure always available interrupt.
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*/
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xhci->msix_count = min(num_online_cpus() + 1,
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HCS_MAX_INTRS(xhci->hcs_params1));
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xhci->msix_entries =
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kmalloc((sizeof(struct msix_entry))*xhci->msix_count,
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GFP_KERNEL);
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if (!xhci->msix_entries) {
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xhci_err(xhci, "Failed to allocate MSI-X entries\n");
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return -ENOMEM;
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}
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for (i = 0; i < xhci->msix_count; i++) {
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xhci->msix_entries[i].entry = i;
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xhci->msix_entries[i].vector = 0;
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}
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ret = pci_enable_msix(pdev, xhci->msix_entries, xhci->msix_count);
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if (ret) {
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xhci_dbg(xhci, "Failed to enable MSI-X\n");
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goto free_entries;
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}
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for (i = 0; i < xhci->msix_count; i++) {
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ret = request_irq(xhci->msix_entries[i].vector,
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(irq_handler_t)xhci_msi_irq,
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0, "xhci_hcd", xhci_to_hcd(xhci));
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if (ret)
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goto disable_msix;
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}
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hcd->msix_enabled = 1;
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return ret;
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disable_msix:
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xhci_dbg(xhci, "disable MSI-X interrupt\n");
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xhci_free_irq(xhci);
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pci_disable_msix(pdev);
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free_entries:
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kfree(xhci->msix_entries);
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xhci->msix_entries = NULL;
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return ret;
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}
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/* Free any IRQs and disable MSI-X */
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static void xhci_cleanup_msix(struct xhci_hcd *xhci)
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{
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struct usb_hcd *hcd = xhci_to_hcd(xhci);
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struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
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xhci_free_irq(xhci);
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if (xhci->msix_entries) {
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pci_disable_msix(pdev);
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kfree(xhci->msix_entries);
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xhci->msix_entries = NULL;
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} else {
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pci_disable_msi(pdev);
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}
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hcd->msix_enabled = 0;
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return;
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}
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static void xhci_msix_sync_irqs(struct xhci_hcd *xhci)
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{
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int i;
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if (xhci->msix_entries) {
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for (i = 0; i < xhci->msix_count; i++)
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synchronize_irq(xhci->msix_entries[i].vector);
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}
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}
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static int xhci_try_enable_msi(struct usb_hcd *hcd)
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{
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struct xhci_hcd *xhci = hcd_to_xhci(hcd);
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struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
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int ret;
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/*
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* Some Fresco Logic host controllers advertise MSI, but fail to
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* generate interrupts. Don't even try to enable MSI.
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*/
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if (xhci->quirks & XHCI_BROKEN_MSI)
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goto legacy_irq;
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/* unregister the legacy interrupt */
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if (hcd->irq)
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free_irq(hcd->irq, hcd);
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hcd->irq = 0;
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ret = xhci_setup_msix(xhci);
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if (ret)
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/* fall back to msi*/
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ret = xhci_setup_msi(xhci);
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if (!ret)
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/* hcd->irq is 0, we have MSI */
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return 0;
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if (!pdev->irq) {
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xhci_err(xhci, "No msi-x/msi found and no IRQ in BIOS\n");
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return -EINVAL;
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}
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legacy_irq:
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/* fall back to legacy interrupt*/
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ret = request_irq(pdev->irq, &usb_hcd_irq, IRQF_SHARED,
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hcd->irq_descr, hcd);
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if (ret) {
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xhci_err(xhci, "request interrupt %d failed\n",
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pdev->irq);
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return ret;
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}
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hcd->irq = pdev->irq;
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return 0;
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}
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#else
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static int xhci_try_enable_msi(struct usb_hcd *hcd)
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{
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return 0;
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}
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static void xhci_cleanup_msix(struct xhci_hcd *xhci)
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{
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}
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static void xhci_msix_sync_irqs(struct xhci_hcd *xhci)
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{
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}
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#endif
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static void compliance_mode_recovery(unsigned long arg)
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{
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struct xhci_hcd *xhci;
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struct usb_hcd *hcd;
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u32 temp;
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int i;
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xhci = (struct xhci_hcd *)arg;
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for (i = 0; i < xhci->num_usb3_ports; i++) {
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temp = xhci_readl(xhci, xhci->usb3_ports[i]);
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if ((temp & PORT_PLS_MASK) == USB_SS_PORT_LS_COMP_MOD) {
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/*
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* Compliance Mode Detected. Letting USB Core
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* handle the Warm Reset
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*/
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xhci_dbg(xhci, "Compliance Mode Detected->Port %d!\n",
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i + 1);
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xhci_dbg(xhci, "Attempting Recovery routine!\n");
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hcd = xhci->shared_hcd;
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if (hcd->state == HC_STATE_SUSPENDED)
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usb_hcd_resume_root_hub(hcd);
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|
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usb_hcd_poll_rh_status(hcd);
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}
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}
|
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|
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if (xhci->port_status_u0 != ((1 << xhci->num_usb3_ports)-1))
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mod_timer(&xhci->comp_mode_recovery_timer,
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jiffies + msecs_to_jiffies(COMP_MODE_RCVRY_MSECS));
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}
|
|
|
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/*
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* Quirk to work around issue generated by the SN65LVPE502CP USB3.0 re-driver
|
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* that causes ports behind that hardware to enter compliance mode sometimes.
|
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* The quirk creates a timer that polls every 2 seconds the link state of
|
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* each host controller's port and recovers it by issuing a Warm reset
|
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* if Compliance mode is detected, otherwise the port will become "dead" (no
|
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* device connections or disconnections will be detected anymore). Becasue no
|
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* status event is generated when entering compliance mode (per xhci spec),
|
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* this quirk is needed on systems that have the failing hardware installed.
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*/
|
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static void compliance_mode_recovery_timer_init(struct xhci_hcd *xhci)
|
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{
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xhci->port_status_u0 = 0;
|
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init_timer(&xhci->comp_mode_recovery_timer);
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|
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xhci->comp_mode_recovery_timer.data = (unsigned long) xhci;
|
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xhci->comp_mode_recovery_timer.function = compliance_mode_recovery;
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xhci->comp_mode_recovery_timer.expires = jiffies +
|
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msecs_to_jiffies(COMP_MODE_RCVRY_MSECS);
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|
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set_timer_slack(&xhci->comp_mode_recovery_timer,
|
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msecs_to_jiffies(COMP_MODE_RCVRY_MSECS));
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add_timer(&xhci->comp_mode_recovery_timer);
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xhci_dbg(xhci, "Compliance Mode Recovery Timer Initialized.\n");
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}
|
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|
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/*
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* This function identifies the systems that have installed the SN65LVPE502CP
|
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* USB3.0 re-driver and that need the Compliance Mode Quirk.
|
|
* Systems:
|
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* Vendor: Hewlett-Packard -> System Models: Z420, Z620 and Z820
|
|
*/
|
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static bool compliance_mode_recovery_timer_quirk_check(void)
|
|
{
|
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const char *dmi_product_name, *dmi_sys_vendor;
|
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|
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dmi_product_name = dmi_get_system_info(DMI_PRODUCT_NAME);
|
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dmi_sys_vendor = dmi_get_system_info(DMI_SYS_VENDOR);
|
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if (!dmi_product_name || !dmi_sys_vendor)
|
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return false;
|
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|
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if (!(strstr(dmi_sys_vendor, "Hewlett-Packard")))
|
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return false;
|
|
|
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if (strstr(dmi_product_name, "Z420") ||
|
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strstr(dmi_product_name, "Z620") ||
|
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strstr(dmi_product_name, "Z820") ||
|
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strstr(dmi_product_name, "Z1 Workstation"))
|
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return true;
|
|
|
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return false;
|
|
}
|
|
|
|
static int xhci_all_ports_seen_u0(struct xhci_hcd *xhci)
|
|
{
|
|
return (xhci->port_status_u0 == ((1 << xhci->num_usb3_ports)-1));
|
|
}
|
|
|
|
|
|
/*
|
|
* Initialize memory for HCD and xHC (one-time init).
|
|
*
|
|
* Program the PAGESIZE register, initialize the device context array, create
|
|
* device contexts (?), set up a command ring segment (or two?), create event
|
|
* ring (one for now).
|
|
*/
|
|
int xhci_init(struct usb_hcd *hcd)
|
|
{
|
|
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
|
|
int retval = 0;
|
|
|
|
xhci_dbg(xhci, "xhci_init\n");
|
|
spin_lock_init(&xhci->lock);
|
|
if (xhci->hci_version == 0x95 && link_quirk) {
|
|
xhci_dbg(xhci, "QUIRK: Not clearing Link TRB chain bits.\n");
|
|
xhci->quirks |= XHCI_LINK_TRB_QUIRK;
|
|
} else {
|
|
xhci_dbg(xhci, "xHCI doesn't need link TRB QUIRK\n");
|
|
}
|
|
retval = xhci_mem_init(xhci, GFP_KERNEL);
|
|
xhci_dbg(xhci, "Finished xhci_init\n");
|
|
|
|
/* Initializing Compliance Mode Recovery Data If Needed */
|
|
if (compliance_mode_recovery_timer_quirk_check()) {
|
|
xhci->quirks |= XHCI_COMP_MODE_QUIRK;
|
|
compliance_mode_recovery_timer_init(xhci);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
|
|
#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
|
|
static void xhci_event_ring_work(unsigned long arg)
|
|
{
|
|
unsigned long flags;
|
|
int temp;
|
|
u64 temp_64;
|
|
struct xhci_hcd *xhci = (struct xhci_hcd *) arg;
|
|
int i, j;
|
|
|
|
xhci_dbg(xhci, "Poll event ring: %lu\n", jiffies);
|
|
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
temp = xhci_readl(xhci, &xhci->op_regs->status);
|
|
xhci_dbg(xhci, "op reg status = 0x%x\n", temp);
|
|
if (temp == 0xffffffff || (xhci->xhc_state & XHCI_STATE_DYING) ||
|
|
(xhci->xhc_state & XHCI_STATE_HALTED)) {
|
|
xhci_dbg(xhci, "HW died, polling stopped.\n");
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
return;
|
|
}
|
|
|
|
temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
|
|
xhci_dbg(xhci, "ir_set 0 pending = 0x%x\n", temp);
|
|
xhci_dbg(xhci, "HC error bitmask = 0x%x\n", xhci->error_bitmask);
|
|
xhci->error_bitmask = 0;
|
|
xhci_dbg(xhci, "Event ring:\n");
|
|
xhci_debug_segment(xhci, xhci->event_ring->deq_seg);
|
|
xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
|
|
temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
|
|
temp_64 &= ~ERST_PTR_MASK;
|
|
xhci_dbg(xhci, "ERST deq = 64'h%0lx\n", (long unsigned int) temp_64);
|
|
xhci_dbg(xhci, "Command ring:\n");
|
|
xhci_debug_segment(xhci, xhci->cmd_ring->deq_seg);
|
|
xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
|
|
xhci_dbg_cmd_ptrs(xhci);
|
|
for (i = 0; i < MAX_HC_SLOTS; ++i) {
|
|
if (!xhci->devs[i])
|
|
continue;
|
|
for (j = 0; j < 31; ++j) {
|
|
xhci_dbg_ep_rings(xhci, i, j, &xhci->devs[i]->eps[j]);
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
|
|
if (!xhci->zombie)
|
|
mod_timer(&xhci->event_ring_timer, jiffies + POLL_TIMEOUT * HZ);
|
|
else
|
|
xhci_dbg(xhci, "Quit polling the event ring.\n");
|
|
}
|
|
#endif
|
|
|
|
static int xhci_run_finished(struct xhci_hcd *xhci)
|
|
{
|
|
if (xhci_start(xhci)) {
|
|
xhci_halt(xhci);
|
|
return -ENODEV;
|
|
}
|
|
xhci->shared_hcd->state = HC_STATE_RUNNING;
|
|
xhci->cmd_ring_state = CMD_RING_STATE_RUNNING;
|
|
|
|
if (xhci->quirks & XHCI_NEC_HOST)
|
|
xhci_ring_cmd_db(xhci);
|
|
|
|
xhci_dbg(xhci, "Finished xhci_run for USB3 roothub\n");
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Start the HC after it was halted.
|
|
*
|
|
* This function is called by the USB core when the HC driver is added.
|
|
* Its opposite is xhci_stop().
|
|
*
|
|
* xhci_init() must be called once before this function can be called.
|
|
* Reset the HC, enable device slot contexts, program DCBAAP, and
|
|
* set command ring pointer and event ring pointer.
|
|
*
|
|
* Setup MSI-X vectors and enable interrupts.
|
|
*/
|
|
int xhci_run(struct usb_hcd *hcd)
|
|
{
|
|
u32 temp;
|
|
u64 temp_64;
|
|
int ret;
|
|
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
|
|
|
|
/* Start the xHCI host controller running only after the USB 2.0 roothub
|
|
* is setup.
|
|
*/
|
|
|
|
hcd->uses_new_polling = 1;
|
|
if (!usb_hcd_is_primary_hcd(hcd))
|
|
return xhci_run_finished(xhci);
|
|
|
|
xhci_dbg(xhci, "xhci_run\n");
|
|
|
|
ret = xhci_try_enable_msi(hcd);
|
|
if (ret)
|
|
return ret;
|
|
|
|
#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
|
|
init_timer(&xhci->event_ring_timer);
|
|
xhci->event_ring_timer.data = (unsigned long) xhci;
|
|
xhci->event_ring_timer.function = xhci_event_ring_work;
|
|
/* Poll the event ring */
|
|
xhci->event_ring_timer.expires = jiffies + POLL_TIMEOUT * HZ;
|
|
xhci->zombie = 0;
|
|
xhci_dbg(xhci, "Setting event ring polling timer\n");
|
|
add_timer(&xhci->event_ring_timer);
|
|
#endif
|
|
|
|
xhci_dbg(xhci, "Command ring memory map follows:\n");
|
|
xhci_debug_ring(xhci, xhci->cmd_ring);
|
|
xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
|
|
xhci_dbg_cmd_ptrs(xhci);
|
|
|
|
xhci_dbg(xhci, "ERST memory map follows:\n");
|
|
xhci_dbg_erst(xhci, &xhci->erst);
|
|
xhci_dbg(xhci, "Event ring:\n");
|
|
xhci_debug_ring(xhci, xhci->event_ring);
|
|
xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
|
|
temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
|
|
temp_64 &= ~ERST_PTR_MASK;
|
|
xhci_dbg(xhci, "ERST deq = 64'h%0lx\n", (long unsigned int) temp_64);
|
|
|
|
xhci_dbg(xhci, "// Set the interrupt modulation register\n");
|
|
temp = xhci_readl(xhci, &xhci->ir_set->irq_control);
|
|
temp &= ~ER_IRQ_INTERVAL_MASK;
|
|
temp |= (u32) 160;
|
|
xhci_writel(xhci, temp, &xhci->ir_set->irq_control);
|
|
|
|
/* Set the HCD state before we enable the irqs */
|
|
temp = xhci_readl(xhci, &xhci->op_regs->command);
|
|
temp |= (CMD_EIE);
|
|
xhci_dbg(xhci, "// Enable interrupts, cmd = 0x%x.\n",
|
|
temp);
|
|
xhci_writel(xhci, temp, &xhci->op_regs->command);
|
|
|
|
temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
|
|
xhci_dbg(xhci, "// Enabling event ring interrupter %p by writing 0x%x to irq_pending\n",
|
|
xhci->ir_set, (unsigned int) ER_IRQ_ENABLE(temp));
|
|
xhci_writel(xhci, ER_IRQ_ENABLE(temp),
|
|
&xhci->ir_set->irq_pending);
|
|
xhci_print_ir_set(xhci, 0);
|
|
|
|
if (xhci->quirks & XHCI_NEC_HOST)
|
|
xhci_queue_vendor_command(xhci, 0, 0, 0,
|
|
TRB_TYPE(TRB_NEC_GET_FW));
|
|
|
|
xhci_dbg(xhci, "Finished xhci_run for USB2 roothub\n");
|
|
return 0;
|
|
}
|
|
|
|
static void xhci_only_stop_hcd(struct usb_hcd *hcd)
|
|
{
|
|
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
|
|
|
|
spin_lock_irq(&xhci->lock);
|
|
xhci_halt(xhci);
|
|
|
|
/* The shared_hcd is going to be deallocated shortly (the USB core only
|
|
* calls this function when allocation fails in usb_add_hcd(), or
|
|
* usb_remove_hcd() is called). So we need to unset xHCI's pointer.
|
|
*/
|
|
xhci->shared_hcd = NULL;
|
|
spin_unlock_irq(&xhci->lock);
|
|
}
|
|
|
|
/*
|
|
* Stop xHCI driver.
|
|
*
|
|
* This function is called by the USB core when the HC driver is removed.
|
|
* Its opposite is xhci_run().
|
|
*
|
|
* Disable device contexts, disable IRQs, and quiesce the HC.
|
|
* Reset the HC, finish any completed transactions, and cleanup memory.
|
|
*/
|
|
void xhci_stop(struct usb_hcd *hcd)
|
|
{
|
|
u32 temp;
|
|
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
|
|
|
|
if (!usb_hcd_is_primary_hcd(hcd)) {
|
|
xhci_only_stop_hcd(xhci->shared_hcd);
|
|
return;
|
|
}
|
|
|
|
spin_lock_irq(&xhci->lock);
|
|
/* Make sure the xHC is halted for a USB3 roothub
|
|
* (xhci_stop() could be called as part of failed init).
|
|
*/
|
|
xhci_halt(xhci);
|
|
xhci_reset(xhci);
|
|
spin_unlock_irq(&xhci->lock);
|
|
|
|
xhci_cleanup_msix(xhci);
|
|
|
|
#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
|
|
/* Tell the event ring poll function not to reschedule */
|
|
xhci->zombie = 1;
|
|
del_timer_sync(&xhci->event_ring_timer);
|
|
#endif
|
|
|
|
/* Deleting Compliance Mode Recovery Timer */
|
|
if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) &&
|
|
(!(xhci_all_ports_seen_u0(xhci))))
|
|
del_timer_sync(&xhci->comp_mode_recovery_timer);
|
|
|
|
if (xhci->quirks & XHCI_AMD_PLL_FIX)
|
|
usb_amd_dev_put();
|
|
|
|
xhci_dbg(xhci, "// Disabling event ring interrupts\n");
|
|
temp = xhci_readl(xhci, &xhci->op_regs->status);
|
|
xhci_writel(xhci, temp & ~STS_EINT, &xhci->op_regs->status);
|
|
temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
|
|
xhci_writel(xhci, ER_IRQ_DISABLE(temp),
|
|
&xhci->ir_set->irq_pending);
|
|
xhci_print_ir_set(xhci, 0);
|
|
|
|
xhci_dbg(xhci, "cleaning up memory\n");
|
|
xhci_mem_cleanup(xhci);
|
|
xhci_dbg(xhci, "xhci_stop completed - status = %x\n",
|
|
xhci_readl(xhci, &xhci->op_regs->status));
|
|
}
|
|
|
|
/*
|
|
* Shutdown HC (not bus-specific)
|
|
*
|
|
* This is called when the machine is rebooting or halting. We assume that the
|
|
* machine will be powered off, and the HC's internal state will be reset.
|
|
* Don't bother to free memory.
|
|
*
|
|
* This will only ever be called with the main usb_hcd (the USB3 roothub).
|
|
*/
|
|
void xhci_shutdown(struct usb_hcd *hcd)
|
|
{
|
|
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
|
|
|
|
if (xhci->quirks & XHCI_SPURIOUS_REBOOT)
|
|
usb_disable_xhci_ports(to_pci_dev(hcd->self.controller));
|
|
|
|
spin_lock_irq(&xhci->lock);
|
|
xhci_halt(xhci);
|
|
spin_unlock_irq(&xhci->lock);
|
|
|
|
xhci_cleanup_msix(xhci);
|
|
|
|
xhci_dbg(xhci, "xhci_shutdown completed - status = %x\n",
|
|
xhci_readl(xhci, &xhci->op_regs->status));
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static void xhci_save_registers(struct xhci_hcd *xhci)
|
|
{
|
|
xhci->s3.command = xhci_readl(xhci, &xhci->op_regs->command);
|
|
xhci->s3.dev_nt = xhci_readl(xhci, &xhci->op_regs->dev_notification);
|
|
xhci->s3.dcbaa_ptr = xhci_read_64(xhci, &xhci->op_regs->dcbaa_ptr);
|
|
xhci->s3.config_reg = xhci_readl(xhci, &xhci->op_regs->config_reg);
|
|
xhci->s3.erst_size = xhci_readl(xhci, &xhci->ir_set->erst_size);
|
|
xhci->s3.erst_base = xhci_read_64(xhci, &xhci->ir_set->erst_base);
|
|
xhci->s3.erst_dequeue = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
|
|
xhci->s3.irq_pending = xhci_readl(xhci, &xhci->ir_set->irq_pending);
|
|
xhci->s3.irq_control = xhci_readl(xhci, &xhci->ir_set->irq_control);
|
|
}
|
|
|
|
static void xhci_restore_registers(struct xhci_hcd *xhci)
|
|
{
|
|
xhci_writel(xhci, xhci->s3.command, &xhci->op_regs->command);
|
|
xhci_writel(xhci, xhci->s3.dev_nt, &xhci->op_regs->dev_notification);
|
|
xhci_write_64(xhci, xhci->s3.dcbaa_ptr, &xhci->op_regs->dcbaa_ptr);
|
|
xhci_writel(xhci, xhci->s3.config_reg, &xhci->op_regs->config_reg);
|
|
xhci_writel(xhci, xhci->s3.erst_size, &xhci->ir_set->erst_size);
|
|
xhci_write_64(xhci, xhci->s3.erst_base, &xhci->ir_set->erst_base);
|
|
xhci_write_64(xhci, xhci->s3.erst_dequeue, &xhci->ir_set->erst_dequeue);
|
|
xhci_writel(xhci, xhci->s3.irq_pending, &xhci->ir_set->irq_pending);
|
|
xhci_writel(xhci, xhci->s3.irq_control, &xhci->ir_set->irq_control);
|
|
}
|
|
|
|
static void xhci_set_cmd_ring_deq(struct xhci_hcd *xhci)
|
|
{
|
|
u64 val_64;
|
|
|
|
/* step 2: initialize command ring buffer */
|
|
val_64 = xhci_read_64(xhci, &xhci->op_regs->cmd_ring);
|
|
val_64 = (val_64 & (u64) CMD_RING_RSVD_BITS) |
|
|
(xhci_trb_virt_to_dma(xhci->cmd_ring->deq_seg,
|
|
xhci->cmd_ring->dequeue) &
|
|
(u64) ~CMD_RING_RSVD_BITS) |
|
|
xhci->cmd_ring->cycle_state;
|
|
xhci_dbg(xhci, "// Setting command ring address to 0x%llx\n",
|
|
(long unsigned long) val_64);
|
|
xhci_write_64(xhci, val_64, &xhci->op_regs->cmd_ring);
|
|
}
|
|
|
|
/*
|
|
* The whole command ring must be cleared to zero when we suspend the host.
|
|
*
|
|
* The host doesn't save the command ring pointer in the suspend well, so we
|
|
* need to re-program it on resume. Unfortunately, the pointer must be 64-byte
|
|
* aligned, because of the reserved bits in the command ring dequeue pointer
|
|
* register. Therefore, we can't just set the dequeue pointer back in the
|
|
* middle of the ring (TRBs are 16-byte aligned).
|
|
*/
|
|
static void xhci_clear_command_ring(struct xhci_hcd *xhci)
|
|
{
|
|
struct xhci_ring *ring;
|
|
struct xhci_segment *seg;
|
|
|
|
ring = xhci->cmd_ring;
|
|
seg = ring->deq_seg;
|
|
do {
|
|
memset(seg->trbs, 0,
|
|
sizeof(union xhci_trb) * (TRBS_PER_SEGMENT - 1));
|
|
seg->trbs[TRBS_PER_SEGMENT - 1].link.control &=
|
|
cpu_to_le32(~TRB_CYCLE);
|
|
seg = seg->next;
|
|
} while (seg != ring->deq_seg);
|
|
|
|
/* Reset the software enqueue and dequeue pointers */
|
|
ring->deq_seg = ring->first_seg;
|
|
ring->dequeue = ring->first_seg->trbs;
|
|
ring->enq_seg = ring->deq_seg;
|
|
ring->enqueue = ring->dequeue;
|
|
|
|
ring->num_trbs_free = ring->num_segs * (TRBS_PER_SEGMENT - 1) - 1;
|
|
/*
|
|
* Ring is now zeroed, so the HW should look for change of ownership
|
|
* when the cycle bit is set to 1.
|
|
*/
|
|
ring->cycle_state = 1;
|
|
|
|
/*
|
|
* Reset the hardware dequeue pointer.
|
|
* Yes, this will need to be re-written after resume, but we're paranoid
|
|
* and want to make sure the hardware doesn't access bogus memory
|
|
* because, say, the BIOS or an SMI started the host without changing
|
|
* the command ring pointers.
|
|
*/
|
|
xhci_set_cmd_ring_deq(xhci);
|
|
}
|
|
|
|
/*
|
|
* Stop HC (not bus-specific)
|
|
*
|
|
* This is called when the machine transition into S3/S4 mode.
|
|
*
|
|
*/
|
|
int xhci_suspend(struct xhci_hcd *xhci)
|
|
{
|
|
int rc = 0;
|
|
struct usb_hcd *hcd = xhci_to_hcd(xhci);
|
|
u32 command;
|
|
|
|
if (hcd->state != HC_STATE_SUSPENDED ||
|
|
xhci->shared_hcd->state != HC_STATE_SUSPENDED)
|
|
return -EINVAL;
|
|
|
|
/* Don't poll the roothubs on bus suspend. */
|
|
xhci_dbg(xhci, "%s: stopping port polling.\n", __func__);
|
|
clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
|
|
del_timer_sync(&hcd->rh_timer);
|
|
|
|
spin_lock_irq(&xhci->lock);
|
|
clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
|
|
clear_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags);
|
|
/* step 1: stop endpoint */
|
|
/* skipped assuming that port suspend has done */
|
|
|
|
/* step 2: clear Run/Stop bit */
|
|
command = xhci_readl(xhci, &xhci->op_regs->command);
|
|
command &= ~CMD_RUN;
|
|
xhci_writel(xhci, command, &xhci->op_regs->command);
|
|
if (xhci_handshake(xhci, &xhci->op_regs->status,
|
|
STS_HALT, STS_HALT, XHCI_MAX_HALT_USEC)) {
|
|
xhci_warn(xhci, "WARN: xHC CMD_RUN timeout\n");
|
|
spin_unlock_irq(&xhci->lock);
|
|
return -ETIMEDOUT;
|
|
}
|
|
xhci_clear_command_ring(xhci);
|
|
|
|
/* step 3: save registers */
|
|
xhci_save_registers(xhci);
|
|
|
|
/* step 4: set CSS flag */
|
|
command = xhci_readl(xhci, &xhci->op_regs->command);
|
|
command |= CMD_CSS;
|
|
xhci_writel(xhci, command, &xhci->op_regs->command);
|
|
if (xhci_handshake(xhci, &xhci->op_regs->status,
|
|
STS_SAVE, 0, 10 * 1000)) {
|
|
xhci_warn(xhci, "WARN: xHC save state timeout\n");
|
|
spin_unlock_irq(&xhci->lock);
|
|
return -ETIMEDOUT;
|
|
}
|
|
spin_unlock_irq(&xhci->lock);
|
|
|
|
/*
|
|
* Deleting Compliance Mode Recovery Timer because the xHCI Host
|
|
* is about to be suspended.
|
|
*/
|
|
if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) &&
|
|
(!(xhci_all_ports_seen_u0(xhci)))) {
|
|
del_timer_sync(&xhci->comp_mode_recovery_timer);
|
|
xhci_dbg(xhci, "Compliance Mode Recovery Timer Deleted!\n");
|
|
}
|
|
|
|
/* step 5: remove core well power */
|
|
/* synchronize irq when using MSI-X */
|
|
xhci_msix_sync_irqs(xhci);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* start xHC (not bus-specific)
|
|
*
|
|
* This is called when the machine transition from S3/S4 mode.
|
|
*
|
|
*/
|
|
int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
|
|
{
|
|
u32 command, temp = 0;
|
|
struct usb_hcd *hcd = xhci_to_hcd(xhci);
|
|
struct usb_hcd *secondary_hcd;
|
|
int retval = 0;
|
|
|
|
/* Wait a bit if either of the roothubs need to settle from the
|
|
* transition into bus suspend.
|
|
*/
|
|
if (time_before(jiffies, xhci->bus_state[0].next_statechange) ||
|
|
time_before(jiffies,
|
|
xhci->bus_state[1].next_statechange))
|
|
msleep(100);
|
|
|
|
set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
|
|
set_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags);
|
|
|
|
spin_lock_irq(&xhci->lock);
|
|
if (xhci->quirks & XHCI_RESET_ON_RESUME)
|
|
hibernated = true;
|
|
|
|
if (!hibernated) {
|
|
/* step 1: restore register */
|
|
xhci_restore_registers(xhci);
|
|
/* step 2: initialize command ring buffer */
|
|
xhci_set_cmd_ring_deq(xhci);
|
|
/* step 3: restore state and start state*/
|
|
/* step 3: set CRS flag */
|
|
command = xhci_readl(xhci, &xhci->op_regs->command);
|
|
command |= CMD_CRS;
|
|
xhci_writel(xhci, command, &xhci->op_regs->command);
|
|
if (xhci_handshake(xhci, &xhci->op_regs->status,
|
|
STS_RESTORE, 0, 10 * 1000)) {
|
|
xhci_warn(xhci, "WARN: xHC restore state timeout\n");
|
|
spin_unlock_irq(&xhci->lock);
|
|
return -ETIMEDOUT;
|
|
}
|
|
temp = xhci_readl(xhci, &xhci->op_regs->status);
|
|
}
|
|
|
|
/* If restore operation fails, re-initialize the HC during resume */
|
|
if ((temp & STS_SRE) || hibernated) {
|
|
/* Let the USB core know _both_ roothubs lost power. */
|
|
usb_root_hub_lost_power(xhci->main_hcd->self.root_hub);
|
|
usb_root_hub_lost_power(xhci->shared_hcd->self.root_hub);
|
|
|
|
xhci_dbg(xhci, "Stop HCD\n");
|
|
xhci_halt(xhci);
|
|
xhci_reset(xhci);
|
|
spin_unlock_irq(&xhci->lock);
|
|
xhci_cleanup_msix(xhci);
|
|
|
|
#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
|
|
/* Tell the event ring poll function not to reschedule */
|
|
xhci->zombie = 1;
|
|
del_timer_sync(&xhci->event_ring_timer);
|
|
#endif
|
|
|
|
xhci_dbg(xhci, "// Disabling event ring interrupts\n");
|
|
temp = xhci_readl(xhci, &xhci->op_regs->status);
|
|
xhci_writel(xhci, temp & ~STS_EINT, &xhci->op_regs->status);
|
|
temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
|
|
xhci_writel(xhci, ER_IRQ_DISABLE(temp),
|
|
&xhci->ir_set->irq_pending);
|
|
xhci_print_ir_set(xhci, 0);
|
|
|
|
xhci_dbg(xhci, "cleaning up memory\n");
|
|
xhci_mem_cleanup(xhci);
|
|
xhci_dbg(xhci, "xhci_stop completed - status = %x\n",
|
|
xhci_readl(xhci, &xhci->op_regs->status));
|
|
|
|
/* USB core calls the PCI reinit and start functions twice:
|
|
* first with the primary HCD, and then with the secondary HCD.
|
|
* If we don't do the same, the host will never be started.
|
|
*/
|
|
if (!usb_hcd_is_primary_hcd(hcd))
|
|
secondary_hcd = hcd;
|
|
else
|
|
secondary_hcd = xhci->shared_hcd;
|
|
|
|
xhci_dbg(xhci, "Initialize the xhci_hcd\n");
|
|
retval = xhci_init(hcd->primary_hcd);
|
|
if (retval)
|
|
return retval;
|
|
xhci_dbg(xhci, "Start the primary HCD\n");
|
|
retval = xhci_run(hcd->primary_hcd);
|
|
if (!retval) {
|
|
xhci_dbg(xhci, "Start the secondary HCD\n");
|
|
retval = xhci_run(secondary_hcd);
|
|
}
|
|
hcd->state = HC_STATE_SUSPENDED;
|
|
xhci->shared_hcd->state = HC_STATE_SUSPENDED;
|
|
goto done;
|
|
}
|
|
|
|
/* step 4: set Run/Stop bit */
|
|
command = xhci_readl(xhci, &xhci->op_regs->command);
|
|
command |= CMD_RUN;
|
|
xhci_writel(xhci, command, &xhci->op_regs->command);
|
|
xhci_handshake(xhci, &xhci->op_regs->status, STS_HALT,
|
|
0, 250 * 1000);
|
|
|
|
/* step 5: walk topology and initialize portsc,
|
|
* portpmsc and portli
|
|
*/
|
|
/* this is done in bus_resume */
|
|
|
|
/* step 6: restart each of the previously
|
|
* Running endpoints by ringing their doorbells
|
|
*/
|
|
|
|
spin_unlock_irq(&xhci->lock);
|
|
|
|
done:
|
|
if (retval == 0) {
|
|
usb_hcd_resume_root_hub(hcd);
|
|
usb_hcd_resume_root_hub(xhci->shared_hcd);
|
|
}
|
|
|
|
/*
|
|
* If system is subject to the Quirk, Compliance Mode Timer needs to
|
|
* be re-initialized Always after a system resume. Ports are subject
|
|
* to suffer the Compliance Mode issue again. It doesn't matter if
|
|
* ports have entered previously to U0 before system's suspension.
|
|
*/
|
|
if (xhci->quirks & XHCI_COMP_MODE_QUIRK)
|
|
compliance_mode_recovery_timer_init(xhci);
|
|
|
|
/* Re-enable port polling. */
|
|
xhci_dbg(xhci, "%s: starting port polling.\n", __func__);
|
|
set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
|
|
usb_hcd_poll_rh_status(hcd);
|
|
|
|
return retval;
|
|
}
|
|
#endif /* CONFIG_PM */
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* xhci_get_endpoint_index - Used for passing endpoint bitmasks between the core and
|
|
* HCDs. Find the index for an endpoint given its descriptor. Use the return
|
|
* value to right shift 1 for the bitmask.
|
|
*
|
|
* Index = (epnum * 2) + direction - 1,
|
|
* where direction = 0 for OUT, 1 for IN.
|
|
* For control endpoints, the IN index is used (OUT index is unused), so
|
|
* index = (epnum * 2) + direction - 1 = (epnum * 2) + 1 - 1 = (epnum * 2)
|
|
*/
|
|
unsigned int xhci_get_endpoint_index(struct usb_endpoint_descriptor *desc)
|
|
{
|
|
unsigned int index;
|
|
if (usb_endpoint_xfer_control(desc))
|
|
index = (unsigned int) (usb_endpoint_num(desc)*2);
|
|
else
|
|
index = (unsigned int) (usb_endpoint_num(desc)*2) +
|
|
(usb_endpoint_dir_in(desc) ? 1 : 0) - 1;
|
|
return index;
|
|
}
|
|
|
|
/* Find the flag for this endpoint (for use in the control context). Use the
|
|
* endpoint index to create a bitmask. The slot context is bit 0, endpoint 0 is
|
|
* bit 1, etc.
|
|
*/
|
|
unsigned int xhci_get_endpoint_flag(struct usb_endpoint_descriptor *desc)
|
|
{
|
|
return 1 << (xhci_get_endpoint_index(desc) + 1);
|
|
}
|
|
|
|
/* Find the flag for this endpoint (for use in the control context). Use the
|
|
* endpoint index to create a bitmask. The slot context is bit 0, endpoint 0 is
|
|
* bit 1, etc.
|
|
*/
|
|
unsigned int xhci_get_endpoint_flag_from_index(unsigned int ep_index)
|
|
{
|
|
return 1 << (ep_index + 1);
|
|
}
|
|
|
|
/* Compute the last valid endpoint context index. Basically, this is the
|
|
* endpoint index plus one. For slot contexts with more than valid endpoint,
|
|
* we find the most significant bit set in the added contexts flags.
|
|
* e.g. ep 1 IN (with epnum 0x81) => added_ctxs = 0b1000
|
|
* fls(0b1000) = 4, but the endpoint context index is 3, so subtract one.
|
|
*/
|
|
unsigned int xhci_last_valid_endpoint(u32 added_ctxs)
|
|
{
|
|
return fls(added_ctxs) - 1;
|
|
}
|
|
|
|
/* Returns 1 if the arguments are OK;
|
|
* returns 0 this is a root hub; returns -EINVAL for NULL pointers.
|
|
*/
|
|
static int xhci_check_args(struct usb_hcd *hcd, struct usb_device *udev,
|
|
struct usb_host_endpoint *ep, int check_ep, bool check_virt_dev,
|
|
const char *func) {
|
|
struct xhci_hcd *xhci;
|
|
struct xhci_virt_device *virt_dev;
|
|
|
|
if (!hcd || (check_ep && !ep) || !udev) {
|
|
printk(KERN_DEBUG "xHCI %s called with invalid args\n",
|
|
func);
|
|
return -EINVAL;
|
|
}
|
|
if (!udev->parent) {
|
|
printk(KERN_DEBUG "xHCI %s called for root hub\n",
|
|
func);
|
|
return 0;
|
|
}
|
|
|
|
xhci = hcd_to_xhci(hcd);
|
|
if (xhci->xhc_state & XHCI_STATE_HALTED)
|
|
return -ENODEV;
|
|
|
|
if (check_virt_dev) {
|
|
if (!udev->slot_id || !xhci->devs[udev->slot_id]) {
|
|
printk(KERN_DEBUG "xHCI %s called with unaddressed "
|
|
"device\n", func);
|
|
return -EINVAL;
|
|
}
|
|
|
|
virt_dev = xhci->devs[udev->slot_id];
|
|
if (virt_dev->udev != udev) {
|
|
printk(KERN_DEBUG "xHCI %s called with udev and "
|
|
"virt_dev does not match\n", func);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int xhci_configure_endpoint(struct xhci_hcd *xhci,
|
|
struct usb_device *udev, struct xhci_command *command,
|
|
bool ctx_change, bool must_succeed);
|
|
|
|
/*
|
|
* Full speed devices may have a max packet size greater than 8 bytes, but the
|
|
* USB core doesn't know that until it reads the first 8 bytes of the
|
|
* descriptor. If the usb_device's max packet size changes after that point,
|
|
* we need to issue an evaluate context command and wait on it.
|
|
*/
|
|
static int xhci_check_maxpacket(struct xhci_hcd *xhci, unsigned int slot_id,
|
|
unsigned int ep_index, struct urb *urb)
|
|
{
|
|
struct xhci_container_ctx *in_ctx;
|
|
struct xhci_container_ctx *out_ctx;
|
|
struct xhci_input_control_ctx *ctrl_ctx;
|
|
struct xhci_ep_ctx *ep_ctx;
|
|
int max_packet_size;
|
|
int hw_max_packet_size;
|
|
int ret = 0;
|
|
|
|
out_ctx = xhci->devs[slot_id]->out_ctx;
|
|
ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
|
|
hw_max_packet_size = MAX_PACKET_DECODED(le32_to_cpu(ep_ctx->ep_info2));
|
|
max_packet_size = usb_endpoint_maxp(&urb->dev->ep0.desc);
|
|
if (hw_max_packet_size != max_packet_size) {
|
|
xhci_dbg(xhci, "Max Packet Size for ep 0 changed.\n");
|
|
xhci_dbg(xhci, "Max packet size in usb_device = %d\n",
|
|
max_packet_size);
|
|
xhci_dbg(xhci, "Max packet size in xHCI HW = %d\n",
|
|
hw_max_packet_size);
|
|
xhci_dbg(xhci, "Issuing evaluate context command.\n");
|
|
|
|
/* Set up the modified control endpoint 0 */
|
|
xhci_endpoint_copy(xhci, xhci->devs[slot_id]->in_ctx,
|
|
xhci->devs[slot_id]->out_ctx, ep_index);
|
|
in_ctx = xhci->devs[slot_id]->in_ctx;
|
|
ep_ctx = xhci_get_ep_ctx(xhci, in_ctx, ep_index);
|
|
ep_ctx->ep_info2 &= cpu_to_le32(~MAX_PACKET_MASK);
|
|
ep_ctx->ep_info2 |= cpu_to_le32(MAX_PACKET(max_packet_size));
|
|
|
|
/* Set up the input context flags for the command */
|
|
/* FIXME: This won't work if a non-default control endpoint
|
|
* changes max packet sizes.
|
|
*/
|
|
ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
|
|
ctrl_ctx->add_flags = cpu_to_le32(EP0_FLAG);
|
|
ctrl_ctx->drop_flags = 0;
|
|
|
|
xhci_dbg(xhci, "Slot %d input context\n", slot_id);
|
|
xhci_dbg_ctx(xhci, in_ctx, ep_index);
|
|
xhci_dbg(xhci, "Slot %d output context\n", slot_id);
|
|
xhci_dbg_ctx(xhci, out_ctx, ep_index);
|
|
|
|
ret = xhci_configure_endpoint(xhci, urb->dev, NULL,
|
|
true, false);
|
|
|
|
/* Clean up the input context for later use by bandwidth
|
|
* functions.
|
|
*/
|
|
ctrl_ctx->add_flags = cpu_to_le32(SLOT_FLAG);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* non-error returns are a promise to giveback() the urb later
|
|
* we drop ownership so next owner (or urb unlink) can get it
|
|
*/
|
|
int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
|
|
{
|
|
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
|
|
struct xhci_td *buffer;
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
unsigned int slot_id, ep_index;
|
|
struct urb_priv *urb_priv;
|
|
int size, i;
|
|
|
|
if (!urb || xhci_check_args(hcd, urb->dev, urb->ep,
|
|
true, true, __func__) <= 0)
|
|
return -EINVAL;
|
|
|
|
slot_id = urb->dev->slot_id;
|
|
ep_index = xhci_get_endpoint_index(&urb->ep->desc);
|
|
|
|
if (!HCD_HW_ACCESSIBLE(hcd)) {
|
|
if (!in_interrupt())
|
|
xhci_dbg(xhci, "urb submitted during PCI suspend\n");
|
|
ret = -ESHUTDOWN;
|
|
goto exit;
|
|
}
|
|
|
|
if (usb_endpoint_xfer_isoc(&urb->ep->desc))
|
|
size = urb->number_of_packets;
|
|
else
|
|
size = 1;
|
|
|
|
urb_priv = kzalloc(sizeof(struct urb_priv) +
|
|
size * sizeof(struct xhci_td *), mem_flags);
|
|
if (!urb_priv)
|
|
return -ENOMEM;
|
|
|
|
buffer = kzalloc(size * sizeof(struct xhci_td), mem_flags);
|
|
if (!buffer) {
|
|
kfree(urb_priv);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
for (i = 0; i < size; i++) {
|
|
urb_priv->td[i] = buffer;
|
|
buffer++;
|
|
}
|
|
|
|
urb_priv->length = size;
|
|
urb_priv->td_cnt = 0;
|
|
urb->hcpriv = urb_priv;
|
|
|
|
if (usb_endpoint_xfer_control(&urb->ep->desc)) {
|
|
/* Check to see if the max packet size for the default control
|
|
* endpoint changed during FS device enumeration
|
|
*/
|
|
if (urb->dev->speed == USB_SPEED_FULL) {
|
|
ret = xhci_check_maxpacket(xhci, slot_id,
|
|
ep_index, urb);
|
|
if (ret < 0) {
|
|
xhci_urb_free_priv(xhci, urb_priv);
|
|
urb->hcpriv = NULL;
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/* We have a spinlock and interrupts disabled, so we must pass
|
|
* atomic context to this function, which may allocate memory.
|
|
*/
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
if (xhci->xhc_state & XHCI_STATE_DYING)
|
|
goto dying;
|
|
ret = xhci_queue_ctrl_tx(xhci, GFP_ATOMIC, urb,
|
|
slot_id, ep_index);
|
|
if (ret)
|
|
goto free_priv;
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
} else if (usb_endpoint_xfer_bulk(&urb->ep->desc)) {
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
if (xhci->xhc_state & XHCI_STATE_DYING)
|
|
goto dying;
|
|
if (xhci->devs[slot_id]->eps[ep_index].ep_state &
|
|
EP_GETTING_STREAMS) {
|
|
xhci_warn(xhci, "WARN: Can't enqueue URB while bulk ep "
|
|
"is transitioning to using streams.\n");
|
|
ret = -EINVAL;
|
|
} else if (xhci->devs[slot_id]->eps[ep_index].ep_state &
|
|
EP_GETTING_NO_STREAMS) {
|
|
xhci_warn(xhci, "WARN: Can't enqueue URB while bulk ep "
|
|
"is transitioning to "
|
|
"not having streams.\n");
|
|
ret = -EINVAL;
|
|
} else {
|
|
ret = xhci_queue_bulk_tx(xhci, GFP_ATOMIC, urb,
|
|
slot_id, ep_index);
|
|
}
|
|
if (ret)
|
|
goto free_priv;
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
} else if (usb_endpoint_xfer_int(&urb->ep->desc)) {
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
if (xhci->xhc_state & XHCI_STATE_DYING)
|
|
goto dying;
|
|
ret = xhci_queue_intr_tx(xhci, GFP_ATOMIC, urb,
|
|
slot_id, ep_index);
|
|
if (ret)
|
|
goto free_priv;
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
} else {
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
if (xhci->xhc_state & XHCI_STATE_DYING)
|
|
goto dying;
|
|
ret = xhci_queue_isoc_tx_prepare(xhci, GFP_ATOMIC, urb,
|
|
slot_id, ep_index);
|
|
if (ret)
|
|
goto free_priv;
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
}
|
|
exit:
|
|
return ret;
|
|
dying:
|
|
xhci_dbg(xhci, "Ep 0x%x: URB %p submitted for "
|
|
"non-responsive xHCI host.\n",
|
|
urb->ep->desc.bEndpointAddress, urb);
|
|
ret = -ESHUTDOWN;
|
|
free_priv:
|
|
xhci_urb_free_priv(xhci, urb_priv);
|
|
urb->hcpriv = NULL;
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
return ret;
|
|
}
|
|
|
|
/* Get the right ring for the given URB.
|
|
* If the endpoint supports streams, boundary check the URB's stream ID.
|
|
* If the endpoint doesn't support streams, return the singular endpoint ring.
|
|
*/
|
|
static struct xhci_ring *xhci_urb_to_transfer_ring(struct xhci_hcd *xhci,
|
|
struct urb *urb)
|
|
{
|
|
unsigned int slot_id;
|
|
unsigned int ep_index;
|
|
unsigned int stream_id;
|
|
struct xhci_virt_ep *ep;
|
|
|
|
slot_id = urb->dev->slot_id;
|
|
ep_index = xhci_get_endpoint_index(&urb->ep->desc);
|
|
stream_id = urb->stream_id;
|
|
ep = &xhci->devs[slot_id]->eps[ep_index];
|
|
/* Common case: no streams */
|
|
if (!(ep->ep_state & EP_HAS_STREAMS))
|
|
return ep->ring;
|
|
|
|
if (stream_id == 0) {
|
|
xhci_warn(xhci,
|
|
"WARN: Slot ID %u, ep index %u has streams, "
|
|
"but URB has no stream ID.\n",
|
|
slot_id, ep_index);
|
|
return NULL;
|
|
}
|
|
|
|
if (stream_id < ep->stream_info->num_streams)
|
|
return ep->stream_info->stream_rings[stream_id];
|
|
|
|
xhci_warn(xhci,
|
|
"WARN: Slot ID %u, ep index %u has "
|
|
"stream IDs 1 to %u allocated, "
|
|
"but stream ID %u is requested.\n",
|
|
slot_id, ep_index,
|
|
ep->stream_info->num_streams - 1,
|
|
stream_id);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Remove the URB's TD from the endpoint ring. This may cause the HC to stop
|
|
* USB transfers, potentially stopping in the middle of a TRB buffer. The HC
|
|
* should pick up where it left off in the TD, unless a Set Transfer Ring
|
|
* Dequeue Pointer is issued.
|
|
*
|
|
* The TRBs that make up the buffers for the canceled URB will be "removed" from
|
|
* the ring. Since the ring is a contiguous structure, they can't be physically
|
|
* removed. Instead, there are two options:
|
|
*
|
|
* 1) If the HC is in the middle of processing the URB to be canceled, we
|
|
* simply move the ring's dequeue pointer past those TRBs using the Set
|
|
* Transfer Ring Dequeue Pointer command. This will be the common case,
|
|
* when drivers timeout on the last submitted URB and attempt to cancel.
|
|
*
|
|
* 2) If the HC is in the middle of a different TD, we turn the TRBs into a
|
|
* series of 1-TRB transfer no-op TDs. (No-ops shouldn't be chained.) The
|
|
* HC will need to invalidate the any TRBs it has cached after the stop
|
|
* endpoint command, as noted in the xHCI 0.95 errata.
|
|
*
|
|
* 3) The TD may have completed by the time the Stop Endpoint Command
|
|
* completes, so software needs to handle that case too.
|
|
*
|
|
* This function should protect against the TD enqueueing code ringing the
|
|
* doorbell while this code is waiting for a Stop Endpoint command to complete.
|
|
* It also needs to account for multiple cancellations on happening at the same
|
|
* time for the same endpoint.
|
|
*
|
|
* Note that this function can be called in any context, or so says
|
|
* usb_hcd_unlink_urb()
|
|
*/
|
|
int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
|
|
{
|
|
unsigned long flags;
|
|
int ret, i;
|
|
u32 temp;
|
|
struct xhci_hcd *xhci;
|
|
struct urb_priv *urb_priv;
|
|
struct xhci_td *td;
|
|
unsigned int ep_index;
|
|
struct xhci_ring *ep_ring;
|
|
struct xhci_virt_ep *ep;
|
|
|
|
xhci = hcd_to_xhci(hcd);
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
/* Make sure the URB hasn't completed or been unlinked already */
|
|
ret = usb_hcd_check_unlink_urb(hcd, urb, status);
|
|
if (ret || !urb->hcpriv)
|
|
goto done;
|
|
temp = xhci_readl(xhci, &xhci->op_regs->status);
|
|
if (temp == 0xffffffff || (xhci->xhc_state & XHCI_STATE_HALTED)) {
|
|
xhci_dbg(xhci, "HW died, freeing TD.\n");
|
|
urb_priv = urb->hcpriv;
|
|
for (i = urb_priv->td_cnt; i < urb_priv->length; i++) {
|
|
td = urb_priv->td[i];
|
|
if (!list_empty(&td->td_list))
|
|
list_del_init(&td->td_list);
|
|
if (!list_empty(&td->cancelled_td_list))
|
|
list_del_init(&td->cancelled_td_list);
|
|
}
|
|
|
|
usb_hcd_unlink_urb_from_ep(hcd, urb);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
usb_hcd_giveback_urb(hcd, urb, -ESHUTDOWN);
|
|
xhci_urb_free_priv(xhci, urb_priv);
|
|
return ret;
|
|
}
|
|
if ((xhci->xhc_state & XHCI_STATE_DYING) ||
|
|
(xhci->xhc_state & XHCI_STATE_HALTED)) {
|
|
xhci_dbg(xhci, "Ep 0x%x: URB %p to be canceled on "
|
|
"non-responsive xHCI host.\n",
|
|
urb->ep->desc.bEndpointAddress, urb);
|
|
/* Let the stop endpoint command watchdog timer (which set this
|
|
* state) finish cleaning up the endpoint TD lists. We must
|
|
* have caught it in the middle of dropping a lock and giving
|
|
* back an URB.
|
|
*/
|
|
goto done;
|
|
}
|
|
|
|
ep_index = xhci_get_endpoint_index(&urb->ep->desc);
|
|
ep = &xhci->devs[urb->dev->slot_id]->eps[ep_index];
|
|
ep_ring = xhci_urb_to_transfer_ring(xhci, urb);
|
|
if (!ep_ring) {
|
|
ret = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
urb_priv = urb->hcpriv;
|
|
i = urb_priv->td_cnt;
|
|
if (i < urb_priv->length)
|
|
xhci_dbg(xhci, "Cancel URB %p, dev %s, ep 0x%x, "
|
|
"starting at offset 0x%llx\n",
|
|
urb, urb->dev->devpath,
|
|
urb->ep->desc.bEndpointAddress,
|
|
(unsigned long long) xhci_trb_virt_to_dma(
|
|
urb_priv->td[i]->start_seg,
|
|
urb_priv->td[i]->first_trb));
|
|
|
|
for (; i < urb_priv->length; i++) {
|
|
td = urb_priv->td[i];
|
|
list_add_tail(&td->cancelled_td_list, &ep->cancelled_td_list);
|
|
}
|
|
|
|
/* Queue a stop endpoint command, but only if this is
|
|
* the first cancellation to be handled.
|
|
*/
|
|
if (!(ep->ep_state & EP_HALT_PENDING)) {
|
|
ep->ep_state |= EP_HALT_PENDING;
|
|
ep->stop_cmds_pending++;
|
|
ep->stop_cmd_timer.expires = jiffies +
|
|
XHCI_STOP_EP_CMD_TIMEOUT * HZ;
|
|
add_timer(&ep->stop_cmd_timer);
|
|
xhci_queue_stop_endpoint(xhci, urb->dev->slot_id, ep_index, 0);
|
|
xhci_ring_cmd_db(xhci);
|
|
}
|
|
done:
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
return ret;
|
|
}
|
|
|
|
/* Drop an endpoint from a new bandwidth configuration for this device.
|
|
* Only one call to this function is allowed per endpoint before
|
|
* check_bandwidth() or reset_bandwidth() must be called.
|
|
* A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will
|
|
* add the endpoint to the schedule with possibly new parameters denoted by a
|
|
* different endpoint descriptor in usb_host_endpoint.
|
|
* A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is
|
|
* not allowed.
|
|
*
|
|
* The USB core will not allow URBs to be queued to an endpoint that is being
|
|
* disabled, so there's no need for mutual exclusion to protect
|
|
* the xhci->devs[slot_id] structure.
|
|
*/
|
|
int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
|
|
struct usb_host_endpoint *ep)
|
|
{
|
|
struct xhci_hcd *xhci;
|
|
struct xhci_container_ctx *in_ctx, *out_ctx;
|
|
struct xhci_input_control_ctx *ctrl_ctx;
|
|
struct xhci_slot_ctx *slot_ctx;
|
|
unsigned int last_ctx;
|
|
unsigned int ep_index;
|
|
struct xhci_ep_ctx *ep_ctx;
|
|
u32 drop_flag;
|
|
u32 new_add_flags, new_drop_flags, new_slot_info;
|
|
int ret;
|
|
|
|
ret = xhci_check_args(hcd, udev, ep, 1, true, __func__);
|
|
if (ret <= 0)
|
|
return ret;
|
|
xhci = hcd_to_xhci(hcd);
|
|
if (xhci->xhc_state & XHCI_STATE_DYING)
|
|
return -ENODEV;
|
|
|
|
xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
|
|
drop_flag = xhci_get_endpoint_flag(&ep->desc);
|
|
if (drop_flag == SLOT_FLAG || drop_flag == EP0_FLAG) {
|
|
xhci_dbg(xhci, "xHCI %s - can't drop slot or ep 0 %#x\n",
|
|
__func__, drop_flag);
|
|
return 0;
|
|
}
|
|
|
|
in_ctx = xhci->devs[udev->slot_id]->in_ctx;
|
|
out_ctx = xhci->devs[udev->slot_id]->out_ctx;
|
|
ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
|
|
ep_index = xhci_get_endpoint_index(&ep->desc);
|
|
ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
|
|
/* If the HC already knows the endpoint is disabled,
|
|
* or the HCD has noted it is disabled, ignore this request
|
|
*/
|
|
if (((ep_ctx->ep_info & cpu_to_le32(EP_STATE_MASK)) ==
|
|
cpu_to_le32(EP_STATE_DISABLED)) ||
|
|
le32_to_cpu(ctrl_ctx->drop_flags) &
|
|
xhci_get_endpoint_flag(&ep->desc)) {
|
|
xhci_warn(xhci, "xHCI %s called with disabled ep %p\n",
|
|
__func__, ep);
|
|
return 0;
|
|
}
|
|
|
|
ctrl_ctx->drop_flags |= cpu_to_le32(drop_flag);
|
|
new_drop_flags = le32_to_cpu(ctrl_ctx->drop_flags);
|
|
|
|
ctrl_ctx->add_flags &= cpu_to_le32(~drop_flag);
|
|
new_add_flags = le32_to_cpu(ctrl_ctx->add_flags);
|
|
|
|
last_ctx = xhci_last_valid_endpoint(le32_to_cpu(ctrl_ctx->add_flags));
|
|
slot_ctx = xhci_get_slot_ctx(xhci, in_ctx);
|
|
/* Update the last valid endpoint context, if we deleted the last one */
|
|
if ((le32_to_cpu(slot_ctx->dev_info) & LAST_CTX_MASK) >
|
|
LAST_CTX(last_ctx)) {
|
|
slot_ctx->dev_info &= cpu_to_le32(~LAST_CTX_MASK);
|
|
slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(last_ctx));
|
|
}
|
|
new_slot_info = le32_to_cpu(slot_ctx->dev_info);
|
|
|
|
xhci_endpoint_zero(xhci, xhci->devs[udev->slot_id], ep);
|
|
|
|
xhci_dbg(xhci, "drop ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n",
|
|
(unsigned int) ep->desc.bEndpointAddress,
|
|
udev->slot_id,
|
|
(unsigned int) new_drop_flags,
|
|
(unsigned int) new_add_flags,
|
|
(unsigned int) new_slot_info);
|
|
return 0;
|
|
}
|
|
|
|
/* Add an endpoint to a new possible bandwidth configuration for this device.
|
|
* Only one call to this function is allowed per endpoint before
|
|
* check_bandwidth() or reset_bandwidth() must be called.
|
|
* A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will
|
|
* add the endpoint to the schedule with possibly new parameters denoted by a
|
|
* different endpoint descriptor in usb_host_endpoint.
|
|
* A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is
|
|
* not allowed.
|
|
*
|
|
* The USB core will not allow URBs to be queued to an endpoint until the
|
|
* configuration or alt setting is installed in the device, so there's no need
|
|
* for mutual exclusion to protect the xhci->devs[slot_id] structure.
|
|
*/
|
|
int xhci_add_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
|
|
struct usb_host_endpoint *ep)
|
|
{
|
|
struct xhci_hcd *xhci;
|
|
struct xhci_container_ctx *in_ctx, *out_ctx;
|
|
unsigned int ep_index;
|
|
struct xhci_slot_ctx *slot_ctx;
|
|
struct xhci_input_control_ctx *ctrl_ctx;
|
|
u32 added_ctxs;
|
|
unsigned int last_ctx;
|
|
u32 new_add_flags, new_drop_flags, new_slot_info;
|
|
struct xhci_virt_device *virt_dev;
|
|
int ret = 0;
|
|
|
|
ret = xhci_check_args(hcd, udev, ep, 1, true, __func__);
|
|
if (ret <= 0) {
|
|
/* So we won't queue a reset ep command for a root hub */
|
|
ep->hcpriv = NULL;
|
|
return ret;
|
|
}
|
|
xhci = hcd_to_xhci(hcd);
|
|
if (xhci->xhc_state & XHCI_STATE_DYING)
|
|
return -ENODEV;
|
|
|
|
added_ctxs = xhci_get_endpoint_flag(&ep->desc);
|
|
last_ctx = xhci_last_valid_endpoint(added_ctxs);
|
|
if (added_ctxs == SLOT_FLAG || added_ctxs == EP0_FLAG) {
|
|
/* FIXME when we have to issue an evaluate endpoint command to
|
|
* deal with ep0 max packet size changing once we get the
|
|
* descriptors
|
|
*/
|
|
xhci_dbg(xhci, "xHCI %s - can't add slot or ep 0 %#x\n",
|
|
__func__, added_ctxs);
|
|
return 0;
|
|
}
|
|
|
|
virt_dev = xhci->devs[udev->slot_id];
|
|
in_ctx = virt_dev->in_ctx;
|
|
out_ctx = virt_dev->out_ctx;
|
|
ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
|
|
ep_index = xhci_get_endpoint_index(&ep->desc);
|
|
|
|
/* If this endpoint is already in use, and the upper layers are trying
|
|
* to add it again without dropping it, reject the addition.
|
|
*/
|
|
if (virt_dev->eps[ep_index].ring &&
|
|
!(le32_to_cpu(ctrl_ctx->drop_flags) &
|
|
xhci_get_endpoint_flag(&ep->desc))) {
|
|
xhci_warn(xhci, "Trying to add endpoint 0x%x "
|
|
"without dropping it.\n",
|
|
(unsigned int) ep->desc.bEndpointAddress);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* If the HCD has already noted the endpoint is enabled,
|
|
* ignore this request.
|
|
*/
|
|
if (le32_to_cpu(ctrl_ctx->add_flags) &
|
|
xhci_get_endpoint_flag(&ep->desc)) {
|
|
xhci_warn(xhci, "xHCI %s called with enabled ep %p\n",
|
|
__func__, ep);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Configuration and alternate setting changes must be done in
|
|
* process context, not interrupt context (or so documenation
|
|
* for usb_set_interface() and usb_set_configuration() claim).
|
|
*/
|
|
if (xhci_endpoint_init(xhci, virt_dev, udev, ep, GFP_NOIO) < 0) {
|
|
dev_dbg(&udev->dev, "%s - could not initialize ep %#x\n",
|
|
__func__, ep->desc.bEndpointAddress);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ctrl_ctx->add_flags |= cpu_to_le32(added_ctxs);
|
|
new_add_flags = le32_to_cpu(ctrl_ctx->add_flags);
|
|
|
|
/* If xhci_endpoint_disable() was called for this endpoint, but the
|
|
* xHC hasn't been notified yet through the check_bandwidth() call,
|
|
* this re-adds a new state for the endpoint from the new endpoint
|
|
* descriptors. We must drop and re-add this endpoint, so we leave the
|
|
* drop flags alone.
|
|
*/
|
|
new_drop_flags = le32_to_cpu(ctrl_ctx->drop_flags);
|
|
|
|
slot_ctx = xhci_get_slot_ctx(xhci, in_ctx);
|
|
/* Update the last valid endpoint context, if we just added one past */
|
|
if ((le32_to_cpu(slot_ctx->dev_info) & LAST_CTX_MASK) <
|
|
LAST_CTX(last_ctx)) {
|
|
slot_ctx->dev_info &= cpu_to_le32(~LAST_CTX_MASK);
|
|
slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(last_ctx));
|
|
}
|
|
new_slot_info = le32_to_cpu(slot_ctx->dev_info);
|
|
|
|
/* Store the usb_device pointer for later use */
|
|
ep->hcpriv = udev;
|
|
|
|
xhci_dbg(xhci, "add ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n",
|
|
(unsigned int) ep->desc.bEndpointAddress,
|
|
udev->slot_id,
|
|
(unsigned int) new_drop_flags,
|
|
(unsigned int) new_add_flags,
|
|
(unsigned int) new_slot_info);
|
|
return 0;
|
|
}
|
|
|
|
static void xhci_zero_in_ctx(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev)
|
|
{
|
|
struct xhci_input_control_ctx *ctrl_ctx;
|
|
struct xhci_ep_ctx *ep_ctx;
|
|
struct xhci_slot_ctx *slot_ctx;
|
|
int i;
|
|
|
|
/* When a device's add flag and drop flag are zero, any subsequent
|
|
* configure endpoint command will leave that endpoint's state
|
|
* untouched. Make sure we don't leave any old state in the input
|
|
* endpoint contexts.
|
|
*/
|
|
ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
|
|
ctrl_ctx->drop_flags = 0;
|
|
ctrl_ctx->add_flags = 0;
|
|
slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
|
|
slot_ctx->dev_info &= cpu_to_le32(~LAST_CTX_MASK);
|
|
/* Endpoint 0 is always valid */
|
|
slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(1));
|
|
for (i = 1; i < 31; ++i) {
|
|
ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, i);
|
|
ep_ctx->ep_info = 0;
|
|
ep_ctx->ep_info2 = 0;
|
|
ep_ctx->deq = 0;
|
|
ep_ctx->tx_info = 0;
|
|
}
|
|
}
|
|
|
|
static int xhci_configure_endpoint_result(struct xhci_hcd *xhci,
|
|
struct usb_device *udev, u32 *cmd_status)
|
|
{
|
|
int ret;
|
|
|
|
switch (*cmd_status) {
|
|
case COMP_ENOMEM:
|
|
dev_warn(&udev->dev, "Not enough host controller resources "
|
|
"for new device state.\n");
|
|
ret = -ENOMEM;
|
|
/* FIXME: can we allocate more resources for the HC? */
|
|
break;
|
|
case COMP_BW_ERR:
|
|
case COMP_2ND_BW_ERR:
|
|
dev_warn(&udev->dev, "Not enough bandwidth "
|
|
"for new device state.\n");
|
|
ret = -ENOSPC;
|
|
/* FIXME: can we go back to the old state? */
|
|
break;
|
|
case COMP_TRB_ERR:
|
|
/* the HCD set up something wrong */
|
|
dev_warn(&udev->dev, "ERROR: Endpoint drop flag = 0, "
|
|
"add flag = 1, "
|
|
"and endpoint is not disabled.\n");
|
|
ret = -EINVAL;
|
|
break;
|
|
case COMP_DEV_ERR:
|
|
dev_warn(&udev->dev, "ERROR: Incompatible device for endpoint "
|
|
"configure command.\n");
|
|
ret = -ENODEV;
|
|
break;
|
|
case COMP_SUCCESS:
|
|
dev_dbg(&udev->dev, "Successful Endpoint Configure command\n");
|
|
ret = 0;
|
|
break;
|
|
default:
|
|
xhci_err(xhci, "ERROR: unexpected command completion "
|
|
"code 0x%x.\n", *cmd_status);
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int xhci_evaluate_context_result(struct xhci_hcd *xhci,
|
|
struct usb_device *udev, u32 *cmd_status)
|
|
{
|
|
int ret;
|
|
struct xhci_virt_device *virt_dev = xhci->devs[udev->slot_id];
|
|
|
|
switch (*cmd_status) {
|
|
case COMP_EINVAL:
|
|
dev_warn(&udev->dev, "WARN: xHCI driver setup invalid evaluate "
|
|
"context command.\n");
|
|
ret = -EINVAL;
|
|
break;
|
|
case COMP_EBADSLT:
|
|
dev_warn(&udev->dev, "WARN: slot not enabled for"
|
|
"evaluate context command.\n");
|
|
ret = -EINVAL;
|
|
break;
|
|
case COMP_CTX_STATE:
|
|
dev_warn(&udev->dev, "WARN: invalid context state for "
|
|
"evaluate context command.\n");
|
|
xhci_dbg_ctx(xhci, virt_dev->out_ctx, 1);
|
|
ret = -EINVAL;
|
|
break;
|
|
case COMP_DEV_ERR:
|
|
dev_warn(&udev->dev, "ERROR: Incompatible device for evaluate "
|
|
"context command.\n");
|
|
ret = -ENODEV;
|
|
break;
|
|
case COMP_MEL_ERR:
|
|
/* Max Exit Latency too large error */
|
|
dev_warn(&udev->dev, "WARN: Max Exit Latency too large\n");
|
|
ret = -EINVAL;
|
|
break;
|
|
case COMP_SUCCESS:
|
|
dev_dbg(&udev->dev, "Successful evaluate context command\n");
|
|
ret = 0;
|
|
break;
|
|
default:
|
|
xhci_err(xhci, "ERROR: unexpected command completion "
|
|
"code 0x%x.\n", *cmd_status);
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static u32 xhci_count_num_new_endpoints(struct xhci_hcd *xhci,
|
|
struct xhci_container_ctx *in_ctx)
|
|
{
|
|
struct xhci_input_control_ctx *ctrl_ctx;
|
|
u32 valid_add_flags;
|
|
u32 valid_drop_flags;
|
|
|
|
ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
|
|
/* Ignore the slot flag (bit 0), and the default control endpoint flag
|
|
* (bit 1). The default control endpoint is added during the Address
|
|
* Device command and is never removed until the slot is disabled.
|
|
*/
|
|
valid_add_flags = ctrl_ctx->add_flags >> 2;
|
|
valid_drop_flags = ctrl_ctx->drop_flags >> 2;
|
|
|
|
/* Use hweight32 to count the number of ones in the add flags, or
|
|
* number of endpoints added. Don't count endpoints that are changed
|
|
* (both added and dropped).
|
|
*/
|
|
return hweight32(valid_add_flags) -
|
|
hweight32(valid_add_flags & valid_drop_flags);
|
|
}
|
|
|
|
static unsigned int xhci_count_num_dropped_endpoints(struct xhci_hcd *xhci,
|
|
struct xhci_container_ctx *in_ctx)
|
|
{
|
|
struct xhci_input_control_ctx *ctrl_ctx;
|
|
u32 valid_add_flags;
|
|
u32 valid_drop_flags;
|
|
|
|
ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
|
|
valid_add_flags = ctrl_ctx->add_flags >> 2;
|
|
valid_drop_flags = ctrl_ctx->drop_flags >> 2;
|
|
|
|
return hweight32(valid_drop_flags) -
|
|
hweight32(valid_add_flags & valid_drop_flags);
|
|
}
|
|
|
|
/*
|
|
* We need to reserve the new number of endpoints before the configure endpoint
|
|
* command completes. We can't subtract the dropped endpoints from the number
|
|
* of active endpoints until the command completes because we can oversubscribe
|
|
* the host in this case:
|
|
*
|
|
* - the first configure endpoint command drops more endpoints than it adds
|
|
* - a second configure endpoint command that adds more endpoints is queued
|
|
* - the first configure endpoint command fails, so the config is unchanged
|
|
* - the second command may succeed, even though there isn't enough resources
|
|
*
|
|
* Must be called with xhci->lock held.
|
|
*/
|
|
static int xhci_reserve_host_resources(struct xhci_hcd *xhci,
|
|
struct xhci_container_ctx *in_ctx)
|
|
{
|
|
u32 added_eps;
|
|
|
|
added_eps = xhci_count_num_new_endpoints(xhci, in_ctx);
|
|
if (xhci->num_active_eps + added_eps > xhci->limit_active_eps) {
|
|
xhci_dbg(xhci, "Not enough ep ctxs: "
|
|
"%u active, need to add %u, limit is %u.\n",
|
|
xhci->num_active_eps, added_eps,
|
|
xhci->limit_active_eps);
|
|
return -ENOMEM;
|
|
}
|
|
xhci->num_active_eps += added_eps;
|
|
xhci_dbg(xhci, "Adding %u ep ctxs, %u now active.\n", added_eps,
|
|
xhci->num_active_eps);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The configure endpoint was failed by the xHC for some other reason, so we
|
|
* need to revert the resources that failed configuration would have used.
|
|
*
|
|
* Must be called with xhci->lock held.
|
|
*/
|
|
static void xhci_free_host_resources(struct xhci_hcd *xhci,
|
|
struct xhci_container_ctx *in_ctx)
|
|
{
|
|
u32 num_failed_eps;
|
|
|
|
num_failed_eps = xhci_count_num_new_endpoints(xhci, in_ctx);
|
|
xhci->num_active_eps -= num_failed_eps;
|
|
xhci_dbg(xhci, "Removing %u failed ep ctxs, %u now active.\n",
|
|
num_failed_eps,
|
|
xhci->num_active_eps);
|
|
}
|
|
|
|
/*
|
|
* Now that the command has completed, clean up the active endpoint count by
|
|
* subtracting out the endpoints that were dropped (but not changed).
|
|
*
|
|
* Must be called with xhci->lock held.
|
|
*/
|
|
static void xhci_finish_resource_reservation(struct xhci_hcd *xhci,
|
|
struct xhci_container_ctx *in_ctx)
|
|
{
|
|
u32 num_dropped_eps;
|
|
|
|
num_dropped_eps = xhci_count_num_dropped_endpoints(xhci, in_ctx);
|
|
xhci->num_active_eps -= num_dropped_eps;
|
|
if (num_dropped_eps)
|
|
xhci_dbg(xhci, "Removing %u dropped ep ctxs, %u now active.\n",
|
|
num_dropped_eps,
|
|
xhci->num_active_eps);
|
|
}
|
|
|
|
static unsigned int xhci_get_block_size(struct usb_device *udev)
|
|
{
|
|
switch (udev->speed) {
|
|
case USB_SPEED_LOW:
|
|
case USB_SPEED_FULL:
|
|
return FS_BLOCK;
|
|
case USB_SPEED_HIGH:
|
|
return HS_BLOCK;
|
|
case USB_SPEED_SUPER:
|
|
return SS_BLOCK;
|
|
case USB_SPEED_UNKNOWN:
|
|
case USB_SPEED_WIRELESS:
|
|
default:
|
|
/* Should never happen */
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
static unsigned int
|
|
xhci_get_largest_overhead(struct xhci_interval_bw *interval_bw)
|
|
{
|
|
if (interval_bw->overhead[LS_OVERHEAD_TYPE])
|
|
return LS_OVERHEAD;
|
|
if (interval_bw->overhead[FS_OVERHEAD_TYPE])
|
|
return FS_OVERHEAD;
|
|
return HS_OVERHEAD;
|
|
}
|
|
|
|
/* If we are changing a LS/FS device under a HS hub,
|
|
* make sure (if we are activating a new TT) that the HS bus has enough
|
|
* bandwidth for this new TT.
|
|
*/
|
|
static int xhci_check_tt_bw_table(struct xhci_hcd *xhci,
|
|
struct xhci_virt_device *virt_dev,
|
|
int old_active_eps)
|
|
{
|
|
struct xhci_interval_bw_table *bw_table;
|
|
struct xhci_tt_bw_info *tt_info;
|
|
|
|
/* Find the bandwidth table for the root port this TT is attached to. */
|
|
bw_table = &xhci->rh_bw[virt_dev->real_port - 1].bw_table;
|
|
tt_info = virt_dev->tt_info;
|
|
/* If this TT already had active endpoints, the bandwidth for this TT
|
|
* has already been added. Removing all periodic endpoints (and thus
|
|
* making the TT enactive) will only decrease the bandwidth used.
|
|
*/
|
|
if (old_active_eps)
|
|
return 0;
|
|
if (old_active_eps == 0 && tt_info->active_eps != 0) {
|
|
if (bw_table->bw_used + TT_HS_OVERHEAD > HS_BW_LIMIT)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
/* Not sure why we would have no new active endpoints...
|
|
*
|
|
* Maybe because of an Evaluate Context change for a hub update or a
|
|
* control endpoint 0 max packet size change?
|
|
* FIXME: skip the bandwidth calculation in that case.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
static int xhci_check_ss_bw(struct xhci_hcd *xhci,
|
|
struct xhci_virt_device *virt_dev)
|
|
{
|
|
unsigned int bw_reserved;
|
|
|
|
bw_reserved = DIV_ROUND_UP(SS_BW_RESERVED*SS_BW_LIMIT_IN, 100);
|
|
if (virt_dev->bw_table->ss_bw_in > (SS_BW_LIMIT_IN - bw_reserved))
|
|
return -ENOMEM;
|
|
|
|
bw_reserved = DIV_ROUND_UP(SS_BW_RESERVED*SS_BW_LIMIT_OUT, 100);
|
|
if (virt_dev->bw_table->ss_bw_out > (SS_BW_LIMIT_OUT - bw_reserved))
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This algorithm is a very conservative estimate of the worst-case scheduling
|
|
* scenario for any one interval. The hardware dynamically schedules the
|
|
* packets, so we can't tell which microframe could be the limiting factor in
|
|
* the bandwidth scheduling. This only takes into account periodic endpoints.
|
|
*
|
|
* Obviously, we can't solve an NP complete problem to find the minimum worst
|
|
* case scenario. Instead, we come up with an estimate that is no less than
|
|
* the worst case bandwidth used for any one microframe, but may be an
|
|
* over-estimate.
|
|
*
|
|
* We walk the requirements for each endpoint by interval, starting with the
|
|
* smallest interval, and place packets in the schedule where there is only one
|
|
* possible way to schedule packets for that interval. In order to simplify
|
|
* this algorithm, we record the largest max packet size for each interval, and
|
|
* assume all packets will be that size.
|
|
*
|
|
* For interval 0, we obviously must schedule all packets for each interval.
|
|
* The bandwidth for interval 0 is just the amount of data to be transmitted
|
|
* (the sum of all max ESIT payload sizes, plus any overhead per packet times
|
|
* the number of packets).
|
|
*
|
|
* For interval 1, we have two possible microframes to schedule those packets
|
|
* in. For this algorithm, if we can schedule the same number of packets for
|
|
* each possible scheduling opportunity (each microframe), we will do so. The
|
|
* remaining number of packets will be saved to be transmitted in the gaps in
|
|
* the next interval's scheduling sequence.
|
|
*
|
|
* As we move those remaining packets to be scheduled with interval 2 packets,
|
|
* we have to double the number of remaining packets to transmit. This is
|
|
* because the intervals are actually powers of 2, and we would be transmitting
|
|
* the previous interval's packets twice in this interval. We also have to be
|
|
* sure that when we look at the largest max packet size for this interval, we
|
|
* also look at the largest max packet size for the remaining packets and take
|
|
* the greater of the two.
|
|
*
|
|
* The algorithm continues to evenly distribute packets in each scheduling
|
|
* opportunity, and push the remaining packets out, until we get to the last
|
|
* interval. Then those packets and their associated overhead are just added
|
|
* to the bandwidth used.
|
|
*/
|
|
static int xhci_check_bw_table(struct xhci_hcd *xhci,
|
|
struct xhci_virt_device *virt_dev,
|
|
int old_active_eps)
|
|
{
|
|
unsigned int bw_reserved;
|
|
unsigned int max_bandwidth;
|
|
unsigned int bw_used;
|
|
unsigned int block_size;
|
|
struct xhci_interval_bw_table *bw_table;
|
|
unsigned int packet_size = 0;
|
|
unsigned int overhead = 0;
|
|
unsigned int packets_transmitted = 0;
|
|
unsigned int packets_remaining = 0;
|
|
unsigned int i;
|
|
|
|
if (virt_dev->udev->speed == USB_SPEED_SUPER)
|
|
return xhci_check_ss_bw(xhci, virt_dev);
|
|
|
|
if (virt_dev->udev->speed == USB_SPEED_HIGH) {
|
|
max_bandwidth = HS_BW_LIMIT;
|
|
/* Convert percent of bus BW reserved to blocks reserved */
|
|
bw_reserved = DIV_ROUND_UP(HS_BW_RESERVED * max_bandwidth, 100);
|
|
} else {
|
|
max_bandwidth = FS_BW_LIMIT;
|
|
bw_reserved = DIV_ROUND_UP(FS_BW_RESERVED * max_bandwidth, 100);
|
|
}
|
|
|
|
bw_table = virt_dev->bw_table;
|
|
/* We need to translate the max packet size and max ESIT payloads into
|
|
* the units the hardware uses.
|
|
*/
|
|
block_size = xhci_get_block_size(virt_dev->udev);
|
|
|
|
/* If we are manipulating a LS/FS device under a HS hub, double check
|
|
* that the HS bus has enough bandwidth if we are activing a new TT.
|
|
*/
|
|
if (virt_dev->tt_info) {
|
|
xhci_dbg(xhci, "Recalculating BW for rootport %u\n",
|
|
virt_dev->real_port);
|
|
if (xhci_check_tt_bw_table(xhci, virt_dev, old_active_eps)) {
|
|
xhci_warn(xhci, "Not enough bandwidth on HS bus for "
|
|
"newly activated TT.\n");
|
|
return -ENOMEM;
|
|
}
|
|
xhci_dbg(xhci, "Recalculating BW for TT slot %u port %u\n",
|
|
virt_dev->tt_info->slot_id,
|
|
virt_dev->tt_info->ttport);
|
|
} else {
|
|
xhci_dbg(xhci, "Recalculating BW for rootport %u\n",
|
|
virt_dev->real_port);
|
|
}
|
|
|
|
/* Add in how much bandwidth will be used for interval zero, or the
|
|
* rounded max ESIT payload + number of packets * largest overhead.
|
|
*/
|
|
bw_used = DIV_ROUND_UP(bw_table->interval0_esit_payload, block_size) +
|
|
bw_table->interval_bw[0].num_packets *
|
|
xhci_get_largest_overhead(&bw_table->interval_bw[0]);
|
|
|
|
for (i = 1; i < XHCI_MAX_INTERVAL; i++) {
|
|
unsigned int bw_added;
|
|
unsigned int largest_mps;
|
|
unsigned int interval_overhead;
|
|
|
|
/*
|
|
* How many packets could we transmit in this interval?
|
|
* If packets didn't fit in the previous interval, we will need
|
|
* to transmit that many packets twice within this interval.
|
|
*/
|
|
packets_remaining = 2 * packets_remaining +
|
|
bw_table->interval_bw[i].num_packets;
|
|
|
|
/* Find the largest max packet size of this or the previous
|
|
* interval.
|
|
*/
|
|
if (list_empty(&bw_table->interval_bw[i].endpoints))
|
|
largest_mps = 0;
|
|
else {
|
|
struct xhci_virt_ep *virt_ep;
|
|
struct list_head *ep_entry;
|
|
|
|
ep_entry = bw_table->interval_bw[i].endpoints.next;
|
|
virt_ep = list_entry(ep_entry,
|
|
struct xhci_virt_ep, bw_endpoint_list);
|
|
/* Convert to blocks, rounding up */
|
|
largest_mps = DIV_ROUND_UP(
|
|
virt_ep->bw_info.max_packet_size,
|
|
block_size);
|
|
}
|
|
if (largest_mps > packet_size)
|
|
packet_size = largest_mps;
|
|
|
|
/* Use the larger overhead of this or the previous interval. */
|
|
interval_overhead = xhci_get_largest_overhead(
|
|
&bw_table->interval_bw[i]);
|
|
if (interval_overhead > overhead)
|
|
overhead = interval_overhead;
|
|
|
|
/* How many packets can we evenly distribute across
|
|
* (1 << (i + 1)) possible scheduling opportunities?
|
|
*/
|
|
packets_transmitted = packets_remaining >> (i + 1);
|
|
|
|
/* Add in the bandwidth used for those scheduled packets */
|
|
bw_added = packets_transmitted * (overhead + packet_size);
|
|
|
|
/* How many packets do we have remaining to transmit? */
|
|
packets_remaining = packets_remaining % (1 << (i + 1));
|
|
|
|
/* What largest max packet size should those packets have? */
|
|
/* If we've transmitted all packets, don't carry over the
|
|
* largest packet size.
|
|
*/
|
|
if (packets_remaining == 0) {
|
|
packet_size = 0;
|
|
overhead = 0;
|
|
} else if (packets_transmitted > 0) {
|
|
/* Otherwise if we do have remaining packets, and we've
|
|
* scheduled some packets in this interval, take the
|
|
* largest max packet size from endpoints with this
|
|
* interval.
|
|
*/
|
|
packet_size = largest_mps;
|
|
overhead = interval_overhead;
|
|
}
|
|
/* Otherwise carry over packet_size and overhead from the last
|
|
* time we had a remainder.
|
|
*/
|
|
bw_used += bw_added;
|
|
if (bw_used > max_bandwidth) {
|
|
xhci_warn(xhci, "Not enough bandwidth. "
|
|
"Proposed: %u, Max: %u\n",
|
|
bw_used, max_bandwidth);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
/*
|
|
* Ok, we know we have some packets left over after even-handedly
|
|
* scheduling interval 15. We don't know which microframes they will
|
|
* fit into, so we over-schedule and say they will be scheduled every
|
|
* microframe.
|
|
*/
|
|
if (packets_remaining > 0)
|
|
bw_used += overhead + packet_size;
|
|
|
|
if (!virt_dev->tt_info && virt_dev->udev->speed == USB_SPEED_HIGH) {
|
|
unsigned int port_index = virt_dev->real_port - 1;
|
|
|
|
/* OK, we're manipulating a HS device attached to a
|
|
* root port bandwidth domain. Include the number of active TTs
|
|
* in the bandwidth used.
|
|
*/
|
|
bw_used += TT_HS_OVERHEAD *
|
|
xhci->rh_bw[port_index].num_active_tts;
|
|
}
|
|
|
|
xhci_dbg(xhci, "Final bandwidth: %u, Limit: %u, Reserved: %u, "
|
|
"Available: %u " "percent\n",
|
|
bw_used, max_bandwidth, bw_reserved,
|
|
(max_bandwidth - bw_used - bw_reserved) * 100 /
|
|
max_bandwidth);
|
|
|
|
bw_used += bw_reserved;
|
|
if (bw_used > max_bandwidth) {
|
|
xhci_warn(xhci, "Not enough bandwidth. Proposed: %u, Max: %u\n",
|
|
bw_used, max_bandwidth);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
bw_table->bw_used = bw_used;
|
|
return 0;
|
|
}
|
|
|
|
static bool xhci_is_async_ep(unsigned int ep_type)
|
|
{
|
|
return (ep_type != ISOC_OUT_EP && ep_type != INT_OUT_EP &&
|
|
ep_type != ISOC_IN_EP &&
|
|
ep_type != INT_IN_EP);
|
|
}
|
|
|
|
static bool xhci_is_sync_in_ep(unsigned int ep_type)
|
|
{
|
|
return (ep_type == ISOC_IN_EP || ep_type == INT_IN_EP);
|
|
}
|
|
|
|
static unsigned int xhci_get_ss_bw_consumed(struct xhci_bw_info *ep_bw)
|
|
{
|
|
unsigned int mps = DIV_ROUND_UP(ep_bw->max_packet_size, SS_BLOCK);
|
|
|
|
if (ep_bw->ep_interval == 0)
|
|
return SS_OVERHEAD_BURST +
|
|
(ep_bw->mult * ep_bw->num_packets *
|
|
(SS_OVERHEAD + mps));
|
|
return DIV_ROUND_UP(ep_bw->mult * ep_bw->num_packets *
|
|
(SS_OVERHEAD + mps + SS_OVERHEAD_BURST),
|
|
1 << ep_bw->ep_interval);
|
|
|
|
}
|
|
|
|
void xhci_drop_ep_from_interval_table(struct xhci_hcd *xhci,
|
|
struct xhci_bw_info *ep_bw,
|
|
struct xhci_interval_bw_table *bw_table,
|
|
struct usb_device *udev,
|
|
struct xhci_virt_ep *virt_ep,
|
|
struct xhci_tt_bw_info *tt_info)
|
|
{
|
|
struct xhci_interval_bw *interval_bw;
|
|
int normalized_interval;
|
|
|
|
if (xhci_is_async_ep(ep_bw->type))
|
|
return;
|
|
|
|
if (udev->speed == USB_SPEED_SUPER) {
|
|
if (xhci_is_sync_in_ep(ep_bw->type))
|
|
xhci->devs[udev->slot_id]->bw_table->ss_bw_in -=
|
|
xhci_get_ss_bw_consumed(ep_bw);
|
|
else
|
|
xhci->devs[udev->slot_id]->bw_table->ss_bw_out -=
|
|
xhci_get_ss_bw_consumed(ep_bw);
|
|
return;
|
|
}
|
|
|
|
/* SuperSpeed endpoints never get added to intervals in the table, so
|
|
* this check is only valid for HS/FS/LS devices.
|
|
*/
|
|
if (list_empty(&virt_ep->bw_endpoint_list))
|
|
return;
|
|
/* For LS/FS devices, we need to translate the interval expressed in
|
|
* microframes to frames.
|
|
*/
|
|
if (udev->speed == USB_SPEED_HIGH)
|
|
normalized_interval = ep_bw->ep_interval;
|
|
else
|
|
normalized_interval = ep_bw->ep_interval - 3;
|
|
|
|
if (normalized_interval == 0)
|
|
bw_table->interval0_esit_payload -= ep_bw->max_esit_payload;
|
|
interval_bw = &bw_table->interval_bw[normalized_interval];
|
|
interval_bw->num_packets -= ep_bw->num_packets;
|
|
switch (udev->speed) {
|
|
case USB_SPEED_LOW:
|
|
interval_bw->overhead[LS_OVERHEAD_TYPE] -= 1;
|
|
break;
|
|
case USB_SPEED_FULL:
|
|
interval_bw->overhead[FS_OVERHEAD_TYPE] -= 1;
|
|
break;
|
|
case USB_SPEED_HIGH:
|
|
interval_bw->overhead[HS_OVERHEAD_TYPE] -= 1;
|
|
break;
|
|
case USB_SPEED_SUPER:
|
|
case USB_SPEED_UNKNOWN:
|
|
case USB_SPEED_WIRELESS:
|
|
/* Should never happen because only LS/FS/HS endpoints will get
|
|
* added to the endpoint list.
|
|
*/
|
|
return;
|
|
}
|
|
if (tt_info)
|
|
tt_info->active_eps -= 1;
|
|
list_del_init(&virt_ep->bw_endpoint_list);
|
|
}
|
|
|
|
static void xhci_add_ep_to_interval_table(struct xhci_hcd *xhci,
|
|
struct xhci_bw_info *ep_bw,
|
|
struct xhci_interval_bw_table *bw_table,
|
|
struct usb_device *udev,
|
|
struct xhci_virt_ep *virt_ep,
|
|
struct xhci_tt_bw_info *tt_info)
|
|
{
|
|
struct xhci_interval_bw *interval_bw;
|
|
struct xhci_virt_ep *smaller_ep;
|
|
int normalized_interval;
|
|
|
|
if (xhci_is_async_ep(ep_bw->type))
|
|
return;
|
|
|
|
if (udev->speed == USB_SPEED_SUPER) {
|
|
if (xhci_is_sync_in_ep(ep_bw->type))
|
|
xhci->devs[udev->slot_id]->bw_table->ss_bw_in +=
|
|
xhci_get_ss_bw_consumed(ep_bw);
|
|
else
|
|
xhci->devs[udev->slot_id]->bw_table->ss_bw_out +=
|
|
xhci_get_ss_bw_consumed(ep_bw);
|
|
return;
|
|
}
|
|
|
|
/* For LS/FS devices, we need to translate the interval expressed in
|
|
* microframes to frames.
|
|
*/
|
|
if (udev->speed == USB_SPEED_HIGH)
|
|
normalized_interval = ep_bw->ep_interval;
|
|
else
|
|
normalized_interval = ep_bw->ep_interval - 3;
|
|
|
|
if (normalized_interval == 0)
|
|
bw_table->interval0_esit_payload += ep_bw->max_esit_payload;
|
|
interval_bw = &bw_table->interval_bw[normalized_interval];
|
|
interval_bw->num_packets += ep_bw->num_packets;
|
|
switch (udev->speed) {
|
|
case USB_SPEED_LOW:
|
|
interval_bw->overhead[LS_OVERHEAD_TYPE] += 1;
|
|
break;
|
|
case USB_SPEED_FULL:
|
|
interval_bw->overhead[FS_OVERHEAD_TYPE] += 1;
|
|
break;
|
|
case USB_SPEED_HIGH:
|
|
interval_bw->overhead[HS_OVERHEAD_TYPE] += 1;
|
|
break;
|
|
case USB_SPEED_SUPER:
|
|
case USB_SPEED_UNKNOWN:
|
|
case USB_SPEED_WIRELESS:
|
|
/* Should never happen because only LS/FS/HS endpoints will get
|
|
* added to the endpoint list.
|
|
*/
|
|
return;
|
|
}
|
|
|
|
if (tt_info)
|
|
tt_info->active_eps += 1;
|
|
/* Insert the endpoint into the list, largest max packet size first. */
|
|
list_for_each_entry(smaller_ep, &interval_bw->endpoints,
|
|
bw_endpoint_list) {
|
|
if (ep_bw->max_packet_size >=
|
|
smaller_ep->bw_info.max_packet_size) {
|
|
/* Add the new ep before the smaller endpoint */
|
|
list_add_tail(&virt_ep->bw_endpoint_list,
|
|
&smaller_ep->bw_endpoint_list);
|
|
return;
|
|
}
|
|
}
|
|
/* Add the new endpoint at the end of the list. */
|
|
list_add_tail(&virt_ep->bw_endpoint_list,
|
|
&interval_bw->endpoints);
|
|
}
|
|
|
|
void xhci_update_tt_active_eps(struct xhci_hcd *xhci,
|
|
struct xhci_virt_device *virt_dev,
|
|
int old_active_eps)
|
|
{
|
|
struct xhci_root_port_bw_info *rh_bw_info;
|
|
if (!virt_dev->tt_info)
|
|
return;
|
|
|
|
rh_bw_info = &xhci->rh_bw[virt_dev->real_port - 1];
|
|
if (old_active_eps == 0 &&
|
|
virt_dev->tt_info->active_eps != 0) {
|
|
rh_bw_info->num_active_tts += 1;
|
|
rh_bw_info->bw_table.bw_used += TT_HS_OVERHEAD;
|
|
} else if (old_active_eps != 0 &&
|
|
virt_dev->tt_info->active_eps == 0) {
|
|
rh_bw_info->num_active_tts -= 1;
|
|
rh_bw_info->bw_table.bw_used -= TT_HS_OVERHEAD;
|
|
}
|
|
}
|
|
|
|
static int xhci_reserve_bandwidth(struct xhci_hcd *xhci,
|
|
struct xhci_virt_device *virt_dev,
|
|
struct xhci_container_ctx *in_ctx)
|
|
{
|
|
struct xhci_bw_info ep_bw_info[31];
|
|
int i;
|
|
struct xhci_input_control_ctx *ctrl_ctx;
|
|
int old_active_eps = 0;
|
|
|
|
if (virt_dev->tt_info)
|
|
old_active_eps = virt_dev->tt_info->active_eps;
|
|
|
|
ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
|
|
|
|
for (i = 0; i < 31; i++) {
|
|
if (!EP_IS_ADDED(ctrl_ctx, i) && !EP_IS_DROPPED(ctrl_ctx, i))
|
|
continue;
|
|
|
|
/* Make a copy of the BW info in case we need to revert this */
|
|
memcpy(&ep_bw_info[i], &virt_dev->eps[i].bw_info,
|
|
sizeof(ep_bw_info[i]));
|
|
/* Drop the endpoint from the interval table if the endpoint is
|
|
* being dropped or changed.
|
|
*/
|
|
if (EP_IS_DROPPED(ctrl_ctx, i))
|
|
xhci_drop_ep_from_interval_table(xhci,
|
|
&virt_dev->eps[i].bw_info,
|
|
virt_dev->bw_table,
|
|
virt_dev->udev,
|
|
&virt_dev->eps[i],
|
|
virt_dev->tt_info);
|
|
}
|
|
/* Overwrite the information stored in the endpoints' bw_info */
|
|
xhci_update_bw_info(xhci, virt_dev->in_ctx, ctrl_ctx, virt_dev);
|
|
for (i = 0; i < 31; i++) {
|
|
/* Add any changed or added endpoints to the interval table */
|
|
if (EP_IS_ADDED(ctrl_ctx, i))
|
|
xhci_add_ep_to_interval_table(xhci,
|
|
&virt_dev->eps[i].bw_info,
|
|
virt_dev->bw_table,
|
|
virt_dev->udev,
|
|
&virt_dev->eps[i],
|
|
virt_dev->tt_info);
|
|
}
|
|
|
|
if (!xhci_check_bw_table(xhci, virt_dev, old_active_eps)) {
|
|
/* Ok, this fits in the bandwidth we have.
|
|
* Update the number of active TTs.
|
|
*/
|
|
xhci_update_tt_active_eps(xhci, virt_dev, old_active_eps);
|
|
return 0;
|
|
}
|
|
|
|
/* We don't have enough bandwidth for this, revert the stored info. */
|
|
for (i = 0; i < 31; i++) {
|
|
if (!EP_IS_ADDED(ctrl_ctx, i) && !EP_IS_DROPPED(ctrl_ctx, i))
|
|
continue;
|
|
|
|
/* Drop the new copies of any added or changed endpoints from
|
|
* the interval table.
|
|
*/
|
|
if (EP_IS_ADDED(ctrl_ctx, i)) {
|
|
xhci_drop_ep_from_interval_table(xhci,
|
|
&virt_dev->eps[i].bw_info,
|
|
virt_dev->bw_table,
|
|
virt_dev->udev,
|
|
&virt_dev->eps[i],
|
|
virt_dev->tt_info);
|
|
}
|
|
/* Revert the endpoint back to its old information */
|
|
memcpy(&virt_dev->eps[i].bw_info, &ep_bw_info[i],
|
|
sizeof(ep_bw_info[i]));
|
|
/* Add any changed or dropped endpoints back into the table */
|
|
if (EP_IS_DROPPED(ctrl_ctx, i))
|
|
xhci_add_ep_to_interval_table(xhci,
|
|
&virt_dev->eps[i].bw_info,
|
|
virt_dev->bw_table,
|
|
virt_dev->udev,
|
|
&virt_dev->eps[i],
|
|
virt_dev->tt_info);
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
|
|
|
|
/* Issue a configure endpoint command or evaluate context command
|
|
* and wait for it to finish.
|
|
*/
|
|
static int xhci_configure_endpoint(struct xhci_hcd *xhci,
|
|
struct usb_device *udev,
|
|
struct xhci_command *command,
|
|
bool ctx_change, bool must_succeed)
|
|
{
|
|
int ret;
|
|
int timeleft;
|
|
unsigned long flags;
|
|
struct xhci_container_ctx *in_ctx;
|
|
struct completion *cmd_completion;
|
|
u32 *cmd_status;
|
|
struct xhci_virt_device *virt_dev;
|
|
union xhci_trb *cmd_trb;
|
|
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
virt_dev = xhci->devs[udev->slot_id];
|
|
|
|
if (command)
|
|
in_ctx = command->in_ctx;
|
|
else
|
|
in_ctx = virt_dev->in_ctx;
|
|
|
|
if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK) &&
|
|
xhci_reserve_host_resources(xhci, in_ctx)) {
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
xhci_warn(xhci, "Not enough host resources, "
|
|
"active endpoint contexts = %u\n",
|
|
xhci->num_active_eps);
|
|
return -ENOMEM;
|
|
}
|
|
if ((xhci->quirks & XHCI_SW_BW_CHECKING) &&
|
|
xhci_reserve_bandwidth(xhci, virt_dev, in_ctx)) {
|
|
if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK))
|
|
xhci_free_host_resources(xhci, in_ctx);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
xhci_warn(xhci, "Not enough bandwidth\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (command) {
|
|
cmd_completion = command->completion;
|
|
cmd_status = &command->status;
|
|
command->command_trb = xhci->cmd_ring->enqueue;
|
|
|
|
/* Enqueue pointer can be left pointing to the link TRB,
|
|
* we must handle that
|
|
*/
|
|
if (TRB_TYPE_LINK_LE32(command->command_trb->link.control))
|
|
command->command_trb =
|
|
xhci->cmd_ring->enq_seg->next->trbs;
|
|
|
|
list_add_tail(&command->cmd_list, &virt_dev->cmd_list);
|
|
} else {
|
|
cmd_completion = &virt_dev->cmd_completion;
|
|
cmd_status = &virt_dev->cmd_status;
|
|
}
|
|
init_completion(cmd_completion);
|
|
|
|
cmd_trb = xhci->cmd_ring->dequeue;
|
|
if (!ctx_change)
|
|
ret = xhci_queue_configure_endpoint(xhci, in_ctx->dma,
|
|
udev->slot_id, must_succeed);
|
|
else
|
|
ret = xhci_queue_evaluate_context(xhci, in_ctx->dma,
|
|
udev->slot_id, must_succeed);
|
|
if (ret < 0) {
|
|
if (command)
|
|
list_del(&command->cmd_list);
|
|
if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK))
|
|
xhci_free_host_resources(xhci, in_ctx);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
xhci_dbg(xhci, "FIXME allocate a new ring segment\n");
|
|
return -ENOMEM;
|
|
}
|
|
xhci_ring_cmd_db(xhci);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
|
|
/* Wait for the configure endpoint command to complete */
|
|
timeleft = wait_for_completion_interruptible_timeout(
|
|
cmd_completion,
|
|
XHCI_CMD_DEFAULT_TIMEOUT);
|
|
if (timeleft <= 0) {
|
|
xhci_warn(xhci, "%s while waiting for %s command\n",
|
|
timeleft == 0 ? "Timeout" : "Signal",
|
|
ctx_change == 0 ?
|
|
"configure endpoint" :
|
|
"evaluate context");
|
|
/* cancel the configure endpoint command */
|
|
ret = xhci_cancel_cmd(xhci, command, cmd_trb);
|
|
if (ret < 0)
|
|
return ret;
|
|
return -ETIME;
|
|
}
|
|
|
|
if (!ctx_change)
|
|
ret = xhci_configure_endpoint_result(xhci, udev, cmd_status);
|
|
else
|
|
ret = xhci_evaluate_context_result(xhci, udev, cmd_status);
|
|
|
|
if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK)) {
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
/* If the command failed, remove the reserved resources.
|
|
* Otherwise, clean up the estimate to include dropped eps.
|
|
*/
|
|
if (ret)
|
|
xhci_free_host_resources(xhci, in_ctx);
|
|
else
|
|
xhci_finish_resource_reservation(xhci, in_ctx);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/* Called after one or more calls to xhci_add_endpoint() or
|
|
* xhci_drop_endpoint(). If this call fails, the USB core is expected
|
|
* to call xhci_reset_bandwidth().
|
|
*
|
|
* Since we are in the middle of changing either configuration or
|
|
* installing a new alt setting, the USB core won't allow URBs to be
|
|
* enqueued for any endpoint on the old config or interface. Nothing
|
|
* else should be touching the xhci->devs[slot_id] structure, so we
|
|
* don't need to take the xhci->lock for manipulating that.
|
|
*/
|
|
int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
|
|
{
|
|
int i;
|
|
int ret = 0;
|
|
struct xhci_hcd *xhci;
|
|
struct xhci_virt_device *virt_dev;
|
|
struct xhci_input_control_ctx *ctrl_ctx;
|
|
struct xhci_slot_ctx *slot_ctx;
|
|
|
|
ret = xhci_check_args(hcd, udev, NULL, 0, true, __func__);
|
|
if (ret <= 0)
|
|
return ret;
|
|
xhci = hcd_to_xhci(hcd);
|
|
if (xhci->xhc_state & XHCI_STATE_DYING)
|
|
return -ENODEV;
|
|
|
|
xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
|
|
virt_dev = xhci->devs[udev->slot_id];
|
|
|
|
/* See section 4.6.6 - A0 = 1; A1 = D0 = D1 = 0 */
|
|
ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
|
|
ctrl_ctx->add_flags |= cpu_to_le32(SLOT_FLAG);
|
|
ctrl_ctx->add_flags &= cpu_to_le32(~EP0_FLAG);
|
|
ctrl_ctx->drop_flags &= cpu_to_le32(~(SLOT_FLAG | EP0_FLAG));
|
|
|
|
/* Don't issue the command if there's no endpoints to update. */
|
|
if (ctrl_ctx->add_flags == cpu_to_le32(SLOT_FLAG) &&
|
|
ctrl_ctx->drop_flags == 0)
|
|
return 0;
|
|
|
|
xhci_dbg(xhci, "New Input Control Context:\n");
|
|
slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
|
|
xhci_dbg_ctx(xhci, virt_dev->in_ctx,
|
|
LAST_CTX_TO_EP_NUM(le32_to_cpu(slot_ctx->dev_info)));
|
|
|
|
ret = xhci_configure_endpoint(xhci, udev, NULL,
|
|
false, false);
|
|
if (ret) {
|
|
/* Callee should call reset_bandwidth() */
|
|
return ret;
|
|
}
|
|
|
|
xhci_dbg(xhci, "Output context after successful config ep cmd:\n");
|
|
xhci_dbg_ctx(xhci, virt_dev->out_ctx,
|
|
LAST_CTX_TO_EP_NUM(le32_to_cpu(slot_ctx->dev_info)));
|
|
|
|
/* Free any rings that were dropped, but not changed. */
|
|
for (i = 1; i < 31; ++i) {
|
|
if ((le32_to_cpu(ctrl_ctx->drop_flags) & (1 << (i + 1))) &&
|
|
!(le32_to_cpu(ctrl_ctx->add_flags) & (1 << (i + 1))))
|
|
xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i);
|
|
}
|
|
xhci_zero_in_ctx(xhci, virt_dev);
|
|
/*
|
|
* Install any rings for completely new endpoints or changed endpoints,
|
|
* and free or cache any old rings from changed endpoints.
|
|
*/
|
|
for (i = 1; i < 31; ++i) {
|
|
if (!virt_dev->eps[i].new_ring)
|
|
continue;
|
|
/* Only cache or free the old ring if it exists.
|
|
* It may not if this is the first add of an endpoint.
|
|
*/
|
|
if (virt_dev->eps[i].ring) {
|
|
xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i);
|
|
}
|
|
virt_dev->eps[i].ring = virt_dev->eps[i].new_ring;
|
|
virt_dev->eps[i].new_ring = NULL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
|
|
{
|
|
struct xhci_hcd *xhci;
|
|
struct xhci_virt_device *virt_dev;
|
|
int i, ret;
|
|
|
|
ret = xhci_check_args(hcd, udev, NULL, 0, true, __func__);
|
|
if (ret <= 0)
|
|
return;
|
|
xhci = hcd_to_xhci(hcd);
|
|
|
|
xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
|
|
virt_dev = xhci->devs[udev->slot_id];
|
|
/* Free any rings allocated for added endpoints */
|
|
for (i = 0; i < 31; ++i) {
|
|
if (virt_dev->eps[i].new_ring) {
|
|
xhci_ring_free(xhci, virt_dev->eps[i].new_ring);
|
|
virt_dev->eps[i].new_ring = NULL;
|
|
}
|
|
}
|
|
xhci_zero_in_ctx(xhci, virt_dev);
|
|
}
|
|
|
|
static void xhci_setup_input_ctx_for_config_ep(struct xhci_hcd *xhci,
|
|
struct xhci_container_ctx *in_ctx,
|
|
struct xhci_container_ctx *out_ctx,
|
|
u32 add_flags, u32 drop_flags)
|
|
{
|
|
struct xhci_input_control_ctx *ctrl_ctx;
|
|
ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
|
|
ctrl_ctx->add_flags = cpu_to_le32(add_flags);
|
|
ctrl_ctx->drop_flags = cpu_to_le32(drop_flags);
|
|
xhci_slot_copy(xhci, in_ctx, out_ctx);
|
|
ctrl_ctx->add_flags |= cpu_to_le32(SLOT_FLAG);
|
|
|
|
xhci_dbg(xhci, "Input Context:\n");
|
|
xhci_dbg_ctx(xhci, in_ctx, xhci_last_valid_endpoint(add_flags));
|
|
}
|
|
|
|
static void xhci_setup_input_ctx_for_quirk(struct xhci_hcd *xhci,
|
|
unsigned int slot_id, unsigned int ep_index,
|
|
struct xhci_dequeue_state *deq_state)
|
|
{
|
|
struct xhci_container_ctx *in_ctx;
|
|
struct xhci_ep_ctx *ep_ctx;
|
|
u32 added_ctxs;
|
|
dma_addr_t addr;
|
|
|
|
xhci_endpoint_copy(xhci, xhci->devs[slot_id]->in_ctx,
|
|
xhci->devs[slot_id]->out_ctx, ep_index);
|
|
in_ctx = xhci->devs[slot_id]->in_ctx;
|
|
ep_ctx = xhci_get_ep_ctx(xhci, in_ctx, ep_index);
|
|
addr = xhci_trb_virt_to_dma(deq_state->new_deq_seg,
|
|
deq_state->new_deq_ptr);
|
|
if (addr == 0) {
|
|
xhci_warn(xhci, "WARN Cannot submit config ep after "
|
|
"reset ep command\n");
|
|
xhci_warn(xhci, "WARN deq seg = %p, deq ptr = %p\n",
|
|
deq_state->new_deq_seg,
|
|
deq_state->new_deq_ptr);
|
|
return;
|
|
}
|
|
ep_ctx->deq = cpu_to_le64(addr | deq_state->new_cycle_state);
|
|
|
|
added_ctxs = xhci_get_endpoint_flag_from_index(ep_index);
|
|
xhci_setup_input_ctx_for_config_ep(xhci, xhci->devs[slot_id]->in_ctx,
|
|
xhci->devs[slot_id]->out_ctx, added_ctxs, added_ctxs);
|
|
}
|
|
|
|
void xhci_cleanup_stalled_ring(struct xhci_hcd *xhci,
|
|
struct usb_device *udev, unsigned int ep_index)
|
|
{
|
|
struct xhci_dequeue_state deq_state;
|
|
struct xhci_virt_ep *ep;
|
|
|
|
xhci_dbg(xhci, "Cleaning up stalled endpoint ring\n");
|
|
ep = &xhci->devs[udev->slot_id]->eps[ep_index];
|
|
/* We need to move the HW's dequeue pointer past this TD,
|
|
* or it will attempt to resend it on the next doorbell ring.
|
|
*/
|
|
xhci_find_new_dequeue_state(xhci, udev->slot_id,
|
|
ep_index, ep->stopped_stream, ep->stopped_td,
|
|
&deq_state);
|
|
|
|
/* HW with the reset endpoint quirk will use the saved dequeue state to
|
|
* issue a configure endpoint command later.
|
|
*/
|
|
if (!(xhci->quirks & XHCI_RESET_EP_QUIRK)) {
|
|
xhci_dbg(xhci, "Queueing new dequeue state\n");
|
|
xhci_queue_new_dequeue_state(xhci, udev->slot_id,
|
|
ep_index, ep->stopped_stream, &deq_state);
|
|
} else {
|
|
/* Better hope no one uses the input context between now and the
|
|
* reset endpoint completion!
|
|
* XXX: No idea how this hardware will react when stream rings
|
|
* are enabled.
|
|
*/
|
|
xhci_dbg(xhci, "Setting up input context for "
|
|
"configure endpoint command\n");
|
|
xhci_setup_input_ctx_for_quirk(xhci, udev->slot_id,
|
|
ep_index, &deq_state);
|
|
}
|
|
}
|
|
|
|
/* Deal with stalled endpoints. The core should have sent the control message
|
|
* to clear the halt condition. However, we need to make the xHCI hardware
|
|
* reset its sequence number, since a device will expect a sequence number of
|
|
* zero after the halt condition is cleared.
|
|
* Context: in_interrupt
|
|
*/
|
|
void xhci_endpoint_reset(struct usb_hcd *hcd,
|
|
struct usb_host_endpoint *ep)
|
|
{
|
|
struct xhci_hcd *xhci;
|
|
struct usb_device *udev;
|
|
unsigned int ep_index;
|
|
unsigned long flags;
|
|
int ret;
|
|
struct xhci_virt_ep *virt_ep;
|
|
|
|
xhci = hcd_to_xhci(hcd);
|
|
udev = (struct usb_device *) ep->hcpriv;
|
|
/* Called with a root hub endpoint (or an endpoint that wasn't added
|
|
* with xhci_add_endpoint()
|
|
*/
|
|
if (!ep->hcpriv)
|
|
return;
|
|
ep_index = xhci_get_endpoint_index(&ep->desc);
|
|
virt_ep = &xhci->devs[udev->slot_id]->eps[ep_index];
|
|
if (!virt_ep->stopped_td) {
|
|
xhci_dbg(xhci, "Endpoint 0x%x not halted, refusing to reset.\n",
|
|
ep->desc.bEndpointAddress);
|
|
return;
|
|
}
|
|
if (usb_endpoint_xfer_control(&ep->desc)) {
|
|
xhci_dbg(xhci, "Control endpoint stall already handled.\n");
|
|
return;
|
|
}
|
|
|
|
xhci_dbg(xhci, "Queueing reset endpoint command\n");
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
ret = xhci_queue_reset_ep(xhci, udev->slot_id, ep_index);
|
|
/*
|
|
* Can't change the ring dequeue pointer until it's transitioned to the
|
|
* stopped state, which is only upon a successful reset endpoint
|
|
* command. Better hope that last command worked!
|
|
*/
|
|
if (!ret) {
|
|
xhci_cleanup_stalled_ring(xhci, udev, ep_index);
|
|
kfree(virt_ep->stopped_td);
|
|
xhci_ring_cmd_db(xhci);
|
|
}
|
|
virt_ep->stopped_td = NULL;
|
|
virt_ep->stopped_trb = NULL;
|
|
virt_ep->stopped_stream = 0;
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
|
|
if (ret)
|
|
xhci_warn(xhci, "FIXME allocate a new ring segment\n");
|
|
}
|
|
|
|
static int xhci_check_streams_endpoint(struct xhci_hcd *xhci,
|
|
struct usb_device *udev, struct usb_host_endpoint *ep,
|
|
unsigned int slot_id)
|
|
{
|
|
int ret;
|
|
unsigned int ep_index;
|
|
unsigned int ep_state;
|
|
|
|
if (!ep)
|
|
return -EINVAL;
|
|
ret = xhci_check_args(xhci_to_hcd(xhci), udev, ep, 1, true, __func__);
|
|
if (ret <= 0)
|
|
return -EINVAL;
|
|
if (ep->ss_ep_comp.bmAttributes == 0) {
|
|
xhci_warn(xhci, "WARN: SuperSpeed Endpoint Companion"
|
|
" descriptor for ep 0x%x does not support streams\n",
|
|
ep->desc.bEndpointAddress);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ep_index = xhci_get_endpoint_index(&ep->desc);
|
|
ep_state = xhci->devs[slot_id]->eps[ep_index].ep_state;
|
|
if (ep_state & EP_HAS_STREAMS ||
|
|
ep_state & EP_GETTING_STREAMS) {
|
|
xhci_warn(xhci, "WARN: SuperSpeed bulk endpoint 0x%x "
|
|
"already has streams set up.\n",
|
|
ep->desc.bEndpointAddress);
|
|
xhci_warn(xhci, "Send email to xHCI maintainer and ask for "
|
|
"dynamic stream context array reallocation.\n");
|
|
return -EINVAL;
|
|
}
|
|
if (!list_empty(&xhci->devs[slot_id]->eps[ep_index].ring->td_list)) {
|
|
xhci_warn(xhci, "Cannot setup streams for SuperSpeed bulk "
|
|
"endpoint 0x%x; URBs are pending.\n",
|
|
ep->desc.bEndpointAddress);
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void xhci_calculate_streams_entries(struct xhci_hcd *xhci,
|
|
unsigned int *num_streams, unsigned int *num_stream_ctxs)
|
|
{
|
|
unsigned int max_streams;
|
|
|
|
/* The stream context array size must be a power of two */
|
|
*num_stream_ctxs = roundup_pow_of_two(*num_streams);
|
|
/*
|
|
* Find out how many primary stream array entries the host controller
|
|
* supports. Later we may use secondary stream arrays (similar to 2nd
|
|
* level page entries), but that's an optional feature for xHCI host
|
|
* controllers. xHCs must support at least 4 stream IDs.
|
|
*/
|
|
max_streams = HCC_MAX_PSA(xhci->hcc_params);
|
|
if (*num_stream_ctxs > max_streams) {
|
|
xhci_dbg(xhci, "xHCI HW only supports %u stream ctx entries.\n",
|
|
max_streams);
|
|
*num_stream_ctxs = max_streams;
|
|
*num_streams = max_streams;
|
|
}
|
|
}
|
|
|
|
/* Returns an error code if one of the endpoint already has streams.
|
|
* This does not change any data structures, it only checks and gathers
|
|
* information.
|
|
*/
|
|
static int xhci_calculate_streams_and_bitmask(struct xhci_hcd *xhci,
|
|
struct usb_device *udev,
|
|
struct usb_host_endpoint **eps, unsigned int num_eps,
|
|
unsigned int *num_streams, u32 *changed_ep_bitmask)
|
|
{
|
|
unsigned int max_streams;
|
|
unsigned int endpoint_flag;
|
|
int i;
|
|
int ret;
|
|
|
|
for (i = 0; i < num_eps; i++) {
|
|
ret = xhci_check_streams_endpoint(xhci, udev,
|
|
eps[i], udev->slot_id);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
max_streams = usb_ss_max_streams(&eps[i]->ss_ep_comp);
|
|
if (max_streams < (*num_streams - 1)) {
|
|
xhci_dbg(xhci, "Ep 0x%x only supports %u stream IDs.\n",
|
|
eps[i]->desc.bEndpointAddress,
|
|
max_streams);
|
|
*num_streams = max_streams+1;
|
|
}
|
|
|
|
endpoint_flag = xhci_get_endpoint_flag(&eps[i]->desc);
|
|
if (*changed_ep_bitmask & endpoint_flag)
|
|
return -EINVAL;
|
|
*changed_ep_bitmask |= endpoint_flag;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static u32 xhci_calculate_no_streams_bitmask(struct xhci_hcd *xhci,
|
|
struct usb_device *udev,
|
|
struct usb_host_endpoint **eps, unsigned int num_eps)
|
|
{
|
|
u32 changed_ep_bitmask = 0;
|
|
unsigned int slot_id;
|
|
unsigned int ep_index;
|
|
unsigned int ep_state;
|
|
int i;
|
|
|
|
slot_id = udev->slot_id;
|
|
if (!xhci->devs[slot_id])
|
|
return 0;
|
|
|
|
for (i = 0; i < num_eps; i++) {
|
|
ep_index = xhci_get_endpoint_index(&eps[i]->desc);
|
|
ep_state = xhci->devs[slot_id]->eps[ep_index].ep_state;
|
|
/* Are streams already being freed for the endpoint? */
|
|
if (ep_state & EP_GETTING_NO_STREAMS) {
|
|
xhci_warn(xhci, "WARN Can't disable streams for "
|
|
"endpoint 0x%x\n, "
|
|
"streams are being disabled already.",
|
|
eps[i]->desc.bEndpointAddress);
|
|
return 0;
|
|
}
|
|
/* Are there actually any streams to free? */
|
|
if (!(ep_state & EP_HAS_STREAMS) &&
|
|
!(ep_state & EP_GETTING_STREAMS)) {
|
|
xhci_warn(xhci, "WARN Can't disable streams for "
|
|
"endpoint 0x%x\n, "
|
|
"streams are already disabled!",
|
|
eps[i]->desc.bEndpointAddress);
|
|
xhci_warn(xhci, "WARN xhci_free_streams() called "
|
|
"with non-streams endpoint\n");
|
|
return 0;
|
|
}
|
|
changed_ep_bitmask |= xhci_get_endpoint_flag(&eps[i]->desc);
|
|
}
|
|
return changed_ep_bitmask;
|
|
}
|
|
|
|
/*
|
|
* The USB device drivers use this function (though the HCD interface in USB
|
|
* core) to prepare a set of bulk endpoints to use streams. Streams are used to
|
|
* coordinate mass storage command queueing across multiple endpoints (basically
|
|
* a stream ID == a task ID).
|
|
*
|
|
* Setting up streams involves allocating the same size stream context array
|
|
* for each endpoint and issuing a configure endpoint command for all endpoints.
|
|
*
|
|
* Don't allow the call to succeed if one endpoint only supports one stream
|
|
* (which means it doesn't support streams at all).
|
|
*
|
|
* Drivers may get less stream IDs than they asked for, if the host controller
|
|
* hardware or endpoints claim they can't support the number of requested
|
|
* stream IDs.
|
|
*/
|
|
int xhci_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
|
|
struct usb_host_endpoint **eps, unsigned int num_eps,
|
|
unsigned int num_streams, gfp_t mem_flags)
|
|
{
|
|
int i, ret;
|
|
struct xhci_hcd *xhci;
|
|
struct xhci_virt_device *vdev;
|
|
struct xhci_command *config_cmd;
|
|
unsigned int ep_index;
|
|
unsigned int num_stream_ctxs;
|
|
unsigned long flags;
|
|
u32 changed_ep_bitmask = 0;
|
|
|
|
if (!eps)
|
|
return -EINVAL;
|
|
|
|
/* Add one to the number of streams requested to account for
|
|
* stream 0 that is reserved for xHCI usage.
|
|
*/
|
|
num_streams += 1;
|
|
xhci = hcd_to_xhci(hcd);
|
|
xhci_dbg(xhci, "Driver wants %u stream IDs (including stream 0).\n",
|
|
num_streams);
|
|
|
|
config_cmd = xhci_alloc_command(xhci, true, true, mem_flags);
|
|
if (!config_cmd) {
|
|
xhci_dbg(xhci, "Could not allocate xHCI command structure.\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Check to make sure all endpoints are not already configured for
|
|
* streams. While we're at it, find the maximum number of streams that
|
|
* all the endpoints will support and check for duplicate endpoints.
|
|
*/
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
ret = xhci_calculate_streams_and_bitmask(xhci, udev, eps,
|
|
num_eps, &num_streams, &changed_ep_bitmask);
|
|
if (ret < 0) {
|
|
xhci_free_command(xhci, config_cmd);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
return ret;
|
|
}
|
|
if (num_streams <= 1) {
|
|
xhci_warn(xhci, "WARN: endpoints can't handle "
|
|
"more than one stream.\n");
|
|
xhci_free_command(xhci, config_cmd);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
return -EINVAL;
|
|
}
|
|
vdev = xhci->devs[udev->slot_id];
|
|
/* Mark each endpoint as being in transition, so
|
|
* xhci_urb_enqueue() will reject all URBs.
|
|
*/
|
|
for (i = 0; i < num_eps; i++) {
|
|
ep_index = xhci_get_endpoint_index(&eps[i]->desc);
|
|
vdev->eps[ep_index].ep_state |= EP_GETTING_STREAMS;
|
|
}
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
|
|
/* Setup internal data structures and allocate HW data structures for
|
|
* streams (but don't install the HW structures in the input context
|
|
* until we're sure all memory allocation succeeded).
|
|
*/
|
|
xhci_calculate_streams_entries(xhci, &num_streams, &num_stream_ctxs);
|
|
xhci_dbg(xhci, "Need %u stream ctx entries for %u stream IDs.\n",
|
|
num_stream_ctxs, num_streams);
|
|
|
|
for (i = 0; i < num_eps; i++) {
|
|
ep_index = xhci_get_endpoint_index(&eps[i]->desc);
|
|
vdev->eps[ep_index].stream_info = xhci_alloc_stream_info(xhci,
|
|
num_stream_ctxs,
|
|
num_streams, mem_flags);
|
|
if (!vdev->eps[ep_index].stream_info)
|
|
goto cleanup;
|
|
/* Set maxPstreams in endpoint context and update deq ptr to
|
|
* point to stream context array. FIXME
|
|
*/
|
|
}
|
|
|
|
/* Set up the input context for a configure endpoint command. */
|
|
for (i = 0; i < num_eps; i++) {
|
|
struct xhci_ep_ctx *ep_ctx;
|
|
|
|
ep_index = xhci_get_endpoint_index(&eps[i]->desc);
|
|
ep_ctx = xhci_get_ep_ctx(xhci, config_cmd->in_ctx, ep_index);
|
|
|
|
xhci_endpoint_copy(xhci, config_cmd->in_ctx,
|
|
vdev->out_ctx, ep_index);
|
|
xhci_setup_streams_ep_input_ctx(xhci, ep_ctx,
|
|
vdev->eps[ep_index].stream_info);
|
|
}
|
|
/* Tell the HW to drop its old copy of the endpoint context info
|
|
* and add the updated copy from the input context.
|
|
*/
|
|
xhci_setup_input_ctx_for_config_ep(xhci, config_cmd->in_ctx,
|
|
vdev->out_ctx, changed_ep_bitmask, changed_ep_bitmask);
|
|
|
|
/* Issue and wait for the configure endpoint command */
|
|
ret = xhci_configure_endpoint(xhci, udev, config_cmd,
|
|
false, false);
|
|
|
|
/* xHC rejected the configure endpoint command for some reason, so we
|
|
* leave the old ring intact and free our internal streams data
|
|
* structure.
|
|
*/
|
|
if (ret < 0)
|
|
goto cleanup;
|
|
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
for (i = 0; i < num_eps; i++) {
|
|
ep_index = xhci_get_endpoint_index(&eps[i]->desc);
|
|
vdev->eps[ep_index].ep_state &= ~EP_GETTING_STREAMS;
|
|
xhci_dbg(xhci, "Slot %u ep ctx %u now has streams.\n",
|
|
udev->slot_id, ep_index);
|
|
vdev->eps[ep_index].ep_state |= EP_HAS_STREAMS;
|
|
}
|
|
xhci_free_command(xhci, config_cmd);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
|
|
/* Subtract 1 for stream 0, which drivers can't use */
|
|
return num_streams - 1;
|
|
|
|
cleanup:
|
|
/* If it didn't work, free the streams! */
|
|
for (i = 0; i < num_eps; i++) {
|
|
ep_index = xhci_get_endpoint_index(&eps[i]->desc);
|
|
xhci_free_stream_info(xhci, vdev->eps[ep_index].stream_info);
|
|
vdev->eps[ep_index].stream_info = NULL;
|
|
/* FIXME Unset maxPstreams in endpoint context and
|
|
* update deq ptr to point to normal string ring.
|
|
*/
|
|
vdev->eps[ep_index].ep_state &= ~EP_GETTING_STREAMS;
|
|
vdev->eps[ep_index].ep_state &= ~EP_HAS_STREAMS;
|
|
xhci_endpoint_zero(xhci, vdev, eps[i]);
|
|
}
|
|
xhci_free_command(xhci, config_cmd);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Transition the endpoint from using streams to being a "normal" endpoint
|
|
* without streams.
|
|
*
|
|
* Modify the endpoint context state, submit a configure endpoint command,
|
|
* and free all endpoint rings for streams if that completes successfully.
|
|
*/
|
|
int xhci_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
|
|
struct usb_host_endpoint **eps, unsigned int num_eps,
|
|
gfp_t mem_flags)
|
|
{
|
|
int i, ret;
|
|
struct xhci_hcd *xhci;
|
|
struct xhci_virt_device *vdev;
|
|
struct xhci_command *command;
|
|
unsigned int ep_index;
|
|
unsigned long flags;
|
|
u32 changed_ep_bitmask;
|
|
|
|
xhci = hcd_to_xhci(hcd);
|
|
vdev = xhci->devs[udev->slot_id];
|
|
|
|
/* Set up a configure endpoint command to remove the streams rings */
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
changed_ep_bitmask = xhci_calculate_no_streams_bitmask(xhci,
|
|
udev, eps, num_eps);
|
|
if (changed_ep_bitmask == 0) {
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Use the xhci_command structure from the first endpoint. We may have
|
|
* allocated too many, but the driver may call xhci_free_streams() for
|
|
* each endpoint it grouped into one call to xhci_alloc_streams().
|
|
*/
|
|
ep_index = xhci_get_endpoint_index(&eps[0]->desc);
|
|
command = vdev->eps[ep_index].stream_info->free_streams_command;
|
|
for (i = 0; i < num_eps; i++) {
|
|
struct xhci_ep_ctx *ep_ctx;
|
|
|
|
ep_index = xhci_get_endpoint_index(&eps[i]->desc);
|
|
ep_ctx = xhci_get_ep_ctx(xhci, command->in_ctx, ep_index);
|
|
xhci->devs[udev->slot_id]->eps[ep_index].ep_state |=
|
|
EP_GETTING_NO_STREAMS;
|
|
|
|
xhci_endpoint_copy(xhci, command->in_ctx,
|
|
vdev->out_ctx, ep_index);
|
|
xhci_setup_no_streams_ep_input_ctx(xhci, ep_ctx,
|
|
&vdev->eps[ep_index]);
|
|
}
|
|
xhci_setup_input_ctx_for_config_ep(xhci, command->in_ctx,
|
|
vdev->out_ctx, changed_ep_bitmask, changed_ep_bitmask);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
|
|
/* Issue and wait for the configure endpoint command,
|
|
* which must succeed.
|
|
*/
|
|
ret = xhci_configure_endpoint(xhci, udev, command,
|
|
false, true);
|
|
|
|
/* xHC rejected the configure endpoint command for some reason, so we
|
|
* leave the streams rings intact.
|
|
*/
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
for (i = 0; i < num_eps; i++) {
|
|
ep_index = xhci_get_endpoint_index(&eps[i]->desc);
|
|
xhci_free_stream_info(xhci, vdev->eps[ep_index].stream_info);
|
|
vdev->eps[ep_index].stream_info = NULL;
|
|
/* FIXME Unset maxPstreams in endpoint context and
|
|
* update deq ptr to point to normal string ring.
|
|
*/
|
|
vdev->eps[ep_index].ep_state &= ~EP_GETTING_NO_STREAMS;
|
|
vdev->eps[ep_index].ep_state &= ~EP_HAS_STREAMS;
|
|
}
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Deletes endpoint resources for endpoints that were active before a Reset
|
|
* Device command, or a Disable Slot command. The Reset Device command leaves
|
|
* the control endpoint intact, whereas the Disable Slot command deletes it.
|
|
*
|
|
* Must be called with xhci->lock held.
|
|
*/
|
|
void xhci_free_device_endpoint_resources(struct xhci_hcd *xhci,
|
|
struct xhci_virt_device *virt_dev, bool drop_control_ep)
|
|
{
|
|
int i;
|
|
unsigned int num_dropped_eps = 0;
|
|
unsigned int drop_flags = 0;
|
|
|
|
for (i = (drop_control_ep ? 0 : 1); i < 31; i++) {
|
|
if (virt_dev->eps[i].ring) {
|
|
drop_flags |= 1 << i;
|
|
num_dropped_eps++;
|
|
}
|
|
}
|
|
xhci->num_active_eps -= num_dropped_eps;
|
|
if (num_dropped_eps)
|
|
xhci_dbg(xhci, "Dropped %u ep ctxs, flags = 0x%x, "
|
|
"%u now active.\n",
|
|
num_dropped_eps, drop_flags,
|
|
xhci->num_active_eps);
|
|
}
|
|
|
|
/*
|
|
* This submits a Reset Device Command, which will set the device state to 0,
|
|
* set the device address to 0, and disable all the endpoints except the default
|
|
* control endpoint. The USB core should come back and call
|
|
* xhci_address_device(), and then re-set up the configuration. If this is
|
|
* called because of a usb_reset_and_verify_device(), then the old alternate
|
|
* settings will be re-installed through the normal bandwidth allocation
|
|
* functions.
|
|
*
|
|
* Wait for the Reset Device command to finish. Remove all structures
|
|
* associated with the endpoints that were disabled. Clear the input device
|
|
* structure? Cache the rings? Reset the control endpoint 0 max packet size?
|
|
*
|
|
* If the virt_dev to be reset does not exist or does not match the udev,
|
|
* it means the device is lost, possibly due to the xHC restore error and
|
|
* re-initialization during S3/S4. In this case, call xhci_alloc_dev() to
|
|
* re-allocate the device.
|
|
*/
|
|
int xhci_discover_or_reset_device(struct usb_hcd *hcd, struct usb_device *udev)
|
|
{
|
|
int ret, i;
|
|
unsigned long flags;
|
|
struct xhci_hcd *xhci;
|
|
unsigned int slot_id;
|
|
struct xhci_virt_device *virt_dev;
|
|
struct xhci_command *reset_device_cmd;
|
|
int timeleft;
|
|
int last_freed_endpoint;
|
|
struct xhci_slot_ctx *slot_ctx;
|
|
int old_active_eps = 0;
|
|
|
|
ret = xhci_check_args(hcd, udev, NULL, 0, false, __func__);
|
|
if (ret <= 0)
|
|
return ret;
|
|
xhci = hcd_to_xhci(hcd);
|
|
slot_id = udev->slot_id;
|
|
virt_dev = xhci->devs[slot_id];
|
|
if (!virt_dev) {
|
|
xhci_dbg(xhci, "The device to be reset with slot ID %u does "
|
|
"not exist. Re-allocate the device\n", slot_id);
|
|
ret = xhci_alloc_dev(hcd, udev);
|
|
if (ret == 1)
|
|
return 0;
|
|
else
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (virt_dev->udev != udev) {
|
|
/* If the virt_dev and the udev does not match, this virt_dev
|
|
* may belong to another udev.
|
|
* Re-allocate the device.
|
|
*/
|
|
xhci_dbg(xhci, "The device to be reset with slot ID %u does "
|
|
"not match the udev. Re-allocate the device\n",
|
|
slot_id);
|
|
ret = xhci_alloc_dev(hcd, udev);
|
|
if (ret == 1)
|
|
return 0;
|
|
else
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* If device is not setup, there is no point in resetting it */
|
|
slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->out_ctx);
|
|
if (GET_SLOT_STATE(le32_to_cpu(slot_ctx->dev_state)) ==
|
|
SLOT_STATE_DISABLED)
|
|
return 0;
|
|
|
|
xhci_dbg(xhci, "Resetting device with slot ID %u\n", slot_id);
|
|
/* Allocate the command structure that holds the struct completion.
|
|
* Assume we're in process context, since the normal device reset
|
|
* process has to wait for the device anyway. Storage devices are
|
|
* reset as part of error handling, so use GFP_NOIO instead of
|
|
* GFP_KERNEL.
|
|
*/
|
|
reset_device_cmd = xhci_alloc_command(xhci, false, true, GFP_NOIO);
|
|
if (!reset_device_cmd) {
|
|
xhci_dbg(xhci, "Couldn't allocate command structure.\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Attempt to submit the Reset Device command to the command ring */
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
reset_device_cmd->command_trb = xhci->cmd_ring->enqueue;
|
|
|
|
/* Enqueue pointer can be left pointing to the link TRB,
|
|
* we must handle that
|
|
*/
|
|
if (TRB_TYPE_LINK_LE32(reset_device_cmd->command_trb->link.control))
|
|
reset_device_cmd->command_trb =
|
|
xhci->cmd_ring->enq_seg->next->trbs;
|
|
|
|
list_add_tail(&reset_device_cmd->cmd_list, &virt_dev->cmd_list);
|
|
ret = xhci_queue_reset_device(xhci, slot_id);
|
|
if (ret) {
|
|
xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
|
|
list_del(&reset_device_cmd->cmd_list);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
goto command_cleanup;
|
|
}
|
|
xhci_ring_cmd_db(xhci);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
|
|
/* Wait for the Reset Device command to finish */
|
|
timeleft = wait_for_completion_interruptible_timeout(
|
|
reset_device_cmd->completion,
|
|
USB_CTRL_SET_TIMEOUT);
|
|
if (timeleft <= 0) {
|
|
xhci_warn(xhci, "%s while waiting for reset device command\n",
|
|
timeleft == 0 ? "Timeout" : "Signal");
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
/* The timeout might have raced with the event ring handler, so
|
|
* only delete from the list if the item isn't poisoned.
|
|
*/
|
|
if (reset_device_cmd->cmd_list.next != LIST_POISON1)
|
|
list_del(&reset_device_cmd->cmd_list);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
ret = -ETIME;
|
|
goto command_cleanup;
|
|
}
|
|
|
|
/* The Reset Device command can't fail, according to the 0.95/0.96 spec,
|
|
* unless we tried to reset a slot ID that wasn't enabled,
|
|
* or the device wasn't in the addressed or configured state.
|
|
*/
|
|
ret = reset_device_cmd->status;
|
|
switch (ret) {
|
|
case COMP_EBADSLT: /* 0.95 completion code for bad slot ID */
|
|
case COMP_CTX_STATE: /* 0.96 completion code for same thing */
|
|
xhci_info(xhci, "Can't reset device (slot ID %u) in %s state\n",
|
|
slot_id,
|
|
xhci_get_slot_state(xhci, virt_dev->out_ctx));
|
|
xhci_info(xhci, "Not freeing device rings.\n");
|
|
/* Don't treat this as an error. May change my mind later. */
|
|
ret = 0;
|
|
goto command_cleanup;
|
|
case COMP_SUCCESS:
|
|
xhci_dbg(xhci, "Successful reset device command.\n");
|
|
break;
|
|
default:
|
|
if (xhci_is_vendor_info_code(xhci, ret))
|
|
break;
|
|
xhci_warn(xhci, "Unknown completion code %u for "
|
|
"reset device command.\n", ret);
|
|
ret = -EINVAL;
|
|
goto command_cleanup;
|
|
}
|
|
|
|
/* Free up host controller endpoint resources */
|
|
if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK)) {
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
/* Don't delete the default control endpoint resources */
|
|
xhci_free_device_endpoint_resources(xhci, virt_dev, false);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
}
|
|
|
|
/* Everything but endpoint 0 is disabled, so free or cache the rings. */
|
|
last_freed_endpoint = 1;
|
|
for (i = 1; i < 31; ++i) {
|
|
struct xhci_virt_ep *ep = &virt_dev->eps[i];
|
|
|
|
if (ep->ep_state & EP_HAS_STREAMS) {
|
|
xhci_free_stream_info(xhci, ep->stream_info);
|
|
ep->stream_info = NULL;
|
|
ep->ep_state &= ~EP_HAS_STREAMS;
|
|
}
|
|
|
|
if (ep->ring) {
|
|
xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i);
|
|
last_freed_endpoint = i;
|
|
}
|
|
if (!list_empty(&virt_dev->eps[i].bw_endpoint_list))
|
|
xhci_drop_ep_from_interval_table(xhci,
|
|
&virt_dev->eps[i].bw_info,
|
|
virt_dev->bw_table,
|
|
udev,
|
|
&virt_dev->eps[i],
|
|
virt_dev->tt_info);
|
|
xhci_clear_endpoint_bw_info(&virt_dev->eps[i].bw_info);
|
|
}
|
|
/* If necessary, update the number of active TTs on this root port */
|
|
xhci_update_tt_active_eps(xhci, virt_dev, old_active_eps);
|
|
|
|
xhci_dbg(xhci, "Output context after successful reset device cmd:\n");
|
|
xhci_dbg_ctx(xhci, virt_dev->out_ctx, last_freed_endpoint);
|
|
ret = 0;
|
|
|
|
command_cleanup:
|
|
xhci_free_command(xhci, reset_device_cmd);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* At this point, the struct usb_device is about to go away, the device has
|
|
* disconnected, and all traffic has been stopped and the endpoints have been
|
|
* disabled. Free any HC data structures associated with that device.
|
|
*/
|
|
void xhci_free_dev(struct usb_hcd *hcd, struct usb_device *udev)
|
|
{
|
|
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
|
|
struct xhci_virt_device *virt_dev;
|
|
unsigned long flags;
|
|
u32 state;
|
|
int i, ret;
|
|
|
|
ret = xhci_check_args(hcd, udev, NULL, 0, true, __func__);
|
|
/* If the host is halted due to driver unload, we still need to free the
|
|
* device.
|
|
*/
|
|
if (ret <= 0 && ret != -ENODEV)
|
|
return;
|
|
|
|
virt_dev = xhci->devs[udev->slot_id];
|
|
|
|
/* Stop any wayward timer functions (which may grab the lock) */
|
|
for (i = 0; i < 31; ++i) {
|
|
virt_dev->eps[i].ep_state &= ~EP_HALT_PENDING;
|
|
del_timer_sync(&virt_dev->eps[i].stop_cmd_timer);
|
|
}
|
|
|
|
if (udev->usb2_hw_lpm_enabled) {
|
|
xhci_set_usb2_hardware_lpm(hcd, udev, 0);
|
|
udev->usb2_hw_lpm_enabled = 0;
|
|
}
|
|
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
/* Don't disable the slot if the host controller is dead. */
|
|
state = xhci_readl(xhci, &xhci->op_regs->status);
|
|
if (state == 0xffffffff || (xhci->xhc_state & XHCI_STATE_DYING) ||
|
|
(xhci->xhc_state & XHCI_STATE_HALTED)) {
|
|
xhci_free_virt_device(xhci, udev->slot_id);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
return;
|
|
}
|
|
|
|
if (xhci_queue_slot_control(xhci, TRB_DISABLE_SLOT, udev->slot_id)) {
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
|
|
return;
|
|
}
|
|
xhci_ring_cmd_db(xhci);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
/*
|
|
* Event command completion handler will free any data structures
|
|
* associated with the slot. XXX Can free sleep?
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* Checks if we have enough host controller resources for the default control
|
|
* endpoint.
|
|
*
|
|
* Must be called with xhci->lock held.
|
|
*/
|
|
static int xhci_reserve_host_control_ep_resources(struct xhci_hcd *xhci)
|
|
{
|
|
if (xhci->num_active_eps + 1 > xhci->limit_active_eps) {
|
|
xhci_dbg(xhci, "Not enough ep ctxs: "
|
|
"%u active, need to add 1, limit is %u.\n",
|
|
xhci->num_active_eps, xhci->limit_active_eps);
|
|
return -ENOMEM;
|
|
}
|
|
xhci->num_active_eps += 1;
|
|
xhci_dbg(xhci, "Adding 1 ep ctx, %u now active.\n",
|
|
xhci->num_active_eps);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Returns 0 if the xHC ran out of device slots, the Enable Slot command
|
|
* timed out, or allocating memory failed. Returns 1 on success.
|
|
*/
|
|
int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev)
|
|
{
|
|
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
|
|
unsigned long flags;
|
|
int timeleft;
|
|
int ret;
|
|
union xhci_trb *cmd_trb;
|
|
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
cmd_trb = xhci->cmd_ring->dequeue;
|
|
ret = xhci_queue_slot_control(xhci, TRB_ENABLE_SLOT, 0);
|
|
if (ret) {
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
|
|
return 0;
|
|
}
|
|
xhci_ring_cmd_db(xhci);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
|
|
/* XXX: how much time for xHC slot assignment? */
|
|
timeleft = wait_for_completion_interruptible_timeout(&xhci->addr_dev,
|
|
XHCI_CMD_DEFAULT_TIMEOUT);
|
|
if (timeleft <= 0) {
|
|
xhci_warn(xhci, "%s while waiting for a slot\n",
|
|
timeleft == 0 ? "Timeout" : "Signal");
|
|
/* cancel the enable slot request */
|
|
return xhci_cancel_cmd(xhci, NULL, cmd_trb);
|
|
}
|
|
|
|
if (!xhci->slot_id) {
|
|
xhci_err(xhci, "Error while assigning device slot ID\n");
|
|
return 0;
|
|
}
|
|
|
|
if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK)) {
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
ret = xhci_reserve_host_control_ep_resources(xhci);
|
|
if (ret) {
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
xhci_warn(xhci, "Not enough host resources, "
|
|
"active endpoint contexts = %u\n",
|
|
xhci->num_active_eps);
|
|
goto disable_slot;
|
|
}
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
}
|
|
/* Use GFP_NOIO, since this function can be called from
|
|
* xhci_discover_or_reset_device(), which may be called as part of
|
|
* mass storage driver error handling.
|
|
*/
|
|
if (!xhci_alloc_virt_device(xhci, xhci->slot_id, udev, GFP_NOIO)) {
|
|
xhci_warn(xhci, "Could not allocate xHCI USB device data structures\n");
|
|
goto disable_slot;
|
|
}
|
|
udev->slot_id = xhci->slot_id;
|
|
/* Is this a LS or FS device under a HS hub? */
|
|
/* Hub or peripherial? */
|
|
return 1;
|
|
|
|
disable_slot:
|
|
/* Disable slot, if we can do it without mem alloc */
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
if (!xhci_queue_slot_control(xhci, TRB_DISABLE_SLOT, udev->slot_id))
|
|
xhci_ring_cmd_db(xhci);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Issue an Address Device command (which will issue a SetAddress request to
|
|
* the device).
|
|
* We should be protected by the usb_address0_mutex in khubd's hub_port_init, so
|
|
* we should only issue and wait on one address command at the same time.
|
|
*
|
|
* We add one to the device address issued by the hardware because the USB core
|
|
* uses address 1 for the root hubs (even though they're not really devices).
|
|
*/
|
|
int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev)
|
|
{
|
|
unsigned long flags;
|
|
int timeleft;
|
|
struct xhci_virt_device *virt_dev;
|
|
int ret = 0;
|
|
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
|
|
struct xhci_slot_ctx *slot_ctx;
|
|
struct xhci_input_control_ctx *ctrl_ctx;
|
|
u64 temp_64;
|
|
union xhci_trb *cmd_trb;
|
|
|
|
if (!udev->slot_id) {
|
|
xhci_dbg(xhci, "Bad Slot ID %d\n", udev->slot_id);
|
|
return -EINVAL;
|
|
}
|
|
|
|
virt_dev = xhci->devs[udev->slot_id];
|
|
|
|
if (WARN_ON(!virt_dev)) {
|
|
/*
|
|
* In plug/unplug torture test with an NEC controller,
|
|
* a zero-dereference was observed once due to virt_dev = 0.
|
|
* Print useful debug rather than crash if it is observed again!
|
|
*/
|
|
xhci_warn(xhci, "Virt dev invalid for slot_id 0x%x!\n",
|
|
udev->slot_id);
|
|
return -EINVAL;
|
|
}
|
|
|
|
slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
|
|
/*
|
|
* If this is the first Set Address since device plug-in or
|
|
* virt_device realloaction after a resume with an xHCI power loss,
|
|
* then set up the slot context.
|
|
*/
|
|
if (!slot_ctx->dev_info)
|
|
xhci_setup_addressable_virt_dev(xhci, udev);
|
|
/* Otherwise, update the control endpoint ring enqueue pointer. */
|
|
else
|
|
xhci_copy_ep0_dequeue_into_input_ctx(xhci, udev);
|
|
ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
|
|
ctrl_ctx->add_flags = cpu_to_le32(SLOT_FLAG | EP0_FLAG);
|
|
ctrl_ctx->drop_flags = 0;
|
|
|
|
xhci_dbg(xhci, "Slot ID %d Input Context:\n", udev->slot_id);
|
|
xhci_dbg_ctx(xhci, virt_dev->in_ctx, 2);
|
|
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
cmd_trb = xhci->cmd_ring->dequeue;
|
|
ret = xhci_queue_address_device(xhci, virt_dev->in_ctx->dma,
|
|
udev->slot_id);
|
|
if (ret) {
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
|
|
return ret;
|
|
}
|
|
xhci_ring_cmd_db(xhci);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
|
|
/* ctrl tx can take up to 5 sec; XXX: need more time for xHC? */
|
|
timeleft = wait_for_completion_interruptible_timeout(&xhci->addr_dev,
|
|
XHCI_CMD_DEFAULT_TIMEOUT);
|
|
/* FIXME: From section 4.3.4: "Software shall be responsible for timing
|
|
* the SetAddress() "recovery interval" required by USB and aborting the
|
|
* command on a timeout.
|
|
*/
|
|
if (timeleft <= 0) {
|
|
xhci_warn(xhci, "%s while waiting for address device command\n",
|
|
timeleft == 0 ? "Timeout" : "Signal");
|
|
/* cancel the address device command */
|
|
ret = xhci_cancel_cmd(xhci, NULL, cmd_trb);
|
|
if (ret < 0)
|
|
return ret;
|
|
return -ETIME;
|
|
}
|
|
|
|
switch (virt_dev->cmd_status) {
|
|
case COMP_CTX_STATE:
|
|
case COMP_EBADSLT:
|
|
xhci_err(xhci, "Setup ERROR: address device command for slot %d.\n",
|
|
udev->slot_id);
|
|
ret = -EINVAL;
|
|
break;
|
|
case COMP_TX_ERR:
|
|
dev_warn(&udev->dev, "Device not responding to set address.\n");
|
|
ret = -EPROTO;
|
|
break;
|
|
case COMP_DEV_ERR:
|
|
dev_warn(&udev->dev, "ERROR: Incompatible device for address "
|
|
"device command.\n");
|
|
ret = -ENODEV;
|
|
break;
|
|
case COMP_SUCCESS:
|
|
xhci_dbg(xhci, "Successful Address Device command\n");
|
|
break;
|
|
default:
|
|
xhci_err(xhci, "ERROR: unexpected command completion "
|
|
"code 0x%x.\n", virt_dev->cmd_status);
|
|
xhci_dbg(xhci, "Slot ID %d Output Context:\n", udev->slot_id);
|
|
xhci_dbg_ctx(xhci, virt_dev->out_ctx, 2);
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
temp_64 = xhci_read_64(xhci, &xhci->op_regs->dcbaa_ptr);
|
|
xhci_dbg(xhci, "Op regs DCBAA ptr = %#016llx\n", temp_64);
|
|
xhci_dbg(xhci, "Slot ID %d dcbaa entry @%p = %#016llx\n",
|
|
udev->slot_id,
|
|
&xhci->dcbaa->dev_context_ptrs[udev->slot_id],
|
|
(unsigned long long)
|
|
le64_to_cpu(xhci->dcbaa->dev_context_ptrs[udev->slot_id]));
|
|
xhci_dbg(xhci, "Output Context DMA address = %#08llx\n",
|
|
(unsigned long long)virt_dev->out_ctx->dma);
|
|
xhci_dbg(xhci, "Slot ID %d Input Context:\n", udev->slot_id);
|
|
xhci_dbg_ctx(xhci, virt_dev->in_ctx, 2);
|
|
xhci_dbg(xhci, "Slot ID %d Output Context:\n", udev->slot_id);
|
|
xhci_dbg_ctx(xhci, virt_dev->out_ctx, 2);
|
|
/*
|
|
* USB core uses address 1 for the roothubs, so we add one to the
|
|
* address given back to us by the HC.
|
|
*/
|
|
slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->out_ctx);
|
|
/* Use kernel assigned address for devices; store xHC assigned
|
|
* address locally. */
|
|
virt_dev->address = (le32_to_cpu(slot_ctx->dev_state) & DEV_ADDR_MASK)
|
|
+ 1;
|
|
/* Zero the input context control for later use */
|
|
ctrl_ctx->add_flags = 0;
|
|
ctrl_ctx->drop_flags = 0;
|
|
|
|
xhci_dbg(xhci, "Internal device address = %d\n", virt_dev->address);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_USB_SUSPEND
|
|
|
|
/* BESL to HIRD Encoding array for USB2 LPM */
|
|
static int xhci_besl_encoding[16] = {125, 150, 200, 300, 400, 500, 1000, 2000,
|
|
3000, 4000, 5000, 6000, 7000, 8000, 9000, 10000};
|
|
|
|
/* Calculate HIRD/BESL for USB2 PORTPMSC*/
|
|
static int xhci_calculate_hird_besl(struct xhci_hcd *xhci,
|
|
struct usb_device *udev)
|
|
{
|
|
int u2del, besl, besl_host;
|
|
int besl_device = 0;
|
|
u32 field;
|
|
|
|
u2del = HCS_U2_LATENCY(xhci->hcs_params3);
|
|
field = le32_to_cpu(udev->bos->ext_cap->bmAttributes);
|
|
|
|
if (field & USB_BESL_SUPPORT) {
|
|
for (besl_host = 0; besl_host < 16; besl_host++) {
|
|
if (xhci_besl_encoding[besl_host] >= u2del)
|
|
break;
|
|
}
|
|
/* Use baseline BESL value as default */
|
|
if (field & USB_BESL_BASELINE_VALID)
|
|
besl_device = USB_GET_BESL_BASELINE(field);
|
|
else if (field & USB_BESL_DEEP_VALID)
|
|
besl_device = USB_GET_BESL_DEEP(field);
|
|
} else {
|
|
if (u2del <= 50)
|
|
besl_host = 0;
|
|
else
|
|
besl_host = (u2del - 51) / 75 + 1;
|
|
}
|
|
|
|
besl = besl_host + besl_device;
|
|
if (besl > 15)
|
|
besl = 15;
|
|
|
|
return besl;
|
|
}
|
|
|
|
static int xhci_usb2_software_lpm_test(struct usb_hcd *hcd,
|
|
struct usb_device *udev)
|
|
{
|
|
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
|
|
struct dev_info *dev_info;
|
|
__le32 __iomem **port_array;
|
|
__le32 __iomem *addr, *pm_addr;
|
|
u32 temp, dev_id;
|
|
unsigned int port_num;
|
|
unsigned long flags;
|
|
int hird;
|
|
int ret;
|
|
|
|
if (hcd->speed == HCD_USB3 || !xhci->sw_lpm_support ||
|
|
!udev->lpm_capable)
|
|
return -EINVAL;
|
|
|
|
/* we only support lpm for non-hub device connected to root hub yet */
|
|
if (!udev->parent || udev->parent->parent ||
|
|
udev->descriptor.bDeviceClass == USB_CLASS_HUB)
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
|
|
/* Look for devices in lpm_failed_devs list */
|
|
dev_id = le16_to_cpu(udev->descriptor.idVendor) << 16 |
|
|
le16_to_cpu(udev->descriptor.idProduct);
|
|
list_for_each_entry(dev_info, &xhci->lpm_failed_devs, list) {
|
|
if (dev_info->dev_id == dev_id) {
|
|
ret = -EINVAL;
|
|
goto finish;
|
|
}
|
|
}
|
|
|
|
port_array = xhci->usb2_ports;
|
|
port_num = udev->portnum - 1;
|
|
|
|
if (port_num > HCS_MAX_PORTS(xhci->hcs_params1)) {
|
|
xhci_dbg(xhci, "invalid port number %d\n", udev->portnum);
|
|
ret = -EINVAL;
|
|
goto finish;
|
|
}
|
|
|
|
/*
|
|
* Test USB 2.0 software LPM.
|
|
* FIXME: some xHCI 1.0 hosts may implement a new register to set up
|
|
* hardware-controlled USB 2.0 LPM. See section 5.4.11 and 4.23.5.1.1.1
|
|
* in the June 2011 errata release.
|
|
*/
|
|
xhci_dbg(xhci, "test port %d software LPM\n", port_num);
|
|
/*
|
|
* Set L1 Device Slot and HIRD/BESL.
|
|
* Check device's USB 2.0 extension descriptor to determine whether
|
|
* HIRD or BESL shoule be used. See USB2.0 LPM errata.
|
|
*/
|
|
pm_addr = port_array[port_num] + 1;
|
|
hird = xhci_calculate_hird_besl(xhci, udev);
|
|
temp = PORT_L1DS(udev->slot_id) | PORT_HIRD(hird);
|
|
xhci_writel(xhci, temp, pm_addr);
|
|
|
|
/* Set port link state to U2(L1) */
|
|
addr = port_array[port_num];
|
|
xhci_set_link_state(xhci, port_array, port_num, XDEV_U2);
|
|
|
|
/* wait for ACK */
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
msleep(10);
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
|
|
/* Check L1 Status */
|
|
ret = xhci_handshake(xhci, pm_addr,
|
|
PORT_L1S_MASK, PORT_L1S_SUCCESS, 125);
|
|
if (ret != -ETIMEDOUT) {
|
|
/* enter L1 successfully */
|
|
temp = xhci_readl(xhci, addr);
|
|
xhci_dbg(xhci, "port %d entered L1 state, port status 0x%x\n",
|
|
port_num, temp);
|
|
ret = 0;
|
|
} else {
|
|
temp = xhci_readl(xhci, pm_addr);
|
|
xhci_dbg(xhci, "port %d software lpm failed, L1 status %d\n",
|
|
port_num, temp & PORT_L1S_MASK);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/* Resume the port */
|
|
xhci_set_link_state(xhci, port_array, port_num, XDEV_U0);
|
|
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
msleep(10);
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
|
|
/* Clear PLC */
|
|
xhci_test_and_clear_bit(xhci, port_array, port_num, PORT_PLC);
|
|
|
|
/* Check PORTSC to make sure the device is in the right state */
|
|
if (!ret) {
|
|
temp = xhci_readl(xhci, addr);
|
|
xhci_dbg(xhci, "resumed port %d status 0x%x\n", port_num, temp);
|
|
if (!(temp & PORT_CONNECT) || !(temp & PORT_PE) ||
|
|
(temp & PORT_PLS_MASK) != XDEV_U0) {
|
|
xhci_dbg(xhci, "port L1 resume fail\n");
|
|
ret = -EINVAL;
|
|
}
|
|
}
|
|
|
|
if (ret) {
|
|
/* Insert dev to lpm_failed_devs list */
|
|
xhci_warn(xhci, "device LPM test failed, may disconnect and "
|
|
"re-enumerate\n");
|
|
dev_info = kzalloc(sizeof(struct dev_info), GFP_ATOMIC);
|
|
if (!dev_info) {
|
|
ret = -ENOMEM;
|
|
goto finish;
|
|
}
|
|
dev_info->dev_id = dev_id;
|
|
INIT_LIST_HEAD(&dev_info->list);
|
|
list_add(&dev_info->list, &xhci->lpm_failed_devs);
|
|
} else {
|
|
xhci_ring_device(xhci, udev->slot_id);
|
|
}
|
|
|
|
finish:
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
return ret;
|
|
}
|
|
|
|
int xhci_set_usb2_hardware_lpm(struct usb_hcd *hcd,
|
|
struct usb_device *udev, int enable)
|
|
{
|
|
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
|
|
__le32 __iomem **port_array;
|
|
__le32 __iomem *pm_addr;
|
|
u32 temp;
|
|
unsigned int port_num;
|
|
unsigned long flags;
|
|
int hird;
|
|
|
|
if (hcd->speed == HCD_USB3 || !xhci->hw_lpm_support ||
|
|
!udev->lpm_capable)
|
|
return -EPERM;
|
|
|
|
if (!udev->parent || udev->parent->parent ||
|
|
udev->descriptor.bDeviceClass == USB_CLASS_HUB)
|
|
return -EPERM;
|
|
|
|
if (udev->usb2_hw_lpm_capable != 1)
|
|
return -EPERM;
|
|
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
|
|
port_array = xhci->usb2_ports;
|
|
port_num = udev->portnum - 1;
|
|
pm_addr = port_array[port_num] + 1;
|
|
temp = xhci_readl(xhci, pm_addr);
|
|
|
|
xhci_dbg(xhci, "%s port %d USB2 hardware LPM\n",
|
|
enable ? "enable" : "disable", port_num);
|
|
|
|
hird = xhci_calculate_hird_besl(xhci, udev);
|
|
|
|
if (enable) {
|
|
temp &= ~PORT_HIRD_MASK;
|
|
temp |= PORT_HIRD(hird) | PORT_RWE;
|
|
xhci_writel(xhci, temp, pm_addr);
|
|
temp = xhci_readl(xhci, pm_addr);
|
|
temp |= PORT_HLE;
|
|
xhci_writel(xhci, temp, pm_addr);
|
|
} else {
|
|
temp &= ~(PORT_HLE | PORT_RWE | PORT_HIRD_MASK);
|
|
xhci_writel(xhci, temp, pm_addr);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
int xhci_update_device(struct usb_hcd *hcd, struct usb_device *udev)
|
|
{
|
|
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
|
|
int ret;
|
|
|
|
ret = xhci_usb2_software_lpm_test(hcd, udev);
|
|
if (!ret) {
|
|
xhci_dbg(xhci, "software LPM test succeed\n");
|
|
if (xhci->hw_lpm_support == 1) {
|
|
udev->usb2_hw_lpm_capable = 1;
|
|
ret = xhci_set_usb2_hardware_lpm(hcd, udev, 1);
|
|
if (!ret)
|
|
udev->usb2_hw_lpm_enabled = 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
|
|
int xhci_set_usb2_hardware_lpm(struct usb_hcd *hcd,
|
|
struct usb_device *udev, int enable)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int xhci_update_device(struct usb_hcd *hcd, struct usb_device *udev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_USB_SUSPEND */
|
|
|
|
/*---------------------- USB 3.0 Link PM functions ------------------------*/
|
|
|
|
#ifdef CONFIG_PM
|
|
/* Service interval in nanoseconds = 2^(bInterval - 1) * 125us * 1000ns / 1us */
|
|
static unsigned long long xhci_service_interval_to_ns(
|
|
struct usb_endpoint_descriptor *desc)
|
|
{
|
|
return (1ULL << (desc->bInterval - 1)) * 125 * 1000;
|
|
}
|
|
|
|
static u16 xhci_get_timeout_no_hub_lpm(struct usb_device *udev,
|
|
enum usb3_link_state state)
|
|
{
|
|
unsigned long long sel;
|
|
unsigned long long pel;
|
|
unsigned int max_sel_pel;
|
|
char *state_name;
|
|
|
|
switch (state) {
|
|
case USB3_LPM_U1:
|
|
/* Convert SEL and PEL stored in nanoseconds to microseconds */
|
|
sel = DIV_ROUND_UP(udev->u1_params.sel, 1000);
|
|
pel = DIV_ROUND_UP(udev->u1_params.pel, 1000);
|
|
max_sel_pel = USB3_LPM_MAX_U1_SEL_PEL;
|
|
state_name = "U1";
|
|
break;
|
|
case USB3_LPM_U2:
|
|
sel = DIV_ROUND_UP(udev->u2_params.sel, 1000);
|
|
pel = DIV_ROUND_UP(udev->u2_params.pel, 1000);
|
|
max_sel_pel = USB3_LPM_MAX_U2_SEL_PEL;
|
|
state_name = "U2";
|
|
break;
|
|
default:
|
|
dev_warn(&udev->dev, "%s: Can't get timeout for non-U1 or U2 state.\n",
|
|
__func__);
|
|
return USB3_LPM_DISABLED;
|
|
}
|
|
|
|
if (sel <= max_sel_pel && pel <= max_sel_pel)
|
|
return USB3_LPM_DEVICE_INITIATED;
|
|
|
|
if (sel > max_sel_pel)
|
|
dev_dbg(&udev->dev, "Device-initiated %s disabled "
|
|
"due to long SEL %llu ms\n",
|
|
state_name, sel);
|
|
else
|
|
dev_dbg(&udev->dev, "Device-initiated %s disabled "
|
|
"due to long PEL %llu\n ms",
|
|
state_name, pel);
|
|
return USB3_LPM_DISABLED;
|
|
}
|
|
|
|
/* Returns the hub-encoded U1 timeout value.
|
|
* The U1 timeout should be the maximum of the following values:
|
|
* - For control endpoints, U1 system exit latency (SEL) * 3
|
|
* - For bulk endpoints, U1 SEL * 5
|
|
* - For interrupt endpoints:
|
|
* - Notification EPs, U1 SEL * 3
|
|
* - Periodic EPs, max(105% of bInterval, U1 SEL * 2)
|
|
* - For isochronous endpoints, max(105% of bInterval, U1 SEL * 2)
|
|
*/
|
|
static u16 xhci_calculate_intel_u1_timeout(struct usb_device *udev,
|
|
struct usb_endpoint_descriptor *desc)
|
|
{
|
|
unsigned long long timeout_ns;
|
|
int ep_type;
|
|
int intr_type;
|
|
|
|
ep_type = usb_endpoint_type(desc);
|
|
switch (ep_type) {
|
|
case USB_ENDPOINT_XFER_CONTROL:
|
|
timeout_ns = udev->u1_params.sel * 3;
|
|
break;
|
|
case USB_ENDPOINT_XFER_BULK:
|
|
timeout_ns = udev->u1_params.sel * 5;
|
|
break;
|
|
case USB_ENDPOINT_XFER_INT:
|
|
intr_type = usb_endpoint_interrupt_type(desc);
|
|
if (intr_type == USB_ENDPOINT_INTR_NOTIFICATION) {
|
|
timeout_ns = udev->u1_params.sel * 3;
|
|
break;
|
|
}
|
|
/* Otherwise the calculation is the same as isoc eps */
|
|
case USB_ENDPOINT_XFER_ISOC:
|
|
timeout_ns = xhci_service_interval_to_ns(desc);
|
|
timeout_ns = DIV_ROUND_UP_ULL(timeout_ns * 105, 100);
|
|
if (timeout_ns < udev->u1_params.sel * 2)
|
|
timeout_ns = udev->u1_params.sel * 2;
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
/* The U1 timeout is encoded in 1us intervals. */
|
|
timeout_ns = DIV_ROUND_UP_ULL(timeout_ns, 1000);
|
|
/* Don't return a timeout of zero, because that's USB3_LPM_DISABLED. */
|
|
if (timeout_ns == USB3_LPM_DISABLED)
|
|
timeout_ns++;
|
|
|
|
/* If the necessary timeout value is bigger than what we can set in the
|
|
* USB 3.0 hub, we have to disable hub-initiated U1.
|
|
*/
|
|
if (timeout_ns <= USB3_LPM_U1_MAX_TIMEOUT)
|
|
return timeout_ns;
|
|
dev_dbg(&udev->dev, "Hub-initiated U1 disabled "
|
|
"due to long timeout %llu ms\n", timeout_ns);
|
|
return xhci_get_timeout_no_hub_lpm(udev, USB3_LPM_U1);
|
|
}
|
|
|
|
/* Returns the hub-encoded U2 timeout value.
|
|
* The U2 timeout should be the maximum of:
|
|
* - 10 ms (to avoid the bandwidth impact on the scheduler)
|
|
* - largest bInterval of any active periodic endpoint (to avoid going
|
|
* into lower power link states between intervals).
|
|
* - the U2 Exit Latency of the device
|
|
*/
|
|
static u16 xhci_calculate_intel_u2_timeout(struct usb_device *udev,
|
|
struct usb_endpoint_descriptor *desc)
|
|
{
|
|
unsigned long long timeout_ns;
|
|
unsigned long long u2_del_ns;
|
|
|
|
timeout_ns = 10 * 1000 * 1000;
|
|
|
|
if ((usb_endpoint_xfer_int(desc) || usb_endpoint_xfer_isoc(desc)) &&
|
|
(xhci_service_interval_to_ns(desc) > timeout_ns))
|
|
timeout_ns = xhci_service_interval_to_ns(desc);
|
|
|
|
u2_del_ns = le16_to_cpu(udev->bos->ss_cap->bU2DevExitLat) * 1000ULL;
|
|
if (u2_del_ns > timeout_ns)
|
|
timeout_ns = u2_del_ns;
|
|
|
|
/* The U2 timeout is encoded in 256us intervals */
|
|
timeout_ns = DIV_ROUND_UP_ULL(timeout_ns, 256 * 1000);
|
|
/* If the necessary timeout value is bigger than what we can set in the
|
|
* USB 3.0 hub, we have to disable hub-initiated U2.
|
|
*/
|
|
if (timeout_ns <= USB3_LPM_U2_MAX_TIMEOUT)
|
|
return timeout_ns;
|
|
dev_dbg(&udev->dev, "Hub-initiated U2 disabled "
|
|
"due to long timeout %llu ms\n", timeout_ns);
|
|
return xhci_get_timeout_no_hub_lpm(udev, USB3_LPM_U2);
|
|
}
|
|
|
|
static u16 xhci_call_host_update_timeout_for_endpoint(struct xhci_hcd *xhci,
|
|
struct usb_device *udev,
|
|
struct usb_endpoint_descriptor *desc,
|
|
enum usb3_link_state state,
|
|
u16 *timeout)
|
|
{
|
|
if (state == USB3_LPM_U1) {
|
|
if (xhci->quirks & XHCI_INTEL_HOST)
|
|
return xhci_calculate_intel_u1_timeout(udev, desc);
|
|
} else {
|
|
if (xhci->quirks & XHCI_INTEL_HOST)
|
|
return xhci_calculate_intel_u2_timeout(udev, desc);
|
|
}
|
|
|
|
return USB3_LPM_DISABLED;
|
|
}
|
|
|
|
static int xhci_update_timeout_for_endpoint(struct xhci_hcd *xhci,
|
|
struct usb_device *udev,
|
|
struct usb_endpoint_descriptor *desc,
|
|
enum usb3_link_state state,
|
|
u16 *timeout)
|
|
{
|
|
u16 alt_timeout;
|
|
|
|
alt_timeout = xhci_call_host_update_timeout_for_endpoint(xhci, udev,
|
|
desc, state, timeout);
|
|
|
|
/* If we found we can't enable hub-initiated LPM, or
|
|
* the U1 or U2 exit latency was too high to allow
|
|
* device-initiated LPM as well, just stop searching.
|
|
*/
|
|
if (alt_timeout == USB3_LPM_DISABLED ||
|
|
alt_timeout == USB3_LPM_DEVICE_INITIATED) {
|
|
*timeout = alt_timeout;
|
|
return -E2BIG;
|
|
}
|
|
if (alt_timeout > *timeout)
|
|
*timeout = alt_timeout;
|
|
return 0;
|
|
}
|
|
|
|
static int xhci_update_timeout_for_interface(struct xhci_hcd *xhci,
|
|
struct usb_device *udev,
|
|
struct usb_host_interface *alt,
|
|
enum usb3_link_state state,
|
|
u16 *timeout)
|
|
{
|
|
int j;
|
|
|
|
for (j = 0; j < alt->desc.bNumEndpoints; j++) {
|
|
if (xhci_update_timeout_for_endpoint(xhci, udev,
|
|
&alt->endpoint[j].desc, state, timeout))
|
|
return -E2BIG;
|
|
continue;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int xhci_check_intel_tier_policy(struct usb_device *udev,
|
|
enum usb3_link_state state)
|
|
{
|
|
struct usb_device *parent;
|
|
unsigned int num_hubs;
|
|
|
|
if (state == USB3_LPM_U2)
|
|
return 0;
|
|
|
|
/* Don't enable U1 if the device is on a 2nd tier hub or lower. */
|
|
for (parent = udev->parent, num_hubs = 0; parent->parent;
|
|
parent = parent->parent)
|
|
num_hubs++;
|
|
|
|
if (num_hubs < 2)
|
|
return 0;
|
|
|
|
dev_dbg(&udev->dev, "Disabling U1 link state for device"
|
|
" below second-tier hub.\n");
|
|
dev_dbg(&udev->dev, "Plug device into first-tier hub "
|
|
"to decrease power consumption.\n");
|
|
return -E2BIG;
|
|
}
|
|
|
|
static int xhci_check_tier_policy(struct xhci_hcd *xhci,
|
|
struct usb_device *udev,
|
|
enum usb3_link_state state)
|
|
{
|
|
if (xhci->quirks & XHCI_INTEL_HOST)
|
|
return xhci_check_intel_tier_policy(udev, state);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Returns the U1 or U2 timeout that should be enabled.
|
|
* If the tier check or timeout setting functions return with a non-zero exit
|
|
* code, that means the timeout value has been finalized and we shouldn't look
|
|
* at any more endpoints.
|
|
*/
|
|
static u16 xhci_calculate_lpm_timeout(struct usb_hcd *hcd,
|
|
struct usb_device *udev, enum usb3_link_state state)
|
|
{
|
|
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
|
|
struct usb_host_config *config;
|
|
char *state_name;
|
|
int i;
|
|
u16 timeout = USB3_LPM_DISABLED;
|
|
|
|
if (state == USB3_LPM_U1)
|
|
state_name = "U1";
|
|
else if (state == USB3_LPM_U2)
|
|
state_name = "U2";
|
|
else {
|
|
dev_warn(&udev->dev, "Can't enable unknown link state %i\n",
|
|
state);
|
|
return timeout;
|
|
}
|
|
|
|
if (xhci_check_tier_policy(xhci, udev, state) < 0)
|
|
return timeout;
|
|
|
|
/* Gather some information about the currently installed configuration
|
|
* and alternate interface settings.
|
|
*/
|
|
if (xhci_update_timeout_for_endpoint(xhci, udev, &udev->ep0.desc,
|
|
state, &timeout))
|
|
return timeout;
|
|
|
|
config = udev->actconfig;
|
|
if (!config)
|
|
return timeout;
|
|
|
|
for (i = 0; i < USB_MAXINTERFACES; i++) {
|
|
struct usb_driver *driver;
|
|
struct usb_interface *intf = config->interface[i];
|
|
|
|
if (!intf)
|
|
continue;
|
|
|
|
/* Check if any currently bound drivers want hub-initiated LPM
|
|
* disabled.
|
|
*/
|
|
if (intf->dev.driver) {
|
|
driver = to_usb_driver(intf->dev.driver);
|
|
if (driver && driver->disable_hub_initiated_lpm) {
|
|
dev_dbg(&udev->dev, "Hub-initiated %s disabled "
|
|
"at request of driver %s\n",
|
|
state_name, driver->name);
|
|
return xhci_get_timeout_no_hub_lpm(udev, state);
|
|
}
|
|
}
|
|
|
|
/* Not sure how this could happen... */
|
|
if (!intf->cur_altsetting)
|
|
continue;
|
|
|
|
if (xhci_update_timeout_for_interface(xhci, udev,
|
|
intf->cur_altsetting,
|
|
state, &timeout))
|
|
return timeout;
|
|
}
|
|
return timeout;
|
|
}
|
|
|
|
/*
|
|
* Issue an Evaluate Context command to change the Maximum Exit Latency in the
|
|
* slot context. If that succeeds, store the new MEL in the xhci_virt_device.
|
|
*/
|
|
static int xhci_change_max_exit_latency(struct xhci_hcd *xhci,
|
|
struct usb_device *udev, u16 max_exit_latency)
|
|
{
|
|
struct xhci_virt_device *virt_dev;
|
|
struct xhci_command *command;
|
|
struct xhci_input_control_ctx *ctrl_ctx;
|
|
struct xhci_slot_ctx *slot_ctx;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
if (max_exit_latency == xhci->devs[udev->slot_id]->current_mel) {
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
/* Attempt to issue an Evaluate Context command to change the MEL. */
|
|
virt_dev = xhci->devs[udev->slot_id];
|
|
command = xhci->lpm_command;
|
|
xhci_slot_copy(xhci, command->in_ctx, virt_dev->out_ctx);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
|
|
ctrl_ctx = xhci_get_input_control_ctx(xhci, command->in_ctx);
|
|
ctrl_ctx->add_flags |= cpu_to_le32(SLOT_FLAG);
|
|
slot_ctx = xhci_get_slot_ctx(xhci, command->in_ctx);
|
|
slot_ctx->dev_info2 &= cpu_to_le32(~((u32) MAX_EXIT));
|
|
slot_ctx->dev_info2 |= cpu_to_le32(max_exit_latency);
|
|
|
|
xhci_dbg(xhci, "Set up evaluate context for LPM MEL change.\n");
|
|
xhci_dbg(xhci, "Slot %u Input Context:\n", udev->slot_id);
|
|
xhci_dbg_ctx(xhci, command->in_ctx, 0);
|
|
|
|
/* Issue and wait for the evaluate context command. */
|
|
ret = xhci_configure_endpoint(xhci, udev, command,
|
|
true, true);
|
|
xhci_dbg(xhci, "Slot %u Output Context:\n", udev->slot_id);
|
|
xhci_dbg_ctx(xhci, virt_dev->out_ctx, 0);
|
|
|
|
if (!ret) {
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
virt_dev->current_mel = max_exit_latency;
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int calculate_max_exit_latency(struct usb_device *udev,
|
|
enum usb3_link_state state_changed,
|
|
u16 hub_encoded_timeout)
|
|
{
|
|
unsigned long long u1_mel_us = 0;
|
|
unsigned long long u2_mel_us = 0;
|
|
unsigned long long mel_us = 0;
|
|
bool disabling_u1;
|
|
bool disabling_u2;
|
|
bool enabling_u1;
|
|
bool enabling_u2;
|
|
|
|
disabling_u1 = (state_changed == USB3_LPM_U1 &&
|
|
hub_encoded_timeout == USB3_LPM_DISABLED);
|
|
disabling_u2 = (state_changed == USB3_LPM_U2 &&
|
|
hub_encoded_timeout == USB3_LPM_DISABLED);
|
|
|
|
enabling_u1 = (state_changed == USB3_LPM_U1 &&
|
|
hub_encoded_timeout != USB3_LPM_DISABLED);
|
|
enabling_u2 = (state_changed == USB3_LPM_U2 &&
|
|
hub_encoded_timeout != USB3_LPM_DISABLED);
|
|
|
|
/* If U1 was already enabled and we're not disabling it,
|
|
* or we're going to enable U1, account for the U1 max exit latency.
|
|
*/
|
|
if ((udev->u1_params.timeout != USB3_LPM_DISABLED && !disabling_u1) ||
|
|
enabling_u1)
|
|
u1_mel_us = DIV_ROUND_UP(udev->u1_params.mel, 1000);
|
|
if ((udev->u2_params.timeout != USB3_LPM_DISABLED && !disabling_u2) ||
|
|
enabling_u2)
|
|
u2_mel_us = DIV_ROUND_UP(udev->u2_params.mel, 1000);
|
|
|
|
if (u1_mel_us > u2_mel_us)
|
|
mel_us = u1_mel_us;
|
|
else
|
|
mel_us = u2_mel_us;
|
|
/* xHCI host controller max exit latency field is only 16 bits wide. */
|
|
if (mel_us > MAX_EXIT) {
|
|
dev_warn(&udev->dev, "Link PM max exit latency of %lluus "
|
|
"is too big.\n", mel_us);
|
|
return -E2BIG;
|
|
}
|
|
return mel_us;
|
|
}
|
|
|
|
/* Returns the USB3 hub-encoded value for the U1/U2 timeout. */
|
|
int xhci_enable_usb3_lpm_timeout(struct usb_hcd *hcd,
|
|
struct usb_device *udev, enum usb3_link_state state)
|
|
{
|
|
struct xhci_hcd *xhci;
|
|
u16 hub_encoded_timeout;
|
|
int mel;
|
|
int ret;
|
|
|
|
xhci = hcd_to_xhci(hcd);
|
|
/* The LPM timeout values are pretty host-controller specific, so don't
|
|
* enable hub-initiated timeouts unless the vendor has provided
|
|
* information about their timeout algorithm.
|
|
*/
|
|
if (!xhci || !(xhci->quirks & XHCI_LPM_SUPPORT) ||
|
|
!xhci->devs[udev->slot_id])
|
|
return USB3_LPM_DISABLED;
|
|
|
|
hub_encoded_timeout = xhci_calculate_lpm_timeout(hcd, udev, state);
|
|
mel = calculate_max_exit_latency(udev, state, hub_encoded_timeout);
|
|
if (mel < 0) {
|
|
/* Max Exit Latency is too big, disable LPM. */
|
|
hub_encoded_timeout = USB3_LPM_DISABLED;
|
|
mel = 0;
|
|
}
|
|
|
|
ret = xhci_change_max_exit_latency(xhci, udev, mel);
|
|
if (ret)
|
|
return ret;
|
|
return hub_encoded_timeout;
|
|
}
|
|
|
|
int xhci_disable_usb3_lpm_timeout(struct usb_hcd *hcd,
|
|
struct usb_device *udev, enum usb3_link_state state)
|
|
{
|
|
struct xhci_hcd *xhci;
|
|
u16 mel;
|
|
int ret;
|
|
|
|
xhci = hcd_to_xhci(hcd);
|
|
if (!xhci || !(xhci->quirks & XHCI_LPM_SUPPORT) ||
|
|
!xhci->devs[udev->slot_id])
|
|
return 0;
|
|
|
|
mel = calculate_max_exit_latency(udev, state, USB3_LPM_DISABLED);
|
|
ret = xhci_change_max_exit_latency(xhci, udev, mel);
|
|
if (ret)
|
|
return ret;
|
|
return 0;
|
|
}
|
|
#else /* CONFIG_PM */
|
|
|
|
int xhci_enable_usb3_lpm_timeout(struct usb_hcd *hcd,
|
|
struct usb_device *udev, enum usb3_link_state state)
|
|
{
|
|
return USB3_LPM_DISABLED;
|
|
}
|
|
|
|
int xhci_disable_usb3_lpm_timeout(struct usb_hcd *hcd,
|
|
struct usb_device *udev, enum usb3_link_state state)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_PM */
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* Once a hub descriptor is fetched for a device, we need to update the xHC's
|
|
* internal data structures for the device.
|
|
*/
|
|
int xhci_update_hub_device(struct usb_hcd *hcd, struct usb_device *hdev,
|
|
struct usb_tt *tt, gfp_t mem_flags)
|
|
{
|
|
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
|
|
struct xhci_virt_device *vdev;
|
|
struct xhci_command *config_cmd;
|
|
struct xhci_input_control_ctx *ctrl_ctx;
|
|
struct xhci_slot_ctx *slot_ctx;
|
|
unsigned long flags;
|
|
unsigned think_time;
|
|
int ret;
|
|
|
|
/* Ignore root hubs */
|
|
if (!hdev->parent)
|
|
return 0;
|
|
|
|
vdev = xhci->devs[hdev->slot_id];
|
|
if (!vdev) {
|
|
xhci_warn(xhci, "Cannot update hub desc for unknown device.\n");
|
|
return -EINVAL;
|
|
}
|
|
config_cmd = xhci_alloc_command(xhci, true, true, mem_flags);
|
|
if (!config_cmd) {
|
|
xhci_dbg(xhci, "Could not allocate xHCI command structure.\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
if (hdev->speed == USB_SPEED_HIGH &&
|
|
xhci_alloc_tt_info(xhci, vdev, hdev, tt, GFP_ATOMIC)) {
|
|
xhci_dbg(xhci, "Could not allocate xHCI TT structure.\n");
|
|
xhci_free_command(xhci, config_cmd);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
xhci_slot_copy(xhci, config_cmd->in_ctx, vdev->out_ctx);
|
|
ctrl_ctx = xhci_get_input_control_ctx(xhci, config_cmd->in_ctx);
|
|
ctrl_ctx->add_flags |= cpu_to_le32(SLOT_FLAG);
|
|
slot_ctx = xhci_get_slot_ctx(xhci, config_cmd->in_ctx);
|
|
slot_ctx->dev_info |= cpu_to_le32(DEV_HUB);
|
|
if (tt->multi)
|
|
slot_ctx->dev_info |= cpu_to_le32(DEV_MTT);
|
|
if (xhci->hci_version > 0x95) {
|
|
xhci_dbg(xhci, "xHCI version %x needs hub "
|
|
"TT think time and number of ports\n",
|
|
(unsigned int) xhci->hci_version);
|
|
slot_ctx->dev_info2 |= cpu_to_le32(XHCI_MAX_PORTS(hdev->maxchild));
|
|
/* Set TT think time - convert from ns to FS bit times.
|
|
* 0 = 8 FS bit times, 1 = 16 FS bit times,
|
|
* 2 = 24 FS bit times, 3 = 32 FS bit times.
|
|
*
|
|
* xHCI 1.0: this field shall be 0 if the device is not a
|
|
* High-spped hub.
|
|
*/
|
|
think_time = tt->think_time;
|
|
if (think_time != 0)
|
|
think_time = (think_time / 666) - 1;
|
|
if (xhci->hci_version < 0x100 || hdev->speed == USB_SPEED_HIGH)
|
|
slot_ctx->tt_info |=
|
|
cpu_to_le32(TT_THINK_TIME(think_time));
|
|
} else {
|
|
xhci_dbg(xhci, "xHCI version %x doesn't need hub "
|
|
"TT think time or number of ports\n",
|
|
(unsigned int) xhci->hci_version);
|
|
}
|
|
slot_ctx->dev_state = 0;
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
|
|
xhci_dbg(xhci, "Set up %s for hub device.\n",
|
|
(xhci->hci_version > 0x95) ?
|
|
"configure endpoint" : "evaluate context");
|
|
xhci_dbg(xhci, "Slot %u Input Context:\n", hdev->slot_id);
|
|
xhci_dbg_ctx(xhci, config_cmd->in_ctx, 0);
|
|
|
|
/* Issue and wait for the configure endpoint or
|
|
* evaluate context command.
|
|
*/
|
|
if (xhci->hci_version > 0x95)
|
|
ret = xhci_configure_endpoint(xhci, hdev, config_cmd,
|
|
false, false);
|
|
else
|
|
ret = xhci_configure_endpoint(xhci, hdev, config_cmd,
|
|
true, false);
|
|
|
|
xhci_dbg(xhci, "Slot %u Output Context:\n", hdev->slot_id);
|
|
xhci_dbg_ctx(xhci, vdev->out_ctx, 0);
|
|
|
|
xhci_free_command(xhci, config_cmd);
|
|
return ret;
|
|
}
|
|
|
|
int xhci_get_frame(struct usb_hcd *hcd)
|
|
{
|
|
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
|
|
/* EHCI mods by the periodic size. Why? */
|
|
return xhci_readl(xhci, &xhci->run_regs->microframe_index) >> 3;
|
|
}
|
|
|
|
int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
|
|
{
|
|
struct xhci_hcd *xhci;
|
|
struct device *dev = hcd->self.controller;
|
|
int retval;
|
|
u32 temp;
|
|
|
|
/* Accept arbitrarily long scatter-gather lists */
|
|
hcd->self.sg_tablesize = ~0;
|
|
/* XHCI controllers don't stop the ep queue on short packets :| */
|
|
hcd->self.no_stop_on_short = 1;
|
|
|
|
if (usb_hcd_is_primary_hcd(hcd)) {
|
|
xhci = kzalloc(sizeof(struct xhci_hcd), GFP_KERNEL);
|
|
if (!xhci)
|
|
return -ENOMEM;
|
|
*((struct xhci_hcd **) hcd->hcd_priv) = xhci;
|
|
xhci->main_hcd = hcd;
|
|
/* Mark the first roothub as being USB 2.0.
|
|
* The xHCI driver will register the USB 3.0 roothub.
|
|
*/
|
|
hcd->speed = HCD_USB2;
|
|
hcd->self.root_hub->speed = USB_SPEED_HIGH;
|
|
/*
|
|
* USB 2.0 roothub under xHCI has an integrated TT,
|
|
* (rate matching hub) as opposed to having an OHCI/UHCI
|
|
* companion controller.
|
|
*/
|
|
hcd->has_tt = 1;
|
|
} else {
|
|
/* xHCI private pointer was set in xhci_pci_probe for the second
|
|
* registered roothub.
|
|
*/
|
|
xhci = hcd_to_xhci(hcd);
|
|
temp = xhci_readl(xhci, &xhci->cap_regs->hcc_params);
|
|
if (HCC_64BIT_ADDR(temp)) {
|
|
xhci_dbg(xhci, "Enabling 64-bit DMA addresses.\n");
|
|
dma_set_mask(hcd->self.controller, DMA_BIT_MASK(64));
|
|
} else {
|
|
dma_set_mask(hcd->self.controller, DMA_BIT_MASK(32));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
xhci->cap_regs = hcd->regs;
|
|
xhci->op_regs = hcd->regs +
|
|
HC_LENGTH(xhci_readl(xhci, &xhci->cap_regs->hc_capbase));
|
|
xhci->run_regs = hcd->regs +
|
|
(xhci_readl(xhci, &xhci->cap_regs->run_regs_off) & RTSOFF_MASK);
|
|
/* Cache read-only capability registers */
|
|
xhci->hcs_params1 = xhci_readl(xhci, &xhci->cap_regs->hcs_params1);
|
|
xhci->hcs_params2 = xhci_readl(xhci, &xhci->cap_regs->hcs_params2);
|
|
xhci->hcs_params3 = xhci_readl(xhci, &xhci->cap_regs->hcs_params3);
|
|
xhci->hcc_params = xhci_readl(xhci, &xhci->cap_regs->hc_capbase);
|
|
xhci->hci_version = HC_VERSION(xhci->hcc_params);
|
|
xhci->hcc_params = xhci_readl(xhci, &xhci->cap_regs->hcc_params);
|
|
xhci_print_registers(xhci);
|
|
|
|
get_quirks(dev, xhci);
|
|
|
|
/* Make sure the HC is halted. */
|
|
retval = xhci_halt(xhci);
|
|
if (retval)
|
|
goto error;
|
|
|
|
xhci_dbg(xhci, "Resetting HCD\n");
|
|
/* Reset the internal HC memory state and registers. */
|
|
retval = xhci_reset(xhci);
|
|
if (retval)
|
|
goto error;
|
|
xhci_dbg(xhci, "Reset complete\n");
|
|
|
|
temp = xhci_readl(xhci, &xhci->cap_regs->hcc_params);
|
|
if (HCC_64BIT_ADDR(temp)) {
|
|
xhci_dbg(xhci, "Enabling 64-bit DMA addresses.\n");
|
|
dma_set_mask(hcd->self.controller, DMA_BIT_MASK(64));
|
|
} else {
|
|
dma_set_mask(hcd->self.controller, DMA_BIT_MASK(32));
|
|
}
|
|
|
|
xhci_dbg(xhci, "Calling HCD init\n");
|
|
/* Initialize HCD and host controller data structures. */
|
|
retval = xhci_init(hcd);
|
|
if (retval)
|
|
goto error;
|
|
xhci_dbg(xhci, "Called HCD init\n");
|
|
return 0;
|
|
error:
|
|
kfree(xhci);
|
|
return retval;
|
|
}
|
|
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static int __init xhci_hcd_init(void)
|
|
{
|
|
int retval;
|
|
|
|
retval = xhci_register_pci();
|
|
if (retval < 0) {
|
|
printk(KERN_DEBUG "Problem registering PCI driver.");
|
|
return retval;
|
|
}
|
|
retval = xhci_register_plat();
|
|
if (retval < 0) {
|
|
printk(KERN_DEBUG "Problem registering platform driver.");
|
|
goto unreg_pci;
|
|
}
|
|
/*
|
|
* Check the compiler generated sizes of structures that must be laid
|
|
* out in specific ways for hardware access.
|
|
*/
|
|
BUILD_BUG_ON(sizeof(struct xhci_doorbell_array) != 256*32/8);
|
|
BUILD_BUG_ON(sizeof(struct xhci_slot_ctx) != 8*32/8);
|
|
BUILD_BUG_ON(sizeof(struct xhci_ep_ctx) != 8*32/8);
|
|
/* xhci_device_control has eight fields, and also
|
|
* embeds one xhci_slot_ctx and 31 xhci_ep_ctx
|
|
*/
|
|
BUILD_BUG_ON(sizeof(struct xhci_stream_ctx) != 4*32/8);
|
|
BUILD_BUG_ON(sizeof(union xhci_trb) != 4*32/8);
|
|
BUILD_BUG_ON(sizeof(struct xhci_erst_entry) != 4*32/8);
|
|
BUILD_BUG_ON(sizeof(struct xhci_cap_regs) != 7*32/8);
|
|
BUILD_BUG_ON(sizeof(struct xhci_intr_reg) != 8*32/8);
|
|
/* xhci_run_regs has eight fields and embeds 128 xhci_intr_regs */
|
|
BUILD_BUG_ON(sizeof(struct xhci_run_regs) != (8+8*128)*32/8);
|
|
return 0;
|
|
unreg_pci:
|
|
xhci_unregister_pci();
|
|
return retval;
|
|
}
|
|
module_init(xhci_hcd_init);
|
|
|
|
static void __exit xhci_hcd_cleanup(void)
|
|
{
|
|
xhci_unregister_pci();
|
|
xhci_unregister_plat();
|
|
}
|
|
module_exit(xhci_hcd_cleanup);
|