2010-10-19 17:06:32 +08:00
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/*
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* msi.c
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*
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* Copyright (c) 2010 Isaku Yamahata <yamahata at valinux co jp>
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* VA Linux Systems Japan K.K.
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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2016-01-27 02:17:15 +08:00
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#include "qemu/osdep.h"
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2012-12-13 05:05:42 +08:00
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#include "hw/pci/msi.h"
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2016-01-13 22:59:09 +08:00
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#include "hw/xen/xen.h"
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2012-12-18 01:20:00 +08:00
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#include "qemu/range.h"
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2016-06-20 14:13:39 +08:00
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#include "qapi/error.h"
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2010-10-19 17:06:32 +08:00
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/* PCI_MSI_ADDRESS_LO */
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#define PCI_MSI_ADDRESS_LO_MASK (~0x3)
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/* If we get rid of cap allocator, we won't need those. */
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#define PCI_MSI_32_SIZEOF 0x0a
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#define PCI_MSI_64_SIZEOF 0x0e
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#define PCI_MSI_32M_SIZEOF 0x14
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#define PCI_MSI_64M_SIZEOF 0x18
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#define PCI_MSI_VECTORS_MAX 32
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2016-03-04 17:24:28 +08:00
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/*
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* Flag for interrupt controllers to declare broken MSI/MSI-X support.
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* values: false - broken; true - non-broken.
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*
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* Setting this flag to false will remove MSI/MSI-X capability from all devices.
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*
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2016-03-23 22:59:57 +08:00
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* It is preferable for controllers to set this to true (non-broken) even if
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2016-03-04 17:24:28 +08:00
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* they do not actually support MSI/MSI-X: guests normally probe the controller
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* type and do not attempt to enable MSI/MSI-X with interrupt controllers not
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* supporting such, so removing the capability is not required, and
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* it seems cleaner to have a given device look the same for all boards.
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*
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* TODO: some existing controllers violate the above rule. Identify and fix them.
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*/
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bool msi_nonbroken;
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2011-10-15 20:33:17 +08:00
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2010-10-19 17:06:32 +08:00
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/* If we get rid of cap allocator, we won't need this. */
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static inline uint8_t msi_cap_sizeof(uint16_t flags)
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{
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switch (flags & (PCI_MSI_FLAGS_MASKBIT | PCI_MSI_FLAGS_64BIT)) {
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case PCI_MSI_FLAGS_MASKBIT | PCI_MSI_FLAGS_64BIT:
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return PCI_MSI_64M_SIZEOF;
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case PCI_MSI_FLAGS_64BIT:
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return PCI_MSI_64_SIZEOF;
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case PCI_MSI_FLAGS_MASKBIT:
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return PCI_MSI_32M_SIZEOF;
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case 0:
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return PCI_MSI_32_SIZEOF;
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default:
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abort();
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break;
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}
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return 0;
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}
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//#define MSI_DEBUG
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#ifdef MSI_DEBUG
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# define MSI_DPRINTF(fmt, ...) \
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fprintf(stderr, "%s:%d " fmt, __func__, __LINE__, ## __VA_ARGS__)
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#else
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# define MSI_DPRINTF(fmt, ...) do { } while (0)
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#endif
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#define MSI_DEV_PRINTF(dev, fmt, ...) \
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MSI_DPRINTF("%s:%x " fmt, (dev)->name, (dev)->devfn, ## __VA_ARGS__)
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static inline unsigned int msi_nr_vectors(uint16_t flags)
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{
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return 1U <<
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2015-03-23 23:29:26 +08:00
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((flags & PCI_MSI_FLAGS_QSIZE) >> ctz32(PCI_MSI_FLAGS_QSIZE));
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2010-10-19 17:06:32 +08:00
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}
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static inline uint8_t msi_flags_off(const PCIDevice* dev)
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{
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return dev->msi_cap + PCI_MSI_FLAGS;
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}
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static inline uint8_t msi_address_lo_off(const PCIDevice* dev)
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{
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return dev->msi_cap + PCI_MSI_ADDRESS_LO;
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}
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static inline uint8_t msi_address_hi_off(const PCIDevice* dev)
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{
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return dev->msi_cap + PCI_MSI_ADDRESS_HI;
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}
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static inline uint8_t msi_data_off(const PCIDevice* dev, bool msi64bit)
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{
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return dev->msi_cap + (msi64bit ? PCI_MSI_DATA_64 : PCI_MSI_DATA_32);
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}
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static inline uint8_t msi_mask_off(const PCIDevice* dev, bool msi64bit)
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{
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return dev->msi_cap + (msi64bit ? PCI_MSI_MASK_64 : PCI_MSI_MASK_32);
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}
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static inline uint8_t msi_pending_off(const PCIDevice* dev, bool msi64bit)
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{
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return dev->msi_cap + (msi64bit ? PCI_MSI_PENDING_64 : PCI_MSI_PENDING_32);
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}
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2012-07-19 08:35:07 +08:00
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/*
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* Special API for POWER to configure the vectors through
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* a side channel. Should never be used by devices.
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*/
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void msi_set_message(PCIDevice *dev, MSIMessage msg)
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{
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uint16_t flags = pci_get_word(dev->config + msi_flags_off(dev));
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bool msi64bit = flags & PCI_MSI_FLAGS_64BIT;
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if (msi64bit) {
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pci_set_quad(dev->config + msi_address_lo_off(dev), msg.address);
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} else {
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pci_set_long(dev->config + msi_address_lo_off(dev), msg.address);
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}
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pci_set_word(dev->config + msi_data_off(dev, msi64bit), msg.data);
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}
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2012-10-03 03:22:07 +08:00
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MSIMessage msi_get_message(PCIDevice *dev, unsigned int vector)
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{
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uint16_t flags = pci_get_word(dev->config + msi_flags_off(dev));
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bool msi64bit = flags & PCI_MSI_FLAGS_64BIT;
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unsigned int nr_vectors = msi_nr_vectors(flags);
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MSIMessage msg;
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assert(vector < nr_vectors);
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if (msi64bit) {
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msg.address = pci_get_quad(dev->config + msi_address_lo_off(dev));
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} else {
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msg.address = pci_get_long(dev->config + msi_address_lo_off(dev));
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}
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/* upper bit 31:16 is zero */
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msg.data = pci_get_word(dev->config + msi_data_off(dev, msi64bit));
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if (nr_vectors > 1) {
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msg.data &= ~(nr_vectors - 1);
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msg.data |= vector;
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}
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return msg;
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}
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2010-10-19 17:06:32 +08:00
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bool msi_enabled(const PCIDevice *dev)
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{
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return msi_present(dev) &&
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(pci_get_word(dev->config + msi_flags_off(dev)) &
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PCI_MSI_FLAGS_ENABLE);
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}
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2016-06-10 17:54:23 +08:00
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/*
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* Make PCI device @dev MSI-capable.
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* Non-zero @offset puts capability MSI at that offset in PCI config
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* space.
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* @nr_vectors is the number of MSI vectors (1, 2, 4, 8, 16 or 32).
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* If @msi64bit, make the device capable of sending a 64-bit message
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* address.
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* If @msi_per_vector_mask, make the device support per-vector masking.
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2016-06-20 14:13:39 +08:00
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* @errp is for returning errors.
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* Return 0 on success; set @errp and return -errno on error.
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2016-06-10 17:54:23 +08:00
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*
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* -ENOTSUP means lacking msi support for a msi-capable platform.
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* -EINVAL means capability overlap, happens when @offset is non-zero,
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* also means a programming error, except device assignment, which can check
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* if a real HW is broken.
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*/
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2010-10-19 17:06:32 +08:00
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int msi_init(struct PCIDevice *dev, uint8_t offset,
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2016-06-20 14:13:39 +08:00
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unsigned int nr_vectors, bool msi64bit,
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bool msi_per_vector_mask, Error **errp)
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2010-10-19 17:06:32 +08:00
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{
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unsigned int vectors_order;
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uint16_t flags;
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uint8_t cap_size;
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int config_offset;
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2011-10-15 20:33:17 +08:00
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2016-03-04 17:24:28 +08:00
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if (!msi_nonbroken) {
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2016-06-20 14:13:39 +08:00
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error_setg(errp, "MSI is not supported by interrupt controller");
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2011-10-15 20:33:17 +08:00
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return -ENOTSUP;
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}
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2010-10-19 17:06:32 +08:00
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MSI_DEV_PRINTF(dev,
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"init offset: 0x%"PRIx8" vector: %"PRId8
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" 64bit %d mask %d\n",
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offset, nr_vectors, msi64bit, msi_per_vector_mask);
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assert(!(nr_vectors & (nr_vectors - 1))); /* power of 2 */
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assert(nr_vectors > 0);
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assert(nr_vectors <= PCI_MSI_VECTORS_MAX);
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/* the nr of MSI vectors is up to 32 */
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2015-03-23 23:29:26 +08:00
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vectors_order = ctz32(nr_vectors);
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2010-10-19 17:06:32 +08:00
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2015-03-23 23:29:26 +08:00
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flags = vectors_order << ctz32(PCI_MSI_FLAGS_QMASK);
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2010-10-19 17:06:32 +08:00
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if (msi64bit) {
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flags |= PCI_MSI_FLAGS_64BIT;
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}
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if (msi_per_vector_mask) {
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flags |= PCI_MSI_FLAGS_MASKBIT;
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}
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cap_size = msi_cap_sizeof(flags);
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2017-06-27 14:16:51 +08:00
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config_offset = pci_add_capability(dev, PCI_CAP_ID_MSI, offset,
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2016-06-20 14:13:39 +08:00
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cap_size, errp);
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2010-10-19 17:06:32 +08:00
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if (config_offset < 0) {
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return config_offset;
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}
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dev->msi_cap = config_offset;
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dev->cap_present |= QEMU_PCI_CAP_MSI;
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pci_set_word(dev->config + msi_flags_off(dev), flags);
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pci_set_word(dev->wmask + msi_flags_off(dev),
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PCI_MSI_FLAGS_QSIZE | PCI_MSI_FLAGS_ENABLE);
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pci_set_long(dev->wmask + msi_address_lo_off(dev),
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PCI_MSI_ADDRESS_LO_MASK);
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if (msi64bit) {
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pci_set_long(dev->wmask + msi_address_hi_off(dev), 0xffffffff);
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}
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pci_set_word(dev->wmask + msi_data_off(dev, msi64bit), 0xffff);
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if (msi_per_vector_mask) {
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2011-04-26 16:29:36 +08:00
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/* Make mask bits 0 to nr_vectors - 1 writable. */
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2010-10-19 17:06:32 +08:00
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pci_set_long(dev->wmask + msi_mask_off(dev, msi64bit),
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0xffffffff >> (PCI_MSI_VECTORS_MAX - nr_vectors));
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}
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2016-06-10 17:54:32 +08:00
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return 0;
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2010-10-19 17:06:32 +08:00
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}
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void msi_uninit(struct PCIDevice *dev)
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{
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2011-05-03 02:00:47 +08:00
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uint16_t flags;
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uint8_t cap_size;
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2012-06-04 22:53:48 +08:00
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if (!msi_present(dev)) {
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2011-05-03 02:00:47 +08:00
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return;
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}
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flags = pci_get_word(dev->config + msi_flags_off(dev));
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cap_size = msi_cap_sizeof(flags);
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2011-06-08 01:26:20 +08:00
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pci_del_capability(dev, PCI_CAP_ID_MSI, cap_size);
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2011-05-03 02:00:47 +08:00
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dev->cap_present &= ~QEMU_PCI_CAP_MSI;
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2010-10-19 17:06:32 +08:00
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MSI_DEV_PRINTF(dev, "uninit\n");
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}
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void msi_reset(PCIDevice *dev)
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{
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uint16_t flags;
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bool msi64bit;
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2012-05-11 22:42:37 +08:00
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if (!msi_present(dev)) {
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return;
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}
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2010-10-19 17:06:32 +08:00
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flags = pci_get_word(dev->config + msi_flags_off(dev));
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flags &= ~(PCI_MSI_FLAGS_QSIZE | PCI_MSI_FLAGS_ENABLE);
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msi64bit = flags & PCI_MSI_FLAGS_64BIT;
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pci_set_word(dev->config + msi_flags_off(dev), flags);
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pci_set_long(dev->config + msi_address_lo_off(dev), 0);
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if (msi64bit) {
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pci_set_long(dev->config + msi_address_hi_off(dev), 0);
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}
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pci_set_word(dev->config + msi_data_off(dev, msi64bit), 0);
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if (flags & PCI_MSI_FLAGS_MASKBIT) {
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pci_set_long(dev->config + msi_mask_off(dev, msi64bit), 0);
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pci_set_long(dev->config + msi_pending_off(dev, msi64bit), 0);
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}
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MSI_DEV_PRINTF(dev, "reset\n");
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}
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static bool msi_is_masked(const PCIDevice *dev, unsigned int vector)
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{
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uint16_t flags = pci_get_word(dev->config + msi_flags_off(dev));
|
2016-01-13 22:59:09 +08:00
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uint32_t mask, data;
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bool msi64bit = flags & PCI_MSI_FLAGS_64BIT;
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2010-10-19 17:06:32 +08:00
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assert(vector < PCI_MSI_VECTORS_MAX);
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if (!(flags & PCI_MSI_FLAGS_MASKBIT)) {
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return false;
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}
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2016-01-13 22:59:09 +08:00
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data = pci_get_word(dev->config + msi_data_off(dev, msi64bit));
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if (xen_is_pirq_msi(data)) {
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return false;
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}
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2010-10-19 17:06:32 +08:00
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mask = pci_get_long(dev->config +
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msi_mask_off(dev, flags & PCI_MSI_FLAGS_64BIT));
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return mask & (1U << vector);
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}
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void msi_notify(PCIDevice *dev, unsigned int vector)
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{
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uint16_t flags = pci_get_word(dev->config + msi_flags_off(dev));
|
|
|
|
bool msi64bit = flags & PCI_MSI_FLAGS_64BIT;
|
|
|
|
unsigned int nr_vectors = msi_nr_vectors(flags);
|
2012-10-03 03:22:07 +08:00
|
|
|
MSIMessage msg;
|
2010-10-19 17:06:32 +08:00
|
|
|
|
|
|
|
assert(vector < nr_vectors);
|
|
|
|
if (msi_is_masked(dev, vector)) {
|
|
|
|
assert(flags & PCI_MSI_FLAGS_MASKBIT);
|
|
|
|
pci_long_test_and_set_mask(
|
|
|
|
dev->config + msi_pending_off(dev, msi64bit), 1U << vector);
|
|
|
|
MSI_DEV_PRINTF(dev, "pending vector 0x%x\n", vector);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2012-10-03 03:22:07 +08:00
|
|
|
msg = msi_get_message(dev, vector);
|
2010-10-19 17:06:32 +08:00
|
|
|
|
|
|
|
MSI_DEV_PRINTF(dev,
|
|
|
|
"notify vector 0x%x"
|
|
|
|
" address: 0x%"PRIx64" data: 0x%"PRIx32"\n",
|
2012-10-03 03:22:07 +08:00
|
|
|
vector, msg.address, msg.data);
|
2015-05-27 20:59:59 +08:00
|
|
|
msi_send_message(dev, msg);
|
|
|
|
}
|
|
|
|
|
|
|
|
void msi_send_message(PCIDevice *dev, MSIMessage msg)
|
|
|
|
{
|
|
|
|
MemTxAttrs attrs = {};
|
|
|
|
|
2015-10-15 21:44:51 +08:00
|
|
|
attrs.requester_id = pci_requester_id(dev);
|
Switch non-CPU callers from ld/st*_phys to address_space_ld/st*
Switch all the uses of ld/st*_phys to address_space_ld/st*,
except for those cases where the address space is the CPU's
(ie cs->as). This was done with the following script which
generates a Coccinelle patch.
A few over-80-columns lines in the result were rewrapped by
hand where Coccinelle failed to do the wrapping automatically,
as well as one location where it didn't put a line-continuation
'\' when wrapping lines on a change made to a match inside
a macro definition.
===begin===
#!/bin/sh -e
# Usage:
# ./ldst-phys.spatch.sh > ldst-phys.spatch
# spatch -sp_file ldst-phys.spatch -dir . | sed -e '/^+/s/\t/ /g' > out.patch
# patch -p1 < out.patch
for FN in ub uw_le uw_be l_le l_be q_le q_be uw l q; do
cat <<EOF
@ cpu_matches_ld_${FN} @
expression E1,E2;
identifier as;
@@
ld${FN}_phys(E1->as,E2)
@ other_matches_ld_${FN} depends on !cpu_matches_ld_${FN} @
expression E1,E2;
@@
-ld${FN}_phys(E1,E2)
+address_space_ld${FN}(E1,E2, MEMTXATTRS_UNSPECIFIED, NULL)
EOF
done
for FN in b w_le w_be l_le l_be q_le q_be w l q; do
cat <<EOF
@ cpu_matches_st_${FN} @
expression E1,E2,E3;
identifier as;
@@
st${FN}_phys(E1->as,E2,E3)
@ other_matches_st_${FN} depends on !cpu_matches_st_${FN} @
expression E1,E2,E3;
@@
-st${FN}_phys(E1,E2,E3)
+address_space_st${FN}(E1,E2,E3, MEMTXATTRS_UNSPECIFIED, NULL)
EOF
done
===endit===
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
2015-04-26 23:49:24 +08:00
|
|
|
address_space_stl_le(&dev->bus_master_as, msg.address, msg.data,
|
2015-05-27 20:59:59 +08:00
|
|
|
attrs, NULL);
|
2010-10-19 17:06:32 +08:00
|
|
|
}
|
|
|
|
|
2012-05-11 22:42:40 +08:00
|
|
|
/* Normally called by pci_default_write_config(). */
|
2010-10-19 17:06:32 +08:00
|
|
|
void msi_write_config(PCIDevice *dev, uint32_t addr, uint32_t val, int len)
|
|
|
|
{
|
|
|
|
uint16_t flags = pci_get_word(dev->config + msi_flags_off(dev));
|
|
|
|
bool msi64bit = flags & PCI_MSI_FLAGS_64BIT;
|
|
|
|
bool msi_per_vector_mask = flags & PCI_MSI_FLAGS_MASKBIT;
|
|
|
|
unsigned int nr_vectors;
|
|
|
|
uint8_t log_num_vecs;
|
|
|
|
uint8_t log_max_vecs;
|
|
|
|
unsigned int vector;
|
|
|
|
uint32_t pending;
|
|
|
|
|
2012-05-11 22:42:39 +08:00
|
|
|
if (!msi_present(dev) ||
|
|
|
|
!ranges_overlap(addr, len, dev->msi_cap, msi_cap_sizeof(flags))) {
|
2010-10-27 22:14:56 +08:00
|
|
|
return;
|
2010-10-19 17:06:32 +08:00
|
|
|
}
|
|
|
|
|
2010-10-27 22:14:56 +08:00
|
|
|
#ifdef MSI_DEBUG
|
|
|
|
MSI_DEV_PRINTF(dev, "addr 0x%"PRIx32" val 0x%"PRIx32" len %d\n",
|
|
|
|
addr, val, len);
|
|
|
|
MSI_DEV_PRINTF(dev, "ctrl: 0x%"PRIx16" address: 0x%"PRIx32,
|
|
|
|
flags,
|
|
|
|
pci_get_long(dev->config + msi_address_lo_off(dev)));
|
|
|
|
if (msi64bit) {
|
2010-10-27 22:28:22 +08:00
|
|
|
fprintf(stderr, " address-hi: 0x%"PRIx32,
|
2010-10-27 22:14:56 +08:00
|
|
|
pci_get_long(dev->config + msi_address_hi_off(dev)));
|
|
|
|
}
|
|
|
|
fprintf(stderr, " data: 0x%"PRIx16,
|
|
|
|
pci_get_word(dev->config + msi_data_off(dev, msi64bit)));
|
|
|
|
if (flags & PCI_MSI_FLAGS_MASKBIT) {
|
|
|
|
fprintf(stderr, " mask 0x%"PRIx32" pending 0x%"PRIx32,
|
|
|
|
pci_get_long(dev->config + msi_mask_off(dev, msi64bit)),
|
|
|
|
pci_get_long(dev->config + msi_pending_off(dev, msi64bit)));
|
2010-10-19 17:06:32 +08:00
|
|
|
}
|
2010-10-27 22:14:56 +08:00
|
|
|
fprintf(stderr, "\n");
|
|
|
|
#endif
|
2010-10-19 17:06:32 +08:00
|
|
|
|
|
|
|
if (!(flags & PCI_MSI_FLAGS_ENABLE)) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Now MSI is enabled, clear INTx# interrupts.
|
|
|
|
* the driver is prohibited from writing enable bit to mask
|
|
|
|
* a service request. But the guest OS could do this.
|
|
|
|
* So we just discard the interrupts as moderate fallback.
|
|
|
|
*
|
|
|
|
* 6.8.3.3. Enabling Operation
|
|
|
|
* While enabled for MSI or MSI-X operation, a function is prohibited
|
|
|
|
* from using its INTx# pin (if implemented) to request
|
|
|
|
* service (MSI, MSI-X, and INTx# are mutually exclusive).
|
|
|
|
*/
|
2011-01-20 15:21:39 +08:00
|
|
|
pci_device_deassert_intx(dev);
|
2010-10-19 17:06:32 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* nr_vectors might be set bigger than capable. So clamp it.
|
|
|
|
* This is not legal by spec, so we can do anything we like,
|
|
|
|
* just don't crash the host
|
|
|
|
*/
|
|
|
|
log_num_vecs =
|
2015-03-23 23:29:26 +08:00
|
|
|
(flags & PCI_MSI_FLAGS_QSIZE) >> ctz32(PCI_MSI_FLAGS_QSIZE);
|
2010-10-19 17:06:32 +08:00
|
|
|
log_max_vecs =
|
2015-03-23 23:29:26 +08:00
|
|
|
(flags & PCI_MSI_FLAGS_QMASK) >> ctz32(PCI_MSI_FLAGS_QMASK);
|
2010-10-19 17:06:32 +08:00
|
|
|
if (log_num_vecs > log_max_vecs) {
|
|
|
|
flags &= ~PCI_MSI_FLAGS_QSIZE;
|
2015-03-23 23:29:26 +08:00
|
|
|
flags |= log_max_vecs << ctz32(PCI_MSI_FLAGS_QSIZE);
|
2010-10-19 17:06:32 +08:00
|
|
|
pci_set_word(dev->config + msi_flags_off(dev), flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!msi_per_vector_mask) {
|
|
|
|
/* if per vector masking isn't supported,
|
|
|
|
there is no pending interrupt. */
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
nr_vectors = msi_nr_vectors(flags);
|
|
|
|
|
|
|
|
/* This will discard pending interrupts, if any. */
|
|
|
|
pending = pci_get_long(dev->config + msi_pending_off(dev, msi64bit));
|
|
|
|
pending &= 0xffffffff >> (PCI_MSI_VECTORS_MAX - nr_vectors);
|
|
|
|
pci_set_long(dev->config + msi_pending_off(dev, msi64bit), pending);
|
|
|
|
|
|
|
|
/* deliver pending interrupts which are unmasked */
|
|
|
|
for (vector = 0; vector < nr_vectors; ++vector) {
|
|
|
|
if (msi_is_masked(dev, vector) || !(pending & (1U << vector))) {
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
|
|
|
pci_long_test_and_clear_mask(
|
|
|
|
dev->config + msi_pending_off(dev, msi64bit), 1U << vector);
|
|
|
|
msi_notify(dev, vector);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
unsigned int msi_nr_vectors_allocated(const PCIDevice *dev)
|
|
|
|
{
|
|
|
|
uint16_t flags = pci_get_word(dev->config + msi_flags_off(dev));
|
|
|
|
return msi_nr_vectors(flags);
|
|
|
|
}
|