mirror of https://gitee.com/openkylin/linux.git
PCI: endpoint: functions: Add an EP function to test PCI
Adds a new endpoint function driver (to program the virtual test device) making use of the EP-core library. [bhelgaas: fold in pci_epf_test_probe() -ENOMEM test from Wei Yongjun <weiyongjun1@huawei.com>] Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Kishon Vijay Abraham I
Bjorn Helgaas
parent
42fc2ac6e8
commit
349e7a85b2
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@ -26,4 +26,6 @@ config PCI_ENDPOINT_CONFIGFS
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configure the endpoint function and used to bind the
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function with a endpoint controller.
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source "drivers/pci/endpoint/functions/Kconfig"
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endmenu
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@ -4,4 +4,4 @@
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obj-$(CONFIG_PCI_ENDPOINT_CONFIGFS) += pci-ep-cfs.o
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obj-$(CONFIG_PCI_ENDPOINT) += pci-epc-core.o pci-epf-core.o\
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pci-epc-mem.o
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pci-epc-mem.o functions/
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@ -0,0 +1,12 @@
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#
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# PCI Endpoint Functions
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#
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config PCI_EPF_TEST
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tristate "PCI Endpoint Test driver"
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depends on PCI_ENDPOINT
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help
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Enable this configuration option to enable the test driver
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for PCI Endpoint.
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If in doubt, say "N" to disable Endpoint test driver.
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@ -0,0 +1,5 @@
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#
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# Makefile for PCI Endpoint Functions
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#
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obj-$(CONFIG_PCI_EPF_TEST) += pci-epf-test.o
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@ -0,0 +1,510 @@
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/**
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* Test driver to test endpoint functionality
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*
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* Copyright (C) 2017 Texas Instruments
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* Author: Kishon Vijay Abraham I <kishon@ti.com>
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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 of
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* the License as 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,
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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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*
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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, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/crc32.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/pci_ids.h>
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#include <linux/random.h>
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#include <linux/pci-epc.h>
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#include <linux/pci-epf.h>
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#include <linux/pci_regs.h>
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#define COMMAND_RAISE_LEGACY_IRQ BIT(0)
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#define COMMAND_RAISE_MSI_IRQ BIT(1)
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#define MSI_NUMBER_SHIFT 2
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#define MSI_NUMBER_MASK (0x3f << MSI_NUMBER_SHIFT)
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#define COMMAND_READ BIT(8)
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#define COMMAND_WRITE BIT(9)
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#define COMMAND_COPY BIT(10)
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#define STATUS_READ_SUCCESS BIT(0)
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#define STATUS_READ_FAIL BIT(1)
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#define STATUS_WRITE_SUCCESS BIT(2)
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#define STATUS_WRITE_FAIL BIT(3)
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#define STATUS_COPY_SUCCESS BIT(4)
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#define STATUS_COPY_FAIL BIT(5)
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#define STATUS_IRQ_RAISED BIT(6)
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#define STATUS_SRC_ADDR_INVALID BIT(7)
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#define STATUS_DST_ADDR_INVALID BIT(8)
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#define TIMER_RESOLUTION 1
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static struct workqueue_struct *kpcitest_workqueue;
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struct pci_epf_test {
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void *reg[6];
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struct pci_epf *epf;
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struct delayed_work cmd_handler;
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};
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struct pci_epf_test_reg {
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u32 magic;
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u32 command;
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u32 status;
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u64 src_addr;
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u64 dst_addr;
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u32 size;
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u32 checksum;
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} __packed;
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static struct pci_epf_header test_header = {
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.vendorid = PCI_ANY_ID,
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.deviceid = PCI_ANY_ID,
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.baseclass_code = PCI_CLASS_OTHERS,
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.interrupt_pin = PCI_INTERRUPT_INTA,
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};
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static int bar_size[] = { 512, 1024, 16384, 131072, 1048576 };
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static int pci_epf_test_copy(struct pci_epf_test *epf_test)
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{
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int ret;
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void __iomem *src_addr;
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void __iomem *dst_addr;
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phys_addr_t src_phys_addr;
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phys_addr_t dst_phys_addr;
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struct pci_epf *epf = epf_test->epf;
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struct device *dev = &epf->dev;
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struct pci_epc *epc = epf->epc;
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struct pci_epf_test_reg *reg = epf_test->reg[0];
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src_addr = pci_epc_mem_alloc_addr(epc, &src_phys_addr, reg->size);
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if (!src_addr) {
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dev_err(dev, "failed to allocate source address\n");
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reg->status = STATUS_SRC_ADDR_INVALID;
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ret = -ENOMEM;
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goto err;
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}
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ret = pci_epc_map_addr(epc, src_phys_addr, reg->src_addr, reg->size);
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if (ret) {
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dev_err(dev, "failed to map source address\n");
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reg->status = STATUS_SRC_ADDR_INVALID;
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goto err_src_addr;
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}
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dst_addr = pci_epc_mem_alloc_addr(epc, &dst_phys_addr, reg->size);
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if (!dst_addr) {
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dev_err(dev, "failed to allocate destination address\n");
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reg->status = STATUS_DST_ADDR_INVALID;
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ret = -ENOMEM;
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goto err_src_map_addr;
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}
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ret = pci_epc_map_addr(epc, dst_phys_addr, reg->dst_addr, reg->size);
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if (ret) {
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dev_err(dev, "failed to map destination address\n");
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reg->status = STATUS_DST_ADDR_INVALID;
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goto err_dst_addr;
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}
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memcpy(dst_addr, src_addr, reg->size);
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pci_epc_unmap_addr(epc, dst_phys_addr);
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err_dst_addr:
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pci_epc_mem_free_addr(epc, dst_phys_addr, dst_addr, reg->size);
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err_src_map_addr:
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pci_epc_unmap_addr(epc, src_phys_addr);
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err_src_addr:
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pci_epc_mem_free_addr(epc, src_phys_addr, src_addr, reg->size);
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err:
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return ret;
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}
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static int pci_epf_test_read(struct pci_epf_test *epf_test)
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{
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int ret;
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void __iomem *src_addr;
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void *buf;
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u32 crc32;
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phys_addr_t phys_addr;
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struct pci_epf *epf = epf_test->epf;
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struct device *dev = &epf->dev;
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struct pci_epc *epc = epf->epc;
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struct pci_epf_test_reg *reg = epf_test->reg[0];
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src_addr = pci_epc_mem_alloc_addr(epc, &phys_addr, reg->size);
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if (!src_addr) {
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dev_err(dev, "failed to allocate address\n");
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reg->status = STATUS_SRC_ADDR_INVALID;
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ret = -ENOMEM;
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goto err;
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}
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ret = pci_epc_map_addr(epc, phys_addr, reg->src_addr, reg->size);
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if (ret) {
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dev_err(dev, "failed to map address\n");
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reg->status = STATUS_SRC_ADDR_INVALID;
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goto err_addr;
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}
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buf = kzalloc(reg->size, GFP_KERNEL);
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if (!buf) {
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ret = -ENOMEM;
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goto err_map_addr;
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}
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memcpy(buf, src_addr, reg->size);
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crc32 = crc32_le(~0, buf, reg->size);
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if (crc32 != reg->checksum)
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ret = -EIO;
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kfree(buf);
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err_map_addr:
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pci_epc_unmap_addr(epc, phys_addr);
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err_addr:
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pci_epc_mem_free_addr(epc, phys_addr, src_addr, reg->size);
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err:
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return ret;
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}
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static int pci_epf_test_write(struct pci_epf_test *epf_test)
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{
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int ret;
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void __iomem *dst_addr;
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void *buf;
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phys_addr_t phys_addr;
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struct pci_epf *epf = epf_test->epf;
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struct device *dev = &epf->dev;
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struct pci_epc *epc = epf->epc;
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struct pci_epf_test_reg *reg = epf_test->reg[0];
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dst_addr = pci_epc_mem_alloc_addr(epc, &phys_addr, reg->size);
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if (!dst_addr) {
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dev_err(dev, "failed to allocate address\n");
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reg->status = STATUS_DST_ADDR_INVALID;
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ret = -ENOMEM;
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goto err;
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}
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ret = pci_epc_map_addr(epc, phys_addr, reg->dst_addr, reg->size);
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if (ret) {
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dev_err(dev, "failed to map address\n");
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reg->status = STATUS_DST_ADDR_INVALID;
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goto err_addr;
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}
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buf = kzalloc(reg->size, GFP_KERNEL);
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if (!buf) {
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ret = -ENOMEM;
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goto err_map_addr;
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}
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get_random_bytes(buf, reg->size);
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reg->checksum = crc32_le(~0, buf, reg->size);
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memcpy(dst_addr, buf, reg->size);
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/*
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* wait 1ms inorder for the write to complete. Without this delay L3
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* error in observed in the host system.
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*/
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mdelay(1);
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kfree(buf);
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err_map_addr:
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pci_epc_unmap_addr(epc, phys_addr);
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err_addr:
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pci_epc_mem_free_addr(epc, phys_addr, dst_addr, reg->size);
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err:
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return ret;
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}
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static void pci_epf_test_raise_irq(struct pci_epf_test *epf_test)
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{
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u8 irq;
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u8 msi_count;
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struct pci_epf *epf = epf_test->epf;
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struct pci_epc *epc = epf->epc;
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struct pci_epf_test_reg *reg = epf_test->reg[0];
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reg->status |= STATUS_IRQ_RAISED;
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msi_count = pci_epc_get_msi(epc);
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irq = (reg->command & MSI_NUMBER_MASK) >> MSI_NUMBER_SHIFT;
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if (irq > msi_count || msi_count <= 0)
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pci_epc_raise_irq(epc, PCI_EPC_IRQ_LEGACY, 0);
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else
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pci_epc_raise_irq(epc, PCI_EPC_IRQ_MSI, irq);
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}
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static void pci_epf_test_cmd_handler(struct work_struct *work)
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{
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int ret;
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u8 irq;
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u8 msi_count;
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struct pci_epf_test *epf_test = container_of(work, struct pci_epf_test,
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cmd_handler.work);
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struct pci_epf *epf = epf_test->epf;
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struct pci_epc *epc = epf->epc;
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struct pci_epf_test_reg *reg = epf_test->reg[0];
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if (!reg->command)
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goto reset_handler;
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if (reg->command & COMMAND_RAISE_LEGACY_IRQ) {
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reg->status = STATUS_IRQ_RAISED;
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pci_epc_raise_irq(epc, PCI_EPC_IRQ_LEGACY, 0);
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goto reset_handler;
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}
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if (reg->command & COMMAND_WRITE) {
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ret = pci_epf_test_write(epf_test);
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if (ret)
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reg->status |= STATUS_WRITE_FAIL;
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else
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reg->status |= STATUS_WRITE_SUCCESS;
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pci_epf_test_raise_irq(epf_test);
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goto reset_handler;
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}
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if (reg->command & COMMAND_READ) {
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ret = pci_epf_test_read(epf_test);
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if (!ret)
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reg->status |= STATUS_READ_SUCCESS;
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else
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reg->status |= STATUS_READ_FAIL;
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pci_epf_test_raise_irq(epf_test);
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goto reset_handler;
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}
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if (reg->command & COMMAND_COPY) {
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ret = pci_epf_test_copy(epf_test);
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if (!ret)
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reg->status |= STATUS_COPY_SUCCESS;
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else
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reg->status |= STATUS_COPY_FAIL;
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pci_epf_test_raise_irq(epf_test);
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goto reset_handler;
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}
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if (reg->command & COMMAND_RAISE_MSI_IRQ) {
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msi_count = pci_epc_get_msi(epc);
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irq = (reg->command & MSI_NUMBER_MASK) >> MSI_NUMBER_SHIFT;
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if (irq > msi_count || msi_count <= 0)
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goto reset_handler;
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reg->status = STATUS_IRQ_RAISED;
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pci_epc_raise_irq(epc, PCI_EPC_IRQ_MSI, irq);
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goto reset_handler;
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}
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reset_handler:
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reg->command = 0;
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queue_delayed_work(kpcitest_workqueue, &epf_test->cmd_handler,
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msecs_to_jiffies(1));
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}
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static void pci_epf_test_linkup(struct pci_epf *epf)
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{
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struct pci_epf_test *epf_test = epf_get_drvdata(epf);
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queue_delayed_work(kpcitest_workqueue, &epf_test->cmd_handler,
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msecs_to_jiffies(1));
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}
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static void pci_epf_test_unbind(struct pci_epf *epf)
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{
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struct pci_epf_test *epf_test = epf_get_drvdata(epf);
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struct pci_epc *epc = epf->epc;
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int bar;
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cancel_delayed_work(&epf_test->cmd_handler);
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pci_epc_stop(epc);
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for (bar = BAR_0; bar <= BAR_5; bar++) {
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if (epf_test->reg[bar]) {
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pci_epf_free_space(epf, epf_test->reg[bar], bar);
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pci_epc_clear_bar(epc, bar);
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}
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}
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}
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static int pci_epf_test_set_bar(struct pci_epf *epf)
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{
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int flags;
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int bar;
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int ret;
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struct pci_epf_bar *epf_bar;
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struct pci_epc *epc = epf->epc;
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struct device *dev = &epf->dev;
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struct pci_epf_test *epf_test = epf_get_drvdata(epf);
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flags = PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_32;
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if (sizeof(dma_addr_t) == 0x8)
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flags |= PCI_BASE_ADDRESS_MEM_TYPE_64;
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for (bar = BAR_0; bar <= BAR_5; bar++) {
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epf_bar = &epf->bar[bar];
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ret = pci_epc_set_bar(epc, bar, epf_bar->phys_addr,
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epf_bar->size, flags);
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if (ret) {
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pci_epf_free_space(epf, epf_test->reg[bar], bar);
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dev_err(dev, "failed to set BAR%d\n", bar);
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if (bar == BAR_0)
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return ret;
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}
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}
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return 0;
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}
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static int pci_epf_test_alloc_space(struct pci_epf *epf)
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{
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struct pci_epf_test *epf_test = epf_get_drvdata(epf);
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struct device *dev = &epf->dev;
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void *base;
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int bar;
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base = pci_epf_alloc_space(epf, sizeof(struct pci_epf_test_reg),
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BAR_0);
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if (!base) {
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dev_err(dev, "failed to allocated register space\n");
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return -ENOMEM;
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}
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epf_test->reg[0] = base;
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for (bar = BAR_1; bar <= BAR_5; bar++) {
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base = pci_epf_alloc_space(epf, bar_size[bar - 1], bar);
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if (!base)
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dev_err(dev, "failed to allocate space for BAR%d\n",
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bar);
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epf_test->reg[bar] = base;
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}
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return 0;
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}
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static int pci_epf_test_bind(struct pci_epf *epf)
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{
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int ret;
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struct pci_epf_header *header = epf->header;
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struct pci_epc *epc = epf->epc;
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struct device *dev = &epf->dev;
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if (WARN_ON_ONCE(!epc))
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return -EINVAL;
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ret = pci_epc_write_header(epc, header);
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if (ret) {
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||||
dev_err(dev, "configuration header write failed\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = pci_epf_test_alloc_space(epf);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = pci_epf_test_set_bar(epf);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = pci_epc_set_msi(epc, epf->msi_interrupts);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int pci_epf_test_probe(struct pci_epf *epf)
|
||||
{
|
||||
struct pci_epf_test *epf_test;
|
||||
struct device *dev = &epf->dev;
|
||||
|
||||
epf_test = devm_kzalloc(dev, sizeof(*epf_test), GFP_KERNEL);
|
||||
if (!epf_test)
|
||||
return -ENOMEM;
|
||||
|
||||
epf->header = &test_header;
|
||||
epf_test->epf = epf;
|
||||
|
||||
INIT_DELAYED_WORK(&epf_test->cmd_handler, pci_epf_test_cmd_handler);
|
||||
|
||||
epf_set_drvdata(epf, epf_test);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int pci_epf_test_remove(struct pci_epf *epf)
|
||||
{
|
||||
struct pci_epf_test *epf_test = epf_get_drvdata(epf);
|
||||
|
||||
kfree(epf_test);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct pci_epf_ops ops = {
|
||||
.unbind = pci_epf_test_unbind,
|
||||
.bind = pci_epf_test_bind,
|
||||
.linkup = pci_epf_test_linkup,
|
||||
};
|
||||
|
||||
static const struct pci_epf_device_id pci_epf_test_ids[] = {
|
||||
{
|
||||
.name = "pci_epf_test",
|
||||
},
|
||||
{},
|
||||
};
|
||||
|
||||
static struct pci_epf_driver test_driver = {
|
||||
.driver.name = "pci_epf_test",
|
||||
.probe = pci_epf_test_probe,
|
||||
.remove = pci_epf_test_remove,
|
||||
.id_table = pci_epf_test_ids,
|
||||
.ops = &ops,
|
||||
.owner = THIS_MODULE,
|
||||
};
|
||||
|
||||
static int __init pci_epf_test_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
kpcitest_workqueue = alloc_workqueue("kpcitest",
|
||||
WQ_MEM_RECLAIM | WQ_HIGHPRI, 0);
|
||||
ret = pci_epf_register_driver(&test_driver);
|
||||
if (ret) {
|
||||
pr_err("failed to register pci epf test driver --> %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
module_init(pci_epf_test_init);
|
||||
|
||||
static void __exit pci_epf_test_exit(void)
|
||||
{
|
||||
pci_epf_unregister_driver(&test_driver);
|
||||
}
|
||||
module_exit(pci_epf_test_exit);
|
||||
|
||||
MODULE_DESCRIPTION("PCI EPF TEST DRIVER");
|
||||
MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue