Commit 349e7a85 authored by Kishon Vijay Abraham I's avatar Kishon Vijay Abraham I Committed by Bjorn Helgaas

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: default avatarKishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent 42fc2ac6
...@@ -26,4 +26,6 @@ config PCI_ENDPOINT_CONFIGFS ...@@ -26,4 +26,6 @@ config PCI_ENDPOINT_CONFIGFS
configure the endpoint function and used to bind the configure the endpoint function and used to bind the
function with a endpoint controller. function with a endpoint controller.
source "drivers/pci/endpoint/functions/Kconfig"
endmenu endmenu
...@@ -4,4 +4,4 @@ ...@@ -4,4 +4,4 @@
obj-$(CONFIG_PCI_ENDPOINT_CONFIGFS) += pci-ep-cfs.o obj-$(CONFIG_PCI_ENDPOINT_CONFIGFS) += pci-ep-cfs.o
obj-$(CONFIG_PCI_ENDPOINT) += pci-epc-core.o pci-epf-core.o\ obj-$(CONFIG_PCI_ENDPOINT) += pci-epc-core.o pci-epf-core.o\
pci-epc-mem.o pci-epc-mem.o functions/
#
# PCI Endpoint Functions
#
config PCI_EPF_TEST
tristate "PCI Endpoint Test driver"
depends on PCI_ENDPOINT
help
Enable this configuration option to enable the test driver
for PCI Endpoint.
If in doubt, say "N" to disable Endpoint test driver.
#
# Makefile for PCI Endpoint Functions
#
obj-$(CONFIG_PCI_EPF_TEST) += pci-epf-test.o
/**
* Test driver to test endpoint functionality
*
* Copyright (C) 2017 Texas Instruments
* Author: Kishon Vijay Abraham I <kishon@ti.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 of
* the License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/crc32.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/pci_ids.h>
#include <linux/random.h>
#include <linux/pci-epc.h>
#include <linux/pci-epf.h>
#include <linux/pci_regs.h>
#define COMMAND_RAISE_LEGACY_IRQ BIT(0)
#define COMMAND_RAISE_MSI_IRQ BIT(1)
#define MSI_NUMBER_SHIFT 2
#define MSI_NUMBER_MASK (0x3f << MSI_NUMBER_SHIFT)
#define COMMAND_READ BIT(8)
#define COMMAND_WRITE BIT(9)
#define COMMAND_COPY BIT(10)
#define STATUS_READ_SUCCESS BIT(0)
#define STATUS_READ_FAIL BIT(1)
#define STATUS_WRITE_SUCCESS BIT(2)
#define STATUS_WRITE_FAIL BIT(3)
#define STATUS_COPY_SUCCESS BIT(4)
#define STATUS_COPY_FAIL BIT(5)
#define STATUS_IRQ_RAISED BIT(6)
#define STATUS_SRC_ADDR_INVALID BIT(7)
#define STATUS_DST_ADDR_INVALID BIT(8)
#define TIMER_RESOLUTION 1
static struct workqueue_struct *kpcitest_workqueue;
struct pci_epf_test {
void *reg[6];
struct pci_epf *epf;
struct delayed_work cmd_handler;
};
struct pci_epf_test_reg {
u32 magic;
u32 command;
u32 status;
u64 src_addr;
u64 dst_addr;
u32 size;
u32 checksum;
} __packed;
static struct pci_epf_header test_header = {
.vendorid = PCI_ANY_ID,
.deviceid = PCI_ANY_ID,
.baseclass_code = PCI_CLASS_OTHERS,
.interrupt_pin = PCI_INTERRUPT_INTA,
};
static int bar_size[] = { 512, 1024, 16384, 131072, 1048576 };
static int pci_epf_test_copy(struct pci_epf_test *epf_test)
{
int ret;
void __iomem *src_addr;
void __iomem *dst_addr;
phys_addr_t src_phys_addr;
phys_addr_t dst_phys_addr;
struct pci_epf *epf = epf_test->epf;
struct device *dev = &epf->dev;
struct pci_epc *epc = epf->epc;
struct pci_epf_test_reg *reg = epf_test->reg[0];
src_addr = pci_epc_mem_alloc_addr(epc, &src_phys_addr, reg->size);
if (!src_addr) {
dev_err(dev, "failed to allocate source address\n");
reg->status = STATUS_SRC_ADDR_INVALID;
ret = -ENOMEM;
goto err;
}
ret = pci_epc_map_addr(epc, src_phys_addr, reg->src_addr, reg->size);
if (ret) {
dev_err(dev, "failed to map source address\n");
reg->status = STATUS_SRC_ADDR_INVALID;
goto err_src_addr;
}
dst_addr = pci_epc_mem_alloc_addr(epc, &dst_phys_addr, reg->size);
if (!dst_addr) {
dev_err(dev, "failed to allocate destination address\n");
reg->status = STATUS_DST_ADDR_INVALID;
ret = -ENOMEM;
goto err_src_map_addr;
}
ret = pci_epc_map_addr(epc, dst_phys_addr, reg->dst_addr, reg->size);
if (ret) {
dev_err(dev, "failed to map destination address\n");
reg->status = STATUS_DST_ADDR_INVALID;
goto err_dst_addr;
}
memcpy(dst_addr, src_addr, reg->size);
pci_epc_unmap_addr(epc, dst_phys_addr);
err_dst_addr:
pci_epc_mem_free_addr(epc, dst_phys_addr, dst_addr, reg->size);
err_src_map_addr:
pci_epc_unmap_addr(epc, src_phys_addr);
err_src_addr:
pci_epc_mem_free_addr(epc, src_phys_addr, src_addr, reg->size);
err:
return ret;
}
static int pci_epf_test_read(struct pci_epf_test *epf_test)
{
int ret;
void __iomem *src_addr;
void *buf;
u32 crc32;
phys_addr_t phys_addr;
struct pci_epf *epf = epf_test->epf;
struct device *dev = &epf->dev;
struct pci_epc *epc = epf->epc;
struct pci_epf_test_reg *reg = epf_test->reg[0];
src_addr = pci_epc_mem_alloc_addr(epc, &phys_addr, reg->size);
if (!src_addr) {
dev_err(dev, "failed to allocate address\n");
reg->status = STATUS_SRC_ADDR_INVALID;
ret = -ENOMEM;
goto err;
}
ret = pci_epc_map_addr(epc, phys_addr, reg->src_addr, reg->size);
if (ret) {
dev_err(dev, "failed to map address\n");
reg->status = STATUS_SRC_ADDR_INVALID;
goto err_addr;
}
buf = kzalloc(reg->size, GFP_KERNEL);
if (!buf) {
ret = -ENOMEM;
goto err_map_addr;
}
memcpy(buf, src_addr, reg->size);
crc32 = crc32_le(~0, buf, reg->size);
if (crc32 != reg->checksum)
ret = -EIO;
kfree(buf);
err_map_addr:
pci_epc_unmap_addr(epc, phys_addr);
err_addr:
pci_epc_mem_free_addr(epc, phys_addr, src_addr, reg->size);
err:
return ret;
}
static int pci_epf_test_write(struct pci_epf_test *epf_test)
{
int ret;
void __iomem *dst_addr;
void *buf;
phys_addr_t phys_addr;
struct pci_epf *epf = epf_test->epf;
struct device *dev = &epf->dev;
struct pci_epc *epc = epf->epc;
struct pci_epf_test_reg *reg = epf_test->reg[0];
dst_addr = pci_epc_mem_alloc_addr(epc, &phys_addr, reg->size);
if (!dst_addr) {
dev_err(dev, "failed to allocate address\n");
reg->status = STATUS_DST_ADDR_INVALID;
ret = -ENOMEM;
goto err;
}
ret = pci_epc_map_addr(epc, phys_addr, reg->dst_addr, reg->size);
if (ret) {
dev_err(dev, "failed to map address\n");
reg->status = STATUS_DST_ADDR_INVALID;
goto err_addr;
}
buf = kzalloc(reg->size, GFP_KERNEL);
if (!buf) {
ret = -ENOMEM;
goto err_map_addr;
}
get_random_bytes(buf, reg->size);
reg->checksum = crc32_le(~0, buf, reg->size);
memcpy(dst_addr, buf, reg->size);
/*
* wait 1ms inorder for the write to complete. Without this delay L3
* error in observed in the host system.
*/
mdelay(1);
kfree(buf);
err_map_addr:
pci_epc_unmap_addr(epc, phys_addr);
err_addr:
pci_epc_mem_free_addr(epc, phys_addr, dst_addr, reg->size);
err:
return ret;
}
static void pci_epf_test_raise_irq(struct pci_epf_test *epf_test)
{
u8 irq;
u8 msi_count;
struct pci_epf *epf = epf_test->epf;
struct pci_epc *epc = epf->epc;
struct pci_epf_test_reg *reg = epf_test->reg[0];
reg->status |= STATUS_IRQ_RAISED;
msi_count = pci_epc_get_msi(epc);
irq = (reg->command & MSI_NUMBER_MASK) >> MSI_NUMBER_SHIFT;
if (irq > msi_count || msi_count <= 0)
pci_epc_raise_irq(epc, PCI_EPC_IRQ_LEGACY, 0);
else
pci_epc_raise_irq(epc, PCI_EPC_IRQ_MSI, irq);
}
static void pci_epf_test_cmd_handler(struct work_struct *work)
{
int ret;
u8 irq;
u8 msi_count;
struct pci_epf_test *epf_test = container_of(work, struct pci_epf_test,
cmd_handler.work);
struct pci_epf *epf = epf_test->epf;
struct pci_epc *epc = epf->epc;
struct pci_epf_test_reg *reg = epf_test->reg[0];
if (!reg->command)
goto reset_handler;
if (reg->command & COMMAND_RAISE_LEGACY_IRQ) {
reg->status = STATUS_IRQ_RAISED;
pci_epc_raise_irq(epc, PCI_EPC_IRQ_LEGACY, 0);
goto reset_handler;
}
if (reg->command & COMMAND_WRITE) {
ret = pci_epf_test_write(epf_test);
if (ret)
reg->status |= STATUS_WRITE_FAIL;
else
reg->status |= STATUS_WRITE_SUCCESS;
pci_epf_test_raise_irq(epf_test);
goto reset_handler;
}
if (reg->command & COMMAND_READ) {
ret = pci_epf_test_read(epf_test);
if (!ret)
reg->status |= STATUS_READ_SUCCESS;
else
reg->status |= STATUS_READ_FAIL;
pci_epf_test_raise_irq(epf_test);
goto reset_handler;
}
if (reg->command & COMMAND_COPY) {
ret = pci_epf_test_copy(epf_test);
if (!ret)
reg->status |= STATUS_COPY_SUCCESS;
else
reg->status |= STATUS_COPY_FAIL;
pci_epf_test_raise_irq(epf_test);
goto reset_handler;
}
if (reg->command & COMMAND_RAISE_MSI_IRQ) {
msi_count = pci_epc_get_msi(epc);
irq = (reg->command & MSI_NUMBER_MASK) >> MSI_NUMBER_SHIFT;
if (irq > msi_count || msi_count <= 0)
goto reset_handler;
reg->status = STATUS_IRQ_RAISED;
pci_epc_raise_irq(epc, PCI_EPC_IRQ_MSI, irq);
goto reset_handler;
}
reset_handler:
reg->command = 0;
queue_delayed_work(kpcitest_workqueue, &epf_test->cmd_handler,
msecs_to_jiffies(1));
}
static void pci_epf_test_linkup(struct pci_epf *epf)
{
struct pci_epf_test *epf_test = epf_get_drvdata(epf);
queue_delayed_work(kpcitest_workqueue, &epf_test->cmd_handler,
msecs_to_jiffies(1));
}
static void pci_epf_test_unbind(struct pci_epf *epf)
{
struct pci_epf_test *epf_test = epf_get_drvdata(epf);
struct pci_epc *epc = epf->epc;
int bar;
cancel_delayed_work(&epf_test->cmd_handler);
pci_epc_stop(epc);
for (bar = BAR_0; bar <= BAR_5; bar++) {
if (epf_test->reg[bar]) {
pci_epf_free_space(epf, epf_test->reg[bar], bar);
pci_epc_clear_bar(epc, bar);
}
}
}
static int pci_epf_test_set_bar(struct pci_epf *epf)
{
int flags;
int bar;
int ret;
struct pci_epf_bar *epf_bar;
struct pci_epc *epc = epf->epc;
struct device *dev = &epf->dev;
struct pci_epf_test *epf_test = epf_get_drvdata(epf);
flags = PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_32;
if (sizeof(dma_addr_t) == 0x8)
flags |= PCI_BASE_ADDRESS_MEM_TYPE_64;
for (bar = BAR_0; bar <= BAR_5; bar++) {
epf_bar = &epf->bar[bar];
ret = pci_epc_set_bar(epc, bar, epf_bar->phys_addr,
epf_bar->size, flags);
if (ret) {
pci_epf_free_space(epf, epf_test->reg[bar], bar);
dev_err(dev, "failed to set BAR%d\n", bar);
if (bar == BAR_0)
return ret;
}
}
return 0;
}
static int pci_epf_test_alloc_space(struct pci_epf *epf)
{
struct pci_epf_test *epf_test = epf_get_drvdata(epf);
struct device *dev = &epf->dev;
void *base;
int bar;
base = pci_epf_alloc_space(epf, sizeof(struct pci_epf_test_reg),
BAR_0);
if (!base) {
dev_err(dev, "failed to allocated register space\n");
return -ENOMEM;
}
epf_test->reg[0] = base;
for (bar = BAR_1; bar <= BAR_5; bar++) {
base = pci_epf_alloc_space(epf, bar_size[bar - 1], bar);
if (!base)
dev_err(dev, "failed to allocate space for BAR%d\n",
bar);
epf_test->reg[bar] = base;
}
return 0;
}
static int pci_epf_test_bind(struct pci_epf *epf)
{
int ret;
struct pci_epf_header *header = epf->header;
struct pci_epc *epc = epf->epc;
struct device *dev = &epf->dev;
if (WARN_ON_ONCE(!epc))
return -EINVAL;
ret = pci_epc_write_header(epc, header);
if (ret) {
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");
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