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
|
|
@ -26,4 +26,6 @@ config PCI_ENDPOINT_CONFIGFS
|
|||
configure the endpoint function and used to bind the
|
||||
function with a endpoint controller.
|
||||
|
||||
source "drivers/pci/endpoint/functions/Kconfig"
|
||||
|
||||
endmenu
|
||||
|
|
|
|||
|
|
@ -4,4 +4,4 @@
|
|||
|
||||
obj-$(CONFIG_PCI_ENDPOINT_CONFIGFS) += pci-ep-cfs.o
|
||||
obj-$(CONFIG_PCI_ENDPOINT) += pci-epc-core.o pci-epf-core.o\
|
||||
pci-epc-mem.o
|
||||
pci-epc-mem.o functions/
|
||||
|
|
|
|||
|
|
@ -0,0 +1,12 @@
|
|||
#
|
||||
# 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.
|
||||
|
|
@ -0,0 +1,5 @@
|
|||
#
|
||||
# Makefile for PCI Endpoint Functions
|
||||
#
|
||||
|
||||
obj-$(CONFIG_PCI_EPF_TEST) += pci-epf-test.o
|
||||
|
|
@ -0,0 +1,510 @@
|
|||
/**
|
||||
* 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");
|
||||
Loading…
Reference in New Issue