blob: 63ed706445b9f33a532ab8f7b8ba4597a88c02d9 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/**
* Test driver to test endpoint functionality
*
* Copyright (C) 2017 Texas Instruments
* Author: Kishon Vijay Abraham I <kishon@ti.com>
*/
#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;
enum pci_barno test_reg_bar;
bool linkup_notifier;
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,
};
struct pci_epf_test_data {
enum pci_barno test_reg_bar;
bool linkup_notifier;
};
static size_t bar_size[] = { 512, 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;
enum pci_barno test_reg_bar = epf_test->test_reg_bar;
struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar];
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, epf->func_no, 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, epf->func_no, 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, epf->func_no, 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, epf->func_no, 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;
enum pci_barno test_reg_bar = epf_test->test_reg_bar;
struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar];
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, epf->func_no, 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, epf->func_no, 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;
enum pci_barno test_reg_bar = epf_test->test_reg_bar;
struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar];
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, epf->func_no, 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.
*/
usleep_range(1000, 2000);
kfree(buf);
err_map_addr:
pci_epc_unmap_addr(epc, epf->func_no, 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;
enum pci_barno test_reg_bar = epf_test->test_reg_bar;
struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar];
reg->status |= STATUS_IRQ_RAISED;
msi_count = pci_epc_get_msi(epc, epf->func_no);
if (irq > msi_count || msi_count <= 0)
pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_LEGACY, 0);
else
pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_MSI, irq);
}
static void pci_epf_test_cmd_handler(struct work_struct *work)
{
int ret;
u8 irq;
u8 msi_count;
u32 command;
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;
enum pci_barno test_reg_bar = epf_test->test_reg_bar;
struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar];
command = reg->command;
if (!command)
goto reset_handler;
reg->command = 0;
reg->status = 0;
irq = (command & MSI_NUMBER_MASK) >> MSI_NUMBER_SHIFT;
if (command & COMMAND_RAISE_LEGACY_IRQ) {
reg->status = STATUS_IRQ_RAISED;
pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_LEGACY, 0);
goto reset_handler;
}
if (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, irq);
goto reset_handler;
}
if (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, irq);
goto reset_handler;
}
if (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, irq);
goto reset_handler;
}
if (command & COMMAND_RAISE_MSI_IRQ) {
msi_count = pci_epc_get_msi(epc, epf->func_no);
if (irq > msi_count || msi_count <= 0)
goto reset_handler;
reg->status = STATUS_IRQ_RAISED;
pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_MSI, irq);
goto reset_handler;
}
reset_handler:
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;
struct pci_epf_bar *epf_bar;
int bar;
cancel_delayed_work(&epf_test->cmd_handler);
pci_epc_stop(epc);
for (bar = BAR_0; bar <= BAR_5; bar++) {
epf_bar = &epf->bar[bar];
if (epf_test->reg[bar]) {
pci_epf_free_space(epf, epf_test->reg[bar], bar);
pci_epc_clear_bar(epc, epf->func_no, epf_bar);
}
}
}
static int pci_epf_test_set_bar(struct pci_epf *epf)
{
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);
enum pci_barno test_reg_bar = epf_test->test_reg_bar;
for (bar = BAR_0; bar <= BAR_5; bar++) {
epf_bar = &epf->bar[bar];
epf_bar->flags |= upper_32_bits(epf_bar->size) ?
PCI_BASE_ADDRESS_MEM_TYPE_64 :
PCI_BASE_ADDRESS_MEM_TYPE_32;
ret = pci_epc_set_bar(epc, epf->func_no, epf_bar);
if (ret) {
pci_epf_free_space(epf, epf_test->reg[bar], bar);
dev_err(dev, "Failed to set BAR%d\n", bar);
if (bar == test_reg_bar)
return ret;
}
/*
* pci_epc_set_bar() sets PCI_BASE_ADDRESS_MEM_TYPE_64
* if the specific implementation required a 64-bit BAR,
* even if we only requested a 32-bit BAR.
*/
if (epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64)
bar++;
}
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;
enum pci_barno test_reg_bar = epf_test->test_reg_bar;
base = pci_epf_alloc_space(epf, sizeof(struct pci_epf_test_reg),
test_reg_bar);
if (!base) {
dev_err(dev, "Failed to allocated register space\n");
return -ENOMEM;
}
epf_test->reg[test_reg_bar] = base;
for (bar = BAR_0; bar <= BAR_5; bar++) {
if (bar == test_reg_bar)
continue;
base = pci_epf_alloc_space(epf, bar_size[bar], 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_test *epf_test = epf_get_drvdata(epf);
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;
if (epc->features & EPC_FEATURE_NO_LINKUP_NOTIFIER)
epf_test->linkup_notifier = false;
else
epf_test->linkup_notifier = true;
epf_test->test_reg_bar = EPC_FEATURE_GET_BAR(epc->features);
ret = pci_epc_write_header(epc, epf->func_no, 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->func_no, epf->msi_interrupts);
if (ret)
return ret;
if (!epf_test->linkup_notifier)
queue_work(kpcitest_workqueue, &epf_test->cmd_handler.work);
return 0;
}
static const struct pci_epf_device_id pci_epf_test_ids[] = {
{
.name = "pci_epf_test",
},
{},
};
static int pci_epf_test_probe(struct pci_epf *epf)
{
struct pci_epf_test *epf_test;
struct device *dev = &epf->dev;
const struct pci_epf_device_id *match;
struct pci_epf_test_data *data;
enum pci_barno test_reg_bar = BAR_0;
bool linkup_notifier = true;
match = pci_epf_match_device(pci_epf_test_ids, epf);
data = (struct pci_epf_test_data *)match->driver_data;
if (data) {
test_reg_bar = data->test_reg_bar;
linkup_notifier = data->linkup_notifier;
}
epf_test = devm_kzalloc(dev, sizeof(*epf_test), GFP_KERNEL);
if (!epf_test)
return -ENOMEM;
epf->header = &test_header;
epf_test->epf = epf;
epf_test->test_reg_bar = test_reg_bar;
epf_test->linkup_notifier = linkup_notifier;
INIT_DELAYED_WORK(&epf_test->cmd_handler, pci_epf_test_cmd_handler);
epf_set_drvdata(epf, 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 struct pci_epf_driver test_driver = {
.driver.name = "pci_epf_test",
.probe = pci_epf_test_probe,
.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");