linux/drivers/misc/pci_endpoint_test.c
Kishon Vijay Abraham I 0c8a5f9d89 misc: pci_endpoint_test: Enable/Disable MSI using module param
In certain platforms like TI's DRA7 SoCs, use of legacy PCI interrupt is
exclusive with use of MSI (Section 24.9.4.6.2.1 Legacy PCI Interrupts in
http://www.ti.com/lit/ug/spruhz6i/spruhz6i.pdf).

However pci_endpoint_test driver enables MSI by default in probe.  In order
for pci_endpoint_test to be able to test legacy interrupt, MSI should be
disabled. Add a module param 'no_msi' to disable MSI (only when legacy
interrupt has to be tested).

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
[bhelgaas: folded in static fix from Colin Ian King <colin.king@canonical.com>]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2017-08-29 16:00:40 -05:00

621 lines
15 KiB
C

/**
* Host side 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/fs.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/pci_regs.h>
#include <uapi/linux/pcitest.h>
#define DRV_MODULE_NAME "pci-endpoint-test"
#define PCI_ENDPOINT_TEST_MAGIC 0x0
#define PCI_ENDPOINT_TEST_COMMAND 0x4
#define COMMAND_RAISE_LEGACY_IRQ BIT(0)
#define COMMAND_RAISE_MSI_IRQ BIT(1)
#define MSI_NUMBER_SHIFT 2
/* 6 bits for MSI number */
#define COMMAND_READ BIT(8)
#define COMMAND_WRITE BIT(9)
#define COMMAND_COPY BIT(10)
#define PCI_ENDPOINT_TEST_STATUS 0x8
#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 PCI_ENDPOINT_TEST_LOWER_SRC_ADDR 0xc
#define PCI_ENDPOINT_TEST_UPPER_SRC_ADDR 0x10
#define PCI_ENDPOINT_TEST_LOWER_DST_ADDR 0x14
#define PCI_ENDPOINT_TEST_UPPER_DST_ADDR 0x18
#define PCI_ENDPOINT_TEST_SIZE 0x1c
#define PCI_ENDPOINT_TEST_CHECKSUM 0x20
static DEFINE_IDA(pci_endpoint_test_ida);
#define to_endpoint_test(priv) container_of((priv), struct pci_endpoint_test, \
miscdev)
static bool no_msi;
module_param(no_msi, bool, 0444);
MODULE_PARM_DESC(no_msi, "Disable MSI interrupt in pci_endpoint_test");
enum pci_barno {
BAR_0,
BAR_1,
BAR_2,
BAR_3,
BAR_4,
BAR_5,
};
struct pci_endpoint_test {
struct pci_dev *pdev;
void __iomem *base;
void __iomem *bar[6];
struct completion irq_raised;
int last_irq;
/* mutex to protect the ioctls */
struct mutex mutex;
struct miscdevice miscdev;
enum pci_barno test_reg_bar;
size_t alignment;
};
struct pci_endpoint_test_data {
enum pci_barno test_reg_bar;
size_t alignment;
bool no_msi;
};
static inline u32 pci_endpoint_test_readl(struct pci_endpoint_test *test,
u32 offset)
{
return readl(test->base + offset);
}
static inline void pci_endpoint_test_writel(struct pci_endpoint_test *test,
u32 offset, u32 value)
{
writel(value, test->base + offset);
}
static inline u32 pci_endpoint_test_bar_readl(struct pci_endpoint_test *test,
int bar, int offset)
{
return readl(test->bar[bar] + offset);
}
static inline void pci_endpoint_test_bar_writel(struct pci_endpoint_test *test,
int bar, u32 offset, u32 value)
{
writel(value, test->bar[bar] + offset);
}
static irqreturn_t pci_endpoint_test_irqhandler(int irq, void *dev_id)
{
struct pci_endpoint_test *test = dev_id;
u32 reg;
reg = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_STATUS);
if (reg & STATUS_IRQ_RAISED) {
test->last_irq = irq;
complete(&test->irq_raised);
reg &= ~STATUS_IRQ_RAISED;
}
pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_STATUS,
reg);
return IRQ_HANDLED;
}
static bool pci_endpoint_test_bar(struct pci_endpoint_test *test,
enum pci_barno barno)
{
int j;
u32 val;
int size;
struct pci_dev *pdev = test->pdev;
if (!test->bar[barno])
return false;
size = pci_resource_len(pdev, barno);
if (barno == test->test_reg_bar)
size = 0x4;
for (j = 0; j < size; j += 4)
pci_endpoint_test_bar_writel(test, barno, j, 0xA0A0A0A0);
for (j = 0; j < size; j += 4) {
val = pci_endpoint_test_bar_readl(test, barno, j);
if (val != 0xA0A0A0A0)
return false;
}
return true;
}
static bool pci_endpoint_test_legacy_irq(struct pci_endpoint_test *test)
{
u32 val;
pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND,
COMMAND_RAISE_LEGACY_IRQ);
val = wait_for_completion_timeout(&test->irq_raised,
msecs_to_jiffies(1000));
if (!val)
return false;
return true;
}
static bool pci_endpoint_test_msi_irq(struct pci_endpoint_test *test,
u8 msi_num)
{
u32 val;
struct pci_dev *pdev = test->pdev;
pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND,
msi_num << MSI_NUMBER_SHIFT |
COMMAND_RAISE_MSI_IRQ);
val = wait_for_completion_timeout(&test->irq_raised,
msecs_to_jiffies(1000));
if (!val)
return false;
if (test->last_irq - pdev->irq == msi_num - 1)
return true;
return false;
}
static bool pci_endpoint_test_copy(struct pci_endpoint_test *test, size_t size)
{
bool ret = false;
void *src_addr;
void *dst_addr;
dma_addr_t src_phys_addr;
dma_addr_t dst_phys_addr;
struct pci_dev *pdev = test->pdev;
struct device *dev = &pdev->dev;
void *orig_src_addr;
dma_addr_t orig_src_phys_addr;
void *orig_dst_addr;
dma_addr_t orig_dst_phys_addr;
size_t offset;
size_t alignment = test->alignment;
u32 src_crc32;
u32 dst_crc32;
orig_src_addr = dma_alloc_coherent(dev, size + alignment,
&orig_src_phys_addr, GFP_KERNEL);
if (!orig_src_addr) {
dev_err(dev, "failed to allocate source buffer\n");
ret = false;
goto err;
}
if (alignment && !IS_ALIGNED(orig_src_phys_addr, alignment)) {
src_phys_addr = PTR_ALIGN(orig_src_phys_addr, alignment);
offset = src_phys_addr - orig_src_phys_addr;
src_addr = orig_src_addr + offset;
} else {
src_phys_addr = orig_src_phys_addr;
src_addr = orig_src_addr;
}
pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_LOWER_SRC_ADDR,
lower_32_bits(src_phys_addr));
pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_UPPER_SRC_ADDR,
upper_32_bits(src_phys_addr));
get_random_bytes(src_addr, size);
src_crc32 = crc32_le(~0, src_addr, size);
orig_dst_addr = dma_alloc_coherent(dev, size + alignment,
&orig_dst_phys_addr, GFP_KERNEL);
if (!orig_dst_addr) {
dev_err(dev, "failed to allocate destination address\n");
ret = false;
goto err_orig_src_addr;
}
if (alignment && !IS_ALIGNED(orig_dst_phys_addr, alignment)) {
dst_phys_addr = PTR_ALIGN(orig_dst_phys_addr, alignment);
offset = dst_phys_addr - orig_dst_phys_addr;
dst_addr = orig_dst_addr + offset;
} else {
dst_phys_addr = orig_dst_phys_addr;
dst_addr = orig_dst_addr;
}
pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_LOWER_DST_ADDR,
lower_32_bits(dst_phys_addr));
pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_UPPER_DST_ADDR,
upper_32_bits(dst_phys_addr));
pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_SIZE,
size);
pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND,
1 << MSI_NUMBER_SHIFT | COMMAND_COPY);
wait_for_completion(&test->irq_raised);
dst_crc32 = crc32_le(~0, dst_addr, size);
if (dst_crc32 == src_crc32)
ret = true;
dma_free_coherent(dev, size + alignment, orig_dst_addr,
orig_dst_phys_addr);
err_orig_src_addr:
dma_free_coherent(dev, size + alignment, orig_src_addr,
orig_src_phys_addr);
err:
return ret;
}
static bool pci_endpoint_test_write(struct pci_endpoint_test *test, size_t size)
{
bool ret = false;
u32 reg;
void *addr;
dma_addr_t phys_addr;
struct pci_dev *pdev = test->pdev;
struct device *dev = &pdev->dev;
void *orig_addr;
dma_addr_t orig_phys_addr;
size_t offset;
size_t alignment = test->alignment;
u32 crc32;
orig_addr = dma_alloc_coherent(dev, size + alignment, &orig_phys_addr,
GFP_KERNEL);
if (!orig_addr) {
dev_err(dev, "failed to allocate address\n");
ret = false;
goto err;
}
if (alignment && !IS_ALIGNED(orig_phys_addr, alignment)) {
phys_addr = PTR_ALIGN(orig_phys_addr, alignment);
offset = phys_addr - orig_phys_addr;
addr = orig_addr + offset;
} else {
phys_addr = orig_phys_addr;
addr = orig_addr;
}
get_random_bytes(addr, size);
crc32 = crc32_le(~0, addr, size);
pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_CHECKSUM,
crc32);
pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_LOWER_SRC_ADDR,
lower_32_bits(phys_addr));
pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_UPPER_SRC_ADDR,
upper_32_bits(phys_addr));
pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_SIZE, size);
pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND,
1 << MSI_NUMBER_SHIFT | COMMAND_READ);
wait_for_completion(&test->irq_raised);
reg = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_STATUS);
if (reg & STATUS_READ_SUCCESS)
ret = true;
dma_free_coherent(dev, size + alignment, orig_addr, orig_phys_addr);
err:
return ret;
}
static bool pci_endpoint_test_read(struct pci_endpoint_test *test, size_t size)
{
bool ret = false;
void *addr;
dma_addr_t phys_addr;
struct pci_dev *pdev = test->pdev;
struct device *dev = &pdev->dev;
void *orig_addr;
dma_addr_t orig_phys_addr;
size_t offset;
size_t alignment = test->alignment;
u32 crc32;
orig_addr = dma_alloc_coherent(dev, size + alignment, &orig_phys_addr,
GFP_KERNEL);
if (!orig_addr) {
dev_err(dev, "failed to allocate destination address\n");
ret = false;
goto err;
}
if (alignment && !IS_ALIGNED(orig_phys_addr, alignment)) {
phys_addr = PTR_ALIGN(orig_phys_addr, alignment);
offset = phys_addr - orig_phys_addr;
addr = orig_addr + offset;
} else {
phys_addr = orig_phys_addr;
addr = orig_addr;
}
pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_LOWER_DST_ADDR,
lower_32_bits(phys_addr));
pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_UPPER_DST_ADDR,
upper_32_bits(phys_addr));
pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_SIZE, size);
pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND,
1 << MSI_NUMBER_SHIFT | COMMAND_WRITE);
wait_for_completion(&test->irq_raised);
crc32 = crc32_le(~0, addr, size);
if (crc32 == pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_CHECKSUM))
ret = true;
dma_free_coherent(dev, size + alignment, orig_addr, orig_phys_addr);
err:
return ret;
}
static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
int ret = -EINVAL;
enum pci_barno bar;
struct pci_endpoint_test *test = to_endpoint_test(file->private_data);
mutex_lock(&test->mutex);
switch (cmd) {
case PCITEST_BAR:
bar = arg;
if (bar < 0 || bar > 5)
goto ret;
ret = pci_endpoint_test_bar(test, bar);
break;
case PCITEST_LEGACY_IRQ:
ret = pci_endpoint_test_legacy_irq(test);
break;
case PCITEST_MSI:
ret = pci_endpoint_test_msi_irq(test, arg);
break;
case PCITEST_WRITE:
ret = pci_endpoint_test_write(test, arg);
break;
case PCITEST_READ:
ret = pci_endpoint_test_read(test, arg);
break;
case PCITEST_COPY:
ret = pci_endpoint_test_copy(test, arg);
break;
}
ret:
mutex_unlock(&test->mutex);
return ret;
}
static const struct file_operations pci_endpoint_test_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = pci_endpoint_test_ioctl,
};
static int pci_endpoint_test_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
int i;
int err;
int irq = 0;
int id;
char name[20];
enum pci_barno bar;
void __iomem *base;
struct device *dev = &pdev->dev;
struct pci_endpoint_test *test;
struct pci_endpoint_test_data *data;
enum pci_barno test_reg_bar = BAR_0;
struct miscdevice *misc_device;
if (pci_is_bridge(pdev))
return -ENODEV;
test = devm_kzalloc(dev, sizeof(*test), GFP_KERNEL);
if (!test)
return -ENOMEM;
test->test_reg_bar = 0;
test->alignment = 0;
test->pdev = pdev;
data = (struct pci_endpoint_test_data *)ent->driver_data;
if (data) {
test_reg_bar = data->test_reg_bar;
test->alignment = data->alignment;
no_msi = data->no_msi;
}
init_completion(&test->irq_raised);
mutex_init(&test->mutex);
err = pci_enable_device(pdev);
if (err) {
dev_err(dev, "Cannot enable PCI device\n");
return err;
}
err = pci_request_regions(pdev, DRV_MODULE_NAME);
if (err) {
dev_err(dev, "Cannot obtain PCI resources\n");
goto err_disable_pdev;
}
pci_set_master(pdev);
if (!no_msi) {
irq = pci_alloc_irq_vectors(pdev, 1, 32, PCI_IRQ_MSI);
if (irq < 0)
dev_err(dev, "failed to get MSI interrupts\n");
}
err = devm_request_irq(dev, pdev->irq, pci_endpoint_test_irqhandler,
IRQF_SHARED, DRV_MODULE_NAME, test);
if (err) {
dev_err(dev, "failed to request IRQ %d\n", pdev->irq);
goto err_disable_msi;
}
for (i = 1; i < irq; i++) {
err = devm_request_irq(dev, pdev->irq + i,
pci_endpoint_test_irqhandler,
IRQF_SHARED, DRV_MODULE_NAME, test);
if (err)
dev_err(dev, "failed to request IRQ %d for MSI %d\n",
pdev->irq + i, i + 1);
}
for (bar = BAR_0; bar <= BAR_5; bar++) {
base = pci_ioremap_bar(pdev, bar);
if (!base) {
dev_err(dev, "failed to read BAR%d\n", bar);
WARN_ON(bar == test_reg_bar);
}
test->bar[bar] = base;
}
test->base = test->bar[test_reg_bar];
if (!test->base) {
dev_err(dev, "Cannot perform PCI test without BAR%d\n",
test_reg_bar);
goto err_iounmap;
}
pci_set_drvdata(pdev, test);
id = ida_simple_get(&pci_endpoint_test_ida, 0, 0, GFP_KERNEL);
if (id < 0) {
dev_err(dev, "unable to get id\n");
goto err_iounmap;
}
snprintf(name, sizeof(name), DRV_MODULE_NAME ".%d", id);
misc_device = &test->miscdev;
misc_device->minor = MISC_DYNAMIC_MINOR;
misc_device->name = name;
misc_device->fops = &pci_endpoint_test_fops,
err = misc_register(misc_device);
if (err) {
dev_err(dev, "failed to register device\n");
goto err_ida_remove;
}
return 0;
err_ida_remove:
ida_simple_remove(&pci_endpoint_test_ida, id);
err_iounmap:
for (bar = BAR_0; bar <= BAR_5; bar++) {
if (test->bar[bar])
pci_iounmap(pdev, test->bar[bar]);
}
err_disable_msi:
pci_disable_msi(pdev);
pci_release_regions(pdev);
err_disable_pdev:
pci_disable_device(pdev);
return err;
}
static void pci_endpoint_test_remove(struct pci_dev *pdev)
{
int id;
enum pci_barno bar;
struct pci_endpoint_test *test = pci_get_drvdata(pdev);
struct miscdevice *misc_device = &test->miscdev;
if (sscanf(misc_device->name, DRV_MODULE_NAME ".%d", &id) != 1)
return;
misc_deregister(&test->miscdev);
ida_simple_remove(&pci_endpoint_test_ida, id);
for (bar = BAR_0; bar <= BAR_5; bar++) {
if (test->bar[bar])
pci_iounmap(pdev, test->bar[bar]);
}
pci_disable_msi(pdev);
pci_release_regions(pdev);
pci_disable_device(pdev);
}
static const struct pci_device_id pci_endpoint_test_tbl[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_DRA74x) },
{ PCI_DEVICE(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_DRA72x) },
{ }
};
MODULE_DEVICE_TABLE(pci, pci_endpoint_test_tbl);
static struct pci_driver pci_endpoint_test_driver = {
.name = DRV_MODULE_NAME,
.id_table = pci_endpoint_test_tbl,
.probe = pci_endpoint_test_probe,
.remove = pci_endpoint_test_remove,
};
module_pci_driver(pci_endpoint_test_driver);
MODULE_DESCRIPTION("PCI ENDPOINT TEST HOST DRIVER");
MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
MODULE_LICENSE("GPL v2");