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pci_endpoint_test: Add 2 ioctl commands
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Add MSI-X support and update driver documentation accordingly.

Add 2 new IOCTL commands:
 - Allow to reconfigure driver IRQ type in runtime.
 - Allow to retrieve current driver IRQ type configured.

Add IRQ type validation before executing the READ/WRITE/COPY tests.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
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@gustavoSNPS
gustavoSNPS authored and Lorenzo Pieralisi committed Jul 19, 2018
1 parent c2e00e3 commit e033271
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Showing 4 changed files with 165 additions and 48 deletions.
2 changes: 1 addition & 1 deletion Documentation/ioctl/ioctl-number.txt
View file
Expand Up @@ -166,7 +166,7 @@ Code Seq#(hex) Include File Comments
'P' all linux/soundcard.h conflict!
'P' 60-6F sound/sscape_ioctl.h conflict!
'P' 00-0F drivers/usb/class/usblp.c conflict!
'P' 01-07 drivers/misc/pci_endpoint_test.c conflict!
'P' 01-09 drivers/misc/pci_endpoint_test.c conflict!
'Q' all linux/soundcard.h
'R' 00-1F linux/random.h conflict!
'R' 01 linux/rfkill.h conflict!
Expand Down
3 changes: 3 additions & 0 deletions Documentation/misc-devices/pci-endpoint-test.txt
View file
Expand Up @@ -28,6 +28,9 @@ ioctl
to be tested should be passed as argument.
PCITEST_MSIX: Tests message signalled interrupts. The MSI-X number
to be tested should be passed as argument.
PCITEST_SET_IRQTYPE: Changes driver IRQ type configuration. The IRQ type
should be passed as argument (0: Legacy, 1:MSI, 2:MSI-X).
PCITEST_GET_IRQTYPE: Gets driver IRQ type configuration.
PCITEST_WRITE: Perform write tests. The size of the buffer should be passed
as argument.
PCITEST_READ: Perform read tests. The size of the buffer should be passed
Expand Down
206 changes: 159 additions & 47 deletions drivers/misc/pci_endpoint_test.c
View file
Expand Up @@ -37,6 +37,7 @@

#define DRV_MODULE_NAME "pci-endpoint-test"

#define IRQ_TYPE_UNDEFINED -1
#define IRQ_TYPE_LEGACY 0
#define IRQ_TYPE_MSI 1
#define IRQ_TYPE_MSIX 2
Expand Down Expand Up @@ -157,6 +158,100 @@ static irqreturn_t pci_endpoint_test_irqhandler(int irq, void *dev_id)
return IRQ_HANDLED;
}

static void pci_endpoint_test_free_irq_vectors(struct pci_endpoint_test *test)
{
struct pci_dev *pdev = test->pdev;

pci_free_irq_vectors(pdev);
}

static bool pci_endpoint_test_alloc_irq_vectors(struct pci_endpoint_test *test,
int type)
{
int irq = -1;
struct pci_dev *pdev = test->pdev;
struct device *dev = &pdev->dev;
bool res = true;

switch (type) {
case IRQ_TYPE_LEGACY:
irq = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_LEGACY);
if (irq < 0)
dev_err(dev, "Failed to get Legacy interrupt\n");
break;
case IRQ_TYPE_MSI:
irq = pci_alloc_irq_vectors(pdev, 1, 32, PCI_IRQ_MSI);
if (irq < 0)
dev_err(dev, "Failed to get MSI interrupts\n");
break;
case IRQ_TYPE_MSIX:
irq = pci_alloc_irq_vectors(pdev, 1, 2048, PCI_IRQ_MSIX);
if (irq < 0)
dev_err(dev, "Failed to get MSI-X interrupts\n");
break;
default:
dev_err(dev, "Invalid IRQ type selected\n");
}

if (irq < 0) {
irq = 0;
res = false;
}
test->num_irqs = irq;

return res;
}

static void pci_endpoint_test_release_irq(struct pci_endpoint_test *test)
{
int i;
struct pci_dev *pdev = test->pdev;
struct device *dev = &pdev->dev;

for (i = 0; i < test->num_irqs; i++)
devm_free_irq(dev, pci_irq_vector(pdev, i), test);

test->num_irqs = 0;
}

static bool pci_endpoint_test_request_irq(struct pci_endpoint_test *test)
{
int i;
int err;
struct pci_dev *pdev = test->pdev;
struct device *dev = &pdev->dev;

for (i = 0; i < test->num_irqs; i++) {
err = devm_request_irq(dev, pci_irq_vector(pdev, i),
pci_endpoint_test_irqhandler,
IRQF_SHARED, DRV_MODULE_NAME, test);
if (err)
goto fail;
}

return true;

fail:
switch (irq_type) {
case IRQ_TYPE_LEGACY:
dev_err(dev, "Failed to request IRQ %d for Legacy\n",
pci_irq_vector(pdev, i));
break;
case IRQ_TYPE_MSI:
dev_err(dev, "Failed to request IRQ %d for MSI %d\n",
pci_irq_vector(pdev, i),
i + 1);
break;
case IRQ_TYPE_MSIX:
dev_err(dev, "Failed to request IRQ %d for MSI-X %d\n",
pci_irq_vector(pdev, i),
i + 1);
break;
}

return false;
}

static bool pci_endpoint_test_bar(struct pci_endpoint_test *test,
enum pci_barno barno)
{
Expand Down Expand Up @@ -247,6 +342,11 @@ static bool pci_endpoint_test_copy(struct pci_endpoint_test *test, size_t size)
if (size > SIZE_MAX - alignment)
goto err;

if (irq_type < IRQ_TYPE_LEGACY || irq_type > IRQ_TYPE_MSIX) {
dev_err(dev, "Invalid IRQ type option\n");
goto err;
}

orig_src_addr = dma_alloc_coherent(dev, size + alignment,
&orig_src_phys_addr, GFP_KERNEL);
if (!orig_src_addr) {
Expand Down Expand Up @@ -337,6 +437,11 @@ static bool pci_endpoint_test_write(struct pci_endpoint_test *test, size_t size)
if (size > SIZE_MAX - alignment)
goto err;

if (irq_type < IRQ_TYPE_LEGACY || irq_type > IRQ_TYPE_MSIX) {
dev_err(dev, "Invalid IRQ type option\n");
goto err;
}

orig_addr = dma_alloc_coherent(dev, size + alignment, &orig_phys_addr,
GFP_KERNEL);
if (!orig_addr) {
Expand Down Expand Up @@ -400,6 +505,11 @@ static bool pci_endpoint_test_read(struct pci_endpoint_test *test, size_t size)
if (size > SIZE_MAX - alignment)
goto err;

if (irq_type < IRQ_TYPE_LEGACY || irq_type > IRQ_TYPE_MSIX) {
dev_err(dev, "Invalid IRQ type option\n");
goto err;
}

orig_addr = dma_alloc_coherent(dev, size + alignment, &orig_phys_addr,
GFP_KERNEL);
if (!orig_addr) {
Expand Down Expand Up @@ -440,6 +550,38 @@ static bool pci_endpoint_test_read(struct pci_endpoint_test *test, size_t size)
return ret;
}

static bool pci_endpoint_test_set_irq(struct pci_endpoint_test *test,
int req_irq_type)
{
struct pci_dev *pdev = test->pdev;
struct device *dev = &pdev->dev;

if (req_irq_type < IRQ_TYPE_LEGACY || req_irq_type > IRQ_TYPE_MSIX) {
dev_err(dev, "Invalid IRQ type option\n");
return false;
}

if (irq_type == req_irq_type)
return true;

pci_endpoint_test_release_irq(test);
pci_endpoint_test_free_irq_vectors(test);

if (!pci_endpoint_test_alloc_irq_vectors(test, req_irq_type))
goto err;

if (!pci_endpoint_test_request_irq(test))
goto err;

irq_type = req_irq_type;
return true;

err:
pci_endpoint_test_free_irq_vectors(test);
irq_type = IRQ_TYPE_UNDEFINED;
return false;
}

static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
Expand Down Expand Up @@ -471,6 +613,12 @@ static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd,
case PCITEST_COPY:
ret = pci_endpoint_test_copy(test, arg);
break;
case PCITEST_SET_IRQTYPE:
ret = pci_endpoint_test_set_irq(test, arg);
break;
case PCITEST_GET_IRQTYPE:
ret = irq_type;
break;
}

ret:
Expand All @@ -486,9 +634,7 @@ static const struct file_operations pci_endpoint_test_fops = {
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;
Expand Down Expand Up @@ -537,41 +683,11 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,

pci_set_master(pdev);

switch (irq_type) {
case IRQ_TYPE_LEGACY:
break;
case IRQ_TYPE_MSI:
irq = pci_alloc_irq_vectors(pdev, 1, 32, PCI_IRQ_MSI);
if (irq < 0)
dev_err(dev, "Failed to get MSI interrupts\n");
test->num_irqs = irq;
break;
case IRQ_TYPE_MSIX:
irq = pci_alloc_irq_vectors(pdev, 1, 2048, PCI_IRQ_MSIX);
if (irq < 0)
dev_err(dev, "Failed to get MSI-X interrupts\n");
test->num_irqs = irq;
break;
default:
dev_err(dev, "Invalid IRQ type selected\n");
}
if (!pci_endpoint_test_alloc_irq_vectors(test, irq_type))
goto err_disable_irq;

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, pci_irq_vector(pdev, i),
pci_endpoint_test_irqhandler,
IRQF_SHARED, DRV_MODULE_NAME, test);
if (err)
dev_err(dev, "Failed to request IRQ %d for MSI%s %d\n",
pci_irq_vector(pdev, i),
irq_type == IRQ_TYPE_MSIX ? "-X" : "", i + 1);
}
if (!pci_endpoint_test_request_irq(test))
goto err_disable_irq;

for (bar = BAR_0; bar <= BAR_5; bar++) {
if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) {
Expand Down Expand Up @@ -630,13 +746,10 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
if (test->bar[bar])
pci_iounmap(pdev, test->bar[bar]);
}
pci_endpoint_test_release_irq(test);

for (i = 0; i < irq; i++)
devm_free_irq(&pdev->dev, pci_irq_vector(pdev, i), test);

err_disable_msi:
pci_disable_msi(pdev);
pci_disable_msix(pdev);
err_disable_irq:
pci_endpoint_test_free_irq_vectors(test);
pci_release_regions(pdev);

err_disable_pdev:
Expand All @@ -648,7 +761,6 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
static void pci_endpoint_test_remove(struct pci_dev *pdev)
{
int id;
int i;
enum pci_barno bar;
struct pci_endpoint_test *test = pci_get_drvdata(pdev);
struct miscdevice *misc_device = &test->miscdev;
Expand All @@ -665,10 +777,10 @@ static void pci_endpoint_test_remove(struct pci_dev *pdev)
if (test->bar[bar])
pci_iounmap(pdev, test->bar[bar]);
}
for (i = 0; i < test->num_irqs; i++)
devm_free_irq(&pdev->dev, pci_irq_vector(pdev, i), test);
pci_disable_msi(pdev);
pci_disable_msix(pdev);

pci_endpoint_test_release_irq(test);
pci_endpoint_test_free_irq_vectors(test);

pci_release_regions(pdev);
pci_disable_device(pdev);
}
Expand Down
2 changes: 2 additions & 0 deletions include/uapi/linux/pcitest.h
View file
Expand Up @@ -17,5 +17,7 @@
#define PCITEST_READ _IOW('P', 0x5, unsigned long)
#define PCITEST_COPY _IOW('P', 0x6, unsigned long)
#define PCITEST_MSIX _IOW('P', 0x7, int)
#define PCITEST_SET_IRQTYPE _IOW('P', 0x8, int)
#define PCITEST_GET_IRQTYPE _IO('P', 0x9)

#endif /* __UAPI_LINUX_PCITEST_H */

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