[PATCH v3 08/10] pci-epf-test/pci_endpoint_test: Add MSI-X support

From: Gustavo Pimentel
Date: Fri Jun 08 2018 - 04:22:18 EST

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Add MSI-X support and update driver documentation accordingly.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@xxxxxxxxxxxx>
---
Change v2->v3:
- New patch file created base on the previous patch
"misc: pci_endpoint_test: Add MSI-X support" patch file following
Kishon's suggestion.

Documentation/misc-devices/pci-endpoint-test.txt | 3 +++
drivers/misc/pci_endpoint_test.c | 28 ++++++++++++++++++------
drivers/pci/endpoint/functions/pci-epf-test.c | 23 ++++++++++++++++++-
3 files changed, 46 insertions(+), 8 deletions(-)

diff --git a/Documentation/misc-devices/pci-endpoint-test.txt b/Documentation/misc-devices/pci-endpoint-test.txt
index 4ebc359..fdfa0f6 100644
--- a/Documentation/misc-devices/pci-endpoint-test.txt
+++ b/Documentation/misc-devices/pci-endpoint-test.txt
@@ -10,6 +10,7 @@ The PCI driver for the test device performs the following tests
*) verifying addresses programmed in BAR
*) raise legacy IRQ
*) raise MSI IRQ
+ *) raise MSI-X IRQ
*) read data
*) write data
*) copy data
@@ -25,6 +26,8 @@ ioctl
PCITEST_LEGACY_IRQ: Tests legacy IRQ
PCITEST_MSI: Tests message signalled interrupts. The MSI number
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_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
diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index 8f2061a..8d15dbe 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -39,12 +39,14 @@

#define IRQ_TYPE_LEGACY 0
#define IRQ_TYPE_MSI 1
+#define IRQ_TYPE_MSIX 2

#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 COMMAND_RAISE_MSIX_IRQ BIT(2)
#define COMMAND_READ BIT(3)
#define COMMAND_WRITE BIT(4)
#define COMMAND_COPY BIT(5)
@@ -83,7 +85,7 @@ MODULE_PARM_DESC(no_msi, "Disable MSI interrupt in pci_endpoint_test");

static int irq_type = IRQ_TYPE_MSI;
module_param(irq_type, int, 0444);
-MODULE_PARM_DESC(irq_type, "IRQ mode selection in pci_endpoint_test (0 - Legacy, 1 - MSI)");
+MODULE_PARM_DESC(irq_type, "IRQ mode selection in pci_endpoint_test (0 - Legacy, 1 - MSI, 2 - MSI-X)");

enum pci_barno {
BAR_0,
@@ -201,16 +203,18 @@ static bool pci_endpoint_test_legacy_irq(struct pci_endpoint_test *test)
}

static bool pci_endpoint_test_msi_irq(struct pci_endpoint_test *test,
- u8 irq_num)
+ u16 irq_num, bool msix)
{
u32 val;
struct pci_dev *pdev = test->pdev;

pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_TYPE,
- IRQ_TYPE_MSI);
+ msix == false ? IRQ_TYPE_MSI :
+ IRQ_TYPE_MSIX);
pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_NUMBER, irq_num);
pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND,
- COMMAND_RAISE_MSI_IRQ);
+ msix == false ? COMMAND_RAISE_MSI_IRQ :
+ COMMAND_RAISE_MSIX_IRQ);
val = wait_for_completion_timeout(&test->irq_raised,
msecs_to_jiffies(1000));
if (!val)
@@ -455,7 +459,8 @@ static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd,
ret = pci_endpoint_test_legacy_irq(test);
break;
case PCITEST_MSI:
- ret = pci_endpoint_test_msi_irq(test, arg);
+ case PCITEST_MSIX:
+ ret = pci_endpoint_test_msi_irq(test, arg, cmd == PCITEST_MSIX);
break;
case PCITEST_WRITE:
ret = pci_endpoint_test_write(test, arg);
@@ -542,6 +547,12 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
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");
}
@@ -559,8 +570,9 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
pci_endpoint_test_irqhandler,
IRQF_SHARED, DRV_MODULE_NAME, test);
if (err)
- dev_err(dev, "failed to request IRQ %d for MSI %d\n",
- pci_irq_vector(pdev, i), i + 1);
+ 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);
}

for (bar = BAR_0; bar <= BAR_5; bar++) {
@@ -626,6 +638,7 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,

err_disable_msi:
pci_disable_msi(pdev);
+ pci_disable_msix(pdev);
pci_release_regions(pdev);

err_disable_pdev:
@@ -657,6 +670,7 @@ static void pci_endpoint_test_remove(struct pci_dev *pdev)
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_release_regions(pdev);
pci_disable_device(pdev);
}
diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index ff92524..bfef6d1 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -20,9 +20,11 @@

#define IRQ_TYPE_LEGACY 0
#define IRQ_TYPE_MSI 1
+#define IRQ_TYPE_MSIX 2

#define COMMAND_RAISE_LEGACY_IRQ BIT(0)
#define COMMAND_RAISE_MSI_IRQ BIT(1)
+#define COMMAND_RAISE_MSIX_IRQ BIT(2)
#define COMMAND_READ BIT(3)
#define COMMAND_WRITE BIT(4)
#define COMMAND_COPY BIT(5)
@@ -265,6 +267,9 @@ static void pci_epf_test_raise_irq(struct pci_epf_test *epf_test, u8 irq_type,
case IRQ_TYPE_MSI:
pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_MSI, irq);
break;
+ case IRQ_TYPE_MSIX:
+ pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_MSIX, irq);
+ break;
default:
dev_err(dev, "Failed to raise IRQ, unknown type\n");
break;
@@ -291,7 +296,7 @@ static void pci_epf_test_cmd_handler(struct work_struct *work)
reg->command = 0;
reg->status = 0;

- if (reg->irq_type > IRQ_TYPE_MSI) {
+ if (reg->irq_type > IRQ_TYPE_MSIX) {
dev_err(dev, "Failed to detect IRQ type\n");
goto reset_handler;
}
@@ -345,6 +350,16 @@ static void pci_epf_test_cmd_handler(struct work_struct *work)
goto reset_handler;
}

+ if (command & COMMAND_RAISE_MSIX_IRQ) {
+ count = pci_epc_get_msix(epc, epf->func_no);
+ if (reg->irq_number > count || count <= 0)
+ goto reset_handler;
+ reg->status = STATUS_IRQ_RAISED;
+ pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_MSIX,
+ reg->irq_number);
+ goto reset_handler;
+ }
+
reset_handler:
queue_delayed_work(kpcitest_workqueue, &epf_test->cmd_handler,
msecs_to_jiffies(1));
@@ -480,6 +495,12 @@ static int pci_epf_test_bind(struct pci_epf *epf)
return ret;
}

+ ret = pci_epc_set_msix(epc, epf->func_no, epf->msix_interrupts);
+ if (ret) {
+ dev_err(dev, "MSI-X configuration failed\n");
+ return ret;
+ }
+
if (!epf_test->linkup_notifier)
queue_work(kpcitest_workqueue, &epf_test->cmd_handler.work);

--
2.7.4

Next message: Gustavo Pimentel: "[PATCH v3 10/10] tools: PCI: Add MSI-X support"
Previous message: Gustavo Pimentel: "[PATCH v3 05/10] PCI: dwc: Add legacy interrupt callback handler"
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Next in thread: Gustavo Pimentel: "[PATCH v3 10/10] tools: PCI: Add MSI-X support"
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