Hi, Kishon,

On 17/07/2018 03:43, Kishon Vijay Abraham I wrote:

Hi Gustavo,

On Monday 16 July 2018 08:22 PM, Gustavo Pimentel wrote:

quoted

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 <redacted>
---
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.
Change v3->v4:
 - Rebased to Lorenzo's master branch v4.18-rc1.
Change v4->v5:
 - Nothing changed, just to follow the patch set version.
Change v5->v6:
 - Moved PCITEST_SET_IRQTYPE and PCITEST_GET_IRQTYPE ioctl entries
from patch #10 to here.
 - Increased ioctl parameters range associated to
drivers/misc/pci_endpoint_test.c driver.
Change v6->v7:
 - irq_type variable update just before returning the function.
Change v7->v8:
 - Re-sending the patch series.
Change v8->v9:
 - Added a extra parameter to pci_endpoint_test_alloc_irq_vectors,
that specifies which irq type should be allocated.
Change v9->v10:
 - Fixed bug, report available: https://urldefense.proofpoint.com/v2/url?u=https-3A__lkml.org_lkml_2018_7_16_11&d=DwIC-g&c=DPL6_X_6JkXFx7AXWqB0tg&r=bkWxpLoW-f-E3EdiDCCa0_h0PicsViasSlvIpzZvPxs&m=kfPim9EoIsdNO2BRH1BV6fsKhqV4Qy_JAofUZ2bPmpg&s=sz6k8lKVuC2tpzwc3T-OwE9ShzNwtALcrS_fuJGfiK0&e=
 - Added IRQ type validation before executing the READ/WRITE/COPY
tests.

 Documentation/ioctl/ioctl-number.txt             |   2 +-
 Documentation/misc-devices/pci-endpoint-test.txt |   3 +
 drivers/misc/pci_endpoint_test.c                 | 192 +++++++++++++++++------
 include/uapi/linux/pcitest.h                     |   2 +
 4 files changed, 152 insertions(+), 47 deletions(-)

diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt
index 65259d4..c15c4f3 100644
--- a/Documentation/ioctl/ioctl-number.txt
+++ b/Documentation/ioctl/ioctl-number.txt

@@ -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!

diff --git a/Documentation/misc-devices/pci-endpoint-test.txt b/Documentation/misc-devices/pci-endpoint-test.txt
index fdfa0f6..58ccca4 100644
--- a/Documentation/misc-devices/pci-endpoint-test.txt
+++ b/Documentation/misc-devices/pci-endpoint-test.txt

@@ -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

diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index f4fef10..d909ca5 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c

@@ -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

@@ -157,6 +158,88 @@ 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)
+{
+	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_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 = 0;
+		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)
+{
+	struct pci_dev *pdev = test->pdev;
+
+	pci_disable_msi(pdev);
+	pci_disable_msix(pdev);
+}
+
+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;
+
+	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);
+		return false;
+	}
+
+	for (i = 1; 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)
+			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);
+	}
+
+	return true;
+}
+
 static bool pci_endpoint_test_bar(struct pci_endpoint_test *test,
 				  enum pci_barno barno)
 {

@@ -247,6 +330,11 @@ 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) {

@@ -337,6 +425,11 @@ 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) {

@@ -400,6 +493,11 @@ 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) {

@@ -440,6 +538,38 @@ 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_free_irq_vectors(test);
+	pci_endpoint_test_release_irq(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_release_irq(test);

sorry for not noticing this earlier..

pci_endpoint_test_alloc_irq_vectors enables MSI.. I'd have expected
pci_endpoint_test_free_irq_vectors to disable MSI. Similarly
pci_endpoint_test_request_irq requests irq. Ideally
pci_endpoint_test_release_irq should have freed irq. I feel the contents of
pci_endpoint_test_release_irq() and pci_endpoint_test_free_irq_vectors are swapped.

For the patch itself, I have tested it now and the issue I reported earlier is
not seen in this series.

I just sent the patch series V12 with that swapped.
Please give the Acked for the missing patches #4, #7 and #10 (if you agree) to
close this patch series.

Thanks
Kishon

Regards,
Gustavo
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