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Message-ID: <327bcbd0-b2a0-d1eb-5471-e6e63169fc8d@ti.com>
Date: Wed, 20 Jun 2018 13:28:03 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
<bhelgaas@...gle.com>, <lorenzo.pieralisi@....com>,
<Joao.Pinto@...opsys.com>, <jingoohan1@...il.com>,
<adouglas@...ence.com>, <jesper.nilsson@...s.com>
CC: <linux-pci@...r.kernel.org>, <linux-doc@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 09/10] pci_endpoint_test: Add 2 ioctl commands
Hi,
On Monday 18 June 2018 08:30 PM, Gustavo Pimentel wrote:
> 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.
>
> Signed-off-by: Gustavo Pimentel <gustavo.pimentel@...opsys.com>
> ---
> 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.
>
> Documentation/misc-devices/pci-endpoint-test.txt | 3 +
> drivers/misc/pci_endpoint_test.c | 177 +++++++++++++++++------
> 2 files changed, 132 insertions(+), 48 deletions(-)
>
> 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 8d15dbe..df2017f 100644
> --- a/drivers/misc/pci_endpoint_test.c
> +++ b/drivers/misc/pci_endpoint_test.c
> @@ -157,6 +157,87 @@ 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 irq = -1;
> + struct pci_dev *pdev = test->pdev;
> + struct device *dev = &pdev->dev;
> + bool res = true;
> +
> + switch (irq_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)
> {
> @@ -440,6 +521,38 @@ 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;
> +
> + irq_type = req_irq_type;
> +
> + pci_endpoint_test_free_irq_vectors(test);
> + pci_endpoint_test_release_irq(test);
> +
> + if (!pci_endpoint_test_alloc_irq_vectors(test)) {
> + pci_endpoint_test_release_irq(test);
> + return false;
> + }
> +
> + if (!pci_endpoint_test_request_irq(test)) {
> + pci_endpoint_test_release_irq(test);
> + return false;
> + }
> +
> + return true;
> +}
> +
> static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd,
> unsigned long arg)
> {
> @@ -471,6 +584,12 @@ 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;
Can't the set_irq be done as part of raise irq itself?
Thanks
Kishon
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