Re: [PATCH v4 09/10] pci_endpoint_test: Add 2 ioctl commands
From: Gustavo Pimentel
Date: Wed Jun 20 2018 - 10:30:45 EST
Hi,
On 20/06/2018 08:58, Kishon Vijay Abraham I wrote:
> 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@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.
>> 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?
That could work for the legacy/MSI/MSI-X tests, but not for the Write/Read/Copy
tests... From what I saw, it was possible to perform Write/Read/Copy tests with
either legacy or MSI on the previous version. I'm assuming that you don't wanna
to lose that functionalities, right?
Regards,
Gustavo
>
> Thanks
> Kishon
>