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Date: Tue, 24 Apr 2018 06:59:51 +0000
From: Alan Douglas <adouglas@...ence.com>
To: Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
"lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
"Joao.Pinto@...opsys.com" <Joao.Pinto@...opsys.com>,
"jingoohan1@...il.com" <jingoohan1@...il.com>,
"kishon@...com" <kishon@...com>,
"niklas.cassel@...s.com" <niklas.cassel@...s.com>,
"jesper.nilsson@...s.com" <jesper.nilsson@...s.com>
CC: "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [RFC 06/10] misc: pci_endpoint_test: Add MSI-X support
Hi Gustavo,
On 10 April 2018 18:15 Gustavo Pimentel wrote:
>
> Adds the MSI-X support and updates driver documentation accordingly.
>
> Changes the driver parameter in order to allow the interruption type
> selection.
>
> Signed-off-by: Gustavo Pimentel <gustavo.pimentel@...opsys.com>
> ---
> Documentation/misc-devices/pci-endpoint-test.txt | 3 +
> drivers/misc/pci_endpoint_test.c | 102 +++++++++++++++++------
> 2 files changed, 79 insertions(+), 26 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 37db0fc..a7d9354 100644
> --- a/drivers/misc/pci_endpoint_test.c
> +++ b/drivers/misc/pci_endpoint_test.c
> @@ -42,11 +42,16 @@
> #define PCI_ENDPOINT_TEST_COMMAND 0x4
> #define COMMAND_RAISE_LEGACY_IRQ BIT(0)
> #define COMMAND_RAISE_MSI_IRQ BIT(1)
> -#define MSI_NUMBER_SHIFT 2
> -/* 6 bits for MSI number */
> -#define COMMAND_READ BIT(8)
> -#define COMMAND_WRITE BIT(9)
> -#define COMMAND_COPY BIT(10)
> +#define COMMAND_RAISE_MSIX_IRQ BIT(2)
> +#define IRQ_TYPE_SHIFT 3
> +#define IRQ_TYPE_LEGACY 0
> +#define IRQ_TYPE_MSI 1
> +#define IRQ_TYPE_MSIX 2
> +#define MSI_NUMBER_SHIFT 5
> +/* 12 bits for MSI number */
> +#define COMMAND_READ BIT(17)
> +#define COMMAND_WRITE BIT(18)
> +#define COMMAND_COPY BIT(19)
>
> #define PCI_ENDPOINT_TEST_STATUS 0x8
> #define STATUS_READ_SUCCESS BIT(0)
> @@ -73,9 +78,9 @@ static DEFINE_IDA(pci_endpoint_test_ida);
> #define to_endpoint_test(priv) container_of((priv), struct pci_endpoint_test,
> \
> miscdev)
>
> -static bool no_msi;
> -module_param(no_msi, bool, 0444);
> -MODULE_PARM_DESC(no_msi, "Disable MSI interrupt in
> pci_endpoint_test");
> +static int irq_type = IRQ_TYPE_MSIX;
> +module_param(irq_type, int, 0444);
> +MODULE_PARM_DESC(irq_type, "IRQ mode selection in pci_endpoint_test
> (0
> +- Legacy, 1 - MSI, 2 - MSI-X)");
>
> enum pci_barno {
> BAR_0,
> @@ -103,7 +108,7 @@ struct pci_endpoint_test { struct
> pci_endpoint_test_data {
> enum pci_barno test_reg_bar;
> size_t alignment;
> - bool no_msi;
> + int irq_type;
> };
>
> static inline u32 pci_endpoint_test_readl(struct pci_endpoint_test *test,
> @@ -177,10 +182,10 @@ static bool pci_endpoint_test_bar(struct
> pci_endpoint_test *test,
>
> static bool pci_endpoint_test_legacy_irq(struct pci_endpoint_test *test) {
> - u32 val;
> + u32 val = COMMAND_RAISE_LEGACY_IRQ;
>
> - pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND,
> - COMMAND_RAISE_LEGACY_IRQ);
> + val |= (IRQ_TYPE_LEGACY << IRQ_TYPE_SHIFT);
> + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND, val);
> val = wait_for_completion_timeout(&test->irq_raised,
> msecs_to_jiffies(1000));
> if (!val)
> @@ -192,12 +197,12 @@ 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 msi_num)
> {
> - u32 val;
> + u32 val = COMMAND_RAISE_MSI_IRQ;
> struct pci_dev *pdev = test->pdev;
>
> - pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND,
> - msi_num << MSI_NUMBER_SHIFT |
> - COMMAND_RAISE_MSI_IRQ);
> + val |= (msi_num << MSI_NUMBER_SHIFT);
> + val |= (IRQ_TYPE_MSI << IRQ_TYPE_SHIFT);
> + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND, val);
> val = wait_for_completion_timeout(&test->irq_raised,
> msecs_to_jiffies(1000));
> if (!val)
> @@ -209,6 +214,26 @@ static bool pci_endpoint_test_msi_irq(struct
> pci_endpoint_test *test,
> return false;
> }
>
> +static bool pci_endpoint_test_msix_irq(struct pci_endpoint_test *test,
> + u16 msix_num)
> +{
> + u32 val = COMMAND_RAISE_MSIX_IRQ;
> + struct pci_dev *pdev = test->pdev;
> +
> + val |= (msix_num << MSI_NUMBER_SHIFT);
> + val |= (IRQ_TYPE_MSIX << IRQ_TYPE_SHIFT);
> + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND, val);
> + val = wait_for_completion_timeout(&test->irq_raised,
> + msecs_to_jiffies(1000));
> + if (!val)
> + return false;
> +
> + if (test->last_irq - pdev->irq == msix_num - 1)
> + return true;
I think we should use pci_irq_vector() to convert from device vector to Linux IRQ.
It can be done in pci_endpoint_test_irqhandler()
(With MSI, pdev->irq will be updated during MSI init, but it is not for MSI-X.)
pci_irq_vector() should also be used for devm_request_irq() and devm_free_irq()
so some changes required in probe and remove.
Regards,
Alan
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