On Wed, Apr 26, 2023 at 04:34:35PM -0400, Frank Li wrote:
> Reused flags as capability register in pci_endpoint_test struct to
> support older driver versions. Save capability flags to 'cap' field
> of struct pci_endpoint_test to prevent reading non-existent address.
>
This won't work, please see below.
> Add three registers: PCIE_ENDPOINT_TEST_DB_BAR, PCIE_ENDPOINT_TEST_DB_ADDR,
> PCIE_ENDPOINT_TEST_DB_DATA.
>
> Write data from PCI_ENDPOINT_TEST_DB_DATA to address from
> PCI_ENDPOINT_TEST_DB_ADDR to trigger doorbell and wait for remote
> endpoint feedback.
"wait for endpoint response"
>
> Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
> ---
> drivers/misc/pci_endpoint_test.c | 41 ++++++++++++++++++++++++++++++++
> include/uapi/linux/pcitest.h | 1 +
> 2 files changed, 42 insertions(+)
>
> diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
> index ed4d0ef5e5c3..3320a3334594 100644
> --- a/drivers/misc/pci_endpoint_test.c
> +++ b/drivers/misc/pci_endpoint_test.c
> @@ -52,6 +52,7 @@
> #define STATUS_IRQ_RAISED BIT(6)
> #define STATUS_SRC_ADDR_INVALID BIT(7)
> #define STATUS_DST_ADDR_INVALID BIT(8)
> +#define STATUS_DOORBELL_SUCCESS BIT(9)
>
> #define PCI_ENDPOINT_TEST_LOWER_SRC_ADDR 0x0c
> #define PCI_ENDPOINT_TEST_UPPER_SRC_ADDR 0x10
> @@ -66,7 +67,12 @@
> #define PCI_ENDPOINT_TEST_IRQ_NUMBER 0x28
>
> #define PCI_ENDPOINT_TEST_FLAGS 0x2c
> +#define PCI_ENDPOINT_TEST_DB_BAR 0x30
> +#define PCI_ENDPOINT_TEST_DB_ADDR 0x34
> +#define PCI_ENDPOINT_TEST_DB_DATA 0x38
> +
> #define FLAG_USE_DMA BIT(0)
> +#define FLAG_SUPPORT_DOORBELL BIT(1)
>
> #define PCI_DEVICE_ID_TI_AM654 0xb00c
> #define PCI_DEVICE_ID_TI_J7200 0xb00f
> @@ -102,6 +108,7 @@ enum pci_barno {
> BAR_3,
> BAR_4,
> BAR_5,
> + NO_BAR = -1,
> };
>
> struct pci_endpoint_test {
> @@ -118,6 +125,7 @@ struct pci_endpoint_test {
> enum pci_barno test_reg_bar;
> size_t alignment;
> const char *name;
> + u32 cap;
> };
>
> struct pci_endpoint_test_data {
> @@ -713,6 +721,35 @@ static bool pci_endpoint_test_set_irq(struct pci_endpoint_test *test,
> return false;
> }
>
> +static bool pci_endpoint_test_doorbell(struct pci_endpoint_test *test)
> +{
> + enum pci_barno bar;
> + u32 data;
> + u32 addr;
> +
> + if (!(test->cap & FLAG_SUPPORT_DOORBELL))
> + return false;
> +
> + bar = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_DB_BAR);
> + if (bar == NO_BAR)
> + return false;
Is this possible?
> +
> + data = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_DB_DATA);
> + addr = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_DB_ADDR);
> + bar = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_DB_BAR);
> +
> + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_STATUS, 0);
> + pci_endpoint_test_bar_writel(test, bar, addr, data);
>From patch 1, I understood that EP supports multiple doorbell. But you are not
making use of it here?
> +
> + wait_for_completion(&test->irq_raised);
> +
No timeout?
> + data = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_STATUS);
> + if (data & STATUS_DOORBELL_SUCCESS)
Please use a separate variable.
> + return true;
> +
> + return false;
> +}
> +
> static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd,
> unsigned long arg)
> {
> @@ -760,6 +797,9 @@ static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd,
> case PCITEST_CLEAR_IRQ:
> ret = pci_endpoint_test_clear_irq(test);
> break;
> + case PCITEST_DOORBELL:
> + ret = pci_endpoint_test_doorbell(test);
> + break;
> }
>
> ret:
> @@ -887,6 +927,7 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
> misc_device->parent = &pdev->dev;
> misc_device->fops = &pci_endpoint_test_fops;
>
> + test->cap = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_FLAGS);
This register will be overwritten by this driver during (copy,read,write) tests.
So this logic will not work.
- Mani
> err = misc_register(misc_device);
> if (err) {
> dev_err(dev, "Failed to register device\n");
> diff --git a/include/uapi/linux/pcitest.h b/include/uapi/linux/pcitest.h
> index f9c1af8d141b..479ca1aa3ae0 100644
> --- a/include/uapi/linux/pcitest.h
> +++ b/include/uapi/linux/pcitest.h
> @@ -20,6 +20,7 @@
> #define PCITEST_SET_IRQTYPE _IOW('P', 0x8, int)
> #define PCITEST_GET_IRQTYPE _IO('P', 0x9)
> #define PCITEST_CLEAR_IRQ _IO('P', 0x10)
> +#define PCITEST_DOORBELL _IO('P', 0x11)
>
> #define PCITEST_FLAGS_USE_DMA 0x00000001
>
> --
> 2.34.1
>
--
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