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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Using bit 0..7 of magic as version number in pci_endpoint_test struct to support older driver versions. Save to 'version' field of struct pci_endpoint_test to prevent reading non-existent address. 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 endpoint feedback. Signed-off-by: Frank Li --- drivers/misc/pci_endpoint_test.c | 48 ++++++++++++++++++++++++++++++++ include/uapi/linux/pcitest.h | 1 + 2 files changed, 49 insertions(+) diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c index ed4d0ef5e5c31..ed0b025132d17 100644 --- a/drivers/misc/pci_endpoint_test.c +++ b/drivers/misc/pci_endpoint_test.c @@ -33,6 +33,8 @@ #define IRQ_TYPE_MSIX 2 #define PCI_ENDPOINT_TEST_MAGIC 0x0 +#define PCI_MAGIC_VERSION_MASK GENMASK(7, 0) +#define PCI_ENDPOINT_TEST_V1 0x1 #define PCI_ENDPOINT_TEST_COMMAND 0x4 #define COMMAND_RAISE_LEGACY_IRQ BIT(0) @@ -52,6 +54,7 @@ #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 +69,12 @@ #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 +110,7 @@ enum pci_barno { BAR_3, BAR_4, BAR_5, + NO_BAR = -1, }; struct pci_endpoint_test { @@ -118,6 +127,7 @@ struct pci_endpoint_test { enum pci_barno test_reg_bar; size_t alignment; const char *name; + u8 version; }; struct pci_endpoint_test_data { @@ -713,6 +723,38 @@ 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, status; + u32 addr; + + if (test->version < PCI_ENDPOINT_TEST_V1) + return false; + + bar = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_DB_BAR); + if (bar == NO_BAR) + return false; + + 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_IRQ_TYPE, irq_type); + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_NUMBER, 1); + + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_STATUS, 0); + pci_endpoint_test_bar_writel(test, bar, addr, data); + + wait_for_completion_timeout(&test->irq_raised, msecs_to_jiffies(1000)); + + status = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_STATUS); + if (status & STATUS_DOORBELL_SUCCESS) + return true; + + return false; +} + static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { @@ -760,6 +802,9 @@ 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 +932,9 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev, misc_device->parent = &pdev->dev; misc_device->fops = &pci_endpoint_test_fops; + test->version = FIELD_GET(PCI_MAGIC_VERSION_MASK, + pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_MAGIC)); + 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 f9c1af8d141b4..479ca1aa3ae0b 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel