Commit eefb8379 authored by Frank Li's avatar Frank Li Committed by Bjorn Helgaas
Browse files

misc: pci_endpoint_test: Add doorbell test case 



Add doorbell support with the help of three new registers:
PCIE_ENDPOINT_TEST_DB_BAR, PCIE_ENDPOINT_TEST_DB_ADDR, and
PCIE_ENDPOINT_TEST_DB_DATA.

The testcase works by triggering the doorbell in Endpoint by writing the
value from PCI_ENDPOINT_TEST_DB_DATA register to the address provided by
PCI_ENDPOINT_TEST_DB_OFFSET register of the BAR indicated by the
PCIE_ENDPOINT_TEST_DB_BAR register and waiting for the completion status
from the Endpoint.

Signed-off-by: default avatarFrank Li <Frank.Li@nxp.com>
[mani: removed one spurious change and reworded the commit message]
Signed-off-by: default avatarManivannan Sadhasivam <mani@kernel.org>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Tested-by: default avatarNiklas Cassel <cassel@kernel.org>
Link: https://patch.msgid.link/20250710-ep-msi-v21-7-57683fc7fb25@nxp.com
parent eff0c286

drivers/misc/pci_endpoint_test.c

+83 −0
Original line number Diff line number Diff line
@@ -37,6 +37,8 @@ 
#define COMMAND_READ				BIT(3)

#define COMMAND_WRITE				BIT(4)

#define COMMAND_COPY				BIT(5)

#define COMMAND_ENABLE_DOORBELL			BIT(6)

#define COMMAND_DISABLE_DOORBELL		BIT(7)



#define PCI_ENDPOINT_TEST_STATUS		0x8

#define STATUS_READ_SUCCESS			BIT(0)
@@ -48,6 +50,11 @@ 
#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 STATUS_DOORBELL_ENABLE_SUCCESS		BIT(10)

#define STATUS_DOORBELL_ENABLE_FAIL		BIT(11)

#define STATUS_DOORBELL_DISABLE_SUCCESS		BIT(12)

#define STATUS_DOORBELL_DISABLE_FAIL		BIT(13)



#define PCI_ENDPOINT_TEST_LOWER_SRC_ADDR	0x0c

#define PCI_ENDPOINT_TEST_UPPER_SRC_ADDR	0x10
@@ -62,6 +69,7 @@ 
#define PCI_ENDPOINT_TEST_IRQ_NUMBER		0x28



#define PCI_ENDPOINT_TEST_FLAGS			0x2c



#define FLAG_USE_DMA				BIT(0)



#define PCI_ENDPOINT_TEST_CAPS			0x30
@@ -70,6 +78,10 @@ 
#define CAP_MSIX				BIT(2)

#define CAP_INTX				BIT(3)



#define PCI_ENDPOINT_TEST_DB_BAR		0x34

#define PCI_ENDPOINT_TEST_DB_OFFSET		0x38

#define PCI_ENDPOINT_TEST_DB_DATA		0x3c



#define PCI_DEVICE_ID_TI_AM654			0xb00c

#define PCI_DEVICE_ID_TI_J7200			0xb00f

#define PCI_DEVICE_ID_TI_AM64			0xb010
@@ -100,6 +112,7 @@ enum pci_barno { 
	BAR_3,

	BAR_4,

	BAR_5,

	NO_BAR = -1,

};



struct pci_endpoint_test {
@@ -841,6 +854,73 @@ static int pci_endpoint_test_set_irq(struct pci_endpoint_test *test, 
	return 0;

}



static int pci_endpoint_test_doorbell(struct pci_endpoint_test *test)

{

	struct pci_dev *pdev = test->pdev;

	struct device *dev = &pdev->dev;

	int irq_type = test->irq_type;

	enum pci_barno bar;

	u32 data, status;

	u32 addr;

	int left;



	if (irq_type < PCITEST_IRQ_TYPE_INTX ||

	    irq_type > PCITEST_IRQ_TYPE_MSIX) {

		dev_err(dev, "Invalid IRQ type\n");

		return -EINVAL;

	}



	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_COMMAND,

				 COMMAND_ENABLE_DOORBELL);



	left = wait_for_completion_timeout(&test->irq_raised, msecs_to_jiffies(1000));



	status = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_STATUS);

	if (!left || (status & STATUS_DOORBELL_ENABLE_FAIL)) {

		dev_err(dev, "Failed to enable doorbell\n");

		return -EINVAL;

	}



	data = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_DB_DATA);

	addr = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_DB_OFFSET);

	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);



	bar = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_DB_BAR);



	writel(data, test->bar[bar] + addr);



	left = wait_for_completion_timeout(&test->irq_raised, msecs_to_jiffies(1000));



	status = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_STATUS);



	if (!left || !(status & STATUS_DOORBELL_SUCCESS))

		dev_err(dev, "Failed to trigger doorbell in endpoint\n");



	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND,

				 COMMAND_DISABLE_DOORBELL);



	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_DISABLE_FAIL) {

		dev_err(dev, "Failed to disable doorbell\n");

		return -EINVAL;

	}



	if (!(status & STATUS_DOORBELL_SUCCESS))

		return -EINVAL;



	return 0;

}



static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd,

				    unsigned long arg)

{
@@ -891,6 +971,9 @@ 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:

include/uapi/linux/pcitest.h

+1 −0
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ 
#define PCITEST_SET_IRQTYPE	_IOW('P', 0x8, int)

#define PCITEST_GET_IRQTYPE	_IO('P', 0x9)

#define PCITEST_BARS		_IO('P', 0xa)

#define PCITEST_DOORBELL	_IO('P', 0xb)

#define PCITEST_CLEAR_IRQ	_IO('P', 0x10)



#define PCITEST_IRQ_TYPE_UNDEFINED	-1