tools/testing/selftests/vfio/lib/vfio_pci_device.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/vfio/lib/vfio_pci_device.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/vfio/lib/vfio_pci_device.c
Extension
.c
Size
12802 bytes
Lines
483
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
#include <dirent.h>
#include <fcntl.h>
#include <libgen.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <sys/eventfd.h>
#include <sys/ioctl.h>
#include <sys/mman.h>

#include <linux/align.h>
#include <linux/iommufd.h>
#include <linux/kernel.h>
#include <linux/limits.h>
#include <linux/log2.h>
#include <linux/mman.h>
#include <linux/overflow.h>
#include <linux/sizes.h>
#include <linux/types.h>
#include <linux/vfio.h>

#include <uuid/uuid.h>

#include "kselftest.h"
#include <libvfio.h>

static void vfio_pci_irq_set(struct vfio_pci_device *device,
			     u32 index, u32 vector, u32 count, int *fds)
{
	u8 buf[sizeof(struct vfio_irq_set) + sizeof(int) * count];
	struct vfio_irq_set *irq = (void *)&buf;
	int *irq_fds = (void *)&irq->data;

	memset(buf, 0, sizeof(buf));

	irq->argsz = sizeof(buf);
	irq->flags = VFIO_IRQ_SET_ACTION_TRIGGER;
	irq->index = index;
	irq->start = vector;
	irq->count = count;

	if (count) {
		irq->flags |= VFIO_IRQ_SET_DATA_EVENTFD;
		memcpy(irq_fds, fds, sizeof(int) * count);
	} else {
		irq->flags |= VFIO_IRQ_SET_DATA_NONE;
	}

	ioctl_assert(device->fd, VFIO_DEVICE_SET_IRQS, irq);
}

void vfio_pci_irq_trigger(struct vfio_pci_device *device, u32 index, u32 vector)
{
	struct vfio_irq_set irq = {
		.argsz = sizeof(irq),
		.flags = VFIO_IRQ_SET_ACTION_TRIGGER | VFIO_IRQ_SET_DATA_NONE,
		.index = index,
		.start = vector,
		.count = 1,
	};

	ioctl_assert(device->fd, VFIO_DEVICE_SET_IRQS, &irq);
}

static void check_supported_irq_index(u32 index)
{
	/* VFIO selftests only supports MSI and MSI-x for now. */
	VFIO_ASSERT_TRUE(index == VFIO_PCI_MSI_IRQ_INDEX ||
			 index == VFIO_PCI_MSIX_IRQ_INDEX,
			 "Unsupported IRQ index: %u\n", index);
}

void vfio_pci_irq_enable(struct vfio_pci_device *device, u32 index, u32 vector,
			 int count)
{
	int i;

	check_supported_irq_index(index);

	for (i = vector; i < vector + count; i++) {
		VFIO_ASSERT_LT(device->msi_eventfds[i], 0);
		device->msi_eventfds[i] = eventfd(0, 0);
		VFIO_ASSERT_GE(device->msi_eventfds[i], 0);
	}

	vfio_pci_irq_set(device, index, vector, count, device->msi_eventfds + vector);
}

Annotation

Implementation Notes