tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/limits.h>
3#include <linux/sizes.h>
4#include <linux/vfio.h>
5#include <linux/iommufd.h>
6
7#include <stdint.h>
8#include <stdio.h>
9#include <sys/ioctl.h>
10#include <unistd.h>
11
12#include <libvfio.h>
13#include "kselftest_harness.h"
14
15static const char iommu_dev_path[] = "/dev/iommu";
16static const char *cdev_path;
17
18static int vfio_device_bind_iommufd_ioctl(int cdev_fd, int iommufd)
19{
20 struct vfio_device_bind_iommufd bind_args = {
21 .argsz = sizeof(bind_args),
22 .iommufd = iommufd,
23 };
24
25 return ioctl(cdev_fd, VFIO_DEVICE_BIND_IOMMUFD, &bind_args);
26}
27
28static int vfio_device_get_info_ioctl(int cdev_fd)
29{
30 struct vfio_device_info info_args = { .argsz = sizeof(info_args) };
31
32 return ioctl(cdev_fd, VFIO_DEVICE_GET_INFO, &info_args);
33}
34
35static int vfio_device_ioas_alloc_ioctl(int iommufd, struct iommu_ioas_alloc *alloc_args)
36{
37 *alloc_args = (struct iommu_ioas_alloc){
38 .size = sizeof(struct iommu_ioas_alloc),
39 };
40
41 return ioctl(iommufd, IOMMU_IOAS_ALLOC, alloc_args);
42}
43
44static int vfio_device_attach_iommufd_pt_ioctl(int cdev_fd, u32 pt_id)
45{
46 struct vfio_device_attach_iommufd_pt attach_args = {
47 .argsz = sizeof(attach_args),
48 .pt_id = pt_id,
49 };
50
51 return ioctl(cdev_fd, VFIO_DEVICE_ATTACH_IOMMUFD_PT, &attach_args);
52}
53
54static int vfio_device_detach_iommufd_pt_ioctl(int cdev_fd)
55{
56 struct vfio_device_detach_iommufd_pt detach_args = {
57 .argsz = sizeof(detach_args),
58 };
59
60 return ioctl(cdev_fd, VFIO_DEVICE_DETACH_IOMMUFD_PT, &detach_args);
61}
62
63FIXTURE(vfio_cdev) {
64 int cdev_fd;
65 int iommufd;
66};
67
68FIXTURE_SETUP(vfio_cdev)
69{
70 ASSERT_LE(0, (self->cdev_fd = open(cdev_path, O_RDWR, 0)));
71 ASSERT_LE(0, (self->iommufd = open(iommu_dev_path, O_RDWR, 0)));
72}
73
74FIXTURE_TEARDOWN(vfio_cdev)
75{
76 ASSERT_EQ(0, close(self->cdev_fd));
77 ASSERT_EQ(0, close(self->iommufd));
78}
79
80TEST_F(vfio_cdev, bind)
81{
82 ASSERT_EQ(0, vfio_device_bind_iommufd_ioctl(self->cdev_fd, self->iommufd));
83 ASSERT_EQ(0, vfio_device_get_info_ioctl(self->cdev_fd));
84}
85
86TEST_F(vfio_cdev, get_info_without_bind_fails)
87{
88 ASSERT_NE(0, vfio_device_get_info_ioctl(self->cdev_fd));
89}
90
91TEST_F(vfio_cdev, bind_bad_iommufd_fails)
92{
93 ASSERT_NE(0, vfio_device_bind_iommufd_ioctl(self->cdev_fd, -2));
94}
95
96TEST_F(vfio_cdev, repeated_bind_fails)
97{
98 ASSERT_EQ(0, vfio_device_bind_iommufd_ioctl(self->cdev_fd, self->iommufd));
99 ASSERT_NE(0, vfio_device_bind_iommufd_ioctl(self->cdev_fd, self->iommufd));
100}
101
102TEST_F(vfio_cdev, attach_detatch_pt)
103{
104 struct iommu_ioas_alloc alloc_args;
105
106 ASSERT_EQ(0, vfio_device_bind_iommufd_ioctl(self->cdev_fd, self->iommufd));
107 ASSERT_EQ(0, vfio_device_ioas_alloc_ioctl(self->iommufd, &alloc_args));
108 ASSERT_EQ(0, vfio_device_attach_iommufd_pt_ioctl(self->cdev_fd, alloc_args.out_ioas_id));
109 ASSERT_EQ(0, vfio_device_detach_iommufd_pt_ioctl(self->cdev_fd));
110}
111
112TEST_F(vfio_cdev, attach_invalid_pt_fails)
113{
114 ASSERT_EQ(0, vfio_device_bind_iommufd_ioctl(self->cdev_fd, self->iommufd));
115 ASSERT_NE(0, vfio_device_attach_iommufd_pt_ioctl(self->cdev_fd, UINT32_MAX));
116}
117
118int main(int argc, char *argv[])
119{
120 const char *device_bdf = vfio_selftests_get_bdf(&argc, argv);
121
122 cdev_path = vfio_pci_get_cdev_path(device_bdf);
123 printf("Using cdev device %s\n", cdev_path);
124
125 return test_harness_run(argc, argv);
126}