1 // SPDX-License-Identifier: GPL-2.0-only
2
3 #include <stdio.h>
4 #include <stdlib.h>
5
6 #include "../../../kselftest.h"
7 #include <libvfio.h>
8
is_bdf(const char * str)9 static bool is_bdf(const char *str)
10 {
11 unsigned int s, b, d, f;
12 int length, count;
13
14 count = sscanf(str, "%4x:%2x:%2x.%2x%n", &s, &b, &d, &f, &length);
15 return count == 4 && length == strlen(str);
16 }
17
get_bdfs_cmdline(int * argc,char * argv[],int * nr_bdfs)18 static char **get_bdfs_cmdline(int *argc, char *argv[], int *nr_bdfs)
19 {
20 int i;
21
22 for (i = *argc - 1; i > 0 && is_bdf(argv[i]); i--)
23 continue;
24
25 i++;
26 *nr_bdfs = *argc - i;
27 *argc -= *nr_bdfs;
28
29 return *nr_bdfs ? &argv[i] : NULL;
30 }
31
get_bdf_env(void)32 static char *get_bdf_env(void)
33 {
34 char *bdf;
35
36 bdf = getenv("VFIO_SELFTESTS_BDF");
37 if (!bdf)
38 return NULL;
39
40 VFIO_ASSERT_TRUE(is_bdf(bdf), "Invalid BDF: %s\n", bdf);
41 return bdf;
42 }
43
vfio_selftests_get_bdfs(int * argc,char * argv[],int * nr_bdfs)44 char **vfio_selftests_get_bdfs(int *argc, char *argv[], int *nr_bdfs)
45 {
46 static char *env_bdf;
47 char **bdfs;
48
49 bdfs = get_bdfs_cmdline(argc, argv, nr_bdfs);
50 if (bdfs)
51 return bdfs;
52
53 env_bdf = get_bdf_env();
54 if (env_bdf) {
55 *nr_bdfs = 1;
56 return &env_bdf;
57 }
58
59 fprintf(stderr, "Unable to determine which device(s) to use, skipping test.\n");
60 fprintf(stderr, "\n");
61 fprintf(stderr, "To pass the device address via environment variable:\n");
62 fprintf(stderr, "\n");
63 fprintf(stderr, " export VFIO_SELFTESTS_BDF=\"segment:bus:device.function\"\n");
64 fprintf(stderr, " %s [options]\n", argv[0]);
65 fprintf(stderr, "\n");
66 fprintf(stderr, "To pass the device address(es) via argv:\n");
67 fprintf(stderr, "\n");
68 fprintf(stderr, " %s [options] segment:bus:device.function ...\n", argv[0]);
69 fprintf(stderr, "\n");
70 exit(KSFT_SKIP);
71 }
72
vfio_selftests_get_bdf(int * argc,char * argv[])73 const char *vfio_selftests_get_bdf(int *argc, char *argv[])
74 {
75 int nr_bdfs;
76
77 return vfio_selftests_get_bdfs(argc, argv, &nr_bdfs)[0];
78 }
79