1 /*
2 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
3 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
15 * Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
23 * DEALINGS IN THE SOFTWARE.
24 */
25
26 #pragma once
27
28 #include_next <xf86drm.h>
29
30 #include <string.h>
31 #include <errno.h>
32
33 /*
34 * FIXME: Below code comes from https://patchwork.kernel.org/patch/10368203/
35 * FIXME: Remove or rework once that has been merged
36 */
37
38 typedef enum drm_match_key {
39 /* Match against DRM_NODE_{PRIMARY,RENDER,...} type */
40 DRM_MATCH_NODE_TYPE = 1,
41 DRM_MATCH_DRIVER_NAME = 2,
42 DRM_MATCH_BUS_PCI_VENDOR = 3,
43 DRM_MATCH_FUNCTION = 4,
44 } drm_match_key_t;
45
46 typedef struct drm_match_func {
47 void *data;
48 int (*fp)(int, void*); /* Intended arguments are fp(fd, data) */
49 } drm_match_func_t;
50
51 typedef struct drm_match {
52 drm_match_key_t type;
53 union {
54 int s;
55 uint16_t u16;
56 char *str;
57 drm_match_func_t func;
58 };
59 } drm_match_t;
60
drmHandleMatch(int fd,drm_match_t * filters,int nbr_filters)61 static inline int drmHandleMatch(int fd, drm_match_t *filters, int nbr_filters)
62 {
63 if (fd < 0)
64 goto error;
65
66 if (nbr_filters > 0 && filters == NULL)
67 goto error;
68
69 drmVersionPtr ver = drmGetVersion(fd);
70 if (!ver)
71 goto fail;
72
73 drmDevicePtr dev = NULL;
74 if (drmGetDevice2(fd, 0, &dev) != 0) {
75 goto fail;
76 }
77
78 for (int i = 0; i < nbr_filters; i++) {
79 drm_match_t *f = &filters[i];
80 switch (f->type) {
81 case DRM_MATCH_NODE_TYPE:
82 if (!(dev->available_nodes & (1 << f->s)))
83 goto fail;
84 break;
85 case DRM_MATCH_DRIVER_NAME:
86 if (!f->str)
87 goto error;
88
89 /* This bypass is used by when the driver name is used
90 by the Android property_get() func, when it hasn't found
91 the property and the string is empty as a result. */
92 if (strlen(f->str) == 0)
93 continue;
94
95 if (strncmp(ver->name, f->str, strlen(ver->name)))
96 goto fail;
97 break;
98 case DRM_MATCH_BUS_PCI_VENDOR:
99 if (dev->bustype != DRM_BUS_PCI)
100 goto fail;
101 if (dev->deviceinfo.pci->vendor_id != f->u16)
102 goto fail;
103 break;
104 case DRM_MATCH_FUNCTION:
105 if (!f->func.fp)
106 goto error;
107 int (*fp)(int, void*) = f->func.fp;
108 void *data = f->func.data;
109 if (!fp(fd, data))
110 goto fail;
111 break;
112 default:
113 goto error;
114 }
115 }
116
117 success:
118 drmFreeVersion(ver);
119 drmFreeDevice(&dev);
120 return 0;
121 error:
122 drmFreeVersion(ver);
123 drmFreeDevice(&dev);
124 return -EINVAL;
125 fail:
126 drmFreeVersion(ver);
127 drmFreeDevice(&dev);
128 return 1;
129 }
130
131