loader: simplify loader_get_user_preferred_fd()
[mesa.git] / src / loader / pci_id_driver_map.c
1 /*
2 * Copyright 2014 Ilia Mirkin
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 */
23
24 #include <stdbool.h>
25
26 bool is_nouveau_vieux(int fd);
27
28 #ifdef HAVE_LIBDRM
29
30 #include <stdlib.h>
31 #include <xf86drm.h>
32 #include <nouveau_drm.h>
33
34 static int
35 nouveau_chipset(int fd)
36 {
37 struct drm_nouveau_getparam gp = { NOUVEAU_GETPARAM_CHIPSET_ID, 0 };
38 int ret;
39
40 ret = drmCommandWriteRead(fd, DRM_NOUVEAU_GETPARAM, &gp, sizeof(gp));
41 if (ret)
42 return -1;
43
44 return gp.value;
45 }
46
47 bool
48 is_nouveau_vieux(int fd)
49 {
50 int chipset = nouveau_chipset(fd);
51 return (chipset > 0 && chipset < 0x30) ||
52 (chipset < 0x40 && getenv("NOUVEAU_VIEUX") != NULL);
53 }
54
55 #else
56
57 bool is_nouveau_vieux(int fd) { return false; }
58
59 #endif