1 /*
2 * Copyright (C) 2013 Rob Clark <robclark@freedesktop.org>
3 * Copyright (C) 2014-2016 Emil Velikov <emil.l.velikov@gmail.com>
4 * Copyright (C) 2016 Intel Corporation
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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 *
25 * Authors:
26 * Rob Clark <robclark@freedesktop.org>
27 */
28
29 #include <errno.h>
30 #include <fcntl.h>
31 #include <sys/stat.h>
32 #include <stdarg.h>
33 #include <stdio.h>
34 #include <stdbool.h>
35 #include <string.h>
36 #include <unistd.h>
37 #include <stdlib.h>
38 #ifdef MAJOR_IN_MKDEV
39 #include <sys/mkdev.h>
40 #endif
41 #ifdef MAJOR_IN_SYSMACROS
42 #include <sys/sysmacros.h>
43 #endif
44 #include "loader.h"
45
46 #ifdef HAVE_LIBDRM
47 #include <xf86drm.h>
48 #ifdef USE_DRICONF
49 #include "util/xmlconfig.h"
50 #include "util/xmlpool.h"
51 #endif
52 #endif
53
54 #define __IS_LOADER
55 #include "pci_id_driver_map.h"
56
default_logger(int level,const char * fmt,...)57 static void default_logger(int level, const char *fmt, ...)
58 {
59 if (level <= _LOADER_WARNING) {
60 va_list args;
61 va_start(args, fmt);
62 vfprintf(stderr, fmt, args);
63 va_end(args);
64 }
65 }
66
67 static void (*log_)(int level, const char *fmt, ...) = default_logger;
68
69 int
loader_open_device(const char * device_name)70 loader_open_device(const char *device_name)
71 {
72 int fd;
73 #ifdef O_CLOEXEC
74 fd = open(device_name, O_RDWR | O_CLOEXEC);
75 if (fd == -1 && errno == EINVAL)
76 #endif
77 {
78 fd = open(device_name, O_RDWR);
79 if (fd != -1)
80 fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
81 }
82 return fd;
83 }
84
85 #if defined(HAVE_LIBDRM)
86 #ifdef USE_DRICONF
87 static const char __driConfigOptionsLoader[] =
88 DRI_CONF_BEGIN
89 DRI_CONF_SECTION_INITIALIZATION
90 DRI_CONF_DEVICE_ID_PATH_TAG()
91 DRI_CONF_SECTION_END
92 DRI_CONF_END;
93
loader_get_dri_config_device_id(void)94 static char *loader_get_dri_config_device_id(void)
95 {
96 driOptionCache defaultInitOptions;
97 driOptionCache userInitOptions;
98 char *prime = NULL;
99
100 driParseOptionInfo(&defaultInitOptions, __driConfigOptionsLoader);
101 driParseConfigFiles(&userInitOptions, &defaultInitOptions, 0, "loader");
102 if (driCheckOption(&userInitOptions, "device_id", DRI_STRING))
103 prime = strdup(driQueryOptionstr(&userInitOptions, "device_id"));
104 driDestroyOptionCache(&userInitOptions);
105 driDestroyOptionInfo(&defaultInitOptions);
106
107 return prime;
108 }
109 #endif
110
drm_construct_id_path_tag(drmDevicePtr device)111 static char *drm_construct_id_path_tag(drmDevicePtr device)
112 {
113 /* Length of "pci-xxxx_xx_xx_x\0" */
114 #define PCI_ID_PATH_TAG_LENGTH 17
115 char *tag = NULL;
116
117 if (device->bustype == DRM_BUS_PCI) {
118 tag = calloc(PCI_ID_PATH_TAG_LENGTH, sizeof(char));
119 if (tag == NULL)
120 return NULL;
121
122 snprintf(tag, PCI_ID_PATH_TAG_LENGTH, "pci-%04x_%02x_%02x_%1u",
123 device->businfo.pci->domain, device->businfo.pci->bus,
124 device->businfo.pci->dev, device->businfo.pci->func);
125 }
126 return tag;
127 }
128
drm_device_matches_tag(drmDevicePtr device,const char * prime_tag)129 static bool drm_device_matches_tag(drmDevicePtr device, const char *prime_tag)
130 {
131 char *tag = drm_construct_id_path_tag(device);
132 int ret;
133
134 if (tag == NULL)
135 return false;
136
137 ret = strcmp(tag, prime_tag);
138
139 free(tag);
140 return ret == 0;
141 }
142
drm_get_id_path_tag_for_fd(int fd)143 static char *drm_get_id_path_tag_for_fd(int fd)
144 {
145 drmDevicePtr device;
146 char *tag;
147
148 if (drmGetDevice2(fd, 0, &device) != 0)
149 return NULL;
150
151 tag = drm_construct_id_path_tag(device);
152 drmFreeDevice(&device);
153 return tag;
154 }
155
loader_get_user_preferred_fd(int default_fd,bool * different_device)156 int loader_get_user_preferred_fd(int default_fd, bool *different_device)
157 {
158 /* Arbitrary "maximum" value of drm devices. */
159 #define MAX_DRM_DEVICES 32
160 const char *dri_prime = getenv("DRI_PRIME");
161 char *default_tag, *prime = NULL;
162 drmDevicePtr devices[MAX_DRM_DEVICES];
163 int i, num_devices, fd;
164 bool found = false;
165
166 if (dri_prime)
167 prime = strdup(dri_prime);
168 #ifdef USE_DRICONF
169 else
170 prime = loader_get_dri_config_device_id();
171 #endif
172
173 if (prime == NULL) {
174 *different_device = false;
175 return default_fd;
176 }
177
178 default_tag = drm_get_id_path_tag_for_fd(default_fd);
179 if (default_tag == NULL)
180 goto err;
181
182 num_devices = drmGetDevices2(0, devices, MAX_DRM_DEVICES);
183 if (num_devices < 0)
184 goto err;
185
186 /* two format are supported:
187 * "1": choose any other card than the card used by default.
188 * id_path_tag: (for example "pci-0000_02_00_0") choose the card
189 * with this id_path_tag.
190 */
191 if (!strcmp(prime,"1")) {
192 /* Hmm... detection for 2-7 seems to be broken. Oh well ...
193 * Pick the first render device that is not our own.
194 */
195 for (i = 0; i < num_devices; i++) {
196 if (devices[i]->available_nodes & 1 << DRM_NODE_RENDER &&
197 !drm_device_matches_tag(devices[i], default_tag)) {
198
199 found = true;
200 break;
201 }
202 }
203 } else {
204 for (i = 0; i < num_devices; i++) {
205 if (devices[i]->available_nodes & 1 << DRM_NODE_RENDER &&
206 drm_device_matches_tag(devices[i], prime)) {
207
208 found = true;
209 break;
210 }
211 }
212 }
213
214 if (!found) {
215 drmFreeDevices(devices, num_devices);
216 goto err;
217 }
218
219 fd = loader_open_device(devices[i]->nodes[DRM_NODE_RENDER]);
220 drmFreeDevices(devices, num_devices);
221 if (fd < 0)
222 goto err;
223
224 close(default_fd);
225
226 *different_device = !!strcmp(default_tag, prime);
227
228 free(default_tag);
229 free(prime);
230 return fd;
231
232 err:
233 *different_device = false;
234
235 free(default_tag);
236 free(prime);
237 return default_fd;
238 }
239 #else
loader_get_user_preferred_fd(int default_fd,bool * different_device)240 int loader_get_user_preferred_fd(int default_fd, bool *different_device)
241 {
242 *different_device = false;
243 return default_fd;
244 }
245 #endif
246
247 #if defined(HAVE_LIBDRM)
248
249 static int
drm_get_pci_id_for_fd(int fd,int * vendor_id,int * chip_id)250 drm_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
251 {
252 drmDevicePtr device;
253 int ret;
254
255 if (drmGetDevice2(fd, 0, &device) == 0) {
256 if (device->bustype == DRM_BUS_PCI) {
257 *vendor_id = device->deviceinfo.pci->vendor_id;
258 *chip_id = device->deviceinfo.pci->device_id;
259 ret = 1;
260 }
261 else {
262 log_(_LOADER_DEBUG, "MESA-LOADER: device is not located on the PCI bus\n");
263 ret = 0;
264 }
265 drmFreeDevice(&device);
266 }
267 else {
268 log_(_LOADER_WARNING, "MESA-LOADER: failed to retrieve device information\n");
269 ret = 0;
270 }
271
272 return ret;
273 }
274 #endif
275
276
277 int
loader_get_pci_id_for_fd(int fd,int * vendor_id,int * chip_id)278 loader_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
279 {
280 #if HAVE_LIBDRM
281 if (drm_get_pci_id_for_fd(fd, vendor_id, chip_id))
282 return 1;
283 #endif
284 return 0;
285 }
286
287 char *
loader_get_device_name_for_fd(int fd)288 loader_get_device_name_for_fd(int fd)
289 {
290 char *result = NULL;
291
292 #if HAVE_LIBDRM
293 result = drmGetDeviceNameFromFd2(fd);
294 #endif
295
296 return result;
297 }
298
299 char *
loader_get_driver_for_fd(int fd)300 loader_get_driver_for_fd(int fd)
301 {
302 int vendor_id, chip_id, i, j;
303 char *driver = NULL;
304
305 /* Allow an environment variable to force choosing a different driver
306 * binary. If that driver binary can't survive on this FD, that's the
307 * user's problem, but this allows vc4 simulator to run on an i965 host,
308 * and may be useful for some touch testing of i915 on an i965 host.
309 */
310 if (geteuid() == getuid()) {
311 driver = getenv("MESA_LOADER_DRIVER_OVERRIDE");
312 if (driver)
313 return strdup(driver);
314 }
315
316 if (!loader_get_pci_id_for_fd(fd, &vendor_id, &chip_id)) {
317
318 #if HAVE_LIBDRM
319 /* fallback to drmGetVersion(): */
320 drmVersionPtr version = drmGetVersion(fd);
321
322 if (!version) {
323 log_(_LOADER_WARNING, "failed to get driver name for fd %d\n", fd);
324 return NULL;
325 }
326
327 driver = strndup(version->name, version->name_len);
328 log_(_LOADER_INFO, "using driver %s for %d\n", driver, fd);
329
330 drmFreeVersion(version);
331 #endif
332
333 return driver;
334 }
335
336 for (i = 0; driver_map[i].driver; i++) {
337 if (vendor_id != driver_map[i].vendor_id)
338 continue;
339
340 if (driver_map[i].predicate && !driver_map[i].predicate(fd))
341 continue;
342
343 if (driver_map[i].num_chips_ids == -1) {
344 driver = strdup(driver_map[i].driver);
345 goto out;
346 }
347
348 for (j = 0; j < driver_map[i].num_chips_ids; j++)
349 if (driver_map[i].chip_ids[j] == chip_id) {
350 driver = strdup(driver_map[i].driver);
351 goto out;
352 }
353 }
354
355 out:
356 log_(driver ? _LOADER_DEBUG : _LOADER_WARNING,
357 "pci id for fd %d: %04x:%04x, driver %s\n",
358 fd, vendor_id, chip_id, driver);
359 return driver;
360 }
361
362 void
loader_set_logger(void (* logger)(int level,const char * fmt,...))363 loader_set_logger(void (*logger)(int level, const char *fmt, ...))
364 {
365 log_ = logger;
366 }
367
368 /* XXX: Local definition to avoid pulling the heavyweight GL/gl.h and
369 * GL/internal/dri_interface.h
370 */
371
372 #ifndef __DRI_DRIVER_GET_EXTENSIONS
373 #define __DRI_DRIVER_GET_EXTENSIONS "__driDriverGetExtensions"
374 #endif
375
376 char *
loader_get_extensions_name(const char * driver_name)377 loader_get_extensions_name(const char *driver_name)
378 {
379 char *name = NULL;
380
381 if (asprintf(&name, "%s_%s", __DRI_DRIVER_GET_EXTENSIONS, driver_name) < 0)
382 return NULL;
383
384 const size_t len = strlen(name);
385 for (size_t i = 0; i < len; i++) {
386 if (name[i] == '-')
387 name[i] = '_';
388 }
389
390 return name;
391 }
392