Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /** |
b5e89ed5 | 2 | * \file drm_context.c |
1da177e4 | 3 | * IOCTLs for generic contexts |
b5e89ed5 | 4 | * |
1da177e4 LT |
5 | * \author Rickard E. (Rik) Faith <faith@valinux.com> |
6 | * \author Gareth Hughes <gareth@valinux.com> | |
7 | */ | |
8 | ||
9 | /* | |
10 | * Created: Fri Nov 24 18:31:37 2000 by gareth@valinux.com | |
11 | * | |
12 | * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. | |
13 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
14 | * All Rights Reserved. | |
15 | * | |
16 | * Permission is hereby granted, free of charge, to any person obtaining a | |
17 | * copy of this software and associated documentation files (the "Software"), | |
18 | * to deal in the Software without restriction, including without limitation | |
19 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
20 | * and/or sell copies of the Software, and to permit persons to whom the | |
21 | * Software is furnished to do so, subject to the following conditions: | |
22 | * | |
23 | * The above copyright notice and this permission notice (including the next | |
24 | * paragraph) shall be included in all copies or substantial portions of the | |
25 | * Software. | |
26 | * | |
27 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
28 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
29 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
30 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
31 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
32 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
33 | * OTHER DEALINGS IN THE SOFTWARE. | |
34 | */ | |
35 | ||
36 | /* | |
37 | * ChangeLog: | |
38 | * 2001-11-16 Torsten Duwe <duwe@caldera.de> | |
39 | * added context constructor/destructor hooks, | |
40 | * needed by SiS driver's memory management. | |
41 | */ | |
42 | ||
760285e7 | 43 | #include <drm/drmP.h> |
1da177e4 LT |
44 | |
45 | /******************************************************************/ | |
46 | /** \name Context bitmap support */ | |
47 | /*@{*/ | |
48 | ||
49 | /** | |
50 | * Free a handle from the context bitmap. | |
51 | * | |
52 | * \param dev DRM device. | |
53 | * \param ctx_handle context handle. | |
54 | * | |
55 | * Clears the bit specified by \p ctx_handle in drm_device::ctx_bitmap and the entry | |
62968144 | 56 | * in drm_device::ctx_idr, while holding the drm_device::struct_mutex |
1da177e4 LT |
57 | * lock. |
58 | */ | |
84b1fd10 | 59 | void drm_ctxbitmap_free(struct drm_device * dev, int ctx_handle) |
1da177e4 | 60 | { |
62968144 DA |
61 | mutex_lock(&dev->struct_mutex); |
62 | idr_remove(&dev->ctx_idr, ctx_handle); | |
63 | mutex_unlock(&dev->struct_mutex); | |
1da177e4 LT |
64 | } |
65 | ||
b5e89ed5 | 66 | /** |
1da177e4 LT |
67 | * Context bitmap allocation. |
68 | * | |
69 | * \param dev DRM device. | |
70 | * \return (non-negative) context handle on success or a negative number on failure. | |
71 | * | |
62968144 | 72 | * Allocate a new idr from drm_device::ctx_idr while holding the |
30e2fb18 | 73 | * drm_device::struct_mutex lock. |
1da177e4 | 74 | */ |
84b1fd10 | 75 | static int drm_ctxbitmap_next(struct drm_device * dev) |
1da177e4 | 76 | { |
62968144 | 77 | int ret; |
1da177e4 | 78 | |
30e2fb18 | 79 | mutex_lock(&dev->struct_mutex); |
2e928815 TH |
80 | ret = idr_alloc(&dev->ctx_idr, NULL, DRM_RESERVED_CONTEXTS, 0, |
81 | GFP_KERNEL); | |
30e2fb18 | 82 | mutex_unlock(&dev->struct_mutex); |
2e928815 | 83 | return ret; |
1da177e4 LT |
84 | } |
85 | ||
86 | /** | |
87 | * Context bitmap initialization. | |
88 | * | |
89 | * \param dev DRM device. | |
90 | * | |
62968144 | 91 | * Initialise the drm_device::ctx_idr |
1da177e4 | 92 | */ |
84b1fd10 | 93 | int drm_ctxbitmap_init(struct drm_device * dev) |
1da177e4 | 94 | { |
62968144 | 95 | idr_init(&dev->ctx_idr); |
1da177e4 LT |
96 | return 0; |
97 | } | |
98 | ||
99 | /** | |
100 | * Context bitmap cleanup. | |
101 | * | |
102 | * \param dev DRM device. | |
103 | * | |
62968144 DA |
104 | * Free all idr members using drm_ctx_sarea_free helper function |
105 | * while holding the drm_device::struct_mutex lock. | |
1da177e4 | 106 | */ |
84b1fd10 | 107 | void drm_ctxbitmap_cleanup(struct drm_device * dev) |
1da177e4 | 108 | { |
30e2fb18 | 109 | mutex_lock(&dev->struct_mutex); |
4d53233a | 110 | idr_destroy(&dev->ctx_idr); |
30e2fb18 | 111 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
112 | } |
113 | ||
114 | /*@}*/ | |
115 | ||
116 | /******************************************************************/ | |
117 | /** \name Per Context SAREA Support */ | |
118 | /*@{*/ | |
119 | ||
120 | /** | |
121 | * Get per-context SAREA. | |
b5e89ed5 | 122 | * |
1da177e4 | 123 | * \param inode device inode. |
6c340eac | 124 | * \param file_priv DRM file private. |
1da177e4 LT |
125 | * \param cmd command. |
126 | * \param arg user argument pointing to a drm_ctx_priv_map structure. | |
127 | * \return zero on success or a negative number on failure. | |
128 | * | |
62968144 | 129 | * Gets the map from drm_device::ctx_idr with the handle specified and |
1da177e4 LT |
130 | * returns its handle. |
131 | */ | |
c153f45f EA |
132 | int drm_getsareactx(struct drm_device *dev, void *data, |
133 | struct drm_file *file_priv) | |
1da177e4 | 134 | { |
c153f45f | 135 | struct drm_ctx_priv_map *request = data; |
f77d390c | 136 | struct drm_local_map *map; |
55910517 | 137 | struct drm_map_list *_entry; |
1da177e4 | 138 | |
30e2fb18 | 139 | mutex_lock(&dev->struct_mutex); |
62968144 | 140 | |
c153f45f | 141 | map = idr_find(&dev->ctx_idr, request->ctx_id); |
62968144 | 142 | if (!map) { |
30e2fb18 | 143 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
144 | return -EINVAL; |
145 | } | |
146 | ||
c153f45f | 147 | request->handle = NULL; |
bd1b331f | 148 | list_for_each_entry(_entry, &dev->maplist, head) { |
d1f2b55a | 149 | if (_entry->map == map) { |
bc5f4523 | 150 | request->handle = |
b5e89ed5 | 151 | (void *)(unsigned long)_entry->user_token; |
d1f2b55a DA |
152 | break; |
153 | } | |
154 | } | |
09b4ea47 IH |
155 | |
156 | mutex_unlock(&dev->struct_mutex); | |
157 | ||
c153f45f | 158 | if (request->handle == NULL) |
d1f2b55a DA |
159 | return -EINVAL; |
160 | ||
1da177e4 LT |
161 | return 0; |
162 | } | |
163 | ||
164 | /** | |
165 | * Set per-context SAREA. | |
b5e89ed5 | 166 | * |
1da177e4 | 167 | * \param inode device inode. |
6c340eac | 168 | * \param file_priv DRM file private. |
1da177e4 LT |
169 | * \param cmd command. |
170 | * \param arg user argument pointing to a drm_ctx_priv_map structure. | |
171 | * \return zero on success or a negative number on failure. | |
172 | * | |
173 | * Searches the mapping specified in \p arg and update the entry in | |
62968144 | 174 | * drm_device::ctx_idr with it. |
1da177e4 | 175 | */ |
c153f45f EA |
176 | int drm_setsareactx(struct drm_device *dev, void *data, |
177 | struct drm_file *file_priv) | |
1da177e4 | 178 | { |
c153f45f | 179 | struct drm_ctx_priv_map *request = data; |
f77d390c | 180 | struct drm_local_map *map = NULL; |
55910517 | 181 | struct drm_map_list *r_list = NULL; |
1da177e4 | 182 | |
30e2fb18 | 183 | mutex_lock(&dev->struct_mutex); |
bd1b331f | 184 | list_for_each_entry(r_list, &dev->maplist, head) { |
9a186645 | 185 | if (r_list->map |
c153f45f | 186 | && r_list->user_token == (unsigned long) request->handle) |
1da177e4 LT |
187 | goto found; |
188 | } | |
b5e89ed5 | 189 | bad: |
30e2fb18 | 190 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
191 | return -EINVAL; |
192 | ||
b5e89ed5 | 193 | found: |
1da177e4 | 194 | map = r_list->map; |
b5e89ed5 DA |
195 | if (!map) |
196 | goto bad; | |
62968144 | 197 | |
c153f45f | 198 | if (IS_ERR(idr_replace(&dev->ctx_idr, map, request->ctx_id))) |
1da177e4 | 199 | goto bad; |
62968144 | 200 | |
30e2fb18 | 201 | mutex_unlock(&dev->struct_mutex); |
c153f45f | 202 | |
1da177e4 LT |
203 | return 0; |
204 | } | |
205 | ||
206 | /*@}*/ | |
207 | ||
208 | /******************************************************************/ | |
209 | /** \name The actual DRM context handling routines */ | |
210 | /*@{*/ | |
211 | ||
212 | /** | |
213 | * Switch context. | |
214 | * | |
215 | * \param dev DRM device. | |
216 | * \param old old context handle. | |
217 | * \param new new context handle. | |
218 | * \return zero on success or a negative number on failure. | |
219 | * | |
220 | * Attempt to set drm_device::context_flag. | |
221 | */ | |
84b1fd10 | 222 | static int drm_context_switch(struct drm_device * dev, int old, int new) |
1da177e4 | 223 | { |
b5e89ed5 DA |
224 | if (test_and_set_bit(0, &dev->context_flag)) { |
225 | DRM_ERROR("Reentering -- FIXME\n"); | |
226 | return -EBUSY; | |
227 | } | |
1da177e4 | 228 | |
b5e89ed5 | 229 | DRM_DEBUG("Context switch from %d to %d\n", old, new); |
1da177e4 | 230 | |
b5e89ed5 DA |
231 | if (new == dev->last_context) { |
232 | clear_bit(0, &dev->context_flag); | |
233 | return 0; | |
234 | } | |
1da177e4 | 235 | |
b5e89ed5 | 236 | return 0; |
1da177e4 LT |
237 | } |
238 | ||
239 | /** | |
240 | * Complete context switch. | |
241 | * | |
242 | * \param dev DRM device. | |
243 | * \param new new context handle. | |
244 | * \return zero on success or a negative number on failure. | |
245 | * | |
246 | * Updates drm_device::last_context and drm_device::last_switch. Verifies the | |
247 | * hardware lock is held, clears the drm_device::context_flag and wakes up | |
248 | * drm_device::context_wait. | |
249 | */ | |
7c1c2871 DA |
250 | static int drm_context_switch_complete(struct drm_device *dev, |
251 | struct drm_file *file_priv, int new) | |
1da177e4 | 252 | { |
b5e89ed5 DA |
253 | dev->last_context = new; /* PRE/POST: This is the _only_ writer. */ |
254 | dev->last_switch = jiffies; | |
1da177e4 | 255 | |
7c1c2871 | 256 | if (!_DRM_LOCK_IS_HELD(file_priv->master->lock.hw_lock->lock)) { |
b5e89ed5 DA |
257 | DRM_ERROR("Lock isn't held after context switch\n"); |
258 | } | |
1da177e4 | 259 | |
b5e89ed5 DA |
260 | /* If a context switch is ever initiated |
261 | when the kernel holds the lock, release | |
262 | that lock here. */ | |
263 | clear_bit(0, &dev->context_flag); | |
264 | wake_up(&dev->context_wait); | |
1da177e4 | 265 | |
b5e89ed5 | 266 | return 0; |
1da177e4 LT |
267 | } |
268 | ||
269 | /** | |
270 | * Reserve contexts. | |
271 | * | |
272 | * \param inode device inode. | |
6c340eac | 273 | * \param file_priv DRM file private. |
1da177e4 LT |
274 | * \param cmd command. |
275 | * \param arg user argument pointing to a drm_ctx_res structure. | |
276 | * \return zero on success or a negative number on failure. | |
277 | */ | |
c153f45f EA |
278 | int drm_resctx(struct drm_device *dev, void *data, |
279 | struct drm_file *file_priv) | |
1da177e4 | 280 | { |
c153f45f | 281 | struct drm_ctx_res *res = data; |
c60ce623 | 282 | struct drm_ctx ctx; |
1da177e4 LT |
283 | int i; |
284 | ||
c153f45f | 285 | if (res->count >= DRM_RESERVED_CONTEXTS) { |
b5e89ed5 DA |
286 | memset(&ctx, 0, sizeof(ctx)); |
287 | for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) { | |
1da177e4 | 288 | ctx.handle = i; |
c153f45f | 289 | if (copy_to_user(&res->contexts[i], &ctx, sizeof(ctx))) |
1da177e4 LT |
290 | return -EFAULT; |
291 | } | |
292 | } | |
c153f45f | 293 | res->count = DRM_RESERVED_CONTEXTS; |
1da177e4 | 294 | |
1da177e4 LT |
295 | return 0; |
296 | } | |
297 | ||
298 | /** | |
299 | * Add context. | |
300 | * | |
301 | * \param inode device inode. | |
6c340eac | 302 | * \param file_priv DRM file private. |
1da177e4 LT |
303 | * \param cmd command. |
304 | * \param arg user argument pointing to a drm_ctx structure. | |
305 | * \return zero on success or a negative number on failure. | |
306 | * | |
307 | * Get a new handle for the context and copy to userspace. | |
308 | */ | |
c153f45f EA |
309 | int drm_addctx(struct drm_device *dev, void *data, |
310 | struct drm_file *file_priv) | |
1da177e4 | 311 | { |
55910517 | 312 | struct drm_ctx_list *ctx_entry; |
c153f45f | 313 | struct drm_ctx *ctx = data; |
1da177e4 | 314 | |
c153f45f EA |
315 | ctx->handle = drm_ctxbitmap_next(dev); |
316 | if (ctx->handle == DRM_KERNEL_CONTEXT) { | |
b5e89ed5 | 317 | /* Skip kernel's context and get a new one. */ |
c153f45f | 318 | ctx->handle = drm_ctxbitmap_next(dev); |
1da177e4 | 319 | } |
c153f45f EA |
320 | DRM_DEBUG("%d\n", ctx->handle); |
321 | if (ctx->handle == -1) { | |
b5e89ed5 DA |
322 | DRM_DEBUG("Not enough free contexts.\n"); |
323 | /* Should this return -EBUSY instead? */ | |
1da177e4 LT |
324 | return -ENOMEM; |
325 | } | |
326 | ||
9a298b2a | 327 | ctx_entry = kmalloc(sizeof(*ctx_entry), GFP_KERNEL); |
b5e89ed5 | 328 | if (!ctx_entry) { |
1da177e4 LT |
329 | DRM_DEBUG("out of memory\n"); |
330 | return -ENOMEM; | |
331 | } | |
332 | ||
b5e89ed5 | 333 | INIT_LIST_HEAD(&ctx_entry->head); |
c153f45f | 334 | ctx_entry->handle = ctx->handle; |
6c340eac | 335 | ctx_entry->tag = file_priv; |
1da177e4 | 336 | |
30e2fb18 | 337 | mutex_lock(&dev->ctxlist_mutex); |
bd1b331f | 338 | list_add(&ctx_entry->head, &dev->ctxlist); |
1da177e4 | 339 | ++dev->ctx_count; |
30e2fb18 | 340 | mutex_unlock(&dev->ctxlist_mutex); |
1da177e4 | 341 | |
1da177e4 LT |
342 | return 0; |
343 | } | |
344 | ||
c153f45f | 345 | int drm_modctx(struct drm_device *dev, void *data, struct drm_file *file_priv) |
1da177e4 LT |
346 | { |
347 | /* This does nothing */ | |
348 | return 0; | |
349 | } | |
350 | ||
351 | /** | |
352 | * Get context. | |
353 | * | |
354 | * \param inode device inode. | |
6c340eac | 355 | * \param file_priv DRM file private. |
1da177e4 LT |
356 | * \param cmd command. |
357 | * \param arg user argument pointing to a drm_ctx structure. | |
358 | * \return zero on success or a negative number on failure. | |
359 | */ | |
c153f45f | 360 | int drm_getctx(struct drm_device *dev, void *data, struct drm_file *file_priv) |
1da177e4 | 361 | { |
c153f45f | 362 | struct drm_ctx *ctx = data; |
1da177e4 LT |
363 | |
364 | /* This is 0, because we don't handle any context flags */ | |
c153f45f | 365 | ctx->flags = 0; |
1da177e4 | 366 | |
1da177e4 LT |
367 | return 0; |
368 | } | |
369 | ||
370 | /** | |
371 | * Switch context. | |
372 | * | |
373 | * \param inode device inode. | |
6c340eac | 374 | * \param file_priv DRM file private. |
1da177e4 LT |
375 | * \param cmd command. |
376 | * \param arg user argument pointing to a drm_ctx structure. | |
377 | * \return zero on success or a negative number on failure. | |
378 | * | |
379 | * Calls context_switch(). | |
380 | */ | |
c153f45f EA |
381 | int drm_switchctx(struct drm_device *dev, void *data, |
382 | struct drm_file *file_priv) | |
1da177e4 | 383 | { |
c153f45f | 384 | struct drm_ctx *ctx = data; |
1da177e4 | 385 | |
c153f45f EA |
386 | DRM_DEBUG("%d\n", ctx->handle); |
387 | return drm_context_switch(dev, dev->last_context, ctx->handle); | |
1da177e4 LT |
388 | } |
389 | ||
390 | /** | |
391 | * New context. | |
392 | * | |
393 | * \param inode device inode. | |
6c340eac | 394 | * \param file_priv DRM file private. |
1da177e4 LT |
395 | * \param cmd command. |
396 | * \param arg user argument pointing to a drm_ctx structure. | |
397 | * \return zero on success or a negative number on failure. | |
398 | * | |
399 | * Calls context_switch_complete(). | |
400 | */ | |
c153f45f EA |
401 | int drm_newctx(struct drm_device *dev, void *data, |
402 | struct drm_file *file_priv) | |
1da177e4 | 403 | { |
c153f45f | 404 | struct drm_ctx *ctx = data; |
1da177e4 | 405 | |
c153f45f | 406 | DRM_DEBUG("%d\n", ctx->handle); |
7c1c2871 | 407 | drm_context_switch_complete(dev, file_priv, ctx->handle); |
1da177e4 LT |
408 | |
409 | return 0; | |
410 | } | |
411 | ||
412 | /** | |
413 | * Remove context. | |
414 | * | |
415 | * \param inode device inode. | |
6c340eac | 416 | * \param file_priv DRM file private. |
1da177e4 LT |
417 | * \param cmd command. |
418 | * \param arg user argument pointing to a drm_ctx structure. | |
419 | * \return zero on success or a negative number on failure. | |
420 | * | |
421 | * If not the special kernel context, calls ctxbitmap_free() to free the specified context. | |
422 | */ | |
c153f45f EA |
423 | int drm_rmctx(struct drm_device *dev, void *data, |
424 | struct drm_file *file_priv) | |
1da177e4 | 425 | { |
c153f45f | 426 | struct drm_ctx *ctx = data; |
1da177e4 | 427 | |
c153f45f | 428 | DRM_DEBUG("%d\n", ctx->handle); |
c153f45f | 429 | if (ctx->handle != DRM_KERNEL_CONTEXT) { |
1da177e4 | 430 | if (dev->driver->context_dtor) |
c153f45f EA |
431 | dev->driver->context_dtor(dev, ctx->handle); |
432 | drm_ctxbitmap_free(dev, ctx->handle); | |
1da177e4 LT |
433 | } |
434 | ||
30e2fb18 | 435 | mutex_lock(&dev->ctxlist_mutex); |
bd1b331f | 436 | if (!list_empty(&dev->ctxlist)) { |
55910517 | 437 | struct drm_ctx_list *pos, *n; |
1da177e4 | 438 | |
bd1b331f | 439 | list_for_each_entry_safe(pos, n, &dev->ctxlist, head) { |
c153f45f | 440 | if (pos->handle == ctx->handle) { |
b5e89ed5 | 441 | list_del(&pos->head); |
9a298b2a | 442 | kfree(pos); |
1da177e4 LT |
443 | --dev->ctx_count; |
444 | } | |
445 | } | |
446 | } | |
30e2fb18 | 447 | mutex_unlock(&dev->ctxlist_mutex); |
1da177e4 LT |
448 | |
449 | return 0; | |
450 | } | |
451 | ||
452 | /*@}*/ |