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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 | 44 | |
c21eb21c DA |
45 | /******************************************************************/ |
46 | /** \name Context bitmap support */ | |
47 | /*@{*/ | |
48 | ||
1da177e4 LT |
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 | */ | |
c21eb21c | 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 | */ |
c21eb21c | 93 | int drm_ctxbitmap_init(struct drm_device * dev) |
1da177e4 | 94 | { |
62968144 | 95 | idr_init(&dev->ctx_idr); |
c21eb21c | 96 | return 0; |
1da177e4 LT |
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 | */ |
c21eb21c | 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 | ||
9f8d21ea DH |
114 | /** |
115 | * drm_ctxbitmap_flush() - Flush all contexts owned by a file | |
116 | * @dev: DRM device to operate on | |
117 | * @file: Open file to flush contexts for | |
118 | * | |
119 | * This iterates over all contexts on @dev and drops them if they're owned by | |
120 | * @file. Note that after this call returns, new contexts might be added if | |
121 | * the file is still alive. | |
122 | */ | |
123 | void drm_ctxbitmap_flush(struct drm_device *dev, struct drm_file *file) | |
124 | { | |
125 | struct drm_ctx_list *pos, *tmp; | |
126 | ||
127 | mutex_lock(&dev->ctxlist_mutex); | |
128 | ||
129 | list_for_each_entry_safe(pos, tmp, &dev->ctxlist, head) { | |
130 | if (pos->tag == file && | |
131 | pos->handle != DRM_KERNEL_CONTEXT) { | |
132 | if (dev->driver->context_dtor) | |
133 | dev->driver->context_dtor(dev, pos->handle); | |
134 | ||
135 | drm_ctxbitmap_free(dev, pos->handle); | |
136 | list_del(&pos->head); | |
137 | kfree(pos); | |
138 | } | |
139 | } | |
140 | ||
141 | mutex_unlock(&dev->ctxlist_mutex); | |
142 | } | |
143 | ||
1da177e4 LT |
144 | /*@}*/ |
145 | ||
146 | /******************************************************************/ | |
147 | /** \name Per Context SAREA Support */ | |
148 | /*@{*/ | |
149 | ||
150 | /** | |
151 | * Get per-context SAREA. | |
b5e89ed5 | 152 | * |
1da177e4 | 153 | * \param inode device inode. |
6c340eac | 154 | * \param file_priv DRM file private. |
1da177e4 LT |
155 | * \param cmd command. |
156 | * \param arg user argument pointing to a drm_ctx_priv_map structure. | |
157 | * \return zero on success or a negative number on failure. | |
158 | * | |
62968144 | 159 | * Gets the map from drm_device::ctx_idr with the handle specified and |
1da177e4 LT |
160 | * returns its handle. |
161 | */ | |
c153f45f EA |
162 | int drm_getsareactx(struct drm_device *dev, void *data, |
163 | struct drm_file *file_priv) | |
1da177e4 | 164 | { |
c153f45f | 165 | struct drm_ctx_priv_map *request = data; |
f77d390c | 166 | struct drm_local_map *map; |
55910517 | 167 | struct drm_map_list *_entry; |
1da177e4 | 168 | |
30e2fb18 | 169 | mutex_lock(&dev->struct_mutex); |
62968144 | 170 | |
c153f45f | 171 | map = idr_find(&dev->ctx_idr, request->ctx_id); |
62968144 | 172 | if (!map) { |
30e2fb18 | 173 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
174 | return -EINVAL; |
175 | } | |
176 | ||
c153f45f | 177 | request->handle = NULL; |
bd1b331f | 178 | list_for_each_entry(_entry, &dev->maplist, head) { |
d1f2b55a | 179 | if (_entry->map == map) { |
bc5f4523 | 180 | request->handle = |
b5e89ed5 | 181 | (void *)(unsigned long)_entry->user_token; |
d1f2b55a DA |
182 | break; |
183 | } | |
184 | } | |
09b4ea47 IH |
185 | |
186 | mutex_unlock(&dev->struct_mutex); | |
187 | ||
c153f45f | 188 | if (request->handle == NULL) |
d1f2b55a DA |
189 | return -EINVAL; |
190 | ||
1da177e4 LT |
191 | return 0; |
192 | } | |
193 | ||
194 | /** | |
195 | * Set per-context SAREA. | |
b5e89ed5 | 196 | * |
1da177e4 | 197 | * \param inode device inode. |
6c340eac | 198 | * \param file_priv DRM file private. |
1da177e4 LT |
199 | * \param cmd command. |
200 | * \param arg user argument pointing to a drm_ctx_priv_map structure. | |
201 | * \return zero on success or a negative number on failure. | |
202 | * | |
203 | * Searches the mapping specified in \p arg and update the entry in | |
62968144 | 204 | * drm_device::ctx_idr with it. |
1da177e4 | 205 | */ |
c153f45f EA |
206 | int drm_setsareactx(struct drm_device *dev, void *data, |
207 | struct drm_file *file_priv) | |
1da177e4 | 208 | { |
c153f45f | 209 | struct drm_ctx_priv_map *request = data; |
f77d390c | 210 | struct drm_local_map *map = NULL; |
55910517 | 211 | struct drm_map_list *r_list = NULL; |
1da177e4 | 212 | |
30e2fb18 | 213 | mutex_lock(&dev->struct_mutex); |
bd1b331f | 214 | list_for_each_entry(r_list, &dev->maplist, head) { |
9a186645 | 215 | if (r_list->map |
c153f45f | 216 | && r_list->user_token == (unsigned long) request->handle) |
1da177e4 LT |
217 | goto found; |
218 | } | |
b5e89ed5 | 219 | bad: |
30e2fb18 | 220 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
221 | return -EINVAL; |
222 | ||
b5e89ed5 | 223 | found: |
1da177e4 | 224 | map = r_list->map; |
b5e89ed5 DA |
225 | if (!map) |
226 | goto bad; | |
62968144 | 227 | |
c153f45f | 228 | if (IS_ERR(idr_replace(&dev->ctx_idr, map, request->ctx_id))) |
1da177e4 | 229 | goto bad; |
62968144 | 230 | |
30e2fb18 | 231 | mutex_unlock(&dev->struct_mutex); |
c153f45f | 232 | |
1da177e4 LT |
233 | return 0; |
234 | } | |
235 | ||
236 | /*@}*/ | |
237 | ||
238 | /******************************************************************/ | |
239 | /** \name The actual DRM context handling routines */ | |
240 | /*@{*/ | |
241 | ||
242 | /** | |
243 | * Switch context. | |
244 | * | |
245 | * \param dev DRM device. | |
246 | * \param old old context handle. | |
247 | * \param new new context handle. | |
248 | * \return zero on success or a negative number on failure. | |
249 | * | |
250 | * Attempt to set drm_device::context_flag. | |
251 | */ | |
84b1fd10 | 252 | static int drm_context_switch(struct drm_device * dev, int old, int new) |
1da177e4 | 253 | { |
b5e89ed5 DA |
254 | if (test_and_set_bit(0, &dev->context_flag)) { |
255 | DRM_ERROR("Reentering -- FIXME\n"); | |
256 | return -EBUSY; | |
257 | } | |
1da177e4 | 258 | |
b5e89ed5 | 259 | DRM_DEBUG("Context switch from %d to %d\n", old, new); |
1da177e4 | 260 | |
b5e89ed5 DA |
261 | if (new == dev->last_context) { |
262 | clear_bit(0, &dev->context_flag); | |
263 | return 0; | |
264 | } | |
1da177e4 | 265 | |
b5e89ed5 | 266 | return 0; |
1da177e4 LT |
267 | } |
268 | ||
269 | /** | |
270 | * Complete context switch. | |
271 | * | |
272 | * \param dev DRM device. | |
273 | * \param new new context handle. | |
274 | * \return zero on success or a negative number on failure. | |
275 | * | |
276 | * Updates drm_device::last_context and drm_device::last_switch. Verifies the | |
277 | * hardware lock is held, clears the drm_device::context_flag and wakes up | |
278 | * drm_device::context_wait. | |
279 | */ | |
7c1c2871 DA |
280 | static int drm_context_switch_complete(struct drm_device *dev, |
281 | struct drm_file *file_priv, int new) | |
1da177e4 | 282 | { |
b5e89ed5 | 283 | dev->last_context = new; /* PRE/POST: This is the _only_ writer. */ |
1da177e4 | 284 | |
7c1c2871 | 285 | if (!_DRM_LOCK_IS_HELD(file_priv->master->lock.hw_lock->lock)) { |
b5e89ed5 DA |
286 | DRM_ERROR("Lock isn't held after context switch\n"); |
287 | } | |
1da177e4 | 288 | |
b5e89ed5 DA |
289 | /* If a context switch is ever initiated |
290 | when the kernel holds the lock, release | |
291 | that lock here. */ | |
292 | clear_bit(0, &dev->context_flag); | |
1da177e4 | 293 | |
b5e89ed5 | 294 | return 0; |
1da177e4 LT |
295 | } |
296 | ||
297 | /** | |
298 | * Reserve contexts. | |
299 | * | |
300 | * \param inode device inode. | |
6c340eac | 301 | * \param file_priv DRM file private. |
1da177e4 LT |
302 | * \param cmd command. |
303 | * \param arg user argument pointing to a drm_ctx_res structure. | |
304 | * \return zero on success or a negative number on failure. | |
305 | */ | |
c153f45f EA |
306 | int drm_resctx(struct drm_device *dev, void *data, |
307 | struct drm_file *file_priv) | |
1da177e4 | 308 | { |
c153f45f | 309 | struct drm_ctx_res *res = data; |
c60ce623 | 310 | struct drm_ctx ctx; |
1da177e4 LT |
311 | int i; |
312 | ||
c153f45f | 313 | if (res->count >= DRM_RESERVED_CONTEXTS) { |
b5e89ed5 DA |
314 | memset(&ctx, 0, sizeof(ctx)); |
315 | for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) { | |
1da177e4 | 316 | ctx.handle = i; |
c153f45f | 317 | if (copy_to_user(&res->contexts[i], &ctx, sizeof(ctx))) |
1da177e4 LT |
318 | return -EFAULT; |
319 | } | |
320 | } | |
c153f45f | 321 | res->count = DRM_RESERVED_CONTEXTS; |
1da177e4 | 322 | |
1da177e4 LT |
323 | return 0; |
324 | } | |
325 | ||
326 | /** | |
327 | * Add context. | |
328 | * | |
329 | * \param inode device inode. | |
6c340eac | 330 | * \param file_priv DRM file private. |
1da177e4 LT |
331 | * \param cmd command. |
332 | * \param arg user argument pointing to a drm_ctx structure. | |
333 | * \return zero on success or a negative number on failure. | |
334 | * | |
335 | * Get a new handle for the context and copy to userspace. | |
336 | */ | |
c153f45f EA |
337 | int drm_addctx(struct drm_device *dev, void *data, |
338 | struct drm_file *file_priv) | |
1da177e4 | 339 | { |
55910517 | 340 | struct drm_ctx_list *ctx_entry; |
c153f45f | 341 | struct drm_ctx *ctx = data; |
1da177e4 | 342 | |
c153f45f EA |
343 | ctx->handle = drm_ctxbitmap_next(dev); |
344 | if (ctx->handle == DRM_KERNEL_CONTEXT) { | |
b5e89ed5 | 345 | /* Skip kernel's context and get a new one. */ |
c153f45f | 346 | ctx->handle = drm_ctxbitmap_next(dev); |
1da177e4 | 347 | } |
c153f45f EA |
348 | DRM_DEBUG("%d\n", ctx->handle); |
349 | if (ctx->handle == -1) { | |
b5e89ed5 DA |
350 | DRM_DEBUG("Not enough free contexts.\n"); |
351 | /* Should this return -EBUSY instead? */ | |
1da177e4 LT |
352 | return -ENOMEM; |
353 | } | |
354 | ||
9a298b2a | 355 | ctx_entry = kmalloc(sizeof(*ctx_entry), GFP_KERNEL); |
b5e89ed5 | 356 | if (!ctx_entry) { |
1da177e4 LT |
357 | DRM_DEBUG("out of memory\n"); |
358 | return -ENOMEM; | |
359 | } | |
360 | ||
b5e89ed5 | 361 | INIT_LIST_HEAD(&ctx_entry->head); |
c153f45f | 362 | ctx_entry->handle = ctx->handle; |
6c340eac | 363 | ctx_entry->tag = file_priv; |
1da177e4 | 364 | |
30e2fb18 | 365 | mutex_lock(&dev->ctxlist_mutex); |
bd1b331f | 366 | list_add(&ctx_entry->head, &dev->ctxlist); |
30e2fb18 | 367 | mutex_unlock(&dev->ctxlist_mutex); |
1da177e4 | 368 | |
1da177e4 LT |
369 | return 0; |
370 | } | |
371 | ||
1da177e4 LT |
372 | /** |
373 | * Get context. | |
374 | * | |
375 | * \param inode device inode. | |
6c340eac | 376 | * \param file_priv DRM file private. |
1da177e4 LT |
377 | * \param cmd command. |
378 | * \param arg user argument pointing to a drm_ctx structure. | |
379 | * \return zero on success or a negative number on failure. | |
380 | */ | |
c153f45f | 381 | int drm_getctx(struct drm_device *dev, void *data, struct drm_file *file_priv) |
1da177e4 | 382 | { |
c153f45f | 383 | struct drm_ctx *ctx = data; |
1da177e4 LT |
384 | |
385 | /* This is 0, because we don't handle any context flags */ | |
c153f45f | 386 | ctx->flags = 0; |
1da177e4 | 387 | |
1da177e4 LT |
388 | return 0; |
389 | } | |
390 | ||
391 | /** | |
392 | * Switch context. | |
393 | * | |
394 | * \param inode device inode. | |
6c340eac | 395 | * \param file_priv DRM file private. |
1da177e4 LT |
396 | * \param cmd command. |
397 | * \param arg user argument pointing to a drm_ctx structure. | |
398 | * \return zero on success or a negative number on failure. | |
399 | * | |
400 | * Calls context_switch(). | |
401 | */ | |
c153f45f EA |
402 | int drm_switchctx(struct drm_device *dev, void *data, |
403 | struct drm_file *file_priv) | |
1da177e4 | 404 | { |
c153f45f | 405 | struct drm_ctx *ctx = data; |
1da177e4 | 406 | |
c153f45f EA |
407 | DRM_DEBUG("%d\n", ctx->handle); |
408 | return drm_context_switch(dev, dev->last_context, ctx->handle); | |
1da177e4 LT |
409 | } |
410 | ||
411 | /** | |
412 | * New context. | |
413 | * | |
414 | * \param inode device inode. | |
6c340eac | 415 | * \param file_priv DRM file private. |
1da177e4 LT |
416 | * \param cmd command. |
417 | * \param arg user argument pointing to a drm_ctx structure. | |
418 | * \return zero on success or a negative number on failure. | |
419 | * | |
420 | * Calls context_switch_complete(). | |
421 | */ | |
c153f45f EA |
422 | int drm_newctx(struct drm_device *dev, void *data, |
423 | struct drm_file *file_priv) | |
1da177e4 | 424 | { |
c153f45f | 425 | struct drm_ctx *ctx = data; |
1da177e4 | 426 | |
c153f45f | 427 | DRM_DEBUG("%d\n", ctx->handle); |
7c1c2871 | 428 | drm_context_switch_complete(dev, file_priv, ctx->handle); |
1da177e4 LT |
429 | |
430 | return 0; | |
431 | } | |
432 | ||
433 | /** | |
434 | * Remove context. | |
435 | * | |
436 | * \param inode device inode. | |
6c340eac | 437 | * \param file_priv DRM file private. |
1da177e4 LT |
438 | * \param cmd command. |
439 | * \param arg user argument pointing to a drm_ctx structure. | |
440 | * \return zero on success or a negative number on failure. | |
441 | * | |
442 | * If not the special kernel context, calls ctxbitmap_free() to free the specified context. | |
443 | */ | |
c153f45f EA |
444 | int drm_rmctx(struct drm_device *dev, void *data, |
445 | struct drm_file *file_priv) | |
1da177e4 | 446 | { |
c153f45f | 447 | struct drm_ctx *ctx = data; |
1da177e4 | 448 | |
c153f45f | 449 | DRM_DEBUG("%d\n", ctx->handle); |
c153f45f | 450 | if (ctx->handle != DRM_KERNEL_CONTEXT) { |
1da177e4 | 451 | if (dev->driver->context_dtor) |
c153f45f EA |
452 | dev->driver->context_dtor(dev, ctx->handle); |
453 | drm_ctxbitmap_free(dev, ctx->handle); | |
1da177e4 LT |
454 | } |
455 | ||
30e2fb18 | 456 | mutex_lock(&dev->ctxlist_mutex); |
bd1b331f | 457 | if (!list_empty(&dev->ctxlist)) { |
55910517 | 458 | struct drm_ctx_list *pos, *n; |
1da177e4 | 459 | |
bd1b331f | 460 | list_for_each_entry_safe(pos, n, &dev->ctxlist, head) { |
c153f45f | 461 | if (pos->handle == ctx->handle) { |
b5e89ed5 | 462 | list_del(&pos->head); |
9a298b2a | 463 | kfree(pos); |
1da177e4 LT |
464 | } |
465 | } | |
466 | } | |
30e2fb18 | 467 | mutex_unlock(&dev->ctxlist_mutex); |
1da177e4 LT |
468 | |
469 | return 0; | |
470 | } | |
471 | ||
472 | /*@}*/ |