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Commit | Line | Data |
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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 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 DA |
77 | int new_id; |
78 | int ret; | |
1da177e4 | 79 | |
62968144 DA |
80 | again: |
81 | if (idr_pre_get(&dev->ctx_idr, GFP_KERNEL) == 0) { | |
82 | DRM_ERROR("Out of memory expanding drawable idr\n"); | |
83 | return -ENOMEM; | |
84 | } | |
30e2fb18 | 85 | mutex_lock(&dev->struct_mutex); |
62968144 DA |
86 | ret = idr_get_new_above(&dev->ctx_idr, NULL, |
87 | DRM_RESERVED_CONTEXTS, &new_id); | |
30e2fb18 | 88 | mutex_unlock(&dev->struct_mutex); |
f1ae126c VS |
89 | if (ret == -EAGAIN) |
90 | goto again; | |
91 | else if (ret) | |
92 | return ret; | |
93 | ||
62968144 | 94 | return new_id; |
1da177e4 LT |
95 | } |
96 | ||
97 | /** | |
98 | * Context bitmap initialization. | |
99 | * | |
100 | * \param dev DRM device. | |
101 | * | |
62968144 | 102 | * Initialise the drm_device::ctx_idr |
1da177e4 | 103 | */ |
84b1fd10 | 104 | int drm_ctxbitmap_init(struct drm_device * dev) |
1da177e4 | 105 | { |
62968144 | 106 | idr_init(&dev->ctx_idr); |
1da177e4 LT |
107 | return 0; |
108 | } | |
109 | ||
110 | /** | |
111 | * Context bitmap cleanup. | |
112 | * | |
113 | * \param dev DRM device. | |
114 | * | |
62968144 DA |
115 | * Free all idr members using drm_ctx_sarea_free helper function |
116 | * while holding the drm_device::struct_mutex lock. | |
1da177e4 | 117 | */ |
84b1fd10 | 118 | void drm_ctxbitmap_cleanup(struct drm_device * dev) |
1da177e4 | 119 | { |
30e2fb18 | 120 | mutex_lock(&dev->struct_mutex); |
62968144 | 121 | idr_remove_all(&dev->ctx_idr); |
30e2fb18 | 122 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
123 | } |
124 | ||
125 | /*@}*/ | |
126 | ||
127 | /******************************************************************/ | |
128 | /** \name Per Context SAREA Support */ | |
129 | /*@{*/ | |
130 | ||
131 | /** | |
132 | * Get per-context SAREA. | |
b5e89ed5 | 133 | * |
1da177e4 | 134 | * \param inode device inode. |
6c340eac | 135 | * \param file_priv DRM file private. |
1da177e4 LT |
136 | * \param cmd command. |
137 | * \param arg user argument pointing to a drm_ctx_priv_map structure. | |
138 | * \return zero on success or a negative number on failure. | |
139 | * | |
62968144 | 140 | * Gets the map from drm_device::ctx_idr with the handle specified and |
1da177e4 LT |
141 | * returns its handle. |
142 | */ | |
c153f45f EA |
143 | int drm_getsareactx(struct drm_device *dev, void *data, |
144 | struct drm_file *file_priv) | |
1da177e4 | 145 | { |
c153f45f | 146 | struct drm_ctx_priv_map *request = data; |
f77d390c | 147 | struct drm_local_map *map; |
55910517 | 148 | struct drm_map_list *_entry; |
1da177e4 | 149 | |
30e2fb18 | 150 | mutex_lock(&dev->struct_mutex); |
62968144 | 151 | |
c153f45f | 152 | map = idr_find(&dev->ctx_idr, request->ctx_id); |
62968144 | 153 | if (!map) { |
30e2fb18 | 154 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
155 | return -EINVAL; |
156 | } | |
157 | ||
c153f45f | 158 | request->handle = NULL; |
bd1b331f | 159 | list_for_each_entry(_entry, &dev->maplist, head) { |
d1f2b55a | 160 | if (_entry->map == map) { |
bc5f4523 | 161 | request->handle = |
b5e89ed5 | 162 | (void *)(unsigned long)_entry->user_token; |
d1f2b55a DA |
163 | break; |
164 | } | |
165 | } | |
09b4ea47 IH |
166 | |
167 | mutex_unlock(&dev->struct_mutex); | |
168 | ||
c153f45f | 169 | if (request->handle == NULL) |
d1f2b55a DA |
170 | return -EINVAL; |
171 | ||
1da177e4 LT |
172 | return 0; |
173 | } | |
174 | ||
175 | /** | |
176 | * Set per-context SAREA. | |
b5e89ed5 | 177 | * |
1da177e4 | 178 | * \param inode device inode. |
6c340eac | 179 | * \param file_priv DRM file private. |
1da177e4 LT |
180 | * \param cmd command. |
181 | * \param arg user argument pointing to a drm_ctx_priv_map structure. | |
182 | * \return zero on success or a negative number on failure. | |
183 | * | |
184 | * Searches the mapping specified in \p arg and update the entry in | |
62968144 | 185 | * drm_device::ctx_idr with it. |
1da177e4 | 186 | */ |
c153f45f EA |
187 | int drm_setsareactx(struct drm_device *dev, void *data, |
188 | struct drm_file *file_priv) | |
1da177e4 | 189 | { |
c153f45f | 190 | struct drm_ctx_priv_map *request = data; |
f77d390c | 191 | struct drm_local_map *map = NULL; |
55910517 | 192 | struct drm_map_list *r_list = NULL; |
1da177e4 | 193 | |
30e2fb18 | 194 | mutex_lock(&dev->struct_mutex); |
bd1b331f | 195 | list_for_each_entry(r_list, &dev->maplist, head) { |
9a186645 | 196 | if (r_list->map |
c153f45f | 197 | && r_list->user_token == (unsigned long) request->handle) |
1da177e4 LT |
198 | goto found; |
199 | } | |
b5e89ed5 | 200 | bad: |
30e2fb18 | 201 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
202 | return -EINVAL; |
203 | ||
b5e89ed5 | 204 | found: |
1da177e4 | 205 | map = r_list->map; |
b5e89ed5 DA |
206 | if (!map) |
207 | goto bad; | |
62968144 | 208 | |
c153f45f | 209 | if (IS_ERR(idr_replace(&dev->ctx_idr, map, request->ctx_id))) |
1da177e4 | 210 | goto bad; |
62968144 | 211 | |
30e2fb18 | 212 | mutex_unlock(&dev->struct_mutex); |
c153f45f | 213 | |
1da177e4 LT |
214 | return 0; |
215 | } | |
216 | ||
217 | /*@}*/ | |
218 | ||
219 | /******************************************************************/ | |
220 | /** \name The actual DRM context handling routines */ | |
221 | /*@{*/ | |
222 | ||
223 | /** | |
224 | * Switch context. | |
225 | * | |
226 | * \param dev DRM device. | |
227 | * \param old old context handle. | |
228 | * \param new new context handle. | |
229 | * \return zero on success or a negative number on failure. | |
230 | * | |
231 | * Attempt to set drm_device::context_flag. | |
232 | */ | |
84b1fd10 | 233 | static int drm_context_switch(struct drm_device * dev, int old, int new) |
1da177e4 | 234 | { |
b5e89ed5 DA |
235 | if (test_and_set_bit(0, &dev->context_flag)) { |
236 | DRM_ERROR("Reentering -- FIXME\n"); | |
237 | return -EBUSY; | |
238 | } | |
1da177e4 | 239 | |
b5e89ed5 | 240 | DRM_DEBUG("Context switch from %d to %d\n", old, new); |
1da177e4 | 241 | |
b5e89ed5 DA |
242 | if (new == dev->last_context) { |
243 | clear_bit(0, &dev->context_flag); | |
244 | return 0; | |
245 | } | |
1da177e4 | 246 | |
b5e89ed5 | 247 | return 0; |
1da177e4 LT |
248 | } |
249 | ||
250 | /** | |
251 | * Complete context switch. | |
252 | * | |
253 | * \param dev DRM device. | |
254 | * \param new new context handle. | |
255 | * \return zero on success or a negative number on failure. | |
256 | * | |
257 | * Updates drm_device::last_context and drm_device::last_switch. Verifies the | |
258 | * hardware lock is held, clears the drm_device::context_flag and wakes up | |
259 | * drm_device::context_wait. | |
260 | */ | |
7c1c2871 DA |
261 | static int drm_context_switch_complete(struct drm_device *dev, |
262 | struct drm_file *file_priv, int new) | |
1da177e4 | 263 | { |
b5e89ed5 DA |
264 | dev->last_context = new; /* PRE/POST: This is the _only_ writer. */ |
265 | dev->last_switch = jiffies; | |
1da177e4 | 266 | |
7c1c2871 | 267 | if (!_DRM_LOCK_IS_HELD(file_priv->master->lock.hw_lock->lock)) { |
b5e89ed5 DA |
268 | DRM_ERROR("Lock isn't held after context switch\n"); |
269 | } | |
1da177e4 | 270 | |
b5e89ed5 DA |
271 | /* If a context switch is ever initiated |
272 | when the kernel holds the lock, release | |
273 | that lock here. */ | |
274 | clear_bit(0, &dev->context_flag); | |
275 | wake_up(&dev->context_wait); | |
1da177e4 | 276 | |
b5e89ed5 | 277 | return 0; |
1da177e4 LT |
278 | } |
279 | ||
280 | /** | |
281 | * Reserve contexts. | |
282 | * | |
283 | * \param inode device inode. | |
6c340eac | 284 | * \param file_priv DRM file private. |
1da177e4 LT |
285 | * \param cmd command. |
286 | * \param arg user argument pointing to a drm_ctx_res structure. | |
287 | * \return zero on success or a negative number on failure. | |
288 | */ | |
c153f45f EA |
289 | int drm_resctx(struct drm_device *dev, void *data, |
290 | struct drm_file *file_priv) | |
1da177e4 | 291 | { |
c153f45f | 292 | struct drm_ctx_res *res = data; |
c60ce623 | 293 | struct drm_ctx ctx; |
1da177e4 LT |
294 | int i; |
295 | ||
c153f45f | 296 | if (res->count >= DRM_RESERVED_CONTEXTS) { |
b5e89ed5 DA |
297 | memset(&ctx, 0, sizeof(ctx)); |
298 | for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) { | |
1da177e4 | 299 | ctx.handle = i; |
c153f45f | 300 | if (copy_to_user(&res->contexts[i], &ctx, sizeof(ctx))) |
1da177e4 LT |
301 | return -EFAULT; |
302 | } | |
303 | } | |
c153f45f | 304 | res->count = DRM_RESERVED_CONTEXTS; |
1da177e4 | 305 | |
1da177e4 LT |
306 | return 0; |
307 | } | |
308 | ||
309 | /** | |
310 | * Add context. | |
311 | * | |
312 | * \param inode device inode. | |
6c340eac | 313 | * \param file_priv DRM file private. |
1da177e4 LT |
314 | * \param cmd command. |
315 | * \param arg user argument pointing to a drm_ctx structure. | |
316 | * \return zero on success or a negative number on failure. | |
317 | * | |
318 | * Get a new handle for the context and copy to userspace. | |
319 | */ | |
c153f45f EA |
320 | int drm_addctx(struct drm_device *dev, void *data, |
321 | struct drm_file *file_priv) | |
1da177e4 | 322 | { |
55910517 | 323 | struct drm_ctx_list *ctx_entry; |
c153f45f | 324 | struct drm_ctx *ctx = data; |
1da177e4 | 325 | |
c153f45f EA |
326 | ctx->handle = drm_ctxbitmap_next(dev); |
327 | if (ctx->handle == DRM_KERNEL_CONTEXT) { | |
b5e89ed5 | 328 | /* Skip kernel's context and get a new one. */ |
c153f45f | 329 | ctx->handle = drm_ctxbitmap_next(dev); |
1da177e4 | 330 | } |
c153f45f EA |
331 | DRM_DEBUG("%d\n", ctx->handle); |
332 | if (ctx->handle == -1) { | |
b5e89ed5 DA |
333 | DRM_DEBUG("Not enough free contexts.\n"); |
334 | /* Should this return -EBUSY instead? */ | |
1da177e4 LT |
335 | return -ENOMEM; |
336 | } | |
337 | ||
9a298b2a | 338 | ctx_entry = kmalloc(sizeof(*ctx_entry), GFP_KERNEL); |
b5e89ed5 | 339 | if (!ctx_entry) { |
1da177e4 LT |
340 | DRM_DEBUG("out of memory\n"); |
341 | return -ENOMEM; | |
342 | } | |
343 | ||
b5e89ed5 | 344 | INIT_LIST_HEAD(&ctx_entry->head); |
c153f45f | 345 | ctx_entry->handle = ctx->handle; |
6c340eac | 346 | ctx_entry->tag = file_priv; |
1da177e4 | 347 | |
30e2fb18 | 348 | mutex_lock(&dev->ctxlist_mutex); |
bd1b331f | 349 | list_add(&ctx_entry->head, &dev->ctxlist); |
1da177e4 | 350 | ++dev->ctx_count; |
30e2fb18 | 351 | mutex_unlock(&dev->ctxlist_mutex); |
1da177e4 | 352 | |
1da177e4 LT |
353 | return 0; |
354 | } | |
355 | ||
c153f45f | 356 | int drm_modctx(struct drm_device *dev, void *data, struct drm_file *file_priv) |
1da177e4 LT |
357 | { |
358 | /* This does nothing */ | |
359 | return 0; | |
360 | } | |
361 | ||
362 | /** | |
363 | * Get context. | |
364 | * | |
365 | * \param inode device inode. | |
6c340eac | 366 | * \param file_priv DRM file private. |
1da177e4 LT |
367 | * \param cmd command. |
368 | * \param arg user argument pointing to a drm_ctx structure. | |
369 | * \return zero on success or a negative number on failure. | |
370 | */ | |
c153f45f | 371 | int drm_getctx(struct drm_device *dev, void *data, struct drm_file *file_priv) |
1da177e4 | 372 | { |
c153f45f | 373 | struct drm_ctx *ctx = data; |
1da177e4 LT |
374 | |
375 | /* This is 0, because we don't handle any context flags */ | |
c153f45f | 376 | ctx->flags = 0; |
1da177e4 | 377 | |
1da177e4 LT |
378 | return 0; |
379 | } | |
380 | ||
381 | /** | |
382 | * Switch context. | |
383 | * | |
384 | * \param inode device inode. | |
6c340eac | 385 | * \param file_priv DRM file private. |
1da177e4 LT |
386 | * \param cmd command. |
387 | * \param arg user argument pointing to a drm_ctx structure. | |
388 | * \return zero on success or a negative number on failure. | |
389 | * | |
390 | * Calls context_switch(). | |
391 | */ | |
c153f45f EA |
392 | int drm_switchctx(struct drm_device *dev, void *data, |
393 | struct drm_file *file_priv) | |
1da177e4 | 394 | { |
c153f45f | 395 | struct drm_ctx *ctx = data; |
1da177e4 | 396 | |
c153f45f EA |
397 | DRM_DEBUG("%d\n", ctx->handle); |
398 | return drm_context_switch(dev, dev->last_context, ctx->handle); | |
1da177e4 LT |
399 | } |
400 | ||
401 | /** | |
402 | * New context. | |
403 | * | |
404 | * \param inode device inode. | |
6c340eac | 405 | * \param file_priv DRM file private. |
1da177e4 LT |
406 | * \param cmd command. |
407 | * \param arg user argument pointing to a drm_ctx structure. | |
408 | * \return zero on success or a negative number on failure. | |
409 | * | |
410 | * Calls context_switch_complete(). | |
411 | */ | |
c153f45f EA |
412 | int drm_newctx(struct drm_device *dev, void *data, |
413 | struct drm_file *file_priv) | |
1da177e4 | 414 | { |
c153f45f | 415 | struct drm_ctx *ctx = data; |
1da177e4 | 416 | |
c153f45f | 417 | DRM_DEBUG("%d\n", ctx->handle); |
7c1c2871 | 418 | drm_context_switch_complete(dev, file_priv, ctx->handle); |
1da177e4 LT |
419 | |
420 | return 0; | |
421 | } | |
422 | ||
423 | /** | |
424 | * Remove context. | |
425 | * | |
426 | * \param inode device inode. | |
6c340eac | 427 | * \param file_priv DRM file private. |
1da177e4 LT |
428 | * \param cmd command. |
429 | * \param arg user argument pointing to a drm_ctx structure. | |
430 | * \return zero on success or a negative number on failure. | |
431 | * | |
432 | * If not the special kernel context, calls ctxbitmap_free() to free the specified context. | |
433 | */ | |
c153f45f EA |
434 | int drm_rmctx(struct drm_device *dev, void *data, |
435 | struct drm_file *file_priv) | |
1da177e4 | 436 | { |
c153f45f | 437 | struct drm_ctx *ctx = data; |
1da177e4 | 438 | |
c153f45f | 439 | DRM_DEBUG("%d\n", ctx->handle); |
c153f45f | 440 | if (ctx->handle != DRM_KERNEL_CONTEXT) { |
1da177e4 | 441 | if (dev->driver->context_dtor) |
c153f45f EA |
442 | dev->driver->context_dtor(dev, ctx->handle); |
443 | drm_ctxbitmap_free(dev, ctx->handle); | |
1da177e4 LT |
444 | } |
445 | ||
30e2fb18 | 446 | mutex_lock(&dev->ctxlist_mutex); |
bd1b331f | 447 | if (!list_empty(&dev->ctxlist)) { |
55910517 | 448 | struct drm_ctx_list *pos, *n; |
1da177e4 | 449 | |
bd1b331f | 450 | list_for_each_entry_safe(pos, n, &dev->ctxlist, head) { |
c153f45f | 451 | if (pos->handle == ctx->handle) { |
b5e89ed5 | 452 | list_del(&pos->head); |
9a298b2a | 453 | kfree(pos); |
1da177e4 LT |
454 | --dev->ctx_count; |
455 | } | |
456 | } | |
457 | } | |
30e2fb18 | 458 | mutex_unlock(&dev->ctxlist_mutex); |
1da177e4 LT |
459 | |
460 | return 0; | |
461 | } | |
462 | ||
463 | /*@}*/ |