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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 | ||
43 | #include "drmP.h" | |
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); | |
88 | if (ret == -EAGAIN) { | |
30e2fb18 | 89 | mutex_unlock(&dev->struct_mutex); |
62968144 | 90 | goto again; |
1da177e4 | 91 | } |
30e2fb18 | 92 | mutex_unlock(&dev->struct_mutex); |
62968144 | 93 | return new_id; |
1da177e4 LT |
94 | } |
95 | ||
96 | /** | |
97 | * Context bitmap initialization. | |
98 | * | |
99 | * \param dev DRM device. | |
100 | * | |
62968144 | 101 | * Initialise the drm_device::ctx_idr |
1da177e4 | 102 | */ |
84b1fd10 | 103 | int drm_ctxbitmap_init(struct drm_device * dev) |
1da177e4 | 104 | { |
62968144 | 105 | idr_init(&dev->ctx_idr); |
1da177e4 LT |
106 | return 0; |
107 | } | |
108 | ||
109 | /** | |
110 | * Context bitmap cleanup. | |
111 | * | |
112 | * \param dev DRM device. | |
113 | * | |
62968144 DA |
114 | * Free all idr members using drm_ctx_sarea_free helper function |
115 | * while holding the drm_device::struct_mutex lock. | |
1da177e4 | 116 | */ |
84b1fd10 | 117 | void drm_ctxbitmap_cleanup(struct drm_device * dev) |
1da177e4 | 118 | { |
30e2fb18 | 119 | mutex_lock(&dev->struct_mutex); |
62968144 | 120 | idr_remove_all(&dev->ctx_idr); |
30e2fb18 | 121 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
122 | } |
123 | ||
124 | /*@}*/ | |
125 | ||
126 | /******************************************************************/ | |
127 | /** \name Per Context SAREA Support */ | |
128 | /*@{*/ | |
129 | ||
130 | /** | |
131 | * Get per-context SAREA. | |
b5e89ed5 | 132 | * |
1da177e4 | 133 | * \param inode device inode. |
6c340eac | 134 | * \param file_priv DRM file private. |
1da177e4 LT |
135 | * \param cmd command. |
136 | * \param arg user argument pointing to a drm_ctx_priv_map structure. | |
137 | * \return zero on success or a negative number on failure. | |
138 | * | |
62968144 | 139 | * Gets the map from drm_device::ctx_idr with the handle specified and |
1da177e4 LT |
140 | * returns its handle. |
141 | */ | |
c153f45f EA |
142 | int drm_getsareactx(struct drm_device *dev, void *data, |
143 | struct drm_file *file_priv) | |
1da177e4 | 144 | { |
c153f45f | 145 | struct drm_ctx_priv_map *request = data; |
c60ce623 | 146 | struct drm_map *map; |
55910517 | 147 | struct drm_map_list *_entry; |
1da177e4 | 148 | |
30e2fb18 | 149 | mutex_lock(&dev->struct_mutex); |
62968144 | 150 | |
c153f45f | 151 | map = idr_find(&dev->ctx_idr, request->ctx_id); |
62968144 | 152 | if (!map) { |
30e2fb18 | 153 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
154 | return -EINVAL; |
155 | } | |
156 | ||
30e2fb18 | 157 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 158 | |
c153f45f | 159 | request->handle = NULL; |
bd1b331f | 160 | list_for_each_entry(_entry, &dev->maplist, head) { |
d1f2b55a | 161 | if (_entry->map == map) { |
c153f45f | 162 | request->handle = |
b5e89ed5 | 163 | (void *)(unsigned long)_entry->user_token; |
d1f2b55a DA |
164 | break; |
165 | } | |
166 | } | |
c153f45f | 167 | if (request->handle == NULL) |
d1f2b55a DA |
168 | return -EINVAL; |
169 | ||
1da177e4 LT |
170 | return 0; |
171 | } | |
172 | ||
173 | /** | |
174 | * Set per-context SAREA. | |
b5e89ed5 | 175 | * |
1da177e4 | 176 | * \param inode device inode. |
6c340eac | 177 | * \param file_priv DRM file private. |
1da177e4 LT |
178 | * \param cmd command. |
179 | * \param arg user argument pointing to a drm_ctx_priv_map structure. | |
180 | * \return zero on success or a negative number on failure. | |
181 | * | |
182 | * Searches the mapping specified in \p arg and update the entry in | |
62968144 | 183 | * drm_device::ctx_idr with it. |
1da177e4 | 184 | */ |
c153f45f EA |
185 | int drm_setsareactx(struct drm_device *dev, void *data, |
186 | struct drm_file *file_priv) | |
1da177e4 | 187 | { |
c153f45f | 188 | struct drm_ctx_priv_map *request = data; |
c60ce623 | 189 | struct drm_map *map = NULL; |
55910517 | 190 | struct drm_map_list *r_list = NULL; |
1da177e4 | 191 | |
30e2fb18 | 192 | mutex_lock(&dev->struct_mutex); |
bd1b331f | 193 | list_for_each_entry(r_list, &dev->maplist, head) { |
9a186645 | 194 | if (r_list->map |
c153f45f | 195 | && r_list->user_token == (unsigned long) request->handle) |
1da177e4 LT |
196 | goto found; |
197 | } | |
b5e89ed5 | 198 | bad: |
30e2fb18 | 199 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
200 | return -EINVAL; |
201 | ||
b5e89ed5 | 202 | found: |
1da177e4 | 203 | map = r_list->map; |
b5e89ed5 DA |
204 | if (!map) |
205 | goto bad; | |
62968144 | 206 | |
c153f45f | 207 | if (IS_ERR(idr_replace(&dev->ctx_idr, map, request->ctx_id))) |
1da177e4 | 208 | goto bad; |
62968144 | 209 | |
30e2fb18 | 210 | mutex_unlock(&dev->struct_mutex); |
c153f45f | 211 | |
1da177e4 LT |
212 | return 0; |
213 | } | |
214 | ||
215 | /*@}*/ | |
216 | ||
217 | /******************************************************************/ | |
218 | /** \name The actual DRM context handling routines */ | |
219 | /*@{*/ | |
220 | ||
221 | /** | |
222 | * Switch context. | |
223 | * | |
224 | * \param dev DRM device. | |
225 | * \param old old context handle. | |
226 | * \param new new context handle. | |
227 | * \return zero on success or a negative number on failure. | |
228 | * | |
229 | * Attempt to set drm_device::context_flag. | |
230 | */ | |
84b1fd10 | 231 | static int drm_context_switch(struct drm_device * dev, int old, int new) |
1da177e4 | 232 | { |
b5e89ed5 DA |
233 | if (test_and_set_bit(0, &dev->context_flag)) { |
234 | DRM_ERROR("Reentering -- FIXME\n"); | |
235 | return -EBUSY; | |
236 | } | |
1da177e4 | 237 | |
b5e89ed5 | 238 | DRM_DEBUG("Context switch from %d to %d\n", old, new); |
1da177e4 | 239 | |
b5e89ed5 DA |
240 | if (new == dev->last_context) { |
241 | clear_bit(0, &dev->context_flag); | |
242 | return 0; | |
243 | } | |
1da177e4 | 244 | |
b5e89ed5 | 245 | return 0; |
1da177e4 LT |
246 | } |
247 | ||
248 | /** | |
249 | * Complete context switch. | |
250 | * | |
251 | * \param dev DRM device. | |
252 | * \param new new context handle. | |
253 | * \return zero on success or a negative number on failure. | |
254 | * | |
255 | * Updates drm_device::last_context and drm_device::last_switch. Verifies the | |
256 | * hardware lock is held, clears the drm_device::context_flag and wakes up | |
257 | * drm_device::context_wait. | |
258 | */ | |
84b1fd10 | 259 | static int drm_context_switch_complete(struct drm_device * dev, int new) |
1da177e4 | 260 | { |
b5e89ed5 DA |
261 | dev->last_context = new; /* PRE/POST: This is the _only_ writer. */ |
262 | dev->last_switch = jiffies; | |
1da177e4 | 263 | |
b5e89ed5 DA |
264 | if (!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) { |
265 | DRM_ERROR("Lock isn't held after context switch\n"); | |
266 | } | |
1da177e4 | 267 | |
b5e89ed5 DA |
268 | /* If a context switch is ever initiated |
269 | when the kernel holds the lock, release | |
270 | that lock here. */ | |
271 | clear_bit(0, &dev->context_flag); | |
272 | wake_up(&dev->context_wait); | |
1da177e4 | 273 | |
b5e89ed5 | 274 | return 0; |
1da177e4 LT |
275 | } |
276 | ||
277 | /** | |
278 | * Reserve contexts. | |
279 | * | |
280 | * \param inode device inode. | |
6c340eac | 281 | * \param file_priv DRM file private. |
1da177e4 LT |
282 | * \param cmd command. |
283 | * \param arg user argument pointing to a drm_ctx_res structure. | |
284 | * \return zero on success or a negative number on failure. | |
285 | */ | |
c153f45f EA |
286 | int drm_resctx(struct drm_device *dev, void *data, |
287 | struct drm_file *file_priv) | |
1da177e4 | 288 | { |
c153f45f | 289 | struct drm_ctx_res *res = data; |
c60ce623 | 290 | struct drm_ctx ctx; |
1da177e4 LT |
291 | int i; |
292 | ||
c153f45f | 293 | if (res->count >= DRM_RESERVED_CONTEXTS) { |
b5e89ed5 DA |
294 | memset(&ctx, 0, sizeof(ctx)); |
295 | for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) { | |
1da177e4 | 296 | ctx.handle = i; |
c153f45f | 297 | if (copy_to_user(&res->contexts[i], &ctx, sizeof(ctx))) |
1da177e4 LT |
298 | return -EFAULT; |
299 | } | |
300 | } | |
c153f45f | 301 | res->count = DRM_RESERVED_CONTEXTS; |
1da177e4 | 302 | |
1da177e4 LT |
303 | return 0; |
304 | } | |
305 | ||
306 | /** | |
307 | * Add context. | |
308 | * | |
309 | * \param inode device inode. | |
6c340eac | 310 | * \param file_priv DRM file private. |
1da177e4 LT |
311 | * \param cmd command. |
312 | * \param arg user argument pointing to a drm_ctx structure. | |
313 | * \return zero on success or a negative number on failure. | |
314 | * | |
315 | * Get a new handle for the context and copy to userspace. | |
316 | */ | |
c153f45f EA |
317 | int drm_addctx(struct drm_device *dev, void *data, |
318 | struct drm_file *file_priv) | |
1da177e4 | 319 | { |
55910517 | 320 | struct drm_ctx_list *ctx_entry; |
c153f45f | 321 | struct drm_ctx *ctx = data; |
1da177e4 | 322 | |
c153f45f EA |
323 | ctx->handle = drm_ctxbitmap_next(dev); |
324 | if (ctx->handle == DRM_KERNEL_CONTEXT) { | |
b5e89ed5 | 325 | /* Skip kernel's context and get a new one. */ |
c153f45f | 326 | ctx->handle = drm_ctxbitmap_next(dev); |
1da177e4 | 327 | } |
c153f45f EA |
328 | DRM_DEBUG("%d\n", ctx->handle); |
329 | if (ctx->handle == -1) { | |
b5e89ed5 DA |
330 | DRM_DEBUG("Not enough free contexts.\n"); |
331 | /* Should this return -EBUSY instead? */ | |
1da177e4 LT |
332 | return -ENOMEM; |
333 | } | |
334 | ||
c153f45f | 335 | if (ctx->handle != DRM_KERNEL_CONTEXT) { |
1da177e4 | 336 | if (dev->driver->context_ctor) |
c153f45f | 337 | if (!dev->driver->context_ctor(dev, ctx->handle)) { |
b5e9fc13 DA |
338 | DRM_DEBUG("Running out of ctxs or memory.\n"); |
339 | return -ENOMEM; | |
340 | } | |
1da177e4 LT |
341 | } |
342 | ||
b5e89ed5 DA |
343 | ctx_entry = drm_alloc(sizeof(*ctx_entry), DRM_MEM_CTXLIST); |
344 | if (!ctx_entry) { | |
1da177e4 LT |
345 | DRM_DEBUG("out of memory\n"); |
346 | return -ENOMEM; | |
347 | } | |
348 | ||
b5e89ed5 | 349 | INIT_LIST_HEAD(&ctx_entry->head); |
c153f45f | 350 | ctx_entry->handle = ctx->handle; |
6c340eac | 351 | ctx_entry->tag = file_priv; |
1da177e4 | 352 | |
30e2fb18 | 353 | mutex_lock(&dev->ctxlist_mutex); |
bd1b331f | 354 | list_add(&ctx_entry->head, &dev->ctxlist); |
1da177e4 | 355 | ++dev->ctx_count; |
30e2fb18 | 356 | mutex_unlock(&dev->ctxlist_mutex); |
1da177e4 | 357 | |
1da177e4 LT |
358 | return 0; |
359 | } | |
360 | ||
c153f45f | 361 | int drm_modctx(struct drm_device *dev, void *data, struct drm_file *file_priv) |
1da177e4 LT |
362 | { |
363 | /* This does nothing */ | |
364 | return 0; | |
365 | } | |
366 | ||
367 | /** | |
368 | * Get context. | |
369 | * | |
370 | * \param inode device inode. | |
6c340eac | 371 | * \param file_priv DRM file private. |
1da177e4 LT |
372 | * \param cmd command. |
373 | * \param arg user argument pointing to a drm_ctx structure. | |
374 | * \return zero on success or a negative number on failure. | |
375 | */ | |
c153f45f | 376 | int drm_getctx(struct drm_device *dev, void *data, struct drm_file *file_priv) |
1da177e4 | 377 | { |
c153f45f | 378 | struct drm_ctx *ctx = data; |
1da177e4 LT |
379 | |
380 | /* This is 0, because we don't handle any context flags */ | |
c153f45f | 381 | ctx->flags = 0; |
1da177e4 | 382 | |
1da177e4 LT |
383 | return 0; |
384 | } | |
385 | ||
386 | /** | |
387 | * Switch context. | |
388 | * | |
389 | * \param inode device inode. | |
6c340eac | 390 | * \param file_priv DRM file private. |
1da177e4 LT |
391 | * \param cmd command. |
392 | * \param arg user argument pointing to a drm_ctx structure. | |
393 | * \return zero on success or a negative number on failure. | |
394 | * | |
395 | * Calls context_switch(). | |
396 | */ | |
c153f45f EA |
397 | int drm_switchctx(struct drm_device *dev, void *data, |
398 | struct drm_file *file_priv) | |
1da177e4 | 399 | { |
c153f45f | 400 | struct drm_ctx *ctx = data; |
1da177e4 | 401 | |
c153f45f EA |
402 | DRM_DEBUG("%d\n", ctx->handle); |
403 | return drm_context_switch(dev, dev->last_context, ctx->handle); | |
1da177e4 LT |
404 | } |
405 | ||
406 | /** | |
407 | * New context. | |
408 | * | |
409 | * \param inode device inode. | |
6c340eac | 410 | * \param file_priv DRM file private. |
1da177e4 LT |
411 | * \param cmd command. |
412 | * \param arg user argument pointing to a drm_ctx structure. | |
413 | * \return zero on success or a negative number on failure. | |
414 | * | |
415 | * Calls context_switch_complete(). | |
416 | */ | |
c153f45f EA |
417 | int drm_newctx(struct drm_device *dev, void *data, |
418 | struct drm_file *file_priv) | |
1da177e4 | 419 | { |
c153f45f | 420 | struct drm_ctx *ctx = data; |
1da177e4 | 421 | |
c153f45f EA |
422 | DRM_DEBUG("%d\n", ctx->handle); |
423 | drm_context_switch_complete(dev, ctx->handle); | |
1da177e4 LT |
424 | |
425 | return 0; | |
426 | } | |
427 | ||
428 | /** | |
429 | * Remove context. | |
430 | * | |
431 | * \param inode device inode. | |
6c340eac | 432 | * \param file_priv DRM file private. |
1da177e4 LT |
433 | * \param cmd command. |
434 | * \param arg user argument pointing to a drm_ctx structure. | |
435 | * \return zero on success or a negative number on failure. | |
436 | * | |
437 | * If not the special kernel context, calls ctxbitmap_free() to free the specified context. | |
438 | */ | |
c153f45f EA |
439 | int drm_rmctx(struct drm_device *dev, void *data, |
440 | struct drm_file *file_priv) | |
1da177e4 | 441 | { |
c153f45f | 442 | struct drm_ctx *ctx = data; |
1da177e4 | 443 | |
c153f45f EA |
444 | DRM_DEBUG("%d\n", ctx->handle); |
445 | if (ctx->handle == DRM_KERNEL_CONTEXT + 1) { | |
6c340eac | 446 | file_priv->remove_auth_on_close = 1; |
1da177e4 | 447 | } |
c153f45f | 448 | if (ctx->handle != DRM_KERNEL_CONTEXT) { |
1da177e4 | 449 | if (dev->driver->context_dtor) |
c153f45f EA |
450 | dev->driver->context_dtor(dev, ctx->handle); |
451 | drm_ctxbitmap_free(dev, ctx->handle); | |
1da177e4 LT |
452 | } |
453 | ||
30e2fb18 | 454 | mutex_lock(&dev->ctxlist_mutex); |
bd1b331f | 455 | if (!list_empty(&dev->ctxlist)) { |
55910517 | 456 | struct drm_ctx_list *pos, *n; |
1da177e4 | 457 | |
bd1b331f | 458 | list_for_each_entry_safe(pos, n, &dev->ctxlist, head) { |
c153f45f | 459 | if (pos->handle == ctx->handle) { |
b5e89ed5 DA |
460 | list_del(&pos->head); |
461 | drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST); | |
1da177e4 LT |
462 | --dev->ctx_count; |
463 | } | |
464 | } | |
465 | } | |
30e2fb18 | 466 | mutex_unlock(&dev->ctxlist_mutex); |
1da177e4 LT |
467 | |
468 | return 0; | |
469 | } | |
470 | ||
471 | /*@}*/ |