Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
e7b96070 | 2 | * Legacy: Generic DRM Contexts |
1da177e4 LT |
3 | * |
4 | * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. | |
5 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
6 | * All Rights Reserved. | |
7 | * | |
e7b96070 DH |
8 | * Author: Rickard E. (Rik) Faith <faith@valinux.com> |
9 | * Author: Gareth Hughes <gareth@valinux.com> | |
10 | * | |
1da177e4 LT |
11 | * Permission is hereby granted, free of charge, to any person obtaining a |
12 | * copy of this software and associated documentation files (the "Software"), | |
13 | * to deal in the Software without restriction, including without limitation | |
14 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
15 | * and/or sell copies of the Software, and to permit persons to whom the | |
16 | * Software is furnished to do so, subject to the following conditions: | |
17 | * | |
18 | * The above copyright notice and this permission notice (including the next | |
19 | * paragraph) shall be included in all copies or substantial portions of the | |
20 | * Software. | |
21 | * | |
22 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
23 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
24 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
25 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
26 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
27 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
28 | * OTHER DEALINGS IN THE SOFTWARE. | |
29 | */ | |
30 | ||
760285e7 | 31 | #include <drm/drmP.h> |
e7b96070 DH |
32 | #include "drm_legacy.h" |
33 | ||
34 | struct drm_ctx_list { | |
35 | struct list_head head; | |
36 | drm_context_t handle; | |
37 | struct drm_file *tag; | |
38 | }; | |
1da177e4 | 39 | |
c21eb21c DA |
40 | /******************************************************************/ |
41 | /** \name Context bitmap support */ | |
42 | /*@{*/ | |
43 | ||
1da177e4 LT |
44 | /** |
45 | * Free a handle from the context bitmap. | |
46 | * | |
47 | * \param dev DRM device. | |
48 | * \param ctx_handle context handle. | |
49 | * | |
50 | * Clears the bit specified by \p ctx_handle in drm_device::ctx_bitmap and the entry | |
62968144 | 51 | * in drm_device::ctx_idr, while holding the drm_device::struct_mutex |
1da177e4 LT |
52 | * lock. |
53 | */ | |
e7b96070 | 54 | void drm_legacy_ctxbitmap_free(struct drm_device * dev, int ctx_handle) |
1da177e4 | 55 | { |
62968144 DA |
56 | mutex_lock(&dev->struct_mutex); |
57 | idr_remove(&dev->ctx_idr, ctx_handle); | |
58 | mutex_unlock(&dev->struct_mutex); | |
1da177e4 LT |
59 | } |
60 | ||
b5e89ed5 | 61 | /** |
1da177e4 LT |
62 | * Context bitmap allocation. |
63 | * | |
64 | * \param dev DRM device. | |
65 | * \return (non-negative) context handle on success or a negative number on failure. | |
66 | * | |
62968144 | 67 | * Allocate a new idr from drm_device::ctx_idr while holding the |
30e2fb18 | 68 | * drm_device::struct_mutex lock. |
1da177e4 | 69 | */ |
e7b96070 | 70 | static int drm_legacy_ctxbitmap_next(struct drm_device * dev) |
1da177e4 | 71 | { |
62968144 | 72 | int ret; |
1da177e4 | 73 | |
30e2fb18 | 74 | mutex_lock(&dev->struct_mutex); |
2e928815 TH |
75 | ret = idr_alloc(&dev->ctx_idr, NULL, DRM_RESERVED_CONTEXTS, 0, |
76 | GFP_KERNEL); | |
30e2fb18 | 77 | mutex_unlock(&dev->struct_mutex); |
2e928815 | 78 | return ret; |
1da177e4 LT |
79 | } |
80 | ||
81 | /** | |
82 | * Context bitmap initialization. | |
83 | * | |
84 | * \param dev DRM device. | |
85 | * | |
62968144 | 86 | * Initialise the drm_device::ctx_idr |
1da177e4 | 87 | */ |
e7b96070 | 88 | int drm_legacy_ctxbitmap_init(struct drm_device * dev) |
1da177e4 | 89 | { |
62968144 | 90 | idr_init(&dev->ctx_idr); |
c21eb21c | 91 | return 0; |
1da177e4 LT |
92 | } |
93 | ||
94 | /** | |
95 | * Context bitmap cleanup. | |
96 | * | |
97 | * \param dev DRM device. | |
98 | * | |
62968144 DA |
99 | * Free all idr members using drm_ctx_sarea_free helper function |
100 | * while holding the drm_device::struct_mutex lock. | |
1da177e4 | 101 | */ |
e7b96070 | 102 | void drm_legacy_ctxbitmap_cleanup(struct drm_device * dev) |
1da177e4 | 103 | { |
30e2fb18 | 104 | mutex_lock(&dev->struct_mutex); |
4d53233a | 105 | idr_destroy(&dev->ctx_idr); |
30e2fb18 | 106 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
107 | } |
108 | ||
9f8d21ea DH |
109 | /** |
110 | * drm_ctxbitmap_flush() - Flush all contexts owned by a file | |
111 | * @dev: DRM device to operate on | |
112 | * @file: Open file to flush contexts for | |
113 | * | |
114 | * This iterates over all contexts on @dev and drops them if they're owned by | |
115 | * @file. Note that after this call returns, new contexts might be added if | |
116 | * the file is still alive. | |
117 | */ | |
e7b96070 | 118 | void drm_legacy_ctxbitmap_flush(struct drm_device *dev, struct drm_file *file) |
9f8d21ea DH |
119 | { |
120 | struct drm_ctx_list *pos, *tmp; | |
121 | ||
122 | mutex_lock(&dev->ctxlist_mutex); | |
123 | ||
124 | list_for_each_entry_safe(pos, tmp, &dev->ctxlist, head) { | |
125 | if (pos->tag == file && | |
126 | pos->handle != DRM_KERNEL_CONTEXT) { | |
127 | if (dev->driver->context_dtor) | |
128 | dev->driver->context_dtor(dev, pos->handle); | |
129 | ||
e7b96070 | 130 | drm_legacy_ctxbitmap_free(dev, pos->handle); |
9f8d21ea DH |
131 | list_del(&pos->head); |
132 | kfree(pos); | |
133 | } | |
134 | } | |
135 | ||
136 | mutex_unlock(&dev->ctxlist_mutex); | |
137 | } | |
138 | ||
1da177e4 LT |
139 | /*@}*/ |
140 | ||
141 | /******************************************************************/ | |
142 | /** \name Per Context SAREA Support */ | |
143 | /*@{*/ | |
144 | ||
145 | /** | |
146 | * Get per-context SAREA. | |
b5e89ed5 | 147 | * |
1da177e4 | 148 | * \param inode device inode. |
6c340eac | 149 | * \param file_priv DRM file private. |
1da177e4 LT |
150 | * \param cmd command. |
151 | * \param arg user argument pointing to a drm_ctx_priv_map structure. | |
152 | * \return zero on success or a negative number on failure. | |
153 | * | |
62968144 | 154 | * Gets the map from drm_device::ctx_idr with the handle specified and |
1da177e4 LT |
155 | * returns its handle. |
156 | */ | |
e7b96070 DH |
157 | int drm_legacy_getsareactx(struct drm_device *dev, void *data, |
158 | struct drm_file *file_priv) | |
1da177e4 | 159 | { |
c153f45f | 160 | struct drm_ctx_priv_map *request = data; |
f77d390c | 161 | struct drm_local_map *map; |
55910517 | 162 | struct drm_map_list *_entry; |
1da177e4 | 163 | |
30e2fb18 | 164 | mutex_lock(&dev->struct_mutex); |
62968144 | 165 | |
c153f45f | 166 | map = idr_find(&dev->ctx_idr, request->ctx_id); |
62968144 | 167 | if (!map) { |
30e2fb18 | 168 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
169 | return -EINVAL; |
170 | } | |
171 | ||
c153f45f | 172 | request->handle = NULL; |
bd1b331f | 173 | list_for_each_entry(_entry, &dev->maplist, head) { |
d1f2b55a | 174 | if (_entry->map == map) { |
bc5f4523 | 175 | request->handle = |
b5e89ed5 | 176 | (void *)(unsigned long)_entry->user_token; |
d1f2b55a DA |
177 | break; |
178 | } | |
179 | } | |
09b4ea47 IH |
180 | |
181 | mutex_unlock(&dev->struct_mutex); | |
182 | ||
c153f45f | 183 | if (request->handle == NULL) |
d1f2b55a DA |
184 | return -EINVAL; |
185 | ||
1da177e4 LT |
186 | return 0; |
187 | } | |
188 | ||
189 | /** | |
190 | * Set per-context SAREA. | |
b5e89ed5 | 191 | * |
1da177e4 | 192 | * \param inode device inode. |
6c340eac | 193 | * \param file_priv DRM file private. |
1da177e4 LT |
194 | * \param cmd command. |
195 | * \param arg user argument pointing to a drm_ctx_priv_map structure. | |
196 | * \return zero on success or a negative number on failure. | |
197 | * | |
198 | * Searches the mapping specified in \p arg and update the entry in | |
62968144 | 199 | * drm_device::ctx_idr with it. |
1da177e4 | 200 | */ |
e7b96070 DH |
201 | int drm_legacy_setsareactx(struct drm_device *dev, void *data, |
202 | struct drm_file *file_priv) | |
1da177e4 | 203 | { |
c153f45f | 204 | struct drm_ctx_priv_map *request = data; |
f77d390c | 205 | struct drm_local_map *map = NULL; |
55910517 | 206 | struct drm_map_list *r_list = NULL; |
1da177e4 | 207 | |
30e2fb18 | 208 | mutex_lock(&dev->struct_mutex); |
bd1b331f | 209 | list_for_each_entry(r_list, &dev->maplist, head) { |
9a186645 | 210 | if (r_list->map |
c153f45f | 211 | && r_list->user_token == (unsigned long) request->handle) |
1da177e4 LT |
212 | goto found; |
213 | } | |
b5e89ed5 | 214 | bad: |
30e2fb18 | 215 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
216 | return -EINVAL; |
217 | ||
b5e89ed5 | 218 | found: |
1da177e4 | 219 | map = r_list->map; |
b5e89ed5 DA |
220 | if (!map) |
221 | goto bad; | |
62968144 | 222 | |
c153f45f | 223 | if (IS_ERR(idr_replace(&dev->ctx_idr, map, request->ctx_id))) |
1da177e4 | 224 | goto bad; |
62968144 | 225 | |
30e2fb18 | 226 | mutex_unlock(&dev->struct_mutex); |
c153f45f | 227 | |
1da177e4 LT |
228 | return 0; |
229 | } | |
230 | ||
231 | /*@}*/ | |
232 | ||
233 | /******************************************************************/ | |
234 | /** \name The actual DRM context handling routines */ | |
235 | /*@{*/ | |
236 | ||
237 | /** | |
238 | * Switch context. | |
239 | * | |
240 | * \param dev DRM device. | |
241 | * \param old old context handle. | |
242 | * \param new new context handle. | |
243 | * \return zero on success or a negative number on failure. | |
244 | * | |
245 | * Attempt to set drm_device::context_flag. | |
246 | */ | |
84b1fd10 | 247 | static int drm_context_switch(struct drm_device * dev, int old, int new) |
1da177e4 | 248 | { |
b5e89ed5 DA |
249 | if (test_and_set_bit(0, &dev->context_flag)) { |
250 | DRM_ERROR("Reentering -- FIXME\n"); | |
251 | return -EBUSY; | |
252 | } | |
1da177e4 | 253 | |
b5e89ed5 | 254 | DRM_DEBUG("Context switch from %d to %d\n", old, new); |
1da177e4 | 255 | |
b5e89ed5 DA |
256 | if (new == dev->last_context) { |
257 | clear_bit(0, &dev->context_flag); | |
258 | return 0; | |
259 | } | |
1da177e4 | 260 | |
b5e89ed5 | 261 | return 0; |
1da177e4 LT |
262 | } |
263 | ||
264 | /** | |
265 | * Complete context switch. | |
266 | * | |
267 | * \param dev DRM device. | |
268 | * \param new new context handle. | |
269 | * \return zero on success or a negative number on failure. | |
270 | * | |
271 | * Updates drm_device::last_context and drm_device::last_switch. Verifies the | |
272 | * hardware lock is held, clears the drm_device::context_flag and wakes up | |
273 | * drm_device::context_wait. | |
274 | */ | |
7c1c2871 DA |
275 | static int drm_context_switch_complete(struct drm_device *dev, |
276 | struct drm_file *file_priv, int new) | |
1da177e4 | 277 | { |
b5e89ed5 | 278 | dev->last_context = new; /* PRE/POST: This is the _only_ writer. */ |
1da177e4 | 279 | |
7c1c2871 | 280 | if (!_DRM_LOCK_IS_HELD(file_priv->master->lock.hw_lock->lock)) { |
b5e89ed5 DA |
281 | DRM_ERROR("Lock isn't held after context switch\n"); |
282 | } | |
1da177e4 | 283 | |
b5e89ed5 DA |
284 | /* If a context switch is ever initiated |
285 | when the kernel holds the lock, release | |
286 | that lock here. */ | |
287 | clear_bit(0, &dev->context_flag); | |
1da177e4 | 288 | |
b5e89ed5 | 289 | return 0; |
1da177e4 LT |
290 | } |
291 | ||
292 | /** | |
293 | * Reserve contexts. | |
294 | * | |
295 | * \param inode device inode. | |
6c340eac | 296 | * \param file_priv DRM file private. |
1da177e4 LT |
297 | * \param cmd command. |
298 | * \param arg user argument pointing to a drm_ctx_res structure. | |
299 | * \return zero on success or a negative number on failure. | |
300 | */ | |
e7b96070 DH |
301 | int drm_legacy_resctx(struct drm_device *dev, void *data, |
302 | struct drm_file *file_priv) | |
1da177e4 | 303 | { |
c153f45f | 304 | struct drm_ctx_res *res = data; |
c60ce623 | 305 | struct drm_ctx ctx; |
1da177e4 LT |
306 | int i; |
307 | ||
c153f45f | 308 | if (res->count >= DRM_RESERVED_CONTEXTS) { |
b5e89ed5 DA |
309 | memset(&ctx, 0, sizeof(ctx)); |
310 | for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) { | |
1da177e4 | 311 | ctx.handle = i; |
c153f45f | 312 | if (copy_to_user(&res->contexts[i], &ctx, sizeof(ctx))) |
1da177e4 LT |
313 | return -EFAULT; |
314 | } | |
315 | } | |
c153f45f | 316 | res->count = DRM_RESERVED_CONTEXTS; |
1da177e4 | 317 | |
1da177e4 LT |
318 | return 0; |
319 | } | |
320 | ||
321 | /** | |
322 | * Add context. | |
323 | * | |
324 | * \param inode device inode. | |
6c340eac | 325 | * \param file_priv DRM file private. |
1da177e4 LT |
326 | * \param cmd command. |
327 | * \param arg user argument pointing to a drm_ctx structure. | |
328 | * \return zero on success or a negative number on failure. | |
329 | * | |
330 | * Get a new handle for the context and copy to userspace. | |
331 | */ | |
e7b96070 DH |
332 | int drm_legacy_addctx(struct drm_device *dev, void *data, |
333 | struct drm_file *file_priv) | |
1da177e4 | 334 | { |
55910517 | 335 | struct drm_ctx_list *ctx_entry; |
c153f45f | 336 | struct drm_ctx *ctx = data; |
1da177e4 | 337 | |
e7b96070 | 338 | ctx->handle = drm_legacy_ctxbitmap_next(dev); |
c153f45f | 339 | if (ctx->handle == DRM_KERNEL_CONTEXT) { |
b5e89ed5 | 340 | /* Skip kernel's context and get a new one. */ |
e7b96070 | 341 | ctx->handle = drm_legacy_ctxbitmap_next(dev); |
1da177e4 | 342 | } |
c153f45f EA |
343 | DRM_DEBUG("%d\n", ctx->handle); |
344 | if (ctx->handle == -1) { | |
b5e89ed5 DA |
345 | DRM_DEBUG("Not enough free contexts.\n"); |
346 | /* Should this return -EBUSY instead? */ | |
1da177e4 LT |
347 | return -ENOMEM; |
348 | } | |
349 | ||
9a298b2a | 350 | ctx_entry = kmalloc(sizeof(*ctx_entry), GFP_KERNEL); |
b5e89ed5 | 351 | if (!ctx_entry) { |
1da177e4 LT |
352 | DRM_DEBUG("out of memory\n"); |
353 | return -ENOMEM; | |
354 | } | |
355 | ||
b5e89ed5 | 356 | INIT_LIST_HEAD(&ctx_entry->head); |
c153f45f | 357 | ctx_entry->handle = ctx->handle; |
6c340eac | 358 | ctx_entry->tag = file_priv; |
1da177e4 | 359 | |
30e2fb18 | 360 | mutex_lock(&dev->ctxlist_mutex); |
bd1b331f | 361 | list_add(&ctx_entry->head, &dev->ctxlist); |
30e2fb18 | 362 | mutex_unlock(&dev->ctxlist_mutex); |
1da177e4 | 363 | |
1da177e4 LT |
364 | return 0; |
365 | } | |
366 | ||
1da177e4 LT |
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 | */ | |
e7b96070 DH |
376 | int drm_legacy_getctx(struct drm_device *dev, void *data, |
377 | struct drm_file *file_priv) | |
1da177e4 | 378 | { |
c153f45f | 379 | struct drm_ctx *ctx = data; |
1da177e4 LT |
380 | |
381 | /* This is 0, because we don't handle any context flags */ | |
c153f45f | 382 | ctx->flags = 0; |
1da177e4 | 383 | |
1da177e4 LT |
384 | return 0; |
385 | } | |
386 | ||
387 | /** | |
388 | * Switch context. | |
389 | * | |
390 | * \param inode device inode. | |
6c340eac | 391 | * \param file_priv DRM file private. |
1da177e4 LT |
392 | * \param cmd command. |
393 | * \param arg user argument pointing to a drm_ctx structure. | |
394 | * \return zero on success or a negative number on failure. | |
395 | * | |
396 | * Calls context_switch(). | |
397 | */ | |
e7b96070 DH |
398 | int drm_legacy_switchctx(struct drm_device *dev, void *data, |
399 | struct drm_file *file_priv) | |
1da177e4 | 400 | { |
c153f45f | 401 | struct drm_ctx *ctx = data; |
1da177e4 | 402 | |
c153f45f EA |
403 | DRM_DEBUG("%d\n", ctx->handle); |
404 | return drm_context_switch(dev, dev->last_context, ctx->handle); | |
1da177e4 LT |
405 | } |
406 | ||
407 | /** | |
408 | * New context. | |
409 | * | |
410 | * \param inode device inode. | |
6c340eac | 411 | * \param file_priv DRM file private. |
1da177e4 LT |
412 | * \param cmd command. |
413 | * \param arg user argument pointing to a drm_ctx structure. | |
414 | * \return zero on success or a negative number on failure. | |
415 | * | |
416 | * Calls context_switch_complete(). | |
417 | */ | |
e7b96070 DH |
418 | int drm_legacy_newctx(struct drm_device *dev, void *data, |
419 | struct drm_file *file_priv) | |
1da177e4 | 420 | { |
c153f45f | 421 | struct drm_ctx *ctx = data; |
1da177e4 | 422 | |
c153f45f | 423 | DRM_DEBUG("%d\n", ctx->handle); |
7c1c2871 | 424 | drm_context_switch_complete(dev, file_priv, ctx->handle); |
1da177e4 LT |
425 | |
426 | return 0; | |
427 | } | |
428 | ||
429 | /** | |
430 | * Remove context. | |
431 | * | |
432 | * \param inode device inode. | |
6c340eac | 433 | * \param file_priv DRM file private. |
1da177e4 LT |
434 | * \param cmd command. |
435 | * \param arg user argument pointing to a drm_ctx structure. | |
436 | * \return zero on success or a negative number on failure. | |
437 | * | |
438 | * If not the special kernel context, calls ctxbitmap_free() to free the specified context. | |
439 | */ | |
e7b96070 DH |
440 | int drm_legacy_rmctx(struct drm_device *dev, void *data, |
441 | struct drm_file *file_priv) | |
1da177e4 | 442 | { |
c153f45f | 443 | struct drm_ctx *ctx = data; |
1da177e4 | 444 | |
c153f45f | 445 | DRM_DEBUG("%d\n", ctx->handle); |
c153f45f | 446 | if (ctx->handle != DRM_KERNEL_CONTEXT) { |
1da177e4 | 447 | if (dev->driver->context_dtor) |
c153f45f | 448 | dev->driver->context_dtor(dev, ctx->handle); |
e7b96070 | 449 | drm_legacy_ctxbitmap_free(dev, ctx->handle); |
1da177e4 LT |
450 | } |
451 | ||
30e2fb18 | 452 | mutex_lock(&dev->ctxlist_mutex); |
bd1b331f | 453 | if (!list_empty(&dev->ctxlist)) { |
55910517 | 454 | struct drm_ctx_list *pos, *n; |
1da177e4 | 455 | |
bd1b331f | 456 | list_for_each_entry_safe(pos, n, &dev->ctxlist, head) { |
c153f45f | 457 | if (pos->handle == ctx->handle) { |
b5e89ed5 | 458 | list_del(&pos->head); |
9a298b2a | 459 | kfree(pos); |
1da177e4 LT |
460 | } |
461 | } | |
462 | } | |
30e2fb18 | 463 | mutex_unlock(&dev->ctxlist_mutex); |
1da177e4 LT |
464 | |
465 | return 0; | |
466 | } | |
467 | ||
468 | /*@}*/ |