ASoC: tlv312aic23: unbreak resume
[zen-stable.git] / drivers / gpu / drm / drm_context.c
blob325365f6d355c3c12bf2386bb354bd095d873061
1 /**
2 * \file drm_context.c
3 * IOCTLs for generic contexts
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 */
9 /*
10 * Created: Fri Nov 24 18:31:37 2000 by gareth@valinux.com
12 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
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:
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.
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.
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.
43 #include "drmP.h"
45 /******************************************************************/
46 /** \name Context bitmap support */
47 /*@{*/
49 /**
50 * Free a handle from the context bitmap.
52 * \param dev DRM device.
53 * \param ctx_handle context handle.
55 * Clears the bit specified by \p ctx_handle in drm_device::ctx_bitmap and the entry
56 * in drm_device::ctx_idr, while holding the drm_device::struct_mutex
57 * lock.
59 void drm_ctxbitmap_free(struct drm_device * dev, int ctx_handle)
61 mutex_lock(&dev->struct_mutex);
62 idr_remove(&dev->ctx_idr, ctx_handle);
63 mutex_unlock(&dev->struct_mutex);
66 /**
67 * Context bitmap allocation.
69 * \param dev DRM device.
70 * \return (non-negative) context handle on success or a negative number on failure.
72 * Allocate a new idr from drm_device::ctx_idr while holding the
73 * drm_device::struct_mutex lock.
75 static int drm_ctxbitmap_next(struct drm_device * dev)
77 int new_id;
78 int ret;
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;
85 mutex_lock(&dev->struct_mutex);
86 ret = idr_get_new_above(&dev->ctx_idr, NULL,
87 DRM_RESERVED_CONTEXTS, &new_id);
88 if (ret == -EAGAIN) {
89 mutex_unlock(&dev->struct_mutex);
90 goto again;
92 mutex_unlock(&dev->struct_mutex);
93 return new_id;
96 /**
97 * Context bitmap initialization.
99 * \param dev DRM device.
101 * Initialise the drm_device::ctx_idr
103 int drm_ctxbitmap_init(struct drm_device * dev)
105 idr_init(&dev->ctx_idr);
106 return 0;
110 * Context bitmap cleanup.
112 * \param dev DRM device.
114 * Free all idr members using drm_ctx_sarea_free helper function
115 * while holding the drm_device::struct_mutex lock.
117 void drm_ctxbitmap_cleanup(struct drm_device * dev)
119 mutex_lock(&dev->struct_mutex);
120 idr_remove_all(&dev->ctx_idr);
121 mutex_unlock(&dev->struct_mutex);
124 /*@}*/
126 /******************************************************************/
127 /** \name Per Context SAREA Support */
128 /*@{*/
131 * Get per-context SAREA.
133 * \param inode device inode.
134 * \param file_priv DRM file private.
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.
139 * Gets the map from drm_device::ctx_idr with the handle specified and
140 * returns its handle.
142 int drm_getsareactx(struct drm_device *dev, void *data,
143 struct drm_file *file_priv)
145 struct drm_ctx_priv_map *request = data;
146 struct drm_local_map *map;
147 struct drm_map_list *_entry;
149 mutex_lock(&dev->struct_mutex);
151 map = idr_find(&dev->ctx_idr, request->ctx_id);
152 if (!map) {
153 mutex_unlock(&dev->struct_mutex);
154 return -EINVAL;
157 request->handle = NULL;
158 list_for_each_entry(_entry, &dev->maplist, head) {
159 if (_entry->map == map) {
160 request->handle =
161 (void *)(unsigned long)_entry->user_token;
162 break;
166 mutex_unlock(&dev->struct_mutex);
168 if (request->handle == NULL)
169 return -EINVAL;
171 return 0;
175 * Set per-context SAREA.
177 * \param inode device inode.
178 * \param file_priv DRM file private.
179 * \param cmd command.
180 * \param arg user argument pointing to a drm_ctx_priv_map structure.
181 * \return zero on success or a negative number on failure.
183 * Searches the mapping specified in \p arg and update the entry in
184 * drm_device::ctx_idr with it.
186 int drm_setsareactx(struct drm_device *dev, void *data,
187 struct drm_file *file_priv)
189 struct drm_ctx_priv_map *request = data;
190 struct drm_local_map *map = NULL;
191 struct drm_map_list *r_list = NULL;
193 mutex_lock(&dev->struct_mutex);
194 list_for_each_entry(r_list, &dev->maplist, head) {
195 if (r_list->map
196 && r_list->user_token == (unsigned long) request->handle)
197 goto found;
199 bad:
200 mutex_unlock(&dev->struct_mutex);
201 return -EINVAL;
203 found:
204 map = r_list->map;
205 if (!map)
206 goto bad;
208 if (IS_ERR(idr_replace(&dev->ctx_idr, map, request->ctx_id)))
209 goto bad;
211 mutex_unlock(&dev->struct_mutex);
213 return 0;
216 /*@}*/
218 /******************************************************************/
219 /** \name The actual DRM context handling routines */
220 /*@{*/
223 * Switch context.
225 * \param dev DRM device.
226 * \param old old context handle.
227 * \param new new context handle.
228 * \return zero on success or a negative number on failure.
230 * Attempt to set drm_device::context_flag.
232 static int drm_context_switch(struct drm_device * dev, int old, int new)
234 if (test_and_set_bit(0, &dev->context_flag)) {
235 DRM_ERROR("Reentering -- FIXME\n");
236 return -EBUSY;
239 DRM_DEBUG("Context switch from %d to %d\n", old, new);
241 if (new == dev->last_context) {
242 clear_bit(0, &dev->context_flag);
243 return 0;
246 return 0;
250 * Complete context switch.
252 * \param dev DRM device.
253 * \param new new context handle.
254 * \return zero on success or a negative number on failure.
256 * Updates drm_device::last_context and drm_device::last_switch. Verifies the
257 * hardware lock is held, clears the drm_device::context_flag and wakes up
258 * drm_device::context_wait.
260 static int drm_context_switch_complete(struct drm_device *dev,
261 struct drm_file *file_priv, int new)
263 dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
264 dev->last_switch = jiffies;
266 if (!_DRM_LOCK_IS_HELD(file_priv->master->lock.hw_lock->lock)) {
267 DRM_ERROR("Lock isn't held after context switch\n");
270 /* If a context switch is ever initiated
271 when the kernel holds the lock, release
272 that lock here. */
273 clear_bit(0, &dev->context_flag);
274 wake_up(&dev->context_wait);
276 return 0;
280 * Reserve contexts.
282 * \param inode device inode.
283 * \param file_priv DRM file private.
284 * \param cmd command.
285 * \param arg user argument pointing to a drm_ctx_res structure.
286 * \return zero on success or a negative number on failure.
288 int drm_resctx(struct drm_device *dev, void *data,
289 struct drm_file *file_priv)
291 struct drm_ctx_res *res = data;
292 struct drm_ctx ctx;
293 int i;
295 if (res->count >= DRM_RESERVED_CONTEXTS) {
296 memset(&ctx, 0, sizeof(ctx));
297 for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
298 ctx.handle = i;
299 if (copy_to_user(&res->contexts[i], &ctx, sizeof(ctx)))
300 return -EFAULT;
303 res->count = DRM_RESERVED_CONTEXTS;
305 return 0;
309 * Add context.
311 * \param inode device inode.
312 * \param file_priv DRM file private.
313 * \param cmd command.
314 * \param arg user argument pointing to a drm_ctx structure.
315 * \return zero on success or a negative number on failure.
317 * Get a new handle for the context and copy to userspace.
319 int drm_addctx(struct drm_device *dev, void *data,
320 struct drm_file *file_priv)
322 struct drm_ctx_list *ctx_entry;
323 struct drm_ctx *ctx = data;
325 ctx->handle = drm_ctxbitmap_next(dev);
326 if (ctx->handle == DRM_KERNEL_CONTEXT) {
327 /* Skip kernel's context and get a new one. */
328 ctx->handle = drm_ctxbitmap_next(dev);
330 DRM_DEBUG("%d\n", ctx->handle);
331 if (ctx->handle == -1) {
332 DRM_DEBUG("Not enough free contexts.\n");
333 /* Should this return -EBUSY instead? */
334 return -ENOMEM;
337 ctx_entry = kmalloc(sizeof(*ctx_entry), GFP_KERNEL);
338 if (!ctx_entry) {
339 DRM_DEBUG("out of memory\n");
340 return -ENOMEM;
343 INIT_LIST_HEAD(&ctx_entry->head);
344 ctx_entry->handle = ctx->handle;
345 ctx_entry->tag = file_priv;
347 mutex_lock(&dev->ctxlist_mutex);
348 list_add(&ctx_entry->head, &dev->ctxlist);
349 ++dev->ctx_count;
350 mutex_unlock(&dev->ctxlist_mutex);
352 return 0;
355 int drm_modctx(struct drm_device *dev, void *data, struct drm_file *file_priv)
357 /* This does nothing */
358 return 0;
362 * Get context.
364 * \param inode device inode.
365 * \param file_priv DRM file private.
366 * \param cmd command.
367 * \param arg user argument pointing to a drm_ctx structure.
368 * \return zero on success or a negative number on failure.
370 int drm_getctx(struct drm_device *dev, void *data, struct drm_file *file_priv)
372 struct drm_ctx *ctx = data;
374 /* This is 0, because we don't handle any context flags */
375 ctx->flags = 0;
377 return 0;
381 * Switch context.
383 * \param inode device inode.
384 * \param file_priv DRM file private.
385 * \param cmd command.
386 * \param arg user argument pointing to a drm_ctx structure.
387 * \return zero on success or a negative number on failure.
389 * Calls context_switch().
391 int drm_switchctx(struct drm_device *dev, void *data,
392 struct drm_file *file_priv)
394 struct drm_ctx *ctx = data;
396 DRM_DEBUG("%d\n", ctx->handle);
397 return drm_context_switch(dev, dev->last_context, ctx->handle);
401 * New context.
403 * \param inode device inode.
404 * \param file_priv DRM file private.
405 * \param cmd command.
406 * \param arg user argument pointing to a drm_ctx structure.
407 * \return zero on success or a negative number on failure.
409 * Calls context_switch_complete().
411 int drm_newctx(struct drm_device *dev, void *data,
412 struct drm_file *file_priv)
414 struct drm_ctx *ctx = data;
416 DRM_DEBUG("%d\n", ctx->handle);
417 drm_context_switch_complete(dev, file_priv, ctx->handle);
419 return 0;
423 * Remove context.
425 * \param inode device inode.
426 * \param file_priv DRM file private.
427 * \param cmd command.
428 * \param arg user argument pointing to a drm_ctx structure.
429 * \return zero on success or a negative number on failure.
431 * If not the special kernel context, calls ctxbitmap_free() to free the specified context.
433 int drm_rmctx(struct drm_device *dev, void *data,
434 struct drm_file *file_priv)
436 struct drm_ctx *ctx = data;
438 DRM_DEBUG("%d\n", ctx->handle);
439 if (ctx->handle != DRM_KERNEL_CONTEXT) {
440 if (dev->driver->context_dtor)
441 dev->driver->context_dtor(dev, ctx->handle);
442 drm_ctxbitmap_free(dev, ctx->handle);
445 mutex_lock(&dev->ctxlist_mutex);
446 if (!list_empty(&dev->ctxlist)) {
447 struct drm_ctx_list *pos, *n;
449 list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
450 if (pos->handle == ctx->handle) {
451 list_del(&pos->head);
452 kfree(pos);
453 --dev->ctx_count;
457 mutex_unlock(&dev->ctxlist_mutex);
459 return 0;
462 /*@}*/