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1/**
2 * \file drm_context.c
3 * IOCTLs for generic contexts
4 *
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
56 * in drm_device::ctx_idr, while holding the drm_device::struct_mutex
57 * lock.
58 */
59void drm_ctxbitmap_free(struct drm_device * dev, int ctx_handle)
60{
61 mutex_lock(&dev->struct_mutex);
62 idr_remove(&dev->ctx_idr, ctx_handle);
63 mutex_unlock(&dev->struct_mutex);
64}
65
66/**
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 *
72 * Allocate a new idr from drm_device::ctx_idr while holding the
73 * drm_device::struct_mutex lock.
74 */
75static int drm_ctxbitmap_next(struct drm_device * dev)
76{
77 int new_id;
78 int ret;
79
80again:
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 }
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;
91 }
92 mutex_unlock(&dev->struct_mutex);
93 return new_id;
94}
95
96/**
97 * Context bitmap initialization.
98 *
99 * \param dev DRM device.
100 *
101 * Initialise the drm_device::ctx_idr
102 */
103int drm_ctxbitmap_init(struct drm_device * dev)
104{
105 idr_init(&dev->ctx_idr);
106 return 0;
107}
108
109/**
110 * Context bitmap cleanup.
111 *
112 * \param dev DRM device.
113 *
114 * Free all idr members using drm_ctx_sarea_free helper function
115 * while holding the drm_device::struct_mutex lock.
116 */
117void drm_ctxbitmap_cleanup(struct drm_device * dev)
118{
119 mutex_lock(&dev->struct_mutex);
120 idr_remove_all(&dev->ctx_idr);
121 mutex_unlock(&dev->struct_mutex);
122}
123
124/*@}*/
125
126/******************************************************************/
127/** \name Per Context SAREA Support */
128/*@{*/
129
130/**
131 * Get per-context SAREA.
132 *
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.
138 *
139 * Gets the map from drm_device::ctx_idr with the handle specified and
140 * returns its handle.
141 */
142int drm_getsareactx(struct drm_device *dev, void *data,
143 struct drm_file *file_priv)
144{
145 struct drm_ctx_priv_map *request = data;
146 struct drm_local_map *map;
147 struct drm_map_list *_entry;
148
149 mutex_lock(&dev->struct_mutex);
150
151 map = idr_find(&dev->ctx_idr, request->ctx_id);
152 if (!map) {
153 mutex_unlock(&dev->struct_mutex);
154 return -EINVAL;
155 }
156
157 mutex_unlock(&dev->struct_mutex);
158
159 request->handle = NULL;
160 list_for_each_entry(_entry, &dev->maplist, head) {
161 if (_entry->map == map) {
162 request->handle =
163 (void *)(unsigned long)_entry->user_token;
164 break;
165 }
166 }
167 if (request->handle == NULL)
168 return -EINVAL;
169
170 return 0;
171}
172
173/**
174 * Set per-context SAREA.
175 *
176 * \param inode device inode.
177 * \param file_priv DRM file private.
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
183 * drm_device::ctx_idr with it.
184 */
185int drm_setsareactx(struct drm_device *dev, void *data,
186 struct drm_file *file_priv)
187{
188 struct drm_ctx_priv_map *request = data;
189 struct drm_local_map *map = NULL;
190 struct drm_map_list *r_list = NULL;
191
192 mutex_lock(&dev->struct_mutex);
193 list_for_each_entry(r_list, &dev->maplist, head) {
194 if (r_list->map
195 && r_list->user_token == (unsigned long) request->handle)
196 goto found;
197 }
198 bad:
199 mutex_unlock(&dev->struct_mutex);
200 return -EINVAL;
201
202 found:
203 map = r_list->map;
204 if (!map)
205 goto bad;
206
207 if (IS_ERR(idr_replace(&dev->ctx_idr, map, request->ctx_id)))
208 goto bad;
209
210 mutex_unlock(&dev->struct_mutex);
211
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 */
231static int drm_context_switch(struct drm_device * dev, int old, int new)
232{
233 if (test_and_set_bit(0, &dev->context_flag)) {
234 DRM_ERROR("Reentering -- FIXME\n");
235 return -EBUSY;
236 }
237
238 DRM_DEBUG("Context switch from %d to %d\n", old, new);
239
240 if (new == dev->last_context) {
241 clear_bit(0, &dev->context_flag);
242 return 0;
243 }
244
245 return 0;
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 */
259static int drm_context_switch_complete(struct drm_device *dev,
260 struct drm_file *file_priv, int new)
261{
262 dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
263 dev->last_switch = jiffies;
264
265 if (!_DRM_LOCK_IS_HELD(file_priv->master->lock.hw_lock->lock)) {
266 DRM_ERROR("Lock isn't held after context switch\n");
267 }
268
269 /* If a context switch is ever initiated
270 when the kernel holds the lock, release
271 that lock here. */
272 clear_bit(0, &dev->context_flag);
273 wake_up(&dev->context_wait);
274
275 return 0;
276}
277
278/**
279 * Reserve contexts.
280 *
281 * \param inode device inode.
282 * \param file_priv DRM file private.
283 * \param cmd command.
284 * \param arg user argument pointing to a drm_ctx_res structure.
285 * \return zero on success or a negative number on failure.
286 */
287int drm_resctx(struct drm_device *dev, void *data,
288 struct drm_file *file_priv)
289{
290 struct drm_ctx_res *res = data;
291 struct drm_ctx ctx;
292 int i;
293
294 if (res->count >= DRM_RESERVED_CONTEXTS) {
295 memset(&ctx, 0, sizeof(ctx));
296 for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
297 ctx.handle = i;
298 if (copy_to_user(&res->contexts[i], &ctx, sizeof(ctx)))
299 return -EFAULT;
300 }
301 }
302 res->count = DRM_RESERVED_CONTEXTS;
303
304 return 0;
305}
306
307/**
308 * Add context.
309 *
310 * \param inode device inode.
311 * \param file_priv DRM file private.
312 * \param cmd command.
313 * \param arg user argument pointing to a drm_ctx structure.
314 * \return zero on success or a negative number on failure.
315 *
316 * Get a new handle for the context and copy to userspace.
317 */
318int drm_addctx(struct drm_device *dev, void *data,
319 struct drm_file *file_priv)
320{
321 struct drm_ctx_list *ctx_entry;
322 struct drm_ctx *ctx = data;
323
324 ctx->handle = drm_ctxbitmap_next(dev);
325 if (ctx->handle == DRM_KERNEL_CONTEXT) {
326 /* Skip kernel's context and get a new one. */
327 ctx->handle = drm_ctxbitmap_next(dev);
328 }
329 DRM_DEBUG("%d\n", ctx->handle);
330 if (ctx->handle == -1) {
331 DRM_DEBUG("Not enough free contexts.\n");
332 /* Should this return -EBUSY instead? */
333 return -ENOMEM;
334 }
335
336 ctx_entry = kmalloc(sizeof(*ctx_entry), GFP_KERNEL);
337 if (!ctx_entry) {
338 DRM_DEBUG("out of memory\n");
339 return -ENOMEM;
340 }
341
342 INIT_LIST_HEAD(&ctx_entry->head);
343 ctx_entry->handle = ctx->handle;
344 ctx_entry->tag = file_priv;
345
346 mutex_lock(&dev->ctxlist_mutex);
347 list_add(&ctx_entry->head, &dev->ctxlist);
348 ++dev->ctx_count;
349 mutex_unlock(&dev->ctxlist_mutex);
350
351 return 0;
352}
353
354int drm_modctx(struct drm_device *dev, void *data, struct drm_file *file_priv)
355{
356 /* This does nothing */
357 return 0;
358}
359
360/**
361 * Get context.
362 *
363 * \param inode device inode.
364 * \param file_priv DRM file private.
365 * \param cmd command.
366 * \param arg user argument pointing to a drm_ctx structure.
367 * \return zero on success or a negative number on failure.
368 */
369int drm_getctx(struct drm_device *dev, void *data, struct drm_file *file_priv)
370{
371 struct drm_ctx *ctx = data;
372
373 /* This is 0, because we don't handle any context flags */
374 ctx->flags = 0;
375
376 return 0;
377}
378
379/**
380 * Switch context.
381 *
382 * \param inode device inode.
383 * \param file_priv DRM file private.
384 * \param cmd command.
385 * \param arg user argument pointing to a drm_ctx structure.
386 * \return zero on success or a negative number on failure.
387 *
388 * Calls context_switch().
389 */
390int drm_switchctx(struct drm_device *dev, void *data,
391 struct drm_file *file_priv)
392{
393 struct drm_ctx *ctx = data;
394
395 DRM_DEBUG("%d\n", ctx->handle);
396 return drm_context_switch(dev, dev->last_context, ctx->handle);
397}
398
399/**
400 * New context.
401 *
402 * \param inode device inode.
403 * \param file_priv DRM file private.
404 * \param cmd command.
405 * \param arg user argument pointing to a drm_ctx structure.
406 * \return zero on success or a negative number on failure.
407 *
408 * Calls context_switch_complete().
409 */
410int drm_newctx(struct drm_device *dev, void *data,
411 struct drm_file *file_priv)
412{
413 struct drm_ctx *ctx = data;
414
415 DRM_DEBUG("%d\n", ctx->handle);
416 drm_context_switch_complete(dev, file_priv, ctx->handle);
417
418 return 0;
419}
420
421/**
422 * Remove context.
423 *
424 * \param inode device inode.
425 * \param file_priv DRM file private.
426 * \param cmd command.
427 * \param arg user argument pointing to a drm_ctx structure.
428 * \return zero on success or a negative number on failure.
429 *
430 * If not the special kernel context, calls ctxbitmap_free() to free the specified context.
431 */
432int drm_rmctx(struct drm_device *dev, void *data,
433 struct drm_file *file_priv)
434{
435 struct drm_ctx *ctx = data;
436
437 DRM_DEBUG("%d\n", ctx->handle);
438 if (ctx->handle != DRM_KERNEL_CONTEXT) {
439 if (dev->driver->context_dtor)
440 dev->driver->context_dtor(dev, ctx->handle);
441 drm_ctxbitmap_free(dev, ctx->handle);
442 }
443
444 mutex_lock(&dev->ctxlist_mutex);
445 if (!list_empty(&dev->ctxlist)) {
446 struct drm_ctx_list *pos, *n;
447
448 list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
449 if (pos->handle == ctx->handle) {
450 list_del(&pos->head);
451 kfree(pos);
452 --dev->ctx_count;
453 }
454 }
455 }
456 mutex_unlock(&dev->ctxlist_mutex);
457
458 return 0;
459}
460
461/*@}*/
1/**
2 * \file drm_context.c
3 * IOCTLs for generic contexts
4 *
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 <drm/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
56 * in drm_device::ctx_idr, while holding the drm_device::struct_mutex
57 * lock.
58 */
59void drm_ctxbitmap_free(struct drm_device * dev, int ctx_handle)
60{
61 mutex_lock(&dev->struct_mutex);
62 idr_remove(&dev->ctx_idr, ctx_handle);
63 mutex_unlock(&dev->struct_mutex);
64}
65
66/**
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 *
72 * Allocate a new idr from drm_device::ctx_idr while holding the
73 * drm_device::struct_mutex lock.
74 */
75static int drm_ctxbitmap_next(struct drm_device * dev)
76{
77 int ret;
78
79 mutex_lock(&dev->struct_mutex);
80 ret = idr_alloc(&dev->ctx_idr, NULL, DRM_RESERVED_CONTEXTS, 0,
81 GFP_KERNEL);
82 mutex_unlock(&dev->struct_mutex);
83 return ret;
84}
85
86/**
87 * Context bitmap initialization.
88 *
89 * \param dev DRM device.
90 *
91 * Initialise the drm_device::ctx_idr
92 */
93int drm_ctxbitmap_init(struct drm_device * dev)
94{
95 idr_init(&dev->ctx_idr);
96 return 0;
97}
98
99/**
100 * Context bitmap cleanup.
101 *
102 * \param dev DRM device.
103 *
104 * Free all idr members using drm_ctx_sarea_free helper function
105 * while holding the drm_device::struct_mutex lock.
106 */
107void drm_ctxbitmap_cleanup(struct drm_device * dev)
108{
109 mutex_lock(&dev->struct_mutex);
110 idr_destroy(&dev->ctx_idr);
111 mutex_unlock(&dev->struct_mutex);
112}
113
114/*@}*/
115
116/******************************************************************/
117/** \name Per Context SAREA Support */
118/*@{*/
119
120/**
121 * Get per-context SAREA.
122 *
123 * \param inode device inode.
124 * \param file_priv DRM file private.
125 * \param cmd command.
126 * \param arg user argument pointing to a drm_ctx_priv_map structure.
127 * \return zero on success or a negative number on failure.
128 *
129 * Gets the map from drm_device::ctx_idr with the handle specified and
130 * returns its handle.
131 */
132int drm_getsareactx(struct drm_device *dev, void *data,
133 struct drm_file *file_priv)
134{
135 struct drm_ctx_priv_map *request = data;
136 struct drm_local_map *map;
137 struct drm_map_list *_entry;
138
139 mutex_lock(&dev->struct_mutex);
140
141 map = idr_find(&dev->ctx_idr, request->ctx_id);
142 if (!map) {
143 mutex_unlock(&dev->struct_mutex);
144 return -EINVAL;
145 }
146
147 request->handle = NULL;
148 list_for_each_entry(_entry, &dev->maplist, head) {
149 if (_entry->map == map) {
150 request->handle =
151 (void *)(unsigned long)_entry->user_token;
152 break;
153 }
154 }
155
156 mutex_unlock(&dev->struct_mutex);
157
158 if (request->handle == NULL)
159 return -EINVAL;
160
161 return 0;
162}
163
164/**
165 * Set per-context SAREA.
166 *
167 * \param inode device inode.
168 * \param file_priv DRM file private.
169 * \param cmd command.
170 * \param arg user argument pointing to a drm_ctx_priv_map structure.
171 * \return zero on success or a negative number on failure.
172 *
173 * Searches the mapping specified in \p arg and update the entry in
174 * drm_device::ctx_idr with it.
175 */
176int drm_setsareactx(struct drm_device *dev, void *data,
177 struct drm_file *file_priv)
178{
179 struct drm_ctx_priv_map *request = data;
180 struct drm_local_map *map = NULL;
181 struct drm_map_list *r_list = NULL;
182
183 mutex_lock(&dev->struct_mutex);
184 list_for_each_entry(r_list, &dev->maplist, head) {
185 if (r_list->map
186 && r_list->user_token == (unsigned long) request->handle)
187 goto found;
188 }
189 bad:
190 mutex_unlock(&dev->struct_mutex);
191 return -EINVAL;
192
193 found:
194 map = r_list->map;
195 if (!map)
196 goto bad;
197
198 if (IS_ERR(idr_replace(&dev->ctx_idr, map, request->ctx_id)))
199 goto bad;
200
201 mutex_unlock(&dev->struct_mutex);
202
203 return 0;
204}
205
206/*@}*/
207
208/******************************************************************/
209/** \name The actual DRM context handling routines */
210/*@{*/
211
212/**
213 * Switch context.
214 *
215 * \param dev DRM device.
216 * \param old old context handle.
217 * \param new new context handle.
218 * \return zero on success or a negative number on failure.
219 *
220 * Attempt to set drm_device::context_flag.
221 */
222static int drm_context_switch(struct drm_device * dev, int old, int new)
223{
224 if (test_and_set_bit(0, &dev->context_flag)) {
225 DRM_ERROR("Reentering -- FIXME\n");
226 return -EBUSY;
227 }
228
229 DRM_DEBUG("Context switch from %d to %d\n", old, new);
230
231 if (new == dev->last_context) {
232 clear_bit(0, &dev->context_flag);
233 return 0;
234 }
235
236 return 0;
237}
238
239/**
240 * Complete context switch.
241 *
242 * \param dev DRM device.
243 * \param new new context handle.
244 * \return zero on success or a negative number on failure.
245 *
246 * Updates drm_device::last_context and drm_device::last_switch. Verifies the
247 * hardware lock is held, clears the drm_device::context_flag and wakes up
248 * drm_device::context_wait.
249 */
250static int drm_context_switch_complete(struct drm_device *dev,
251 struct drm_file *file_priv, int new)
252{
253 dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
254
255 if (!_DRM_LOCK_IS_HELD(file_priv->master->lock.hw_lock->lock)) {
256 DRM_ERROR("Lock isn't held after context switch\n");
257 }
258
259 /* If a context switch is ever initiated
260 when the kernel holds the lock, release
261 that lock here. */
262 clear_bit(0, &dev->context_flag);
263
264 return 0;
265}
266
267/**
268 * Reserve contexts.
269 *
270 * \param inode device inode.
271 * \param file_priv DRM file private.
272 * \param cmd command.
273 * \param arg user argument pointing to a drm_ctx_res structure.
274 * \return zero on success or a negative number on failure.
275 */
276int drm_resctx(struct drm_device *dev, void *data,
277 struct drm_file *file_priv)
278{
279 struct drm_ctx_res *res = data;
280 struct drm_ctx ctx;
281 int i;
282
283 if (res->count >= DRM_RESERVED_CONTEXTS) {
284 memset(&ctx, 0, sizeof(ctx));
285 for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
286 ctx.handle = i;
287 if (copy_to_user(&res->contexts[i], &ctx, sizeof(ctx)))
288 return -EFAULT;
289 }
290 }
291 res->count = DRM_RESERVED_CONTEXTS;
292
293 return 0;
294}
295
296/**
297 * Add context.
298 *
299 * \param inode device inode.
300 * \param file_priv DRM file private.
301 * \param cmd command.
302 * \param arg user argument pointing to a drm_ctx structure.
303 * \return zero on success or a negative number on failure.
304 *
305 * Get a new handle for the context and copy to userspace.
306 */
307int drm_addctx(struct drm_device *dev, void *data,
308 struct drm_file *file_priv)
309{
310 struct drm_ctx_list *ctx_entry;
311 struct drm_ctx *ctx = data;
312
313 ctx->handle = drm_ctxbitmap_next(dev);
314 if (ctx->handle == DRM_KERNEL_CONTEXT) {
315 /* Skip kernel's context and get a new one. */
316 ctx->handle = drm_ctxbitmap_next(dev);
317 }
318 DRM_DEBUG("%d\n", ctx->handle);
319 if (ctx->handle == -1) {
320 DRM_DEBUG("Not enough free contexts.\n");
321 /* Should this return -EBUSY instead? */
322 return -ENOMEM;
323 }
324
325 ctx_entry = kmalloc(sizeof(*ctx_entry), GFP_KERNEL);
326 if (!ctx_entry) {
327 DRM_DEBUG("out of memory\n");
328 return -ENOMEM;
329 }
330
331 INIT_LIST_HEAD(&ctx_entry->head);
332 ctx_entry->handle = ctx->handle;
333 ctx_entry->tag = file_priv;
334
335 mutex_lock(&dev->ctxlist_mutex);
336 list_add(&ctx_entry->head, &dev->ctxlist);
337 mutex_unlock(&dev->ctxlist_mutex);
338
339 return 0;
340}
341
342/**
343 * Get context.
344 *
345 * \param inode device inode.
346 * \param file_priv DRM file private.
347 * \param cmd command.
348 * \param arg user argument pointing to a drm_ctx structure.
349 * \return zero on success or a negative number on failure.
350 */
351int drm_getctx(struct drm_device *dev, void *data, struct drm_file *file_priv)
352{
353 struct drm_ctx *ctx = data;
354
355 /* This is 0, because we don't handle any context flags */
356 ctx->flags = 0;
357
358 return 0;
359}
360
361/**
362 * Switch context.
363 *
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.
369 *
370 * Calls context_switch().
371 */
372int drm_switchctx(struct drm_device *dev, void *data,
373 struct drm_file *file_priv)
374{
375 struct drm_ctx *ctx = data;
376
377 DRM_DEBUG("%d\n", ctx->handle);
378 return drm_context_switch(dev, dev->last_context, ctx->handle);
379}
380
381/**
382 * New context.
383 *
384 * \param inode device inode.
385 * \param file_priv DRM file private.
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_complete().
391 */
392int drm_newctx(struct drm_device *dev, void *data,
393 struct drm_file *file_priv)
394{
395 struct drm_ctx *ctx = data;
396
397 DRM_DEBUG("%d\n", ctx->handle);
398 drm_context_switch_complete(dev, file_priv, ctx->handle);
399
400 return 0;
401}
402
403/**
404 * Remove context.
405 *
406 * \param inode device inode.
407 * \param file_priv DRM file private.
408 * \param cmd command.
409 * \param arg user argument pointing to a drm_ctx structure.
410 * \return zero on success or a negative number on failure.
411 *
412 * If not the special kernel context, calls ctxbitmap_free() to free the specified context.
413 */
414int drm_rmctx(struct drm_device *dev, void *data,
415 struct drm_file *file_priv)
416{
417 struct drm_ctx *ctx = data;
418
419 DRM_DEBUG("%d\n", ctx->handle);
420 if (ctx->handle != DRM_KERNEL_CONTEXT) {
421 if (dev->driver->context_dtor)
422 dev->driver->context_dtor(dev, ctx->handle);
423 drm_ctxbitmap_free(dev, ctx->handle);
424 }
425
426 mutex_lock(&dev->ctxlist_mutex);
427 if (!list_empty(&dev->ctxlist)) {
428 struct drm_ctx_list *pos, *n;
429
430 list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
431 if (pos->handle == ctx->handle) {
432 list_del(&pos->head);
433 kfree(pos);
434 }
435 }
436 }
437 mutex_unlock(&dev->ctxlist_mutex);
438
439 return 0;
440}
441
442/*@}*/