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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 "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 mutex_unlock(&dev->struct_mutex);
89 if (ret == -EAGAIN)
90 goto again;
91 else if (ret)
92 return ret;
93
94 return new_id;
95}
96
97/**
98 * Context bitmap initialization.
99 *
100 * \param dev DRM device.
101 *
102 * Initialise the drm_device::ctx_idr
103 */
104int drm_ctxbitmap_init(struct drm_device * dev)
105{
106 idr_init(&dev->ctx_idr);
107 return 0;
108}
109
110/**
111 * Context bitmap cleanup.
112 *
113 * \param dev DRM device.
114 *
115 * Free all idr members using drm_ctx_sarea_free helper function
116 * while holding the drm_device::struct_mutex lock.
117 */
118void drm_ctxbitmap_cleanup(struct drm_device * dev)
119{
120 mutex_lock(&dev->struct_mutex);
121 idr_remove_all(&dev->ctx_idr);
122 mutex_unlock(&dev->struct_mutex);
123}
124
125/*@}*/
126
127/******************************************************************/
128/** \name Per Context SAREA Support */
129/*@{*/
130
131/**
132 * Get per-context SAREA.
133 *
134 * \param inode device inode.
135 * \param file_priv DRM file private.
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 *
140 * Gets the map from drm_device::ctx_idr with the handle specified and
141 * returns its handle.
142 */
143int drm_getsareactx(struct drm_device *dev, void *data,
144 struct drm_file *file_priv)
145{
146 struct drm_ctx_priv_map *request = data;
147 struct drm_local_map *map;
148 struct drm_map_list *_entry;
149
150 mutex_lock(&dev->struct_mutex);
151
152 map = idr_find(&dev->ctx_idr, request->ctx_id);
153 if (!map) {
154 mutex_unlock(&dev->struct_mutex);
155 return -EINVAL;
156 }
157
158 request->handle = NULL;
159 list_for_each_entry(_entry, &dev->maplist, head) {
160 if (_entry->map == map) {
161 request->handle =
162 (void *)(unsigned long)_entry->user_token;
163 break;
164 }
165 }
166
167 mutex_unlock(&dev->struct_mutex);
168
169 if (request->handle == NULL)
170 return -EINVAL;
171
172 return 0;
173}
174
175/**
176 * Set per-context SAREA.
177 *
178 * \param inode device inode.
179 * \param file_priv DRM file private.
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
185 * drm_device::ctx_idr with it.
186 */
187int drm_setsareactx(struct drm_device *dev, void *data,
188 struct drm_file *file_priv)
189{
190 struct drm_ctx_priv_map *request = data;
191 struct drm_local_map *map = NULL;
192 struct drm_map_list *r_list = NULL;
193
194 mutex_lock(&dev->struct_mutex);
195 list_for_each_entry(r_list, &dev->maplist, head) {
196 if (r_list->map
197 && r_list->user_token == (unsigned long) request->handle)
198 goto found;
199 }
200 bad:
201 mutex_unlock(&dev->struct_mutex);
202 return -EINVAL;
203
204 found:
205 map = r_list->map;
206 if (!map)
207 goto bad;
208
209 if (IS_ERR(idr_replace(&dev->ctx_idr, map, request->ctx_id)))
210 goto bad;
211
212 mutex_unlock(&dev->struct_mutex);
213
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 */
233static int drm_context_switch(struct drm_device * dev, int old, int new)
234{
235 if (test_and_set_bit(0, &dev->context_flag)) {
236 DRM_ERROR("Reentering -- FIXME\n");
237 return -EBUSY;
238 }
239
240 DRM_DEBUG("Context switch from %d to %d\n", old, new);
241
242 if (new == dev->last_context) {
243 clear_bit(0, &dev->context_flag);
244 return 0;
245 }
246
247 return 0;
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 */
261static int drm_context_switch_complete(struct drm_device *dev,
262 struct drm_file *file_priv, int new)
263{
264 dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
265 dev->last_switch = jiffies;
266
267 if (!_DRM_LOCK_IS_HELD(file_priv->master->lock.hw_lock->lock)) {
268 DRM_ERROR("Lock isn't held after context switch\n");
269 }
270
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);
276
277 return 0;
278}
279
280/**
281 * Reserve contexts.
282 *
283 * \param inode device inode.
284 * \param file_priv DRM file private.
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 */
289int drm_resctx(struct drm_device *dev, void *data,
290 struct drm_file *file_priv)
291{
292 struct drm_ctx_res *res = data;
293 struct drm_ctx ctx;
294 int i;
295
296 if (res->count >= DRM_RESERVED_CONTEXTS) {
297 memset(&ctx, 0, sizeof(ctx));
298 for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
299 ctx.handle = i;
300 if (copy_to_user(&res->contexts[i], &ctx, sizeof(ctx)))
301 return -EFAULT;
302 }
303 }
304 res->count = DRM_RESERVED_CONTEXTS;
305
306 return 0;
307}
308
309/**
310 * Add context.
311 *
312 * \param inode device inode.
313 * \param file_priv DRM file private.
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 */
320int drm_addctx(struct drm_device *dev, void *data,
321 struct drm_file *file_priv)
322{
323 struct drm_ctx_list *ctx_entry;
324 struct drm_ctx *ctx = data;
325
326 ctx->handle = drm_ctxbitmap_next(dev);
327 if (ctx->handle == DRM_KERNEL_CONTEXT) {
328 /* Skip kernel's context and get a new one. */
329 ctx->handle = drm_ctxbitmap_next(dev);
330 }
331 DRM_DEBUG("%d\n", ctx->handle);
332 if (ctx->handle == -1) {
333 DRM_DEBUG("Not enough free contexts.\n");
334 /* Should this return -EBUSY instead? */
335 return -ENOMEM;
336 }
337
338 ctx_entry = kmalloc(sizeof(*ctx_entry), GFP_KERNEL);
339 if (!ctx_entry) {
340 DRM_DEBUG("out of memory\n");
341 return -ENOMEM;
342 }
343
344 INIT_LIST_HEAD(&ctx_entry->head);
345 ctx_entry->handle = ctx->handle;
346 ctx_entry->tag = file_priv;
347
348 mutex_lock(&dev->ctxlist_mutex);
349 list_add(&ctx_entry->head, &dev->ctxlist);
350 ++dev->ctx_count;
351 mutex_unlock(&dev->ctxlist_mutex);
352
353 return 0;
354}
355
356int drm_modctx(struct drm_device *dev, void *data, struct drm_file *file_priv)
357{
358 /* This does nothing */
359 return 0;
360}
361
362/**
363 * Get context.
364 *
365 * \param inode device inode.
366 * \param file_priv DRM file private.
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 */
371int drm_getctx(struct drm_device *dev, void *data, struct drm_file *file_priv)
372{
373 struct drm_ctx *ctx = data;
374
375 /* This is 0, because we don't handle any context flags */
376 ctx->flags = 0;
377
378 return 0;
379}
380
381/**
382 * Switch 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().
391 */
392int drm_switchctx(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 return drm_context_switch(dev, dev->last_context, ctx->handle);
399}
400
401/**
402 * New context.
403 *
404 * \param inode device inode.
405 * \param file_priv DRM file private.
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 */
412int drm_newctx(struct drm_device *dev, void *data,
413 struct drm_file *file_priv)
414{
415 struct drm_ctx *ctx = data;
416
417 DRM_DEBUG("%d\n", ctx->handle);
418 drm_context_switch_complete(dev, file_priv, ctx->handle);
419
420 return 0;
421}
422
423/**
424 * Remove context.
425 *
426 * \param inode device inode.
427 * \param file_priv DRM file private.
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 */
434int drm_rmctx(struct drm_device *dev, void *data,
435 struct drm_file *file_priv)
436{
437 struct drm_ctx *ctx = data;
438
439 DRM_DEBUG("%d\n", ctx->handle);
440 if (ctx->handle != DRM_KERNEL_CONTEXT) {
441 if (dev->driver->context_dtor)
442 dev->driver->context_dtor(dev, ctx->handle);
443 drm_ctxbitmap_free(dev, ctx->handle);
444 }
445
446 mutex_lock(&dev->ctxlist_mutex);
447 if (!list_empty(&dev->ctxlist)) {
448 struct drm_ctx_list *pos, *n;
449
450 list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
451 if (pos->handle == ctx->handle) {
452 list_del(&pos->head);
453 kfree(pos);
454 --dev->ctx_count;
455 }
456 }
457 }
458 mutex_unlock(&dev->ctxlist_mutex);
459
460 return 0;
461}
462
463/*@}*/