3 * IOCTLs for generic contexts
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
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
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.
38 * 2001-11-16 Torsten Duwe <duwe@caldera.de>
39 * added context constructor/destructor hooks,
40 * needed by SiS driver's memory management.
45 /******************************************************************/
46 /** \name Context bitmap support */
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
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
);
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
)
81 if (idr_pre_get(&dev
->ctx_idr
, GFP_KERNEL
) == 0) {
82 DRM_ERROR("Out of memory expanding drawable idr\n");
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
);
98 * Context bitmap initialization.
100 * \param dev DRM device.
102 * Initialise the drm_device::ctx_idr
104 int drm_ctxbitmap_init(struct drm_device
* dev
)
106 idr_init(&dev
->ctx_idr
);
111 * Context bitmap cleanup.
113 * \param dev DRM device.
115 * Free all idr members using drm_ctx_sarea_free helper function
116 * while holding the drm_device::struct_mutex lock.
118 void drm_ctxbitmap_cleanup(struct drm_device
* dev
)
120 mutex_lock(&dev
->struct_mutex
);
121 idr_remove_all(&dev
->ctx_idr
);
122 mutex_unlock(&dev
->struct_mutex
);
127 /******************************************************************/
128 /** \name Per Context SAREA Support */
132 * Get per-context SAREA.
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.
140 * Gets the map from drm_device::ctx_idr with the handle specified and
141 * returns its handle.
143 int drm_getsareactx(struct drm_device
*dev
, void *data
,
144 struct drm_file
*file_priv
)
146 struct drm_ctx_priv_map
*request
= data
;
147 struct drm_local_map
*map
;
148 struct drm_map_list
*_entry
;
150 mutex_lock(&dev
->struct_mutex
);
152 map
= idr_find(&dev
->ctx_idr
, request
->ctx_id
);
154 mutex_unlock(&dev
->struct_mutex
);
158 request
->handle
= NULL
;
159 list_for_each_entry(_entry
, &dev
->maplist
, head
) {
160 if (_entry
->map
== map
) {
162 (void *)(unsigned long)_entry
->user_token
;
167 mutex_unlock(&dev
->struct_mutex
);
169 if (request
->handle
== NULL
)
176 * Set per-context SAREA.
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.
184 * Searches the mapping specified in \p arg and update the entry in
185 * drm_device::ctx_idr with it.
187 int drm_setsareactx(struct drm_device
*dev
, void *data
,
188 struct drm_file
*file_priv
)
190 struct drm_ctx_priv_map
*request
= data
;
191 struct drm_local_map
*map
= NULL
;
192 struct drm_map_list
*r_list
= NULL
;
194 mutex_lock(&dev
->struct_mutex
);
195 list_for_each_entry(r_list
, &dev
->maplist
, head
) {
197 && r_list
->user_token
== (unsigned long) request
->handle
)
201 mutex_unlock(&dev
->struct_mutex
);
209 if (IS_ERR(idr_replace(&dev
->ctx_idr
, map
, request
->ctx_id
)))
212 mutex_unlock(&dev
->struct_mutex
);
219 /******************************************************************/
220 /** \name The actual DRM context handling routines */
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.
231 * Attempt to set drm_device::context_flag.
233 static int drm_context_switch(struct drm_device
* dev
, int old
, int new)
235 if (test_and_set_bit(0, &dev
->context_flag
)) {
236 DRM_ERROR("Reentering -- FIXME\n");
240 DRM_DEBUG("Context switch from %d to %d\n", old
, new);
242 if (new == dev
->last_context
) {
243 clear_bit(0, &dev
->context_flag
);
251 * Complete context switch.
253 * \param dev DRM device.
254 * \param new new context handle.
255 * \return zero on success or a negative number on failure.
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.
261 static int drm_context_switch_complete(struct drm_device
*dev
,
262 struct drm_file
*file_priv
, int new)
264 dev
->last_context
= new; /* PRE/POST: This is the _only_ writer. */
265 dev
->last_switch
= jiffies
;
267 if (!_DRM_LOCK_IS_HELD(file_priv
->master
->lock
.hw_lock
->lock
)) {
268 DRM_ERROR("Lock isn't held after context switch\n");
271 /* If a context switch is ever initiated
272 when the kernel holds the lock, release
274 clear_bit(0, &dev
->context_flag
);
275 wake_up(&dev
->context_wait
);
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.
289 int drm_resctx(struct drm_device
*dev
, void *data
,
290 struct drm_file
*file_priv
)
292 struct drm_ctx_res
*res
= data
;
296 if (res
->count
>= DRM_RESERVED_CONTEXTS
) {
297 memset(&ctx
, 0, sizeof(ctx
));
298 for (i
= 0; i
< DRM_RESERVED_CONTEXTS
; i
++) {
300 if (copy_to_user(&res
->contexts
[i
], &ctx
, sizeof(ctx
)))
304 res
->count
= DRM_RESERVED_CONTEXTS
;
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.
318 * Get a new handle for the context and copy to userspace.
320 int drm_addctx(struct drm_device
*dev
, void *data
,
321 struct drm_file
*file_priv
)
323 struct drm_ctx_list
*ctx_entry
;
324 struct drm_ctx
*ctx
= data
;
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
);
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? */
338 ctx_entry
= kmalloc(sizeof(*ctx_entry
), GFP_KERNEL
);
340 DRM_DEBUG("out of memory\n");
344 INIT_LIST_HEAD(&ctx_entry
->head
);
345 ctx_entry
->handle
= ctx
->handle
;
346 ctx_entry
->tag
= file_priv
;
348 mutex_lock(&dev
->ctxlist_mutex
);
349 list_add(&ctx_entry
->head
, &dev
->ctxlist
);
351 mutex_unlock(&dev
->ctxlist_mutex
);
356 int drm_modctx(struct drm_device
*dev
, void *data
, struct drm_file
*file_priv
)
358 /* This does nothing */
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.
371 int drm_getctx(struct drm_device
*dev
, void *data
, struct drm_file
*file_priv
)
373 struct drm_ctx
*ctx
= data
;
375 /* This is 0, because we don't handle any context flags */
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.
390 * Calls context_switch().
392 int drm_switchctx(struct drm_device
*dev
, void *data
,
393 struct drm_file
*file_priv
)
395 struct drm_ctx
*ctx
= data
;
397 DRM_DEBUG("%d\n", ctx
->handle
);
398 return drm_context_switch(dev
, dev
->last_context
, ctx
->handle
);
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.
410 * Calls context_switch_complete().
412 int drm_newctx(struct drm_device
*dev
, void *data
,
413 struct drm_file
*file_priv
)
415 struct drm_ctx
*ctx
= data
;
417 DRM_DEBUG("%d\n", ctx
->handle
);
418 drm_context_switch_complete(dev
, file_priv
, ctx
->handle
);
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.
432 * If not the special kernel context, calls ctxbitmap_free() to free the specified context.
434 int drm_rmctx(struct drm_device
*dev
, void *data
,
435 struct drm_file
*file_priv
)
437 struct drm_ctx
*ctx
= data
;
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
);
446 mutex_lock(&dev
->ctxlist_mutex
);
447 if (!list_empty(&dev
->ctxlist
)) {
448 struct drm_ctx_list
*pos
, *n
;
450 list_for_each_entry_safe(pos
, n
, &dev
->ctxlist
, head
) {
451 if (pos
->handle
== ctx
->handle
) {
452 list_del(&pos
->head
);
458 mutex_unlock(&dev
->ctxlist_mutex
);
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