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.
46 * Free a handle from the context bitmap.
48 * \param dev DRM device.
49 * \param ctx_handle context handle.
51 * Clears the bit specified by \p ctx_handle in drm_device::ctx_bitmap and the entry
52 * in drm_device::ctx_idr, while holding the drm_device::struct_mutex
55 static void drm_ctxbitmap_free(struct drm_device
* dev
, int ctx_handle
)
57 if (drm_core_check_feature(dev
, DRIVER_MODESET
))
60 mutex_lock(&dev
->struct_mutex
);
61 idr_remove(&dev
->ctx_idr
, ctx_handle
);
62 mutex_unlock(&dev
->struct_mutex
);
65 /******************************************************************/
66 /** \name Context bitmap support */
69 void drm_legacy_ctxbitmap_release(struct drm_device
*dev
,
70 struct drm_file
*file_priv
)
72 if (drm_core_check_feature(dev
, DRIVER_MODESET
))
75 mutex_lock(&dev
->ctxlist_mutex
);
76 if (!list_empty(&dev
->ctxlist
)) {
77 struct drm_ctx_list
*pos
, *n
;
79 list_for_each_entry_safe(pos
, n
, &dev
->ctxlist
, head
) {
80 if (pos
->tag
== file_priv
&&
81 pos
->handle
!= DRM_KERNEL_CONTEXT
) {
82 if (dev
->driver
->context_dtor
)
83 dev
->driver
->context_dtor(dev
,
86 drm_ctxbitmap_free(dev
, pos
->handle
);
94 mutex_unlock(&dev
->ctxlist_mutex
);
98 * Context bitmap allocation.
100 * \param dev DRM device.
101 * \return (non-negative) context handle on success or a negative number on failure.
103 * Allocate a new idr from drm_device::ctx_idr while holding the
104 * drm_device::struct_mutex lock.
106 static int drm_ctxbitmap_next(struct drm_device
* dev
)
110 mutex_lock(&dev
->struct_mutex
);
111 ret
= idr_alloc(&dev
->ctx_idr
, NULL
, DRM_RESERVED_CONTEXTS
, 0,
113 mutex_unlock(&dev
->struct_mutex
);
118 * Context bitmap initialization.
120 * \param dev DRM device.
122 * Initialise the drm_device::ctx_idr
124 void drm_legacy_ctxbitmap_init(struct drm_device
* dev
)
126 if (drm_core_check_feature(dev
, DRIVER_MODESET
))
129 idr_init(&dev
->ctx_idr
);
133 * Context bitmap cleanup.
135 * \param dev DRM device.
137 * Free all idr members using drm_ctx_sarea_free helper function
138 * while holding the drm_device::struct_mutex lock.
140 void drm_legacy_ctxbitmap_cleanup(struct drm_device
* dev
)
142 mutex_lock(&dev
->struct_mutex
);
143 idr_destroy(&dev
->ctx_idr
);
144 mutex_unlock(&dev
->struct_mutex
);
149 /******************************************************************/
150 /** \name Per Context SAREA Support */
154 * Get per-context SAREA.
156 * \param inode device inode.
157 * \param file_priv DRM file private.
158 * \param cmd command.
159 * \param arg user argument pointing to a drm_ctx_priv_map structure.
160 * \return zero on success or a negative number on failure.
162 * Gets the map from drm_device::ctx_idr with the handle specified and
163 * returns its handle.
165 int drm_getsareactx(struct drm_device
*dev
, void *data
,
166 struct drm_file
*file_priv
)
168 struct drm_ctx_priv_map
*request
= data
;
169 struct drm_local_map
*map
;
170 struct drm_map_list
*_entry
;
172 if (drm_core_check_feature(dev
, DRIVER_MODESET
))
175 mutex_lock(&dev
->struct_mutex
);
177 map
= idr_find(&dev
->ctx_idr
, request
->ctx_id
);
179 mutex_unlock(&dev
->struct_mutex
);
183 request
->handle
= NULL
;
184 list_for_each_entry(_entry
, &dev
->maplist
, head
) {
185 if (_entry
->map
== map
) {
187 (void *)(unsigned long)_entry
->user_token
;
192 mutex_unlock(&dev
->struct_mutex
);
194 if (request
->handle
== NULL
)
201 * Set per-context SAREA.
203 * \param inode device inode.
204 * \param file_priv DRM file private.
205 * \param cmd command.
206 * \param arg user argument pointing to a drm_ctx_priv_map structure.
207 * \return zero on success or a negative number on failure.
209 * Searches the mapping specified in \p arg and update the entry in
210 * drm_device::ctx_idr with it.
212 int drm_setsareactx(struct drm_device
*dev
, void *data
,
213 struct drm_file
*file_priv
)
215 struct drm_ctx_priv_map
*request
= data
;
216 struct drm_local_map
*map
= NULL
;
217 struct drm_map_list
*r_list
= NULL
;
219 if (drm_core_check_feature(dev
, DRIVER_MODESET
))
222 mutex_lock(&dev
->struct_mutex
);
223 list_for_each_entry(r_list
, &dev
->maplist
, head
) {
225 && r_list
->user_token
== (unsigned long) request
->handle
)
229 mutex_unlock(&dev
->struct_mutex
);
237 if (IS_ERR(idr_replace(&dev
->ctx_idr
, map
, request
->ctx_id
)))
240 mutex_unlock(&dev
->struct_mutex
);
247 /******************************************************************/
248 /** \name The actual DRM context handling routines */
254 * \param dev DRM device.
255 * \param old old context handle.
256 * \param new new context handle.
257 * \return zero on success or a negative number on failure.
259 * Attempt to set drm_device::context_flag.
261 static int drm_context_switch(struct drm_device
* dev
, int old
, int new)
263 if (test_and_set_bit(0, &dev
->context_flag
)) {
264 DRM_ERROR("Reentering -- FIXME\n");
268 DRM_DEBUG("Context switch from %d to %d\n", old
, new);
270 if (new == dev
->last_context
) {
271 clear_bit(0, &dev
->context_flag
);
279 * Complete context switch.
281 * \param dev DRM device.
282 * \param new new context handle.
283 * \return zero on success or a negative number on failure.
285 * Updates drm_device::last_context and drm_device::last_switch. Verifies the
286 * hardware lock is held, clears the drm_device::context_flag and wakes up
287 * drm_device::context_wait.
289 static int drm_context_switch_complete(struct drm_device
*dev
,
290 struct drm_file
*file_priv
, int new)
292 dev
->last_context
= new; /* PRE/POST: This is the _only_ writer. */
294 if (!_DRM_LOCK_IS_HELD(file_priv
->master
->lock
.hw_lock
->lock
)) {
295 DRM_ERROR("Lock isn't held after context switch\n");
298 /* If a context switch is ever initiated
299 when the kernel holds the lock, release
301 clear_bit(0, &dev
->context_flag
);
309 * \param inode device inode.
310 * \param file_priv DRM file private.
311 * \param cmd command.
312 * \param arg user argument pointing to a drm_ctx_res structure.
313 * \return zero on success or a negative number on failure.
315 int drm_resctx(struct drm_device
*dev
, void *data
,
316 struct drm_file
*file_priv
)
318 struct drm_ctx_res
*res
= data
;
322 if (drm_core_check_feature(dev
, DRIVER_MODESET
))
325 if (res
->count
>= DRM_RESERVED_CONTEXTS
) {
326 memset(&ctx
, 0, sizeof(ctx
));
327 for (i
= 0; i
< DRM_RESERVED_CONTEXTS
; i
++) {
329 if (copy_to_user(&res
->contexts
[i
], &ctx
, sizeof(ctx
)))
333 res
->count
= DRM_RESERVED_CONTEXTS
;
341 * \param inode device inode.
342 * \param file_priv DRM file private.
343 * \param cmd command.
344 * \param arg user argument pointing to a drm_ctx structure.
345 * \return zero on success or a negative number on failure.
347 * Get a new handle for the context and copy to userspace.
349 int drm_addctx(struct drm_device
*dev
, void *data
,
350 struct drm_file
*file_priv
)
352 struct drm_ctx_list
*ctx_entry
;
353 struct drm_ctx
*ctx
= data
;
355 if (drm_core_check_feature(dev
, DRIVER_MODESET
))
358 ctx
->handle
= drm_ctxbitmap_next(dev
);
359 if (ctx
->handle
== DRM_KERNEL_CONTEXT
) {
360 /* Skip kernel's context and get a new one. */
361 ctx
->handle
= drm_ctxbitmap_next(dev
);
363 DRM_DEBUG("%d\n", ctx
->handle
);
364 if (ctx
->handle
== -1) {
365 DRM_DEBUG("Not enough free contexts.\n");
366 /* Should this return -EBUSY instead? */
370 ctx_entry
= kmalloc(sizeof(*ctx_entry
), GFP_KERNEL
);
372 DRM_DEBUG("out of memory\n");
376 INIT_LIST_HEAD(&ctx_entry
->head
);
377 ctx_entry
->handle
= ctx
->handle
;
378 ctx_entry
->tag
= file_priv
;
380 mutex_lock(&dev
->ctxlist_mutex
);
381 list_add(&ctx_entry
->head
, &dev
->ctxlist
);
383 mutex_unlock(&dev
->ctxlist_mutex
);
391 * \param inode device inode.
392 * \param file_priv DRM file private.
393 * \param cmd command.
394 * \param arg user argument pointing to a drm_ctx structure.
395 * \return zero on success or a negative number on failure.
397 int drm_getctx(struct drm_device
*dev
, void *data
, struct drm_file
*file_priv
)
399 struct drm_ctx
*ctx
= data
;
401 if (drm_core_check_feature(dev
, DRIVER_MODESET
))
404 /* This is 0, because we don't handle any context flags */
413 * \param inode device inode.
414 * \param file_priv DRM file private.
415 * \param cmd command.
416 * \param arg user argument pointing to a drm_ctx structure.
417 * \return zero on success or a negative number on failure.
419 * Calls context_switch().
421 int drm_switchctx(struct drm_device
*dev
, void *data
,
422 struct drm_file
*file_priv
)
424 struct drm_ctx
*ctx
= data
;
426 if (drm_core_check_feature(dev
, DRIVER_MODESET
))
429 DRM_DEBUG("%d\n", ctx
->handle
);
430 return drm_context_switch(dev
, dev
->last_context
, ctx
->handle
);
436 * \param inode device inode.
437 * \param file_priv DRM file private.
438 * \param cmd command.
439 * \param arg user argument pointing to a drm_ctx structure.
440 * \return zero on success or a negative number on failure.
442 * Calls context_switch_complete().
444 int drm_newctx(struct drm_device
*dev
, void *data
,
445 struct drm_file
*file_priv
)
447 struct drm_ctx
*ctx
= data
;
449 if (drm_core_check_feature(dev
, DRIVER_MODESET
))
452 DRM_DEBUG("%d\n", ctx
->handle
);
453 drm_context_switch_complete(dev
, file_priv
, ctx
->handle
);
461 * \param inode device inode.
462 * \param file_priv DRM file private.
463 * \param cmd command.
464 * \param arg user argument pointing to a drm_ctx structure.
465 * \return zero on success or a negative number on failure.
467 * If not the special kernel context, calls ctxbitmap_free() to free the specified context.
469 int drm_rmctx(struct drm_device
*dev
, void *data
,
470 struct drm_file
*file_priv
)
472 struct drm_ctx
*ctx
= data
;
474 if (drm_core_check_feature(dev
, DRIVER_MODESET
))
477 DRM_DEBUG("%d\n", ctx
->handle
);
478 if (ctx
->handle
!= DRM_KERNEL_CONTEXT
) {
479 if (dev
->driver
->context_dtor
)
480 dev
->driver
->context_dtor(dev
, ctx
->handle
);
481 drm_ctxbitmap_free(dev
, ctx
->handle
);
484 mutex_lock(&dev
->ctxlist_mutex
);
485 if (!list_empty(&dev
->ctxlist
)) {
486 struct drm_ctx_list
*pos
, *n
;
488 list_for_each_entry_safe(pos
, n
, &dev
->ctxlist
, head
) {
489 if (pos
->handle
== ctx
->handle
) {
490 list_del(&pos
->head
);
496 mutex_unlock(&dev
->ctxlist_mutex
);
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