2 * Legacy: Generic DRM Contexts
4 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
5 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
8 * Author: Rickard E. (Rik) Faith <faith@valinux.com>
9 * Author: Gareth Hughes <gareth@valinux.com>
11 * Permission is hereby granted, free of charge, to any person obtaining a
12 * copy of this software and associated documentation files (the "Software"),
13 * to deal in the Software without restriction, including without limitation
14 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
15 * and/or sell copies of the Software, and to permit persons to whom the
16 * Software is furnished to do so, subject to the following conditions:
18 * The above copyright notice and this permission notice (including the next
19 * paragraph) shall be included in all copies or substantial portions of the
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
25 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
26 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
27 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
28 * OTHER DEALINGS IN THE SOFTWARE.
32 #include "drm_legacy.h"
35 struct list_head head
;
40 /******************************************************************/
41 /** \name Context bitmap support */
45 * Free a handle from the context bitmap.
47 * \param dev DRM device.
48 * \param ctx_handle context handle.
50 * Clears the bit specified by \p ctx_handle in drm_device::ctx_bitmap and the entry
51 * in drm_device::ctx_idr, while holding the drm_device::struct_mutex
54 void drm_legacy_ctxbitmap_free(struct drm_device
* dev
, int ctx_handle
)
56 if (!drm_core_check_feature(dev
, DRIVER_KMS_LEGACY_CONTEXT
) &&
57 !drm_core_check_feature(dev
, DRIVER_LEGACY
))
60 mutex_lock(&dev
->struct_mutex
);
61 idr_remove(&dev
->ctx_idr
, ctx_handle
);
62 mutex_unlock(&dev
->struct_mutex
);
66 * Context bitmap allocation.
68 * \param dev DRM device.
69 * \return (non-negative) context handle on success or a negative number on failure.
71 * Allocate a new idr from drm_device::ctx_idr while holding the
72 * drm_device::struct_mutex lock.
74 static int drm_legacy_ctxbitmap_next(struct drm_device
* dev
)
78 mutex_lock(&dev
->struct_mutex
);
79 ret
= idr_alloc(&dev
->ctx_idr
, NULL
, DRM_RESERVED_CONTEXTS
, 0,
81 mutex_unlock(&dev
->struct_mutex
);
86 * Context bitmap initialization.
88 * \param dev DRM device.
90 * Initialise the drm_device::ctx_idr
92 void drm_legacy_ctxbitmap_init(struct drm_device
* dev
)
94 if (!drm_core_check_feature(dev
, DRIVER_KMS_LEGACY_CONTEXT
) &&
95 !drm_core_check_feature(dev
, DRIVER_LEGACY
))
98 idr_init(&dev
->ctx_idr
);
102 * Context bitmap cleanup.
104 * \param dev DRM device.
106 * Free all idr members using drm_ctx_sarea_free helper function
107 * while holding the drm_device::struct_mutex lock.
109 void drm_legacy_ctxbitmap_cleanup(struct drm_device
* dev
)
111 if (!drm_core_check_feature(dev
, DRIVER_KMS_LEGACY_CONTEXT
) &&
112 !drm_core_check_feature(dev
, DRIVER_LEGACY
))
115 mutex_lock(&dev
->struct_mutex
);
116 idr_destroy(&dev
->ctx_idr
);
117 mutex_unlock(&dev
->struct_mutex
);
121 * drm_ctxbitmap_flush() - Flush all contexts owned by a file
122 * @dev: DRM device to operate on
123 * @file: Open file to flush contexts for
125 * This iterates over all contexts on @dev and drops them if they're owned by
126 * @file. Note that after this call returns, new contexts might be added if
127 * the file is still alive.
129 void drm_legacy_ctxbitmap_flush(struct drm_device
*dev
, struct drm_file
*file
)
131 struct drm_ctx_list
*pos
, *tmp
;
133 if (!drm_core_check_feature(dev
, DRIVER_KMS_LEGACY_CONTEXT
) &&
134 !drm_core_check_feature(dev
, DRIVER_LEGACY
))
137 mutex_lock(&dev
->ctxlist_mutex
);
139 list_for_each_entry_safe(pos
, tmp
, &dev
->ctxlist
, head
) {
140 if (pos
->tag
== file
&&
141 pos
->handle
!= DRM_KERNEL_CONTEXT
) {
142 if (dev
->driver
->context_dtor
)
143 dev
->driver
->context_dtor(dev
, pos
->handle
);
145 drm_legacy_ctxbitmap_free(dev
, pos
->handle
);
146 list_del(&pos
->head
);
151 mutex_unlock(&dev
->ctxlist_mutex
);
156 /******************************************************************/
157 /** \name Per Context SAREA Support */
161 * Get per-context SAREA.
163 * \param inode device inode.
164 * \param file_priv DRM file private.
165 * \param cmd command.
166 * \param arg user argument pointing to a drm_ctx_priv_map structure.
167 * \return zero on success or a negative number on failure.
169 * Gets the map from drm_device::ctx_idr with the handle specified and
170 * returns its handle.
172 int drm_legacy_getsareactx(struct drm_device
*dev
, void *data
,
173 struct drm_file
*file_priv
)
175 struct drm_ctx_priv_map
*request
= data
;
176 struct drm_local_map
*map
;
177 struct drm_map_list
*_entry
;
179 if (!drm_core_check_feature(dev
, DRIVER_KMS_LEGACY_CONTEXT
) &&
180 !drm_core_check_feature(dev
, DRIVER_LEGACY
))
183 mutex_lock(&dev
->struct_mutex
);
185 map
= idr_find(&dev
->ctx_idr
, request
->ctx_id
);
187 mutex_unlock(&dev
->struct_mutex
);
191 request
->handle
= NULL
;
192 list_for_each_entry(_entry
, &dev
->maplist
, head
) {
193 if (_entry
->map
== map
) {
195 (void *)(unsigned long)_entry
->user_token
;
200 mutex_unlock(&dev
->struct_mutex
);
202 if (request
->handle
== NULL
)
209 * Set per-context SAREA.
211 * \param inode device inode.
212 * \param file_priv DRM file private.
213 * \param cmd command.
214 * \param arg user argument pointing to a drm_ctx_priv_map structure.
215 * \return zero on success or a negative number on failure.
217 * Searches the mapping specified in \p arg and update the entry in
218 * drm_device::ctx_idr with it.
220 int drm_legacy_setsareactx(struct drm_device
*dev
, void *data
,
221 struct drm_file
*file_priv
)
223 struct drm_ctx_priv_map
*request
= data
;
224 struct drm_local_map
*map
= NULL
;
225 struct drm_map_list
*r_list
= NULL
;
227 if (!drm_core_check_feature(dev
, DRIVER_KMS_LEGACY_CONTEXT
) &&
228 !drm_core_check_feature(dev
, DRIVER_LEGACY
))
231 mutex_lock(&dev
->struct_mutex
);
232 list_for_each_entry(r_list
, &dev
->maplist
, head
) {
234 && r_list
->user_token
== (unsigned long) request
->handle
)
238 mutex_unlock(&dev
->struct_mutex
);
246 if (IS_ERR(idr_replace(&dev
->ctx_idr
, map
, request
->ctx_id
)))
249 mutex_unlock(&dev
->struct_mutex
);
256 /******************************************************************/
257 /** \name The actual DRM context handling routines */
263 * \param dev DRM device.
264 * \param old old context handle.
265 * \param new new context handle.
266 * \return zero on success or a negative number on failure.
268 * Attempt to set drm_device::context_flag.
270 static int drm_context_switch(struct drm_device
* dev
, int old
, int new)
272 if (test_and_set_bit(0, &dev
->context_flag
)) {
273 DRM_ERROR("Reentering -- FIXME\n");
277 DRM_DEBUG("Context switch from %d to %d\n", old
, new);
279 if (new == dev
->last_context
) {
280 clear_bit(0, &dev
->context_flag
);
288 * Complete context switch.
290 * \param dev DRM device.
291 * \param new new context handle.
292 * \return zero on success or a negative number on failure.
294 * Updates drm_device::last_context and drm_device::last_switch. Verifies the
295 * hardware lock is held, clears the drm_device::context_flag and wakes up
296 * drm_device::context_wait.
298 static int drm_context_switch_complete(struct drm_device
*dev
,
299 struct drm_file
*file_priv
, int new)
301 dev
->last_context
= new; /* PRE/POST: This is the _only_ writer. */
303 if (!_DRM_LOCK_IS_HELD(file_priv
->master
->lock
.hw_lock
->lock
)) {
304 DRM_ERROR("Lock isn't held after context switch\n");
307 /* If a context switch is ever initiated
308 when the kernel holds the lock, release
310 clear_bit(0, &dev
->context_flag
);
318 * \param inode device inode.
319 * \param file_priv DRM file private.
320 * \param cmd command.
321 * \param arg user argument pointing to a drm_ctx_res structure.
322 * \return zero on success or a negative number on failure.
324 int drm_legacy_resctx(struct drm_device
*dev
, void *data
,
325 struct drm_file
*file_priv
)
327 struct drm_ctx_res
*res
= data
;
331 if (!drm_core_check_feature(dev
, DRIVER_KMS_LEGACY_CONTEXT
) &&
332 !drm_core_check_feature(dev
, DRIVER_LEGACY
))
335 if (res
->count
>= DRM_RESERVED_CONTEXTS
) {
336 memset(&ctx
, 0, sizeof(ctx
));
337 for (i
= 0; i
< DRM_RESERVED_CONTEXTS
; i
++) {
339 if (copy_to_user(&res
->contexts
[i
], &ctx
, sizeof(ctx
)))
343 res
->count
= DRM_RESERVED_CONTEXTS
;
351 * \param inode device inode.
352 * \param file_priv DRM file private.
353 * \param cmd command.
354 * \param arg user argument pointing to a drm_ctx structure.
355 * \return zero on success or a negative number on failure.
357 * Get a new handle for the context and copy to userspace.
359 int drm_legacy_addctx(struct drm_device
*dev
, void *data
,
360 struct drm_file
*file_priv
)
362 struct drm_ctx_list
*ctx_entry
;
363 struct drm_ctx
*ctx
= data
;
365 if (!drm_core_check_feature(dev
, DRIVER_KMS_LEGACY_CONTEXT
) &&
366 !drm_core_check_feature(dev
, DRIVER_LEGACY
))
369 ctx
->handle
= drm_legacy_ctxbitmap_next(dev
);
370 if (ctx
->handle
== DRM_KERNEL_CONTEXT
) {
371 /* Skip kernel's context and get a new one. */
372 ctx
->handle
= drm_legacy_ctxbitmap_next(dev
);
374 DRM_DEBUG("%d\n", ctx
->handle
);
375 if (ctx
->handle
== -1) {
376 DRM_DEBUG("Not enough free contexts.\n");
377 /* Should this return -EBUSY instead? */
381 ctx_entry
= kmalloc(sizeof(*ctx_entry
), M_DRM
, GFP_KERNEL
);
383 DRM_DEBUG("out of memory\n");
387 INIT_LIST_HEAD(&ctx_entry
->head
);
388 ctx_entry
->handle
= ctx
->handle
;
389 ctx_entry
->tag
= file_priv
;
391 mutex_lock(&dev
->ctxlist_mutex
);
392 list_add(&ctx_entry
->head
, &dev
->ctxlist
);
393 mutex_unlock(&dev
->ctxlist_mutex
);
401 * \param inode device inode.
402 * \param file_priv DRM file private.
403 * \param cmd command.
404 * \param arg user argument pointing to a drm_ctx structure.
405 * \return zero on success or a negative number on failure.
407 int drm_legacy_getctx(struct drm_device
*dev
, void *data
,
408 struct drm_file
*file_priv
)
410 struct drm_ctx
*ctx
= data
;
412 if (!drm_core_check_feature(dev
, DRIVER_KMS_LEGACY_CONTEXT
) &&
413 !drm_core_check_feature(dev
, DRIVER_LEGACY
))
416 /* This is 0, because we don't handle any context flags */
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 * Calls context_switch().
433 int drm_legacy_switchctx(struct drm_device
*dev
, void *data
,
434 struct drm_file
*file_priv
)
436 struct drm_ctx
*ctx
= data
;
438 if (!drm_core_check_feature(dev
, DRIVER_KMS_LEGACY_CONTEXT
) &&
439 !drm_core_check_feature(dev
, DRIVER_LEGACY
))
442 DRM_DEBUG("%d\n", ctx
->handle
);
443 return drm_context_switch(dev
, dev
->last_context
, ctx
->handle
);
449 * \param inode device inode.
450 * \param file_priv DRM file private.
451 * \param cmd command.
452 * \param arg user argument pointing to a drm_ctx structure.
453 * \return zero on success or a negative number on failure.
455 * Calls context_switch_complete().
457 int drm_legacy_newctx(struct drm_device
*dev
, void *data
,
458 struct drm_file
*file_priv
)
460 struct drm_ctx
*ctx
= data
;
462 if (!drm_core_check_feature(dev
, DRIVER_KMS_LEGACY_CONTEXT
) &&
463 !drm_core_check_feature(dev
, DRIVER_LEGACY
))
466 DRM_DEBUG("%d\n", ctx
->handle
);
467 drm_context_switch_complete(dev
, file_priv
, ctx
->handle
);
475 * \param inode device inode.
476 * \param file_priv DRM file private.
477 * \param cmd command.
478 * \param arg user argument pointing to a drm_ctx structure.
479 * \return zero on success or a negative number on failure.
481 * If not the special kernel context, calls ctxbitmap_free() to free the specified context.
483 int drm_legacy_rmctx(struct drm_device
*dev
, void *data
,
484 struct drm_file
*file_priv
)
486 struct drm_ctx
*ctx
= data
;
488 if (!drm_core_check_feature(dev
, DRIVER_KMS_LEGACY_CONTEXT
) &&
489 !drm_core_check_feature(dev
, DRIVER_LEGACY
))
492 DRM_DEBUG("%d\n", ctx
->handle
);
493 if (ctx
->handle
!= DRM_KERNEL_CONTEXT
) {
494 if (dev
->driver
->context_dtor
)
495 dev
->driver
->context_dtor(dev
, ctx
->handle
);
496 drm_legacy_ctxbitmap_free(dev
, ctx
->handle
);
499 mutex_lock(&dev
->ctxlist_mutex
);
500 if (!list_empty(&dev
->ctxlist
)) {
501 struct drm_ctx_list
*pos
, *n
;
503 list_for_each_entry_safe(pos
, n
, &dev
->ctxlist
, head
) {
504 if (pos
->handle
== ctx
->handle
) {
505 list_del(&pos
->head
);
510 mutex_unlock(&dev
->ctxlist_mutex
);