2 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
3 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
26 * Rickard E. (Rik) Faith <faith@valinux.com>
27 * Gareth Hughes <gareth@valinux.com>
31 /** @file drm_context.c
32 * Implementation of the context management ioctls.
37 /* ================================================================
38 * Context bitmap support
41 void drm_ctxbitmap_free(struct drm_device *dev, int ctx_handle)
43 if (ctx_handle < 0 || ctx_handle >= DRM_MAX_CTXBITMAP ||
44 dev->ctx_bitmap == NULL) {
45 DRM_ERROR("Attempt to free invalid context handle: %d\n",
51 clear_bit(ctx_handle, dev->ctx_bitmap);
52 dev->context_sareas[ctx_handle] = NULL;
57 int drm_ctxbitmap_next(struct drm_device *dev)
61 if (dev->ctx_bitmap == NULL)
65 bit = find_first_zero_bit( dev->ctx_bitmap, DRM_MAX_CTXBITMAP );
66 if (bit >= DRM_MAX_CTXBITMAP) {
71 set_bit(bit, dev->ctx_bitmap);
72 DRM_DEBUG("drm_ctxbitmap_next bit : %d\n", bit);
73 if ((bit+1) > dev->max_context) {
74 dev->max_context = (bit+1);
75 if (dev->context_sareas != NULL) {
76 drm_local_map_t **ctx_sareas;
78 ctx_sareas = realloc(dev->context_sareas,
79 dev->max_context * sizeof(*dev->context_sareas),
81 if (ctx_sareas == NULL) {
82 clear_bit(bit, dev->ctx_bitmap);
86 dev->context_sareas = ctx_sareas;
87 dev->context_sareas[bit] = NULL;
89 /* max_context == 1 at this point */
90 dev->context_sareas = malloc(dev->max_context *
91 sizeof(*dev->context_sareas), M_DRM, M_NOWAIT);
92 if (dev->context_sareas == NULL) {
93 clear_bit(bit, dev->ctx_bitmap);
97 dev->context_sareas[bit] = NULL;
104 int drm_ctxbitmap_init(struct drm_device *dev)
110 dev->ctx_bitmap = malloc(PAGE_SIZE, M_DRM, M_NOWAIT | M_ZERO);
111 if ( dev->ctx_bitmap == NULL ) {
115 dev->context_sareas = NULL;
116 dev->max_context = -1;
119 for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; i++ ) {
120 temp = drm_ctxbitmap_next(dev);
121 DRM_DEBUG( "drm_ctxbitmap_init : %d\n", temp );
127 void drm_ctxbitmap_cleanup(struct drm_device *dev)
130 if (dev->context_sareas != NULL)
131 free(dev->context_sareas, M_DRM);
132 free(dev->ctx_bitmap, M_DRM);
136 /* ================================================================
137 * Per Context SAREA Support
140 int drm_getsareactx(struct drm_device *dev, void *data,
141 struct drm_file *file_priv)
143 drm_ctx_priv_map_t *request = data;
144 drm_local_map_t *map;
147 if (dev->max_context < 0 ||
148 request->ctx_id >= (unsigned) dev->max_context) {
153 map = dev->context_sareas[request->ctx_id];
156 request->handle = map->handle;
161 int drm_setsareactx(struct drm_device *dev, void *data,
162 struct drm_file *file_priv)
164 drm_ctx_priv_map_t *request = data;
165 drm_local_map_t *map = NULL;
168 TAILQ_FOREACH(map, &dev->maplist, link) {
169 if (map->handle == request->handle) {
170 if (dev->max_context < 0)
172 if (request->ctx_id >= (unsigned) dev->max_context)
174 dev->context_sareas[request->ctx_id] = map;
185 /* ================================================================
186 * The actual DRM context handling routines
189 int drm_context_switch(struct drm_device *dev, int old, int new)
191 if ( test_and_set_bit( 0, &dev->context_flag ) ) {
192 DRM_ERROR( "Reentering -- FIXME\n" );
196 DRM_DEBUG( "Context switch from %d to %d\n", old, new );
198 if ( new == dev->last_context ) {
199 clear_bit( 0, &dev->context_flag );
206 int drm_context_switch_complete(struct drm_device *dev, int new)
208 dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
210 if ( !_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) ) {
211 DRM_ERROR( "Lock isn't held after context switch\n" );
214 /* If a context switch is ever initiated
215 when the kernel holds the lock, release
217 clear_bit( 0, &dev->context_flag );
222 int drm_resctx(struct drm_device *dev, void *data, struct drm_file *file_priv)
224 drm_ctx_res_t *res = data;
228 if ( res->count >= DRM_RESERVED_CONTEXTS ) {
229 bzero(&ctx, sizeof(ctx));
230 for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; i++ ) {
232 if ( DRM_COPY_TO_USER( &res->contexts[i],
233 &ctx, sizeof(ctx) ) )
237 res->count = DRM_RESERVED_CONTEXTS;
242 int drm_addctx(struct drm_device *dev, void *data, struct drm_file *file_priv)
244 drm_ctx_t *ctx = data;
246 ctx->handle = drm_ctxbitmap_next(dev);
247 if ( ctx->handle == DRM_KERNEL_CONTEXT ) {
248 /* Skip kernel's context and get a new one. */
249 ctx->handle = drm_ctxbitmap_next(dev);
251 DRM_DEBUG( "%d\n", ctx->handle );
252 if ( ctx->handle == -1 ) {
253 DRM_DEBUG( "Not enough free contexts.\n" );
254 /* Should this return -EBUSY instead? */
258 if (dev->driver.context_ctor && ctx->handle != DRM_KERNEL_CONTEXT) {
260 dev->driver.context_ctor(dev, ctx->handle);
267 int drm_modctx(struct drm_device *dev, void *data, struct drm_file *file_priv)
269 /* This does nothing */
273 int drm_getctx(struct drm_device *dev, void *data, struct drm_file *file_priv)
275 drm_ctx_t *ctx = data;
277 /* This is 0, because we don't handle any context flags */
283 int drm_switchctx(struct drm_device *dev, void *data,
284 struct drm_file *file_priv)
286 drm_ctx_t *ctx = data;
288 DRM_DEBUG( "%d\n", ctx->handle );
289 return drm_context_switch(dev, dev->last_context, ctx->handle);
292 int drm_newctx(struct drm_device *dev, void *data, struct drm_file *file_priv)
294 drm_ctx_t *ctx = data;
296 DRM_DEBUG( "%d\n", ctx->handle );
297 drm_context_switch_complete(dev, ctx->handle);
302 int drm_rmctx(struct drm_device *dev, void *data, struct drm_file *file_priv)
304 drm_ctx_t *ctx = data;
306 DRM_DEBUG( "%d\n", ctx->handle );
307 if ( ctx->handle != DRM_KERNEL_CONTEXT ) {
308 if (dev->driver.context_dtor) {
310 dev->driver.context_dtor(dev, ctx->handle);
314 drm_ctxbitmap_free(dev, ctx->handle);