1 /* drm_context.h -- IOCTLs for generic contexts -*- linux-c -*-
2 * Created: Fri Nov 24 18:31:37 2000 by gareth@valinux.com
5 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
6 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
16 * The above copyright notice and this permission notice (including the next
17 * paragraph) shall be included in all copies or substantial portions of the
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
24 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
26 * OTHER DEALINGS IN THE SOFTWARE.
29 * Rickard E. (Rik) Faith <faith@valinux.com>
30 * Gareth Hughes <gareth@valinux.com>
35 #include "dev/drm/drmP.h"
37 /* ================================================================
38 * Context bitmap support
41 void drm_ctxbitmap_free(drm_device_t *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(drm_device_t *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(drm_device_t *dev)
110 dev->ctx_bitmap = malloc(PAGE_SIZE, M_DRM, M_NOWAIT | M_ZERO);
111 if ( dev->ctx_bitmap == NULL ) {
113 return DRM_ERR(ENOMEM);
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(drm_device_t *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( DRM_IOCTL_ARGS )
143 drm_ctx_priv_map_t request;
144 drm_local_map_t *map;
146 DRM_COPY_FROM_USER_IOCTL( request, (drm_ctx_priv_map_t *)data,
150 if (dev->max_context < 0 || request.ctx_id >= (unsigned) dev->max_context) {
152 return DRM_ERR(EINVAL);
155 map = dev->context_sareas[request.ctx_id];
158 request.handle = map->handle;
160 DRM_COPY_TO_USER_IOCTL( (drm_ctx_priv_map_t *)data, request, sizeof(request) );
165 int drm_setsareactx( DRM_IOCTL_ARGS )
168 drm_ctx_priv_map_t request;
169 drm_local_map_t *map = NULL;
171 DRM_COPY_FROM_USER_IOCTL( request, (drm_ctx_priv_map_t *)data,
175 TAILQ_FOREACH(map, &dev->maplist, link) {
176 if (map->handle == request.handle) {
177 if (dev->max_context < 0)
179 if (request.ctx_id >= (unsigned) dev->max_context)
181 dev->context_sareas[request.ctx_id] = map;
189 return DRM_ERR(EINVAL);
192 /* ================================================================
193 * The actual DRM context handling routines
196 int drm_context_switch(drm_device_t *dev, int old, int new)
198 if ( test_and_set_bit( 0, &dev->context_flag ) ) {
199 DRM_ERROR( "Reentering -- FIXME\n" );
200 return DRM_ERR(EBUSY);
203 DRM_DEBUG( "Context switch from %d to %d\n", old, new );
205 if ( new == dev->last_context ) {
206 clear_bit( 0, &dev->context_flag );
213 int drm_context_switch_complete(drm_device_t *dev, int new)
215 dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
217 if ( !_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) ) {
218 DRM_ERROR( "Lock isn't held after context switch\n" );
221 /* If a context switch is ever initiated
222 when the kernel holds the lock, release
224 clear_bit( 0, &dev->context_flag );
229 int drm_resctx(DRM_IOCTL_ARGS)
234 DRM_COPY_FROM_USER_IOCTL( res, (drm_ctx_res_t *)data, sizeof(res) );
236 if ( res.count >= DRM_RESERVED_CONTEXTS ) {
237 for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; i++ ) {
238 if ( DRM_COPY_TO_USER( &res.contexts[i],
240 return DRM_ERR(EFAULT);
243 res.count = DRM_RESERVED_CONTEXTS;
245 DRM_COPY_TO_USER_IOCTL( (drm_ctx_res_t *)data, res, sizeof(res) );
250 int drm_addctx(DRM_IOCTL_ARGS)
255 DRM_COPY_FROM_USER_IOCTL( ctx, (drm_ctx_t *)data, sizeof(ctx) );
257 ctx.handle = drm_ctxbitmap_next(dev);
258 if ( ctx.handle == DRM_KERNEL_CONTEXT ) {
259 /* Skip kernel's context and get a new one. */
260 ctx.handle = drm_ctxbitmap_next(dev);
262 DRM_DEBUG( "%d\n", ctx.handle );
263 if ( ctx.handle == -1 ) {
264 DRM_DEBUG( "Not enough free contexts.\n" );
265 /* Should this return -EBUSY instead? */
266 return DRM_ERR(ENOMEM);
269 if (dev->context_ctor && ctx.handle != DRM_KERNEL_CONTEXT) {
271 dev->context_ctor(dev, ctx.handle);
275 DRM_COPY_TO_USER_IOCTL( (drm_ctx_t *)data, ctx, sizeof(ctx) );
280 int drm_modctx(DRM_IOCTL_ARGS)
282 /* This does nothing */
286 int drm_getctx(DRM_IOCTL_ARGS)
290 DRM_COPY_FROM_USER_IOCTL( ctx, (drm_ctx_t *)data, sizeof(ctx) );
292 /* This is 0, because we don't handle any context flags */
295 DRM_COPY_TO_USER_IOCTL( (drm_ctx_t *)data, ctx, sizeof(ctx) );
300 int drm_switchctx(DRM_IOCTL_ARGS)
305 DRM_COPY_FROM_USER_IOCTL( ctx, (drm_ctx_t *)data, sizeof(ctx) );
307 DRM_DEBUG( "%d\n", ctx.handle );
308 return drm_context_switch(dev, dev->last_context, ctx.handle);
311 int drm_newctx(DRM_IOCTL_ARGS)
316 DRM_COPY_FROM_USER_IOCTL( ctx, (drm_ctx_t *)data, sizeof(ctx) );
318 DRM_DEBUG( "%d\n", ctx.handle );
319 drm_context_switch_complete(dev, ctx.handle);
324 int drm_rmctx(DRM_IOCTL_ARGS)
329 DRM_COPY_FROM_USER_IOCTL( ctx, (drm_ctx_t *)data, sizeof(ctx) );
331 DRM_DEBUG( "%d\n", ctx.handle );
332 if ( ctx.handle != DRM_KERNEL_CONTEXT ) {
333 if (dev->context_dtor) {
335 dev->context_dtor(dev, ctx.handle);
339 drm_ctxbitmap_free(dev, ctx.handle);