42da33c444
of the infrastructure for the gamma driver which was removed a while back. The DRM_LINUX option is removed because the handler is now provided by the linux compat code itself.
348 lines
8.4 KiB
C
348 lines
8.4 KiB
C
/* drm_context.h -- IOCTLs for generic contexts -*- linux-c -*-
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* Created: Fri Nov 24 18:31:37 2000 by gareth@valinux.com
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*
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* Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Rickard E. (Rik) Faith <faith@valinux.com>
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* Gareth Hughes <gareth@valinux.com>
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* $FreeBSD$
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*/
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#include "dev/drm/drmP.h"
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#if !__HAVE_CTX_BITMAP
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#error "__HAVE_CTX_BITMAP must be defined"
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#endif
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/* ================================================================
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* Context bitmap support
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*/
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void DRM(ctxbitmap_free)( drm_device_t *dev, int ctx_handle )
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{
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if ( ctx_handle < 0 ) goto failed;
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if ( !dev->ctx_bitmap ) goto failed;
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if ( ctx_handle < DRM_MAX_CTXBITMAP ) {
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DRM_LOCK;
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clear_bit( ctx_handle, dev->ctx_bitmap );
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dev->context_sareas[ctx_handle] = NULL;
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DRM_UNLOCK;
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return;
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}
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failed:
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DRM_ERROR( "Attempt to free invalid context handle: %d\n",
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ctx_handle );
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return;
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}
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int DRM(ctxbitmap_next)( drm_device_t *dev )
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{
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int bit;
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if(!dev->ctx_bitmap) return -1;
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DRM_LOCK;
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bit = find_first_zero_bit( dev->ctx_bitmap, DRM_MAX_CTXBITMAP );
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if ( bit < DRM_MAX_CTXBITMAP ) {
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set_bit( bit, dev->ctx_bitmap );
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DRM_DEBUG( "drm_ctxbitmap_next bit : %d\n", bit );
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if((bit+1) > dev->max_context) {
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dev->max_context = (bit+1);
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if(dev->context_sareas) {
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drm_local_map_t **ctx_sareas;
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ctx_sareas = DRM(realloc)(dev->context_sareas,
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(dev->max_context - 1) *
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sizeof(*dev->context_sareas),
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dev->max_context *
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sizeof(*dev->context_sareas),
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DRM_MEM_MAPS);
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if(!ctx_sareas) {
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clear_bit(bit, dev->ctx_bitmap);
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DRM_UNLOCK;
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return -1;
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}
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dev->context_sareas = ctx_sareas;
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dev->context_sareas[bit] = NULL;
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} else {
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/* max_context == 1 at this point */
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dev->context_sareas = DRM(alloc)(
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dev->max_context *
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sizeof(*dev->context_sareas),
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DRM_MEM_MAPS);
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if(!dev->context_sareas) {
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clear_bit(bit, dev->ctx_bitmap);
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DRM_UNLOCK;
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return -1;
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}
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dev->context_sareas[bit] = NULL;
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}
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}
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DRM_UNLOCK;
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return bit;
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}
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DRM_UNLOCK;
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return -1;
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}
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int DRM(ctxbitmap_init)( drm_device_t *dev )
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{
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int i;
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int temp;
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DRM_LOCK;
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dev->ctx_bitmap = (atomic_t *) DRM(alloc)( PAGE_SIZE,
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DRM_MEM_CTXBITMAP );
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if ( dev->ctx_bitmap == NULL ) {
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DRM_UNLOCK;
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return DRM_ERR(ENOMEM);
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}
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memset( (void *)dev->ctx_bitmap, 0, PAGE_SIZE );
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dev->context_sareas = NULL;
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dev->max_context = -1;
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DRM_UNLOCK;
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for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; i++ ) {
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temp = DRM(ctxbitmap_next)( dev );
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DRM_DEBUG( "drm_ctxbitmap_init : %d\n", temp );
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}
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return 0;
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}
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void DRM(ctxbitmap_cleanup)( drm_device_t *dev )
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{
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DRM_LOCK;
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if( dev->context_sareas ) DRM(free)( dev->context_sareas,
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sizeof(*dev->context_sareas) *
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dev->max_context,
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DRM_MEM_MAPS );
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DRM(free)( (void *)dev->ctx_bitmap, PAGE_SIZE, DRM_MEM_CTXBITMAP );
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DRM_UNLOCK;
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}
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/* ================================================================
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* Per Context SAREA Support
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*/
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int DRM(getsareactx)( DRM_IOCTL_ARGS )
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{
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DRM_DEVICE;
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drm_ctx_priv_map_t request;
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drm_local_map_t *map;
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DRM_COPY_FROM_USER_IOCTL( request, (drm_ctx_priv_map_t *)data,
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sizeof(request) );
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DRM_LOCK;
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if (dev->max_context < 0 || request.ctx_id >= (unsigned) dev->max_context) {
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DRM_UNLOCK;
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return DRM_ERR(EINVAL);
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}
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map = dev->context_sareas[request.ctx_id];
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DRM_UNLOCK;
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request.handle = map->handle;
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DRM_COPY_TO_USER_IOCTL( (drm_ctx_priv_map_t *)data, request, sizeof(request) );
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return 0;
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}
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int DRM(setsareactx)( DRM_IOCTL_ARGS )
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{
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DRM_DEVICE;
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drm_ctx_priv_map_t request;
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drm_local_map_t *map = NULL;
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drm_map_list_entry_t *list;
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DRM_COPY_FROM_USER_IOCTL( request, (drm_ctx_priv_map_t *)data,
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sizeof(request) );
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DRM_LOCK;
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TAILQ_FOREACH(list, dev->maplist, link) {
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map=list->map;
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if(map->handle == request.handle) {
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if (dev->max_context < 0)
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goto bad;
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if (request.ctx_id >= (unsigned) dev->max_context)
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goto bad;
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dev->context_sareas[request.ctx_id] = map;
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DRM_UNLOCK;
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return 0;
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}
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}
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bad:
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DRM_UNLOCK;
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return DRM_ERR(EINVAL);
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}
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/* ================================================================
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* The actual DRM context handling routines
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*/
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int DRM(context_switch)( drm_device_t *dev, int old, int new )
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{
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if ( test_and_set_bit( 0, &dev->context_flag ) ) {
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DRM_ERROR( "Reentering -- FIXME\n" );
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return DRM_ERR(EBUSY);
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}
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DRM_DEBUG( "Context switch from %d to %d\n", old, new );
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if ( new == dev->last_context ) {
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clear_bit( 0, &dev->context_flag );
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return 0;
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}
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return 0;
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}
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int DRM(context_switch_complete)( drm_device_t *dev, int new )
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{
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dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
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if ( !_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) ) {
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DRM_ERROR( "Lock isn't held after context switch\n" );
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}
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/* If a context switch is ever initiated
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when the kernel holds the lock, release
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that lock here. */
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clear_bit( 0, &dev->context_flag );
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return 0;
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}
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int DRM(resctx)( DRM_IOCTL_ARGS )
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{
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drm_ctx_res_t res;
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drm_ctx_t ctx;
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int i;
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DRM_COPY_FROM_USER_IOCTL( res, (drm_ctx_res_t *)data, sizeof(res) );
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if ( res.count >= DRM_RESERVED_CONTEXTS ) {
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memset( &ctx, 0, sizeof(ctx) );
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for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; i++ ) {
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ctx.handle = i;
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if ( DRM_COPY_TO_USER( &res.contexts[i],
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&i, sizeof(i) ) )
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return DRM_ERR(EFAULT);
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}
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}
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res.count = DRM_RESERVED_CONTEXTS;
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DRM_COPY_TO_USER_IOCTL( (drm_ctx_res_t *)data, res, sizeof(res) );
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return 0;
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}
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int DRM(addctx)( DRM_IOCTL_ARGS )
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{
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DRM_DEVICE;
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drm_ctx_t ctx;
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DRM_COPY_FROM_USER_IOCTL( ctx, (drm_ctx_t *)data, sizeof(ctx) );
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ctx.handle = DRM(ctxbitmap_next)( dev );
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if ( ctx.handle == DRM_KERNEL_CONTEXT ) {
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/* Skip kernel's context and get a new one. */
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ctx.handle = DRM(ctxbitmap_next)( dev );
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}
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DRM_DEBUG( "%d\n", ctx.handle );
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if ( ctx.handle == -1 ) {
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DRM_DEBUG( "Not enough free contexts.\n" );
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/* Should this return -EBUSY instead? */
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return DRM_ERR(ENOMEM);
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}
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DRM_COPY_TO_USER_IOCTL( (drm_ctx_t *)data, ctx, sizeof(ctx) );
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return 0;
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}
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int DRM(modctx)( DRM_IOCTL_ARGS )
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{
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/* This does nothing */
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return 0;
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}
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int DRM(getctx)( DRM_IOCTL_ARGS )
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{
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drm_ctx_t ctx;
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DRM_COPY_FROM_USER_IOCTL( ctx, (drm_ctx_t *)data, sizeof(ctx) );
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/* This is 0, because we don't handle any context flags */
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ctx.flags = 0;
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DRM_COPY_TO_USER_IOCTL( (drm_ctx_t *)data, ctx, sizeof(ctx) );
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return 0;
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}
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int DRM(switchctx)( DRM_IOCTL_ARGS )
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{
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DRM_DEVICE;
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drm_ctx_t ctx;
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DRM_COPY_FROM_USER_IOCTL( ctx, (drm_ctx_t *)data, sizeof(ctx) );
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DRM_DEBUG( "%d\n", ctx.handle );
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return DRM(context_switch)( dev, dev->last_context, ctx.handle );
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}
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int DRM(newctx)( DRM_IOCTL_ARGS )
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{
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DRM_DEVICE;
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drm_ctx_t ctx;
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DRM_COPY_FROM_USER_IOCTL( ctx, (drm_ctx_t *)data, sizeof(ctx) );
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DRM_DEBUG( "%d\n", ctx.handle );
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DRM(context_switch_complete)( dev, ctx.handle );
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return 0;
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}
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int DRM(rmctx)( DRM_IOCTL_ARGS )
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{
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DRM_DEVICE;
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drm_ctx_t ctx;
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DRM_COPY_FROM_USER_IOCTL( ctx, (drm_ctx_t *)data, sizeof(ctx) );
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DRM_DEBUG( "%d\n", ctx.handle );
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if ( ctx.handle != DRM_KERNEL_CONTEXT ) {
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DRM(ctxbitmap_free)( dev, ctx.handle );
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}
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return 0;
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}
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