781 lines
18 KiB
C
781 lines
18 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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*
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* $FreeBSD$
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*/
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#define __NO_VERSION__
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#include "dev/drm/drmP.h"
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#if __HAVE_CTX_BITMAP
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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_OS_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_OS_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_OS_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_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_OS_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_OS_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_OS_UNLOCK;
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return bit;
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}
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DRM_OS_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_OS_LOCK;
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dev->ctx_bitmap = (unsigned long *) 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_OS_UNLOCK;
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return DRM_OS_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_OS_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_OS_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_OS_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_OS_IOCTL )
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{
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DRM_OS_DEVICE;
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drm_ctx_priv_map_t request;
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drm_map_t *map;
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DRM_OS_KRNFROMUSR( request, (drm_ctx_priv_map_t *)data,
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sizeof(request) );
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DRM_OS_LOCK;
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if (dev->max_context < 0 || request.ctx_id >= (unsigned) dev->max_context) {
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DRM_OS_UNLOCK;
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return DRM_OS_ERR(EINVAL);
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}
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map = dev->context_sareas[request.ctx_id];
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DRM_OS_UNLOCK;
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request.handle = map->handle;
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DRM_OS_KRNTOUSR( (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_OS_IOCTL )
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{
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DRM_OS_DEVICE;
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drm_ctx_priv_map_t request;
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drm_map_t *map = NULL;
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#ifdef __linux__
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drm_map_list_t *r_list = NULL;
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struct list_head *list;
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#endif /* __linux__ */
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#ifdef __FreeBSD__
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drm_map_list_entry_t *list;
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#endif /* __FreeBSD__ */
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DRM_OS_KRNFROMUSR( request, (drm_ctx_priv_map_t *)data,
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sizeof(request) );
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DRM_OS_LOCK;
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#ifdef __linux__
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list_for_each(list, &dev->maplist->head) {
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r_list = (drm_map_list_t *)list;
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if(r_list->map &&
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r_list->map->handle == request.handle)
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goto found;
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}
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#endif /* __linux__ */
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#ifdef __FreeBSD__
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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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goto found;
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}
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#endif /* __FreeBSD__ */
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bad:
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DRM_OS_UNLOCK;
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return DRM_OS_ERR(EINVAL);
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found:
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#ifdef __linux__
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map = r_list->map;
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#endif /* __linux__ */
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#ifdef __FreeBSD__
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map = list->map;
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#endif /* __FreeBSD__ */
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if (!map) goto bad;
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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_OS_UNLOCK;
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return 0;
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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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char buf[64];
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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_OS_ERR(EBUSY);
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}
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#if __HAVE_DMA_HISTOGRAM
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dev->ctx_start = get_cycles();
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#endif
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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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if ( DRM(flags) & DRM_FLAG_NOCTX ) {
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DRM(context_switch_complete)( dev, new );
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} else {
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sprintf( buf, "C %d %d\n", old, new );
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DRM(write_string)( dev, buf );
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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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dev->last_switch = jiffies;
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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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#if __HAVE_DMA_HISTOGRAM
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atomic_inc( &dev->histo.ctx[DRM(histogram_slot)(get_cycles()
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- dev->ctx_start)] );
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#endif
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clear_bit( 0, &dev->context_flag );
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DRM_OS_WAKEUP( &dev->context_wait );
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return 0;
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}
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int DRM(resctx)( DRM_OS_IOCTL )
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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_OS_KRNFROMUSR( 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_OS_COPYTOUSR( &res.contexts[i],
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&i, sizeof(i) ) )
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return DRM_OS_ERR(EFAULT);
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}
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}
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res.count = DRM_RESERVED_CONTEXTS;
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DRM_OS_KRNTOUSR( (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_OS_IOCTL )
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{
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DRM_OS_DEVICE;
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drm_ctx_t ctx;
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DRM_OS_KRNFROMUSR( 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_OS_ERR(ENOMEM);
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}
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DRM_OS_KRNTOUSR( (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_OS_IOCTL )
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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_OS_IOCTL )
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{
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drm_ctx_t ctx;
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DRM_OS_KRNFROMUSR( 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_OS_KRNTOUSR( (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_OS_IOCTL )
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{
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DRM_OS_DEVICE;
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drm_ctx_t ctx;
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DRM_OS_KRNFROMUSR( 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_OS_IOCTL )
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{
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DRM_OS_DEVICE;
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drm_ctx_t ctx;
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DRM_OS_KRNFROMUSR( 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_OS_IOCTL )
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{
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DRM_OS_DEVICE;
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drm_ctx_t ctx;
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DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
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DRM_DEBUG( "%d\n", ctx.handle );
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#ifdef __linux__
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if ( ctx.handle == DRM_KERNEL_CONTEXT + 1 ) {
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priv->remove_auth_on_close = 1;
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}
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#endif /* __linux__ */
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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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#else /* __HAVE_CTX_BITMAP */
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/* ================================================================
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* Old-style context support
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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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char buf[64];
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drm_queue_t *q;
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#if 0
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atomic_inc(&dev->total_ctx);
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#endif
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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_OS_ERR(EBUSY);
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}
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#if __HAVE_DMA_HISTOGRAM
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dev->ctx_start = get_cycles();
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#endif
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DRM_DEBUG("Context switch from %d to %d\n", old, new);
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if (new >= dev->queue_count) {
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clear_bit(0, &dev->context_flag);
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return DRM_OS_ERR(EINVAL);
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}
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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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q = dev->queuelist[new];
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atomic_inc(&q->use_count);
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if (atomic_read(&q->use_count) == 1) {
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atomic_dec(&q->use_count);
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clear_bit(0, &dev->context_flag);
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return DRM_OS_ERR(EINVAL);
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}
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if (DRM(flags) & DRM_FLAG_NOCTX) {
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DRM(context_switch_complete)(dev, new);
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} else {
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sprintf(buf, "C %d %d\n", old, new);
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DRM(write_string)(dev, buf);
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}
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atomic_dec(&q->use_count);
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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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drm_device_dma_t *dma = dev->dma;
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dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
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dev->last_switch = jiffies;
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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 (!dma || !(dma->next_buffer && dma->next_buffer->while_locked)) {
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if (DRM(lock_free)(dev, &dev->lock.hw_lock->lock,
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DRM_KERNEL_CONTEXT)) {
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DRM_ERROR("Cannot free lock\n");
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}
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}
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#if __HAVE_DMA_HISTOGRAM
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atomic_inc(&dev->histo.ctx[DRM(histogram_slot)(get_cycles()
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- dev->ctx_start)]);
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#endif
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clear_bit(0, &dev->context_flag);
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DRM_OS_WAKEUP_INT(&dev->context_wait);
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return 0;
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}
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static int DRM(init_queue)(drm_device_t *dev, drm_queue_t *q, drm_ctx_t *ctx)
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{
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DRM_DEBUG("\n");
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if (atomic_read(&q->use_count) != 1
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|| atomic_read(&q->finalization)
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|| atomic_read(&q->block_count)) {
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DRM_ERROR("New queue is already in use: u%ld f%ld b%ld\n",
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(unsigned long)atomic_read(&q->use_count),
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(unsigned long)atomic_read(&q->finalization),
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(unsigned long)atomic_read(&q->block_count));
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}
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atomic_set(&q->finalization, 0);
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atomic_set(&q->block_count, 0);
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atomic_set(&q->block_read, 0);
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atomic_set(&q->block_write, 0);
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atomic_set(&q->total_queued, 0);
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atomic_set(&q->total_flushed, 0);
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atomic_set(&q->total_locks, 0);
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#ifdef __linux__
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init_waitqueue_head(&q->write_queue);
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init_waitqueue_head(&q->read_queue);
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init_waitqueue_head(&q->flush_queue);
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#endif /* __linux__ */
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#ifdef __FreeBSD__
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q->write_queue = 0;
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q->read_queue = 0;
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q->flush_queue = 0;
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#endif /* __FreeBSD__ */
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q->flags = ctx->flags;
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DRM(waitlist_create)(&q->waitlist, dev->dma->buf_count);
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return 0;
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}
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/* drm_alloc_queue:
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PRE: 1) dev->queuelist[0..dev->queue_count] is allocated and will not
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disappear (so all deallocation must be done after IOCTLs are off)
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2) dev->queue_count < dev->queue_slots
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3) dev->queuelist[i].use_count == 0 and
|
|
dev->queuelist[i].finalization == 0 if i not in use
|
|
POST: 1) dev->queuelist[i].use_count == 1
|
|
2) dev->queue_count < dev->queue_slots */
|
|
|
|
static int DRM(alloc_queue)(drm_device_t *dev)
|
|
{
|
|
int i;
|
|
drm_queue_t *queue;
|
|
int oldslots;
|
|
int newslots;
|
|
/* Check for a free queue */
|
|
for (i = 0; i < dev->queue_count; i++) {
|
|
atomic_inc(&dev->queuelist[i]->use_count);
|
|
if (atomic_read(&dev->queuelist[i]->use_count) == 1
|
|
&& !atomic_read(&dev->queuelist[i]->finalization)) {
|
|
DRM_DEBUG("%d (free)\n", i);
|
|
return i;
|
|
}
|
|
atomic_dec(&dev->queuelist[i]->use_count);
|
|
}
|
|
/* Allocate a new queue */
|
|
DRM_OS_LOCK;
|
|
|
|
queue = gamma_alloc(sizeof(*queue), DRM_MEM_QUEUES);
|
|
memset(queue, 0, sizeof(*queue));
|
|
atomic_set(&queue->use_count, 1);
|
|
|
|
++dev->queue_count;
|
|
if (dev->queue_count >= dev->queue_slots) {
|
|
oldslots = dev->queue_slots * sizeof(*dev->queuelist);
|
|
if (!dev->queue_slots) dev->queue_slots = 1;
|
|
dev->queue_slots *= 2;
|
|
newslots = dev->queue_slots * sizeof(*dev->queuelist);
|
|
|
|
dev->queuelist = DRM(realloc)(dev->queuelist,
|
|
oldslots,
|
|
newslots,
|
|
DRM_MEM_QUEUES);
|
|
if (!dev->queuelist) {
|
|
DRM_OS_UNLOCK;
|
|
DRM_DEBUG("out of memory\n");
|
|
return DRM_OS_ERR(ENOMEM);
|
|
}
|
|
}
|
|
dev->queuelist[dev->queue_count-1] = queue;
|
|
|
|
DRM_OS_UNLOCK;
|
|
DRM_DEBUG("%d (new)\n", dev->queue_count - 1);
|
|
return dev->queue_count - 1;
|
|
}
|
|
|
|
int DRM(resctx)( DRM_OS_IOCTL )
|
|
{
|
|
drm_ctx_res_t res;
|
|
drm_ctx_t ctx;
|
|
int i;
|
|
|
|
DRM_DEBUG("%d\n", DRM_RESERVED_CONTEXTS);
|
|
|
|
DRM_OS_KRNFROMUSR( res, (drm_ctx_res_t *)data, sizeof(res) );
|
|
|
|
if (res.count >= DRM_RESERVED_CONTEXTS) {
|
|
memset(&ctx, 0, sizeof(ctx));
|
|
for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
|
|
ctx.handle = i;
|
|
if (DRM_OS_COPYTOUSR(&res.contexts[i],
|
|
&i,
|
|
sizeof(i)))
|
|
return DRM_OS_ERR(EFAULT);
|
|
}
|
|
}
|
|
res.count = DRM_RESERVED_CONTEXTS;
|
|
|
|
DRM_OS_KRNTOUSR( (drm_ctx_res_t *)data, res, sizeof(res) );
|
|
|
|
return 0;
|
|
}
|
|
|
|
int DRM(addctx)( DRM_OS_IOCTL )
|
|
{
|
|
DRM_OS_DEVICE;
|
|
drm_ctx_t ctx;
|
|
|
|
DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
|
|
|
|
if ((ctx.handle = DRM(alloc_queue)(dev)) == DRM_KERNEL_CONTEXT) {
|
|
/* Init kernel's context and get a new one. */
|
|
DRM(init_queue)(dev, dev->queuelist[ctx.handle], &ctx);
|
|
ctx.handle = DRM(alloc_queue)(dev);
|
|
}
|
|
DRM(init_queue)(dev, dev->queuelist[ctx.handle], &ctx);
|
|
DRM_DEBUG("%d\n", ctx.handle);
|
|
|
|
DRM_OS_KRNTOUSR( (drm_ctx_t *)data, ctx, sizeof(ctx) );
|
|
|
|
return 0;
|
|
}
|
|
|
|
int DRM(modctx)( DRM_OS_IOCTL )
|
|
{
|
|
DRM_OS_DEVICE;
|
|
drm_ctx_t ctx;
|
|
drm_queue_t *q;
|
|
|
|
DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
|
|
|
|
DRM_DEBUG("%d\n", ctx.handle);
|
|
|
|
if (ctx.handle < 0 || ctx.handle >= dev->queue_count)
|
|
return DRM_OS_ERR(EINVAL);
|
|
q = dev->queuelist[ctx.handle];
|
|
|
|
atomic_inc(&q->use_count);
|
|
if (atomic_read(&q->use_count) == 1) {
|
|
/* No longer in use */
|
|
atomic_dec(&q->use_count);
|
|
return DRM_OS_ERR(EINVAL);
|
|
}
|
|
|
|
if (DRM_BUFCOUNT(&q->waitlist)) {
|
|
atomic_dec(&q->use_count);
|
|
return DRM_OS_ERR(EBUSY);
|
|
}
|
|
|
|
q->flags = ctx.flags;
|
|
|
|
atomic_dec(&q->use_count);
|
|
return 0;
|
|
}
|
|
|
|
int DRM(getctx)( DRM_OS_IOCTL )
|
|
{
|
|
DRM_OS_DEVICE;
|
|
drm_ctx_t ctx;
|
|
drm_queue_t *q;
|
|
|
|
DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
|
|
|
|
DRM_DEBUG("%d\n", ctx.handle);
|
|
|
|
if (ctx.handle >= dev->queue_count)
|
|
return DRM_OS_ERR(EINVAL);
|
|
q = dev->queuelist[ctx.handle];
|
|
|
|
atomic_inc(&q->use_count);
|
|
if (atomic_read(&q->use_count) == 1) {
|
|
/* No longer in use */
|
|
atomic_dec(&q->use_count);
|
|
return DRM_OS_ERR(EINVAL);
|
|
}
|
|
|
|
ctx.flags = q->flags;
|
|
atomic_dec(&q->use_count);
|
|
|
|
DRM_OS_KRNTOUSR( (drm_ctx_t *)data, ctx, sizeof(ctx) );
|
|
|
|
return 0;
|
|
}
|
|
|
|
int DRM(switchctx)( DRM_OS_IOCTL )
|
|
{
|
|
DRM_OS_DEVICE;
|
|
drm_ctx_t ctx;
|
|
|
|
DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
|
|
|
|
DRM_DEBUG("%d\n", ctx.handle);
|
|
return DRM(context_switch)(dev, dev->last_context, ctx.handle);
|
|
}
|
|
|
|
int DRM(newctx)( DRM_OS_IOCTL )
|
|
{
|
|
DRM_OS_DEVICE;
|
|
drm_ctx_t ctx;
|
|
|
|
DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
|
|
|
|
DRM_DEBUG("%d\n", ctx.handle);
|
|
DRM(context_switch_complete)(dev, ctx.handle);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int DRM(rmctx)( DRM_OS_IOCTL )
|
|
{
|
|
DRM_OS_DEVICE;
|
|
drm_ctx_t ctx;
|
|
drm_queue_t *q;
|
|
drm_buf_t *buf;
|
|
|
|
DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
|
|
|
|
DRM_DEBUG("%d\n", ctx.handle);
|
|
|
|
if (ctx.handle >= dev->queue_count) return DRM_OS_ERR(EINVAL);
|
|
q = dev->queuelist[ctx.handle];
|
|
|
|
atomic_inc(&q->use_count);
|
|
if (atomic_read(&q->use_count) == 1) {
|
|
/* No longer in use */
|
|
atomic_dec(&q->use_count);
|
|
return DRM_OS_ERR(EINVAL);
|
|
}
|
|
|
|
atomic_inc(&q->finalization); /* Mark queue in finalization state */
|
|
atomic_sub(2, &q->use_count); /* Mark queue as unused (pending
|
|
finalization) */
|
|
|
|
while (test_and_set_bit(0, &dev->interrupt_flag)) {
|
|
#ifdef __linux__
|
|
schedule();
|
|
if (signal_pending(current)) {
|
|
clear_bit(0, &dev->interrupt_flag);
|
|
return DRM_OS_ERR(EINTR);
|
|
}
|
|
#endif /* __linux__ */
|
|
#ifdef __FreeBSD__
|
|
static int never;
|
|
int retcode;
|
|
retcode = tsleep(&never, PZERO|PCATCH, "never", 1);
|
|
if (retcode)
|
|
return retcode;
|
|
#endif /* __FreeBSD__ */
|
|
}
|
|
/* Remove queued buffers */
|
|
while ((buf = DRM(waitlist_get)(&q->waitlist))) {
|
|
DRM(free_buffer)(dev, buf);
|
|
}
|
|
clear_bit(0, &dev->interrupt_flag);
|
|
|
|
/* Wakeup blocked processes */
|
|
#ifdef __linux__
|
|
wake_up_interruptible(&q->read_queue);
|
|
wake_up_interruptible(&q->write_queue);
|
|
#endif /* __linux__ */
|
|
#ifdef __FreeBSD__
|
|
wakeup( &q->block_read );
|
|
wakeup( &q->block_write );
|
|
#endif /* __FreeBSD__ */
|
|
DRM_OS_WAKEUP_INT( &q->flush_queue );
|
|
/* Finalization over. Queue is made
|
|
available when both use_count and
|
|
finalization become 0, which won't
|
|
happen until all the waiting processes
|
|
stop waiting. */
|
|
atomic_dec(&q->finalization);
|
|
return 0;
|
|
}
|
|
|
|
#endif /* __HAVE_CTX_BITMAP */
|