fffd429f13
locking, and the apparently unnecessary locking for -stable has been removed. This may fix issues with missed interrupts since April, which manifested themselves as slowdowns or hangs in radeon, in particular. Many cleanups also took place. In the shared code, there are improvements to r128 driver stability.
353 lines
8.5 KiB
C
353 lines
8.5 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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#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 || ctx_handle >= DRM_MAX_CTXBITMAP ||
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dev->ctx_bitmap == NULL) {
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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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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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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 == NULL)
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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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DRM_UNLOCK();
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return -1;
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}
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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 != NULL) {
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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 == NULL) {
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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)(dev->max_context *
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sizeof(*dev->context_sareas), DRM_MEM_MAPS);
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if (dev->context_sareas == NULL) {
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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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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(calloc)(1, 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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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 != NULL)
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DRM(free)(dev->context_sareas, sizeof(*dev->context_sareas) *
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dev->max_context, 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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bzero(&ctx, 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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#ifdef DRIVER_CTX_CTOR
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if ( ctx.handle != DRM_KERNEL_CONTEXT )
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DRIVER_CTX_CTOR(ctx.handle); /* XXX: also pass dev ? */
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#endif
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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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#ifdef DRIVER_CTX_DTOR
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DRIVER_CTX_DTOR(ctx.handle); /* XXX: also pass dev ? */
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#endif
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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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