drm_context.h
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上传日期:2013-02-24
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- /* drm_context.h -- IOCTLs for generic contexts -*- linux-c -*-
- * Created: Fri Nov 24 18:31:37 2000 by gareth@valinux.com
- *
- * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
- * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
- * All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice (including the next
- * paragraph) shall be included in all copies or substantial portions of the
- * Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
- * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
- * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
- * OTHER DEALINGS IN THE SOFTWARE.
- *
- * Authors:
- * Rickard E. (Rik) Faith <faith@valinux.com>
- * Gareth Hughes <gareth@valinux.com>
- * ChangeLog:
- * 2001-11-16 Torsten Duwe <duwe@caldera.de>
- * added context constructor/destructor hooks,
- * needed by SiS driver's memory management.
- */
- #define __NO_VERSION__
- #include "drmP.h"
- #if __HAVE_CTX_BITMAP
- /* ================================================================
- * Context bitmap support
- */
- void DRM(ctxbitmap_free)( drm_device_t *dev, int ctx_handle )
- {
- if ( ctx_handle < 0 ) goto failed;
- if ( !dev->ctx_bitmap ) goto failed;
- if ( ctx_handle < DRM_MAX_CTXBITMAP ) {
- down(&dev->struct_sem);
- clear_bit( ctx_handle, dev->ctx_bitmap );
- dev->context_sareas[ctx_handle] = NULL;
- up(&dev->struct_sem);
- return;
- }
- failed:
- DRM_ERROR( "Attempt to free invalid context handle: %dn",
- ctx_handle );
- return;
- }
- int DRM(ctxbitmap_next)( drm_device_t *dev )
- {
- int bit;
- if(!dev->ctx_bitmap) return -1;
- down(&dev->struct_sem);
- bit = find_first_zero_bit( dev->ctx_bitmap, DRM_MAX_CTXBITMAP );
- if ( bit < DRM_MAX_CTXBITMAP ) {
- set_bit( bit, dev->ctx_bitmap );
- DRM_DEBUG( "drm_ctxbitmap_next bit : %dn", bit );
- if((bit+1) > dev->max_context) {
- dev->max_context = (bit+1);
- if(dev->context_sareas) {
- drm_map_t **ctx_sareas;
- ctx_sareas = DRM(realloc)(dev->context_sareas,
- (dev->max_context - 1) *
- sizeof(*dev->context_sareas),
- dev->max_context *
- sizeof(*dev->context_sareas),
- DRM_MEM_MAPS);
- if(!ctx_sareas) {
- clear_bit(bit, dev->ctx_bitmap);
- up(&dev->struct_sem);
- return -1;
- }
- dev->context_sareas = ctx_sareas;
- dev->context_sareas[bit] = NULL;
- } else {
- /* max_context == 1 at this point */
- dev->context_sareas = DRM(alloc)(
- dev->max_context *
- sizeof(*dev->context_sareas),
- DRM_MEM_MAPS);
- if(!dev->context_sareas) {
- clear_bit(bit, dev->ctx_bitmap);
- up(&dev->struct_sem);
- return -1;
- }
- dev->context_sareas[bit] = NULL;
- }
- }
- up(&dev->struct_sem);
- return bit;
- }
- up(&dev->struct_sem);
- return -1;
- }
- int DRM(ctxbitmap_init)( drm_device_t *dev )
- {
- int i;
- int temp;
- down(&dev->struct_sem);
- dev->ctx_bitmap = (unsigned long *) DRM(alloc)( PAGE_SIZE,
- DRM_MEM_CTXBITMAP );
- if ( dev->ctx_bitmap == NULL ) {
- up(&dev->struct_sem);
- return -ENOMEM;
- }
- memset( (void *)dev->ctx_bitmap, 0, PAGE_SIZE );
- dev->context_sareas = NULL;
- dev->max_context = -1;
- up(&dev->struct_sem);
- for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; i++ ) {
- temp = DRM(ctxbitmap_next)( dev );
- DRM_DEBUG( "drm_ctxbitmap_init : %dn", temp );
- }
- return 0;
- }
- void DRM(ctxbitmap_cleanup)( drm_device_t *dev )
- {
- down(&dev->struct_sem);
- if( dev->context_sareas ) DRM(free)( dev->context_sareas,
- sizeof(*dev->context_sareas) *
- dev->max_context,
- DRM_MEM_MAPS );
- DRM(free)( (void *)dev->ctx_bitmap, PAGE_SIZE, DRM_MEM_CTXBITMAP );
- up(&dev->struct_sem);
- }
- /* ================================================================
- * Per Context SAREA Support
- */
- int DRM(getsareactx)(struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg)
- {
- drm_file_t *priv = filp->private_data;
- drm_device_t *dev = priv->dev;
- drm_ctx_priv_map_t request;
- drm_map_t *map;
- if (copy_from_user(&request,
- (drm_ctx_priv_map_t *)arg,
- sizeof(request)))
- return -EFAULT;
- down(&dev->struct_sem);
- if (dev->max_context < 0 || request.ctx_id >= (unsigned) dev->max_context) {
- up(&dev->struct_sem);
- return -EINVAL;
- }
- map = dev->context_sareas[request.ctx_id];
- up(&dev->struct_sem);
- request.handle = map->handle;
- if (copy_to_user((drm_ctx_priv_map_t *)arg, &request, sizeof(request)))
- return -EFAULT;
- return 0;
- }
- int DRM(setsareactx)(struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg)
- {
- drm_file_t *priv = filp->private_data;
- drm_device_t *dev = priv->dev;
- drm_ctx_priv_map_t request;
- drm_map_t *map = NULL;
- drm_map_list_t *r_list = NULL;
- struct list_head *list;
- if (copy_from_user(&request,
- (drm_ctx_priv_map_t *)arg,
- sizeof(request)))
- return -EFAULT;
- down(&dev->struct_sem);
- list_for_each(list, &dev->maplist->head) {
- r_list = (drm_map_list_t *)list;
- if(r_list->map &&
- r_list->map->handle == request.handle)
- goto found;
- }
- bad:
- up(&dev->struct_sem);
- return -EINVAL;
- found:
- map = r_list->map;
- if (!map) goto bad;
- if (dev->max_context < 0)
- goto bad;
- if (request.ctx_id >= (unsigned) dev->max_context)
- goto bad;
- dev->context_sareas[request.ctx_id] = map;
- up(&dev->struct_sem);
- return 0;
- }
- /* ================================================================
- * The actual DRM context handling routines
- */
- int DRM(context_switch)( drm_device_t *dev, int old, int new )
- {
- char buf[64];
- if ( test_and_set_bit( 0, &dev->context_flag ) ) {
- DRM_ERROR( "Reentering -- FIXMEn" );
- return -EBUSY;
- }
- #if __HAVE_DMA_HISTOGRAM
- dev->ctx_start = get_cycles();
- #endif
- DRM_DEBUG( "Context switch from %d to %dn", old, new );
- if ( new == dev->last_context ) {
- clear_bit( 0, &dev->context_flag );
- return 0;
- }
- if ( DRM(flags) & DRM_FLAG_NOCTX ) {
- DRM(context_switch_complete)( dev, new );
- } else {
- sprintf( buf, "C %d %dn", old, new );
- DRM(write_string)( dev, buf );
- }
- return 0;
- }
- int DRM(context_switch_complete)( drm_device_t *dev, int new )
- {
- dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
- dev->last_switch = jiffies;
- if ( !_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) ) {
- DRM_ERROR( "Lock isn't held after context switchn" );
- }
- /* If a context switch is ever initiated
- when the kernel holds the lock, release
- that lock here. */
- #if __HAVE_DMA_HISTOGRAM
- atomic_inc( &dev->histo.ctx[DRM(histogram_slot)(get_cycles()
- - dev->ctx_start)] );
- #endif
- clear_bit( 0, &dev->context_flag );
- wake_up( &dev->context_wait );
- return 0;
- }
- int DRM(resctx)( struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg )
- {
- drm_ctx_res_t res;
- drm_ctx_t ctx;
- int i;
- if ( copy_from_user( &res, (drm_ctx_res_t *)arg, sizeof(res) ) )
- return -EFAULT;
- if ( res.count >= DRM_RESERVED_CONTEXTS ) {
- memset( &ctx, 0, sizeof(ctx) );
- for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; i++ ) {
- ctx.handle = i;
- if ( copy_to_user( &res.contexts[i],
- &i, sizeof(i) ) )
- return -EFAULT;
- }
- }
- res.count = DRM_RESERVED_CONTEXTS;
- if ( copy_to_user( (drm_ctx_res_t *)arg, &res, sizeof(res) ) )
- return -EFAULT;
- return 0;
- }
- int DRM(addctx)( struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg )
- {
- drm_file_t *priv = filp->private_data;
- drm_device_t *dev = priv->dev;
- drm_ctx_t ctx;
- if ( copy_from_user( &ctx, (drm_ctx_t *)arg, sizeof(ctx) ) )
- return -EFAULT;
- ctx.handle = DRM(ctxbitmap_next)( dev );
- if ( ctx.handle == DRM_KERNEL_CONTEXT ) {
- /* Skip kernel's context and get a new one. */
- ctx.handle = DRM(ctxbitmap_next)( dev );
- }
- DRM_DEBUG( "%dn", ctx.handle );
- if ( ctx.handle == -1 ) {
- DRM_DEBUG( "Not enough free contexts.n" );
- /* Should this return -EBUSY instead? */
- return -ENOMEM;
- }
- #ifdef DRIVER_CTX_CTOR
- if ( ctx.handle != DRM_KERNEL_CONTEXT )
- DRIVER_CTX_CTOR(ctx.handle); /* XXX: also pass dev ? */
- #endif
- if ( copy_to_user( (drm_ctx_t *)arg, &ctx, sizeof(ctx) ) )
- return -EFAULT;
- return 0;
- }
- int DRM(modctx)( struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg )
- {
- /* This does nothing */
- return 0;
- }
- int DRM(getctx)( struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg )
- {
- drm_ctx_t ctx;
- if ( copy_from_user( &ctx, (drm_ctx_t*)arg, sizeof(ctx) ) )
- return -EFAULT;
- /* This is 0, because we don't handle any context flags */
- ctx.flags = 0;
- if ( copy_to_user( (drm_ctx_t*)arg, &ctx, sizeof(ctx) ) )
- return -EFAULT;
- return 0;
- }
- int DRM(switchctx)( struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg )
- {
- drm_file_t *priv = filp->private_data;
- drm_device_t *dev = priv->dev;
- drm_ctx_t ctx;
- if ( copy_from_user( &ctx, (drm_ctx_t *)arg, sizeof(ctx) ) )
- return -EFAULT;
- DRM_DEBUG( "%dn", ctx.handle );
- return DRM(context_switch)( dev, dev->last_context, ctx.handle );
- }
- int DRM(newctx)( struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg )
- {
- drm_file_t *priv = filp->private_data;
- drm_device_t *dev = priv->dev;
- drm_ctx_t ctx;
- if ( copy_from_user( &ctx, (drm_ctx_t *)arg, sizeof(ctx) ) )
- return -EFAULT;
- DRM_DEBUG( "%dn", ctx.handle );
- DRM(context_switch_complete)( dev, ctx.handle );
- return 0;
- }
- int DRM(rmctx)( struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg )
- {
- drm_file_t *priv = filp->private_data;
- drm_device_t *dev = priv->dev;
- drm_ctx_t ctx;
- if ( copy_from_user( &ctx, (drm_ctx_t *)arg, sizeof(ctx) ) )
- return -EFAULT;
- DRM_DEBUG( "%dn", ctx.handle );
- if ( ctx.handle == DRM_KERNEL_CONTEXT + 1 ) {
- priv->remove_auth_on_close = 1;
- }
- if ( ctx.handle != DRM_KERNEL_CONTEXT ) {
- #ifdef DRIVER_CTX_DTOR
- DRIVER_CTX_DTOR(ctx.handle); /* XXX: also pass dev ? */
- #endif
- DRM(ctxbitmap_free)( dev, ctx.handle );
- }
- return 0;
- }
- #else /* __HAVE_CTX_BITMAP */
- /* ================================================================
- * Old-style context support
- */
- int DRM(context_switch)(drm_device_t *dev, int old, int new)
- {
- char buf[64];
- drm_queue_t *q;
- #if 0
- atomic_inc(&dev->total_ctx);
- #endif
- if (test_and_set_bit(0, &dev->context_flag)) {
- DRM_ERROR("Reentering -- FIXMEn");
- return -EBUSY;
- }
- #if __HAVE_DMA_HISTOGRAM
- dev->ctx_start = get_cycles();
- #endif
- DRM_DEBUG("Context switch from %d to %dn", old, new);
- if (new >= dev->queue_count) {
- clear_bit(0, &dev->context_flag);
- return -EINVAL;
- }
- if (new == dev->last_context) {
- clear_bit(0, &dev->context_flag);
- return 0;
- }
- q = dev->queuelist[new];
- atomic_inc(&q->use_count);
- if (atomic_read(&q->use_count) == 1) {
- atomic_dec(&q->use_count);
- clear_bit(0, &dev->context_flag);
- return -EINVAL;
- }
- if (DRM(flags) & DRM_FLAG_NOCTX) {
- DRM(context_switch_complete)(dev, new);
- } else {
- sprintf(buf, "C %d %dn", old, new);
- DRM(write_string)(dev, buf);
- }
- atomic_dec(&q->use_count);
- return 0;
- }
- int DRM(context_switch_complete)(drm_device_t *dev, int new)
- {
- drm_device_dma_t *dma = dev->dma;
- dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
- dev->last_switch = jiffies;
- if (!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
- DRM_ERROR("Lock isn't held after context switchn");
- }
- if (!dma || !(dma->next_buffer && dma->next_buffer->while_locked)) {
- if (DRM(lock_free)(dev, &dev->lock.hw_lock->lock,
- DRM_KERNEL_CONTEXT)) {
- DRM_ERROR("Cannot free lockn");
- }
- }
- #if __HAVE_DMA_HISTOGRAM
- atomic_inc(&dev->histo.ctx[DRM(histogram_slot)(get_cycles()
- - dev->ctx_start)]);
- #endif
- clear_bit(0, &dev->context_flag);
- wake_up_interruptible(&dev->context_wait);
- return 0;
- }
- static int DRM(init_queue)(drm_device_t *dev, drm_queue_t *q, drm_ctx_t *ctx)
- {
- DRM_DEBUG("n");
- if (atomic_read(&q->use_count) != 1
- || atomic_read(&q->finalization)
- || atomic_read(&q->block_count)) {
- DRM_ERROR("New queue is already in use: u%d f%d b%dn",
- atomic_read(&q->use_count),
- atomic_read(&q->finalization),
- atomic_read(&q->block_count));
- }
- atomic_set(&q->finalization, 0);
- atomic_set(&q->block_count, 0);
- atomic_set(&q->block_read, 0);
- atomic_set(&q->block_write, 0);
- atomic_set(&q->total_queued, 0);
- atomic_set(&q->total_flushed, 0);
- atomic_set(&q->total_locks, 0);
- init_waitqueue_head(&q->write_queue);
- init_waitqueue_head(&q->read_queue);
- init_waitqueue_head(&q->flush_queue);
- q->flags = ctx->flags;
- DRM(waitlist_create)(&q->waitlist, dev->dma->buf_count);
- return 0;
- }
- /* drm_alloc_queue:
- PRE: 1) dev->queuelist[0..dev->queue_count] is allocated and will not
- disappear (so all deallocation must be done after IOCTLs are off)
- 2) dev->queue_count < dev->queue_slots
- 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 */
- down(&dev->struct_sem);
- 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) {
- up(&dev->struct_sem);
- DRM_DEBUG("out of memoryn");
- return -ENOMEM;
- }
- }
- dev->queuelist[dev->queue_count-1] = queue;
- up(&dev->struct_sem);
- DRM_DEBUG("%d (new)n", dev->queue_count - 1);
- return dev->queue_count - 1;
- }
- int DRM(resctx)(struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg)
- {
- drm_ctx_res_t res;
- drm_ctx_t ctx;
- int i;
- DRM_DEBUG("%dn", DRM_RESERVED_CONTEXTS);
- if (copy_from_user(&res, (drm_ctx_res_t *)arg, sizeof(res)))
- return -EFAULT;
- if (res.count >= DRM_RESERVED_CONTEXTS) {
- memset(&ctx, 0, sizeof(ctx));
- for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
- ctx.handle = i;
- if (copy_to_user(&res.contexts[i],
- &i,
- sizeof(i)))
- return -EFAULT;
- }
- }
- res.count = DRM_RESERVED_CONTEXTS;
- if (copy_to_user((drm_ctx_res_t *)arg, &res, sizeof(res)))
- return -EFAULT;
- return 0;
- }
- int DRM(addctx)(struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg)
- {
- drm_file_t *priv = filp->private_data;
- drm_device_t *dev = priv->dev;
- drm_ctx_t ctx;
- if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
- return -EFAULT;
- 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("%dn", ctx.handle);
- if (copy_to_user((drm_ctx_t *)arg, &ctx, sizeof(ctx)))
- return -EFAULT;
- return 0;
- }
- int DRM(modctx)(struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg)
- {
- drm_file_t *priv = filp->private_data;
- drm_device_t *dev = priv->dev;
- drm_ctx_t ctx;
- drm_queue_t *q;
- if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
- return -EFAULT;
- DRM_DEBUG("%dn", ctx.handle);
- if (ctx.handle < 0 || ctx.handle >= dev->queue_count) return -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 -EINVAL;
- }
- if (DRM_BUFCOUNT(&q->waitlist)) {
- atomic_dec(&q->use_count);
- return -EBUSY;
- }
- q->flags = ctx.flags;
- atomic_dec(&q->use_count);
- return 0;
- }
- int DRM(getctx)(struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg)
- {
- drm_file_t *priv = filp->private_data;
- drm_device_t *dev = priv->dev;
- drm_ctx_t ctx;
- drm_queue_t *q;
- if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
- return -EFAULT;
- DRM_DEBUG("%dn", ctx.handle);
- if (ctx.handle >= dev->queue_count) return -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 -EINVAL;
- }
- ctx.flags = q->flags;
- atomic_dec(&q->use_count);
- if (copy_to_user((drm_ctx_t *)arg, &ctx, sizeof(ctx)))
- return -EFAULT;
- return 0;
- }
- int DRM(switchctx)(struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg)
- {
- drm_file_t *priv = filp->private_data;
- drm_device_t *dev = priv->dev;
- drm_ctx_t ctx;
- if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
- return -EFAULT;
- DRM_DEBUG("%dn", ctx.handle);
- return DRM(context_switch)(dev, dev->last_context, ctx.handle);
- }
- int DRM(newctx)(struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg)
- {
- drm_file_t *priv = filp->private_data;
- drm_device_t *dev = priv->dev;
- drm_ctx_t ctx;
- if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
- return -EFAULT;
- DRM_DEBUG("%dn", ctx.handle);
- DRM(context_switch_complete)(dev, ctx.handle);
- return 0;
- }
- int DRM(rmctx)(struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg)
- {
- drm_file_t *priv = filp->private_data;
- drm_device_t *dev = priv->dev;
- drm_ctx_t ctx;
- drm_queue_t *q;
- drm_buf_t *buf;
- if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
- return -EFAULT;
- DRM_DEBUG("%dn", ctx.handle);
- if (ctx.handle >= dev->queue_count) return -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 -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)) {
- schedule();
- if (signal_pending(current)) {
- clear_bit(0, &dev->interrupt_flag);
- return -EINTR;
- }
- }
- /* Remove queued buffers */
- while ((buf = DRM(waitlist_get)(&q->waitlist))) {
- DRM(free_buffer)(dev, buf);
- }
- clear_bit(0, &dev->interrupt_flag);
- /* Wakeup blocked processes */
- wake_up_interruptible(&q->read_queue);
- wake_up_interruptible(&q->write_queue);
- wake_up_interruptible(&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 */