patch-2.2.18 linux/drivers/char/drm/bufs.c

• Lines: 539
• Date: Tue Nov 28 20:14:54 2000
• Orig file: v2.2.17/drivers/char/drm/bufs.c
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/drivers/char/drm/bufs.c linux/drivers/char/drm/bufs.c
@@ -0,0 +1,538 @@
+/* bufs.c -- IOCTLs to manage buffers -*- linux-c -*-
+ * Created: Tue Feb  2 08:37:54 1999 by faith@precisioninsight.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
+ * PRECISION INSIGHT 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>
+ *
+ */
+
+#define __NO_VERSION__
+#include <linux/config.h>
+#include "drmP.h"
+#include "linux/un.h"
+
+				/* Compute order.  Can be made faster. */
+int drm_order(unsigned long size)
+{
+	int	      order;
+	unsigned long tmp;
+
+	for (order = 0, tmp = size; tmp >>= 1; ++order);
+	if (size & ~(1 << order)) ++order;
+	return order;
+}
+
+int drm_addmap(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_map_t	*map;
+	
+	if (!(filp->f_mode & 3)) return -EACCES; /* Require read/write */
+
+	map	     = drm_alloc(sizeof(*map), DRM_MEM_MAPS);
+	if (!map) return -ENOMEM;
+	if (copy_from_user(map, (drm_map_t *)arg, sizeof(*map))) {
+		drm_free(map, sizeof(*map), DRM_MEM_MAPS);
+		return -EFAULT;
+	}
+
+	DRM_DEBUG("offset = 0x%08lx, size = 0x%08lx, type = %d\n",
+		  map->offset, map->size, map->type);
+	if ((map->offset & (~PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
+		drm_free(map, sizeof(*map), DRM_MEM_MAPS);
+		return -EINVAL;
+	}
+	map->mtrr   = -1;
+	map->handle = 0;
+
+	switch (map->type) {
+	case _DRM_REGISTERS:
+	case _DRM_FRAME_BUFFER:
+#if !defined(__sparc__) && !defined(__alpha__)
+		if (map->offset + map->size < map->offset
+		    || map->offset < virt_to_phys(high_memory)) {
+			drm_free(map, sizeof(*map), DRM_MEM_MAPS);
+			return -EINVAL;
+		}
+#endif
+#ifdef CONFIG_MTRR
+		if (map->type == _DRM_FRAME_BUFFER
+		    || (map->flags & _DRM_WRITE_COMBINING)) {
+			map->mtrr = mtrr_add(map->offset, map->size,
+					     MTRR_TYPE_WRCOMB, 1);
+		}
+#endif
+		map->handle = drm_ioremap(map->offset, map->size);
+		break;
+			
+
+	case _DRM_SHM:
+		map->handle = (void *)drm_alloc_pages(drm_order(map->size)
+						      - PAGE_SHIFT,
+						      DRM_MEM_SAREA);
+		DRM_DEBUG("%ld %d %p\n", map->size, drm_order(map->size),
+			  map->handle);
+		if (!map->handle) {
+			drm_free(map, sizeof(*map), DRM_MEM_MAPS);
+			return -ENOMEM;
+		}
+		map->offset = (unsigned long)map->handle;
+		if (map->flags & _DRM_CONTAINS_LOCK) {
+			dev->lock.hw_lock = map->handle; /* Pointer to lock */
+		}
+		break;
+#if defined(CONFIG_AGP) || defined(CONFIG_AGP_MODULE)
+	case _DRM_AGP:
+		map->offset = map->offset + dev->agp->base;
+		break;
+#endif
+	default:
+		drm_free(map, sizeof(*map), DRM_MEM_MAPS);
+		return -EINVAL;
+	}
+
+	down(&dev->struct_sem);
+	if (dev->maplist) {
+		++dev->map_count;
+		dev->maplist = drm_realloc(dev->maplist,
+					   (dev->map_count-1)
+					   * sizeof(*dev->maplist),
+					   dev->map_count
+					   * sizeof(*dev->maplist),
+					   DRM_MEM_MAPS);
+	} else {
+		dev->map_count = 1;
+		dev->maplist = drm_alloc(dev->map_count*sizeof(*dev->maplist),
+					 DRM_MEM_MAPS);
+	}
+	dev->maplist[dev->map_count-1] = map;
+	up(&dev->struct_sem);
+
+	copy_to_user_ret((drm_map_t *)arg, map, sizeof(*map), -EFAULT);
+	if (map->type != _DRM_SHM) {
+		copy_to_user_ret(&((drm_map_t *)arg)->handle,
+				 &map->offset,
+				 sizeof(map->offset),
+				 -EFAULT);
+	}		
+	return 0;
+}
+
+int drm_addbufs(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_device_dma_t *dma	 = dev->dma;
+	drm_buf_desc_t	 request;
+	int		 count;
+	int		 order;
+	int		 size;
+	int		 total;
+	int		 page_order;
+	drm_buf_entry_t	 *entry;
+	unsigned long	 page;
+	drm_buf_t	 *buf;
+	int		 alignment;
+	unsigned long	 offset;
+	int		 i;
+	int		 byte_count;
+	int		 page_count;
+
+	if (!dma) return -EINVAL;
+
+	copy_from_user_ret(&request,
+			   (drm_buf_desc_t *)arg,
+			   sizeof(request),
+			   -EFAULT);
+
+	count	   = request.count;
+	order	   = drm_order(request.size);
+	size	   = 1 << order;
+	
+	DRM_DEBUG("count = %d, size = %d (%d), order = %d, queue_count = %d\n",
+		  request.count, request.size, size, order, dev->queue_count);
+
+	if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) return -EINVAL;
+	if (dev->queue_count) return -EBUSY; /* Not while in use */
+
+	alignment  = (request.flags & _DRM_PAGE_ALIGN) ? PAGE_ALIGN(size):size;
+	page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
+	total	   = PAGE_SIZE << page_order;
+
+	spin_lock(&dev->count_lock);
+	if (dev->buf_use) {
+		spin_unlock(&dev->count_lock);
+		return -EBUSY;
+	}
+	atomic_inc(&dev->buf_alloc);
+	spin_unlock(&dev->count_lock);
+	
+	down(&dev->struct_sem);
+	entry = &dma->bufs[order];
+	if (entry->buf_count) {
+		up(&dev->struct_sem);
+		atomic_dec(&dev->buf_alloc);
+		return -ENOMEM;	/* May only call once for each order */
+	}
+	
+	entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
+				   DRM_MEM_BUFS);
+	if (!entry->buflist) {
+		up(&dev->struct_sem);
+		atomic_dec(&dev->buf_alloc);
+		return -ENOMEM;
+	}
+	memset(entry->buflist, 0, count * sizeof(*entry->buflist));
+
+	entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
+				   DRM_MEM_SEGS);
+	if (!entry->seglist) {
+		drm_free(entry->buflist,
+			 count * sizeof(*entry->buflist),
+			 DRM_MEM_BUFS);
+		up(&dev->struct_sem);
+		atomic_dec(&dev->buf_alloc);
+		return -ENOMEM;
+	}
+	memset(entry->seglist, 0, count * sizeof(*entry->seglist));
+
+	dma->pagelist = drm_realloc(dma->pagelist,
+				    dma->page_count * sizeof(*dma->pagelist),
+				    (dma->page_count + (count << page_order))
+				    * sizeof(*dma->pagelist),
+				    DRM_MEM_PAGES);
+	DRM_DEBUG("pagelist: %d entries\n",
+		  dma->page_count + (count << page_order));
+
+
+	entry->buf_size	  = size;
+	entry->page_order = page_order;
+	byte_count	  = 0;
+	page_count	  = 0;
+	while (entry->buf_count < count) {
+		if (!(page = drm_alloc_pages(page_order, DRM_MEM_DMA))) break;
+		entry->seglist[entry->seg_count++] = page;
+		for (i = 0; i < (1 << page_order); i++) {
+			DRM_DEBUG("page %d @ 0x%08lx\n",
+				  dma->page_count + page_count,
+				  page + PAGE_SIZE * i);
+			dma->pagelist[dma->page_count + page_count++]
+				= page + PAGE_SIZE * i;
+		}
+		for (offset = 0;
+		     offset + size <= total && entry->buf_count < count;
+		     offset += alignment, ++entry->buf_count) {
+			buf	     = &entry->buflist[entry->buf_count];
+			buf->idx     = dma->buf_count + entry->buf_count;
+			buf->total   = alignment;
+			buf->order   = order;
+			buf->used    = 0;
+			buf->offset  = (dma->byte_count + byte_count + offset);
+			buf->address = (void *)(page + offset);
+			buf->next    = NULL;
+			buf->waiting = 0;
+			buf->pending = 0;
+			init_waitqueue_head(&buf->dma_wait);
+			buf->pid     = 0;
+#if DRM_DMA_HISTOGRAM
+			buf->time_queued     = 0;
+			buf->time_dispatched = 0;
+			buf->time_completed  = 0;
+			buf->time_freed	     = 0;
+#endif
+			DRM_DEBUG("buffer %d @ %p\n",
+				  entry->buf_count, buf->address);
+		}
+		byte_count += PAGE_SIZE << page_order;
+	}
+
+	dma->buflist = drm_realloc(dma->buflist,
+				   dma->buf_count * sizeof(*dma->buflist),
+				   (dma->buf_count + entry->buf_count)
+				   * sizeof(*dma->buflist),
+				   DRM_MEM_BUFS);
+	for (i = dma->buf_count; i < dma->buf_count + entry->buf_count; i++)
+		dma->buflist[i] = &entry->buflist[i - dma->buf_count];
+
+	dma->buf_count	+= entry->buf_count;
+	dma->seg_count	+= entry->seg_count;
+	dma->page_count += entry->seg_count << page_order;
+	dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
+	
+	drm_freelist_create(&entry->freelist, entry->buf_count);
+	for (i = 0; i < entry->buf_count; i++) {
+		drm_freelist_put(dev, &entry->freelist, &entry->buflist[i]);
+	}
+	
+	up(&dev->struct_sem);
+
+	request.count = entry->buf_count;
+	request.size  = size;
+
+	copy_to_user_ret((drm_buf_desc_t *)arg,
+			 &request,
+			 sizeof(request),
+			 -EFAULT);
+	
+	atomic_dec(&dev->buf_alloc);
+	return 0;
+}
+
+int drm_infobufs(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_device_dma_t *dma	 = dev->dma;
+	drm_buf_info_t	 request;
+	int		 i;
+	int		 count;
+
+	if (!dma) return -EINVAL;
+
+	spin_lock(&dev->count_lock);
+	if (atomic_read(&dev->buf_alloc)) {
+		spin_unlock(&dev->count_lock);
+		return -EBUSY;
+	}
+	++dev->buf_use;		/* Can't allocate more after this call */
+	spin_unlock(&dev->count_lock);
+
+	copy_from_user_ret(&request,
+			   (drm_buf_info_t *)arg,
+			   sizeof(request),
+			   -EFAULT);
+
+	for (i = 0, count = 0; i < DRM_MAX_ORDER+1; i++) {
+		if (dma->bufs[i].buf_count) ++count;
+	}
+	
+	DRM_DEBUG("count = %d\n", count);
+	
+	if (request.count >= count) {
+		for (i = 0, count = 0; i < DRM_MAX_ORDER+1; i++) {
+			if (dma->bufs[i].buf_count) {
+				copy_to_user_ret(&request.list[count].count,
+						 &dma->bufs[i].buf_count,
+						 sizeof(dma->bufs[0]
+							.buf_count),
+						 -EFAULT);
+				copy_to_user_ret(&request.list[count].size,
+						 &dma->bufs[i].buf_size,
+						 sizeof(dma->bufs[0].buf_size),
+						 -EFAULT);
+				copy_to_user_ret(&request.list[count].low_mark,
+						 &dma->bufs[i]
+						 .freelist.low_mark,
+						 sizeof(dma->bufs[0]
+							.freelist.low_mark),
+						 -EFAULT);
+				copy_to_user_ret(&request.list[count]
+						 .high_mark,
+						 &dma->bufs[i]
+						 .freelist.high_mark,
+						 sizeof(dma->bufs[0]
+							.freelist.high_mark),
+						 -EFAULT);
+				DRM_DEBUG("%d %d %d %d %d\n",
+					  i,
+					  dma->bufs[i].buf_count,
+					  dma->bufs[i].buf_size,
+					  dma->bufs[i].freelist.low_mark,
+					  dma->bufs[i].freelist.high_mark);
+				++count;
+			}
+		}
+	}
+	request.count = count;
+
+	copy_to_user_ret((drm_buf_info_t *)arg,
+			 &request,
+			 sizeof(request),
+			 -EFAULT);
+	
+	return 0;
+}
+
+int drm_markbufs(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_device_dma_t *dma	 = dev->dma;
+	drm_buf_desc_t	 request;
+	int		 order;
+	drm_buf_entry_t	 *entry;
+
+	if (!dma) return -EINVAL;
+
+	copy_from_user_ret(&request,
+			   (drm_buf_desc_t *)arg,
+			   sizeof(request),
+			   -EFAULT);
+
+	DRM_DEBUG("%d, %d, %d\n",
+		  request.size, request.low_mark, request.high_mark);
+	order = drm_order(request.size);
+	if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) return -EINVAL;
+	entry = &dma->bufs[order];
+
+	if (request.low_mark < 0 || request.low_mark > entry->buf_count)
+		return -EINVAL;
+	if (request.high_mark < 0 || request.high_mark > entry->buf_count)
+		return -EINVAL;
+
+	entry->freelist.low_mark  = request.low_mark;
+	entry->freelist.high_mark = request.high_mark;
+	
+	return 0;
+}
+
+int drm_freebufs(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_device_dma_t *dma	 = dev->dma;
+	drm_buf_free_t	 request;
+	int		 i;
+	int		 idx;
+	drm_buf_t	 *buf;
+
+	if (!dma) return -EINVAL;
+
+	copy_from_user_ret(&request,
+			   (drm_buf_free_t *)arg,
+			   sizeof(request),
+			   -EFAULT);
+
+	DRM_DEBUG("%d\n", request.count);
+	for (i = 0; i < request.count; i++) {
+		copy_from_user_ret(&idx,
+				   &request.list[i],
+				   sizeof(idx),
+				   -EFAULT);
+		if (idx < 0 || idx >= dma->buf_count) {
+			DRM_ERROR("Index %d (of %d max)\n",
+				  idx, dma->buf_count - 1);
+			return -EINVAL;
+		}
+		buf = dma->buflist[idx];
+		if (buf->pid != current->pid) {
+			DRM_ERROR("Process %d freeing buffer owned by %d\n",
+				  current->pid, buf->pid);
+			return -EINVAL;
+		}
+		drm_free_buffer(dev, buf);
+	}
+	
+	return 0;
+}
+
+int drm_mapbufs(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_device_dma_t *dma	 = dev->dma;
+	int		 retcode = 0;
+	const int	 zero	 = 0;
+	unsigned long	 virtual;
+	unsigned long	 address;
+	drm_buf_map_t	 request;
+	int		 i;
+
+	if (!dma) return -EINVAL;
+	
+	DRM_DEBUG("\n");
+
+	spin_lock(&dev->count_lock);
+	if (atomic_read(&dev->buf_alloc)) {
+		spin_unlock(&dev->count_lock);
+		return -EBUSY;
+	}
+	++dev->buf_use;		/* Can't allocate more after this call */
+	spin_unlock(&dev->count_lock);
+
+	copy_from_user_ret(&request,
+			   (drm_buf_map_t *)arg,
+			   sizeof(request),
+			   -EFAULT);
+
+	if (request.count >= dma->buf_count) {
+		down(&current->mm->mmap_sem);
+		virtual = do_mmap(filp, 0, dma->byte_count,
+				  PROT_READ|PROT_WRITE, MAP_SHARED, 0);
+		up(&current->mm->mmap_sem);
+		if (virtual > -1024UL) {
+				/* Real error */
+			retcode = (signed long)virtual;
+			goto done;
+		}
+		request.virtual = (void *)virtual;
+
+		for (i = 0; i < dma->buf_count; i++) {
+			if (copy_to_user(&request.list[i].idx,
+					 &dma->buflist[i]->idx,
+					 sizeof(request.list[0].idx))) {
+				retcode = -EFAULT;
+				goto done;
+			}
+			if (copy_to_user(&request.list[i].total,
+					 &dma->buflist[i]->total,
+					 sizeof(request.list[0].total))) {
+				retcode = -EFAULT;
+				goto done;
+			}
+			if (copy_to_user(&request.list[i].used,
+					 &zero,
+					 sizeof(zero))) {
+				retcode = -EFAULT;
+				goto done;
+			}
+			address = virtual + dma->buflist[i]->offset;
+			if (copy_to_user(&request.list[i].address,
+					 &address,
+					 sizeof(address))) {
+				retcode = -EFAULT;
+				goto done;
+			}
+		}
+	}
+done:
+	request.count = dma->buf_count;
+	DRM_DEBUG("%d buffers, retcode = %d\n", request.count, retcode);
+
+	copy_to_user_ret((drm_buf_map_t *)arg,
+			 &request,
+			 sizeof(request),
+			 -EFAULT);
+
+	return retcode;
+}