drm_bufs.c

linux-2.6.15.6

	int byte_count;
	int i;
	drm_buf_t **temp_buflist;

	if (!dma)
		return -EINVAL;

	count = request->count;
	order = drm_order(request->size);
	size = 1 << order;

	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;

	byte_count = 0;
	agp_offset = dev->agp->base + request->agp_start;

	DRM_DEBUG("count:      %d\n", count);
	DRM_DEBUG("order:      %d\n", order);
	DRM_DEBUG("size:       %d\n", size);
	DRM_DEBUG("agp_offset: %lu\n", agp_offset);
	DRM_DEBUG("alignment:  %d\n", alignment);
	DRM_DEBUG("page_order: %d\n", page_order);
	DRM_DEBUG("total:      %d\n", total);

	if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
		return -EINVAL;
	if (dev->queue_count)
		return -EBUSY;	/* Not while in use */

	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 */
	}

	if (count < 0 || count > 4096) {
		up(&dev->struct_sem);
		atomic_dec(&dev->buf_alloc);
		return -EINVAL;
	}

	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->buf_size = size;
	entry->page_order = page_order;

	offset = 0;

	while (entry->buf_count < 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 + offset);
		buf->bus_address = agp_offset + offset;
		buf->address = (void *)(agp_offset + offset);
		buf->next = NULL;
		buf->waiting = 0;
		buf->pending = 0;
		init_waitqueue_head(&buf->dma_wait);
		buf->filp = NULL;

		buf->dev_priv_size = dev->driver->dev_priv_size;
		buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
		if (!buf->dev_private) {
			/* Set count correctly so we free the proper amount. */
			entry->buf_count = count;
			drm_cleanup_buf_error(dev, entry);
			up(&dev->struct_sem);
			atomic_dec(&dev->buf_alloc);
			return -ENOMEM;
		}
		memset(buf->dev_private, 0, buf->dev_priv_size);

		DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);

		offset += alignment;
		entry->buf_count++;
		byte_count += PAGE_SIZE << page_order;
	}

	DRM_DEBUG("byte_count: %d\n", byte_count);

	temp_buflist = drm_realloc(dma->buflist,
				   dma->buf_count * sizeof(*dma->buflist),
				   (dma->buf_count + entry->buf_count)
				   * sizeof(*dma->buflist), DRM_MEM_BUFS);
	if (!temp_buflist) {
		/* Free the entry because it isn't valid */
		drm_cleanup_buf_error(dev, entry);
		up(&dev->struct_sem);
		atomic_dec(&dev->buf_alloc);
		return -ENOMEM;
	}
	dma->buflist = temp_buflist;

	for (i = 0; i < entry->buf_count; i++) {
		dma->buflist[i + dma->buf_count] = &entry->buflist[i];
	}

	dma->buf_count += entry->buf_count;
	dma->byte_count += byte_count;

	DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
	DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);

	up(&dev->struct_sem);

	request->count = entry->buf_count;
	request->size = size;

	dma->flags = _DRM_DMA_USE_AGP;

	atomic_dec(&dev->buf_alloc);
	return 0;
}

EXPORT_SYMBOL(drm_addbufs_agp);
#endif				/* __OS_HAS_AGP */

int drm_addbufs_pci(drm_device_t * dev, drm_buf_desc_t * request)
{
	drm_device_dma_t *dma = dev->dma;
	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;
	unsigned long *temp_pagelist;
	drm_buf_t **temp_buflist;

	if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
		return -EINVAL;
	if (!dma)
		return -EINVAL;

	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 */
	}

	if (count < 0 || count > 4096) {
		up(&dev->struct_sem);
		atomic_dec(&dev->buf_alloc);
		return -EINVAL;
	}

	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));

	/* Keep the original pagelist until we know all the allocations
	 * have succeeded
	 */
	temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
				  * sizeof(*dma->pagelist), DRM_MEM_PAGES);
	if (!temp_pagelist) {
		drm_free(entry->buflist,
			 count * sizeof(*entry->buflist), DRM_MEM_BUFS);
		drm_free(entry->seglist,
			 count * sizeof(*entry->seglist), DRM_MEM_SEGS);
		up(&dev->struct_sem);
		atomic_dec(&dev->buf_alloc);
		return -ENOMEM;
	}
	memcpy(temp_pagelist,
	       dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
	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) {
		page = drm_alloc_pages(page_order, DRM_MEM_DMA);
		if (!page) {
			/* Set count correctly so we free the proper amount. */
			entry->buf_count = count;
			entry->seg_count = count;
			drm_cleanup_buf_error(dev, entry);
			drm_free(temp_pagelist,
				 (dma->page_count + (count << page_order))
				 * sizeof(*dma->pagelist), DRM_MEM_PAGES);
			up(&dev->struct_sem);
			atomic_dec(&dev->buf_alloc);
			return -ENOMEM;
		}
		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);
			temp_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->filp = NULL;

			buf->dev_priv_size = dev->driver->dev_priv_size;
			buf->dev_private = drm_alloc(buf->dev_priv_size,
						     DRM_MEM_BUFS);
			if (!buf->dev_private) {
				/* Set count correctly so we free the proper amount. */
				entry->buf_count = count;
				entry->seg_count = count;
				drm_cleanup_buf_error(dev, entry);
				drm_free(temp_pagelist,
					 (dma->page_count +
					  (count << page_order))
					 * sizeof(*dma->pagelist),
					 DRM_MEM_PAGES);
				up(&dev->struct_sem);
				atomic_dec(&dev->buf_alloc);
				return -ENOMEM;
			}
			memset(buf->dev_private, 0, buf->dev_priv_size);

			DRM_DEBUG("buffer %d @ %p\n",
				  entry->buf_count, buf->address);
		}
		byte_count += PAGE_SIZE << page_order;
	}

	temp_buflist = drm_realloc(dma->buflist,
				   dma->buf_count * sizeof(*dma->buflist),
				   (dma->buf_count + entry->buf_count)
				   * sizeof(*dma->buflist), DRM_MEM_BUFS);
	if (!temp_buflist) {
		/* Free the entry because it isn't valid */
		drm_cleanup_buf_error(dev, entry);
		drm_free(temp_pagelist,
			 (dma->page_count + (count << page_order))
			 * sizeof(*dma->pagelist), DRM_MEM_PAGES);
		up(&dev->struct_sem);
		atomic_dec(&dev->buf_alloc);
		return -ENOMEM;
	}
	dma->buflist = temp_buflist;

	for (i = 0; i < entry->buf_count; i++) {
		dma->buflist[i + dma->buf_count] = &entry->buflist[i];
	}

	/* No allocations failed, so now we can replace the orginal pagelist
	 * with the new one.
	 */
	if (dma->page_count) {
		drm_free(dma->pagelist,
			 dma->page_count * sizeof(*dma->pagelist),
			 DRM_MEM_PAGES);
	}
	dma->pagelist = temp_pagelist;

	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);

	up(&dev->struct_sem);

	request->count = entry->buf_count;
	request->size = size;

	atomic_dec(&dev->buf_alloc);
	return 0;

}

EXPORT_SYMBOL(drm_addbufs_pci);

static int drm_addbufs_sg(drm_device_t * dev, drm_buf_desc_t * request)
{
	drm_device_dma_t *dma = dev->dma;
	drm_buf_entry_t *entry;
	drm_buf_t *buf;
	unsigned long offset;
	unsigned long agp_offset;
	int count;
	int order;
	int size;
	int alignment;
	int page_order;
	int total;
	int byte_count;
	int i;
	drm_buf_t **temp_buflist;

	if (!drm_core_check_feature(dev, DRIVER_SG))
		return -EINVAL;

	if (!dma)
		return -EINVAL;

	count = request->count;
	order = drm_order(request->size);
	size = 1 << order;

	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;

	byte_count = 0;
	agp_offset = request->agp_start;

	DRM_DEBUG("count:      %d\n", count);
	DRM_DEBUG("order:      %d\n", order);
	DRM_DEBUG("size:       %d\n", size);
	DRM_DEBUG("agp_offset: %lu\n", agp_offset);
	DRM_DEBUG("alignment:  %d\n", alignment);
	DRM_DEBUG("page_order: %d\n", page_order);
	DRM_DEBUG("total:      %d\n", total);

	if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
		return -EINVAL;
	if (dev->queue_count)
		return -EBUSY;	/* Not while in use */

	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 */
	}

	if (count < 0 || count > 4096) {
		up(&dev->struct_sem);
		atomic_dec(&dev->buf_alloc);
		return -EINVAL;
	}

	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->buf_size = size;
	entry->page_order = page_order;

	offset = 0;

	while (entry->buf_count < 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 + offset);
		buf->bus_address = agp_offset + offset;
		buf->address = (void *)(agp_offset + offset
					+ (unsigned long)dev->sg->virtual);
		buf->next = NULL;
		buf->waiting = 0;
		buf->pending = 0;
		init_waitqueue_head(&buf->dma_wait);
		buf->filp = NULL;

		buf->dev_priv_size = dev->driver->dev_priv_size;
		buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
		if (!buf->dev_private) {
			/* Set count correctly so we free the proper amount. */
			entry->buf_count = count;
			drm_cleanup_buf_error(dev, entry);
			up(&dev->struct_sem);
			atomic_dec(&dev->buf_alloc);
			return -ENOMEM;
		}

		memset(buf->dev_private, 0, buf->dev_priv_size);

		DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);

		offset += alignment;
		entry->buf_count++;
		byte_count += PAGE_SIZE << page_order;
	}

	DRM_DEBUG("byte_count: %d\n", byte_count);

	temp_buflist = drm_realloc(dma->buflist,
				   dma->buf_count * sizeof(*dma->buflist),
				   (dma->buf_count + entry->buf_count)
				   * sizeof(*dma->buflist), DRM_MEM_BUFS);
	if (!temp_buflist) {
		/* Free the entry because it isn't valid */
		drm_cleanup_buf_error(dev, entry);
		up(&dev->struct_sem);
		atomic_dec(&dev->buf_alloc);
		return -ENOMEM;
	}
	dma->buflist = temp_buflist;

	for (i = 0; i < entry->buf_count; i++) {
		dma->buflist[i + dma->buf_count] = &entry->buflist[i];
	}

	dma->buf_count += entry->buf_count;
	dma->byte_count += byte_count;

	DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
	DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);

	up(&dev->struct_sem);

	request->count = entry->buf_count;
	request->size = size;

	dma->flags = _DRM_DMA_USE_SG;

	atomic_dec(&dev->buf_alloc);
	return 0;
}

static int drm_addbufs_fb(drm_device_t * dev, drm_buf_desc_t * request)
{
	drm_device_dma_t *dma = dev->dma;
	drm_buf_entry_t *entry;
	drm_buf_t *buf;
	unsigned long offset;
	unsigned long agp_offset;
	int count;
	int order;
	int size;
	int alignment;
	int page_order;