path: root/drivers/gpu/drm/drm_bufs.c

/**
 * \file drm_bufs.c
 * Generic buffer template
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Gareth Hughes <gareth@valinux.com>
 */

/*
 * Created: Thu Nov 23 03:10:50 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.
 */

#include <linux/vmalloc.h>
#include "drmP.h"

unsigned long drm_get_resource_start(struct drm_device *dev, unsigned int resource)
{
	return pci_resource_start(dev->pdev, resource);
}
EXPORT_SYMBOL(drm_get_resource_start);

unsigned long drm_get_resource_len(struct drm_device *dev, unsigned int resource)
{
	return pci_resource_len(dev->pdev, resource);
}

EXPORT_SYMBOL(drm_get_resource_len);

static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
					     drm_local_map_t *map)
{
	struct drm_map_list *entry;
	list_for_each_entry(entry, &dev->maplist, head) {
		if (entry->map && (entry->master == dev->primary->master) && (map->type == entry->map->type) &&
		    ((entry->map->offset == map->offset) ||
		     ((map->type == _DRM_SHM) && (map->flags&_DRM_CONTAINS_LOCK)))) {
			return entry;
		}
	}

	return NULL;
}

static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
			  unsigned long user_token, int hashed_handle)
{
	int use_hashed_handle;
#if (BITS_PER_LONG == 64)
	use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
#elif (BITS_PER_LONG == 32)
	use_hashed_handle = hashed_handle;
#else
#error Unsupported long size. Neither 64 nor 32 bits.
#endif

	if (!use_hashed_handle) {
		int ret;
		hash->key = user_token >> PAGE_SHIFT;
		ret = drm_ht_insert_item(&dev->map_hash, hash);
		if (ret != -EINVAL)
			return ret;
	}
	return drm_ht_just_insert_please(&dev->map_hash, hash,
					 user_token, 32 - PAGE_SHIFT - 3,
					 0, DRM_MAP_HASH_OFFSET >> PAGE_SHIFT);
}

/**
 * Ioctl to specify a range of memory that is available for mapping by a non-root process.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg pointer to a drm_map structure.
 * \return zero on success or a negative value on error.
 *
 * Adjusts the memory offset to its absolute value according to the mapping
 * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
 * applicable and if supported by the kernel.
 */
static int drm_addmap_core(struct drm_device * dev, unsigned int offset,
			   unsigned int size, enum drm_map_type type,
			   enum drm_map_flags flags,
			   struct drm_map_list ** maplist)
{
	struct drm_map *map;
	struct drm_map_list *list;
	drm_dma_handle_t *dmah;
	unsigned long user_token;
	int ret;

	map = drm_alloc(sizeof(*map), DRM_MEM_MAPS);
	if (!map)
		return -ENOMEM;

	map->offset = offset;
	map->size = size;
	map->flags = flags;
	map->type = type;

	/* Only allow shared memory to be removable since we only keep enough
	 * book keeping inf