linux-core/drm_bufs.c


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/**
 * \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(drm_device_t *dev, unsigned int resource)
{
	return pci_resource_start(dev->pdev, resource);
}
EXPORT_SYMBOL(drm_get_resource_start);

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

static drm_local_map_t *drm_find_matching_map(drm_device_t *dev,
					      drm_local_map_t *map)
{
	struct list_head *list;

	list_for_each(list, &dev->maplist->head) {
		drm_map_list_t *entry = list_entry(list, drm_map_list_t, head);
		if (entry->map && map->type == entry->map->type &&
		    entry->map->offset == map->offset) {
			return entry->map;
		}
	}

	return NULL;
}

#ifdef CONFIG_COMPAT
/*
 * Used to allocate 32-bit handles for _DRM_SHM regions
 * The 0x10000000 value is chosen to be out of the way of
 * FB/register and GART physical addresses.
 */
static unsigned int map32_handle = 0x10000000;
#endif

/**
 * Ioctl to specify a range of memory that is available for mapping by a non-root process.
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \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.
 */
int drm_addmap(drm_device_t * dev, unsigned int offset,
	       unsigned int size, drm_map_type_t type,
	       drm_map_flags_t flags, drm_local_map_t ** map_ptr)
{
	drm_map_t *map;
	drm_map_list_t *list;
	drm_dma_handle_t *dmah;
	drm_local_map_t *found_map;

	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 information about shared memory to allow for removal
	 * when processes fork.
	 */
	if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
		drm_free(map, sizeof(*map), DRM_MEM_MAPS);
		return -EINVAL;
	}
	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 = NULL;

	switch (map->type) {
	case _DRM_REGISTERS:
	case _DRM_FRAME_BUFFER:
#if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__)
		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 __alpha__
		map->offset += dev->hose->mem_space->start;
#endif
		/* Some drivers preinitialize some maps, without the X Server
		 * needing to be aware of it.  Therefore, we just return success
		 * when the server tries to create a duplicate map.
		 */
		found_map = drm_find_matching_map(dev, map);
		if (found_map != NULL) {
			if (found_map->size != map->size) {
				DRM_DEBUG("Matching maps of type %d with "
				   "mismatched sizes, (%ld vs %ld)\n",
				    map->type, map->size, found_map->size);
				found_map->size = map->size;
			}

			drm_free(map, sizeof(*map), DRM_MEM_MAPS);
			*map_ptr = found_map;
			return 0;
		}

		if (drm_core_has_MTRR(dev)) {
			if (map->type == _DRM_FRAME_BUFFER ||
			    (map->flags & _DRM_WRITE_COMBINING)) {
				map->mtrr =  mtrr_add(map->offset, map->size,
						      MTRR_TYPE_WRCOMB, 1);
			}
		}
		if (map->type == _DRM_REGISTERS)
			map->handle = drm_ioremap(map->offset, map->size, dev);
		break;
	case _DRM_SHM:
		map->handle = vmalloc_32(map->size);
		DRM_DEBUG("%lu %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) {
			/* Prevent a 2nd X Server from creating a 2nd lock */
			if (dev->lock.hw_lock != NULL) {
				vfree(map->handle);
				drm_free(map, sizeof(*map), DRM_MEM_MAPS);
				return -EBUSY;
			}
			dev->sigdata.lock = dev->lock.hw_lock = map->handle;	/* Pointer to lock */
		}
		break;
	case _DRM_AGP:
		if (drm_core_has_AGP(dev)) {
#ifdef __alpha__
			map->offset += dev->hose->mem_space->start;
#endif
			map->offset += dev->agp->base;
			map->mtrr = dev->agp->agp_mtrr;	/* for getmap */
		}
		break;
	case _DRM_SCATTER_GATHER:
		if (!dev->sg) {
			drm_free(map, sizeof(*map), DRM_MEM_MAPS);
			return -EINVAL;
		}
		map->offset += dev->sg->handle;
		break;
	case _DRM_CONSISTENT: {
		/* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G.
		 * As we're limiting the address to 2^32-1 (or less),
		 * casting it down to 32 bits is no problem, but we
		 * need to point to a 64bit variable first. */
		dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL);
		if (!dmah) {
			drm_free(map, sizeof(*map), DRM_MEM_MAPS);
			return -ENOMEM;
		}
		map->handle = dmah->vaddr;
		map->offset = (unsigned long)dmah->busaddr;
		kfree(dmah);
		break;
	}
	default:
		drm_free(map, sizeof(*map), DRM_MEM_MAPS);
		return -EINVAL;
	}

	list = drm_alloc(sizeof(*list), DRM_MEM_MAPS);
	if (!list) {
		drm_free(map, sizeof(*map), DRM_MEM_MAPS);
		return -EINVAL;
	}
	memset(list, 0, sizeof(*list));
	list->map = map;

	down(&dev->struct_sem);
	list_add(&list->head, &dev->maplist->head);
#ifdef CONFIG_COMPAT
	/* Assign a 32-bit handle for _DRM_SHM mappings */
	/* We do it here so that dev->struct_sem protects the increment */
	if (map->type == _DRM_SHM)
		map->offset = map32_handle += PAGE_SIZE;
#endif

	up(&dev->struct_sem);

	*map_ptr = map;
	return 0;
}
EXPORT_SYMBOL(drm_addmap);

int drm_addmap_ioctl(struct inode *inode, struct file *filp,
		     unsigned int cmd, unsigned long arg)
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;
	drm_map_t map;
	drm_map_t *map_ptr;
	drm_map_t __user *argp = (void __user *)arg;
	int err;

	if (!(filp->f_mode & 3))
		return -EACCES;	/* Require read/write */

	if (copy_from_user(& map, argp, sizeof(map))) {
		return -EFAULT;
	}

	err = drm_addmap( dev, map.offset, map.size, map.type, map.flags,
			  & map_ptr );

	if (err) {
		return err;
	}

	if (copy_to_user(argp, map_ptr, sizeof(*map_ptr)))
		return -EFAULT;
	if (map_ptr->type != _DRM_SHM) {