drm_bufs.c 41.5 KB
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/**
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 * \file drm_bufs.c
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 * Generic buffer template
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 *
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 * \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"

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unsigned long drm_get_resource_start(drm_device_t *dev, unsigned int resource)
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{
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	return pci_resource_start(dev->pdev, resource);
}
EXPORT_SYMBOL(drm_get_resource_start);
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unsigned long drm_get_resource_len(drm_device_t *dev, unsigned int resource)
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{
	return pci_resource_len(dev->pdev, resource);
}
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EXPORT_SYMBOL(drm_get_resource_len);
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static drm_map_list_t *drm_find_matching_map(drm_device_t *dev,
					     drm_local_map_t *map)
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{
	struct list_head *list;
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	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) {
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			return entry;
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		}
	}

	return NULL;
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}

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/*
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 * Used to allocate 32-bit handles for mappings.
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 */
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#define START_RANGE 0x10000000
#define END_RANGE 0x40000000

#ifdef _LP64
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static __inline__ unsigned int HandleID(unsigned long lhandle,
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					drm_device_t *dev)
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{
	static unsigned int map32_handle = START_RANGE;
	unsigned int hash;

	if (lhandle & 0xffffffff00000000) {
		hash = map32_handle;
		map32_handle += PAGE_SIZE;
		if (map32_handle > END_RANGE)
			map32_handle = START_RANGE;
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	} else
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		hash = lhandle;

	while (1) {
		drm_map_list_t *_entry;
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		list_for_each_entry(_entry, &dev->maplist->head, head) {
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			if (_entry->user_token == hash)
				break;
		}
		if (&_entry->head == &dev->maplist->head)
			return hash;

		hash += PAGE_SIZE;
		map32_handle += PAGE_SIZE;
	}
}
#else
# define HandleID(x,dev) (unsigned int)(x)
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#endif

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/**
 * 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.
 */
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static int drm_addmap_core(drm_device_t * dev, unsigned int offset,
			   unsigned int size, drm_map_type_t type,
			   drm_map_flags_t flags, drm_map_list_t ** maplist)
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{
	drm_map_t *map;
	drm_map_list_t *list;
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	drm_dma_handle_t *dmah;
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	map = drm_alloc(sizeof(*map), DRM_MEM_MAPS);
	if (!map)
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		return -ENOMEM;

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	map->offset = offset;
	map->size = size;
	map->flags = flags;
	map->type = type;
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	/* 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.
	 */
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	if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
		drm_free(map, sizeof(*map), DRM_MEM_MAPS);
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		return -EINVAL;
	}
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	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);
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		return -EINVAL;
	}
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	map->mtrr = -1;
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	map->handle = NULL;

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	switch (map->type) {
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	case _DRM_REGISTERS:
	case _DRM_FRAME_BUFFER:
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#if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__)
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		if (map->offset + (map->size-1) < map->offset ||
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		    map->offset < virt_to_phys(high_memory)) {
			drm_free(map, sizeof(*map), DRM_MEM_MAPS);
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			return -EINVAL;
		}
#endif
#ifdef __alpha__
		map->offset += dev->hose->mem_space->start;
#endif
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		/* 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.
		 */
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		list = drm_find_matching_map(dev, map);
		if (list != NULL) {
			if (list->map->size != map->size) {
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				DRM_DEBUG("Matching maps of type %d with "
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					  "mismatched sizes, (%ld vs %ld)\n",
					  map->type, map->size,
					  list->map->size);
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				list->map->size = map->size;
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			}

			drm_free(map, sizeof(*map), DRM_MEM_MAPS);
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			*maplist = list;
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			return 0;
		}

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		if (drm_core_has_MTRR(dev)) {
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			if (map->type == _DRM_FRAME_BUFFER ||
			    (map->flags & _DRM_WRITE_COMBINING)) {
				map->mtrr = mtrr_add(map->offset, map->size,
						     MTRR_TYPE_WRCOMB, 1);
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			}
		}
		if (map->type == _DRM_REGISTERS)
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			map->handle = drm_ioremap(map->offset, map->size, dev);
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		break;

	case _DRM_SHM:
		map->handle = vmalloc_32(map->size);
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		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);
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			return -ENOMEM;
		}
		map->offset = (unsigned long)map->handle;
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		if (map->flags & _DRM_CONTAINS_LOCK) {
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			/* Prevent a 2nd X Server from creating a 2nd lock */
			if (dev->lock.hw_lock != NULL) {
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				vfree(map->handle);
				drm_free(map, sizeof(*map), DRM_MEM_MAPS);
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				return -EBUSY;
			}
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			dev->sigdata.lock = dev->lock.hw_lock = map->handle;	/* Pointer to lock */
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		}
		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;
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			map->mtrr = dev->agp->agp_mtrr;	/* for getmap */
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		}
		break;
	case _DRM_SCATTER_GATHER:
		if (!dev->sg) {
			drm_free(map, sizeof(*map), DRM_MEM_MAPS);
			return -EINVAL;
		}
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		map->offset += (unsigned long)dev->sg->virtual;
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		break;
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	case _DRM_CONSISTENT:
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		/* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
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		 * As we're limiting the address to 2^32-1 (or less),
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		 * casting it down to 32 bits is no problem, but we
		 * need to point to a 64bit variable first. */
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		dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL);
		if (!dmah) {
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			drm_free(map, sizeof(*map), DRM_MEM_MAPS);
			return -ENOMEM;
		}
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		map->handle = dmah->vaddr;
		map->offset = (unsigned long)dmah->busaddr;
		kfree(dmah);
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		break;
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	default:
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		drm_free(map, sizeof(*map), DRM_MEM_MAPS);
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		return -EINVAL;
	}

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

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	mutex_lock(&dev->struct_mutex);
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	list_add(&list->head, &dev->maplist->head);
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	/* Assign a 32-bit handle */
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	/* We do it here so that dev->struct_mutex protects the increment */
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	list->user_token = HandleID(map->type == _DRM_SHM
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				    ? (unsigned long)map->handle
				    : map->offset, dev);
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	mutex_unlock(&dev->struct_mutex);
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	*maplist = list;
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	return 0;
}
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int drm_addmap(drm_device_t * dev, unsigned int offset,
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	       unsigned int size, drm_map_type_t type,
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	       drm_map_flags_t flags, drm_local_map_t ** map_ptr)
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{
	drm_map_list_t *list;
	int rc;

	rc = drm_addmap_core(dev, offset, size, type, flags, &list);
	if (!rc)
		*map_ptr = list->map;
	return rc;
}
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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;
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	drm_map_list_t *maplist;
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	drm_map_t __user *argp = (void __user *)arg;
	int err;

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

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

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	if (!(capable(CAP_SYS_ADMIN) || map.type == _DRM_AGP))
		return -EPERM;

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	err = drm_addmap_core(dev, map.offset, map.size, map.type, map.flags,
			      &maplist);
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	if (err)
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		return err;
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	if (copy_to_user(argp, maplist->map, sizeof(drm_map_t)))
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		return -EFAULT;
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	/* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
	if (put_user((void *)(unsigned long)maplist->user_token, &argp->handle))
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		return -EFAULT;
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	return 0;
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}
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/**
 * Remove a map private from list and deallocate resources if the mapping
 * isn't in use.
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg pointer to a drm_map_t structure.
 * \return zero on success or a negative value on error.
 *
 * Searches the map on drm_device::maplist, removes it from the list, see if
 * its being used, and free any associate resource (such as MTRR's) if it's not
 * being on use.
 *
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 * \sa drm_addmap
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 */
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int drm_rmmap_locked(drm_device_t *dev, drm_local_map_t *map)
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{
	struct list_head *list;
	drm_map_list_t *r_list = NULL;
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	drm_dma_handle_t dmah;
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	/* Find the list entry for the map and remove it */
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	list_for_each(list, &dev->maplist->head) {
		r_list = list_entry(list, drm_map_list_t, head);

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		if (r_list->map == map) {
			list_del(list);
			drm_free(list, sizeof(*list), DRM_MEM_MAPS);
			break;
		}
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	}

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	/* List has wrapped around to the head pointer, or it's empty and we
	 * didn't find anything.
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	 */
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	if (list == (&dev->maplist->head)) {
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		return -EINVAL;
	}

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	switch (map->type) {
	case _DRM_REGISTERS:
		drm_ioremapfree(map->handle, map->size, dev);
		/* FALLTHROUGH */
	case _DRM_FRAME_BUFFER:
		if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
			int retcode;
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			retcode = mtrr_del(map->mtrr, map->offset, map->size);
			DRM_DEBUG("mtrr_del=%d\n", retcode);
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		}
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		break;
	case _DRM_SHM:
		vfree(map->handle);
		break;
	case _DRM_AGP:
	case _DRM_SCATTER_GATHER:
		break;
	case _DRM_CONSISTENT:
		dmah.vaddr = map->handle;
		dmah.busaddr = map->offset;
		dmah.size = map->size;
		__drm_pci_free(dev, &dmah);
		break;
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	}
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	drm_free(map, sizeof(*map), DRM_MEM_MAPS);

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	return 0;
}
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int drm_rmmap(drm_device_t *dev, drm_local_map_t *map)
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{
	int ret;

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	mutex_lock(&dev->struct_mutex);
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	ret = drm_rmmap_locked(dev, map);
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	mutex_unlock(&dev->struct_mutex);
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	return ret;
}
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/* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 * the last close of the device, and this is necessary for cleanup when things
 * exit uncleanly.  Therefore, having userland manually remove mappings seems
 * like a pointless exercise since they're going away anyway.
 *
 * One use case might be after addmap is allowed for normal users for SHM and
 * gets used by drivers that the server doesn't need to care about.  This seems
 * unlikely.
 */
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int drm_rmmap_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 request;
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	drm_local_map_t *map = NULL;
	struct list_head *list;
	int ret;
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	if (copy_from_user(&request, (drm_map_t __user *) arg, sizeof(request))) {
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		return -EFAULT;
	}

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	mutex_lock(&dev->struct_mutex);
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	list_for_each(list, &dev->maplist->head) {
		drm_map_list_t *r_list = list_entry(list, drm_map_list_t, head);

		if (r_list->map &&
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		    r_list->user_token == (unsigned long)request.handle &&
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		    r_list->map->flags & _DRM_REMOVABLE) {
			map = r_list->map;
			break;
		}
	}

	/* List has wrapped around to the head pointer, or its empty we didn't
	 * find anything.
	 */
	if (list == (&dev->maplist->head)) {
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		mutex_unlock(&dev->struct_mutex);
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		return -EINVAL;
	}

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	if (!map) {
		mutex_unlock(&dev->struct_mutex);
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		return -EINVAL;
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	}
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	/* Register and framebuffer maps are permanent */
	if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
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		mutex_unlock(&dev->struct_mutex);
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		return 0;
	}

	ret = drm_rmmap_locked(dev, map);

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	mutex_unlock(&dev->struct_mutex);
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	return ret;
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}
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/**
 * Cleanup after an error on one of the addbufs() functions.
 *
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 * \param dev DRM device.
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 * \param entry buffer entry where the error occurred.
 *
 * Frees any pages and buffers associated with the given entry.
 */
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static void drm_cleanup_buf_error(drm_device_t * dev, drm_buf_entry_t * entry)
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{
	int i;

	if (entry->seg_count) {
		for (i = 0; i < entry->seg_count; i++) {
			if (entry->seglist[i]) {
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				drm_pci_free(dev, entry->seglist[i]);
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			}
		}
		drm_free(entry->seglist,
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			 entry->seg_count *
			 sizeof(*entry->seglist), DRM_MEM_SEGS);
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		entry->seg_count = 0;
	}

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	if (entry->buf_count) {
		for (i = 0; i < entry->buf_count; i++) {
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			if (entry->buflist[i].dev_private) {
				drm_free(entry->buflist[i].dev_private,
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					 entry->buflist[i].dev_priv_size,
					 DRM_MEM_BUFS);
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			}
		}
		drm_free(entry->buflist,
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			 entry->buf_count *
			 sizeof(*entry->buflist), DRM_MEM_BUFS);
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		entry->buf_count = 0;
	}
}

#if __OS_HAS_AGP
/**
505
 * Add AGP buffers for DMA transfers.
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 *
507 508
 * \param dev drm_device_t to which the buffers are to be added.
 * \param request pointer to a drm_buf_desc_t describing the request.
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 * \return zero on success or a negative number on failure.
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 *
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 * After some sanity checks creates a drm_buf structure for each buffer and
 * reallocates the buffer list of the same size order to accommodate the new
 * buffers.
 */
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int drm_addbufs_agp(drm_device_t * dev, drm_buf_desc_t * request)
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{
	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;

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	if (!dma)
		return -EINVAL;
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535 536
	count = request->count;
	order = drm_order(request->size);
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	size = 1 << order;

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	alignment = (request->flags & _DRM_PAGE_ALIGN)
	    ? PAGE_ALIGN(size) : size;
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	page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
	total = PAGE_SIZE << page_order;

	byte_count = 0;
545
	agp_offset = dev->agp->base + request->agp_start;
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	DRM_DEBUG("count:      %d\n", count);
	DRM_DEBUG("order:      %d\n", order);
	DRM_DEBUG("size:       %d\n", size);
550
	DRM_DEBUG("agp_offset: %lx\n", agp_offset);
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	DRM_DEBUG("alignment:  %d\n", alignment);
	DRM_DEBUG("page_order: %d\n", page_order);
	DRM_DEBUG("total:      %d\n", total);
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	if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
		return -EINVAL;
	if (dev->queue_count)
		return -EBUSY;	/* Not while in use */
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	spin_lock(&dev->count_lock);
	if (dev->buf_use) {
		spin_unlock(&dev->count_lock);
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		return -EBUSY;
	}
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	atomic_inc(&dev->buf_alloc);
	spin_unlock(&dev->count_lock);
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	mutex_lock(&dev->struct_mutex);
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	entry = &dma->bufs[order];
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	if (entry->buf_count) {
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		mutex_unlock(&dev->struct_mutex);
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		atomic_dec(&dev->buf_alloc);
		return -ENOMEM;	/* May only call once for each order */
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	}

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

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	entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
				   DRM_MEM_BUFS);
	if (!entry->buflist) {
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		mutex_unlock(&dev->struct_mutex);
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		atomic_dec(&dev->buf_alloc);
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		return -ENOMEM;
	}
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	memset(entry->buflist, 0, count * sizeof(*entry->buflist));
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	entry->buf_size = size;
	entry->page_order = page_order;

	offset = 0;

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	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;
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		buf->offset = (dma->byte_count + offset);
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		buf->bus_address = agp_offset + offset;
		buf->address = (void *)(agp_offset + offset);
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		buf->next = NULL;
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		buf->waiting = 0;
		buf->pending = 0;
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		init_waitqueue_head(&buf->dma_wait);
		buf->filp = NULL;
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		buf->dev_priv_size = dev->driver->dev_priv_size;
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		buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
		if (!buf->dev_private) {
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			/* Set count correctly so we free the proper amount. */
			entry->buf_count = count;
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			drm_cleanup_buf_error(dev, entry);
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			mutex_unlock(&dev->struct_mutex);
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			atomic_dec(&dev->buf_alloc);
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			return -ENOMEM;
		}
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		memset(buf->dev_private, 0, buf->dev_priv_size);
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		DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
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		offset += alignment;
		entry->buf_count++;
		byte_count += PAGE_SIZE << page_order;
	}

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	DRM_DEBUG("byte_count: %d\n", byte_count);
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	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) {
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		/* Free the entry because it isn't valid */
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		drm_cleanup_buf_error(dev, entry);
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		mutex_unlock(&dev->struct_mutex);
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		atomic_dec(&dev->buf_alloc);
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		return -ENOMEM;
	}
	dma->buflist = temp_buflist;

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

	dma->buf_count += entry->buf_count;
651 652
	dma->seg_count += entry->seg_count;
	dma->page_count += byte_count >> PAGE_SHIFT;
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	dma->byte_count += byte_count;

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	DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
	DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
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	mutex_unlock(&dev->struct_mutex);
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660 661
	request->count = entry->buf_count;
	request->size = size;
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	dma->flags = _DRM_DMA_USE_AGP;

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	atomic_dec(&dev->buf_alloc);
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	return 0;
}
668
EXPORT_SYMBOL(drm_addbufs_agp);
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#endif				/* __OS_HAS_AGP */
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int drm_addbufs_pci(drm_device_t * dev, drm_buf_desc_t * request)
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{
	drm_device_dma_t *dma = dev->dma;
	int count;
	int order;
	int size;
	int total;
	int page_order;
	drm_buf_entry_t *entry;
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	drm_dma_handle_t *dmah;
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	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;

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	if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
		return -EINVAL;
692

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	if (!dma)
		return -EINVAL;
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696 697 698
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

699 700
	count = request->count;
	order = drm_order(request->size);
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	size = 1 << order;

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	DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
		  request->count, request->size, size, order, dev->queue_count);
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	if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
		return -EINVAL;
	if (dev->queue_count)
		return -EBUSY;	/* Not while in use */
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711
	alignment = (request->flags & _DRM_PAGE_ALIGN)
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	    ? PAGE_ALIGN(size) : size;
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	page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
	total = PAGE_SIZE << page_order;

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	spin_lock(&dev->count_lock);
	if (dev->buf_use) {
		spin_unlock(&dev->count_lock);
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		return -EBUSY;
	}
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	atomic_inc(&dev->buf_alloc);
	spin_unlock(&dev->count_lock);
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723

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	mutex_lock(&dev->struct_mutex);
L
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	entry = &dma->bufs[order];
D
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	if (entry->buf_count) {
D
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		mutex_unlock(&dev->struct_mutex);
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		atomic_dec(&dev->buf_alloc);
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		return -ENOMEM;	/* May only call once for each order */
	}

	if (count < 0 || count > 4096) {
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		mutex_unlock(&dev->struct_mutex);
D
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		atomic_dec(&dev->buf_alloc);
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		return -EINVAL;
	}

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	entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
				   DRM_MEM_BUFS);
	if (!entry->buflist) {
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		mutex_unlock(&dev->struct_mutex);
D
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742
		atomic_dec(&dev->buf_alloc);
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		return -ENOMEM;
	}
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	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);
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		mutex_unlock(&dev->struct_mutex);
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		atomic_dec(&dev->buf_alloc);
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		return -ENOMEM;
	}
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	memset(entry->seglist, 0, count * sizeof(*entry->seglist));
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	/* Keep the original pagelist until we know all the allocations
	 * have succeeded
	 */
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	temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
				  * sizeof(*dma->pagelist), DRM_MEM_PAGES);
L
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	if (!temp_pagelist) {
D
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		drm_free(entry->buflist,
			 count * sizeof(*entry->buflist), DRM_MEM_BUFS);
		drm_free(entry->seglist,
			 count * sizeof(*entry->seglist), DRM_MEM_SEGS);
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		mutex_unlock(&dev->struct_mutex);
D
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		atomic_dec(&dev->buf_alloc);
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		return -ENOMEM;
	}
	memcpy(temp_pagelist,
D
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	       dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
	DRM_DEBUG("pagelist: %d entries\n",
		  dma->page_count + (count << page_order));
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	entry->buf_size = size;
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	entry->page_order = page_order;
	byte_count = 0;
	page_count = 0;

D
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	while (entry->buf_count < count) {
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		dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, 0xfffffffful);
		
		if (!dmah) {
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			/* Set count correctly so we free the proper amount. */
			entry->buf_count = count;
			entry->seg_count = count;
			drm_cleanup_buf_error(dev, entry);
D
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			drm_free(temp_pagelist,
				 (dma->page_count + (count << page_order))
				 * sizeof(*dma->pagelist), DRM_MEM_PAGES);
D
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794
			mutex_unlock(&dev->struct_mutex);
D
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795
			atomic_dec(&dev->buf_alloc);
L
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			return -ENOMEM;
		}
D
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		entry->seglist[entry->seg_count++] = dmah;
D
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799 800 801
		for (i = 0; i < (1 << page_order); i++) {
			DRM_DEBUG("page %d @ 0x%08lx\n",
				  dma->page_count + page_count,
D
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802
				  (unsigned long)dmah->vaddr + PAGE_SIZE * i);
L
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			temp_pagelist[dma->page_count + page_count++]
D
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				= (unsigned long)dmah->vaddr + PAGE_SIZE * i;
L
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805
		}
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806 807 808 809 810 811 812 813 814
		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);
D
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			buf->address = (void *)(dmah->vaddr + offset);
			buf->bus_address = dmah->busaddr + offset;
D
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			buf->next = NULL;
L
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			buf->waiting = 0;
			buf->pending = 0;
D
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			init_waitqueue_head(&buf->dma_wait);
			buf->filp = NULL;
L
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822 823

			buf->dev_priv_size = dev->driver->dev_priv_size;
D
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			buf->dev_private = drm_alloc(buf->dev_priv_size,
						     DRM_MEM_BUFS);
			if (!buf->dev_private) {
L
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				/* Set count correctly so we free the proper amount. */
				entry->buf_count = count;
				entry->seg_count = count;
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				drm_cleanup_buf_error(dev, entry);
				drm_free(temp_pagelist,
					 (dma->page_count +
					  (count << page_order))
					 * sizeof(*dma->pagelist),
					 DRM_MEM_PAGES);
D
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836
				mutex_unlock(&dev->struct_mutex);
D
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837
				atomic_dec(&dev->buf_alloc);
L
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				return -ENOMEM;
			}
D
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			memset(buf->dev_private, 0, buf->dev_priv_size);
L
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			DRM_DEBUG("buffer %d @ %p\n",
				  entry->buf_count, buf->address);
L
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844 845 846 847
		}
		byte_count += PAGE_SIZE << page_order;
	}

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848 849 850 851
	temp_buflist = drm_realloc(dma->buflist,
				   dma->buf_count * sizeof(*dma->buflist),
				   (dma->buf_count + entry->buf_count)
				   * sizeof(*dma->buflist), DRM_MEM_BUFS);
L
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	if (!temp_buflist) {
		/* Free the entry because it isn't valid */
D
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854 855 856 857
		drm_cleanup_buf_error(dev, entry);
		drm_free(temp_pagelist,
			 (dma->page_count + (count << page_order))
			 * sizeof(*dma->pagelist), DRM_MEM_PAGES);
D
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		mutex_unlock(&dev->struct_mutex);
D
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859
		atomic_dec(&dev->buf_alloc);
L
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		return -ENOMEM;
	}
	dma->buflist = temp_buflist;

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	for (i = 0; i < entry->buf_count; i++) {
L
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		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,
D
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			 dma->page_count * sizeof(*dma->pagelist),
			 DRM_MEM_PAGES);
L
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	}
	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);

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	mutex_unlock(&dev->struct_mutex);
L
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885 886
	request->count = entry->buf_count;
	request->size = size;
L
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D
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	atomic_dec(&dev->buf_alloc);
L
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	return 0;

}
892
EXPORT_SYMBOL(drm_addbufs_pci);
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894
static int drm_addbufs_sg(drm_device_t * dev, drm_buf_desc_t * request)
L
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{
	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;

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

	if (!dma)
		return -EINVAL;
L
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917 918 919
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

920 921
	count = request->count;
	order = drm_order(request->size);
L
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	size = 1 << order;

D
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	alignment = (request->flags & _DRM_PAGE_ALIGN)
	    ? PAGE_ALIGN(size) : size;
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	page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
	total = PAGE_SIZE << page_order;

	byte_count = 0;
930
	agp_offset = request->agp_start;
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	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);
L
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	if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
		return -EINVAL;
	if (dev->queue_count)
		return -EBUSY;	/* Not while in use */
L
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	spin_lock(&dev->count_lock);
	if (dev->buf_use) {
		spin_unlock(&dev->count_lock);
L
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		return -EBUSY;
	}
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	atomic_inc(&dev->buf_alloc);
	spin_unlock(&dev->count_lock);
L
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D
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	mutex_lock(&dev->struct_mutex);
L
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	entry = &dma->bufs[order];
D
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	if (entry->buf_count) {
D
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		mutex_unlock(&dev->struct_mutex);
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		atomic_dec(&dev->buf_alloc);
		return -ENOMEM;	/* May only call once for each order */
L
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	}

	if (count < 0 || count > 4096) {
D
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		mutex_unlock(&dev->struct_mutex);
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		atomic_dec(&dev->buf_alloc);
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		return -EINVAL;
	}

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	entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
				   DRM_MEM_BUFS);
	if (!entry->buflist) {
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		mutex_unlock(&dev->struct_mutex);
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		atomic_dec(&dev->buf_alloc);
L
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		return -ENOMEM;
	}
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	memset(entry->buflist, 0, count * sizeof(*entry->buflist));
L
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	entry->buf_size = size;
	entry->page_order = page_order;

	offset = 0;

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	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;
L
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D
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		buf->offset = (dma->byte_count + offset);
L
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		buf->bus_address = agp_offset + offset;
D
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		buf->address = (void *)(agp_offset + offset
991
					+ (unsigned long)dev->sg->virtual);
D
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		buf->next = NULL;
L
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		buf->waiting = 0;
		buf->pending = 0;
D
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		init_waitqueue_head(&buf->dma_wait);
		buf->filp = NULL;
L
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		buf->dev_priv_size = dev->driver->dev_priv_size;
D
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		buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
		if (!buf->dev_private) {
L
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			/* Set count correctly so we free the proper amount. */
			entry->buf_count = count;
D
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			drm_cleanup_buf_error(dev, entry);
D
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			mutex_unlock(&dev->struct_mutex);
D
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			atomic_dec(&dev->buf_alloc);
L
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			return -ENOMEM;
		}

D
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		memset(buf->dev_private, 0, buf->dev_priv_size);
L
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D
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		DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
L
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		offset += alignment;
		entry->buf_count++;
		byte_count += PAGE_SIZE << page_order;
	}

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	DRM_DEBUG("byte_count: %d\n", byte_count);
L
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	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) {
L
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		/* Free the entry because it isn't valid */
D
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		drm_cleanup_buf_error(dev, entry);
D
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		mutex_unlock(&dev->struct_mutex);
D
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		atomic_dec(&dev->buf_alloc);
L
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1029 1030 1031 1032
		return -ENOMEM;
	}
	dma->buflist = temp_buflist;

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

	dma->buf_count += entry->buf_count;
1038 1039
	dma->seg_count += entry->seg_count;
	dma->page_count += byte_count >> PAGE_SHIFT;
L
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	dma->byte_count += byte_count;

D
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	DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
	DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
L
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D
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	mutex_unlock(&dev->struct_mutex);
L
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1047 1048
	request->count = entry->buf_count;
	request->size = size;
L
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	dma->flags = _DRM_DMA_USE_SG;

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

D
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static int drm_addbufs_fb(drm_device_t * dev, drm_buf_desc_t * request)
D
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{
	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_FB_DMA))
		return -EINVAL;
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	if (!dma)
		return -EINVAL;

1079 1080 1081
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

1082 1083
	count = request->count;
	order = drm_order(request->size);
D
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	size = 1 << order;

1086
	alignment = (request->flags & _DRM_PAGE_ALIGN)
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	    ? PAGE_ALIGN(size) : size;
	page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
	total = PAGE_SIZE << page_order;

	byte_count = 0;
1092
	agp_offset = request->agp_start;
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	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);

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	mutex_lock(&dev->struct_mutex);
D
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	entry = &dma->bufs[order];
	if (entry->buf_count) {
D
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1118
		mutex_unlock(&dev->struct_mutex);
D
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1119 1120 1121 1122 1123
		atomic_dec(&dev->buf_alloc);
		return -ENOMEM;	/* May only call once for each order */
	}

	if (count < 0 || count > 4096) {
D
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		mutex_unlock(&dev->struct_mutex);
D
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		atomic_dec(&dev->buf_alloc);
		return -EINVAL;
	}

	entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
				   DRM_MEM_BUFS);
	if (!entry->buflist) {
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		mutex_unlock(&dev->struct_mutex);
D
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1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164
		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);
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			mutex_unlock(&dev->struct_mutex);
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			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);
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		mutex_unlock(&dev->struct_mutex);
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		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;
1198 1199
	dma->seg_count += entry->seg_count;
	dma->page_count += byte_count >> PAGE_SHIFT;
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	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);

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	mutex_unlock(&dev->struct_mutex);
D
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1207 1208
	request->count = entry->buf_count;
	request->size = size;
D
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1209 1210 1211 1212 1213 1214

	dma->flags = _DRM_DMA_USE_FB;

	atomic_dec(&dev->buf_alloc);
	return 0;
}
1215

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L
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/**
 * Add buffers for DMA transfers (ioctl).
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg pointer to a drm_buf_desc_t request.
 * \return zero on success or a negative number on failure.
 *
 * According with the memory type specified in drm_buf_desc::flags and the
 * build options, it dispatches the call either to addbufs_agp(),
 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
 * PCI memory respectively.
 */
D
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int drm_addbufs(struct inode *inode, struct file *filp,
		unsigned int cmd, unsigned long arg)
L
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1233 1234 1235 1236
{
	drm_buf_desc_t request;
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;
1237
	int ret;
D
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L
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1239 1240 1241
	if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
		return -EINVAL;

D
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1242 1243
	if (copy_from_user(&request, (drm_buf_desc_t __user *) arg,
			   sizeof(request)))
L
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1244 1245 1246
		return -EFAULT;

#if __OS_HAS_AGP
D
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	if (request.flags & _DRM_AGP_BUFFER)
		ret = drm_addbufs_agp(dev, &request);
L
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1249 1250
	else
#endif
D
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1251 1252 1253 1254
	if (request.flags & _DRM_SG_BUFFER)
		ret = drm_addbufs_sg(dev, &request);
	else if (request.flags & _DRM_FB_BUFFER)
		ret = drm_addbufs_fb(dev, &request);
L
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1255
	else
D
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1256
		ret = drm_addbufs_pci(dev, &request);
1257

D
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1258 1259
	if (ret == 0) {
		if (copy_to_user((void __user *)arg, &request, sizeof(request))) {
1260 1261 1262 1263
			ret = -EFAULT;
		}
	}
	return ret;
L
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}

/**
 * Get information about the buffer mappings.
 *
 * This was originally mean for debugging purposes, or by a sophisticated
 * client library to determine how best to use the available buffers (e.g.,
 * large buffers can be used for image transfer).
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg pointer to a drm_buf_info structure.
 * \return zero on success or a negative number on failure.
 *
 * Increments drm_device::buf_use while holding the drm_device::count_lock
 * lock, preventing of allocating more buffers after this call. Information
 * about each requested buffer is then copied into user space.
 */
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int drm_infobufs(struct inode *inode, struct file *filp,
		 unsigned int cmd, unsigned long arg)
L
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1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;
	drm_device_dma_t *dma = dev->dma;
	drm_buf_info_t request;
	drm_buf_info_t __user *argp = (void __user *)arg;
	int i;
	int count;

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

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	if (!dma)
		return -EINVAL;
L
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D
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	spin_lock(&dev->count_lock);
	if (atomic_read(&dev->buf_alloc)) {
		spin_unlock(&dev->count_lock);
L
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		return -EBUSY;
	}
	++dev->buf_use;		/* Can't allocate more after this call */
D
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	spin_unlock(&dev->count_lock);
L
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D
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1308
	if (copy_from_user(&request, argp, sizeof(request)))
L
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1309 1310
		return -EFAULT;

D
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1311 1312 1313
	for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
		if (dma->bufs[i].buf_count)
			++count;
L
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1314 1315
	}

D
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	DRM_DEBUG("count = %d\n", count);
L
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1317

D
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	if (request.count >= count) {
		for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
			if (dma->bufs[i].buf_count) {
				drm_buf_desc_t __user *to =
				    &request.list[count];
L
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				drm_buf_entry_t *from = &dma->bufs[i];
				drm_freelist_t *list = &dma->bufs[i].freelist;
D
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				if (copy_to_user(&to->count,
						 &from->buf_count,
						 sizeof(from->buf_count)) ||
				    copy_to_user(&to->size,
						 &from->buf_size,
						 sizeof(from->buf_size)) ||
				    copy_to_user(&to->low_mark,
						 &list->low_mark,
						 sizeof(list->low_mark)) ||
				    copy_to_user(&to->high_mark,
						 &list->high_mark,
						 sizeof(list->high_mark)))
L
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					return -EFAULT;

D
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1339 1340 1341 1342 1343 1344
				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);
L
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				++count;
			}
		}
	}
	request.count = count;

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	if (copy_to_user(argp, &request, sizeof(request)))
L
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		return -EFAULT;

	return 0;
}

/**
 * Specifies a low and high water mark for buffer allocation
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg a pointer to a drm_buf_desc structure.
 * \return zero on success or a negative number on failure.
 *
 * Verifies that the size order is bounded between the admissible orders and
 * updates the respective drm_device_dma::bufs entry low and high water mark.
 *
 * \note This ioctl is deprecated and mostly never used.
 */
D
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int drm_markbufs(struct inode *inode, struct file *filp,
		 unsigned int cmd, unsigned long arg)
L
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{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;
	drm_device_dma_t *dma = dev->dma;
	drm_buf_desc_t request;
	int order;
	drm_buf_entry_t *entry;

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

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	if (!dma)
		return -EINVAL;
L
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D
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	if (copy_from_user(&request,
			   (drm_buf_desc_t __user *) arg, sizeof(request)))
L
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		return -EFAULT;

D
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	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;
L
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	entry = &dma->bufs[order];

D
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	if (request.low_mark < 0 || request.low_mark > entry->buf_count)
L
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		return -EINVAL;
D
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	if (request.high_mark < 0 || request.high_mark > entry->buf_count)
L
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1401 1402
		return -EINVAL;

D
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	entry->freelist.low_mark = request.low_mark;
L
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	entry->freelist.high_mark = request.high_mark;

	return 0;
}

/**
D
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 * Unreserve the buffers in list, previously reserved using drmDMA.
L
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 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg pointer to a drm_buf_free structure.
 * \return zero on success or a negative number on failure.
D
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 *
L
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 * Calls free_buffer() for each used buffer.
 * This function is primarily used for debugging.
 */
D
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int drm_freebufs(struct inode *inode, struct file *filp,
		 unsigned int cmd, unsigned long arg)
L
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{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;
	drm_device_dma_t *dma = dev->dma;
	drm_buf_free_t request;
	int i;
	int idx;
	drm_buf_t *buf;

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

D
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	if (!dma)
		return -EINVAL;
L
Linus Torvalds 已提交
1437

D
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1438 1439
	if (copy_from_user(&request,
			   (drm_buf_free_t __user *) arg, sizeof(request)))
L
Linus Torvalds 已提交
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		return -EFAULT;

D
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	DRM_DEBUG("%d\n", request.count);
	for (i = 0; i < request.count; i++) {
		if (copy_from_user(&idx, &request.list[i], sizeof(idx)))
L
Linus Torvalds 已提交
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			return -EFAULT;
D
Dave Airlie 已提交
1446 1447 1448
		if (idx < 0 || idx >= dma->buf_count) {
			DRM_ERROR("Index %d (of %d max)\n",
				  idx, dma->buf_count - 1);
L
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1449 1450 1451
			return -EINVAL;
		}
		buf = dma->buflist[idx];
D
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		if (buf->filp != filp) {
			DRM_ERROR("Process %d freeing buffer not owned\n",
				  current->pid);
L
Linus Torvalds 已提交
1455 1456
			return -EINVAL;
		}
D
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1457
		drm_free_buffer(dev, buf);
L
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	}

	return 0;
}

/**
 * Maps all of the DMA buffers into client-virtual space (ioctl).
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg pointer to a drm_buf_map structure.
 * \return zero on success or a negative number on failure.
 *
 * Maps the AGP or SG buffer region with do_mmap(), and copies information
 * about each buffer into user space. The PCI buffers are already mapped on the
 * addbufs_pci() call.
 */
D
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int drm_mapbufs(struct inode *inode, struct file *filp,
		unsigned int cmd, unsigned long arg)
L
Linus Torvalds 已提交
1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;
	drm_device_dma_t *dma = dev->dma;
	drm_buf_map_t __user *argp = (void __user *)arg;
	int retcode = 0;
	const int zero = 0;
	unsigned long virtual;
	unsigned long address;
	drm_buf_map_t request;
	int i;

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

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	if (!dma)
		return -EINVAL;
L
Linus Torvalds 已提交
1495

D
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1496 1497 1498
	spin_lock(&dev->count_lock);
	if (atomic_read(&dev->buf_alloc)) {
		spin_unlock(&dev->count_lock);
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		return -EBUSY;
	}
	dev->buf_use++;		/* Can't allocate more after this call */
D
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1502
	spin_unlock(&dev->count_lock);
L
Linus Torvalds 已提交
1503

D
Dave Airlie 已提交
1504
	if (copy_from_user(&request, argp, sizeof(request)))
L
Linus Torvalds 已提交
1505 1506
		return -EFAULT;

D
Dave Airlie 已提交
1507
	if (request.count >= dma->buf_count) {
D
Dave Airlie 已提交
1508
		if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
D
Dave Airlie 已提交
1509
		    || (drm_core_check_feature(dev, DRIVER_SG)
D
Dave Airlie 已提交
1510 1511 1512
			&& (dma->flags & _DRM_DMA_USE_SG))
		    || (drm_core_check_feature(dev, DRIVER_FB_DMA)
			&& (dma->flags & _DRM_DMA_USE_FB))) {
L
Linus Torvalds 已提交
1513
			drm_map_t *map = dev->agp_buffer_map;
1514
			unsigned long token = dev->agp_buffer_token;
L
Linus Torvalds 已提交
1515

D
Dave Airlie 已提交
1516
			if (!map) {
L
Linus Torvalds 已提交
1517 1518 1519 1520
				retcode = -EINVAL;
				goto done;
			}

D
Dave Airlie 已提交
1521 1522 1523 1524 1525
			down_write(&current->mm->mmap_sem);
			virtual = do_mmap(filp, 0, map->size,
					  PROT_READ | PROT_WRITE,
					  MAP_SHARED, token);
			up_write(&current->mm->mmap_sem);
L
Linus Torvalds 已提交
1526
		} else {
D
Dave Airlie 已提交
1527 1528 1529 1530 1531
			down_write(&current->mm->mmap_sem);
			virtual = do_mmap(filp, 0, dma->byte_count,
					  PROT_READ | PROT_WRITE,
					  MAP_SHARED, 0);
			up_write(&current->mm->mmap_sem);
L
Linus Torvalds 已提交
1532
		}
D
Dave Airlie 已提交
1533
		if (virtual > -1024UL) {
L
Linus Torvalds 已提交
1534 1535 1536 1537 1538 1539
			/* Real error */
			retcode = (signed long)virtual;
			goto done;
		}
		request.virtual = (void __user *)virtual;

D
Dave Airlie 已提交
1540 1541 1542 1543
		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))) {
L
Linus Torvalds 已提交
1544 1545 1546
				retcode = -EFAULT;
				goto done;
			}
D
Dave Airlie 已提交
1547 1548 1549
			if (copy_to_user(&request.list[i].total,
					 &dma->buflist[i]->total,
					 sizeof(request.list[0].total))) {
L
Linus Torvalds 已提交
1550 1551 1552
				retcode = -EFAULT;
				goto done;
			}
D
Dave Airlie 已提交
1553 1554
			if (copy_to_user(&request.list[i].used,
					 &zero, sizeof(zero))) {
L
Linus Torvalds 已提交
1555 1556 1557
				retcode = -EFAULT;
				goto done;
			}
D
Dave Airlie 已提交
1558 1559 1560
			address = virtual + dma->buflist[i]->offset;	/* *** */
			if (copy_to_user(&request.list[i].address,
					 &address, sizeof(address))) {
L
Linus Torvalds 已提交
1561 1562 1563 1564 1565
				retcode = -EFAULT;
				goto done;
			}
		}
	}
D
Dave Airlie 已提交
1566
      done:
L
Linus Torvalds 已提交
1567
	request.count = dma->buf_count;
D
Dave Airlie 已提交
1568
	DRM_DEBUG("%d buffers, retcode = %d\n", request.count, retcode);
L
Linus Torvalds 已提交
1569

D
Dave Airlie 已提交
1570
	if (copy_to_user(argp, &request, sizeof(request)))
L
Linus Torvalds 已提交
1571 1572 1573 1574 1575
		return -EFAULT;

	return retcode;
}

D
Dave Airlie 已提交
1576 1577 1578
/**
 * Compute size order.  Returns the exponent of the smaller power of two which
 * is greater or equal to given number.
D
Dave Airlie 已提交
1579
 *
D
Dave Airlie 已提交
1580 1581 1582 1583 1584
 * \param size size.
 * \return order.
 *
 * \todo Can be made faster.
 */
D
Dave Airlie 已提交
1585
int drm_order(unsigned long size)
D
Dave Airlie 已提交
1586 1587 1588 1589
{
	int order;
	unsigned long tmp;

D
Dave Airlie 已提交
1590
	for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
D
Dave Airlie 已提交
1591 1592 1593 1594 1595 1596 1597

	if (size & (size - 1))
		++order;

	return order;
}
EXPORT_SYMBOL(drm_order);
1598 1599