xref: /freebsd-11-stable/sys/dev/drm/drm_bufs.c

/* drm_bufs.h -- Generic buffer template -*- linux-c -*-
 * 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.
 *
 * Authors:
 *    Rickard E. (Rik) Faith <faith@valinux.com>
 *    Gareth Hughes <gareth@valinux.com>
 *
 * $FreeBSD: head/sys/dev/drm/drm_bufs.c 145478 2005-04-24 19:03:32Z anholt $
 */

#include "dev/drm/drmP.h"

/*
 * Compute order.  Can be made faster.
 */
int drm_order(unsigned long size)
{
	int order;
	unsigned long tmp;

	for ( order = 0, tmp = size ; tmp >>= 1 ; ++order );

	if ( size & ~(1 << order) )
		++order;

	return order;
}

unsigned long drm_get_resource_start(drm_device_t *dev, unsigned int resource)
{
	struct resource *bsr;
	unsigned long offset;

	resource = resource * 4 + 0x10;

	bsr = bus_alloc_resource_any(dev->device, SYS_RES_MEMORY, &resource,
	    RF_ACTIVE | RF_SHAREABLE);
	if (bsr == NULL) {
		DRM_ERROR("Couldn't find resource 0x%x\n", resource);
		return 0;
	}

	offset = rman_get_start(bsr);

	bus_release_resource(dev->device, SYS_RES_MEMORY, resource, bsr);

	return offset;
}

unsigned long drm_get_resource_len(drm_device_t *dev, unsigned int resource)
{
	struct resource *bsr;
	unsigned long len;

	resource = resource * 4 + 0x10;

	bsr = bus_alloc_resource_any(dev->device, SYS_RES_MEMORY, &resource,
	    RF_ACTIVE | RF_SHAREABLE);
	if (bsr == NULL) {
		DRM_ERROR("Couldn't find resource 0x%x\n", resource);
		return ENOMEM;
	}

	len = rman_get_size(bsr);

	bus_release_resource(dev->device, SYS_RES_MEMORY, resource, bsr);

	return len;
}

int drm_initmap(drm_device_t *dev, unsigned long start, unsigned long len,
		unsigned int resource, int type, int flags)
{
	drm_local_map_t *map;
	struct resource *bsr;

	if (type != _DRM_REGISTERS && type != _DRM_FRAME_BUFFER)
		return EINVAL;
	if (len == 0)
		return EINVAL;

	map = malloc(sizeof(*map), M_DRM, M_ZERO | M_NOWAIT);
	if (map == NULL)
		return ENOMEM;

	map->rid = resource * 4 + 0x10;
	bsr = bus_alloc_resource_any(dev->device, SYS_RES_MEMORY, &map->rid,
	    RF_ACTIVE | RF_SHAREABLE);
	if (bsr == NULL) {
		DRM_ERROR("Couldn't allocate %s resource\n",
		    ((type == _DRM_REGISTERS) ? "mmio" : "framebuffer"));
		free(map, M_DRM);
		return ENOMEM;
	}

	map->kernel_owned = 1;
	map->type = type;
	map->flags = flags;
	map->bsr = bsr;
	map->bst = rman_get_bustag(bsr);
	map->bsh = rman_get_bushandle(bsr);
	map->offset = start;
	map->size = len;

	if (type == _DRM_REGISTERS)
		map->handle = rman_get_virtual(bsr);

	DRM_DEBUG("initmap %d,0x%x@0x%lx/0x%lx\n", map->type, map->flags,
	    map->offset, map->size);

	if (map->flags & _DRM_WRITE_COMBINING) {
		int err;

		err = drm_mtrr_add(map->offset, map->size, DRM_MTRR_WC);
		if (err == 0)
			map->mtrr = 1;
	}

	DRM_LOCK();
	TAILQ_INSERT_TAIL(&dev->maplist, map, link);
	DRM_UNLOCK();

	return 0;
}

int drm_addmap(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_map_t request;
	drm_local_map_t *map;
	dma_addr_t bus_addr;

	if (!(dev->flags & (FREAD|FWRITE)))
		return DRM_ERR(EACCES); /* Require read/write */

	DRM_COPY_FROM_USER_IOCTL( request, (drm_map_t *)data, sizeof(drm_map_t) );

	/* 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 ((request.flags & _DRM_REMOVABLE) && request.type != _DRM_SHM)
		return EINVAL;
	if ((request.offset & PAGE_MASK) || (request.size & PAGE_MASK))
		return EINVAL;
	if (request.offset + request.size < request.offset)
		return EINVAL;

	DRM_DEBUG("offset = 0x%08lx, size = 0x%08lx, type = %d\n",
	    request.offset, request.size, request.type);

	/* Check if this is just another version of a kernel-allocated map, and
	 * just hand that back if so.
	 */
	if (request.type == _DRM_REGISTERS || request.type == _DRM_FRAME_BUFFER)
	{
		DRM_LOCK();
		TAILQ_FOREACH(map, &dev->maplist, link) {
			if (map->kernel_owned && map->type == request.type &&
			    map->offset == request.offset) {
				/* XXX: this size setting is questionable. */
				map->size = request.size;
				DRM_DEBUG("Found kernel map %d\n", request.type);
				goto done;
			}
		}
		DRM_UNLOCK();
	}

	/* Allocate a new map structure, fill it in, and do any type-specific
	 * initialization necessary.
	 */
	map = malloc(sizeof(*map), M_DRM, M_ZERO | M_NOWAIT);
	if ( !map )
		return DRM_ERR(ENOMEM);

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

	switch ( map->type ) {
	case _DRM_REGISTERS:
		map->handle = drm_ioremap(dev, map);
		if (!(map->flags & _DRM_WRITE_COMBINING))
			break;
		/* FALLTHROUGH */
	case _DRM_FRAME_BUFFER:
		if (drm_mtrr_add(map->offset, map->size, DRM_MTRR_WC) == 0)
			map->mtrr = 1;
		break;
	case _DRM_SHM:
		map->handle = malloc(map->size, M_DRM, M_NOWAIT);
		DRM_DEBUG( "%lu %d %p\n",
			   map->size, drm_order(map->size), map->handle );
		if ( !map->handle ) {
			free(map, M_DRM);
			return DRM_ERR(ENOMEM);
		}
		map->offset = (unsigned long)map->handle;
		if ( map->flags & _DRM_CONTAINS_LOCK ) {
			/* Prevent a 2nd X Server from creating a 2nd lock */
			DRM_LOCK();
			if (dev->lock.hw_lock != NULL) {
				DRM_UNLOCK();
				free(map->handle, M_DRM);
				free(map, M_DRM);
				return DRM_ERR(EBUSY);
			}
			dev->lock.hw_lock = map->handle; /* Pointer to lock */
			DRM_UNLOCK();
		}
		break;
	case _DRM_AGP:
		map->offset += dev->agp->base;
		map->mtrr   = dev->agp->mtrr; /* for getmap */
		break;
	case _DRM_SCATTER_GATHER:
		if (!dev->sg) {
			free(map, M_DRM);
			return DRM_ERR(EINVAL);
		}
		map->offset = map->offset + dev->sg->handle;
		break;
	case _DRM_CONSISTENT:
		map->handle = drm_pci_alloc(dev, map->size, map->size,
		    0xfffffffful, &bus_addr);
		if (map->handle == NULL) {
			free(map, M_DRM);
			return ENOMEM;
		}
		map->offset = (unsigned long)bus_addr;
		break;
	default:
		free(map, M_DRM);
		return DRM_ERR(EINVAL);
	}

	DRM_LOCK();
	TAILQ_INSERT_TAIL(&dev->maplist, map, link);

done:
	/* Jumped to, with lock held, when a kernel map is found. */
	request.offset = map->offset;
	request.size = map->size;
	request.type = map->type;
	request.flags = map->flags;
	request.mtrr   = map->mtrr;
	request.handle = map->handle;
	DRM_UNLOCK();

	DRM_DEBUG("Added map %d 0x%lx/0x%lx\n", request.type, request.offset, request.size);

	if ( request.type != _DRM_SHM ) {
		request.handle = (void *)request.offset;
	}

	DRM_COPY_TO_USER_IOCTL( (drm_map_t *)data, request, sizeof(drm_map_t) );

	return 0;
}

void drm_remove_map(drm_device_t *dev, drm_local_map_t *map)
{
	DRM_SPINLOCK_ASSERT(&dev->dev_lock);

	TAILQ_REMOVE(&dev->maplist, map, link);

	switch (map->type) {
	case _DRM_REGISTERS:
		if (map->bsr == NULL)
			drm_ioremapfree(map);
		/* FALLTHROUGH */
	case _DRM_FRAME_BUFFER:
		if (map->mtrr) {
			int __unused retcode;

			retcode = drm_mtrr_del(map->offset, map->size,
			    DRM_MTRR_WC);
			DRM_DEBUG("mtrr_del = %d\n", retcode);
		}
		break;
	case _DRM_SHM:
		free(map->handle, M_DRM);
		break;
	case _DRM_AGP:
	case _DRM_SCATTER_GATHER:
		break;
	case _DRM_CONSISTENT:
		drm_pci_free(dev, map->size, map->handle, map->offset);
		break;
	}

	if (map->bsr != NULL) {
		bus_release_resource(dev->device, SYS_RES_MEMORY, map->rid,
		    map->bsr);
	}

	free(map, M_DRM);
}

/* Remove a map private from list and deallocate resources if the mapping
 * isn't in use.
 */

int drm_rmmap(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_local_map_t *map;
	drm_map_t request;

	DRM_COPY_FROM_USER_IOCTL( request, (drm_map_t *)data, sizeof(request) );

	DRM_LOCK();
	TAILQ_FOREACH(map, &dev->maplist, link) {
		if (map->handle == request.handle &&
		    map->flags & _DRM_REMOVABLE)
			break;
	}

	/* No match found. */
	if (map == NULL) {
		DRM_UNLOCK();
		return DRM_ERR(EINVAL);
	}

	drm_remove_map(dev, map);

	DRM_UNLOCK();

	return 0;
}


static void drm_cleanup_buf_error(drm_device_t *dev, drm_buf_entry_t *entry)
{
	int i;

	if (entry->seg_count) {
		for (i = 0; i < entry->seg_count; i++) {
			drm_pci_free(dev, entry->buf_size,
			    (void *)entry->seglist[i],
			    entry->seglist_bus[i]);
		}
		free(entry->seglist, M_DRM);
		free(entry->seglist_bus, M_DRM);

		entry->seg_count = 0;
	}

   	if (entry->buf_count) {
	   	for (i = 0; i < entry->buf_count; i++) {
			free(entry->buflist[i].dev_private, M_DRM);
		}
		free(entry->buflist, M_DRM);

		entry->buf_count = 0;
	}
}

static int drm_addbufs_agp(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;

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

	alignment  = (request->flags & _DRM_PAGE_ALIGN)
		? round_page(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: 0x%lx\n", agp_offset );
	DRM_DEBUG( "alignment:  %d\n",  alignment );
	DRM_DEBUG( "page_order: %d\n",  page_order );
	DRM_DEBUG( "total:      %d\n",  total );

	entry = &dma->bufs[order];

	entry->buflist = malloc(count * sizeof(*entry->buflist), M_DRM,
	    M_NOWAIT | M_ZERO);
	if ( !entry->buflist ) {
		return DRM_ERR(ENOMEM);
	}

	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->pending = 0;
		buf->filp    = NULL;

		buf->dev_priv_size = dev->dev_priv_size;
		buf->dev_private = malloc(buf->dev_priv_size, M_DRM,
		    M_NOWAIT | M_ZERO);
		if (buf->dev_private == NULL) {
			/* Set count correctly so we free the proper amount. */
			entry->buf_count = count;
			drm_cleanup_buf_error(dev, entry);
			return DRM_ERR(ENOMEM);
		}

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

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

	temp_buflist = realloc(dma->buflist,
	    (dma->buf_count + entry->buf_count) * sizeof(*dma->buflist), M_DRM,
	    M_NOWAIT);
	if (temp_buflist == NULL) {
		/* Free the entry because it isn't valid */
		drm_cleanup_buf_error(dev, entry);
		return DRM_ERR(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 );

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

	dma->flags = _DRM_DMA_USE_AGP;

	return 0;
}

static 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;
	vm_offset_t vaddr;
	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;
	dma_addr_t bus_addr;

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

	DRM_DEBUG( "count=%d, size=%d (%d), order=%d\n",
		   request->count, request->size, size, order );

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

	entry = &dma->bufs[order];

	entry->buflist = malloc(count * sizeof(*entry->buflist), M_DRM,
	    M_NOWAIT | M_ZERO);
	entry->seglist = malloc(count * sizeof(*entry->seglist), M_DRM,
	    M_NOWAIT | M_ZERO);
	entry->seglist_bus = malloc(count * sizeof(*entry->seglist_bus), M_DRM,
	    M_NOWAIT | M_ZERO);

	/* Keep the original pagelist until we know all the allocations
	 * have succeeded
	 */
	temp_pagelist = malloc((dma->page_count + (count << page_order)) *
	    sizeof(*dma->pagelist), M_DRM, M_NOWAIT);

	if (entry->buflist == NULL || entry->seglist == NULL ||
	    entry->seglist_bus == NULL || temp_pagelist == NULL) {
		free(entry->buflist, M_DRM);
		free(entry->seglist, M_DRM);
		free(entry->seglist_bus, M_DRM);
		return DRM_ERR(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 ) {
		vaddr = (vm_offset_t)drm_pci_alloc(dev, size, alignment,
		    0xfffffffful, &bus_addr);
		if (vaddr == 0) {
			/* Set count correctly so we free the proper amount. */
			entry->buf_count = count;
			entry->seg_count = count;
			drm_cleanup_buf_error(dev, entry);
			free(temp_pagelist, M_DRM);
			return DRM_ERR(ENOMEM);
		}

		entry->seglist_bus[entry->seg_count] = bus_addr;
		entry->seglist[entry->seg_count++] = vaddr;
		for ( i = 0 ; i < (1 << page_order) ; i++ ) {
			DRM_DEBUG( "page %d @ 0x%08lx\n",
				   dma->page_count + page_count,
				   (long)vaddr + PAGE_SIZE * i );
			temp_pagelist[dma->page_count + page_count++] =
			    vaddr + 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 *)(vaddr + offset);
			buf->bus_address = bus_addr + offset;
			buf->next    = NULL;
			buf->pending = 0;
			buf->filp    = NULL;

			buf->dev_priv_size = dev->dev_priv_size;
			buf->dev_private = malloc(buf->dev_priv_size, M_DRM,
			    M_NOWAIT | M_ZERO);
			if (buf->dev_private == NULL) {
				/* Set count correctly so we free the proper amount. */
				entry->buf_count = count;
				entry->seg_count = count;
				drm_cleanup_buf_error(dev, entry);
				free(temp_pagelist, M_DRM);
				return DRM_ERR(ENOMEM);
			}

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

	temp_buflist = realloc(dma->buflist,
	    (dma->buf_count + entry->buf_count) * sizeof(*dma->buflist), M_DRM,
	    M_NOWAIT);
	if (temp_buflist == NULL) {
		/* Free the entry because it isn't valid */
		drm_cleanup_buf_error(dev, entry);
		free(temp_pagelist, M_DRM);
		return DRM_ERR(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.
	 */
	free(dma->pagelist, M_DRM);
	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);

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

	return 0;

}

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;

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

	alignment  = (request->flags & _DRM_PAGE_ALIGN)
		? round_page(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: %ld\n", agp_offset );
	DRM_DEBUG( "alignment:  %d\n",  alignment );
	DRM_DEBUG( "page_order: %d\n",  page_order );
	DRM_DEBUG( "total:      %d\n",  total );

	entry = &dma->bufs[order];

	entry->buflist = malloc(count * sizeof(*entry->buflist), M_DRM,
	    M_NOWAIT | M_ZERO);
	if (entry->buflist == NULL)
		return DRM_ERR(ENOMEM);

	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 + dev->sg->handle);
		buf->next    = NULL;
		buf->pending = 0;
		buf->filp    = NULL;

		buf->dev_priv_size = dev->dev_priv_size;
		buf->dev_private = malloc(buf->dev_priv_size, M_DRM,
		    M_NOWAIT | M_ZERO);
		if (buf->dev_private == NULL) {
			/* Set count correctly so we free the proper amount. */
			entry->buf_count = count;
			drm_cleanup_buf_error(dev, entry);
			return DRM_ERR(ENOMEM);
		}

		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 = realloc(dma->buflist,
	    (dma->buf_count + entry->buf_count) * sizeof(*dma->buflist), M_DRM,
	    M_NOWAIT);
	if (temp_buflist == NULL) {
		/* Free the entry because it isn't valid */
		drm_cleanup_buf_error(dev, entry);
		return DRM_ERR(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 );

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

	dma->flags = _DRM_DMA_USE_SG;

	return 0;
}

int drm_addbufs(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_buf_desc_t request;
	int err;
	int order;

	DRM_COPY_FROM_USER_IOCTL( request, (drm_buf_desc_t *)data, sizeof(request) );

	if (request.count < 0 || request.count > 4096)
		return DRM_ERR(EINVAL);

	order = drm_order(request.size);
	if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
		return DRM_ERR(EINVAL);

	DRM_SPINLOCK(&dev->dma_lock);
	/* No more allocations after first buffer-using ioctl. */
	if (dev->buf_use != 0) {
		DRM_SPINUNLOCK(&dev->dma_lock);
		return DRM_ERR(EBUSY);
	}
	/* No more than one allocation per order */
	if (dev->dma->bufs[order].buf_count != 0) {
		DRM_SPINUNLOCK(&dev->dma_lock);
		return DRM_ERR(ENOMEM);
	}

	if ( request.flags & _DRM_AGP_BUFFER )
		err = drm_addbufs_agp(dev, &request);
	else
	if ( request.flags & _DRM_SG_BUFFER )
		err = drm_addbufs_sg(dev, &request);
	else
		err = drm_addbufs_pci(dev, &request);
	DRM_SPINUNLOCK(&dev->dma_lock);

	DRM_COPY_TO_USER_IOCTL((drm_buf_desc_t *)data, request, sizeof(request));

	return err;
}

int drm_infobufs(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_device_dma_t *dma = dev->dma;
	drm_buf_info_t request;
	int i;
	int count;
	int retcode = 0;

	DRM_COPY_FROM_USER_IOCTL( request, (drm_buf_info_t *)data, sizeof(request) );

	DRM_SPINLOCK(&dev->dma_lock);
	++dev->buf_use;		/* Can't allocate more after this call */
	DRM_SPINUNLOCK(&dev->dma_lock);

	for ( i = 0, count = 0 ; i < DRM_MAX_ORDER + 1 ; i++ ) {
		if ( dma->bufs[i].buf_count ) ++count;
	}

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

	if ( request.count >= count ) {
		for ( i = 0, count = 0 ; i < DRM_MAX_ORDER + 1 ; i++ ) {
			if ( dma->bufs[i].buf_count ) {
				drm_buf_desc_t from;

				from.count = dma->bufs[i].buf_count;
				from.size = dma->bufs[i].buf_size;
				from.low_mark = dma->bufs[i].freelist.low_mark;
				from.high_mark = dma->bufs[i].freelist.high_mark;

				if (DRM_COPY_TO_USER(&request.list[count], &from,
				    sizeof(drm_buf_desc_t)) != 0) {
					retcode = DRM_ERR(EFAULT);
					break;
				}

				DRM_DEBUG( "%d %d %d %d %d\n",
					   i,
					   dma->bufs[i].buf_count,
					   dma->bufs[i].buf_size,
					   dma->bufs[i].freelist.low_mark,
					   dma->bufs[i].freelist.high_mark );
				++count;
			}
		}
	}
	request.count = count;

	DRM_COPY_TO_USER_IOCTL( (drm_buf_info_t *)data, request, sizeof(request) );

	return retcode;
}

int drm_markbufs(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_device_dma_t *dma = dev->dma;
	drm_buf_desc_t request;
	int order;

	DRM_COPY_FROM_USER_IOCTL( request, (drm_buf_desc_t *)data, sizeof(request) );

	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 ||
	    request.low_mark < 0 || request.high_mark < 0) {
		return DRM_ERR(EINVAL);
	}

	DRM_SPINLOCK(&dev->dma_lock);
	if (request.low_mark > dma->bufs[order].buf_count ||
	    request.high_mark > dma->bufs[order].buf_count) {
		return DRM_ERR(EINVAL);
	}

	dma->bufs[order].freelist.low_mark  = request.low_mark;
	dma->bufs[order].freelist.high_mark = request.high_mark;
	DRM_SPINUNLOCK(&dev->dma_lock);

	return 0;
}

int drm_freebufs(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_device_dma_t *dma = dev->dma;
	drm_buf_free_t request;
	int i;
	int idx;
	drm_buf_t *buf;
	int retcode = 0;

	DRM_COPY_FROM_USER_IOCTL( request, (drm_buf_free_t *)data, sizeof(request) );

	DRM_DEBUG( "%d\n", request.count );

	DRM_SPINLOCK(&dev->dma_lock);
	for ( i = 0 ; i < request.count ; i++ ) {
		if (DRM_COPY_FROM_USER(&idx, &request.list[i], sizeof(idx))) {
			retcode = DRM_ERR(EFAULT);
			break;
		}
		if ( idx < 0 || idx >= dma->buf_count ) {
			DRM_ERROR( "Index %d (of %d max)\n",
				   idx, dma->buf_count - 1 );
			retcode = DRM_ERR(EINVAL);
			break;
		}
		buf = dma->buflist[idx];
		if ( buf->filp != filp ) {
			DRM_ERROR("Process %d freeing buffer not owned\n",
				   DRM_CURRENTPID);
			retcode = DRM_ERR(EINVAL);
			break;
		}
		drm_free_buffer(dev, buf);
	}
	DRM_SPINUNLOCK(&dev->dma_lock);

	return retcode;
}

int drm_mapbufs(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_device_dma_t *dma = dev->dma;
	int retcode = 0;
	const int zero = 0;
	vm_offset_t address;
	struct vmspace *vms;
#ifdef __FreeBSD__
	vm_ooffset_t foff;
	vm_size_t size;
	vm_offset_t vaddr;
#elif defined(__NetBSD__) || defined(__OpenBSD__)
	struct vnode *vn;
	vm_size_t size;
	vaddr_t vaddr;
#endif /* __NetBSD__ || __OpenBSD__ */

	drm_buf_map_t request;
	int i;

	DRM_COPY_FROM_USER_IOCTL( request, (drm_buf_map_t *)data, sizeof(request) );

#if defined(__NetBSD__) || defined(__OpenBSD__)
	if (!vfinddev(kdev, VCHR, &vn))
		return 0;	/* FIXME: Shouldn't this be EINVAL or something? */
#endif /* __NetBSD__ || __OpenBSD */

#if defined(__FreeBSD__) && __FreeBSD_version >= 500000
	vms = p->td_proc->p_vmspace;
#else
	vms = p->p_vmspace;
#endif

	DRM_SPINLOCK(&dev->dma_lock);
	dev->buf_use++;		/* Can't allocate more after this call */
	DRM_SPINUNLOCK(&dev->dma_lock);

	if (request.count < dma->buf_count)
		goto done;

	if ((dev->use_agp && (dma->flags & _DRM_DMA_USE_AGP)) ||
	    (dev->use_sg && (dma->flags & _DRM_DMA_USE_SG))) {
		drm_local_map_t *map = dev->agp_buffer_map;

		if (map == NULL) {
			retcode = EINVAL;
			goto done;
		}
		size = round_page(map->size);
		foff = map->offset;
	} else {
		size = round_page(dma->byte_count),
		foff = 0;
	}

#ifdef __FreeBSD__
	vaddr = round_page((vm_offset_t)vms->vm_daddr + MAXDSIZ);
#if __FreeBSD_version >= 600023
	retcode = vm_mmap(&vms->vm_map, &vaddr, size, PROT_READ | PROT_WRITE,
	    VM_PROT_ALL, MAP_SHARED, OBJT_DEVICE, kdev, foff );
#else
	retcode = vm_mmap(&vms->vm_map, &vaddr, size, PROT_READ | PROT_WRITE,
	    VM_PROT_ALL, MAP_SHARED, SLIST_FIRST(&kdev->si_hlist), foff );
#endif
#elif defined(__NetBSD__) || defined(__OpenBSD__)
	vaddr = round_page((vaddr_t)vms->vm_daddr + MAXDSIZ);
	retcode = uvm_mmap(&vms->vm_map, &vaddr, size,
	    UVM_PROT_READ | UVM_PROT_WRITE, UVM_PROT_ALL, MAP_SHARED,
	    &vn->v_uobj, foff, p->p_rlimit[RLIMIT_MEMLOCK].rlim_cur);
#endif /* __NetBSD__ || __OpenBSD */
	if (retcode)
		goto done;

	request.virtual = (void *)vaddr;

	for ( i = 0 ; i < dma->buf_count ; i++ ) {
		if (DRM_COPY_TO_USER(&request.list[i].idx,
		    &dma->buflist[i]->idx, sizeof(request.list[0].idx))) {
			retcode = EFAULT;
			goto done;
		}
		if (DRM_COPY_TO_USER(&request.list[i].total,
		    &dma->buflist[i]->total, sizeof(request.list[0].total))) {
			retcode = EFAULT;
			goto done;
		}
		if (DRM_COPY_TO_USER(&request.list[i].used, &zero,
		    sizeof(zero))) {
			retcode = EFAULT;
			goto done;
		}
		address = vaddr + dma->buflist[i]->offset; /* *** */
		if (DRM_COPY_TO_USER(&request.list[i].address, &address,
		    sizeof(address))) {
			retcode = EFAULT;
			goto done;
		}
	}

 done:
	request.count = dma->buf_count;

	DRM_DEBUG( "%d buffers, retcode = %d\n", request.count, retcode );

	DRM_COPY_TO_USER_IOCTL((drm_buf_map_t *)data, request, sizeof(request));

	return DRM_ERR(retcode);
}