path: root/linux-core/radeon_gem.c

/*
 * Copyright 2008 Red Hat Inc.
 *
 * 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 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
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
 *
 * Author: Dave Airlie
 */
#include "drmP.h"
#include "drm.h"

#include "radeon_drm.h"
#include "radeon_drv.h"

static int radeon_gem_ib_init(struct drm_device *dev);
static int radeon_gem_ib_destroy(struct drm_device *dev);
static int radeon_gem_dma_bufs_init(struct drm_device *dev);
static void radeon_gem_dma_bufs_destroy(struct drm_device *dev);

int radeon_gem_init_object(struct drm_gem_object *obj)
{
	struct drm_radeon_gem_object *obj_priv;

	obj_priv = drm_calloc(1, sizeof(*obj_priv), DRM_MEM_DRIVER);
	if (!obj_priv) {
		return -ENOMEM;
	}

	obj->driver_private = obj_priv;
	obj_priv->obj = obj;
	return 0;
}

void radeon_gem_free_object(struct drm_gem_object *obj)
{

	struct drm_radeon_gem_object *obj_priv = obj->driver_private;

	/* tear down the buffer object - gem holds struct mutex */
	drm_bo_takedown_vm_locked(obj_priv->bo);
	drm_bo_usage_deref_locked(&obj_priv->bo);
	drm_free(obj->driver_private, 1, DRM_MEM_DRIVER);
}

int radeon_gem_info_ioctl(struct drm_device *dev, void *data,
			  struct drm_file *file_priv)
{
	struct drm_radeon_private *dev_priv = dev->dev_private;
	struct drm_radeon_gem_info *args = data;

	args->vram_start = dev_priv->mm.vram_offset;
	args->vram_size = dev_priv->mm.vram_size;
	args->vram_visible = dev_priv->mm.vram_visible;

	args->gart_start = dev_priv->mm.gart_start;
	args->gart_size = dev_priv->mm.gart_size;

	return 0;
}

struct drm_gem_object *radeon_gem_object_alloc(struct drm_device *dev, int size, int alignment,
					       int initial_domain, bool discardable)
{
	struct drm_gem_object *obj;
	struct drm_radeon_gem_object *obj_priv;
	int ret;
	uint32_t flags;
	uint32_t page_align;

	obj = drm_gem_object_alloc(dev, size);
	if (!obj)
		return NULL;

	obj_priv = obj->driver_private;
	flags = DRM_BO_FLAG_MAPPABLE;
	if (initial_domain == RADEON_GEM_DOMAIN_VRAM)
		flags |= DRM_BO_FLAG_MEM_VRAM;
	else if (initial_domain == RADEON_GEM_DOMAIN_GTT)
		flags |= DRM_BO_FLAG_MEM_TT;
	else
		flags |= DRM_BO_FLAG_MEM_LOCAL | DRM_BO_FLAG_CACHED;

	flags |= DRM_BO_FLAG_READ | DRM_BO_FLAG_WRITE | DRM_BO_FLAG_EXE;

	if (discardable)
		flags |= DRM_BO_FLAG_DISCARDABLE;

	if (alignment == 0)
		alignment = PAGE_SIZE;

	page_align = alignment >> PAGE_SHIFT;
	/* create a TTM BO */
	ret = drm_buffer_object_create(dev,
				       size, drm_bo_type_device,
				       flags, 0, page_align,
				       0, &obj_priv->bo);
	if (ret)
		goto fail;

	DRM_DEBUG("%p : size 0x%x, alignment %d, initial_domain %d\n", obj_priv->bo, size, alignment, initial_domain);
	return obj;
fail:

	return NULL;
}

int radeon_gem_create_ioctl(struct drm_device *dev, void *data,
			    struct drm_file *file_priv)
{
	struct drm_radeon_gem_create *args = data;
	struct drm_radeon_gem_object *obj_priv;
	struct drm_gem_object *obj;
	int ret = 0;
	int handle;

	/* create a gem object to contain this object in */
	args->size = roundup(args->size, PAGE_SIZE);

	obj = radeon_gem_object_alloc(dev, args->size, args->alignment, args->initial_domain, args->no_backing_store);
	if (!obj)
		return -EINVAL;

	obj_priv = obj->driver_private;
	DRM_DEBUG("obj is %p bo is %p, %d\n", obj, obj_priv->bo, obj_priv->bo->num_pages);
	ret = drm_gem_handle_create(file_priv, obj, &handle);
	mutex_lock(&dev->struct_mutex);
	drm_gem_object_handle_unreference(obj);
	mutex_unlock(&dev->struct_mutex);

	if (ret)
		goto fail;

	args->handle = handle;

	return 0;
fail:
	drm_gem_object_unreference(obj);

	return ret;
}

int radeon_gem_set_domain(struct drm_gem_object *obj, uint32_t read_domains, uint32_t write_domain, uint32_t *flags_p, bool unfenced)
{
	struct drm_radeon_gem_object *obj_priv;
	uint32_t flags = 0;
	int ret;

	obj_priv = obj->driver_private;

	/* work out where to validate the buffer to */
	if (write_domain) { /* write domains always win */
		if (write_domain == RADEON_GEM_DOMAIN_VRAM)
			flags = DRM_BO_FLAG_MEM_VRAM;
		else if (write_domain == RADEON_GEM_DOMAIN_GTT)
			flags = DRM_BO_FLAG_MEM_TT; // need a can write gart check
		else
			return -EINVAL; // we can't write to system RAM
	} else {
		/* okay for a read domain - prefer wherever the object is now or close enough */
		if (read_domains == 0)
			return -EINVAL;

		/* if its already a local memory and CPU is valid do nothing */
		if (read_domains & RADEON_GEM_DOMAIN_CPU) {
			if (obj_priv->bo->mem.mem_type == DRM_BO_MEM_LOCAL)
				return 0;
			if (read_domains == RADEON_GEM_DOMAIN_CPU)
				return -EINVAL;
		}
		
		/* simple case no choice in domains */
		if (read_domains == RADEON_GEM_DOMAIN_VRAM)
			flags = DRM_BO_FLAG_MEM_VRAM;
		else if (read_domains == RADEON_GEM_DOMAIN_GTT)
			flags = DRM_BO_FLAG_MEM_TT;
		else if ((obj_priv->bo->mem.mem_type == DRM_BO_MEM_VRAM) && (read_domains & RADEON_GEM_DOMAIN_VRAM))
			flags = DRM_BO_FLAG_MEM_VRAM;
		else if ((obj_priv->bo->mem.mem_type == DRM_BO_MEM_TT) && (read_domains & RADEON_GEM_DOMAIN_GTT))
			flags = DRM_BO_FLAG_MEM_TT;
		else if ((obj_priv->bo->mem.mem_type == DRM_BO_MEM_LOCAL) && (read_domains & RADEON_GEM_DOMAIN_GTT))
			flags = DRM_BO_FLAG_MEM_TT;

		/* no idea here just set whatever we are input */
		if (flags == 0) {
			if (read_domains & RADEON_GEM_DOMAIN_VRAM)
				flags |= DRM_BO_FLAG_MEM_VRAM;
			if (read_domains & RADEON_GEM_DOMAIN_GTT)
				flags |= DRM_BO_FLAG_MEM_TT;
		}
	}

	/* if this BO is pinned then we ain't moving it anywhere */
	if (obj_priv->bo->pinned_mem_type && unfenced) 
		return 0;

	DRM_DEBUG("validating %p from %d into %x %d %d\n", obj_priv->bo, obj_priv->bo->mem.mem_type, flags, read_domains, write_domain);
	ret = drm_bo_do_validate(obj_priv->bo, flags, DRM_BO_MASK_MEM | DRM_BO_FLAG_CACHED,
				 unfenced ? DRM_BO_HINT_DONT_FENCE : 0, 0);
	if (ret)
		return ret;

	if (flags_p)
		*flags_p = flags;
	return 0;
    
}

int radeon_gem_set_domain_ioctl(struct drm_device *dev, void *data,
				struct drm_file *file_priv)
{
	/* transition the BO to a domain - just validate the BO into a certain domain */
	struct drm_radeon_gem_set_domain *args = data;
	struct drm_gem_object *obj;
	struct drm_radeon_gem_object *obj_priv;
	int ret;

	/* for now if someone requests domain CPU - just make sure the buffer is finished with */

	/* just do a BO wait for now */
	obj = drm_gem_object_lookup(dev, file_priv, args->handle);
	if (obj == NULL)
		return -EINVAL;

	obj_priv = obj->driver_private;

	ret = radeon_gem_set_domain(obj, args->read_domains, args->write_domain, NULL, true);

	mutex_lock(&dev->struct_mutex);
	drm_gem_object_unreference(obj);
	mutex_unlock(&dev->struct_mutex);
	return ret;
}

int radeon_gem_pread_ioctl(struct drm_device *dev, void *data,
			  struct drm_file *file_priv)
{
	return -ENOSYS;
}

int radeon_gem_pwrite_ioctl(struct drm_device *dev, void *data,
			  struct drm_file *file_priv)
{
	struct drm_radeon_gem_pwrite *args = data;
	struct drm_gem_object *obj;
	struct drm_radeon_gem_object *obj_priv;
	int ret;

	obj = drm_gem_object_lookup(dev, file_priv, args->handle);
	if (obj == NULL)
		return -EINVAL;

	obj_priv = obj->driver_private;
	
	/* check where the buffer is first - if not in VRAM
	   fallback to userspace copying for now */
	mutex_lock(&obj_priv->bo->mutex);
	if (obj_priv->bo->mem.mem_type != DRM_BO_MEM_VRAM) {
		ret = -EINVAL;
		goto out_unlock;
	}

	DRM_ERROR("pwriting data->size %lld %llx\n", args->size, args->offset);
	ret = -EINVAL;

#if 0
	/* so need to grab an IB, copy the data into it in a loop
	   and send them to VRAM using HDB */
	while ((buf = radeon_host_data_blit(dev, cpp, w, dst_pitch_off, &buf_pitch,
					    x, &y, (unsigned int*)&h, &hpass)) != 0) {
		radeon_host_data_blit_copy_pass(dev, cpp, buf, (uint8_t *)src,
						hpass, buf_pitch, src_pitch);
		src += hpass * src_pitch;
	}
#endif
out_unlock:
	mutex_unlock(&obj_priv->bo->mutex);
	mutex_lock(&dev->struct_mutex);
	drm_gem_object_unreference(obj);
	mutex_unlock(&dev->struct_mutex);
	return ret;
}

int radeon_gem_mmap_ioctl(struct drm_device *dev, void *data,
			  struct drm_file *file_priv)
{
	struct drm_radeon_gem_mmap *args = data;
	struct drm_gem_object *obj;
	struct drm_radeon_gem_object *obj_priv;
	loff_t offset;
	unsigned long addr;

	obj = drm_gem_object_lookup(dev, file_priv, args->handle);
	if (obj == NULL)
		return -EINVAL;

	offset = args->offset;

	DRM_DEBUG("got here %p\n", obj);
	obj_priv = obj->driver_private;

	DRM_DEBUG("got here %p %p %lld %ld\n", obj, obj_priv->bo, args->size, obj_priv->bo->num_pages);
	if (!obj_priv->bo) {
		mutex_lock(&dev->struct_mutex);
		drm_gem_object_unreference(obj);
		mutex_unlock(&dev->struct_mutex);
		return -EINVAL;
	}

	down_write(&current->mm->mmap_sem);
	addr = do_mmap_pgoff(file_priv->filp, 0, args->size,
			     PROT_READ | PROT_WRITE, MAP_SHARED,
			     obj_priv->bo->map_list.hash.key);
	up_write(&current->mm->mmap_sem);

	DRM_DEBUG("got here %p %d\n", obj, obj_priv->bo->mem.mem_type);
	mutex_lock(&dev->struct_mutex);
	drm_gem_object_unreference(obj);
	mutex_unlock(&dev->struct_mutex);
	if (IS_ERR((void *)addr))
		return addr;

	args->addr_ptr = (uint64_t) addr;

	return 0;

}

int radeon_gem_pin_ioctl(struct drm_device *dev, void *data,
			 struct drm_file *file_priv)
{
	struct drm_radeon_gem_pin *args = data;
	struct drm_gem_object *obj;
	struct drm_radeon_gem_object *obj_priv;
	int ret;
	int flags = DRM_BO_FLAG_NO_EVICT;
	int mask = DRM_BO_FLAG_NO_EVICT;

	/* check for valid args */
	if (args->pin_domain) {
		mask |= DRM_BO_MASK_MEM;
		if (args->pin_domain == RADEON_GEM_DOMAIN_GTT)
			flags |= DRM_BO_FLAG_MEM_TT;
		else if (args->pin_domain == RADEON_GEM_DOMAIN_VRAM)
			flags |= DRM_BO_FLAG_MEM_VRAM;
		else /* hand back the offset we currently have if no args supplied
		      - this is to allow old mesa to work - its a hack */
			flags = 0;
	}

	obj = drm_gem_object_lookup(dev, file_priv, args->handle);
	if (obj == NULL)
		return -EINVAL;

	obj_priv = obj->driver_private;

	/* validate into a pin with no fence */
	DRM_DEBUG("got here %p %p %d\n", obj, obj_priv->bo, atomic_read(&obj_priv->bo->usage));
	if (flags && !(obj_priv->bo->type != drm_bo_type_kernel && !DRM_SUSER(DRM_CURPROC))) {
		ret = drm_bo_do_validate(obj_priv->bo, flags, mask,
					 DRM_BO_HINT_DONT_FENCE, 0);
	} else
		ret = 0;

	args->offset = obj_priv->bo->offset;
	DRM_DEBUG("got here %p %p %x\n", obj, obj_priv->bo, obj_priv->bo->offset);

	mutex_lock(&dev->struct_mutex);
	drm_gem_object_unreference(obj);
	mutex_unlock(&dev->struct_mutex);
	return ret;
}

int radeon_gem_unpin_ioctl(struct drm_device *dev, void *data,
			   struct drm_file *file_priv)
{
	struct drm_radeon_gem_unpin *args = data;
	struct drm_gem_object *obj;
	struct drm_radeon_gem_object *obj_priv;
	int ret;

	obj = drm_gem_object_lookup(dev, file_priv, args->handle);
	if (obj == NULL)
		return -EINVAL;

	obj_priv = obj->driver_private;

	/* validate into a pin with no fence */

	ret = drm_bo_do_validate(obj_priv->bo, 0, DRM_BO_FLAG_NO_EVICT,
				 DRM_BO_HINT_DONT_FENCE, 0);

	mutex_lock(&dev->struct_mutex);
	drm_gem_object_unreference(obj);
	mutex_unlock(&dev->struct_mutex);
	return ret;
}

int radeon_gem_busy(struct drm_device *dev, void *data,
		     struct drm_file *file_priv)
{
	return 0;
}

int radeon_gem_wait_rendering(struct drm_device *dev, void *data,
			      struct drm_file *file_priv)
{
	struct drm_radeon_gem_wait_rendering *args = data;
	struct drm_gem_object *obj;
	struct drm_radeon_gem_object *obj_priv;
	int ret;


	obj = drm_gem_object_lookup(dev, file_priv, args->handle);
	if (obj == NULL)
		return -EINVAL;

	obj_priv = obj->driver_private;

	mutex_lock(&obj_priv->bo->mutex);
	ret = drm_bo_wait(obj_priv->bo, 0, 1, 1, 0);
	mutex_unlock(&obj_priv->bo->mutex);
	
	mutex_lock(&dev->struct_mutex);
	drm_gem_object_unreference(obj);
	mutex_unlock(&dev->struct_mutex);
	return ret;
}



/*
 * Depending on card genertation, chipset bugs, etc... the amount of vram
 * accessible to the CPU can vary. This function is our best shot at figuring
 * it out. Returns a value in KB.
 */
static uint32_t radeon_get_accessible_vram(struct drm_device *dev)
{
	drm_radeon_private_t *dev_priv = dev->dev_private;
	uint32_t aper_size;
	u8 byte;

	if (dev_priv->chip_family >= CHIP_R600)
		aper_size = RADEON_READ(R600_CONFIG_APER_SIZE) / 1024;
	else
		aper_size = RADEON_READ(RADEON_CONFIG_APER_SIZE) / 1024;

	/* Set HDP_APER_CNTL only on cards that are known not to be broken,
	 * that is has the 2nd generation multifunction PCI interface
	 */
	if (dev_priv->chip_family == CHIP_RV280 ||
	    dev_priv->chip_family == CHIP_RV350 ||
	    dev_priv->chip_family == CHIP_RV380 ||
	    dev_priv->chip_family == CHIP_R420 ||
	    dev_priv->chip_family == CHIP_R423 ||
	    dev_priv->chip_family == CHIP_RV410 ||
	    radeon_is_avivo(dev_priv)) {
		uint32_t temp = RADEON_READ(RADEON_HOST_PATH_CNTL);
		temp |= RADEON_HDP_APER_CNTL;
		RADEON_WRITE(RADEON_HOST_PATH_CNTL, temp);
		return aper_size * 2;
	}
	
	/* Older cards have all sorts of funny issues to deal with. First
	 * check if it's a multifunction card by reading the PCI config
	 * header type... Limit those to one aperture size
	 */
	pci_read_config_byte(dev->pdev, 0xe, &byte);
	if (byte & 0x80)
		return aper_size;
	
	/* Single function older card. We read HDP_APER_CNTL to see how the BIOS
	 * have set it up. We don't write this as it's broken on some ASICs but
	 * we expect the BIOS to have done the right thing (might be too optimistic...)
	 */
	if (RADEON_READ(RADEON_HOST_PATH_CNTL) & RADEON_HDP_APER_CNTL)
		return aper_size * 2;

	return aper_size;
}	

/* code from the DDX - do memory sizing */
void radeon_vram_setup(struct drm_device *dev)
{
	drm_radeon_private_t *dev_priv = dev->dev_private;
	uint32_t vram;
	uint32_t accessible,  bar_size;

	if (!radeon_is_avivo(dev_priv) && (dev_priv->flags & RADEON_IS_IGP)) {
		uint32_t tom = RADEON_READ(RADEON_NB_TOM);

		vram = (((tom >> 16) - (tom & 0xffff) + 1) << 6);
		RADEON_WRITE(RADEON_CONFIG_MEMSIZE, vram * 1024);
	} else {
		if (dev_priv->chip_family >= CHIP_R600)
			vram = RADEON_READ(R600_CONFIG_MEMSIZE) / 1024;
		else {
			vram = RADEON_READ(RADEON_CONFIG_MEMSIZE) / 1024;

			/* Some production boards of m6 will return 0 if it's 8 MB */
			if (vram == 0) {
				vram = 8192;
				RADEON_WRITE(RADEON_CONFIG_MEMSIZE, 0x800000);
			}
		}
	}

	accessible = radeon_get_accessible_vram(dev);

	bar_size = drm_get_resource_len(dev, 0) / 1024;
	if (bar_size == 0)
		bar_size = 0x20000;
	if (accessible > bar_size)
		accessible = bar_size;

	if (accessible > vram)
		accessible = vram;

	DRM_INFO("Detected VRAM RAM=%dK, accessible=%uK, BAR=%uK\n",
		 vram, accessible, bar_size);

	dev_priv->mm.vram_offset = dev_priv->fb_aper_offset;
	dev_priv->mm.vram_size = vram * 1024;
	dev_priv->mm.vram_visible = accessible * 1024;


}

static int radeon_gart_init(struct drm_device *dev)
{
	drm_radeon_private_t *dev_priv = dev->dev_private;
	int ret;
	u32 base = 0;

	/* setup a 32MB GART */
	dev_priv->gart_size = dev_priv->mm.gart_size;

	dev_priv->gart_info.table_size = RADEON_PCIGART_TABLE_SIZE;

#if __OS_HAS_AGP
	/* setup VRAM vs GART here */
	if (dev_priv->flags & RADEON_IS_AGP) {
		base = dev->agp->base;
		if ((base + dev_priv->gart_size - 1) >= dev_priv->fb_location &&
		    base < (dev_priv->fb_location + dev_priv->fb_size - 1)) {
			DRM_INFO("Can't use agp base @0x%08lx, won't fit\n",
				 dev->agp->base);
			base = 0;
		}
	}
#endif

	if (base == 0) {
		base = dev_priv->fb_location + dev_priv->fb_size;
		if (base < dev_priv->fb_location ||
		    ((base + dev_priv->gart_size) & 0xfffffffful) < base)
			base = dev_priv->fb_location
				- dev_priv->gart_size;
	}
	/* start on the card */
	dev_priv->gart_vm_start = base & 0xffc00000u;
	if (dev_priv->gart_vm_start != base)
		DRM_INFO("GART aligned down from 0x%08x to 0x%08x\n",
			 base, dev_priv->gart_vm_start);

	/* if on PCIE we need to allocate an fb object for the PCIE GART table */
	if (dev_priv->flags & RADEON_IS_PCIE) {
		ret = drm_buffer_object_create(dev, RADEON_PCIGART_TABLE_SIZE,
					       drm_bo_type_kernel,
					       DRM_BO_FLAG_READ | DRM_BO_FLAG_MEM_VRAM | DRM_BO_FLAG_MAPPABLE | DRM_BO_FLAG_NO_EVICT,
					       0, 1, 0, &dev_priv->mm.pcie_table.bo);
		if (ret)
			return -EINVAL;

		dev_priv->mm.pcie_table_backup = kzalloc(RADEON_PCIGART_TABLE_SIZE, GFP_KERNEL);
		if (!dev_priv->mm.pcie_table_backup)
			return -EINVAL;

		ret = drm_bo_kmap(dev_priv->mm.pcie_table.bo, 0, RADEON_PCIGART_TABLE_SIZE >> PAGE_SHIFT,
				  &dev_priv->mm.pcie_table.kmap);
		if (ret)
			return -EINVAL;

		dev_priv->pcigart_offset_set = 2;
		dev_priv->gart_info.bus_addr =  dev_priv->fb_location + dev_priv->mm.pcie_table.bo->offset;
		dev_priv->gart_info.addr = dev_priv->mm.pcie_table.kmap.virtual;
		dev_priv->gart_info.gart_reg_if = DRM_ATI_GART_PCIE;
		dev_priv->gart_info.gart_table_location = DRM_ATI_GART_FB;
		memset(dev_priv->gart_info.addr, 0, RADEON_PCIGART_TABLE_SIZE);
	} else if (!(dev_priv->flags & RADEON_IS_AGP)) {
		/* allocate PCI GART table */
		dev_priv->gart_info.table_mask = DMA_BIT_MASK(32);
		dev_priv->gart_info.gart_table_location = DRM_ATI_GART_MAIN;
		if (dev_priv->flags & RADEON_IS_IGPGART)
			dev_priv->gart_info.gart_reg_if = DRM_ATI_GART_IGP;
		else
			dev_priv->gart_info.gart_reg_if = DRM_ATI_GART_PCI;

		ret = drm_ati_alloc_pcigart_table(dev, &dev_priv->gart_info);
		if (ret) {
			DRM_ERROR("cannot allocate PCI GART page!\n");
			return -EINVAL;
		}

		dev_priv->gart_info.addr = dev_priv->gart_info.table_handle->vaddr;
		dev_priv->gart_info.bus_addr = dev_priv->gart_info.table_handle->busaddr;
	}
	
	/* gart values setup - start the GART */
	if (dev_priv->flags & RADEON_IS_AGP) {
		radeon_set_pcigart(dev_priv, 0);
	} else {
		radeon_set_pcigart(dev_priv, 1);
	}
		
	return 0;
}

int radeon_alloc_gart_objects(struct drm_device *dev)
{
	drm_radeon_private_t *dev_priv = dev->dev_private;
	int ret;

	ret = drm_buffer_object_create(dev, RADEON_DEFAULT_RING_SIZE,
				       drm_bo_type_kernel,
				       DRM_BO_FLAG_READ | DRM_BO_FLAG_MEM_TT |
				       DRM_BO_FLAG_MAPPABLE | DRM_BO_FLAG_NO_EVICT,
				       0, 1, 0, &dev_priv->mm.ring.bo);
	if (ret) {
		if (dev_priv->flags & RADEON_IS_AGP)
			DRM_ERROR("failed to allocate ring - most likely an AGP driver bug\n");
		else
			DRM_ERROR("failed to allocate ring\n");
		return -EINVAL;
	}

	ret = drm_bo_kmap(dev_priv->mm.ring.bo, 0, RADEON_DEFAULT_RING_SIZE >> PAGE_SHIFT,
			  &dev_priv->mm.ring.kmap);
	if (ret) {
		DRM_ERROR("failed to map ring\n");
		return -EINVAL;
	}

	ret = drm_buffer_object_create(dev, PAGE_SIZE,
				       drm_bo_type_kernel,
				       DRM_BO_FLAG_WRITE |DRM_BO_FLAG_READ | DRM_BO_FLAG_MEM_TT |
				       DRM_BO_FLAG_MAPPABLE | DRM_BO_FLAG_NO_EVICT,
				       0, 1, 0, &dev_priv->mm.ring_read.bo);
	if (ret) {
		DRM_ERROR("failed to allocate ring read\n");
		return -EINVAL;
	}

	ret = drm_bo_kmap(dev_priv->mm.ring_read.bo, 0,
			  PAGE_SIZE >> PAGE_SHIFT,
			  &dev_priv->mm.ring_read.kmap);
	if (ret) {
		DRM_ERROR("failed to map ring read\n");
		return -EINVAL;
	}

	DRM_DEBUG("Ring ptr %p mapped at %ld %p, read ptr %p maped at %ld %p\n",
		  dev_priv->mm.ring.bo, dev_priv->mm.ring.bo->offset, dev_priv->mm.ring.kmap.virtual,
		  dev_priv->mm.ring_read.bo, dev_priv->mm.ring_read.bo->offset, dev_priv->mm.ring_read.kmap.virtual);

	/* init the indirect buffers */
	radeon_gem_ib_init(dev);
	radeon_gem_dma_bufs_init(dev);
	return 0;			  

}

static bool avivo_get_mc_idle(struct drm_device *dev)
{
	drm_radeon_private_t *dev_priv = dev->dev_private;

	if (dev_priv->chip_family >= CHIP_R600) {
		/* no idea where this is on r600 yet */
		return true;
	} else if (dev_priv->chip_family == CHIP_RV515) {
		if (radeon_read_mc_reg(dev_priv, RV515_MC_STATUS) & RV515_MC_STATUS_IDLE)
			return true;
		else
			return false;
	} else if (dev_priv->chip_family == CHIP_RS600) {
		if (radeon_read_mc_reg(dev_priv, RS600_MC_STATUS) & RS600_MC_STATUS_IDLE)
			return true;
		else
			return false;
	} else if ((dev_priv->chip_family == CHIP_RS690) ||
		   (dev_priv->chip_family == CHIP_RS740)) {
		if (radeon_read_mc_reg(dev_priv, RS690_MC_STATUS) & RS690_MC_STATUS_IDLE)
			return true;
		else
			return false;
	} else {
		if (radeon_read_mc_reg(dev_priv, R520_MC_STATUS) & R520_MC_STATUS_IDLE)
			return true;
		else
			return false;
	}
}


static void avivo_disable_mc_clients(struct drm_device *dev)
{
	drm_radeon_private_t *dev_priv = dev->dev_private;
	uint32_t tmp;
	int timeout;

	radeon_do_wait_for_idle(dev_priv);

	RADEON_WRITE(AVIVO_D1VGA_CONTROL, RADEON_READ(AVIVO_D1VGA_CONTROL) & ~AVIVO_DVGA_CONTROL_MODE_ENABLE);
	RADEON_WRITE(AVIVO_D2VGA_CONTROL, RADEON_READ(AVIVO_D2VGA_CONTROL) & ~AVIVO_DVGA_CONTROL_MODE_ENABLE);

	tmp = RADEON_READ(AVIVO_D1CRTC_CONTROL);	
	RADEON_WRITE(AVIVO_D1CRTC_CONTROL, tmp & ~AVIVO_CRTC_EN);

	tmp = RADEON_READ(AVIVO_D2CRTC_CONTROL);	
	RADEON_WRITE(AVIVO_D2CRTC_CONTROL, tmp & ~AVIVO_CRTC_EN);

	tmp = RADEON_READ(AVIVO_D2CRTC_CONTROL);

	udelay(1000);

	timeout = 0;
	while (!(avivo_get_mc_idle(dev))) {
		if (++timeout > 100000) {
			DRM_ERROR("Timeout waiting for memory controller to update settings\n");
			DRM_ERROR("Bad things may or may not happen\n");
		}
		udelay(10);
	}
}

static inline u32 radeon_busy_wait(struct drm_device *dev, uint32_t reg, uint32_t bits,
				  unsigned int timeout)
{
	drm_radeon_private_t *dev_priv = dev->dev_private;
	u32 status;

	do {
		udelay(10);
		status = RADEON_READ(reg);
		timeout--;
	} while(status != 0xffffffff && (status & bits) && (timeout > 0));

	if (timeout == 0)
		status = 0xffffffff;
	     
	return status;
}

/* Wait for vertical sync on primary CRTC */
static void radeon_wait_for_vsync(struct drm_device *dev)
{
	drm_radeon_private_t *dev_priv = dev->dev_private;
	uint32_t       crtc_gen_cntl;

	crtc_gen_cntl = RADEON_READ(RADEON_CRTC_GEN_CNTL);
	if ((crtc_gen_cntl & RADEON_CRTC_DISP_REQ_EN_B) ||
	    !(crtc_gen_cntl & RADEON_CRTC_EN))
		return;

	/* Clear the CRTC_VBLANK_SAVE bit */
	RADEON_WRITE(RADEON_CRTC_STATUS, RADEON_CRTC_VBLANK_SAVE_CLEAR);

	radeon_busy_wait(dev, RADEON_CRTC_STATUS, RADEON_CRTC_VBLANK_SAVE, 2000);

}

/* Wait for vertical sync on primary CRTC */
static void radeon_wait_for_vsync2(struct drm_device *dev)
{
	drm_radeon_private_t *dev_priv = dev->dev_private;
	uint32_t       crtc2_gen_cntl;

	crtc2_gen_cntl = RADEON_READ(RADEON_CRTC2_GEN_CNTL);
	if ((crtc2_gen_cntl & RADEON_CRTC2_DISP_REQ_EN_B) ||
	    !(crtc2_gen_cntl & RADEON_CRTC2_EN))
		return;

	/* Clear the CRTC_VBLANK_SAVE bit */
	RADEON_WRITE(RADEON_CRTC2_STATUS, RADEON_CRTC2_VBLANK_SAVE_CLEAR);

	radeon_busy_wait(dev, RADEON_CRTC2_STATUS, RADEON_CRTC2_VBLANK_SAVE, 2000);
}

static void legacy_disable_mc_clients(struct drm_device *dev)
{
	drm_radeon_private_t *dev_priv = dev->dev_private;
	uint32_t old_mc_status, status_idle;
	uint32_t ov0_scale_cntl, crtc_ext_cntl, crtc_gen_cntl, crtc2_gen_cntl;
	uint32_t status;

	radeon_do_wait_for_idle(dev_priv);

	if (dev_priv->flags & RADEON_IS_IGP)
		return;

	old_mc_status = RADEON_READ(RADEON_MC_STATUS);

	/* stop display and memory access */
	ov0_scale_cntl = RADEON_READ(RADEON_OV0_SCALE_CNTL);
	RADEON_WRITE(RADEON_OV0_SCALE_CNTL, ov0_scale_cntl & ~RADEON_SCALER_ENABLE);
	crtc_ext_cntl = RADEON_READ(RADEON_CRTC_EXT_CNTL);
	RADEON_WRITE(RADEON_CRTC_EXT_CNTL, crtc_ext_cntl | RADEON_CRTC_DISPLAY_DIS);
	crtc_gen_cntl = RADEON_READ(RADEON_CRTC_GEN_CNTL);

	radeon_wait_for_vsync(dev);

	RADEON_WRITE(RADEON_CRTC_GEN_CNTL,
		     (crtc_gen_cntl & ~(RADEON_CRTC_CUR_EN | RADEON_CRTC_ICON_EN)) |
		     RADEON_CRTC_DISP_REQ_EN_B | RADEON_CRTC_EXT_DISP_EN);

	if (!(dev_priv->flags & RADEON_SINGLE_CRTC)) {
		crtc2_gen_cntl = RADEON_READ(RADEON_CRTC2_GEN_CNTL);

		radeon_wait_for_vsync2(dev);
		RADEON_WRITE(RADEON_CRTC2_GEN_CNTL,
			     (crtc2_gen_cntl & 
			      ~(RADEON_CRTC2_CUR_EN | RADEON_CRTC2_ICON_EN)) |
			     RADEON_CRTC2_DISP_REQ_EN_B);
	}

	udelay(500);

	if (radeon_is_r300(dev_priv))
		status_idle = R300_MC_IDLE;
	else
		status_idle = RADEON_MC_IDLE;

	status = radeon_busy_wait(dev, RADEON_MC_STATUS, status_idle, 200000);
	if (status == 0xffffffff) {
		DRM_ERROR("Timeout waiting for memory controller to update settings\n");
		DRM_ERROR("Bad things may or may not happen\n");
	}
}


void radeon_init_memory_map(struct drm_device *dev)
{
	drm_radeon_private_t *dev_priv = dev->dev_private;
	u32 mem_size, aper_size;

	dev_priv->mc_fb_location = radeon_read_fb_location(dev_priv);
	radeon_read_agp_location(dev_priv, &dev_priv->mc_agp_loc_lo, &dev_priv->mc_agp_loc_hi);

	if (dev_priv->chip_family >= CHIP_R600) {
		mem_size = RADEON_READ(R600_CONFIG_MEMSIZE);
		aper_size = RADEON_READ(R600_CONFIG_APER_SIZE);
	} else {
		mem_size = RADEON_READ(RADEON_CONFIG_MEMSIZE);
		aper_size = RADEON_READ(RADEON_CONFIG_APER_SIZE);
	}

	/* M6s report illegal memory size */
	if (mem_size == 0)
		mem_size = 8 * 1024 * 1024;

	/* for RN50/M6/M7 - Novell bug 204882 */
	if (aper_size > mem_size)
		mem_size = aper_size;

	if ((dev_priv->chip_family != CHIP_RS600) &&
	    (dev_priv->chip_family != CHIP_RS690) &&
	    (dev_priv->chip_family != CHIP_RS740)) {
		if (dev_priv->flags & RADEON_IS_IGP)
			dev_priv->mc_fb_location = RADEON_READ(RADEON_NB_TOM);
		else {
			uint32_t aper0_base;

			if (dev_priv->chip_family >= CHIP_R600)
				aper0_base = RADEON_READ(R600_CONFIG_F0_BASE);
			else
				aper0_base = RADEON_READ(RADEON_CONFIG_APER_0_BASE);


			/* Some chips have an "issue" with the memory controller, the
			 * location must be aligned to the size. We just align it down,
			 * too bad if we walk over the top of system memory, we don't
			 * use DMA without a remapped anyway.
			 * Affected chips are rv280, all r3xx, and all r4xx, but not IGP
			 */
			if (dev_priv->chip_family == CHIP_RV280 ||
			    dev_priv->chip_family == CHIP_R300 ||
			    dev_priv->chip_family == CHIP_R350 ||
			    dev_priv->chip_family == CHIP_RV350 ||
			    dev_priv->chip_family == CHIP_RV380 ||
			    dev_priv->chip_family == CHIP_R420 ||
			    dev_priv->chip_family == CHIP_R423 ||
			    dev_priv->chip_family == CHIP_RV410)
				aper0_base &= ~(mem_size - 1);

			if (dev_priv->chip_family >= CHIP_R600) {
				dev_priv->mc_fb_location = (aper0_base >> 24) |
					(((aper0_base + mem_size - 1) & 0xff000000U) >> 8);
			} else {
				dev_priv->mc_fb_location = (aper0_base >> 16) |
					((aper0_base + mem_size - 1) & 0xffff0000U);
			}
		}
	}
	
	if (dev_priv->chip_family >= CHIP_R600)
		dev_priv->fb_location = (dev_priv->mc_fb_location & 0xffff) << 24;
	else
		dev_priv->fb_location = (dev_priv->mc_fb_location & 0xffff) << 16;

	/* updating mc regs here */
	if (radeon_is_avivo(dev_priv))
		avivo_disable_mc_clients(dev);
	else
		legacy_disable_mc_clients(dev);

	radeon_write_fb_location(dev_priv, dev_priv->mc_fb_location);

	if (radeon_is_avivo(dev_priv)) {
		if (dev_priv->chip_family >= CHIP_R600) 
			RADEON_WRITE(R600_HDP_NONSURFACE_BASE, (dev_priv->mc_fb_location << 16) & 0xff0000);
		else
			RADEON_WRITE(AVIVO_HDP_FB_LOCATION, dev_priv->mc_fb_location);
	}

	if (dev_priv->chip_family >= CHIP_R600) {
		dev_priv->fb_location = (radeon_read_fb_location(dev_priv) & 0xffffff) << 24;
		dev_priv->fb_size = ((radeon_read_fb_location(dev_priv) & 0xff000000u) + 0x1000000)
			- dev_priv->fb_location;
	} else {
		dev_priv->fb_location = (radeon_read_fb_location(dev_priv) & 0xffff) << 16;
		dev_priv->fb_size =
			((radeon_read_fb_location(dev_priv) & 0xffff0000u) + 0x10000)
			- dev_priv->fb_location;
	}

	/* add an MTRR for the VRAM */
	dev_priv->aper_size = aper_size;
	dev_priv->vram_mtrr = mtrr_add(dev_priv->fb_aper_offset, dev_priv->aper_size, MTRR_TYPE_WRCOMB, 1);

}

/* init memory manager - start with all of VRAM and a 32MB GART aperture for now */
int radeon_gem_mm_init(struct drm_device *dev)
{
	drm_radeon_private_t *dev_priv = dev->dev_private;
	int ret;
	u32 pg_offset;

	/* init TTM underneath */
	drm_bo_driver_init(dev);

	/* size the mappable VRAM memory for now */
	radeon_vram_setup(dev);
	
	radeon_init_memory_map(dev);

#define VRAM_RESERVE_TEXT (256*1024) /* need to reserve 256 for text mode for now */
	dev_priv->mm.vram_visible -= VRAM_RESERVE_TEXT;
	pg_offset = VRAM_RESERVE_TEXT >> PAGE_SHIFT;
	drm_bo_init_mm(dev, DRM_BO_MEM_VRAM, pg_offset, /*dev_priv->mm.vram_offset >> PAGE_SHIFT,*/
		       ((dev_priv->mm.vram_visible) >> PAGE_SHIFT) - 16,
		       0);


	if (dev_priv->chip_family > CHIP_R600) {
		dev_priv->mm_enabled = true;
		return 0;
	}

	dev_priv->mm.gart_size = (32 * 1024 * 1024);
	dev_priv->mm.gart_start = 0;
	ret = radeon_gart_init(dev);
	if (ret)
		return -EINVAL;
	
	drm_bo_init_mm(dev, DRM_BO_MEM_TT, 0,
		       dev_priv->mm.gart_size >> PAGE_SHIFT,
		       0);

	/* need to allocate some objects in the GART */
	/* ring + ring read ptr */
	ret = radeon_alloc_gart_objects(dev);
	if (ret) {
		radeon_gem_mm_fini(dev);
		return -EINVAL;
	}

	dev_priv->mm_enabled = true;
	return 0;
}

void radeon_gem_mm_fini(struct drm_device *dev)
{
	drm_radeon_private_t *dev_priv = dev->dev_private;

	radeon_gem_dma_bufs_destroy(dev);
	radeon_gem_ib_destroy(dev);

	mutex_lock(&dev->struct_mutex);
		
	if (dev_priv->mm.ring_read.bo) {
		drm_bo_kunmap(&dev_priv->mm.ring_read.kmap);
		drm_bo_usage_deref_locked(&dev_priv->mm.ring_read.bo);
	}

	if (dev_priv->mm.ring.bo) {
		drm_bo_kunmap(&dev_priv->mm.ring.kmap);
		drm_bo_usage_deref_locked(&dev_priv->mm.ring.bo);
	}

	if (drm_bo_clean_mm(dev, DRM_BO_MEM_TT, 1)) {
		DRM_DEBUG("delaying takedown of TTM memory\n");
	}

	if (dev_priv->flags & RADEON_IS_PCIE) {
		if (dev_priv->mm.pcie_table_backup) {
			kfree(dev_priv->mm.pcie_table_backup);
			dev_priv->mm.pcie_table_backup = NULL;
		}
		if (dev_priv->mm.pcie_table.bo) {
			drm_bo_kunmap(&dev_priv->mm.pcie_table.kmap);
			drm_bo_usage_deref_locked(&dev_priv->mm.pcie_table.bo);
		}
	}

	if (drm_bo_clean_mm(dev, DRM_BO_MEM_VRAM, 1)) {
		DRM_DEBUG("delaying takedown of VRAM memory\n");
	}

	if (dev_priv->vram_mtrr)
		mtrr_del(dev_priv->vram_mtrr, dev_priv->fb_aper_offset, dev_priv->aper_size);
	mutex_unlock(&dev->struct_mutex);

	drm_bo_driver_finish(dev);
	dev_priv->mm_enabled = false;
}

int radeon_gem_object_pin(struct drm_gem_object *obj,
			  uint32_t alignment, uint32_t pin_domain)
{
	struct drm_radeon_gem_object *obj_priv;
	int ret;
	uint32_t flags = DRM_BO_FLAG_NO_EVICT;
	uint32_t mask = DRM_BO_FLAG_NO_EVICT;

	obj_priv = obj->driver_private;

	if (pin_domain) {
		mask |= DRM_BO_MASK_MEM;
		if (pin_domain == RADEON_GEM_DOMAIN_GTT)
			flags |= DRM_BO_FLAG_MEM_TT;
		else if (pin_domain == RADEON_GEM_DOMAIN_VRAM)
			flags |= DRM_BO_FLAG_MEM_VRAM;
		else
			return -EINVAL;
	}
	ret = drm_bo_do_validate(obj_priv->bo, flags, mask,
				 DRM_BO_HINT_DONT_FENCE, 0);

	return ret;
}

int radeon_gem_object_unpin(struct drm_gem_object *obj)
{
	struct drm_radeon_gem_object *obj_priv;
	int ret;

	obj_priv = obj->driver_private;

	ret = drm_bo_do_validate(obj_priv->bo, 0, DRM_BO_FLAG_NO_EVICT,
				 DRM_BO_HINT_DONT_FENCE, 0);

	return ret;
}

#define RADEON_IB_MEMORY (1*1024*1024)
#define RADEON_IB_SIZE (65536)

#define RADEON_NUM_IB (RADEON_IB_MEMORY / RADEON_IB_SIZE)

int radeon_gem_ib_get(struct drm_radeon_cs_parser *parser)
{
	int i, index = -1;
	int ret;
	drm_radeon_private_t *dev_priv = parser->dev->dev_private;

	for (i = 0; i < RADEON_NUM_IB; i++) {
		if (!(dev_priv->ib_alloc_bitmap & (1 << i))){
			index = i;
			break;
		}
	}

	/* if all in use we need to wait */
	if (index == -1) {
		for (i = 0; i < RADEON_NUM_IB; i++) {
			if (dev_priv->ib_alloc_bitmap & (1 << i)) {
				mutex_lock(&dev_priv->ib_objs[i]->bo->mutex);
				ret = drm_bo_wait(dev_priv->ib_objs[i]->bo, 0, 1, 0, 0);
				mutex_unlock(&dev_priv->ib_objs[i]->bo->mutex);
				if (ret)
					continue;
				dev_priv->ib_alloc_bitmap &= ~(1 << i);
				index = i;
				break;
			}
		}
	}

	if (index == -1) {
		DRM_ERROR("Major case fail to allocate IB from freelist %llx\n", dev_priv->ib_alloc_bitmap);
		return -EINVAL;
	}
		

	if (parser->chunks[parser->ib_index].length_dw > RADEON_IB_SIZE / sizeof(uint32_t))
		return -EINVAL;

	ret = drm_bo_do_validate(dev_priv->ib_objs[index]->bo, 0,
				 DRM_BO_FLAG_NO_EVICT,
				 0, 0);
	if (ret) {
		DRM_ERROR("Failed to validate IB %d\n", index);
		return -EINVAL;
	}
		
	parser->ib = dev_priv->ib_objs[index]->kmap.virtual;
	parser->card_offset = dev_priv->gart_vm_start + dev_priv->ib_objs[index]->bo->offset;
	dev_priv->ib_alloc_bitmap |= (1 << i);
	return 0;
}

static void radeon_gem_ib_free(struct drm_radeon_cs_parser *parser)
{
	struct drm_device *dev = parser->dev;
	drm_radeon_private_t *dev_priv = dev->dev_private;
	struct drm_fence_object *fence;
	int ret;
	int i;

	for (i = 0; i < RADEON_NUM_IB; i++) {
		if (dev_priv->ib_objs[i]->kmap.virtual == parser->ib) {
			/* emit a fence object */
			ret = drm_fence_buffer_objects(dev, NULL, 0, NULL, &fence);
			dev_priv->irq_emitted = 0;
			if (ret) {
				drm_putback_buffer_objects(dev);
			}
			/* dereference the fence object */
			if (fence)
				drm_fence_usage_deref_unlocked(&fence);
		}
	}

}

static int radeon_gem_ib_destroy(struct drm_device *dev)
{
	drm_radeon_private_t *dev_priv = dev->dev_private;
	int i;

	if (dev_priv->ib_objs) {
		for (i = 0; i < RADEON_NUM_IB; i++) {
			if (dev_priv->ib_objs[i]) {
				drm_bo_kunmap(&dev_priv->ib_objs[i]->kmap);
				drm_bo_usage_deref_unlocked(&dev_priv->ib_objs[i]->bo);
			}
			drm_free(dev_priv->ib_objs[i], sizeof(struct radeon_mm_obj), DRM_MEM_DRIVER);
		}
		drm_free(dev_priv->ib_objs, RADEON_NUM_IB*sizeof(struct radeon_mm_obj *), DRM_MEM_DRIVER);
	}
	dev_priv->ib_objs = NULL;
	return 0;
}

static int radeon_gem_find_reloc(struct drm_radeon_cs_parser *parser,
				 uint32_t offset, uint32_t *handle,
				 uint32_t *read_domains, uint32_t *write_domain)
{
	struct drm_device *dev = parser->dev;
	drm_radeon_private_t *dev_priv = dev->dev_private;
	struct drm_radeon_kernel_chunk *reloc_chunk = &parser->chunks[parser->reloc_index];

	if (!reloc_chunk->kdata)
		return -EINVAL;

	if (offset > reloc_chunk->length_dw){
		DRM_ERROR("Offset larger than chunk %d %d\n", offset, reloc_chunk->length_dw);
		return -EINVAL;
	}

	*handle = reloc_chunk->kdata[offset];
	*read_domains = reloc_chunk->kdata[offset + 1];
	*write_domain = reloc_chunk->kdata[offset + 2];
	return 0;
}

static int radeon_gem_relocate(struct drm_radeon_cs_parser *parser,
			       uint32_t *reloc, uint32_t *offset)
{
	struct drm_device *dev = parser->dev;
	drm_radeon_private_t *dev_priv = dev->dev_private;
	/* relocate the handle */
	uint32_t read_domains, write_domain;
	struct drm_gem_object *obj;
	int flags = 0;
	int ret;
	struct drm_radeon_gem_object *obj_priv;

	if (parser->reloc_index == -1) {
		obj = drm_gem_object_lookup(dev, parser->file_priv, reloc[1]);
		if (!obj)
			return -EINVAL;
		read_domains = reloc[2];
		write_domain = reloc[3];
	} else {
		uint32_t handle;

		/* have to lookup handle in other chunk */
		ret = radeon_gem_find_reloc(parser, reloc[1], &handle, &read_domains, &write_domain);
		if (ret < 0)
			return ret;

		obj = drm_gem_object_lookup(dev, parser->file_priv, handle);
		if (!obj)
			return -EINVAL;
	}

	obj_priv = obj->driver_private;
	radeon_gem_set_domain(obj, read_domains, write_domain, &flags, false);

	obj_priv->bo->mem.flags &= ~DRM_BO_FLAG_CLEAN;
	obj_priv->bo->mem.proposed_flags &= ~DRM_BO_FLAG_CLEAN;

	if (flags == DRM_BO_FLAG_MEM_VRAM)
		*offset = obj_priv->bo->offset + dev_priv->fb_location;
	else if (flags == DRM_BO_FLAG_MEM_TT)
		*offset = obj_priv->bo->offset + dev_priv->gart_vm_start;

	/* BAD BAD BAD - LINKED LIST THE OBJS and UNREF ONCE IB is SUBMITTED */
	drm_gem_object_unreference(obj);
	return 0;
}

/* allocate 1MB of 64k IBs the the kernel can keep mapped */
static int radeon_gem_ib_init(struct drm_device *dev)
{
	drm_radeon_private_t *dev_priv = dev->dev_private;
	int i;
	int ret;

	dev_priv->ib_objs = drm_calloc(RADEON_NUM_IB, sizeof(struct radeon_mm_obj *), DRM_MEM_DRIVER);
	if (!dev_priv->ib_objs)
		goto free_all;

	for (i = 0; i < RADEON_NUM_IB; i++) {
		dev_priv->ib_objs[i] = drm_calloc(1, sizeof(struct radeon_mm_obj), DRM_MEM_DRIVER);
		if (!dev_priv->ib_objs[i])
			goto free_all;

		ret = drm_buffer_object_create(dev, RADEON_IB_SIZE,
					       drm_bo_type_kernel,
					       DRM_BO_FLAG_READ | DRM_BO_FLAG_MEM_TT |
					       DRM_BO_FLAG_MAPPABLE, 0,
					       0, 0, &dev_priv->ib_objs[i]->bo);
		if (ret)
			goto free_all;

		ret = drm_bo_kmap(dev_priv->ib_objs[i]->bo, 0, RADEON_IB_SIZE >> PAGE_SHIFT,
				  &dev_priv->ib_objs[i]->kmap);

		if (ret)
			goto free_all;
	}

	dev_priv->ib_alloc_bitmap = 0;

	dev_priv->cs.ib_get = radeon_gem_ib_get;
	dev_priv->cs.ib_free = radeon_gem_ib_free;

	radeon_cs_init(dev);
	dev_priv->cs.relocate = radeon_gem_relocate;
	return 0;

free_all:
	radeon_gem_ib_destroy(dev);
	return -ENOMEM;
}

#define RADEON_DMA_BUFFER_SIZE (64 * 1024)
#define RADEON_DMA_BUFFER_COUNT (16)


/**
 * Cleanup after an error on one of the addbufs() functions.
 *
 * \param dev DRM device.
 * \param entry buffer entry where the error occurred.
 *
 * Frees any pages and buffers associated with the given entry.
 */
static void drm_cleanup_buf_error(struct drm_device * dev,
				  struct drm_buf_entry * entry)
{
	int i;

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

		entry->seg_count = 0;
	}

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

		entry->buf_count = 0;
	}
}

static int radeon_gem_addbufs(struct drm_device *dev)
{
	struct drm_radeon_private *dev_priv = dev->dev_private;
	struct drm_device_dma *dma = dev->dma;
	struct drm_buf_entry *entry;
	struct drm_buf *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;
	struct drm_buf **temp_buflist;
	
	if (!dma)
		return -EINVAL;

	count = RADEON_DMA_BUFFER_COUNT;
	order = drm_order(RADEON_DMA_BUFFER_SIZE);
	size = 1 << order;

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

	byte_count = 0;
	agp_offset = dev_priv->mm.dma_bufs.bo->offset;

	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);

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

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

	entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
				   DRM_MEM_BUFS);
	if (!entry->buflist) {
		mutex_unlock(&dev->struct_mutex);
		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 = dev_priv->gart_vm_start + 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->file_priv = 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);
			mutex_unlock(&dev->struct_mutex);
			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);
		mutex_unlock(&dev->struct_mutex);
		atomic_dec(&dev->buf_alloc);
		return -ENOMEM;
	}
	dma->buflist = temp_buflist;

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

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

	mutex_unlock(&dev->struct_mutex);

	dma->flags = _DRM_DMA_USE_SG;
	atomic_dec(&dev->buf_alloc);
	return 0;
}

static int radeon_gem_dma_bufs_init(struct drm_device *dev)
{
	struct drm_radeon_private *dev_priv = dev->dev_private;
	int size = RADEON_DMA_BUFFER_SIZE * RADEON_DMA_BUFFER_COUNT;
	int ret;

	ret = drm_dma_setup(dev);
	if (ret < 0)
		return ret;

	ret = drm_buffer_object_create(dev, size, drm_bo_type_kernel,
				       DRM_BO_FLAG_READ | DRM_BO_FLAG_WRITE | DRM_BO_FLAG_NO_EVICT |
				       DRM_BO_FLAG_MEM_TT | DRM_BO_FLAG_MAPPABLE, 0,
				       0, 0, &dev_priv->mm.dma_bufs.bo);
	if (ret) {
		DRM_ERROR("Failed to create DMA bufs\n");
		return -ENOMEM;
	}

	ret = drm_bo_kmap(dev_priv->mm.dma_bufs.bo, 0, size >> PAGE_SHIFT,
			  &dev_priv->mm.dma_bufs.kmap);
	if (ret) {
		DRM_ERROR("Failed to mmap DMA buffers\n");
		return -ENOMEM;
	}
	DRM_DEBUG("\n");
	radeon_gem_addbufs(dev);

	DRM_DEBUG("%lx %d\n", dev_priv->mm.dma_bufs.bo->map_list.hash.key, size);
	dev->agp_buffer_token = dev_priv->mm.dma_bufs.bo->map_list.hash.key << PAGE_SHIFT;
	dev_priv->mm.fake_agp_map.handle = dev_priv->mm.dma_bufs.kmap.virtual;
	dev_priv->mm.fake_agp_map.size = size;
	
	dev->agp_buffer_map = &dev_priv->mm.fake_agp_map;
	dev_priv->gart_buffers_offset = dev_priv->mm.dma_bufs.bo->offset + dev_priv->gart_vm_start;
	return 0;
}

static void radeon_gem_dma_bufs_destroy(struct drm_device *dev)
{

	struct drm_radeon_private *dev_priv = dev->dev_private;
	drm_dma_takedown(dev);

	if (dev_priv->mm.dma_bufs.bo) {
		drm_bo_kunmap(&dev_priv->mm.dma_bufs.kmap);
		drm_bo_usage_deref_unlocked(&dev_priv->mm.dma_bufs.bo);
	}
}


static struct drm_gem_object *gem_object_get(struct drm_device *dev, uint32_t name)
{
	struct drm_gem_object *obj;

	spin_lock(&dev->object_name_lock);
	obj = idr_find(&dev->object_name_idr, name);
	if (obj)
		drm_gem_object_reference(obj);
	spin_unlock(&dev->object_name_lock);
	return obj;
}

void radeon_gem_update_offsets(struct drm_device *dev, struct drm_master *master)
{
	drm_radeon_private_t *dev_priv = dev->dev_private;
	struct drm_radeon_master_private *master_priv = master->driver_priv;
	drm_radeon_sarea_t *sarea_priv = master_priv->sarea_priv;
	struct drm_gem_object *obj;
	struct drm_radeon_gem_object *obj_priv;

	/* update front_pitch_offset and back_pitch_offset */
	obj = gem_object_get(dev, sarea_priv->front_handle);
	if (obj) {
		obj_priv = obj->driver_private;

		dev_priv->front_offset = obj_priv->bo->offset;
		dev_priv->front_pitch_offset = (((sarea_priv->front_pitch / 64) << 22) |
						((obj_priv->bo->offset
						  + dev_priv->fb_location) >> 10));
		drm_gem_object_unreference(obj);
	}

	obj = gem_object_get(dev, sarea_priv->back_handle);
	if (obj) {
		obj_priv = obj->driver_private;
		dev_priv->back_offset = obj_priv->bo->offset;
		dev_priv->back_pitch_offset = (((sarea_priv->back_pitch / 64) << 22) |
						((obj_priv->bo->offset
						  + dev_priv->fb_location) >> 10));
		drm_gem_object_unreference(obj);
	}
	dev_priv->color_fmt = RADEON_COLOR_FORMAT_ARGB8888;

}