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Add alignment to all aperture allocation requests. 

When pinning buffers, or using execbuffer, allow the application to specify
the necessary aperture allocation alignment constraints.
main
Keith Packard 2008-05-01 20:41:55 -07:00
parent 30efad5113
commit 0d547c9ed9
2 changed files with 21 additions and 10 deletions
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15
linux-core/i915_gem.c
View File

@ -96,21 +96,26 @@ i915_gem_object_unbind(struct drm_device *dev, struct drm_gem_object *obj)
* Finds free space in the GTT aperture and binds the object there.
*/
static int
i915_gem_object_bind_to_gtt(struct drm_device *dev, struct drm_gem_object *obj)
i915_gem_object_bind_to_gtt(struct drm_device *dev, struct drm_gem_object *obj, unsigned alignment)
{
drm_i915_private_t *dev_priv = dev->dev_private;
struct drm_i915_gem_object *obj_priv = obj->driver_private;
struct drm_memrange_node *free_space;
int page_count, i;
if (alignment == 0)
alignment = PAGE_SIZE;
if (alignment & (PAGE_SIZE - 1))
return -EINVAL;
free_space = drm_memrange_search_free(&dev_priv->mm.gtt_space,
obj->size,
PAGE_SIZE, 0);
alignment, 0);
if (free_space == NULL)
return -ENOMEM;
obj_priv->gtt_space = drm_memrange_get_block(free_space,
obj->size,
PAGE_SIZE);
alignment);
if (obj_priv->gtt_space == NULL)
return -ENOMEM;
@ -173,7 +178,7 @@ i915_gem_reloc_and_validate_object(struct drm_device *dev,
/* Choose the GTT offset for our buffer and put it there. */
if (obj_priv->gtt_space == NULL) {
i915_gem_object_bind_to_gtt(dev, obj);
i915_gem_object_bind_to_gtt(dev, obj, (unsigned) entry->alignment);
if (obj_priv->gtt_space == NULL)
return -ENOMEM;
}
@ -367,7 +372,7 @@ i915_gem_pin_ioctl(struct drm_device *dev, void *data,
return -EINVAL;
}
ret = i915_gem_object_bind_to_gtt(dev, obj);
ret = i915_gem_object_bind_to_gtt(dev, obj, (unsigned) args->alignment);
if (ret != 0) {
DRM_ERROR("Failure to bind in i915_gem_pin_ioctl(): %d\n",
ret);

16
shared-core/i915_drm.h
View File

@ -451,15 +451,18 @@ struct drm_i915_gem_validate_entry {
* operation.
*/
uint32_t buffer_handle;
/** List of relocations to be performed on this buffer */
uint32_t relocation_count;
uint64_t relocs_ptr; /* struct drm_i915_gem_relocation_entry *relocs */
/** Required alignment in graphics aperture */
uint64_t alignment;
/**
* Returned value of the updated offset of the buffer, for future
* presumed_offset writes.
*/
uint32_t buffer_offset;
/** List of relocations to be performed on this buffer */
uint64_t relocs_ptr; /* struct drm_i915_gem_relocation_entry *relocs */
uint32_t relocation_count;
uint32_t pad;
uint64_t buffer_offset;
};
struct drm_i915_gem_execbuffer {
@ -488,6 +491,9 @@ struct drm_i915_gem_pin {
/** Handle of the buffer to be pinned. */
uint32_t handle;
uint32_t pad;
/** alignment required within the aperture */
uint64_t alignment;
/** Returned GTT offset of the buffer. */
uint64_t offset;