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drm/i915: Perform relocations in CPU domain [if in CPU domain] 

Avoid an early eviction of the batch buffer into the uncached GTT
domain, and so do the relocation fixup in cacheable memory.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2010-10-14 12:44:48 +01:00
parent 2549d6c26c
commit f0c43d9b7e
1 changed files with 29 additions and 26 deletions
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55
drivers/gpu/drm/i915/i915_gem.c
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@ -3124,9 +3124,6 @@ i915_gem_object_set_to_gpu_domain(struct drm_gem_object *obj)
uint32_t flush_domains = 0;
uint32_t old_read_domains;
BUG_ON(obj->pending_read_domains & I915_GEM_DOMAIN_CPU);
BUG_ON(obj->pending_write_domain == I915_GEM_DOMAIN_CPU);
intel_mark_busy(dev, obj);
/*
@ -3298,7 +3295,6 @@ i915_gem_object_pin_and_relocate(struct drm_gem_object *obj,
struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
struct drm_i915_gem_relocation_entry __user *user_relocs;
int i, ret;
void __iomem *reloc_page;
bool need_fence;
need_fence = entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
@ -3342,8 +3338,6 @@ i915_gem_object_pin_and_relocate(struct drm_gem_object *obj,
struct drm_i915_gem_relocation_entry reloc;
struct drm_gem_object *target_obj;
struct drm_i915_gem_object *target_obj_priv;
uint32_t reloc_val, reloc_offset;
uint32_t __iomem *reloc_entry;
ret = __copy_from_user_inatomic(&reloc,
user_relocs+i,
@ -3469,28 +3463,37 @@ i915_gem_object_pin_and_relocate(struct drm_gem_object *obj,
return -EINVAL;
}
ret = i915_gem_object_set_to_gtt_domain(obj, 1);
if (ret != 0) {
drm_gem_object_unreference(target_obj);
i915_gem_object_unpin(obj);
return ret;
reloc.delta += target_obj_priv->gtt_offset;
if (obj->write_domain == I915_GEM_DOMAIN_CPU) {
uint32_t page_offset = reloc.offset & ~PAGE_MASK;
char *vaddr;
vaddr = kmap_atomic(obj_priv->pages[reloc.offset >> PAGE_SHIFT], KM_USER0);
*(uint32_t *)(vaddr + page_offset) = reloc.delta;
kunmap_atomic(vaddr, KM_USER0);
} else {
uint32_t __iomem *reloc_entry;
void __iomem *reloc_page;
int ret;
ret = i915_gem_object_set_to_gtt_domain(obj, 1);
if (ret) {
drm_gem_object_unreference(target_obj);
i915_gem_object_unpin(obj);
return ret;
}
/* Map the page containing the relocation we're going to perform. */
reloc.offset += obj_priv->gtt_offset;
reloc_page = io_mapping_map_atomic_wc(dev_priv->mm.gtt_mapping,
reloc.offset & PAGE_MASK,
KM_USER0);
reloc_entry = (uint32_t __iomem *)
(reloc_page + (reloc.offset & ~PAGE_MASK));
iowrite32(reloc.delta, reloc_entry);
io_mapping_unmap_atomic(reloc_page, KM_USER0);
}
/* Map the page containing the relocation we're going to
* perform.
*/
reloc_offset = obj_priv->gtt_offset + reloc.offset;
reloc_page = io_mapping_map_atomic_wc(dev_priv->mm.gtt_mapping,
(reloc_offset &
~(PAGE_SIZE - 1)),
KM_USER0);
reloc_entry = (uint32_t __iomem *)(reloc_page +
(reloc_offset & (PAGE_SIZE - 1)));
reloc_val = target_obj_priv->gtt_offset + reloc.delta;
writel(reloc_val, reloc_entry);
io_mapping_unmap_atomic(reloc_page, KM_USER0);
drm_gem_object_unreference(target_obj);
}