drm/i915: Allow execbuffer to use the first object as the batch
Currently, the last object in the execlist is the always the batch.
However, when building the batch buffer we often know the batch object
first and if we can use the first slot in the execlist we can emit
relocation instructions relative to it immediately and avoid a separate
pass to adjust the relocations to point to the last execlist slot.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index f4b02ef..e262133 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -645,7 +645,10 @@ ht_needs_resize(const struct i915_gem_context_vma_lut *lut)
static unsigned int eb_batch_index(const struct i915_execbuffer *eb)
{
- return eb->buffer_count - 1;
+ if (eb->args->flags & I915_EXEC_BATCH_FIRST)
+ return 0;
+ else
+ return eb->buffer_count - 1;
}
static int eb_select_context(struct i915_execbuffer *eb)