On 01/04/16 08:46, Joonas Lahtinen wrote:
According to Chris, use of i915_vm_to_ppgtt is visible in benchmark
unless WARN_ON is removed, so lets get rid of it.
Cc: Chris Wilson <ch...@chris-wilson.co.uk>
Reported-by: Chris Wilson <ch...@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <ch...@chris-wilson.co.uk>
Signed-off-by: Joonas Lahtinen <joonas.lahti...@linux.intel.com>
---
drivers/gpu/drm/i915/i915_drv.h | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index d3ebb2f..0035dc3 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3157,7 +3157,6 @@ bool i915_gem_obj_is_pinned(struct drm_i915_gem_object
*obj);
static inline struct i915_hw_ppgtt *
i915_vm_to_ppgtt(struct i915_address_space *vm)
{
- WARN_ON(i915_is_ggtt(vm));
return container_of(vm, struct i915_hw_ppgtt, base);
}
I shouldn't think the actual check (i915_is_ggtt()) is slowing things
down, so it must be the overhead of an unactivated WARN_ON(), which
probably generates quite a bit of code and may disable optimisations,
even when the code block isn't entered. As an alternative (if you *want*
things to break if this is used incorrectly) you could have it return
NULL for that case:
static inline struct i915_hw_ppgtt *
i915_vm_to_ppgtt(struct i915_address_space *vm)
{
return i915_is_ggtt(vm) ? NULL :
container_of(vm, struct i915_hw_ppgtt, base);
}
Caller will then very likely get an OOPS!
.Dave.
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