On Fri, Mar 27, 2015 at 11:02:01AM +0000, Chris Wilson wrote:
> The multiple levels of indirect do nothing but hinder the compiler and
> the pointer chasing turns to be quite painful but painless to fix.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Hm I did a quick git grep when this came up a few days back on irc, and
just removing the checks from the execbuf hotpaths looked like the simpler
approach. We don't need them, since NORMAL_VIEW == 0 is intentional.
There's still some left afterwards ofc, but no check beats even a fast
check ;-)
-Daniel
> ---
> drivers/gpu/drm/i915/i915_drv.h | 4 +---
> drivers/gpu/drm/i915/i915_gem_gtt.c | 1 +
> drivers/gpu/drm/i915/i915_gem_gtt.h | 2 ++
> 3 files changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index b728250d6550..209c9b612509 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -2880,9 +2880,7 @@ bool i915_gem_obj_is_pinned(struct drm_i915_gem_object *obj);
> (&((struct drm_i915_private *)(obj)->base.dev->dev_private)->gtt.base)
> static inline bool i915_is_ggtt(struct i915_address_space *vm)
> {
> - struct i915_address_space *ggtt =
> - &((struct drm_i915_private *)(vm)->dev->dev_private)->gtt.base;
> - return vm == ggtt;
> + return vm->is_ggtt;
> }
>
> static inline struct i915_hw_ppgtt *
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index e33b1214c4d8..68c1f49f2864 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -2504,6 +2504,7 @@ int i915_gem_gtt_init(struct drm_device *dev)
> return ret;
>
> gtt->base.dev = dev;
> + gtt->base.is_ggtt = true;
>
> /* GMADR is the PCI mmio aperture into the global GTT. */
> DRM_INFO("Memory usable by graphics device = %zdM\n",
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
> index 3f0ad9f25441..20398a18a8a6 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.h
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
> @@ -234,6 +234,8 @@ struct i915_address_space {
> unsigned long start; /* Start offset always 0 for dri2 */
> size_t total; /* size addr space maps (ex. 2GB for ggtt) */
>
> + bool is_ggtt;
> +
> struct {
> dma_addr_t addr;
> struct page *page;
> --
> 2.1.4
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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