[Mesa-dev] [PATCH 00/10] Die, blitter, die!

[Pohjolainen, Topi]

On Fri, May 11, 2018 at 04:48:16PM -0700, Jason Ekstrand wrote:
> This patch series completely kills off our usage of the hardware blitter
> for Sandy Bridge and later.  On Sandy Bridge, the blitter was moved to
> another ring and so using it incurs noticable synchronization overhead and,
> at the same time, that synchronization is an endless source of GPU hangs on
> SNB.  Some time around the Ivy Bridge time frame, we suspect that the
> blitter ended up with somewhat slower paths to memory than the 3D engine so
> it's slower in general.
> 
> To make matters worse, the blitter does not understand any sort of
> compression at all and so using it frequently means having to do some sort
> of resolve operation.  This is especially bad on gen9 where we have CCS
> compression enabled on almost everything.  By using blorp for things like
> miptree mapping, we can avoid decompressing and even get free compression
> on unmap as-needed.
> 
> Jason Ekstrand (10):
>   i965: Use meta for pixel ops on gen6+
>   i965/blit: Delete intel_emit_linear_blit
>   i965: Remove some unused includes of intel_blit.h
>   i965: Don't fall back to the blitter in BlitFramebuffer
>   i965: Delete the blitter path for CopyTexSubImage
>   i965/miptree: Use blorp for validation tex copies on gen6+
>   i965/miptree: Use blorp for blit maps on gen6+

Patches 2-7:

Reviewed-by: Topi Pohjolainen <topi.pohjolainen at intel.com>

>   i965: Remove support for the BLT ring
>   i965/miptree: Move the access_raw call to the individual map functions
>   intel/blorp: Use linear formats for CCS_E clear colors in copies
> 
>  src/intel/blorp/blorp_blit.c                   |  4 +-
>  src/mesa/drivers/dri/i965/brw_clear.c          |  1 -
>  src/mesa/drivers/dri/i965/intel_batchbuffer.c  | 12 +---
>  src/mesa/drivers/dri/i965/intel_blit.c         | 56 ----------------
>  src/mesa/drivers/dri/i965/intel_blit.h         |  6 --
>  src/mesa/drivers/dri/i965/intel_fbo.c          |  8 ---
>  src/mesa/drivers/dri/i965/intel_mipmap_tree.c  | 92 +++++++++++++++++++-------
>  src/mesa/drivers/dri/i965/intel_pixel_bitmap.c |  6 +-
>  src/mesa/drivers/dri/i965/intel_pixel_copy.c   |  5 +-
>  src/mesa/drivers/dri/i965/intel_pixel_draw.c   |  3 +-
>  src/mesa/drivers/dri/i965/intel_pixel_read.c   |  1 -
>  src/mesa/drivers/dri/i965/intel_tex_copy.c     | 58 ----------------
>  src/mesa/drivers/dri/i965/intel_tex_image.c    |  1 -
>  src/mesa/drivers/dri/i965/intel_tex_validate.c |  1 -
>  14 files changed, 82 insertions(+), 172 deletions(-)
> 
> -- 
> 2.5.0.400.gff86faf
> 
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