Since before the kernel supported I915_EXEC_NO_RELOC, long before our
minimum kernel requirement, the kernel unconditionally invalidated all
GPU TLBs before a batch and flushed all GPU caches after a batch. At
that moment, the only use for read/write domain was for activity
tracking, ensuring that future reads waited for the last writer and
future writes waited for all reads. This only requires a single bit in
the execbuf interface which can be supplied via the NO_RELOC interface,
making the use of relocation domains entirely redundant.
Trimming the excess writes into the array allows the compiler to be much
more frugal:
text data bss dec hex filename
8493790 357184 424944 9275918 8d8a0e i965_dri.baseline
8493758 357184 424944 9275886 8d89ee i965_dri.so
(This text improvement really does come from dropping domains, not from
the new use of C99 initializers.)
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Chris Wilson
ba9b71e56a