On 8/19/2016 11:49 PM, Chris Wilson wrote:
On Fri, Aug 19, 2016 at 02:13:16PM +0530, akash.goel@xxxxxxxxx wrote:
From: Akash Goel <akash.goel@xxxxxxxxx>
In order to have fast reads from the GuC log buffer, used SSE4.1 movntdqa
based memcpy function i915_memcpy_from_wc.
GuC log buffer has a WC type vmalloc mapping and copying using movntqda
from WC type memory is almost as fast as reading from WB memory.
This will further reduce the log buffer sampling time, so is needed dearly
to deal with the flush interrupt storm when GuC is generating logs at a
very high rate.
Ideally SSE 4.1 should be present on all chipsets supporting GuC based
submisssions, but if not then logging will not be enabled.
v2: Rebase.
Suggested-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Akash Goel <akash.goel@xxxxxxxxx>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Should be squashed with patch 16 (use MAP_WC).
Fine will squash, but please could you tell that what issue could be
there with 2 patches being separate. Either both will be merged or none
of them will be merged.
Best regards
Akash
-Chris
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