drm/i915/gt: Ignore TLB invalidations on idle engines

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Check if the device is powered down prior to any engine activity,
as, on such cases, all the TLBs were already invalidated, so an
explicit TLB invalidation is not needed, thus reducing the
performance regression impact due to it.

This becomes more significant with GuC, as it can only do so when
the connection to the GuC is awake.

Cc: stable@vger.kernel.org
Fixes: 7938d61591 ("drm/i915: Flush TLBs before releasing backing store")
Signed-off-by: Chris Wilson <chris.p.wilson@intel.com>
Cc: Fei Yang <fei.yang@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Acked-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Acked-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/278a57a672edac75683f0818b292e95da583a5fe.1658924372.git.mchehab@kernel.org

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This commit is contained in:

Chris Wilson 2022-07-27 14:29:51 +02:00 • committed by Andi Shyti

parent 353819d85f

commit 4bedceaed1

3 changed files with 19 additions and 11 deletions

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10

drivers/gpu/drm/i915/gem/i915_gem_pages.c

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17

drivers/gpu/drm/i915/gt/intel_gt.c

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3

drivers/gpu/drm/i915/gt/intel_gt_pm.h

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