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From:   Mauro Carvalho Chehab <mchehab@kernel.org>
Cc:     Chris Wilson <chris.p.wilson@intel.com>,
        Andi Shyti <andi.shyti@linux.intel.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>,
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        Fei Yang <fei.yang@intel.com>,
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Subject: [PATCH v2 05/21] drm/i915/gt: Skip TLB invalidations once wedged
Date:   Thu, 14 Jul 2022 13:06:10 +0100
Message-Id: <f20bd21c94610dae59824b8040e5a9400de6f963.1657800199.git.mchehab@kernel.org>
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From: Chris Wilson <chris.p.wilson@intel.com>

Skip all further TLB invalidations once the device is wedged and
had been reset, as, on such cases, it can no longer process instructions
on the GPU and the user no longer has access to the TLB's in each engine.

That helps to reduce the performance regression introduced by TLB
invalidate logic.

Cc: stable@vger.kernel.org
Fixes: 7938d61591d3 ("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>
Cc: Andi Shyti <andi.shyti@linux.intel.com>
Acked-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
---

To avoid mailbombing on a large number of people, only mailing lists were C/C on the cover.
See [PATCH v2 00/21] at: https://lore.kernel.org/all/cover.1657800199.git.mchehab@kernel.org/

 drivers/gpu/drm/i915/gt/intel_gt.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index 1d84418e8676..5c55a90672f4 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -934,6 +934,9 @@ void intel_gt_invalidate_tlbs(struct intel_gt *gt)
 	if (I915_SELFTEST_ONLY(gt->awake == -ENODEV))
 		return;
 
+	if (intel_gt_is_wedged(gt))
+		return;
+
 	if (GRAPHICS_VER(i915) == 12) {
 		regs = gen12_regs;
 		num = ARRAY_SIZE(gen12_regs);
-- 
2.36.1