FAILED: patch "[PATCH] drm/i915/gt: Skip TLB invalidations once wedged" failed to apply to 4.19-stable tree

The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From e5a95c83ed1492c0f442b448b20c90c8faaf702b Mon Sep 17 00:00:00 2001
From: Chris Wilson <[email protected]>
Date: Wed, 27 Jul 2022 14:29:54 +0200
Subject: [PATCH] drm/i915/gt: Skip TLB invalidations once wedged
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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.

So, an attempt to do a TLB cache invalidation will produce a timeout.

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

index 1d84418e8676..5c55a90672f4 100644
@@ -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);