From 0efa99dd58754d23e884b9ba41cd601f01b58c3d Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Mon, 9 Sep 2019 12:30:18 +0100
Subject: drm/i915/ringbuffer: Flush writes before RING_TAIL update
Git-commit: 0efa99dd58754d23e884b9ba41cd601f01b58c3d
Patch-mainline: v5.5-rc1
References: bsc#1152489
Be paranoid and make sure we flush any and all writes out of the WCB
before performing the UC mmio to update the RING_TAIL. (An UC write
should itself be enough to do the flush, hence the paranoia here.) Quite
infrequently, we see problems where the GPU seems to overshoot the
RING_TAIL and so executes garbage, hence the speculation.
References: https://bugs.freedesktop.org/show_bug.cgi?id=111598
References: https://bugs.freedesktop.org/show_bug.cgi?id=111417
References: https://bugs.freedesktop.org/show_bug.cgi?id=111034
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190909113018.13300-1-chris@chris-wilson.co.uk
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
drivers/gpu/drm/i915/gt/intel_ringbuffer.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/i915/gt/intel_ringbuffer.c b/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
index ac55a0d054bd..a73296e6b13d 100644
--- a/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
@@ -930,6 +930,7 @@ static void cancel_requests(struct intel_engine_cs *engine)
static void i9xx_submit_request(struct i915_request *request)
{
i915_request_submit(request);
+ wmb(); /* paranoid flush writes out of the WCB before mmio */
ENGINE_WRITE(request->engine, RING_TAIL,
intel_ring_set_tail(request->ring, request->tail));
--
2.28.0