From 010018638659fbe8332c470e94750daf6ef4ab14 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Sun, 23 Apr 2017 18:06:17 +0100
Subject: [PATCH] drm/i915: Poison the request before emitting commands
Git-commit: 010018638659fbe8332c470e94750daf6ef4ab14
Patch-mainline: v4.13-rc1
References: FATE#322643 bsc#1055900

If we poison the request before we emit commands, it should be easier to
spot when we execute an uninitialised request.

References: https://bugs.freedesktop.org/show_bug.cgi?id=100144
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170423170619.7156-2-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/intel_ringbuffer.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1694,6 +1694,7 @@ u32 *intel_ring_begin(struct drm_i915_ge
 
 	GEM_BUG_ON(ring->emit > ring->size - bytes);
 	cs = ring->vaddr + ring->emit;
+	GEM_DEBUG_EXEC(memset(cs, POISON_INUSE, bytes));
 	ring->emit += bytes;
 	ring->space -= bytes;
 	GEM_BUG_ON(ring->space < 0);