From 753bdbd001dca74f9f4528d7be415801f043748a Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Tue, 24 Oct 2017 21:50:53 +0100
Subject: [PATCH] drm/i915: Call cond_resched() before repeating i915_gem_evict_something()
Git-commit: 753bdbd001dca74f9f4528d7be415801f043748a
Patch-mainline: v4.16-rc1
References: FATE#322643 bsc#1055900

Insert a breakpoint, a chance to escape back to the scheduler and run
something else for a bit, if we find that the GGTT is full and needs to
be idled in order to make some room. In practice, this should only be an
issue in stress tests as the wait itself will normally give the chance
for the scheduler to intervene and make progress.

References: https://bugs.freedesktop.org/show_bug.cgi?id=103438
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171024205053.7845-1-chris@chris-wilson.co.uk
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/i915_gem_evict.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/i915/i915_gem_evict.c
+++ b/drivers/gpu/drm/i915/i915_gem_evict.c
@@ -216,6 +216,7 @@ search_again:
 		if (ret)
 			return ret;
 
+		cond_resched();
 		goto search_again;
 	}