From 60456d5c2d25cbe91cd0747d12ec9d909bf8d5b9 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Tue, 26 Sep 2017 16:34:09 +0100
Subject: [PATCH] drm/i915/selftests: Replace wmb() with i915_gem_chipset_flush()
Git-commit: 60456d5c2d25cbe91cd0747d12ec9d909bf8d5b9
Patch-mainline: v4.15-rc1
References: FATE#322643 bsc#1055900

Currently, we are being fairly lazy and only using a wmb() following an
update to an active batch. Previously, we have found that to be
insufficient to ensure that a write from the CPU reaches memory in a
timely fashion, and in some caches we may need to flush a chipset cache.
To that end, we have i915_gem_chipset_flush() so use it.

Suggested-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170926153409.7928-1-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/selftests/i915_gem_request.c |   10 +++++++---
 drivers/gpu/drm/i915/selftests/intel_hangcheck.c  |    7 +++++--
 2 files changed, 12 insertions(+), 5 deletions(-)

--- a/drivers/gpu/drm/i915/selftests/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_request.c
@@ -418,7 +418,10 @@ static struct i915_vma *empty_batch(stru
 		err = PTR_ERR(cmd);
 		goto err;
 	}
+
 	*cmd = MI_BATCH_BUFFER_END;
+	i915_gem_chipset_flush(i915);
+
 	i915_gem_object_unpin_map(obj);
 
 	err = i915_gem_object_set_to_gtt_domain(obj, false);
@@ -605,8 +608,8 @@ static struct i915_vma *recursive_batch(
 		*cmd++ = lower_32_bits(vma->node.start);
 	}
 	*cmd++ = MI_BATCH_BUFFER_END; /* terminate early in case of error */
+	i915_gem_chipset_flush(i915);
 
-	wmb();
 	i915_gem_object_unpin_map(obj);
 
 	return vma;
@@ -625,7 +628,7 @@ static int recursive_batch_resolve(struc
 		return PTR_ERR(cmd);
 
 	*cmd = MI_BATCH_BUFFER_END;
-	wmb();
+	i915_gem_chipset_flush(batch->vm->i915);
 
 	i915_gem_object_unpin_map(batch->obj);
 
@@ -858,7 +861,8 @@ out_request:
 					      I915_MAP_WC);
 		if (!IS_ERR(cmd)) {
 			*cmd = MI_BATCH_BUFFER_END;
-			wmb();
+			i915_gem_chipset_flush(i915);
+
 			i915_gem_object_unpin_map(request[id]->batch->obj);
 		}
 
--- a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
+++ b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
@@ -165,6 +165,7 @@ static int emit_recurse_batch(struct han
 		*batch++ = lower_32_bits(vma->node.start);
 	}
 	*batch++ = MI_BATCH_BUFFER_END; /* not reached */
+	i915_gem_chipset_flush(h->i915);
 
 	flags = 0;
 	if (INTEL_GEN(vm->i915) <= 5)
@@ -231,7 +232,7 @@ static u32 hws_seqno(const struct hang *
 static void hang_fini(struct hang *h)
 {
 	*h->batch = MI_BATCH_BUFFER_END;
-	wmb();
+	i915_gem_chipset_flush(h->i915);
 
 	i915_gem_object_unpin_map(h->obj);
 	i915_gem_object_put(h->obj);
@@ -275,6 +276,8 @@ static int igt_hang_sanitycheck(void *ar
 		i915_gem_request_get(rq);
 
 		*h.batch = MI_BATCH_BUFFER_END;
+		i915_gem_chipset_flush(i915);
+
 		__i915_add_request(rq, true);
 
 		timeout = i915_wait_request(rq,
@@ -765,7 +768,7 @@ static int igt_reset_queue(void *arg)
 		pr_info("%s: Completed %d resets\n", engine->name, count);
 
 		*h.batch = MI_BATCH_BUFFER_END;
-		wmb();
+		i915_gem_chipset_flush(i915);
 
 		i915_gem_request_put(prev);
 	}