[PATCH 4/6] drm/i915/selftests: Use a sacrificial context for hang testing

[Chris Wilson]

Avoid injecting hangs in to the i915->kernel_context in case the GPU
reset leaves corruption in the context image in its wake (leading to
continual failures and system hangs after the selftests are ostensibly
complete). Use a sacrificial kernel_context instead.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
Cc: Michel Thierry <michel.thierry at intel.com
---
 drivers/gpu/drm/i915/selftests/intel_hangcheck.c | 41 ++++++++++++++----------
 1 file changed, 24 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
index d1f91a533afa..e800286f064c 100644
--- a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
+++ b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
@@ -33,6 +33,7 @@ struct hang {
 	struct drm_i915_private *i915;
 	struct drm_i915_gem_object *hws;
 	struct drm_i915_gem_object *obj;
+	struct i915_gem_context *ctx;
 	u32 *seqno;
 	u32 *batch;
 };
@@ -45,9 +46,15 @@ static int hang_init(struct hang *h, struct drm_i915_private *i915)
 	memset(h, 0, sizeof(*h));
 	h->i915 = i915;
 
+	h->ctx = i915_gem_context_create_kernel(i915, I915_PRIORITY_MAX);
+	if (IS_ERR(h->ctx))
+		return PTR_ERR(h->ctx);
+
 	h->hws = i915_gem_object_create_internal(i915, PAGE_SIZE);
-	if (IS_ERR(h->hws))
-		return PTR_ERR(h->hws);
+	if (IS_ERR(h->hws)) {
+		err = PTR_ERR(h->hws);
+		goto err_ctx;
+	}
 
 	h->obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
 	if (IS_ERR(h->obj)) {
@@ -79,6 +86,9 @@ static int hang_init(struct hang *h, struct drm_i915_private *i915)
 	i915_gem_object_put(h->obj);
 err_hws:
 	i915_gem_object_put(h->hws);
+err_ctx:
+	i915_gem_context_set_closed(h->ctx);
+	i915_gem_context_put(h->ctx);
 	return err;
 }
 
@@ -196,9 +206,7 @@ static int emit_recurse_batch(struct hang *h,
 }
 
 static struct drm_i915_gem_request *
-hang_create_request(struct hang *h,
-		    struct intel_engine_cs *engine,
-		    struct i915_gem_context *ctx)
+hang_create_request(struct hang *h, struct intel_engine_cs *engine)
 {
 	struct drm_i915_gem_request *rq;
 	int err;
@@ -225,7 +233,7 @@ hang_create_request(struct hang *h,
 		h->batch = vaddr;
 	}
 
-	rq = i915_gem_request_alloc(engine, ctx);
+	rq = i915_gem_request_alloc(engine, h->ctx);
 	if (IS_ERR(rq))
 		return rq;
 
@@ -255,6 +263,9 @@ static void hang_fini(struct hang *h)
 	i915_gem_object_unpin_map(h->hws);
 	i915_gem_object_put(h->hws);
 
+	i915_gem_context_set_closed(h->ctx);
+	i915_gem_context_put(h->ctx);
+
 	i915_gem_wait_for_idle(h->i915, I915_WAIT_LOCKED);
 }
 
@@ -290,7 +301,7 @@ static int igt_hang_sanitycheck(void *arg)
 		if (!intel_engine_can_store_dword(engine))
 			continue;
 
-		rq = hang_create_request(&h, engine, i915->kernel_context);
+		rq = hang_create_request(&h, engine);
 		if (IS_ERR(rq)) {
 			err = PTR_ERR(rq);
 			pr_err("Failed to create request for %s, err=%d\n",
@@ -427,8 +438,7 @@ static int __igt_reset_engine(struct drm_i915_private *i915, bool active)
 				struct drm_i915_gem_request *rq;
 
 				mutex_lock(&i915->drm.struct_mutex);
-				rq = hang_create_request(&h, engine,
-							 i915->kernel_context);
+				rq = hang_create_request(&h, engine);
 				if (IS_ERR(rq)) {
 					err = PTR_ERR(rq);
 					mutex_unlock(&i915->drm.struct_mutex);
@@ -633,8 +643,7 @@ static int __igt_reset_engine_others(struct drm_i915_private *i915,
 				struct drm_i915_gem_request *rq;
 
 				mutex_lock(&i915->drm.struct_mutex);
-				rq = hang_create_request(&h, engine,
-							 i915->kernel_context);
+				rq = hang_create_request(&h, engine);
 				if (IS_ERR(rq)) {
 					err = PTR_ERR(rq);
 					mutex_unlock(&i915->drm.struct_mutex);
@@ -787,7 +796,7 @@ static int igt_wait_reset(void *arg)
 	if (err)
 		goto unlock;
 
-	rq = hang_create_request(&h, i915->engine[RCS], i915->kernel_context);
+	rq = hang_create_request(&h, i915->engine[RCS]);
 	if (IS_ERR(rq)) {
 		err = PTR_ERR(rq);
 		goto fini;
@@ -866,7 +875,7 @@ static int igt_reset_queue(void *arg)
 		if (!intel_engine_can_store_dword(engine))
 			continue;
 
-		prev = hang_create_request(&h, engine, i915->kernel_context);
+		prev = hang_create_request(&h, engine);
 		if (IS_ERR(prev)) {
 			err = PTR_ERR(prev);
 			goto fini;
@@ -880,9 +889,7 @@ static int igt_reset_queue(void *arg)
 			struct drm_i915_gem_request *rq;
 			unsigned int reset_count;
 
-			rq = hang_create_request(&h,
-						 engine,
-						 i915->kernel_context);
+			rq = hang_create_request(&h, engine);
 			if (IS_ERR(rq)) {
 				err = PTR_ERR(rq);
 				goto fini;
@@ -989,7 +996,7 @@ static int igt_handle_error(void *arg)
 	if (err)
 		goto err_unlock;
 
-	rq = hang_create_request(&h, engine, i915->kernel_context);
+	rq = hang_create_request(&h, engine);
 	if (IS_ERR(rq)) {
 		err = PTR_ERR(rq);
 		goto err_fini;
-- 
2.15.1