[Intel-gfx] [PATCH 09/12] drm/i915/selftests: Replace unbound set-domain waits with explicit timeouts

[Tvrtko Ursulin]

From: Chris Wilson <chris at chris-wilson.co.uk>

Let's prefer to use explicit request tracking and bounded timeouts in
our selftests.

v2 (Tvrtko):
 * Rebase.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld at intel.com> # v1
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
 .../gpu/drm/i915/gt/selftest_workarounds.c    | 107 +++++++-----------
 1 file changed, 40 insertions(+), 67 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/selftest_workarounds.c b/drivers/gpu/drm/i915/gt/selftest_workarounds.c
index 64937ec3f2dc..72553a56b225 100644
--- a/drivers/gpu/drm/i915/gt/selftest_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/selftest_workarounds.c
@@ -93,56 +93,27 @@ reference_lists_fini(struct intel_gt *gt, struct wa_lists *lists)
 	intel_wa_list_free(&lists->gt_wa_list);
 }
 
-static struct drm_i915_gem_object *
-read_nonprivs(struct intel_context *ce)
+static struct i915_request *
+read_nonprivs(struct intel_context *ce, struct i915_vma *result)
 {
 	struct intel_engine_cs *engine = ce->engine;
 	const u32 base = engine->mmio_base;
-	struct drm_i915_gem_object *result;
 	struct i915_request *rq;
-	struct i915_vma *vma;
 	u32 srm, *cs;
 	int err;
 	int i;
 
-	result = i915_gem_object_create_internal(engine->i915, PAGE_SIZE);
-	if (IS_ERR(result))
-		return result;
-
-	i915_gem_object_set_cache_coherency(result, I915_CACHE_LLC);
-
-	cs = i915_gem_object_pin_map_unlocked(result, I915_MAP_WB);
-	if (IS_ERR(cs)) {
-		err = PTR_ERR(cs);
-		goto err_obj;
-	}
-	memset(cs, 0xc5, PAGE_SIZE);
-	i915_gem_object_flush_map(result);
-	i915_gem_object_unpin_map(result);
-
-	vma = i915_vma_instance(result, &engine->gt->ggtt->vm, NULL);
-	if (IS_ERR(vma)) {
-		err = PTR_ERR(vma);
-		goto err_obj;
-	}
-
-	err = i915_vma_pin(vma, 0, 0, PIN_GLOBAL);
-	if (err)
-		goto err_obj;
-
 	rq = intel_context_create_request(ce);
-	if (IS_ERR(rq)) {
-		err = PTR_ERR(rq);
-		goto err_pin;
-	}
+	if (IS_ERR(rq))
+		return rq;
 
-	i915_vma_lock(vma);
-	err = i915_request_await_object(rq, vma->obj, true);
+	i915_vma_lock(result);
+	err = i915_request_await_object(rq, result->obj, true);
 	if (err == 0)
-		err = i915_vma_move_to_active(vma, rq, EXEC_OBJECT_WRITE);
-	i915_vma_unlock(vma);
+		err = i915_vma_move_to_active(result, rq, EXEC_OBJECT_WRITE);
+	i915_vma_unlock(result);
 	if (err)
-		goto err_req;
+		goto err_rq;
 
 	srm = MI_STORE_REGISTER_MEM | MI_SRM_LRM_GLOBAL_GTT;
 	if (INTEL_GEN(engine->i915) >= 8)
@@ -151,28 +122,24 @@ read_nonprivs(struct intel_context *ce)
 	cs = intel_ring_begin(rq, 4 * RING_MAX_NONPRIV_SLOTS);
 	if (IS_ERR(cs)) {
 		err = PTR_ERR(cs);
-		goto err_req;
+		goto err_rq;
 	}
 
 	for (i = 0; i < RING_MAX_NONPRIV_SLOTS; i++) {
 		*cs++ = srm;
 		*cs++ = i915_mmio_reg_offset(RING_FORCE_TO_NONPRIV(base, i));
-		*cs++ = i915_ggtt_offset(vma) + sizeof(u32) * i;
+		*cs++ = i915_ggtt_offset(result) + sizeof(u32) * i;
 		*cs++ = 0;
 	}
 	intel_ring_advance(rq, cs);
 
+	i915_request_get(rq);
 	i915_request_add(rq);
-	i915_vma_unpin(vma);
 
-	return result;
+	return rq;
 
-err_req:
+err_rq:
 	i915_request_add(rq);
-err_pin:
-	i915_vma_unpin(vma);
-err_obj:
-	i915_gem_object_put(result);
 	return ERR_PTR(err);
 }
 
@@ -203,32 +170,36 @@ print_results(const struct intel_engine_cs *engine, const u32 *results)
 static int check_whitelist(struct intel_context *ce)
 {
 	struct intel_engine_cs *engine = ce->engine;
-	struct drm_i915_gem_object *results;
-	struct intel_wedge_me wedge;
+	struct i915_vma *result;
+	struct i915_request *rq;
+	int err = 0;
 	u32 *vaddr;
-	int err;
 	int i;
 
-	results = read_nonprivs(ce);
-	if (IS_ERR(results))
-		return PTR_ERR(results);
-
-	err = 0;
-	i915_gem_object_lock(results, NULL);
-	intel_wedge_on_timeout(&wedge, engine->gt, HZ / 5) /* safety net! */
-		err = i915_gem_object_set_to_cpu_domain(results, false);
-
-	if (intel_gt_is_wedged(engine->gt))
-		err = -EIO;
-	if (err)
-		goto out_put;
+	result = __vm_create_scratch_for_read(&engine->gt->ggtt->vm, PAGE_SIZE);
+	if (IS_ERR(result))
+		return PTR_ERR(result);
 
-	vaddr = i915_gem_object_pin_map(results, I915_MAP_WB);
+	vaddr = i915_gem_object_pin_map(result->obj, I915_MAP_WB);
 	if (IS_ERR(vaddr)) {
 		err = PTR_ERR(vaddr);
 		goto out_put;
 	}
 
+	memset(vaddr, 0xc5, PAGE_SIZE);
+	i915_gem_object_flush_map(result->obj);
+
+	rq = read_nonprivs(ce, result);
+	if (IS_ERR(rq)) {
+		err = PTR_ERR(rq);
+		goto out_map;
+	}
+
+	if (i915_request_wait(rq, 0, HZ / 5) < 0) {
+		err = -EIO;
+		goto out_rq;
+	}
+
 	for (i = 0; i < RING_MAX_NONPRIV_SLOTS; i++) {
 		u32 expected = get_whitelist_reg(engine, i);
 		u32 actual = vaddr[i];
@@ -243,10 +214,12 @@ static int check_whitelist(struct intel_context *ce)
 		}
 	}
 
-	i915_gem_object_unpin_map(results);
+out_rq:
+	i915_request_put(rq);
+out_map:
+	i915_gem_object_unpin_map(result->obj);
 out_put:
-	i915_gem_object_unlock(results);
-	i915_gem_object_put(results);
+	i915_vma_put(result);
 	return err;
 }
 
-- 
2.30.2