drm/i915: Fix workarounds selftest, part 1

pin_map needs the ww lock, so ensure we pin both before submission.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
[danvet: Again pick older version just to side-step conflicts.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210128162612.927917-32-maarten.lankhorst@linux.intel.com
Link: https://patchwork.freedesktop.org/patch/msgid/20210323155059.628690-32-maarten.lankhorst@linux.intel.com

drivers/gpu/drm/i915/gem/i915_gem_object.h

@@ -411,6 +411,9 @@ void i915_gem_object_writeback(struct drm_i915_gem_object *obj);
 void *__must_check i915_gem_object_pin_map(struct drm_i915_gem_object *obj,
 					   enum i915_map_type type);
 
+void *__must_check i915_gem_object_pin_map_unlocked(struct drm_i915_gem_object *obj,
+						    enum i915_map_type type);
+
 void __i915_gem_object_flush_map(struct drm_i915_gem_object *obj,
 				 unsigned long offset,
 				 unsigned long size);

drivers/gpu/drm/i915/gem/i915_gem_pages.c

@@ -400,6 +400,18 @@ void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj,
 	goto out_unlock;
 }
 
+void *i915_gem_object_pin_map_unlocked(struct drm_i915_gem_object *obj,
+				       enum i915_map_type type)
+{
+	void *ret;
+
+	i915_gem_object_lock(obj, NULL);
+	ret = i915_gem_object_pin_map(obj, type);
+	i915_gem_object_unlock(obj);
+
+	return ret;
+}
+
 void __i915_gem_object_flush_map(struct drm_i915_gem_object *obj,
 				 unsigned long offset,
 				 unsigned long size)

drivers/gpu/drm/i915/gt/selftest_workarounds.c

@@ -112,7 +112,7 @@ read_nonprivs(struct intel_context *ce)
 
 	i915_gem_object_set_cache_coherency(result, I915_CACHE_LLC);
 
-	cs = i915_gem_object_pin_map(result, I915_MAP_WB);
+	cs = i915_gem_object_pin_map_unlocked(result, I915_MAP_WB);
 	if (IS_ERR(cs)) {
 		err = PTR_ERR(cs);
 		goto err_obj;
@@ -218,7 +218,7 @@ static int check_whitelist(struct intel_context *ce)
 	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);
-	i915_gem_object_unlock(results);
+
 	if (intel_gt_is_wedged(engine->gt))
 		err = -EIO;
 	if (err)
@@ -246,6 +246,7 @@ static int check_whitelist(struct intel_context *ce)
 
 	i915_gem_object_unpin_map(results);
 out_put:
+	i915_gem_object_unlock(results);
 	i915_gem_object_put(results);
 	return err;
 }
@@ -502,6 +503,7 @@ static int check_dirty_whitelist(struct intel_context *ce)
 
 	for (i = 0; i < engine->whitelist.count; i++) {
 		u32 reg = i915_mmio_reg_offset(engine->whitelist.list[i].reg);
+		struct i915_gem_ww_ctx ww;
 		u64 addr = scratch->node.start;
 		struct i915_request *rq;
 		u32 srm, lrm, rsvd;
@@ -517,6 +519,29 @@ static int check_dirty_whitelist(struct intel_context *ce)
 
 		ro_reg = ro_register(reg);
 
+		i915_gem_ww_ctx_init(&ww, false);
+retry:
+		cs = NULL;
+		err = i915_gem_object_lock(scratch->obj, &ww);
+		if (!err)
+			err = i915_gem_object_lock(batch->obj, &ww);
+		if (!err)
+			err = intel_context_pin_ww(ce, &ww);
+		if (err)
+			goto out;
+
+		cs = i915_gem_object_pin_map(batch->obj, I915_MAP_WC);
+		if (IS_ERR(cs)) {
+			err = PTR_ERR(cs);
+			goto out_ctx;
+		}
+
+		results = i915_gem_object_pin_map(scratch->obj, I915_MAP_WB);
+		if (IS_ERR(results)) {
+			err = PTR_ERR(results);
+			goto out_unmap_batch;
+		}
+
 		/* Clear non priv flags */
 		reg &= RING_FORCE_TO_NONPRIV_ADDRESS_MASK;
 
@@ -528,12 +553,6 @@ static int check_dirty_whitelist(struct intel_context *ce)
 		pr_debug("%s: Writing garbage to %x\n",
 			 engine->name, reg);
 
-		cs = i915_gem_object_pin_map(batch->obj, I915_MAP_WC);
-		if (IS_ERR(cs)) {
-			err = PTR_ERR(cs);
-			goto out_batch;
-		}
-
 		/* SRM original */
 		*cs++ = srm;
 		*cs++ = reg;
@@ -580,11 +599,12 @@ static int check_dirty_whitelist(struct intel_context *ce)
 		i915_gem_object_flush_map(batch->obj);
 		i915_gem_object_unpin_map(batch->obj);
 		intel_gt_chipset_flush(engine->gt);
+		cs = NULL;
 
-		rq = intel_context_create_request(ce);
+		rq = i915_request_create(ce);
 		if (IS_ERR(rq)) {
 			err = PTR_ERR(rq);
-			goto out_batch;
+			goto out_unmap_scratch;
 		}
 
 		if (engine->emit_init_breadcrumb) { /* Be nice if we hang */
@@ -593,20 +613,16 @@ static int check_dirty_whitelist(struct intel_context *ce)
 				goto err_request;
 		}
 
-		i915_vma_lock(batch);
 		err = i915_request_await_object(rq, batch->obj, false);
 		if (err == 0)
 			err = i915_vma_move_to_active(batch, rq, 0);
-		i915_vma_unlock(batch);
 		if (err)
 			goto err_request;
 
-		i915_vma_lock(scratch);
 		err = i915_request_await_object(rq, scratch->obj, true);
 		if (err == 0)
 			err = i915_vma_move_to_active(scratch, rq,
 						      EXEC_OBJECT_WRITE);
-		i915_vma_unlock(scratch);
 		if (err)
 			goto err_request;
 
@@ -622,13 +638,7 @@ static int check_dirty_whitelist(struct intel_context *ce)
 			pr_err("%s: Futzing %x timedout; cancelling test\n",
 			       engine->name, reg);
 			intel_gt_set_wedged(engine->gt);
-			goto out_batch;
-		}
-
-		results = i915_gem_object_pin_map(scratch->obj, I915_MAP_WB);
-		if (IS_ERR(results)) {
-			err = PTR_ERR(results);
-			goto out_batch;
+			goto out_unmap_scratch;
 		}
 
 		GEM_BUG_ON(values[ARRAY_SIZE(values) - 1] != 0xffffffff);
@@ -639,7 +649,7 @@ static int check_dirty_whitelist(struct intel_context *ce)
 				pr_err("%s: Unable to write to whitelisted register %x\n",
 				       engine->name, reg);
 				err = -EINVAL;
-				goto out_unpin;
+				goto out_unmap_scratch;
 			}
 		} else {
 			rsvd = 0;
@@ -705,15 +715,27 @@ static int check_dirty_whitelist(struct intel_context *ce)
 
 			err = -EINVAL;
 		}
-out_unpin:
+out_unmap_scratch:
 		i915_gem_object_unpin_map(scratch->obj);
+out_unmap_batch:
+		if (cs)
+			i915_gem_object_unpin_map(batch->obj);
+out_ctx:
+		intel_context_unpin(ce);
+out:
+		if (err == -EDEADLK) {
+			err = i915_gem_ww_ctx_backoff(&ww);
+			if (!err)
+				goto retry;
+		}
+		i915_gem_ww_ctx_fini(&ww);
 		if (err)
 			break;
 	}
 
 	if (igt_flush_test(engine->i915))
 		err = -EIO;
-out_batch:
+
 	i915_vma_unpin_and_release(&batch, 0);
 out_scratch:
 	i915_vma_unpin_and_release(&scratch, 0);
@@ -847,7 +869,7 @@ static int scrub_whitelisted_registers(struct intel_context *ce)
 	if (IS_ERR(batch))
 		return PTR_ERR(batch);
 
-	cs = i915_gem_object_pin_map(batch->obj, I915_MAP_WC);
+	cs = i915_gem_object_pin_map_unlocked(batch->obj, I915_MAP_WC);
 	if (IS_ERR(cs)) {
 		err = PTR_ERR(cs);
 		goto err_batch;
@@ -982,11 +1004,11 @@ check_whitelisted_registers(struct intel_engine_cs *engine,
 	u32 *a, *b;
 	int i, err;
 
-	a = i915_gem_object_pin_map(A->obj, I915_MAP_WB);
+	a = i915_gem_object_pin_map_unlocked(A->obj, I915_MAP_WB);
 	if (IS_ERR(a))
 		return PTR_ERR(a);
 
-	b = i915_gem_object_pin_map(B->obj, I915_MAP_WB);
+	b = i915_gem_object_pin_map_unlocked(B->obj, I915_MAP_WB);
 	if (IS_ERR(b)) {
 		err = PTR_ERR(b);
 		goto err_a;