drm/i915/gvt: Parse default state to update reg whitelist

Rather than break existing context objects by incorrectly forcing them
to rogue cache coherency and trying to assert a new mapping, read the
reg whitelist from the default context image.

And use gvt->gt, never &dev_priv->gt.

Fixes: 493f30cd08 ("drm/i915/gvt: parse init context to update cmd accessible reg whitelist")
Acked-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Wang Zhi <zhi.a.wang@intel.com>
Cc: Yan Zhao <yan.y.zhao@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Zhi Wang <zhi.a.wang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20210129004933.29755-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/gvt/cmd_parser.c

@@ -41,6 +41,7 @@
 #include "gt/intel_lrc.h"
 #include "gt/intel_ring.h"
 #include "gt/intel_gt_requests.h"
+#include "gt/shmem_utils.h"
 #include "gvt.h"
 #include "i915_pvinfo.h"
 #include "trace.h"
@@ -3094,71 +3095,28 @@ int intel_gvt_scan_and_shadow_wa_ctx(struct intel_shadow_wa_ctx *wa_ctx)
  */
 void intel_gvt_update_reg_whitelist(struct intel_vgpu *vgpu)
 {
+	const unsigned long start = LRC_STATE_PN * PAGE_SIZE;
 	struct intel_gvt *gvt = vgpu->gvt;
-	struct drm_i915_private *dev_priv = gvt->gt->i915;
 	struct intel_engine_cs *engine;
 	enum intel_engine_id id;
-	const unsigned long start = LRC_STATE_PN * PAGE_SIZE;
-	struct i915_request *rq;
-	struct intel_vgpu_submission *s = &vgpu->submission;
-	struct i915_request *requests[I915_NUM_ENGINES] = {};
-	bool is_ctx_pinned[I915_NUM_ENGINES] = {};
-	int ret = 0;
 
 	if (gvt->is_reg_whitelist_updated)
 		return;
 
-	for_each_engine(engine, &dev_priv->gt, id) {
-		ret = intel_context_pin(s->shadow[id]);
-		if (ret) {
-			gvt_vgpu_err("fail to pin shadow ctx\n");
-			goto out;
-		}
-		is_ctx_pinned[id] = true;
-
-		rq = i915_request_create(s->shadow[id]);
-		if (IS_ERR(rq)) {
-			gvt_vgpu_err("fail to alloc default request\n");
-			ret = -EIO;
-			goto out;
-		}
-		requests[id] = i915_request_get(rq);
-		i915_request_add(rq);
-	}
-
-	if (intel_gt_wait_for_idle(&dev_priv->gt,
-				I915_GEM_IDLE_TIMEOUT) == -ETIME) {
-		ret = -EIO;
-		goto out;
-	}
-
 	/* scan init ctx to update cmd accessible list */
-	for_each_engine(engine, &dev_priv->gt, id) {
-		int size = engine->context_size - PAGE_SIZE;
-		void *vaddr;
+	for_each_engine(engine, gvt->gt, id) {
 		struct parser_exec_state s;
-		struct drm_i915_gem_object *obj;
-		struct i915_request *rq;
+		void *vaddr;
+		int ret;
 
-		rq = requests[id];
-		GEM_BUG_ON(!i915_request_completed(rq));
-		GEM_BUG_ON(!intel_context_is_pinned(rq->context));
-		obj = rq->context->state->obj;
+		if (!engine->default_state)
+			continue;
 
-		if (!obj) {
-			ret = -EIO;
-			goto out;
-		}
-
-		i915_gem_object_set_cache_coherency(obj,
-						    I915_CACHE_LLC);
-
-		vaddr = i915_gem_object_pin_map(obj, I915_MAP_WB);
+		vaddr = shmem_pin_map(engine->default_state);
 		if (IS_ERR(vaddr)) {
-			gvt_err("failed to pin init ctx obj, ring=%d, err=%lx\n",
-				id, PTR_ERR(vaddr));
-			ret = PTR_ERR(vaddr);
-			goto out;
+			gvt_err("failed to map %s->default state, err:%zd\n",
+				engine->name, PTR_ERR(vaddr));
+			return;
 		}
 
 		s.buf_type = RING_BUFFER_CTX;
@@ -3166,9 +3124,9 @@ void intel_gvt_update_reg_whitelist(struct intel_vgpu *vgpu)
 		s.vgpu = vgpu;
 		s.engine = engine;
 		s.ring_start = 0;
-		s.ring_size = size;
+		s.ring_size = engine->context_size - start;
 		s.ring_head = 0;
-		s.ring_tail = size;
+		s.ring_tail = s.ring_size;
 		s.rb_va = vaddr + start;
 		s.workload = NULL;
 		s.is_ctx_wa = false;
@@ -3176,29 +3134,18 @@ void intel_gvt_update_reg_whitelist(struct intel_vgpu *vgpu)
 
 		/* skipping the first RING_CTX_SIZE(0x50) dwords */
 		ret = ip_gma_set(&s, RING_CTX_SIZE);
-		if (ret) {
-			i915_gem_object_unpin_map(obj);
-			goto out;
+		if (ret == 0) {
+			ret = command_scan(&s, 0, s.ring_size, 0, s.ring_size);
+			if (ret)
+				gvt_err("Scan init ctx error\n");
 		}
 
-		ret = command_scan(&s, 0, size, 0, size);
+		shmem_unpin_map(engine->default_state, vaddr);
 		if (ret)
-			gvt_err("Scan init ctx error\n");
-
-		i915_gem_object_unpin_map(obj);
+			return;
 	}
 
-out:
-	if (!ret)
-		gvt->is_reg_whitelist_updated = true;
-
-	for (id = 0; id < I915_NUM_ENGINES ; id++) {
-		if (requests[id])
-			i915_request_put(requests[id]);
-
-		if (is_ctx_pinned[id])
-			intel_context_unpin(s->shadow[id]);
-	}
+	gvt->is_reg_whitelist_updated = true;
 }
 
 int intel_gvt_scan_engine_context(struct intel_vgpu_workload *workload)