[Intel-gfx] [PATCH 4/7] drm/i915: always pin lrc context for vgpu with Intel GVT-g

[Zhiyuan Lv]

Intel GVT-g will perform EXECLIST context shadowing and ring buffer
shadowing. The shadow copy is created when guest creates a context.
If a context changes its LRCA address, the hypervisor is hard to know
whether it is a new context or not. We always pin context objects to
global GTT to make life easier.

Signed-off-by: Zhiyuan Lv <zhiyuan.lv at intel.com>
Signed-off-by: Zhi Wang <zhi.a.wang at intel.com>
---
 drivers/gpu/drm/i915/intel_lrc.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 39df304..4b2ac37 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -2282,7 +2282,8 @@ void intel_lr_context_free(struct intel_context *ctx)
 					ctx->engine[i].ringbuf;
 			struct intel_engine_cs *ring = ringbuf->ring;
 
-			if (ctx == ring->default_context) {
+			if ((ctx == ring->default_context) ||
+			    (intel_vgpu_active(ring->dev))) {
 				intel_unpin_ringbuffer_obj(ringbuf);
 				i915_gem_object_ggtt_unpin(ctx_obj);
 			}
@@ -2353,6 +2354,8 @@ int intel_lr_context_deferred_create(struct intel_context *ctx,
 				     struct intel_engine_cs *ring)
 {
 	const bool is_global_default_ctx = (ctx == ring->default_context);
+	const bool need_to_pin_ctx = (is_global_default_ctx ||
+				      (intel_vgpu_active(ring->dev)));
 	struct drm_device *dev = ring->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct drm_i915_gem_object *ctx_obj;
@@ -2374,7 +2377,7 @@ int intel_lr_context_deferred_create(struct intel_context *ctx,
 		return -ENOMEM;
 	}
 
-	if (is_global_default_ctx) {
+	if (need_to_pin_ctx) {
 		ret = i915_gem_obj_ggtt_pin(ctx_obj, GEN8_LR_CONTEXT_ALIGN,
 				PIN_OFFSET_BIAS | GUC_WOPCM_TOP);
 		if (ret) {
@@ -2415,7 +2418,7 @@ int intel_lr_context_deferred_create(struct intel_context *ctx,
 			goto error_free_rbuf;
 		}
 
-		if (is_global_default_ctx) {
+		if (need_to_pin_ctx) {
 			ret = intel_pin_and_map_ringbuffer_obj(dev, ringbuf);
 			if (ret) {
 				DRM_ERROR(
@@ -2464,14 +2467,14 @@ int intel_lr_context_deferred_create(struct intel_context *ctx,
 	return 0;
 
 error:
-	if (is_global_default_ctx)
+	if (need_to_pin_ctx)
 		intel_unpin_ringbuffer_obj(ringbuf);
 error_destroy_rbuf:
 	intel_destroy_ringbuffer_obj(ringbuf);
 error_free_rbuf:
 	kfree(ringbuf);
 error_unpin_ctx:
-	if (is_global_default_ctx)
+	if (need_to_pin_ctx)
 		i915_gem_object_ggtt_unpin(ctx_obj);
 	drm_gem_object_unreference(&ctx_obj->base);
 	return ret;
-- 
1.9.1