drm/i915/guc: Reset GuC ADS during sanitize

GuC stores some data in there, which might be stale after a reset.
Reinitialize whole ADS in case any part of it was corrupted during
previous GuC run.

v2: s/reinit/init, update functions descriptions (Tomek/Michal)
v3: reset ADS right before fw upload
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: MichaĹ Winiarski <michal.winiarski@intel.com>
Cc: Tomasz Lis <tomasz.lis@intel.com>
Reviewed-by: Tomasz Lis <tomasz.lis@intel.com> #v2
Reviewed-by: MichaĹ Winiarski <michal.winiarski@intel.com> #v2
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190527183613.17076-5-michal.wajdeczko@intel.com

drivers/gpu/drm/i915/intel_guc_ads.c

@@ -72,17 +72,8 @@ static void guc_ct_pool_entries_init(struct guc_ct_pool_entry *pool, u32 num)
  */
 #define LR_HW_CONTEXT_SIZE	(80 * sizeof(u32))
 
-/**
- * intel_guc_ads_create() - creates GuC ADS
- * @guc: intel_guc struct
- *
- */
-int intel_guc_ads_create(struct intel_guc *guc)
-{
-	struct drm_i915_private *dev_priv = guc_to_i915(guc);
-	struct i915_vma *vma;
-	/* The ads obj includes the struct itself and buffers passed to GuC */
-	struct {
+/* The ads obj includes the struct itself and buffers passed to GuC */
+struct __guc_ads_blob {
 	struct guc_ads ads;
 	struct guc_policies policies;
 	struct guc_mmio_reg_state reg_state;
@@ -90,25 +81,19 @@ int intel_guc_ads_create(struct intel_guc *guc)
 	struct guc_clients_info clients_info;
 	struct guc_ct_pool_entry ct_pool[GUC_CT_POOL_SIZE];
 	u8 reg_state_buffer[GUC_S3_SAVE_SPACE_PAGES * PAGE_SIZE];
-	} __packed *blob;
+} __packed;
+
+static int __guc_ads_init(struct intel_guc *guc)
+{
+	struct drm_i915_private *dev_priv = guc_to_i915(guc);
+	struct __guc_ads_blob *blob;
 	const u32 skipped_size = LRC_PPHWSP_SZ * PAGE_SIZE + LR_HW_CONTEXT_SIZE;
 	u32 base;
 	u8 engine_class;
-	int ret;
-
-	GEM_BUG_ON(guc->ads_vma);
-
-	vma = intel_guc_allocate_vma(guc, PAGE_ALIGN(sizeof(*blob)));
-	if (IS_ERR(vma))
-		return PTR_ERR(vma);
-
-	guc->ads_vma = vma;
 
 	blob = i915_gem_object_pin_map(guc->ads_vma->obj, I915_MAP_WB);
-	if (IS_ERR(blob)) {
-		ret = PTR_ERR(blob);
-		goto err_vma;
-	}
+	if (IS_ERR(blob))
+		return PTR_ERR(blob);
 
 	/* GuC scheduling policies */
 	guc_policies_init(&blob->policies);
@@ -143,7 +128,7 @@ int intel_guc_ads_create(struct intel_guc *guc)
 	blob->system_info.vebox_enable_mask = VEBOX_MASK(dev_priv);
 	blob->system_info.vdbox_sfc_support_mask = RUNTIME_INFO(dev_priv)->vdbox_sfc_access;
 
-	base = intel_guc_ggtt_offset(guc, vma);
+	base = intel_guc_ggtt_offset(guc, guc->ads_vma);
 
 	/* Clients info  */
 	guc_ct_pool_entries_init(blob->ct_pool, ARRAY_SIZE(blob->ct_pool));
@@ -162,6 +147,34 @@ int intel_guc_ads_create(struct intel_guc *guc)
 	i915_gem_object_unpin_map(guc->ads_vma->obj);
 
 	return 0;
+}
+
+/**
+ * intel_guc_ads_create() - allocates and initializes GuC ADS.
+ * @guc: intel_guc struct
+ *
+ * GuC needs memory block (Additional Data Struct), where it will store
+ * some data. Allocate and initialize such memory block for GuC use.
+ */
+int intel_guc_ads_create(struct intel_guc *guc)
+{
+	const u32 size = PAGE_ALIGN(sizeof(struct __guc_ads_blob));
+	struct i915_vma *vma;
+	int ret;
+
+	GEM_BUG_ON(guc->ads_vma);
+
+	vma = intel_guc_allocate_vma(guc, size);
+	if (IS_ERR(vma))
+		return PTR_ERR(vma);
+
+	guc->ads_vma = vma;
+
+	ret = __guc_ads_init(guc);
+	if (ret)
+		goto err_vma;
+
+	return 0;
 
 err_vma:
 	i915_vma_unpin_and_release(&guc->ads_vma, 0);
@@ -172,3 +185,18 @@ void intel_guc_ads_destroy(struct intel_guc *guc)
 {
 	i915_vma_unpin_and_release(&guc->ads_vma, 0);
 }
+
+/**
+ * intel_guc_ads_reset() - prepares GuC Additional Data Struct for reuse
+ * @guc: intel_guc struct
+ *
+ * GuC stores some data in ADS, which might be stale after a reset.
+ * Reinitialize whole ADS in case any part of it was corrupted during
+ * previous GuC run.
+ */
+void intel_guc_ads_reset(struct intel_guc *guc)
+{
+	if (!guc->ads_vma)
+		return;
+	__guc_ads_init(guc);
+}

drivers/gpu/drm/i915/intel_guc_ads.h

@@ -29,5 +29,6 @@ struct intel_guc;
 
 int intel_guc_ads_create(struct intel_guc *guc);
 void intel_guc_ads_destroy(struct intel_guc *guc);
+void intel_guc_ads_reset(struct intel_guc *guc);
 
 #endif

drivers/gpu/drm/i915/intel_uc.c

@@ -24,8 +24,9 @@
 
 #include "gt/intel_reset.h"
 #include "intel_uc.h"
-#include "intel_guc_submission.h"
 #include "intel_guc.h"
+#include "intel_guc_ads.h"
+#include "intel_guc_submission.h"
 #include "i915_drv.h"
 
 static void guc_free_load_err_log(struct intel_guc *guc);
@@ -414,6 +415,7 @@ int intel_uc_init_hw(struct drm_i915_private *i915)
 				goto err_out;
 		}
 
+		intel_guc_ads_reset(guc);
 		intel_guc_init_params(guc);
 		ret = intel_guc_fw_upload(guc);
 		if (ret == 0)