[Intel-gfx] [PATCH v3 1/5] drm/i915/guc: Fix GuC pin bias and WOPCM initialization order

[Jakub Bartmiński]

It would seem that we are using uninitialized WOPCM variables when
setting the GuC pin bias. The pin bias has to be set after the WOPCM,
but before the call to i915_gem_contexts_init where the first contexts
are pinned so the safest place to set it seems to be right after
initializing the relevant variables in intel_wopcm_init.

Fixes: f7dc0157e4b5 ("drm/i915/uc: Fetch GuC/HuC firmwares from guc/huc specific init")
Signed-off-by: Jakub Bartmiński <jakub.bartminski at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Michał Winiarski <michal.winiarski at intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
---
 drivers/gpu/drm/i915/intel_guc.c   | 21 ---------------------
 drivers/gpu/drm/i915/intel_wopcm.c | 19 +++++++++++++++++++
 2 files changed, 19 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_guc.c b/drivers/gpu/drm/i915/intel_guc.c
index e12bd259df17..47cacd59ac32 100644
--- a/drivers/gpu/drm/i915/intel_guc.c
+++ b/drivers/gpu/drm/i915/intel_guc.c
@@ -27,8 +27,6 @@
 #include "intel_guc_submission.h"
 #include "i915_drv.h"
 
-static void guc_init_ggtt_pin_bias(struct intel_guc *guc);
-
 static void gen8_guc_raise_irq(struct intel_guc *guc)
 {
 	struct drm_i915_private *dev_priv = guc_to_i915(guc);
@@ -142,8 +140,6 @@ int intel_guc_init_misc(struct intel_guc *guc)
 	struct drm_i915_private *i915 = guc_to_i915(guc);
 	int ret;
 
-	guc_init_ggtt_pin_bias(guc);
-
 	ret = guc_init_wq(guc);
 	if (ret)
 		return ret;
@@ -611,23 +607,6 @@ int intel_guc_resume(struct intel_guc *guc)
  * actual GuC WOPCM size.
  */
 
-/**
- * guc_init_ggtt_pin_bias() - Initialize the GuC ggtt_pin_bias value.
- * @guc: intel_guc structure.
- *
- * This function will calculate and initialize the ggtt_pin_bias value based on
- * overall WOPCM size and GuC WOPCM size.
- */
-static void guc_init_ggtt_pin_bias(struct intel_guc *guc)
-{
-	struct drm_i915_private *i915 = guc_to_i915(guc);
-
-	GEM_BUG_ON(!i915->wopcm.size);
-	GEM_BUG_ON(i915->wopcm.size < i915->wopcm.guc.base);
-
-	guc->ggtt_pin_bias = i915->wopcm.size - i915->wopcm.guc.base;
-}
-
 /**
  * intel_guc_allocate_vma() - Allocate a GGTT VMA for GuC usage
  * @guc:	the guc
diff --git a/drivers/gpu/drm/i915/intel_wopcm.c b/drivers/gpu/drm/i915/intel_wopcm.c
index 74bf76f3fddc..02f602db9548 100644
--- a/drivers/gpu/drm/i915/intel_wopcm.c
+++ b/drivers/gpu/drm/i915/intel_wopcm.c
@@ -140,6 +140,23 @@ static inline int check_hw_restriction(struct drm_i915_private *i915,
 	return err;
 }
 
+/**
+ * wopcm_init_guc_ggtt_pin_bias() - Initialize the GuC ggtt_pin_bias value.
+ * @wopcm: pointer to intel_wopcm.
+ *
+ * This function will calculate and initialize the GuC ggtt_pin_bias value based
+ * on overall WOPCM size and GuC WOPCM size.
+ */
+static void wopcm_init_guc_ggtt_pin_bias(struct intel_wopcm *wopcm)
+{
+	struct drm_i915_private *i915 = wopcm_to_i915(wopcm);
+
+	GEM_BUG_ON(!wopcm->size);
+	GEM_BUG_ON(wopcm->size < wopcm->guc.base);
+
+	i915->guc.ggtt_pin_bias = wopcm->size - wopcm->guc.base;
+}
+
 /**
  * intel_wopcm_init() - Initialize the WOPCM structure.
  * @wopcm: pointer to intel_wopcm.
@@ -207,6 +224,8 @@ int intel_wopcm_init(struct intel_wopcm *wopcm)
 	wopcm->guc.base = guc_wopcm_base;
 	wopcm->guc.size = guc_wopcm_size;
 
+	wopcm_init_guc_ggtt_pin_bias(wopcm);
+
 	return 0;
 }
 
-- 
2.17.1