[Intel-gfx] [PATCH v8 15/20] drm/i915: Watchdog timeout: Pass GuC shared data structure during param load

[Michel Thierry]

For watchdog / media reset, the firmware must know the address of the shared
data page (the first page of the default context).

This information should be in DWORD 9 of the GUC_CTL structure.

v2: Use guc_ggtt_offset (Chris).
Store the ggtt offset of the default ctx as we needed for
suspend/resume/reset (Daniele).

Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Signed-off-by: Michel Thierry <michel.thierry at intel.com>
---
 drivers/gpu/drm/i915/i915_guc_submission.c | 21 ++++++---------------
 drivers/gpu/drm/i915/intel_guc_fwif.h      |  2 +-
 drivers/gpu/drm/i915/intel_guc_loader.c    | 11 +++++++++++
 drivers/gpu/drm/i915/intel_uc.h            |  2 ++
 4 files changed, 20 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index 66bf521e5007..80da01a907cf 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -1387,7 +1387,6 @@ void i915_guc_submission_reenable_engine(struct intel_engine_cs *engine)
 int intel_guc_suspend(struct drm_i915_private *dev_priv)
 {
 	struct intel_guc *guc = &dev_priv->guc;
-	struct i915_gem_context *ctx;
 	u32 data[3];
 
 	if (guc->fw.load_status != INTEL_UC_FIRMWARE_SUCCESS)
@@ -1395,13 +1394,11 @@ int intel_guc_suspend(struct drm_i915_private *dev_priv)
 
 	gen9_disable_guc_interrupts(dev_priv);
 
-	ctx = dev_priv->kernel_context;
-
 	data[0] = INTEL_GUC_ACTION_ENTER_S_STATE;
 	/* any value greater than GUC_POWER_D0 */
 	data[1] = GUC_POWER_D1;
-	/* first page is shared data with GuC */
-	data[2] = guc_ggtt_offset(ctx->engine[RCS].state);
+	/* first page of default ctx is shared data with GuC */
+	data[2] = guc->shared_data_offset;
 
 	return intel_guc_send(guc, data, ARRAY_SIZE(data));
 }
@@ -1413,7 +1410,6 @@ int intel_guc_suspend(struct drm_i915_private *dev_priv)
 int intel_guc_resume(struct drm_i915_private *dev_priv)
 {
 	struct intel_guc *guc = &dev_priv->guc;
-	struct i915_gem_context *ctx;
 	u32 data[3];
 
 	if (guc->fw.load_status != INTEL_UC_FIRMWARE_SUCCESS)
@@ -1422,12 +1418,10 @@ int intel_guc_resume(struct drm_i915_private *dev_priv)
 	if (i915.guc_log_level >= 0)
 		gen9_enable_guc_interrupts(dev_priv);
 
-	ctx = dev_priv->kernel_context;
-
 	data[0] = INTEL_GUC_ACTION_EXIT_S_STATE;
 	data[1] = GUC_POWER_D0;
-	/* first page is shared data with GuC */
-	data[2] = guc_ggtt_offset(ctx->engine[RCS].state);
+	/* first page of default ctx is shared data with GuC */
+	data[2] = guc->shared_data_offset;
 
 	return intel_guc_send(guc, data, ARRAY_SIZE(data));
 }
@@ -1436,14 +1430,11 @@ int i915_guc_reset_engine(struct intel_engine_cs *engine)
 {
 	struct drm_i915_private *dev_priv = engine->i915;
 	struct intel_guc *guc = &dev_priv->guc;
-	struct i915_gem_context *ctx;
 	u32 data[7];
 
 	if (!i915.enable_guc_submission)
 		return 0;
 
-	ctx = dev_priv->kernel_context;
-
 	/*
 	 * The affected context report is populated by GuC and is provided
 	 * to the driver using the shared page. We request for it but don't
@@ -1455,8 +1446,8 @@ int i915_guc_reset_engine(struct intel_engine_cs *engine)
 	data[3] = 0;
 	data[4] = 0;
 	data[5] = guc->execbuf_client->stage_id;
-	/* first page is shared data with GuC */
-	data[6] = guc_ggtt_offset(ctx->engine[RCS].state);
+	/* first page of default ctx is shared data with GuC */
+	data[6] = guc->shared_data_offset;
 
 	return intel_guc_send(guc, data, ARRAY_SIZE(data));
 }
diff --git a/drivers/gpu/drm/i915/intel_guc_fwif.h b/drivers/gpu/drm/i915/intel_guc_fwif.h
index 081f2cf614e6..a2d0cba2f8b9 100644
--- a/drivers/gpu/drm/i915/intel_guc_fwif.h
+++ b/drivers/gpu/drm/i915/intel_guc_fwif.h
@@ -135,7 +135,7 @@
 #define   GUC_ADS_ADDR_SHIFT		11
 #define   GUC_ADS_ADDR_MASK		0xfffff800
 
-#define GUC_CTL_RSRVD			9
+#define GUC_CTL_SHARED_DATA		9
 
 #define GUC_CTL_MAX_DWORDS		(SOFT_SCRATCH_COUNT - 2) /* [1..14] */
 
diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
index d9045b6e897b..8cd5c2bf9510 100644
--- a/drivers/gpu/drm/i915/intel_guc_loader.c
+++ b/drivers/gpu/drm/i915/intel_guc_loader.c
@@ -108,6 +108,7 @@ static void guc_params_init(struct drm_i915_private *dev_priv)
 {
 	struct intel_guc *guc = &dev_priv->guc;
 	u32 params[GUC_CTL_MAX_DWORDS];
+	struct i915_gem_context *ctx;
 	int i;
 
 	memset(&params, 0, sizeof(params));
@@ -156,6 +157,16 @@ static void guc_params_init(struct drm_i915_private *dev_priv)
 		params[GUC_CTL_FEATURE] &= ~GUC_CTL_DISABLE_SCHEDULER;
 	}
 
+	/*
+	 * For watchdog / media reset, GuC must know the address of the shared
+	 * data page, which is the first page of the default context.
+	 * We will also use this page in several places (suspend/resume/reset),
+	 * so save the ggtt offset.
+	 */
+	ctx = dev_priv->kernel_context;
+	guc->shared_data_offset = guc_ggtt_offset(ctx->engine[RCS].state);
+	params[GUC_CTL_SHARED_DATA] = guc->shared_data_offset;
+
 	I915_WRITE(SOFT_SCRATCH(0), 0);
 
 	for (i = 0; i < GUC_CTL_MAX_DWORDS; i++)
diff --git a/drivers/gpu/drm/i915/intel_uc.h b/drivers/gpu/drm/i915/intel_uc.h
index 6323d002664d..e945e2231bbe 100644
--- a/drivers/gpu/drm/i915/intel_uc.h
+++ b/drivers/gpu/drm/i915/intel_uc.h
@@ -187,6 +187,8 @@ struct intel_guc {
 	DECLARE_BITMAP(doorbell_bitmap, GUC_NUM_DOORBELLS);
 	uint32_t db_cacheline;		/* Cyclic counter mod pagesize	*/
 
+	uint32_t shared_data_offset;	/* First page of default ctx */
+
 	/* GuC's FW specific registers used in MMIO send */
 	struct {
 		u32 base;
-- 
2.11.0