drm/i915/guc: Add host2guc notification for suspend and resume

Add host2guc interface to notify GuC power state changes when
enter or resume from power saving state.

v3: Move intel_guc_suspend to i915_drm_suspend for consistency.

v2: Add GuC suspend/resume to runtime suspend/resume too

v1: Change to a more flexible way when fill host to GuC scratch
data in order to remove hard coding.
Signed-off-by: Alex Dai <yu.dai@intel.com>
Reviewed-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_drv.c

@@ -638,6 +638,8 @@ static int i915_drm_suspend(struct drm_device *dev)
 		return error;
 	}
 
+	intel_guc_suspend(dev);
+
 	intel_suspend_gt_powersave(dev);
 
 	/*
@@ -767,6 +769,8 @@ static int i915_drm_resume(struct drm_device *dev)
 	}
 	mutex_unlock(&dev->struct_mutex);
 
+	intel_guc_resume(dev);
+
 	intel_modeset_init_hw(dev);
 
 	spin_lock_irq(&dev_priv->irq_lock);
@@ -1500,6 +1504,8 @@ static int intel_runtime_suspend(struct device *device)
 	i915_gem_release_all_mmaps(dev_priv);
 	mutex_unlock(&dev->struct_mutex);
 
+	intel_guc_suspend(dev);
+
 	intel_suspend_gt_powersave(dev);
 	intel_runtime_pm_disable_interrupts(dev_priv);
 
@@ -1559,6 +1565,8 @@ static int intel_runtime_resume(struct device *device)
 	intel_opregion_notify_adapter(dev, PCI_D0);
 	dev_priv->pm.suspended = false;
 
+	intel_guc_resume(dev);
+
 	if (IS_GEN6(dev_priv))
 		intel_init_pch_refclk(dev);
 

drivers/gpu/drm/i915/i915_guc_submission.c

@@ -923,3 +923,53 @@ void i915_guc_submission_fini(struct drm_device *dev)
 	gem_release_guc_obj(guc->ctx_pool_obj);
 	guc->ctx_pool_obj = NULL;
 }
+
+/**
+ * intel_guc_suspend() - notify GuC entering suspend state
+ * @dev:	drm device
+ */
+int intel_guc_suspend(struct drm_device *dev)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_guc *guc = &dev_priv->guc;
+	struct intel_context *ctx;
+	u32 data[3];
+
+	if (!i915.enable_guc_submission)
+		return 0;
+
+	ctx = dev_priv->ring[RCS].default_context;
+
+	data[0] = HOST2GUC_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] = i915_gem_obj_ggtt_offset(ctx->engine[RCS].state);
+
+	return host2guc_action(guc, data, ARRAY_SIZE(data));
+}
+
+
+/**
+ * intel_guc_resume() - notify GuC resuming from suspend state
+ * @dev:	drm device
+ */
+int intel_guc_resume(struct drm_device *dev)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_guc *guc = &dev_priv->guc;
+	struct intel_context *ctx;
+	u32 data[3];
+
+	if (!i915.enable_guc_submission)
+		return 0;
+
+	ctx = dev_priv->ring[RCS].default_context;
+
+	data[0] = HOST2GUC_ACTION_EXIT_S_STATE;
+	data[1] = GUC_POWER_D0;
+	/* first page is shared data with GuC */
+	data[2] = i915_gem_obj_ggtt_offset(ctx->engine[RCS].state);
+
+	return host2guc_action(guc, data, ARRAY_SIZE(data));
+}

drivers/gpu/drm/i915/intel_guc.h

@@ -110,6 +110,8 @@ extern void intel_guc_ucode_init(struct drm_device *dev);
 extern int intel_guc_ucode_load(struct drm_device *dev);
 extern void intel_guc_ucode_fini(struct drm_device *dev);
 extern const char *intel_guc_fw_status_repr(enum intel_guc_fw_status status);
+extern int intel_guc_suspend(struct drm_device *dev);
+extern int intel_guc_resume(struct drm_device *dev);
 
 /* i915_guc_submission.c */
 int i915_guc_submission_init(struct drm_device *dev);

drivers/gpu/drm/i915/intel_guc_fwif.h

@@ -221,12 +221,20 @@ struct guc_context_desc {
 #define GUC_FORCEWAKE_RENDER	(1 << 0)
 #define GUC_FORCEWAKE_MEDIA	(1 << 1)
 
+#define GUC_POWER_UNSPECIFIED	0
+#define GUC_POWER_D0		1
+#define GUC_POWER_D1		2
+#define GUC_POWER_D2		3
+#define GUC_POWER_D3		4
+
 /* This Action will be programmed in C180 - SOFT_SCRATCH_O_REG */
 enum host2guc_action {
 	HOST2GUC_ACTION_DEFAULT = 0x0,
 	HOST2GUC_ACTION_SAMPLE_FORCEWAKE = 0x6,
 	HOST2GUC_ACTION_ALLOCATE_DOORBELL = 0x10,
 	HOST2GUC_ACTION_DEALLOCATE_DOORBELL = 0x20,
+	HOST2GUC_ACTION_ENTER_S_STATE = 0x501,
+	HOST2GUC_ACTION_EXIT_S_STATE = 0x502,
 	HOST2GUC_ACTION_SLPC_REQUEST = 0x3003,
 	HOST2GUC_ACTION_LIMIT
 };

drivers/gpu/drm/i915/intel_guc_loader.c

@@ -383,7 +383,6 @@ int intel_guc_ucode_load(struct drm_device *dev)
 		intel_guc_fw_status_repr(guc_fw->guc_fw_load_status));
 
 	direct_interrupts_to_host(dev_priv);
-	i915_guc_submission_disable(dev);
 
 	if (guc_fw->guc_fw_fetch_status == GUC_FIRMWARE_NONE)
 		return 0;
@@ -433,6 +432,9 @@ int intel_guc_ucode_load(struct drm_device *dev)
 		intel_guc_fw_status_repr(guc_fw->guc_fw_load_status));
 
 	if (i915.enable_guc_submission) {
+		/* The execbuf_client will be recreated. Release it first. */
+		i915_guc_submission_disable(dev);
+
 		err = i915_guc_submission_enable(dev);
 		if (err)
 			goto fail;