[PATCH 08/20] drm/i915: New lock to serialize the Host2GuC actions

[akash.goel at intel.com]

From: Akash Goel <akash.goel at intel.com>

With the addition of new Host2GuC actions related to GuC logging, there
is a need of a lock to serialize them, as they can execute concurrently
with each other and also with other existing actions.

v2: Use mutex in place of spinlock to serialize, as sleep can happen
    while waiting for the action's response from GuC. (Tvrtko)

Signed-off-by: Akash Goel <akash.goel at intel.com>
---
 drivers/gpu/drm/i915/i915_guc_submission.c | 3 +++
 drivers/gpu/drm/i915/intel_guc.h           | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index 3d2535d..af87b3f 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -88,6 +88,7 @@ static int host2guc_action(struct intel_guc *guc, u32 *data, u32 len)
 		return -EINVAL;
 
 	intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
+	mutex_lock(&guc->action_lock);
 
 	dev_priv->guc.action_count += 1;
 	dev_priv->guc.action_cmd = data[0];
@@ -126,6 +127,7 @@ static int host2guc_action(struct intel_guc *guc, u32 *data, u32 len)
 	}
 	dev_priv->guc.action_status = status;
 
+	mutex_unlock(&guc->action_lock);
 	intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
 
 	return ret;
@@ -1295,6 +1297,7 @@ int i915_guc_submission_init(struct drm_i915_private *dev_priv)
 		return -ENOMEM;
 
 	ida_init(&guc->ctx_ids);
+	mutex_init(&guc->action_lock);
 	guc_create_log(guc);
 	guc_create_ads(guc);
 
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index dcc856c..5883b88 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -157,6 +157,9 @@ struct intel_guc {
 
 	uint64_t submissions[I915_NUM_ENGINES];
 	uint32_t last_seqno[I915_NUM_ENGINES];
+
+	/* To serialize the Host2GuC actions */
+	struct mutex action_lock;
 };
 
 /* intel_guc_loader.c */
-- 
1.9.2