On 12/08/16 07:25, akash.goel@xxxxxxxxx wrote:
From: Akash Goel <akash.goel@xxxxxxxxx>
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@xxxxxxxxx>
---
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 1a2d648..cb9672b 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);
I would probably take the mutex before grabbing forcewake as a general
rule. Not that I think it matters in this case since we don't expect any
contention on this one.
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;
@@ -1312,6 +1314,7 @@ 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 96ef7dc..e4ec8d8 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -156,6 +156,9 @@ 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 */
With or without the mutex vs forcewake ordering change:
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Regards,
Tvrtko
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