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drm/i915: New lock to serialize the Host2GuC actions

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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)

v3: To conform to the general rules, acquire mutex before taking the
    forcewake. (Tvrtko)

Signed-off-by: Akash Goel <akash.goel@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
This commit is contained in:
Akash Goel 2016-10-12 21:54:35 +05:30 committed by Tvrtko Ursulin
parent f824083559
commit 5dd7989bbd
2 changed files with 6 additions and 0 deletions
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3
drivers/gpu/drm/i915/i915_guc_submission.c
View File

@ -87,6 +87,7 @@ static int host2guc_action(struct intel_guc *guc, u32 *data, u32 len)
if (WARN_ON(len < 1 || len > 15))
return -EINVAL;
mutex_lock(&guc->action_lock);
intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
dev_priv->guc.action_count += 1;
@ -125,6 +126,7 @@ static int host2guc_action(struct intel_guc *guc, u32 *data, u32 len)
dev_priv->guc.action_status = status;
intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
mutex_unlock(&guc->action_lock);
return ret;
}
@ -1366,6 +1368,7 @@ int i915_guc_submission_init(struct drm_i915_private *dev_priv)
guc->ctx_pool_vma = vma;
ida_init(&guc->ctx_ids);
mutex_init(&guc->action_lock);
guc_log_create(guc);
guc_addon_create(guc);

3
drivers/gpu/drm/i915/intel_guc.h
View File

@ -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 */