[Intel-gfx] [PATCH 1/4] drm/i915/huc: check HW directly for HuC auth status

[Daniele Ceraolo Spurio]

The huc_is_authenticated function return is based on our SW tracking of
the HuC auth status. However, around suspend/resume and reset this can
go out of sync with the actual HW state, which is why we use
huc_check_state() to look at the actual HW state. Instead of having this
duality, just make huc_is_authenticated() return the HW state and use it
everywhere we need to know if HuC is running.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
---
 drivers/gpu/drm/i915/gt/uc/intel_huc.c | 23 ++++++++++++++---------
 drivers/gpu/drm/i915/gt/uc/intel_huc.h |  5 -----
 2 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_huc.c b/drivers/gpu/drm/i915/gt/uc/intel_huc.c
index 556829de9c172..773020e69589a 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_huc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_huc.c
@@ -80,6 +80,18 @@ void intel_huc_fini(struct intel_huc *huc)
 	intel_uc_fw_fini(&huc->fw);
 }
 
+static bool huc_is_authenticated(struct intel_huc *huc)
+{
+	struct intel_gt *gt = huc_to_gt(huc);
+	intel_wakeref_t wakeref;
+	u32 status = 0;
+
+	with_intel_runtime_pm(gt->uncore->rpm, wakeref)
+		status = intel_uncore_read(gt->uncore, huc->status.reg);
+
+	return (status & huc->status.mask) == huc->status.value;
+}
+
 /**
  * intel_huc_auth() - Authenticate HuC uCode
  * @huc: intel_huc structure
@@ -96,7 +108,7 @@ int intel_huc_auth(struct intel_huc *huc)
 	struct intel_guc *guc = &gt->uc.guc;
 	int ret;
 
-	GEM_BUG_ON(intel_huc_is_authenticated(huc));
+	GEM_BUG_ON(huc_is_authenticated(huc));
 
 	if (!intel_uc_fw_is_loaded(&huc->fw))
 		return -ENOEXEC;
@@ -150,10 +162,6 @@ int intel_huc_auth(struct intel_huc *huc)
  */
 int intel_huc_check_status(struct intel_huc *huc)
 {
-	struct intel_gt *gt = huc_to_gt(huc);
-	intel_wakeref_t wakeref;
-	u32 status = 0;
-
 	switch (__intel_uc_fw_status(&huc->fw)) {
 	case INTEL_UC_FIRMWARE_NOT_SUPPORTED:
 		return -ENODEV;
@@ -167,10 +175,7 @@ int intel_huc_check_status(struct intel_huc *huc)
 		break;
 	}
 
-	with_intel_runtime_pm(gt->uncore->rpm, wakeref)
-		status = intel_uncore_read(gt->uncore, huc->status.reg);
-
-	return (status & huc->status.mask) == huc->status.value;
+	return huc_is_authenticated(huc);
 }
 
 /**
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_huc.h b/drivers/gpu/drm/i915/gt/uc/intel_huc.h
index 73ec670800f2b..77d813840d76c 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_huc.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_huc.h
@@ -50,11 +50,6 @@ static inline bool intel_huc_is_used(struct intel_huc *huc)
 	return intel_uc_fw_is_available(&huc->fw);
 }
 
-static inline bool intel_huc_is_authenticated(struct intel_huc *huc)
-{
-	return intel_uc_fw_is_running(&huc->fw);
-}
-
 void intel_huc_load_status(struct intel_huc *huc, struct drm_printer *p);
 
 #endif
-- 
2.25.1