[Intel-gfx] [PATCH 7/7] drm/i915/get_params: Add HuC status to getparams

[Anusha Srivatsa]

From: Peter Antoine <peter.antoine at intel.com>

This patch will allow for getparams to return the status of the HuC.
As the HuC has to be validated by the GuC this patch uses the validated
status to show when the HuC is loaded and ready for use. You cannot use
the loaded status as with the GuC as the HuC is verified after it is
loaded and is not usable until it is verified.

v2: removed the forewakes as the registers are already force-woken.
     (T.Ursulin)
v4: rebased.
v5: rebased.
v6: rebased.

Tested-by: Xiang Haihao <haihao.xiang at intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa at intel.com>
Signed-off-by: Peter Antoine <peter.antoine at intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c         |  5 +++++
 drivers/gpu/drm/i915/intel_huc.h        |  1 +
 drivers/gpu/drm/i915/intel_huc_loader.c | 14 ++++++++++++++
 include/uapi/drm/i915_drm.h             |  1 +
 4 files changed, 21 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 2f36672..038ed8d 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -49,6 +49,8 @@
 #include "i915_trace.h"
 #include "i915_vgpu.h"
 #include "intel_drv.h"
+#include "intel_guc.h"
+#include "intel_huc.h"
 
 static struct drm_driver driver;
 
@@ -346,6 +348,9 @@ static int i915_getparam(struct drm_device *dev, void *data,
 		 */
 		value = 1;
 		break;
+	case I915_PARAM_HAS_HUC:
+		value = intel_is_huc_valid(dev_priv);
+		break;
 	default:
 		DRM_DEBUG("Unknown parameter %d\n", param->param);
 		return -EINVAL;
diff --git a/drivers/gpu/drm/i915/intel_huc.h b/drivers/gpu/drm/i915/intel_huc.h
index 3ce0299..2e150be 100644
--- a/drivers/gpu/drm/i915/intel_huc.h
+++ b/drivers/gpu/drm/i915/intel_huc.h
@@ -39,4 +39,5 @@ struct intel_huc {
 void intel_huc_init(struct drm_device *dev);
 void intel_huc_fini(struct drm_device *dev);
 int intel_huc_load(struct drm_device *dev);
+extern int intel_is_huc_valid(struct drm_i915_private *dev_priv);
 #endif
diff --git a/drivers/gpu/drm/i915/intel_huc_loader.c b/drivers/gpu/drm/i915/intel_huc_loader.c
index 0969bdf..2f5d9d9 100644
--- a/drivers/gpu/drm/i915/intel_huc_loader.c
+++ b/drivers/gpu/drm/i915/intel_huc_loader.c
@@ -265,3 +265,17 @@ void intel_huc_fini(struct drm_device *dev)
 
 	huc_fw->fetch_status = UC_FIRMWARE_NONE;
 }
+
+/**
+ * intel_is_huc_valid() - Check to see if the HuC is fully loaded.
+ * @dev_priv:	drm device to check.
+ *
+ * This function will return true if the guc has been loaded and
+ * has valid firmware. The simplest way of doing this is to check
+ * if the HuC has been validated, if so it must have been loaded.
+ */
+int intel_is_huc_valid(struct drm_i915_private *dev_priv)
+{
+	return ((I915_READ(HUC_STATUS2) & HUC_FW_VERIFIED) != 0);
+}
+
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 03725fe..aa7667e 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -388,6 +388,7 @@ typedef struct drm_i915_irq_wait {
 #define I915_PARAM_HAS_POOLED_EU	 38
 #define I915_PARAM_MIN_EU_IN_POOL	 39
 #define I915_PARAM_MMAP_GTT_VERSION	 40
+#define I915_PARAM_HAS_HUC		 42
 
 typedef struct drm_i915_getparam {
 	__s32 param;
-- 
2.7.4