[Intel-gfx] [PATCH 8/8] drm/i915/get_params: Add HuC status to getparams

Anusha Srivatsa anusha.srivatsa at intel.com
Fri Jan 13 17:07:17 UTC 2017

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.
v3: rebased on top of drm-tip. Removed any reference to intel_huc.h
v4: rebased. Rename I915_PARAM_HAS_HUC to I915_PARAM_HUC_STATUS.
Remove intel_is_huc_valid() since it is used only in one place.
Put the case of I915_PARAM_HAS_HUC() in the right place.
v5: rebased. Add a comment to specify that I915_READ(reg)
does not read garbage value. The register HUC_STATUS2 is force
woken and no rpm is needed.

Signed-off-by: Anusha Srivatsa <anusha.srivatsa at intel.com>
Signed-off-by: Peter Antoine <peter.antoine at intel.com>
Reviewed-by: Arkadiusz Hiler <arkadiusz.hiler at intel.com>
 drivers/gpu/drm/i915/i915_drv.c | 7 +++++++
 include/uapi/drm/i915_drm.h     | 1 +
 2 files changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index d7a0b49..49a927a 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -49,6 +49,7 @@
 #include "i915_trace.h"
 #include "i915_vgpu.h"
 #include "intel_drv.h"
+#include "intel_uc.h"
 static struct drm_driver driver;
@@ -315,6 +316,12 @@ static int i915_getparam(struct drm_device *dev, void *data,
 		value = INTEL_INFO(dev_priv)->sseu.min_eu_in_pool;
+		/* The register is already force-woken. We dont need
+		 * any rpm here
+		 */
+		break;
 		/* Though we've started our numbering from 1, and so class all
 		 * earlier versions as 0, in effect their value is undefined as
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index da32c2f..57093b4 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -395,6 +395,7 @@ typedef struct drm_i915_irq_wait {
  * priorities and the driver will attempt to execute batches in priority order.
 #define I915_PARAM_HAS_SCHEDULER	 41
+#define I915_PARAM_HUC_STATUS		 42
 typedef struct drm_i915_getparam {
 	__s32 param;

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