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

[Arkadiusz Hiler]

On Thu, Dec 15, 2016 at 10:42:53PM +0000, Chris Wilson wrote:
> On Thu, Dec 15, 2016 at 02:29:50PM -0800, anushasr wrote:
> > 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 on top of drm-tip.
> > v6: rebased. Removed any reference to intel_huc.h
> > v7: 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.
> > 
> > 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         | 4 ++++
> >  drivers/gpu/drm/i915/intel_huc_loader.c | 1 -
> >  include/uapi/drm/i915_drm.h             | 1 +
> >  3 files changed, 5 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> > index 85a47c2..0bc016d 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 +316,9 @@ static int i915_getparam(struct drm_device *dev, void *data,
> >  	case I915_PARAM_MIN_EU_IN_POOL:
> >  		value = INTEL_INFO(dev_priv)->sseu.min_eu_in_pool;
> >  		break;
> > +	case I915_PARAM_HUC_STATUS:
> > +		value = I915_READ(HUC_STATUS2) & HUC_FW_VERIFIED;
> 
> Same question as last time: does the device need to be awake? We know is
> one of the GT power wells, so presumably we need an rpm_get/rpm_put as
> well to access the register.
> -Chris

I get:

[ 1588.570174] [drm:i915_huc_load_status_info [i915]] HUC_STATUS2 PRE  24704
[ 1588.571285] [drm:intel_runtime_suspend [i915]] Suspending device
[ 1588.575768] [drm:intel_runtime_suspend [i915]] Device suspended
[ 1588.577156] [drm:i915_huc_load_status_info [i915]] HUC_STATUS2 POST 24704
[ 1588.578259] [drm:intel_runtime_resume [i915]] Resuming device

consistently from:

value = I915_READ(HUC_STATUS2);
DRM_DEBUG_DRIVER("HUC_STATUS2 PRE  %d\n", value);
i915_pm_ops.runtime_suspend(dev_priv->drm.dev);

value = I915_READ(HUC_STATUS2);
DRM_DEBUG_DRIVER("HUC_STATUS2 POST %d\n", value);
i915_pm_ops.runtime_resume(dev_priv->drm.dev);


> -- 
> Chris Wilson, Intel Open Source Technology Centre
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> Intel-gfx at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Cheers,
Arek