Re: [PATCH 8/8] drm/i915/get_params: Add HuC status to getparams

From: Michal Wajdeczko <michal.wajdeczko@linux.intel.com>
To: anushasr <anusha.srivatsa@intel.com>
Cc: intel-gfx@lists.freedesktop.org, Peter Antoine <peter.antoine@intel.com>
Subject: Re: [PATCH 8/8] drm/i915/get_params: Add HuC status to getparams
Date: Fri, 9 Dec 2016 13:59:45 +0100	[thread overview]
Message-ID: <20161209125945.GE45868@mwajdecz-MOBL1.ger.corp.intel.com> (raw)
In-Reply-To: <1481238139-9509-9-git-send-email-anusha.srivatsa@intel.com>

On Thu, Dec 08, 2016 at 03:02:19PM -0800, anushasr wrote:
> From: Peter Antoine <peter.antoine@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
> 
> Signed-off-by: Peter Antoine <peter.antoine@intel.com>
> Reviewed-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_drv.c         |  4 ++++
>  drivers/gpu/drm/i915/intel_huc_loader.c | 12 ++++++++++++
>  drivers/gpu/drm/i915/intel_uc.h         |  1 +
>  include/uapi/drm/i915_drm.h             |  1 +
>  4 files changed, 18 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 85a47c2..6be06a27 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;
>  
> @@ -349,6 +350,9 @@ static int i915_getparam(struct drm_device *dev, void *data,
>  		 */
>  		value = 1;
>  		break;
> +	case I915_PARAM_HAS_HUC:

For me this param name does not match returned result which maybe misleading.
Note that other HAS params return static driver/hw capability, not runtime.

I guess PARAM_HUC_STATUS would be better (0=no huc, 1=pending, 2=ok, -1=failed)
And you can cache huc status in intel_huc struct and make final modification in
intel_huc_auth() function to avoid registry read (unless we want to detect later
crash of the huc using this reg read)

> +		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_loader.c b/drivers/gpu/drm/i915/intel_huc_loader.c
> index 96fc727..6704cc8 100644
> --- a/drivers/gpu/drm/i915/intel_huc_loader.c
> +++ b/drivers/gpu/drm/i915/intel_huc_loader.c
> @@ -289,3 +289,15 @@ 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

Please change function return type to bool to match this description.

> + * 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/drivers/gpu/drm/i915/intel_uc.h b/drivers/gpu/drm/i915/intel_uc.h
> index 1db8bc2..ccd3f69 100644
> --- a/drivers/gpu/drm/i915/intel_uc.h
> +++ b/drivers/gpu/drm/i915/intel_uc.h
> @@ -226,6 +226,7 @@ int i915_guc_log_control(struct drm_i915_private *dev_priv, u64 control_val);
>  void intel_huc_init(struct drm_i915_private *dev_priv);
>  void intel_huc_fini(struct drm_device *dev);
>  int intel_huc_load(struct drm_i915_private *dev_priv);
> +int intel_is_huc_valid(struct drm_i915_private *dev_priv);
>  
>  #endif
>  #endif
> diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
> index da32c2f..3e1964c 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_HAS_HUC		 42
>  
>  typedef struct drm_i915_getparam {
>  	__s32 param;
> -- 
> 2.7.4
> 
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