Re: [PATCH 7/8] drm/i915/huc: Support HuC authentication

[Arkadiusz Hiler <arkadiusz.hiler@intel.com>]

On Thu, Dec 08, 2016 at 03:02:18PM -0800, anushasr wrote:
> From: Peter Antoine <peter.antoine@intel.com>
> 
> The HuC authentication is done by host2guc call. The HuC RSA keys
> are sent to GuC for authentication.
> 
> v2: rebased on top of drm-intel-nightly.
>     changed name format and upped version 1.7.
> v3: rebased on top of drm-intel-nightly.
> v4: changed wait_for_automic to wait_for
> v5: rebased.
> v7: rebased.
> v8: rebased.
> v9: rebased. Rename intel_huc_auh() to intel_guc_auth_huc()
> and place the prototype in intel_guc.h,correct the comments.
> v10: rebased.
> v11: rebased.
> v12: rebased on top of drm-tip
> v13: rebased. Moved intel_guc_auth_huc from i915_guc_submission.c
> to intel_uc.c.Update dev to dev_priv in intel_guc_auth_huc().
> Renamed HOST2GUC_ACTION_AUTHENTICATE_HUC TO INTEL_GUC_ACTION_
> AUTHENTICATE_HUC
> 
> Tested-by: Xiang Haihao <haihao.xiang@intel.com>
> Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> Signed-off-by: Alex Dai <yu.dai@intel.com>
> Signed-off-by: Peter Antoine <peter.antoine@intel.com>
Reviewed-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_guc_fwif.h   |  1 +
>  drivers/gpu/drm/i915/intel_guc_loader.c |  2 ++
>  drivers/gpu/drm/i915/intel_uc.c         | 61 +++++++++++++++++++++++++++++++++
>  drivers/gpu/drm/i915/intel_uc.h         |  1 +
>  4 files changed, 65 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_guc_fwif.h b/drivers/gpu/drm/i915/intel_guc_fwif.h
> index c1e7faf..94a974d 100644
> --- a/drivers/gpu/drm/i915/intel_guc_fwif.h
> +++ b/drivers/gpu/drm/i915/intel_guc_fwif.h
> @@ -504,6 +504,7 @@ enum intel_guc_action {
>  	INTEL_GUC_ACTION_EXIT_S_STATE = 0x502,
>  	INTEL_GUC_ACTION_SLPC_REQUEST = 0x3003,
>  	INTEL_GUC_ACTION_UK_LOG_ENABLE_LOGGING = 0x0E000,
> +	INTEL_GUC_ACTION_AUTHENTICATE_HUC = 0x4000,
>  	INTEL_GUC_ACTION_LIMIT
>  };
>  
> diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
> index b971351..89d092b 100644
> --- a/drivers/gpu/drm/i915/intel_guc_loader.c
> +++ b/drivers/gpu/drm/i915/intel_guc_loader.c
> @@ -529,6 +529,8 @@ int intel_guc_setup(struct drm_i915_private *dev_priv)
>  		intel_uc_fw_status_repr(guc_fw->fetch_status),
>  		intel_uc_fw_status_repr(guc_fw->load_status));
>  
> +	intel_guc_auth_huc(dev_priv);
> +
>  	if (i915.enable_guc_submission) {
>  		if (i915.guc_log_level >= 0)
>  			gen9_enable_guc_interrupts(dev_priv);
> diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
> index 8ae6795..445b9ad 100644
> --- a/drivers/gpu/drm/i915/intel_uc.c
> +++ b/drivers/gpu/drm/i915/intel_uc.c
> @@ -138,3 +138,64 @@ int intel_guc_log_control(struct intel_guc *guc, u32 control_val)
>  
>  	return intel_guc_send(guc, action, ARRAY_SIZE(action));
>  }
> +
> +/**
> + * intel_guc_auth_huc() - authenticate ucode
> + * @dev: the drm device
> + *
> + * Triggers a HuC fw authentication request to the GuC via host-2-guc
> + * interface.
> + */
> +void intel_guc_auth_huc(struct drm_i915_private *dev_priv)
> +{
> +	struct intel_guc *guc = &dev_priv->guc;
> +	struct intel_huc *huc = &dev_priv->huc;
> +	struct i915_vma *vma;
> +	int ret;
> +	u32 data[2];
> +
> +	/* Bypass the case where there is no HuC firmware */
> +	if (huc->huc_fw.fetch_status == UC_FIRMWARE_NONE ||
> +		huc->huc_fw.load_status == UC_FIRMWARE_NONE)
> +		return;
> +
> +	if (guc->guc_fw.load_status != UC_FIRMWARE_SUCCESS) {
> +		DRM_ERROR("HuC: GuC fw wasn't loaded. Can't authenticate");
> +		return;
> +	}
> +
> +	if (huc->huc_fw.load_status != UC_FIRMWARE_SUCCESS) {
> +		DRM_ERROR("HuC: fw wasn't loaded. Nothing to authenticate");
> +		return;
> +	}
> +
> +	vma = i915_gem_object_ggtt_pin(huc->huc_fw.uc_fw_obj, NULL, 0, 0, 0);
> +	if (IS_ERR(vma)) {
> +		DRM_DEBUG_DRIVER("pin failed %d\n", (int)PTR_ERR(vma));
> +		return;
> +	}
> +
> +
> +	/* Invalidate GuC TLB to let GuC take the latest updates to GTT. */
> +	I915_WRITE(GEN8_GTCR, GEN8_GTCR_INVALIDATE);
> +
> +	/* Specify auth action and where public signature is. */
> +	data[0] = INTEL_GUC_ACTION_AUTHENTICATE_HUC;
> +	data[1] = i915_ggtt_offset(vma) + huc->huc_fw.rsa_offset;
> +
> +	ret = intel_guc_send(guc, data, ARRAY_SIZE(data));
> +	if (ret) {
> +		DRM_ERROR("HuC: GuC did not ack Auth request\n");
> +		goto out;
> +	}
> +
> +	/* Check authentication status, it should be done by now */
> +	ret = wait_for((I915_READ(HUC_STATUS2) & HUC_FW_VERIFIED) > 0, 50);
> +	if (ret) {
> +		DRM_ERROR("HuC: Authentication failed\n");
> +		goto out;
> +	}
> +
> +out:
> +	i915_vma_unpin(vma);
> +}
> diff --git a/drivers/gpu/drm/i915/intel_uc.h b/drivers/gpu/drm/i915/intel_uc.h
> index ac92946..1db8bc2 100644
> --- a/drivers/gpu/drm/i915/intel_uc.h
> +++ b/drivers/gpu/drm/i915/intel_uc.h
> @@ -196,6 +196,7 @@ int intel_guc_sample_forcewake(struct intel_guc *guc);
>  int intel_guc_log_flush_complete(struct intel_guc *guc);
>  int intel_guc_log_flush(struct intel_guc *guc);
>  int intel_guc_log_control(struct intel_guc *guc, u32 control_val);
> +void intel_guc_auth_huc(struct drm_i915_private *dev_priv);
>  
>  /* intel_guc_loader.c */
>  extern void intel_guc_init(struct drm_i915_private *dev_priv);
> -- 
> 2.7.4
> 
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-- 
Cheers,
Arek
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