On Fri, Jan 13, 2017 at 09:07:08AM -0800, Anusha Srivatsa wrote:
> +/**
> + * intel_guc_auth_huc() - authenticate ucode
> + * @dev_priv: the drm_i915_device
> + *
> + * Triggers a HuC fw authentication request to the GuC via intel_guc_action_
> + * authenticate_huc 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];
> +
> +     vma = i915_gem_object_ggtt_pin(huc->fw.obj, NULL, 0, 0,
> +                             PIN_OFFSET_BIAS | GUC_WOPCM_TOP);
> +     if (IS_ERR(vma)) {
> +             DRM_ERROR("failed to pin huc fw object %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->fw.rsa_offset;
> +
> +     ret = intel_guc_send(guc, data, ARRAY_SIZE(data));
> +     if (ret) {
> +             DRM_ERROR("HuC: GuC did not ack Auth request %d\n", ret);
> +             goto out;
> +     }
> +
> +     /* Check authentication status, it should be done by now */
> +     ret = intel_wait_for_register(dev_priv,
> +                             HUC_STATUS2,
> +                             HUC_FW_VERIFIED,
> +                             HUC_FW_VERIFIED,
> +                             50);
> +
> +     if (ret) {
> +             DRM_ERROR("HuC: Authentication failed %d\n", ret);
> +             goto out;
> +     }
> +
> +     DRM_ERROR("HuC Authentication Successful!\n");

Probably don't want to proclaim using the HuC as an error ;-)
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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