Re: [PATCH 5/8] drm/i915/huc: Support HuC authentication

[Jeff McGee <jeff.mcgee@intel.com>]

On Mon, Oct 03, 2016 at 11:42:59AM -0700, Anusha Srivatsa 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.
> 
> 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: Dave Gordon <david.s.gordon@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_guc_submission.c | 65 ++++++++++++++++++++++++++++++
>  drivers/gpu/drm/i915/intel_guc_fwif.h      |  1 +
>  drivers/gpu/drm/i915/intel_guc_loader.c    |  2 +
>  3 files changed, 68 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
> index 4b92943..984b529 100644
> --- a/drivers/gpu/drm/i915/i915_guc_submission.c
> +++ b/drivers/gpu/drm/i915/i915_guc_submission.c
> @@ -25,6 +25,7 @@
>  #include <linux/circ_buf.h>
>  #include "i915_drv.h"
>  #include "intel_guc.h"
> +#include "intel_huc.h"
>  
>  /**
>   * DOC: GuC-based command submission
> @@ -1110,3 +1111,67 @@ int intel_guc_resume(struct drm_device *dev)
>  
>  	return host2guc_action(guc, data, ARRAY_SIZE(data));
>  }
> +
> +/**
> + * intel_huc_auth() - authenticate ucode
> + * @dev: the drm device
> + *
> + * Triggers a HuC fw authentication request to the GuC via host-2-guc
> + * interface.
> + */
> +void intel_huc_auth(struct drm_device *dev)
This function is primarily a guc action and must be in i915_guc_submission.c
to use the static host2guc call. I think it would be clearer to name the
function intel_guc_auth_huc and place the prototype in intel_guc.h instead
of intel_huc.h where other wrappers of host2guc are prototyped.

> +{
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	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. It's stored
> +	 * at the beginning of the gem object, before the fw bits
Second sentence is wrong. RSA offset is after header and ucode. Please
just remove this sentence.

> +	 */
> +	data[0] = HOST2GUC_ACTION_AUTHENTICATE_HUC;
> +	data[1] = i915_ggtt_offset(vma) + huc->huc_fw.rsa_offset;
> +
> +	ret = host2guc_action(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_guc_fwif.h b/drivers/gpu/drm/i915/intel_guc_fwif.h
> index b38b6b4..57e6466 100644
> --- a/drivers/gpu/drm/i915/intel_guc_fwif.h
> +++ b/drivers/gpu/drm/i915/intel_guc_fwif.h
> @@ -438,6 +438,7 @@ enum host2guc_action {
>  	HOST2GUC_ACTION_ENTER_S_STATE = 0x501,
>  	HOST2GUC_ACTION_EXIT_S_STATE = 0x502,
>  	HOST2GUC_ACTION_SLPC_REQUEST = 0x3003,
> +	HOST2GUC_ACTION_AUTHENTICATE_HUC = 0x4000,
>  	HOST2GUC_ACTION_LIMIT
>  };
>  
> diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
> index 0d214b4..31a2b0a 100644
> --- a/drivers/gpu/drm/i915/intel_guc_loader.c
> +++ b/drivers/gpu/drm/i915/intel_guc_loader.c
> @@ -527,6 +527,8 @@ int intel_guc_setup(struct drm_device *dev)
>  		intel_uc_fw_status_repr(guc_fw->fetch_status),
>  		intel_uc_fw_status_repr(guc_fw->load_status));
>  
> +	intel_huc_auth(dev);
> +
>  	if (i915.enable_guc_submission) {
>  		err = i915_guc_submission_enable(dev_priv);
>  		if (err)
> -- 
> 2.7.4
> 
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