On Thu, Dec 22, 2016 at 03:12:23PM -0800, Anusha Srivatsa wrote:
> +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->fw.fetch_status == INTEL_UC_FIRMWARE_NONE ||
> + huc->fw.load_status == INTEL_UC_FIRMWARE_NONE)
> + return;
> +
> + if (guc->fw.load_status != INTEL_UC_FIRMWARE_SUCCESS) {
> + DRM_ERROR("HuC: GuC fw wasn't loaded. Can't authenticate\n");
> + return;
> + }
> +
> + if (huc->fw.load_status != INTEL_UC_FIRMWARE_SUCCESS) {
> + DRM_ERROR("HuC: fw wasn't loaded. Nothing to authenticate\n");
> + return;
> + }
> +
> + vma = i915_gem_object_ggtt_pin(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);
Still working on stopping this from frequently popping up in code
outside of the GTT routines.
> + /* 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\n");
> + goto out;
> + }
> +
> + /* Check authentication status, it should be done by now */
> + ret = wait_for((I915_READ(HUC_STATUS2) & HUC_FW_VERIFIED) > 0, 50);
ret = intel_wait_for_register(dev_priv,
HUC_STATUS2,
HUC_FW_VERIFIED,
HUC_FW_VERIFIED,
50);
wait_for() is a rather large macro, and intel_wait_for_register()
employs the spin then sleep optimisation for quick responses.
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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