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/*
* Copyright © 2016-2017 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
*/
#include <linux/types.h>
#include "intel_huc.h"
#include "i915_drv.h"
void intel_huc_init_early(struct intel_huc *huc)
{
intel_huc_fw_init_early(huc);
}
/**
* intel_huc_auth() - Authenticate HuC uCode
* @huc: intel_huc structure
*
* Called after HuC and GuC firmware loading during intel_uc_init_hw().
*
* This function pins HuC firmware image object into GGTT.
* Then it invokes GuC action to authenticate passing the offset to RSA
* signature through intel_guc_auth_huc(). It then waits for 50ms for
* firmware verification ACK and unpins the object.
*/
int intel_huc_auth(struct intel_huc *huc)
{
struct drm_i915_private *i915 = huc_to_i915(huc);
struct intel_guc *guc = &i915->guc;
struct i915_vma *vma;
u32 status;
int ret;
if (huc->fw.load_status != INTEL_UC_FIRMWARE_SUCCESS)
return -ENOEXEC;
vma = i915_gem_object_ggtt_pin(huc->fw.obj, NULL, 0, 0,
PIN_OFFSET_BIAS | guc->ggtt_pin_bias);
if (IS_ERR(vma)) {
ret = PTR_ERR(vma);
DRM_ERROR("HuC: Failed to pin huc fw object %d\n", ret);
goto fail;
}
ret = intel_guc_auth_huc(guc,
intel_guc_ggtt_offset(guc, vma) +
huc->fw.rsa_offset);
if (ret) {
DRM_ERROR("HuC: GuC did not ack Auth request %d\n", ret);
goto fail_unpin;
}
/* Check authentication status, it should be done by now */
ret = __intel_wait_for_register(i915,
HUC_STATUS2,
HUC_FW_VERIFIED,
HUC_FW_VERIFIED,
2, 50, &status);
if (ret) {
DRM_ERROR("HuC: Firmware not verified %#x\n", status);
goto fail_unpin;
}
i915_vma_unpin(vma);
return 0;
fail_unpin:
i915_vma_unpin(vma);
fail:
huc->fw.load_status = INTEL_UC_FIRMWARE_FAIL;
DRM_ERROR("HuC: Authentication failed %d\n", ret);
return ret;
}
/**
* intel_huc_check_status() - check HuC status
* @huc: intel_huc structure
*
* This function reads status register to verify if HuC
* firmware was successfully loaded.
*
* Returns positive value if HuC firmware is loaded and verified
* and -ENODEV if HuC is not present.
*/
int intel_huc_check_status(struct intel_huc *huc)
{
struct drm_i915_private *dev_priv = huc_to_i915(huc);
u32 status;
if (!HAS_HUC(dev_priv))
return -ENODEV;
intel_runtime_pm_get(dev_priv);
status = I915_READ(HUC_STATUS2) & HUC_FW_VERIFIED;
intel_runtime_pm_put(dev_priv);
return status;
}
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