drivers/gpu/drm/i915/intel_huc.c

   1 /*
   2  * Copyright © 2016-2017 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  */
  24
  25 #include <linux/types.h>
  26
  27 #include "intel_huc.h"
  28 #include "i915_drv.h"
  29
  30 void intel_huc_init_early(struct intel_huc *huc)
  31 {
  32         intel_huc_fw_init_early(huc);
  33 }
  34
  35 int intel_huc_init_misc(struct intel_huc *huc)
  36 {
  37         struct drm_i915_private *i915 = huc_to_i915(huc);
  38
  39         intel_uc_fw_fetch(i915, &huc->fw);
  40         return 0;
  41 }
  42
  43 /**
  44  * intel_huc_auth() - Authenticate HuC uCode
  45  * @huc: intel_huc structure
  46  *
  47  * Called after HuC and GuC firmware loading during intel_uc_init_hw().
  48  *
  49  * This function pins HuC firmware image object into GGTT.
  50  * Then it invokes GuC action to authenticate passing the offset to RSA
  51  * signature through intel_guc_auth_huc(). It then waits for 50ms for
  52  * firmware verification ACK and unpins the object.
  53  */
  54 int intel_huc_auth(struct intel_huc *huc)
  55 {
  56         struct drm_i915_private *i915 = huc_to_i915(huc);
  57         struct intel_guc *guc = &i915->guc;
  58         struct i915_vma *vma;
  59         u32 status;
  60         int ret;
  61
  62         if (huc->fw.load_status != INTEL_UC_FIRMWARE_SUCCESS)
  63                 return -ENOEXEC;
  64
  65         vma = i915_gem_object_ggtt_pin(huc->fw.obj, NULL, 0, 0,
  66                                        PIN_OFFSET_BIAS | guc->ggtt_pin_bias);
  67         if (IS_ERR(vma)) {
  68                 ret = PTR_ERR(vma);
  69                 DRM_ERROR("HuC: Failed to pin huc fw object %d\n", ret);
  70                 goto fail;
  71         }
  72
  73         ret = intel_guc_auth_huc(guc,
  74                                  intel_guc_ggtt_offset(guc, vma) +
  75                                  huc->fw.rsa_offset);
  76         if (ret) {
  77                 DRM_ERROR("HuC: GuC did not ack Auth request %d\n", ret);
  78                 goto fail_unpin;
  79         }
  80
  81         /* Check authentication status, it should be done by now */
  82         ret = __intel_wait_for_register(i915,
  83                                         HUC_STATUS2,
  84                                         HUC_FW_VERIFIED,
  85                                         HUC_FW_VERIFIED,
  86                                         2, 50, &status);
  87         if (ret) {
  88                 DRM_ERROR("HuC: Firmware not verified %#x\n", status);
  89                 goto fail_unpin;
  90         }
  91
  92         i915_vma_unpin(vma);
  93         return 0;
  94
  95 fail_unpin:
  96         i915_vma_unpin(vma);
  97 fail:
  98         huc->fw.load_status = INTEL_UC_FIRMWARE_FAIL;
  99
 100         DRM_ERROR("HuC: Authentication failed %d\n", ret);
 101         return ret;
 102 }
 103
 104 /**
 105  * intel_huc_check_status() - check HuC status
 106  * @huc: intel_huc structure
 107  *
 108  * This function reads status register to verify if HuC
 109  * firmware was successfully loaded.
 110  *
 111  * Returns positive value if HuC firmware is loaded and verified
 112  * and -ENODEV if HuC is not present.
 113  */
 114 int intel_huc_check_status(struct intel_huc *huc)
 115 {
 116         struct drm_i915_private *dev_priv = huc_to_i915(huc);
 117         u32 status;
 118
 119         if (!HAS_HUC(dev_priv))
 120                 return -ENODEV;
 121
 122         intel_runtime_pm_get(dev_priv);
 123         status = I915_READ(HUC_STATUS2) & HUC_FW_VERIFIED;
 124         intel_runtime_pm_put(dev_priv);
 125
 126         return status;
 127 }