drivers/gpu/drm/i915/pxp/intel_pxp_huc.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright(c) 2021-2022, Intel Corporation. All rights reserved.
   4  */
   5
   6 #include "i915_drv.h"
   7
   8 #include "gem/i915_gem_region.h"
   9 #include "gt/intel_gt.h"
  10
  11 #include "intel_pxp.h"
  12 #include "intel_pxp_huc.h"
  13 #include "intel_pxp_tee.h"
  14 #include "intel_pxp_types.h"
  15 #include "intel_pxp_cmd_interface_43.h"
  16
  17 int intel_pxp_huc_load_and_auth(struct intel_pxp *pxp)
  18 {
  19         struct intel_gt *gt;
  20         struct intel_huc *huc;
  21         struct pxp43_start_huc_auth_in huc_in = {0};
  22         struct pxp43_huc_auth_out huc_out = {0};
  23         dma_addr_t huc_phys_addr;
  24         u8 client_id = 0;
  25         u8 fence_id = 0;
  26         int err;
  27
  28         if (!pxp || !pxp->pxp_component)
  29                 return -ENODEV;
  30
  31         gt = pxp->ctrl_gt;
  32         huc = &gt->uc.huc;
  33
  34         huc_phys_addr = i915_gem_object_get_dma_address(huc->fw.obj, 0);
  35
  36         /* write the PXP message into the lmem (the sg list) */
  37         huc_in.header.api_version = PXP_APIVER(4, 3);
  38         huc_in.header.command_id  = PXP43_CMDID_START_HUC_AUTH;
  39         huc_in.header.status      = 0;
  40         huc_in.header.buffer_len  = sizeof(huc_in.huc_base_address);
  41         huc_in.huc_base_address   = cpu_to_le64(huc_phys_addr);
  42
  43         err = intel_pxp_tee_stream_message(pxp, client_id, fence_id,
  44                                            &huc_in, sizeof(huc_in),
  45                                            &huc_out, sizeof(huc_out));
  46         if (err < 0) {
  47                 drm_err(&gt->i915->drm,
  48                         "Failed to send HuC load and auth command to GSC [%d]!\n",
  49                         err);
  50                 return err;
  51         }
  52
  53         /*
  54          * HuC does sometimes survive suspend/resume (it depends on how "deep"
  55          * a sleep state the device reaches) so we can end up here on resume
  56          * with HuC already loaded, in which case the GSC will return
  57          * PXP_STATUS_OP_NOT_PERMITTED. We can therefore consider the GuC
  58          * correctly transferred in this scenario; if the same error is ever
  59          * returned with HuC not loaded we'll still catch it when we check the
  60          * authentication bit later.
  61          */
  62         if (huc_out.header.status != PXP_STATUS_SUCCESS &&
  63             huc_out.header.status != PXP_STATUS_OP_NOT_PERMITTED) {
  64                 drm_err(&gt->i915->drm,
  65                         "HuC load failed with GSC error = 0x%x\n",
  66                         huc_out.header.status);
  67                 return -EPROTO;
  68         }
  69
  70         return 0;
  71 }