1// SPDX-License-Identifier: MIT
2/*
3 * Copyright(c) 2021-2022, Intel Corporation. All rights reserved.
4 */
5
6#include <drm/drm_print.h>
7
8#include "i915_drv.h"
9
10#include "gem/i915_gem_region.h"
11#include "gt/intel_gt.h"
12
13#include "intel_pxp.h"
14#include "intel_pxp_huc.h"
15#include "intel_pxp_tee.h"
16#include "intel_pxp_types.h"
17#include "intel_pxp_cmd_interface_43.h"
18
19int intel_pxp_huc_load_and_auth(struct intel_pxp *pxp)
20{
21 struct intel_gt *gt;
22 struct intel_huc *huc;
23 struct pxp43_start_huc_auth_in huc_in = {};
24 struct pxp43_huc_auth_out huc_out = {};
25 dma_addr_t huc_phys_addr;
26 u8 client_id = 0;
27 u8 fence_id = 0;
28 int err;
29
30 if (!pxp || !pxp->pxp_component)
31 return -ENODEV;
32
33 gt = pxp->ctrl_gt;
34 huc = &gt->uc.huc;
35
36 huc_phys_addr = i915_gem_object_get_dma_address(huc->fw.obj, 0);
37
38 /* write the PXP message into the lmem (the sg list) */
39 huc_in.header.api_version = PXP_APIVER(4, 3);
40 huc_in.header.command_id = PXP43_CMDID_START_HUC_AUTH;
41 huc_in.header.status = 0;
42 huc_in.header.buffer_len = sizeof(huc_in.huc_base_address);
43 huc_in.huc_base_address = cpu_to_le64(huc_phys_addr);
44
45 err = intel_pxp_tee_stream_message(pxp, client_id, fence_id,
46 msg_in: &huc_in, msg_in_len: sizeof(huc_in),
47 msg_out: &huc_out, msg_out_len: sizeof(huc_out));
48 if (err < 0) {
49 drm_err(&gt->i915->drm,
50 "Failed to send HuC load and auth command to GSC [%d]!\n",
51 err);
52 return err;
53 }
54
55 /*
56 * HuC does sometimes survive suspend/resume (it depends on how "deep"
57 * a sleep state the device reaches) so we can end up here on resume
58 * with HuC already loaded, in which case the GSC will return
59 * PXP_STATUS_OP_NOT_PERMITTED. We can therefore consider the GuC
60 * correctly transferred in this scenario; if the same error is ever
61 * returned with HuC not loaded we'll still catch it when we check the
62 * authentication bit later.
63 */
64 if (huc_out.header.status != PXP_STATUS_SUCCESS &&
65 huc_out.header.status != PXP_STATUS_OP_NOT_PERMITTED) {
66 drm_err(&gt->i915->drm,
67 "HuC load failed with GSC error = 0x%x\n",
68 huc_out.header.status);
69 return -EPROTO;
70 }
71
72 return 0;
73}
74

source code of linux/drivers/gpu/drm/i915/pxp/intel_pxp_huc.c