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
17int 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 = {};
22	struct pxp43_huc_auth_out huc_out = {};
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}
72