1// SPDX-License-Identifier: MIT
 2/*
 3 * Copyright(c) 2021-2022, Intel Corporation. All rights reserved.
 4 */
 5
 6#include <drm/i915_drm.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 = pxp_to_gt(pxp);
22	struct intel_huc *huc = &gt->uc.huc;
23	struct pxp43_start_huc_auth_in huc_in = {0};
24	struct pxp43_start_huc_auth_out huc_out = {0};
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_component)
31		return -ENODEV;
32
33	huc_phys_addr = i915_gem_object_get_dma_address(huc->fw.obj, 0);
34
35	/* write the PXP message into the lmem (the sg list) */
36	huc_in.header.api_version = PXP_APIVER(4, 3);
37	huc_in.header.command_id  = PXP43_CMDID_START_HUC_AUTH;
38	huc_in.header.status      = 0;
39	huc_in.header.buffer_len  = sizeof(huc_in.huc_base_address);
40	huc_in.huc_base_address   = huc_phys_addr;
41
42	err = intel_pxp_tee_stream_message(pxp, client_id, fence_id,
43					   &huc_in, sizeof(huc_in),
44					   &huc_out, sizeof(huc_out));
45	if (err < 0) {
46		drm_err(&gt->i915->drm,
47			"Failed to send HuC load and auth command to GSC [%d]!\n",
48			err);
49		return err;
50	}
51
52	/*
53	 * HuC does sometimes survive suspend/resume (it depends on how "deep"
54	 * a sleep state the device reaches) so we can end up here on resume
55	 * with HuC already loaded, in which case the GSC will return
56	 * PXP_STATUS_OP_NOT_PERMITTED. We can therefore consider the GuC
57	 * correctly transferred in this scenario; if the same error is ever
58	 * returned with HuC not loaded we'll still catch it when we check the
59	 * authentication bit later.
60	 */
61	if (huc_out.header.status != PXP_STATUS_SUCCESS &&
62	    huc_out.header.status != PXP_STATUS_OP_NOT_PERMITTED) {
63		drm_err(&gt->i915->drm,
64			"HuC load failed with GSC error = 0x%x\n",
65			huc_out.header.status);
66		return -EPROTO;
67	}
68
69	return 0;
70}