xref: /linux/drivers/gpu/drm/i915/pxp/intel_pxp_huc.c (revision d6fd48ef)
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_start_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   = 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