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 19 int 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 = >->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 &huc_in, sizeof(huc_in), 47 &huc_out, sizeof(huc_out)); 48 if (err < 0) { 49 drm_err(>->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(>->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