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_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 = >->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(>->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(>->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