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 19 int 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 = >->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(>->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(>->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 } 71