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1/*2 * Copyright 2020 Advanced Micro Devices, Inc.3 *4 * Permission is hereby granted, free of charge, to any person obtaining a5 * copy of this software and associated documentation files (the "Software"),6 * to deal in the Software without restriction, including without limitation7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,8 * and/or sell copies of the Software, and to permit persons to whom the9 * Software is furnished to do so, subject to the following conditions:10 *11 * The above copyright notice and this permission notice shall be included in12 * all copies or substantial portions of the Software.13 *14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR20 * OTHER DEALINGS IN THE SOFTWARE.21 *22 */23 24#include <linux/debugfs.h>25#include <linux/firmware.h>26#include <linux/dma-mapping.h>27 28#include "amdgpu.h"29#include "amdgpu_fw_attestation.h"30#include "amdgpu_psp.h"31#include "amdgpu_ucode.h"32#include "soc15_common.h"33 34#define FW_ATTESTATION_DB_COOKIE 0x143b6a3735#define FW_ATTESTATION_RECORD_VALID 136#define FW_ATTESTATION_MAX_SIZE 409637 38struct FW_ATT_DB_HEADER {39 uint32_t AttDbVersion; /* version of the fwar feature */40 uint32_t AttDbCookie; /* cookie as an extra check for corrupt data */41};42 43struct FW_ATT_RECORD {44 uint16_t AttFwIdV1; /* Legacy FW Type field */45 uint16_t AttFwIdV2; /* V2 FW ID field */46 uint32_t AttFWVersion; /* FW Version */47 uint16_t AttFWActiveFunctionID; /* The VF ID (only in VF Attestation Table) */48 uint8_t AttSource; /* FW source indicator */49 uint8_t RecordValid; /* Indicates whether the record is a valid entry */50 uint32_t AttFwTaId; /* Ta ID (only in TA Attestation Table) */51};52 53static ssize_t amdgpu_fw_attestation_debugfs_read(struct file *f,54 char __user *buf,55 size_t size,56 loff_t *pos)57{58 struct amdgpu_device *adev = (struct amdgpu_device *)file_inode(f)->i_private;59 uint64_t records_addr = 0;60 uint64_t vram_pos = 0;61 struct FW_ATT_DB_HEADER fw_att_hdr = {0};62 struct FW_ATT_RECORD fw_att_record = {0};63 64 if (size < sizeof(struct FW_ATT_RECORD)) {65 DRM_WARN("FW attestation input buffer not enough memory");66 return -EINVAL;67 }68 69 if ((*pos + sizeof(struct FW_ATT_DB_HEADER)) >= FW_ATTESTATION_MAX_SIZE) {70 DRM_WARN("FW attestation out of bounds");71 return 0;72 }73 74 if (psp_get_fw_attestation_records_addr(&adev->psp, &records_addr)) {75 DRM_WARN("Failed to get FW attestation record address");76 return -EINVAL;77 }78 79 vram_pos = records_addr - adev->gmc.vram_start;80 81 if (*pos == 0) {82 amdgpu_device_vram_access(adev,83 vram_pos,84 (uint32_t *)&fw_att_hdr,85 sizeof(struct FW_ATT_DB_HEADER),86 false);87 88 if (fw_att_hdr.AttDbCookie != FW_ATTESTATION_DB_COOKIE) {89 DRM_WARN("Invalid FW attestation cookie");90 return -EINVAL;91 }92 93 DRM_INFO("FW attestation version = 0x%X", fw_att_hdr.AttDbVersion);94 }95 96 amdgpu_device_vram_access(adev,97 vram_pos + sizeof(struct FW_ATT_DB_HEADER) + *pos,98 (uint32_t *)&fw_att_record,99 sizeof(struct FW_ATT_RECORD),100 false);101 102 if (fw_att_record.RecordValid != FW_ATTESTATION_RECORD_VALID)103 return 0;104 105 if (copy_to_user(buf, (void *)&fw_att_record, sizeof(struct FW_ATT_RECORD)))106 return -EINVAL;107 108 *pos += sizeof(struct FW_ATT_RECORD);109 110 return sizeof(struct FW_ATT_RECORD);111}112 113static const struct file_operations amdgpu_fw_attestation_debugfs_ops = {114 .owner = THIS_MODULE,115 .read = amdgpu_fw_attestation_debugfs_read,116 .write = NULL,117 .llseek = default_llseek118};119 120static int amdgpu_is_fw_attestation_supported(struct amdgpu_device *adev)121{122 if (adev->flags & AMD_IS_APU)123 return 0;124 125 if (adev->asic_type >= CHIP_SIENNA_CICHLID)126 return 1;127 128 return 0;129}130 131void amdgpu_fw_attestation_debugfs_init(struct amdgpu_device *adev)132{133 if (!amdgpu_is_fw_attestation_supported(adev))134 return;135 136 debugfs_create_file("amdgpu_fw_attestation",137 0400,138 adev_to_drm(adev)->primary->debugfs_root,139 adev,140 &amdgpu_fw_attestation_debugfs_ops);141}142