1 /* 2 * Copyright 2020 Advanced Micro Devices, Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * 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 OR 20 * 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 0x143b6a37 35 #define FW_ATTESTATION_RECORD_VALID 1 36 #define FW_ATTESTATION_MAX_SIZE 4096 37 38 struct 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 43 struct 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 53 static 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 } 112 113 static 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_llseek 118 }; 119 120 static 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 } 130 131 void 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