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 typedef struct FW_ATT_DB_HEADER 39 { 40 uint32_t AttDbVersion; /* version of the fwar feature */ 41 uint32_t AttDbCookie; /* cookie as an extra check for corrupt data */ 42 } FW_ATT_DB_HEADER; 43 44 typedef struct FW_ATT_RECORD 45 { 46 uint16_t AttFwIdV1; /* Legacy FW Type field */ 47 uint16_t AttFwIdV2; /* V2 FW ID field */ 48 uint32_t AttFWVersion; /* FW Version */ 49 uint16_t AttFWActiveFunctionID; /* The VF ID (only in VF Attestation Table) */ 50 uint8_t AttSource; /* FW source indicator */ 51 uint8_t RecordValid; /* Indicates whether the record is a valid entry */ 52 uint32_t AttFwTaId; /* Ta ID (only in TA Attestation Table) */ 53 } FW_ATT_RECORD; 54 55 static ssize_t amdgpu_fw_attestation_debugfs_read(struct file *f, 56 char __user *buf, 57 size_t size, 58 loff_t *pos) 59 { 60 struct amdgpu_device *adev = (struct amdgpu_device *)file_inode(f)->i_private; 61 uint64_t records_addr = 0; 62 uint64_t vram_pos = 0; 63 FW_ATT_DB_HEADER fw_att_hdr = {0}; 64 FW_ATT_RECORD fw_att_record = {0}; 65 66 if (size < sizeof(FW_ATT_RECORD)) { 67 DRM_WARN("FW attestation input buffer not enough memory"); 68 return -EINVAL; 69 } 70 71 if ((*pos + sizeof(FW_ATT_DB_HEADER)) >= FW_ATTESTATION_MAX_SIZE) { 72 DRM_WARN("FW attestation out of bounds"); 73 return 0; 74 } 75 76 if (psp_get_fw_attestation_records_addr(&adev->psp, &records_addr)) { 77 DRM_WARN("Failed to get FW attestation record address"); 78 return -EINVAL; 79 } 80 81 vram_pos = records_addr - adev->gmc.vram_start; 82 83 if (*pos == 0) { 84 amdgpu_device_vram_access(adev, 85 vram_pos, 86 (uint32_t*)&fw_att_hdr, 87 sizeof(FW_ATT_DB_HEADER), 88 false); 89 90 if (fw_att_hdr.AttDbCookie != FW_ATTESTATION_DB_COOKIE) { 91 DRM_WARN("Invalid FW attestation cookie"); 92 return -EINVAL; 93 } 94 95 DRM_INFO("FW attestation version = 0x%X", fw_att_hdr.AttDbVersion); 96 } 97 98 amdgpu_device_vram_access(adev, 99 vram_pos + sizeof(FW_ATT_DB_HEADER) + *pos, 100 (uint32_t*)&fw_att_record, 101 sizeof(FW_ATT_RECORD), 102 false); 103 104 if (fw_att_record.RecordValid != FW_ATTESTATION_RECORD_VALID) 105 return 0; 106 107 if (copy_to_user(buf, (void*)&fw_att_record, sizeof(FW_ATT_RECORD))) 108 return -EINVAL; 109 110 *pos += sizeof(FW_ATT_RECORD); 111 112 return sizeof(FW_ATT_RECORD); 113 } 114 115 static const struct file_operations amdgpu_fw_attestation_debugfs_ops = { 116 .owner = THIS_MODULE, 117 .read = amdgpu_fw_attestation_debugfs_read, 118 .write = NULL, 119 .llseek = default_llseek 120 }; 121 122 static int amdgpu_is_fw_attestation_supported(struct amdgpu_device *adev) 123 { 124 if (adev->flags & AMD_IS_APU) 125 return 0; 126 127 if (adev->asic_type >= CHIP_SIENNA_CICHLID) 128 return 1; 129 130 return 0; 131 } 132 133 void amdgpu_fw_attestation_debugfs_init(struct amdgpu_device *adev) 134 { 135 if (!amdgpu_is_fw_attestation_supported(adev)) 136 return; 137 138 debugfs_create_file("amdgpu_fw_attestation", 139 S_IRUSR, 140 adev_to_drm(adev)->primary->debugfs_root, 141 adev, 142 &amdgpu_fw_attestation_debugfs_ops); 143 } 144