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 STUB(); 59 return -ENOSYS; 60 #ifdef notyet 61 struct amdgpu_device *adev = (struct amdgpu_device *)file_inode(f)->i_private; 62 uint64_t records_addr = 0; 63 uint64_t vram_pos = 0; 64 struct FW_ATT_DB_HEADER fw_att_hdr = {0}; 65 struct FW_ATT_RECORD fw_att_record = {0}; 66 67 if (size < sizeof(struct FW_ATT_RECORD)) { 68 DRM_WARN("FW attestation input buffer not enough memory"); 69 return -EINVAL; 70 } 71 72 if ((*pos + sizeof(struct FW_ATT_DB_HEADER)) >= FW_ATTESTATION_MAX_SIZE) { 73 DRM_WARN("FW attestation out of bounds"); 74 return 0; 75 } 76 77 if (psp_get_fw_attestation_records_addr(&adev->psp, &records_addr)) { 78 DRM_WARN("Failed to get FW attestation record address"); 79 return -EINVAL; 80 } 81 82 vram_pos = records_addr - adev->gmc.vram_start; 83 84 if (*pos == 0) { 85 amdgpu_device_vram_access(adev, 86 vram_pos, 87 (uint32_t *)&fw_att_hdr, 88 sizeof(struct FW_ATT_DB_HEADER), 89 false); 90 91 if (fw_att_hdr.AttDbCookie != FW_ATTESTATION_DB_COOKIE) { 92 DRM_WARN("Invalid FW attestation cookie"); 93 return -EINVAL; 94 } 95 96 DRM_INFO("FW attestation version = 0x%X", fw_att_hdr.AttDbVersion); 97 } 98 99 amdgpu_device_vram_access(adev, 100 vram_pos + sizeof(struct FW_ATT_DB_HEADER) + *pos, 101 (uint32_t *)&fw_att_record, 102 sizeof(struct FW_ATT_RECORD), 103 false); 104 105 if (fw_att_record.RecordValid != FW_ATTESTATION_RECORD_VALID) 106 return 0; 107 108 if (copy_to_user(buf, (void *)&fw_att_record, sizeof(struct FW_ATT_RECORD))) 109 return -EINVAL; 110 111 *pos += sizeof(struct FW_ATT_RECORD); 112 113 return sizeof(struct FW_ATT_RECORD); 114 #endif 115 } 116 117 #ifdef notyet 118 static const struct file_operations amdgpu_fw_attestation_debugfs_ops = { 119 .owner = THIS_MODULE, 120 .read = amdgpu_fw_attestation_debugfs_read, 121 .write = NULL, 122 .llseek = default_llseek 123 }; 124 #endif 125 126 static int amdgpu_is_fw_attestation_supported(struct amdgpu_device *adev) 127 { 128 if (adev->flags & AMD_IS_APU) 129 return 0; 130 131 if (adev->asic_type >= CHIP_SIENNA_CICHLID) 132 return 1; 133 134 return 0; 135 } 136 137 void amdgpu_fw_attestation_debugfs_init(struct amdgpu_device *adev) 138 { 139 if (!amdgpu_is_fw_attestation_supported(adev)) 140 return; 141 142 debugfs_create_file("amdgpu_fw_attestation", 143 0400, 144 adev_to_drm(adev)->primary->debugfs_root, 145 adev, 146 &amdgpu_fw_attestation_debugfs_ops); 147 } 148