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
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(psp: &adev->psp, output_ptr: &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 pos: vram_pos,
84 buf: (uint32_t *)&fw_att_hdr,
85 size: sizeof(struct FW_ATT_DB_HEADER),
86 write: 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 pos: vram_pos + sizeof(struct FW_ATT_DB_HEADER) + *pos,
98 buf: (uint32_t *)&fw_att_record,
99 size: sizeof(struct FW_ATT_RECORD),
100 write: false);
101
102 if (fw_att_record.RecordValid != FW_ATTESTATION_RECORD_VALID)
103 return 0;
104
105 if (copy_to_user(to: buf, from: (void *)&fw_att_record, n: 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_llseek
118};
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 (amdgpu_ip_version(adev, ip: MP0_HWIP, inst: 0) == IP_VERSION(14, 0, 2) ||
126 amdgpu_ip_version(adev, ip: MP0_HWIP, inst: 0) == IP_VERSION(14, 0, 3))
127 return 0;
128
129 if (adev->asic_type >= CHIP_SIENNA_CICHLID)
130 return 1;
131
132 return 0;
133}
134
135void amdgpu_fw_attestation_debugfs_init(struct amdgpu_device *adev)
136{
137 if (!amdgpu_is_fw_attestation_supported(adev))
138 return;
139
140 debugfs_create_file("amdgpu_fw_attestation",
141 0400,
142 adev_to_drm(adev)->primary->debugfs_root,
143 adev,
144 &amdgpu_fw_attestation_debugfs_ops);
145}
146

source code of linux/drivers/gpu/drm/amd/amdgpu/amdgpu_fw_attestation.c