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(&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_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 (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