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/*
* Copyright 2020 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
*/
#include <linux/debugfs.h>
#include <linux/firmware.h>
#include <linux/dma-mapping.h>
#include "amdgpu.h"
#include "amdgpu_psp.h"
#include "amdgpu_ucode.h"
#include "soc15_common.h"
#define FW_ATTESTATION_DB_COOKIE 0x143b6a37
#define FW_ATTESTATION_RECORD_VALID 1
#define FW_ATTESTATION_MAX_SIZE 4096
typedef struct FW_ATT_DB_HEADER
{
uint32_t AttDbVersion; /* version of the fwar feature */
uint32_t AttDbCookie; /* cookie as an extra check for corrupt data */
} FW_ATT_DB_HEADER;
typedef struct FW_ATT_RECORD
{
uint16_t AttFwIdV1; /* Legacy FW Type field */
uint16_t AttFwIdV2; /* V2 FW ID field */
uint32_t AttFWVersion; /* FW Version */
uint16_t AttFWActiveFunctionID; /* The VF ID (only in VF Attestation Table) */
uint16_t AttSource; /* FW source indicator */
uint16_t RecordValid; /* Indicates whether the record is a valid entry */
uint8_t AttFwTaId; /* Ta ID (only in TA Attestation Table) */
uint8_t Reserved;
} FW_ATT_RECORD;
static ssize_t amdgpu_fw_attestation_debugfs_read(struct file *f,
char __user *buf,
size_t size,
loff_t *pos)
{
struct amdgpu_device *adev = (struct amdgpu_device *)file_inode(f)->i_private;
uint64_t records_addr = 0;
uint64_t vram_pos = 0;
FW_ATT_DB_HEADER fw_att_hdr = {0};
FW_ATT_RECORD fw_att_record = {0};
if (size < sizeof(FW_ATT_RECORD)) {
DRM_WARN("FW attestation input buffer not enough memory");
return -EINVAL;
}
if ((*pos + sizeof(FW_ATT_DB_HEADER)) >= FW_ATTESTATION_MAX_SIZE) {
DRM_WARN("FW attestation out of bounds");
return 0;
}
if (psp_get_fw_attestation_records_addr(&adev->psp, &records_addr)) {
DRM_WARN("Failed to get FW attestation record address");
return -EINVAL;
}
vram_pos = records_addr - adev->gmc.vram_start;
if (*pos == 0) {
amdgpu_device_vram_access(adev,
vram_pos,
(uint32_t*)&fw_att_hdr,
sizeof(FW_ATT_DB_HEADER),
false);
if (fw_att_hdr.AttDbCookie != FW_ATTESTATION_DB_COOKIE) {
DRM_WARN("Invalid FW attestation cookie");
return -EINVAL;
}
DRM_INFO("FW attestation version = 0x%X", fw_att_hdr.AttDbVersion);
}
amdgpu_device_vram_access(adev,
vram_pos + sizeof(FW_ATT_DB_HEADER) + *pos,
(uint32_t*)&fw_att_record,
sizeof(FW_ATT_RECORD),
false);
if (fw_att_record.RecordValid != FW_ATTESTATION_RECORD_VALID)
return 0;
if (copy_to_user(buf, (void*)&fw_att_record, sizeof(FW_ATT_RECORD)))
return -EINVAL;
*pos += sizeof(FW_ATT_RECORD);
return sizeof(FW_ATT_RECORD);
}
static const struct file_operations amdgpu_fw_attestation_debugfs_ops = {
.owner = THIS_MODULE,
.read = amdgpu_fw_attestation_debugfs_read,
.write = NULL,
.llseek = default_llseek
};
static int amdgpu_is_fw_attestation_supported(struct amdgpu_device *adev)
{
if (adev->asic_type >= CHIP_SIENNA_CICHLID)
return 1;
return 0;
}
void amdgpu_fw_attestation_debugfs_init(struct amdgpu_device *adev)
{
#if defined(CONFIG_DEBUG_FS)
if (!amdgpu_is_fw_attestation_supported(adev))
return;
debugfs_create_file("amdgpu_fw_attestation",
S_IRUSR,
adev_to_drm(adev)->primary->debugfs_root,
adev,
&amdgpu_fw_attestation_debugfs_ops);
#endif
}
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