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