diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_fw_attestation.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_fw_attestation.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fw_attestation.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fw_attestation.c new file mode 100644 index 000000000000..c6947d6c7ff5 --- /dev/null +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fw_attestation.c @@ -0,0 +1,142 @@ +/* + * 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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