Line data    Source code

       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             : 
      38             : typedef struct FW_ATT_DB_HEADER
      39             : {
      40             :         uint32_t AttDbVersion;           /* version of the fwar feature */
      41             :         uint32_t AttDbCookie;            /* cookie as an extra check for corrupt data */
      42             : } FW_ATT_DB_HEADER;
      43             : 
      44             : typedef struct FW_ATT_RECORD
      45             : {
      46             :         uint16_t AttFwIdV1;              /* Legacy FW Type field */
      47             :         uint16_t AttFwIdV2;              /* V2 FW ID field */
      48             :         uint32_t AttFWVersion;           /* FW Version */
      49             :         uint16_t AttFWActiveFunctionID;  /* The VF ID (only in VF Attestation Table) */
      50             :         uint8_t  AttSource;              /* FW source indicator */
      51             :         uint8_t  RecordValid;            /* Indicates whether the record is a valid entry */
      52             :         uint32_t AttFwTaId;              /* Ta ID (only in TA Attestation Table) */
      53             : } FW_ATT_RECORD;
      54             : 
      55             : static ssize_t amdgpu_fw_attestation_debugfs_read(struct file *f,
      56             :                                                   char __user *buf,
      57             :                                                   size_t size,
      58             :                                                   loff_t *pos)
      59             : {
      60             :         struct amdgpu_device *adev = (struct amdgpu_device *)file_inode(f)->i_private;
      61             :         uint64_t records_addr = 0;
      62             :         uint64_t vram_pos = 0;
      63             :         FW_ATT_DB_HEADER fw_att_hdr = {0};
      64             :         FW_ATT_RECORD fw_att_record = {0};
      65             : 
      66             :         if (size < sizeof(FW_ATT_RECORD)) {
      67             :                 DRM_WARN("FW attestation input buffer not enough memory");
      68             :                 return -EINVAL;
      69             :         }
      70             : 
      71             :         if ((*pos + sizeof(FW_ATT_DB_HEADER)) >= FW_ATTESTATION_MAX_SIZE) {
      72             :                 DRM_WARN("FW attestation out of bounds");
      73             :                 return 0;
      74             :         }
      75             : 
      76             :         if (psp_get_fw_attestation_records_addr(&adev->psp, &records_addr)) {
      77             :                 DRM_WARN("Failed to get FW attestation record address");
      78             :                 return -EINVAL;
      79             :         }
      80             : 
      81             :         vram_pos =  records_addr - adev->gmc.vram_start;
      82             : 
      83             :         if (*pos == 0) {
      84             :                 amdgpu_device_vram_access(adev,
      85             :                                           vram_pos,
      86             :                                           (uint32_t*)&fw_att_hdr,
      87             :                                           sizeof(FW_ATT_DB_HEADER),
      88             :                                           false);
      89             : 
      90             :                 if (fw_att_hdr.AttDbCookie != FW_ATTESTATION_DB_COOKIE) {
      91             :                         DRM_WARN("Invalid FW attestation cookie");
      92             :                         return -EINVAL;
      93             :                 }
      94             : 
      95             :                 DRM_INFO("FW attestation version = 0x%X", fw_att_hdr.AttDbVersion);
      96             :         }
      97             : 
      98             :         amdgpu_device_vram_access(adev,
      99             :                                   vram_pos + sizeof(FW_ATT_DB_HEADER) + *pos,
     100             :                                   (uint32_t*)&fw_att_record,
     101             :                                   sizeof(FW_ATT_RECORD),
     102             :                                   false);
     103             : 
     104             :         if (fw_att_record.RecordValid != FW_ATTESTATION_RECORD_VALID)
     105             :                 return 0;
     106             : 
     107             :         if (copy_to_user(buf, (void*)&fw_att_record, sizeof(FW_ATT_RECORD)))
     108             :                 return -EINVAL;
     109             : 
     110             :         *pos += sizeof(FW_ATT_RECORD);
     111             : 
     112             :         return sizeof(FW_ATT_RECORD);
     113             : }
     114             : 
     115             : static const struct file_operations amdgpu_fw_attestation_debugfs_ops = {
     116             :         .owner = THIS_MODULE,
     117             :         .read = amdgpu_fw_attestation_debugfs_read,
     118             :         .write = NULL,
     119             :         .llseek = default_llseek
     120             : };
     121             : 
     122             : static int amdgpu_is_fw_attestation_supported(struct amdgpu_device *adev)
     123             : {
     124             :         if (adev->flags & AMD_IS_APU)
     125             :                 return 0;
     126             : 
     127             :         if (adev->asic_type >= CHIP_SIENNA_CICHLID)
     128             :                 return 1;
     129             : 
     130             :         return 0;
     131             : }
     132             : 
     133           0 : void amdgpu_fw_attestation_debugfs_init(struct amdgpu_device *adev)
     134             : {
     135           0 :         if (!amdgpu_is_fw_attestation_supported(adev))
     136             :                 return;
     137             : 
     138             :         debugfs_create_file("amdgpu_fw_attestation",
     139             :                             S_IRUSR,
     140             :                             adev_to_drm(adev)->primary->debugfs_root,
     141             :                             adev,
     142             :                             &amdgpu_fw_attestation_debugfs_ops);
     143             : }