LXR linux/drivers/gpu/drm/amd/amdgpu/amdgpu_fw

   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
  38typedef 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
  44typedef 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
  55static 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
 115static 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
 122static int amdgpu_is_fw_attestation_supported(struct amdgpu_device *adev)
 123{
 124        if (adev->asic_type >= CHIP_SIENNA_CICHLID)
 125                return 1;
 126
 127        return 0;
 128}
 129
 130void amdgpu_fw_attestation_debugfs_init(struct amdgpu_device *adev)
 131{
 132        if (!amdgpu_is_fw_attestation_supported(adev))
 133                return;
 134
 135        debugfs_create_file("amdgpu_fw_attestation",
 136                            S_IRUSR,
 137                            adev_to_drm(adev)->primary->debugfs_root,
 138                            adev,
 139                            &amdgpu_fw_attestation_debugfs_ops);
 140}
 141