arch/common/boot/grub2/disk/dmraid_nvidia.c

   1 /* dmraid_nvidia.c - module to handle Nvidia fakeraid.  */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2006,2007,2008  Free Software Foundation, Inc.
   5  *
   6  *  GRUB is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <grub/dl.h>
  21 #include <grub/disk.h>
  22 #include <grub/mm.h>
  23 #include <grub/err.h>
  24 #include <grub/misc.h>
  25 #include <grub/raid.h>
  26
  27 #define NV_SIGNATURES           4
  28
  29 #define NV_IDLE                 0
  30 #define NV_SCDB_INIT_RAID       2
  31 #define NV_SCDB_REBUILD_RAID    3
  32 #define NV_SCDB_UPGRADE_RAID    4
  33 #define NV_SCDB_SYNC_RAID       5
  34
  35 #define NV_LEVEL_UNKNOWN        0x00
  36 #define NV_LEVEL_JBOD           0xFF
  37 #define NV_LEVEL_0              0x80
  38 #define NV_LEVEL_1              0x81
  39 #define NV_LEVEL_3              0x83
  40 #define NV_LEVEL_5              0x85
  41 #define NV_LEVEL_10             0x8a
  42 #define NV_LEVEL_1_0            0x8180
  43
  44 #define NV_ARRAY_FLAG_BOOT              1 /* BIOS use only.  */
  45 #define NV_ARRAY_FLAG_ERROR             2 /* Degraded or offling.  */
  46 #define NV_ARRAY_FLAG_PARITY_VALID      4 /* RAID-3/5 parity valid.  */
  47
  48 struct grub_nv_array
  49 {
  50   grub_uint32_t version;
  51   grub_uint32_t signature[NV_SIGNATURES];
  52   grub_uint8_t raid_job_code;
  53   grub_uint8_t stripe_width;
  54   grub_uint8_t total_volumes;
  55   grub_uint8_t original_width;
  56   grub_uint32_t raid_level;
  57   grub_uint32_t stripe_block_size;
  58   grub_uint32_t stripe_block_size_bytes;
  59   grub_uint32_t stripe_block_size_log2;
  60   grub_uint32_t stripe_mask;
  61   grub_uint32_t stripe_size;
  62   grub_uint32_t stripe_size_bytes;
  63   grub_uint32_t raid_job_mask;
  64   grub_uint32_t original_capacity;
  65   grub_uint32_t flags;
  66 };
  67
  68 #define NV_ID_LEN               8
  69 #define NV_ID_STRING            "NVIDIA"
  70 #define NV_VERSION              100
  71
  72 #define NV_PRODID_LEN           16
  73 #define NV_PRODREV_LEN          4
  74
  75 struct grub_nv_super
  76 {
  77   char vendor[NV_ID_LEN];       /* 0x00 - 0x07 ID string.  */
  78   grub_uint32_t size;           /* 0x08 - 0x0B Size of metadata in dwords.  */
  79   grub_uint32_t chksum;         /* 0x0C - 0x0F Checksum of this struct.  */
  80   grub_uint16_t version;        /* 0x10 - 0x11 NV version.  */
  81   grub_uint8_t unit_number;     /* 0x12 Disk index in array.  */
  82   grub_uint8_t reserved;        /* 0x13.  */
  83   grub_uint32_t capacity;       /* 0x14 - 0x17 Array capacity in sectors.  */
  84   grub_uint32_t sector_size;    /* 0x18 - 0x1B Sector size.  */
  85   char prodid[NV_PRODID_LEN];   /* 0x1C - 0x2B Array product ID.  */
  86   char prodrev[NV_PRODREV_LEN]; /* 0x2C - 0x2F Array product revision */
  87   grub_uint32_t unit_flags;     /* 0x30 - 0x33 Flags for this disk */
  88   struct grub_nv_array array;   /* Array information */
  89 } __attribute__ ((packed));
  90
  91 static grub_err_t
  92 grub_dmraid_nv_detect (grub_disk_t disk, struct grub_raid_array *array)
  93 {
  94   grub_disk_addr_t sector;
  95   struct grub_nv_super sb;
  96
  97   if (disk->partition)
  98     return grub_error (GRUB_ERR_OUT_OF_RANGE, "skip partition");
  99
 100   sector = grub_disk_get_size (disk) - 2;
 101
 102   if (grub_disk_read (disk, sector, 0, sizeof (sb), (char *) &sb))
 103     return grub_errno;
 104
 105   if (grub_memcmp (sb.vendor, NV_ID_STRING, 6))
 106     return grub_error (GRUB_ERR_OUT_OF_RANGE, "not raid");
 107
 108   if (sb.version != NV_VERSION)
 109     return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
 110                        "Unknown version: %d.%d", sb.version);
 111
 112   switch (sb.array.raid_level)
 113     {
 114     case NV_LEVEL_0:
 115       array->level = 0;
 116       array->disk_size = sb.capacity / sb.array.total_volumes;
 117       break;
 118
 119     case NV_LEVEL_1:
 120       array->level = 1;
 121       array->disk_size = sb.capacity;
 122       break;
 123
 124     case NV_LEVEL_5:
 125       array->level = 5;
 126       array->layout = GRUB_RAID_LAYOUT_LEFT_ASYMMETRIC;
 127       array->disk_size = sb.capacity / (sb.array.total_volumes - 1);
 128       break;
 129
 130     default:
 131       return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
 132                          "Unsupported RAID level: %d", sb.array.raid_level);
 133     }
 134
 135   array->number = 0;
 136   array->total_devs = sb.array.total_volumes;
 137   array->chunk_size = sb.array.stripe_block_size;
 138   array->index = sb.unit_number;
 139   array->uuid_len = sizeof (sb.array.signature);
 140   array->uuid = grub_malloc (sizeof (sb.array.signature));
 141   if (! array->uuid)
 142     return grub_errno;
 143
 144   grub_memcpy (array->uuid, (char *) &sb.array.signature,
 145                sizeof (sb.array.signature));
 146
 147   return 0;
 148 }
 149
 150 static struct grub_raid grub_dmraid_nv_dev =
 151 {
 152   .name = "dmraid_nv",
 153   .detect = grub_dmraid_nv_detect,
 154   .next = 0
 155 };
 156
 157 GRUB_MOD_INIT(dm_nv)
 158 {
 159   grub_raid_register (&grub_dmraid_nv_dev);
 160 }
 161
 162 GRUB_MOD_FINI(dm_nv)
 163 {
 164   grub_raid_register (&grub_dmraid_nv_dev);
 165 }