platform-intel.c

   1 /*
   2  * Intel(R) Matrix Storage Manager hardware and firmware support routines
   3  *
   4  * Copyright (C) 2008 Intel Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19 #include "mdadm.h"
  20 #include "platform-intel.h"
  21 #include "probe_roms.h"
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <dirent.h>
  27 #include <fcntl.h>
  28 #include <sys/mman.h>
  29 #include <sys/types.h>
  30 #include <sys/stat.h>
  31 #include <limits.h>
  32
  33
  34 static __u16 devpath_to_vendor(const char *dev_path);
  35
  36 void free_sys_dev(struct sys_dev **list)
  37 {
  38         while (*list) {
  39                 struct sys_dev *next = (*list)->next;
  40
  41                 if ((*list)->path)
  42                         free((*list)->path);
  43                 free(*list);
  44                 *list = next;
  45         }
  46 }
  47
  48 struct sys_dev *find_driver_devices(const char *bus, const char *driver)
  49 {
  50         /* search sysfs for devices driven by 'driver' */
  51         char path[292];
  52         char link[256];
  53         char *c;
  54         DIR *driver_dir;
  55         struct dirent *de;
  56         struct sys_dev *head = NULL;
  57         struct sys_dev *list = NULL;
  58         enum sys_dev_type type;
  59
  60         if (strcmp(driver, "isci") == 0)
  61                 type = SYS_DEV_SAS;
  62         else if (strcmp(driver, "ahci") == 0)
  63                 type = SYS_DEV_SATA;
  64         else
  65                 type = SYS_DEV_UNKNOWN;
  66
  67         sprintf(path, "/sys/bus/%s/drivers/%s", bus, driver);
  68         driver_dir = opendir(path);
  69         if (!driver_dir)
  70                 return NULL;
  71         for (de = readdir(driver_dir); de; de = readdir(driver_dir)) {
  72                 int n;
  73
  74                 /* is 'de' a device? check that the 'subsystem' link exists and
  75                  * that its target matches 'bus'
  76                  */
  77                 sprintf(path, "/sys/bus/%s/drivers/%s/%s/subsystem",
  78                         bus, driver, de->d_name);
  79                 n = readlink(path, link, sizeof(link));
  80                 if (n < 0 || n >= (int)sizeof(link))
  81                         continue;
  82                 link[n] = '\0';
  83                 c = strrchr(link, '/');
  84                 if (!c)
  85                         continue;
  86                 if (strncmp(bus, c+1, strlen(bus)) != 0)
  87                         continue;
  88
  89                 sprintf(path, "/sys/bus/%s/drivers/%s/%s",
  90                         bus, driver, de->d_name);
  91
  92                 /* if it's not Intel device skip it. */
  93                 if (devpath_to_vendor(path) != 0x8086)
  94                         continue;
  95
  96                 /* start / add list entry */
  97                 if (!head) {
  98                         head = malloc(sizeof(*head));
  99                         list = head;
 100                 } else {
 101                         list->next = malloc(sizeof(*head));
 102                         list = list->next;
 103                 }
 104
 105                 if (!list) {
 106                         free_sys_dev(&head);
 107                         break;
 108                 }
 109
 110                 list->type = type;
 111                 list->path = canonicalize_file_name(path);
 112                 list->next = NULL;
 113                 if ((list->pci_id = strrchr(list->path, '/')) != NULL)
 114                         list->pci_id++;
 115         }
 116         closedir(driver_dir);
 117         return head;
 118 }
 119
 120
 121 static __u16 devpath_to_vendor(const char *dev_path)
 122 {
 123         char path[strlen(dev_path) + strlen("/vendor") + 1];
 124         char vendor[7];
 125         int fd;
 126         __u16 id = 0xffff;
 127         int n;
 128
 129         sprintf(path, "%s/vendor", dev_path);
 130
 131         fd = open(path, O_RDONLY);
 132         if (fd < 0)
 133                 return 0xffff;
 134
 135         n = read(fd, vendor, sizeof(vendor));
 136         if (n == sizeof(vendor)) {
 137                 vendor[n - 1] = '\0';
 138                 id = strtoul(vendor, NULL, 16);
 139         }
 140         close(fd);
 141
 142         return id;
 143 }
 144
 145 struct sys_dev *find_intel_devices(void)
 146 {
 147         struct sys_dev *ahci, *isci;
 148
 149         isci = find_driver_devices("pci", "isci");
 150         ahci = find_driver_devices("pci", "ahci");
 151
 152         if (!ahci) {
 153                 ahci = isci;
 154         } else {
 155                 struct sys_dev *elem = ahci;
 156                 while (elem->next)
 157                         elem = elem->next;
 158                 elem->next = isci;
 159         }
 160         return ahci;
 161 }
 162
 163 static int platform_has_intel_devices(void)
 164 {
 165         struct sys_dev *devices;
 166         devices = find_intel_devices();
 167         if (devices) {
 168                 free_sys_dev(&devices);
 169                 return 1;
 170         }
 171         return 0;
 172 }
 173
 174 /*
 175  * PCI Expansion ROM Data Structure Format */
 176 struct pciExpDataStructFormat {
 177         __u8  ver[4];
 178         __u16 vendorID;
 179         __u16 deviceID;
 180 } __attribute__ ((packed));
 181
 182 static struct imsm_orom imsm_orom[SYS_DEV_MAX];
 183 static int populated_orom[SYS_DEV_MAX];
 184
 185 static int scan(const void *start, const void *end, const void *data)
 186 {
 187         int offset;
 188         const struct imsm_orom *imsm_mem;
 189         int dev;
 190         int len = (end - start);
 191         struct pciExpDataStructFormat *ptr= (struct pciExpDataStructFormat *)data;
 192
 193         dprintf("ptr->vendorID: %lx __le16_to_cpu(ptr->deviceID): %lx \n",
 194                 (ulong) __le16_to_cpu(ptr->vendorID),
 195                 (ulong) __le16_to_cpu(ptr->deviceID));
 196
 197         if ((__le16_to_cpu(ptr->vendorID) == 0x8086) &&
 198             (__le16_to_cpu(ptr->deviceID) == 0x2822))
 199                 dev = SYS_DEV_SATA;
 200         else if ((__le16_to_cpu(ptr->vendorID) == 0x8086) &&
 201                  (__le16_to_cpu(ptr->deviceID) == 0x1D60))
 202                 dev = SYS_DEV_SAS;
 203         else
 204                 return 0;
 205
 206         for (offset = 0; offset < len; offset += 4) {
 207                 imsm_mem = start + offset;
 208                 if (memcmp(imsm_mem->signature, "$VER", 4) == 0) {
 209                         imsm_orom[dev] = *imsm_mem;
 210                         populated_orom[dev] = 1;
 211                         return populated_orom[SYS_DEV_SATA] && populated_orom[SYS_DEV_SAS];
 212                 }
 213         }
 214         return 0;
 215 }
 216
 217
 218 const struct imsm_orom *imsm_platform_test(enum sys_dev_type hba_id, int *populated,
 219                                            struct imsm_orom *imsm_orom)
 220 {
 221         memset(imsm_orom, 0, sizeof(*imsm_orom));
 222         imsm_orom->rlc = IMSM_OROM_RLC_RAID0 | IMSM_OROM_RLC_RAID1 |
 223                                 IMSM_OROM_RLC_RAID10 | IMSM_OROM_RLC_RAID5;
 224         imsm_orom->sss = IMSM_OROM_SSS_4kB | IMSM_OROM_SSS_8kB |
 225                                 IMSM_OROM_SSS_16kB | IMSM_OROM_SSS_32kB |
 226                                 IMSM_OROM_SSS_64kB | IMSM_OROM_SSS_128kB |
 227                                 IMSM_OROM_SSS_256kB | IMSM_OROM_SSS_512kB |
 228                                 IMSM_OROM_SSS_1MB | IMSM_OROM_SSS_2MB;
 229         imsm_orom->dpa = IMSM_OROM_DISKS_PER_ARRAY;
 230         imsm_orom->tds = IMSM_OROM_TOTAL_DISKS;
 231         imsm_orom->vpa = IMSM_OROM_VOLUMES_PER_ARRAY;
 232         imsm_orom->vphba = IMSM_OROM_VOLUMES_PER_HBA;
 233         imsm_orom->attr = imsm_orom->rlc | IMSM_OROM_ATTR_ChecksumVerify;
 234         *populated = 1;
 235
 236         if (check_env("IMSM_TEST_OROM_NORAID5")) {
 237                 imsm_orom->rlc = IMSM_OROM_RLC_RAID0 | IMSM_OROM_RLC_RAID1 |
 238                                 IMSM_OROM_RLC_RAID10;
 239         }
 240         if (check_env("IMSM_TEST_AHCI_EFI_NORAID5") && (hba_id == SYS_DEV_SAS)) {
 241                 imsm_orom->rlc = IMSM_OROM_RLC_RAID0 | IMSM_OROM_RLC_RAID1 |
 242                                 IMSM_OROM_RLC_RAID10;
 243         }
 244         if (check_env("IMSM_TEST_SCU_EFI_NORAID5") && (hba_id == SYS_DEV_SATA)) {
 245                 imsm_orom->rlc = IMSM_OROM_RLC_RAID0 | IMSM_OROM_RLC_RAID1 |
 246                                 IMSM_OROM_RLC_RAID10;
 247         }
 248
 249         return imsm_orom;
 250 }
 251
 252
 253
 254 static const struct imsm_orom *find_imsm_hba_orom(enum sys_dev_type hba_id)
 255 {
 256         unsigned long align;
 257
 258         if (hba_id >= SYS_DEV_MAX)
 259                 return NULL;
 260
 261         /* it's static data so we only need to read it once */
 262         if (populated_orom[hba_id]) {
 263                 dprintf("OROM CAP: %p, pid: %d pop: %d\n",
 264                         &imsm_orom[hba_id], (int) getpid(), populated_orom[hba_id]);
 265                 return &imsm_orom[hba_id];
 266         }
 267         if (check_env("IMSM_TEST_OROM")) {
 268                 dprintf("OROM CAP: %p,  pid: %d pop: %d\n",
 269                      &imsm_orom[hba_id], (int) getpid(), populated_orom[hba_id]);
 270                 return imsm_platform_test(hba_id, &populated_orom[hba_id], &imsm_orom[hba_id]);
 271         }
 272         /* return empty OROM capabilities in EFI test mode */
 273         if (check_env("IMSM_TEST_AHCI_EFI") ||
 274             check_env("IMSM_TEST_SCU_EFI"))
 275                 return NULL;
 276
 277         if (!platform_has_intel_devices())
 278                 return NULL;
 279
 280         /* scan option-rom memory looking for an imsm signature */
 281         if (check_env("IMSM_SAFE_OROM_SCAN"))
 282                 align = 2048;
 283         else
 284                 align = 512;
 285         if (probe_roms_init(align) != 0)
 286                 return NULL;
 287         probe_roms();
 288         /* ignore result - True is returned if both are found */
 289         scan_adapter_roms(scan);
 290         probe_roms_exit();
 291
 292         if (populated_orom[hba_id])
 293                 return &imsm_orom[hba_id];
 294         return NULL;
 295 }
 296
 297
 298 /*
 299  * backward interface compatibility
 300  */
 301 const struct imsm_orom *find_imsm_orom(void)
 302 {
 303         return find_imsm_hba_orom(SYS_DEV_SATA);
 304 }
 305
 306 const struct imsm_orom *find_imsm_capability(enum sys_dev_type hba_id)
 307 {
 308         const struct imsm_orom *cap=NULL;
 309
 310         if ((cap = find_imsm_hba_orom(hba_id)) != NULL)
 311                 return cap;
 312         return NULL;
 313 }
 314
 315 char *devt_to_devpath(dev_t dev)
 316 {
 317         char device[46];
 318
 319         sprintf(device, "/sys/dev/block/%d:%d/device", major(dev), minor(dev));
 320         return canonicalize_file_name(device);
 321 }
 322
 323 char *diskfd_to_devpath(int fd)
 324 {
 325         /* return the device path for a disk, return NULL on error or fd
 326          * refers to a partition
 327          */
 328         struct stat st;
 329
 330         if (fstat(fd, &st) != 0)
 331                 return NULL;
 332         if (!S_ISBLK(st.st_mode))
 333                 return NULL;
 334
 335         return devt_to_devpath(st.st_rdev);
 336 }
 337
 338 int path_attached_to_hba(const char *disk_path, const char *hba_path)
 339 {
 340         int rc;
 341
 342         if (check_env("IMSM_TEST_AHCI_DEV") ||
 343             check_env("IMSM_TEST_SCU_DEV")) {
 344                 return 1;
 345         }
 346
 347         if (!disk_path || !hba_path)
 348                 return 0;
 349         dprintf("hba: %s - disk: %s\n", hba_path, disk_path);
 350         if (strncmp(disk_path, hba_path, strlen(hba_path)) == 0)
 351                 rc = 1;
 352         else
 353                 rc = 0;
 354
 355         return rc;
 356 }
 357
 358 int devt_attached_to_hba(dev_t dev, const char *hba_path)
 359 {
 360         char *disk_path = devt_to_devpath(dev);
 361         int rc = path_attached_to_hba(disk_path, hba_path);
 362
 363         if (disk_path)
 364                 free(disk_path);
 365
 366         return rc;
 367 }
 368
 369 int disk_attached_to_hba(int fd, const char *hba_path)
 370 {
 371         char *disk_path = diskfd_to_devpath(fd);
 372         int rc = path_attached_to_hba(disk_path, hba_path);
 373
 374         if (disk_path)
 375                 free(disk_path);
 376
 377         return rc;
 378 }