drivers/scsi/scsi_devinfo.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <linux/blkdev.h>
   4 #include <linux/init.h>
   5 #include <linux/kernel.h>
   6 #include <linux/module.h>
   7 #include <linux/moduleparam.h>
   8 #include <linux/proc_fs.h>
   9 #include <linux/seq_file.h>
  10 #include <linux/slab.h>
  11
  12 #include <scsi/scsi_device.h>
  13 #include <scsi/scsi_devinfo.h>
  14
  15 #include "scsi_priv.h"
  16
  17
  18 /*
  19  * scsi_dev_info_list: structure to hold black/white listed devices.
  20  */
  21 struct scsi_dev_info_list {
  22         struct list_head dev_info_list;
  23         char vendor[8];
  24         char model[16];
  25         blist_flags_t flags;
  26         unsigned compatible; /* for use with scsi_static_device_list entries */
  27 };
  28
  29 struct scsi_dev_info_list_table {
  30         struct list_head node;  /* our node for being on the master list */
  31         struct list_head scsi_dev_info_list; /* head of dev info list */
  32         const char *name;       /* name of list for /proc (NULL for global) */
  33         int key;                /* unique numeric identifier */
  34 };
  35
  36
  37 static blist_flags_t scsi_default_dev_flags;
  38 static LIST_HEAD(scsi_dev_info_list);
  39 static char scsi_dev_flags[256];
  40
  41 /*
  42  * scsi_static_device_list: deprecated list of devices that require
  43  * settings that differ from the default, includes black-listed (broken)
  44  * devices. The entries here are added to the tail of scsi_dev_info_list
  45  * via scsi_dev_info_list_init.
  46  *
  47  * Do not add to this list, use the command line or proc interface to add
  48  * to the scsi_dev_info_list. This table will eventually go away.
  49  */
  50 static struct {
  51         char *vendor;
  52         char *model;
  53         char *revision; /* revision known to be bad, unused */
  54         blist_flags_t flags;
  55 } scsi_static_device_list[] __initdata = {
  56         /*
  57          * The following devices are known not to tolerate a lun != 0 scan
  58          * for one reason or another. Some will respond to all luns,
  59          * others will lock up.
  60          */
  61         {"Aashima", "IMAGERY 2400SP", "1.03", BLIST_NOLUN},     /* locks up */
  62         {"CHINON", "CD-ROM CDS-431", "H42", BLIST_NOLUN},       /* locks up */
  63         {"CHINON", "CD-ROM CDS-535", "Q14", BLIST_NOLUN},       /* locks up */
  64         {"DENON", "DRD-25X", "V", BLIST_NOLUN},                 /* locks up */
  65         {"HITACHI", "DK312C", "CM81", BLIST_NOLUN},     /* responds to all lun */
  66         {"HITACHI", "DK314C", "CR21", BLIST_NOLUN},     /* responds to all lun */
  67         {"IBM", "2104-DU3", NULL, BLIST_NOLUN},         /* locks up */
  68         {"IBM", "2104-TU3", NULL, BLIST_NOLUN},         /* locks up */
  69         {"IMS", "CDD521/10", "2.06", BLIST_NOLUN},      /* locks up */
  70         {"MAXTOR", "XT-3280", "PR02", BLIST_NOLUN},     /* locks up */
  71         {"MAXTOR", "XT-4380S", "B3C", BLIST_NOLUN},     /* locks up */
  72         {"MAXTOR", "MXT-1240S", "I1.2", BLIST_NOLUN},   /* locks up */
  73         {"MAXTOR", "XT-4170S", "B5A", BLIST_NOLUN},     /* locks up */
  74         {"MAXTOR", "XT-8760S", "B7B", BLIST_NOLUN},     /* locks up */
  75         {"MEDIAVIS", "RENO CD-ROMX2A", "2.03", BLIST_NOLUN},    /* responds to all lun */
  76         {"MICROTEK", "ScanMakerIII", "2.30", BLIST_NOLUN},      /* responds to all lun */
  77         {"NEC", "CD-ROM DRIVE:841", "1.0", BLIST_NOLUN},/* locks up */
  78         {"PHILIPS", "PCA80SC", "V4-2", BLIST_NOLUN},    /* responds to all lun */
  79         {"RODIME", "RO3000S", "2.33", BLIST_NOLUN},     /* locks up */
  80         {"SUN", "SENA", NULL, BLIST_NOLUN},             /* responds to all luns */
  81         /*
  82          * The following causes a failed REQUEST SENSE on lun 1 for
  83          * aha152x controller, which causes SCSI code to reset bus.
  84          */
  85         {"SANYO", "CRD-250S", "1.20", BLIST_NOLUN},
  86         /*
  87          * The following causes a failed REQUEST SENSE on lun 1 for
  88          * aha152x controller, which causes SCSI code to reset bus.
  89          */
  90         {"SEAGATE", "ST157N", "\004|j", BLIST_NOLUN},
  91         {"SEAGATE", "ST296", "921", BLIST_NOLUN},       /* responds to all lun */
  92         {"SEAGATE", "ST1581", "6538", BLIST_NOLUN},     /* responds to all lun */
  93         {"SONY", "CD-ROM CDU-541", "4.3d", BLIST_NOLUN},
  94         {"SONY", "CD-ROM CDU-55S", "1.0i", BLIST_NOLUN},
  95         {"SONY", "CD-ROM CDU-561", "1.7x", BLIST_NOLUN},
  96         {"SONY", "CD-ROM CDU-8012", NULL, BLIST_NOLUN},
  97         {"SONY", "SDT-5000", "3.17", BLIST_SELECT_NO_ATN},
  98         {"TANDBERG", "TDC 3600", "U07", BLIST_NOLUN},   /* locks up */
  99         {"TEAC", "CD-R55S", "1.0H", BLIST_NOLUN},       /* locks up */
 100         /*
 101          * The following causes a failed REQUEST SENSE on lun 1 for
 102          * seagate controller, which causes SCSI code to reset bus.
 103          */
 104         {"TEAC", "CD-ROM", "1.06", BLIST_NOLUN},
 105         {"TEAC", "MT-2ST/45S2-27", "RV M", BLIST_NOLUN},        /* responds to all lun */
 106         /*
 107          * The following causes a failed REQUEST SENSE on lun 1 for
 108          * seagate controller, which causes SCSI code to reset bus.
 109          */
 110         {"HP", "C1750A", "3226", BLIST_NOLUN},          /* scanjet iic */
 111         {"HP", "C1790A", NULL, BLIST_NOLUN},            /* scanjet iip */
 112         {"HP", "C2500A", NULL, BLIST_NOLUN},            /* scanjet iicx */
 113         {"MEDIAVIS", "CDR-H93MV", "1.31", BLIST_NOLUN}, /* locks up */
 114         {"MICROTEK", "ScanMaker II", "5.61", BLIST_NOLUN},      /* responds to all lun */
 115         {"MITSUMI", "CD-R CR-2201CS", "6119", BLIST_NOLUN},     /* locks up */
 116         {"NEC", "D3856", "0009", BLIST_NOLUN},
 117         {"QUANTUM", "LPS525S", "3110", BLIST_NOLUN},    /* locks up */
 118         {"QUANTUM", "PD1225S", "3110", BLIST_NOLUN},    /* locks up */
 119         {"QUANTUM", "FIREBALL ST4.3S", "0F0C", BLIST_NOLUN},    /* locks up */
 120         {"RELISYS", "Scorpio", NULL, BLIST_NOLUN},      /* responds to all lun */
 121         {"SANKYO", "CP525", "6.64", BLIST_NOLUN},       /* causes failed REQ SENSE, extra reset */
 122         {"TEXEL", "CD-ROM", "1.06", BLIST_NOLUN | BLIST_BORKEN},
 123         {"transtec", "T5008", "0001", BLIST_NOREPORTLUN },
 124         {"YAMAHA", "CDR100", "1.00", BLIST_NOLUN},      /* locks up */
 125         {"YAMAHA", "CDR102", "1.00", BLIST_NOLUN},      /* locks up */
 126         {"YAMAHA", "CRW8424S", "1.0", BLIST_NOLUN},     /* locks up */
 127         {"YAMAHA", "CRW6416S", "1.0c", BLIST_NOLUN},    /* locks up */
 128         {"", "Scanner", "1.80", BLIST_NOLUN},   /* responds to all lun */
 129
 130         /*
 131          * Other types of devices that have special flags.
 132          * Note that all USB devices should have the BLIST_INQUIRY_36 flag.
 133          */
 134         {"3PARdata", "VV", NULL, BLIST_REPORTLUN2},
 135         {"ADAPTEC", "AACRAID", NULL, BLIST_FORCELUN},
 136         {"ADAPTEC", "Adaptec 5400S", NULL, BLIST_FORCELUN},
 137         {"AIX", "VDASD", NULL, BLIST_TRY_VPD_PAGES | BLIST_NO_VPD_SIZE},
 138         {"AFT PRO", "-IX CF", "0.0>", BLIST_FORCELUN},
 139         {"BELKIN", "USB 2 HS-CF", "1.95",  BLIST_FORCELUN | BLIST_INQUIRY_36},
 140         {"BROWNIE", "1200U3P", NULL, BLIST_NOREPORTLUN},
 141         {"BROWNIE", "1600U3P", NULL, BLIST_NOREPORTLUN},
 142         {"CANON", "IPUBJD", NULL, BLIST_SPARSELUN},
 143         {"CBOX3", "USB Storage-SMC", "300A", BLIST_FORCELUN | BLIST_INQUIRY_36},
 144         {"CMD", "CRA-7280", NULL, BLIST_SPARSELUN},     /* CMD RAID Controller */
 145         {"CNSI", "G7324", NULL, BLIST_SPARSELUN},       /* Chaparral G7324 RAID */
 146         {"CNSi", "G8324", NULL, BLIST_SPARSELUN},       /* Chaparral G8324 RAID */
 147         {"COMPAQ", "ARRAY CONTROLLER", NULL, BLIST_SPARSELUN | BLIST_LARGELUN |
 148                 BLIST_MAX_512 | BLIST_REPORTLUN2},      /* Compaq RA4x00 */
 149         {"COMPAQ", "LOGICAL VOLUME", NULL, BLIST_FORCELUN | BLIST_MAX_512}, /* Compaq RA4x00 */
 150         {"COMPAQ", "CR3500", NULL, BLIST_FORCELUN},
 151         {"COMPAQ", "MSA1000", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},
 152         {"COMPAQ", "MSA1000 VOLUME", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},
 153         {"COMPAQ", "HSV110", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
 154         {"DDN", "SAN DataDirector", "*", BLIST_SPARSELUN},
 155         {"DEC", "HSG80", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
 156         {"DELL", "PV660F", NULL, BLIST_SPARSELUN},
 157         {"DELL", "PV660F   PSEUDO", NULL, BLIST_SPARSELUN},
 158         {"DELL", "PSEUDO DEVICE .", NULL, BLIST_SPARSELUN},     /* Dell PV 530F */
 159         {"DELL", "PV530F", NULL, BLIST_SPARSELUN},
 160         {"DELL", "PERCRAID", NULL, BLIST_FORCELUN},
 161         {"DGC", "RAID", NULL, BLIST_SPARSELUN}, /* EMC CLARiiON, storage on LUN 0 */
 162         {"DGC", "DISK", NULL, BLIST_SPARSELUN}, /* EMC CLARiiON, no storage on LUN 0 */
 163         {"EMC",  "Invista", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
 164         {"EMC", "SYMMETRIX", NULL, BLIST_SPARSELUN | BLIST_LARGELUN |
 165          BLIST_REPORTLUN2 | BLIST_RETRY_ITF},
 166         {"EMULEX", "MD21/S2     ESDI", NULL, BLIST_SINGLELUN},
 167         {"easyRAID", "16P", NULL, BLIST_NOREPORTLUN},
 168         {"easyRAID", "X6P", NULL, BLIST_NOREPORTLUN},
 169         {"easyRAID", "F8", NULL, BLIST_NOREPORTLUN},
 170         {"FSC", "CentricStor", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
 171         {"FUJITSU", "ETERNUS_DXM", "*", BLIST_RETRY_ASC_C1},
 172         {"Generic", "USB SD Reader", "1.00", BLIST_FORCELUN | BLIST_INQUIRY_36},
 173         {"Generic", "USB Storage-SMC", NULL, BLIST_FORCELUN | BLIST_INQUIRY_36}, /* FW: 0180 and 0207 */
 174         {"Generic", "Ultra HS-SD/MMC", "2.09", BLIST_IGN_MEDIA_CHANGE | BLIST_INQUIRY_36},
 175         {"HITACHI", "DF400", "*", BLIST_REPORTLUN2},
 176         {"HITACHI", "DF500", "*", BLIST_REPORTLUN2},
 177         {"HITACHI", "DISK-SUBSYSTEM", "*", BLIST_REPORTLUN2},
 178         {"HITACHI", "HUS1530", "*", BLIST_NO_DIF},
 179         {"HITACHI", "OPEN-", "*", BLIST_REPORTLUN2 | BLIST_TRY_VPD_PAGES},
 180         {"HP", "A6189A", NULL, BLIST_SPARSELUN | BLIST_LARGELUN},       /* HP VA7400 */
 181         {"HP", "OPEN-", "*", BLIST_REPORTLUN2 | BLIST_TRY_VPD_PAGES}, /* HP XP Arrays */
 182         {"HP", "NetRAID-4M", NULL, BLIST_FORCELUN},
 183         {"HP", "HSV100", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
 184         {"HP", "C1557A", NULL, BLIST_FORCELUN},
 185         {"HP", "C3323-300", "4269", BLIST_NOTQ},
 186         {"HP", "C5713A", NULL, BLIST_NOREPORTLUN},
 187         {"HP", "DISK-SUBSYSTEM", "*", BLIST_REPORTLUN2},
 188         {"HPE", "OPEN-", "*", BLIST_REPORTLUN2 | BLIST_TRY_VPD_PAGES},
 189         {"IBM", "AuSaV1S2", NULL, BLIST_FORCELUN},
 190         {"IBM", "ProFibre 4000R", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
 191         {"IBM", "2076", NULL, BLIST_NO_VPD_SIZE},
 192         {"IBM", "2105", NULL, BLIST_RETRY_HWERROR},
 193         {"iomega", "jaz 1GB", "J.86", BLIST_NOTQ | BLIST_NOLUN},
 194         {"IOMEGA", "ZIP", NULL, BLIST_NOTQ | BLIST_NOLUN},
 195         {"IOMEGA", "Io20S         *F", NULL, BLIST_KEY},
 196         {"INSITE", "Floptical   F*8I", NULL, BLIST_KEY},
 197         {"INSITE", "I325VM", NULL, BLIST_KEY},
 198         {"Intel", "Multi-Flex", NULL, BLIST_NO_RSOC},
 199         {"iRiver", "iFP Mass Driver", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
 200         {"LASOUND", "CDX7405", "3.10", BLIST_MAX5LUN | BLIST_SINGLELUN},
 201         {"Marvell", "Console", NULL, BLIST_SKIP_VPD_PAGES},
 202         {"Marvell", "91xx Config", "1.01", BLIST_SKIP_VPD_PAGES},
 203         {"MATSHITA", "PD-1", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 204         {"MATSHITA", "DMC-LC5", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
 205         {"MATSHITA", "DMC-LC40", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
 206         {"Medion", "Flash XL  MMC/SD", "2.6D", BLIST_FORCELUN},
 207         {"MegaRAID", "LD", NULL, BLIST_FORCELUN},
 208         {"MICROP", "4110", NULL, BLIST_NOTQ},
 209         {"MSFT", "Virtual HD", NULL, BLIST_MAX_1024 | BLIST_NO_RSOC},
 210         {"MYLEX", "DACARMRB", "*", BLIST_REPORTLUN2},
 211         {"nCipher", "Fastness Crypto", NULL, BLIST_FORCELUN},
 212         {"NAKAMICH", "MJ-4.8S", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 213         {"NAKAMICH", "MJ-5.16S", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 214         {"NEC", "PD-1 ODX654P", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 215         {"NEC", "iStorage", NULL, BLIST_REPORTLUN2},
 216         {"NRC", "MBR-7", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 217         {"NRC", "MBR-7.4", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 218         {"PIONEER", "CD-ROM DRM-600", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 219         {"PIONEER", "CD-ROM DRM-602X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 220         {"PIONEER", "CD-ROM DRM-604X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 221         {"PIONEER", "CD-ROM DRM-624X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 222         {"Promise", "VTrak E610f", NULL, BLIST_SPARSELUN | BLIST_NO_RSOC},
 223         {"Promise", "", NULL, BLIST_SPARSELUN},
 224         {"QEMU", "QEMU CD-ROM", NULL, BLIST_SKIP_VPD_PAGES},
 225         {"QNAP", "iSCSI Storage", NULL, BLIST_MAX_1024},
 226         {"SYNOLOGY", "iSCSI Storage", NULL, BLIST_MAX_1024},
 227         {"QUANTUM", "XP34301", "1071", BLIST_NOTQ},
 228         {"REGAL", "CDC-4X", NULL, BLIST_MAX5LUN | BLIST_SINGLELUN},
 229         {"SanDisk", "ImageMate CF-SD1", NULL, BLIST_FORCELUN},
 230         {"SEAGATE", "ST34555N", "0930", BLIST_NOTQ},    /* Chokes on tagged INQUIRY */
 231         {"SEAGATE", "ST3390N", "9546", BLIST_NOTQ},
 232         {"SEAGATE", "ST900MM0006", NULL, BLIST_SKIP_VPD_PAGES},
 233         {"SGI", "RAID3", "*", BLIST_SPARSELUN},
 234         {"SGI", "RAID5", "*", BLIST_SPARSELUN},
 235         {"SGI", "TP9100", "*", BLIST_REPORTLUN2},
 236         {"SGI", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
 237         {"SKhynix", "H28U74301AMR", NULL, BLIST_SKIP_VPD_PAGES},
 238         {"IBM", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
 239         {"SUN", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
 240         {"DELL", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
 241         {"STK", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
 242         {"NETAPP", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
 243         {"LSI", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
 244         {"ENGENIO", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
 245         {"LENOVO", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
 246         {"FUJITSU", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
 247         {"SanDisk", "Cruzer Blade", NULL, BLIST_TRY_VPD_PAGES |
 248                 BLIST_INQUIRY_36},
 249         {"SMSC", "USB 2 HS-CF", NULL, BLIST_SPARSELUN | BLIST_INQUIRY_36},
 250         {"SONY", "CD-ROM CDU-8001", NULL, BLIST_BORKEN},
 251         {"SONY", "TSL", NULL, BLIST_FORCELUN},          /* DDS3 & DDS4 autoloaders */
 252         {"ST650211", "CF", NULL, BLIST_RETRY_HWERROR},
 253         {"SUN", "T300", "*", BLIST_SPARSELUN},
 254         {"SUN", "T4", "*", BLIST_SPARSELUN},
 255         {"Tornado-", "F4", "*", BLIST_NOREPORTLUN},
 256         {"TOSHIBA", "CDROM", NULL, BLIST_ISROM},
 257         {"TOSHIBA", "CD-ROM", NULL, BLIST_ISROM},
 258         {"Traxdata", "CDR4120", NULL, BLIST_NOLUN},     /* locks up */
 259         {"USB2.0", "SMARTMEDIA/XD", NULL, BLIST_FORCELUN | BLIST_INQUIRY_36},
 260         {"WangDAT", "Model 2600", "01.7", BLIST_SELECT_NO_ATN},
 261         {"WangDAT", "Model 3200", "02.2", BLIST_SELECT_NO_ATN},
 262         {"WangDAT", "Model 1300", "02.4", BLIST_SELECT_NO_ATN},
 263         {"WDC WD25", "00JB-00FUA0", NULL, BLIST_NOREPORTLUN},
 264         {"XYRATEX", "RS", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
 265         {"Zzyzx", "RocketStor 500S", NULL, BLIST_SPARSELUN},
 266         {"Zzyzx", "RocketStor 2000", NULL, BLIST_SPARSELUN},
 267         { NULL, NULL, NULL, 0 },
 268 };
 269
 270 static struct scsi_dev_info_list_table *scsi_devinfo_lookup_by_key(int key)
 271 {
 272         struct scsi_dev_info_list_table *devinfo_table;
 273         int found = 0;
 274
 275         list_for_each_entry(devinfo_table, &scsi_dev_info_list, node)
 276                 if (devinfo_table->key == key) {
 277                         found = 1;
 278                         break;
 279                 }
 280         if (!found)
 281                 return ERR_PTR(-EINVAL);
 282
 283         return devinfo_table;
 284 }
 285
 286 /*
 287  * scsi_strcpy_devinfo: called from scsi_dev_info_list_add to copy into
 288  * devinfo vendor and model strings.
 289  */
 290 static void scsi_strcpy_devinfo(char *name, char *to, size_t to_length,
 291                                 char *from, int compatible)
 292 {
 293         size_t from_length;
 294
 295         from_length = strlen(from);
 296         /* This zero-pads the destination */
 297         strncpy(to, from, to_length);
 298         if (from_length < to_length && !compatible) {
 299                 /*
 300                  * space pad the string if it is short.
 301                  */
 302                 memset(&to[from_length], ' ', to_length - from_length);
 303         }
 304         if (from_length > to_length)
 305                  printk(KERN_WARNING "%s: %s string '%s' is too long\n",
 306                         __func__, name, from);
 307 }
 308
 309 /**
 310  * scsi_dev_info_list_add - add one dev_info list entry.
 311  * @compatible: if true, null terminate short strings.  Otherwise space pad.
 312  * @vendor:     vendor string
 313  * @model:      model (product) string
 314  * @strflags:   integer string
 315  * @flags:      if strflags NULL, use this flag value
 316  *
 317  * Description:
 318  *      Create and add one dev_info entry for @vendor, @model, @strflags or
 319  *      @flag. If @compatible, add to the tail of the list, do not space
 320  *      pad, and set devinfo->compatible. The scsi_static_device_list entries
 321  *      are added with @compatible 1 and @clfags NULL.
 322  *
 323  * Returns: 0 OK, -error on failure.
 324  **/
 325 static int scsi_dev_info_list_add(int compatible, char *vendor, char *model,
 326                             char *strflags, blist_flags_t flags)
 327 {
 328         return scsi_dev_info_list_add_keyed(compatible, vendor, model,
 329                                             strflags, flags,
 330                                             SCSI_DEVINFO_GLOBAL);
 331 }
 332
 333 /**
 334  * scsi_dev_info_list_add_keyed - add one dev_info list entry.
 335  * @compatible: if true, null terminate short strings.  Otherwise space pad.
 336  * @vendor:     vendor string
 337  * @model:      model (product) string
 338  * @strflags:   integer string
 339  * @flags:      if strflags NULL, use this flag value
 340  * @key:        specify list to use
 341  *
 342  * Description:
 343  *      Create and add one dev_info entry for @vendor, @model,
 344  *      @strflags or @flag in list specified by @key. If @compatible,
 345  *      add to the tail of the list, do not space pad, and set
 346  *      devinfo->compatible. The scsi_static_device_list entries are
 347  *      added with @compatible 1 and @clfags NULL.
 348  *
 349  * Returns: 0 OK, -error on failure.
 350  **/
 351 int scsi_dev_info_list_add_keyed(int compatible, char *vendor, char *model,
 352                                  char *strflags, blist_flags_t flags,
 353                                  enum scsi_devinfo_key key)
 354 {
 355         struct scsi_dev_info_list *devinfo;
 356         struct scsi_dev_info_list_table *devinfo_table =
 357                 scsi_devinfo_lookup_by_key(key);
 358
 359         if (IS_ERR(devinfo_table))
 360                 return PTR_ERR(devinfo_table);
 361
 362         devinfo = kmalloc(sizeof(*devinfo), GFP_KERNEL);
 363         if (!devinfo) {
 364                 printk(KERN_ERR "%s: no memory\n", __func__);
 365                 return -ENOMEM;
 366         }
 367
 368         scsi_strcpy_devinfo("vendor", devinfo->vendor, sizeof(devinfo->vendor),
 369                             vendor, compatible);
 370         scsi_strcpy_devinfo("model", devinfo->model, sizeof(devinfo->model),
 371                             model, compatible);
 372
 373         if (strflags) {
 374                 unsigned long long val;
 375                 int ret = kstrtoull(strflags, 0, &val);
 376
 377                 if (ret != 0) {
 378                         kfree(devinfo);
 379                         return ret;
 380                 }
 381                 flags = (__force blist_flags_t)val;
 382         }
 383         if (flags & __BLIST_UNUSED_MASK) {
 384                 pr_err("scsi_devinfo (%s:%s): unsupported flags 0x%llx",
 385                        vendor, model, flags & __BLIST_UNUSED_MASK);
 386                 kfree(devinfo);
 387                 return -EINVAL;
 388         }
 389         devinfo->flags = flags;
 390         devinfo->compatible = compatible;
 391
 392         if (compatible)
 393                 list_add_tail(&devinfo->dev_info_list,
 394                               &devinfo_table->scsi_dev_info_list);
 395         else
 396                 list_add(&devinfo->dev_info_list,
 397                          &devinfo_table->scsi_dev_info_list);
 398
 399         return 0;
 400 }
 401 EXPORT_SYMBOL(scsi_dev_info_list_add_keyed);
 402
 403 /**
 404  * scsi_dev_info_list_find - find a matching dev_info list entry.
 405  * @vendor:     full vendor string
 406  * @model:      full model (product) string
 407  * @key:        specify list to use
 408  *
 409  * Description:
 410  *      Finds the first dev_info entry matching @vendor, @model
 411  *      in list specified by @key.
 412  *
 413  * Returns: pointer to matching entry, or ERR_PTR on failure.
 414  **/
 415 static struct scsi_dev_info_list *scsi_dev_info_list_find(const char *vendor,
 416                 const char *model, enum scsi_devinfo_key key)
 417 {
 418         struct scsi_dev_info_list *devinfo;
 419         struct scsi_dev_info_list_table *devinfo_table =
 420                 scsi_devinfo_lookup_by_key(key);
 421         size_t vmax, mmax, mlen;
 422         const char *vskip, *mskip;
 423
 424         if (IS_ERR(devinfo_table))
 425                 return (struct scsi_dev_info_list *) devinfo_table;
 426
 427         /* Prepare for "compatible" matches */
 428
 429         /*
 430          * XXX why skip leading spaces? If an odd INQUIRY
 431          * value, that should have been part of the
 432          * scsi_static_device_list[] entry, such as "  FOO"
 433          * rather than "FOO". Since this code is already
 434          * here, and we don't know what device it is
 435          * trying to work with, leave it as-is.
 436          */
 437         vmax = sizeof(devinfo->vendor);
 438         vskip = vendor;
 439         while (vmax > 0 && *vskip == ' ') {
 440                 vmax--;
 441                 vskip++;
 442         }
 443         /* Also skip trailing spaces */
 444         while (vmax > 0 && vskip[vmax - 1] == ' ')
 445                 --vmax;
 446
 447         mmax = sizeof(devinfo->model);
 448         mskip = model;
 449         while (mmax > 0 && *mskip == ' ') {
 450                 mmax--;
 451                 mskip++;
 452         }
 453         while (mmax > 0 && mskip[mmax - 1] == ' ')
 454                 --mmax;
 455
 456         list_for_each_entry(devinfo, &devinfo_table->scsi_dev_info_list,
 457                             dev_info_list) {
 458                 if (devinfo->compatible) {
 459                         /*
 460                          * vendor strings must be an exact match
 461                          */
 462                         if (vmax != strnlen(devinfo->vendor,
 463                                             sizeof(devinfo->vendor)) ||
 464                             memcmp(devinfo->vendor, vskip, vmax))
 465                                 continue;
 466
 467                         /*
 468                          * @model specifies the full string, and
 469                          * must be larger or equal to devinfo->model
 470                          */
 471                         mlen = strnlen(devinfo->model, sizeof(devinfo->model));
 472                         if (mmax < mlen || memcmp(devinfo->model, mskip, mlen))
 473                                 continue;
 474                         return devinfo;
 475                 } else {
 476                         if (!memcmp(devinfo->vendor, vendor,
 477                                     sizeof(devinfo->vendor)) &&
 478                             !memcmp(devinfo->model, model,
 479                                     sizeof(devinfo->model)))
 480                                 return devinfo;
 481                 }
 482         }
 483
 484         return ERR_PTR(-ENOENT);
 485 }
 486
 487 /**
 488  * scsi_dev_info_list_del_keyed - remove one dev_info list entry.
 489  * @vendor:     vendor string
 490  * @model:      model (product) string
 491  * @key:        specify list to use
 492  *
 493  * Description:
 494  *      Remove and destroy one dev_info entry for @vendor, @model
 495  *      in list specified by @key.
 496  *
 497  * Returns: 0 OK, -error on failure.
 498  **/
 499 int scsi_dev_info_list_del_keyed(char *vendor, char *model,
 500                                  enum scsi_devinfo_key key)
 501 {
 502         struct scsi_dev_info_list *found;
 503
 504         found = scsi_dev_info_list_find(vendor, model, key);
 505         if (IS_ERR(found))
 506                 return PTR_ERR(found);
 507
 508         list_del(&found->dev_info_list);
 509         kfree(found);
 510         return 0;
 511 }
 512 EXPORT_SYMBOL(scsi_dev_info_list_del_keyed);
 513
 514 /**
 515  * scsi_dev_info_list_add_str - parse dev_list and add to the scsi_dev_info_list.
 516  * @dev_list:   string of device flags to add
 517  *
 518  * Description:
 519  *      Parse dev_list, and add entries to the scsi_dev_info_list.
 520  *      dev_list is of the form "vendor:product:flag,vendor:product:flag".
 521  *      dev_list is modified via strsep. Can be called for command line
 522  *      addition, for proc or mabye a sysfs interface.
 523  *
 524  * Returns: 0 if OK, -error on failure.
 525  **/
 526 static int scsi_dev_info_list_add_str(char *dev_list)
 527 {
 528         char *vendor, *model, *strflags, *next;
 529         char *next_check;
 530         int res = 0;
 531
 532         next = dev_list;
 533         if (next && next[0] == '"') {
 534                 /*
 535                  * Ignore both the leading and trailing quote.
 536                  */
 537                 next++;
 538                 next_check = ",\"";
 539         } else {
 540                 next_check = ",";
 541         }
 542
 543         /*
 544          * For the leading and trailing '"' case, the for loop comes
 545          * through the last time with vendor[0] == '\0'.
 546          */
 547         for (vendor = strsep(&next, ":"); vendor && (vendor[0] != '\0')
 548              && (res == 0); vendor = strsep(&next, ":")) {
 549                 strflags = NULL;
 550                 model = strsep(&next, ":");
 551                 if (model)
 552                         strflags = strsep(&next, next_check);
 553                 if (!model || !strflags) {
 554                         printk(KERN_ERR "%s: bad dev info string '%s' '%s'"
 555                                " '%s'\n", __func__, vendor, model,
 556                                strflags);
 557                         res = -EINVAL;
 558                 } else
 559                         res = scsi_dev_info_list_add(0 /* compatible */, vendor,
 560                                                      model, strflags, 0);
 561         }
 562         return res;
 563 }
 564
 565 /**
 566  * scsi_get_device_flags - get device specific flags from the dynamic
 567  *      device list.
 568  * @sdev:       &scsi_device to get flags for
 569  * @vendor:     vendor name
 570  * @model:      model name
 571  *
 572  * Description:
 573  *     Search the global scsi_dev_info_list (specified by list zero)
 574  *     for an entry matching @vendor and @model, if found, return the
 575  *     matching flags value, else return the host or global default
 576  *     settings.  Called during scan time.
 577  **/
 578 blist_flags_t scsi_get_device_flags(struct scsi_device *sdev,
 579                                     const unsigned char *vendor,
 580                                     const unsigned char *model)
 581 {
 582         return scsi_get_device_flags_keyed(sdev, vendor, model,
 583                                            SCSI_DEVINFO_GLOBAL);
 584 }
 585
 586
 587 /**
 588  * scsi_get_device_flags_keyed - get device specific flags from the dynamic device list
 589  * @sdev:       &scsi_device to get flags for
 590  * @vendor:     vendor name
 591  * @model:      model name
 592  * @key:        list to look up
 593  *
 594  * Description:
 595  *     Search the scsi_dev_info_list specified by @key for an entry
 596  *     matching @vendor and @model, if found, return the matching
 597  *     flags value, else return the host or global default settings.
 598  *     Called during scan time.
 599  **/
 600 blist_flags_t scsi_get_device_flags_keyed(struct scsi_device *sdev,
 601                                 const unsigned char *vendor,
 602                                 const unsigned char *model,
 603                                 enum scsi_devinfo_key key)
 604 {
 605         struct scsi_dev_info_list *devinfo;
 606
 607         devinfo = scsi_dev_info_list_find(vendor, model, key);
 608         if (!IS_ERR(devinfo))
 609                 return devinfo->flags;
 610
 611         /* key or device not found: return nothing */
 612         if (key != SCSI_DEVINFO_GLOBAL)
 613                 return 0;
 614
 615         /* except for the global list, where we have an exception */
 616         if (sdev->sdev_bflags)
 617                 return sdev->sdev_bflags;
 618
 619         return scsi_default_dev_flags;
 620 }
 621 EXPORT_SYMBOL(scsi_get_device_flags_keyed);
 622
 623 #ifdef CONFIG_SCSI_PROC_FS
 624 struct double_list {
 625         struct list_head *top;
 626         struct list_head *bottom;
 627 };
 628
 629 static int devinfo_seq_show(struct seq_file *m, void *v)
 630 {
 631         struct double_list *dl = v;
 632         struct scsi_dev_info_list_table *devinfo_table =
 633                 list_entry(dl->top, struct scsi_dev_info_list_table, node);
 634         struct scsi_dev_info_list *devinfo =
 635                 list_entry(dl->bottom, struct scsi_dev_info_list,
 636                            dev_info_list);
 637
 638         if (devinfo_table->scsi_dev_info_list.next == dl->bottom &&
 639             devinfo_table->name)
 640                 seq_printf(m, "[%s]:\n", devinfo_table->name);
 641
 642         seq_printf(m, "'%.8s' '%.16s' 0x%llx\n",
 643                    devinfo->vendor, devinfo->model, devinfo->flags);
 644         return 0;
 645 }
 646
 647 static void *devinfo_seq_start(struct seq_file *m, loff_t *ppos)
 648 {
 649         struct double_list *dl = kmalloc(sizeof(*dl), GFP_KERNEL);
 650         loff_t pos = *ppos;
 651
 652         if (!dl)
 653                 return NULL;
 654
 655         list_for_each(dl->top, &scsi_dev_info_list) {
 656                 struct scsi_dev_info_list_table *devinfo_table =
 657                         list_entry(dl->top, struct scsi_dev_info_list_table,
 658                                    node);
 659                 list_for_each(dl->bottom, &devinfo_table->scsi_dev_info_list)
 660                         if (pos-- == 0)
 661                                 return dl;
 662         }
 663
 664         kfree(dl);
 665         return NULL;
 666 }
 667
 668 static void *devinfo_seq_next(struct seq_file *m, void *v, loff_t *ppos)
 669 {
 670         struct double_list *dl = v;
 671         struct scsi_dev_info_list_table *devinfo_table =
 672                 list_entry(dl->top, struct scsi_dev_info_list_table, node);
 673
 674         ++*ppos;
 675         dl->bottom = dl->bottom->next;
 676         while (&devinfo_table->scsi_dev_info_list == dl->bottom) {
 677                 dl->top = dl->top->next;
 678                 if (dl->top == &scsi_dev_info_list) {
 679                         kfree(dl);
 680                         return NULL;
 681                 }
 682                 devinfo_table = list_entry(dl->top,
 683                                            struct scsi_dev_info_list_table,
 684                                            node);
 685                 dl->bottom = devinfo_table->scsi_dev_info_list.next;
 686         }
 687
 688         return dl;
 689 }
 690
 691 static void devinfo_seq_stop(struct seq_file *m, void *v)
 692 {
 693         kfree(v);
 694 }
 695
 696 static const struct seq_operations scsi_devinfo_seq_ops = {
 697         .start  = devinfo_seq_start,
 698         .next   = devinfo_seq_next,
 699         .stop   = devinfo_seq_stop,
 700         .show   = devinfo_seq_show,
 701 };
 702
 703 static int proc_scsi_devinfo_open(struct inode *inode, struct file *file)
 704 {
 705         return seq_open(file, &scsi_devinfo_seq_ops);
 706 }
 707
 708 /*
 709  * proc_scsi_dev_info_write - allow additions to scsi_dev_info_list via /proc.
 710  *
 711  * Description: Adds a black/white list entry for vendor and model with an
 712  * integer value of flag to the scsi device info list.
 713  * To use, echo "vendor:model:flag" > /proc/scsi/device_info
 714  */
 715 static ssize_t proc_scsi_devinfo_write(struct file *file,
 716                                        const char __user *buf,
 717                                        size_t length, loff_t *ppos)
 718 {
 719         char *buffer;
 720         ssize_t err = length;
 721
 722         if (!buf || length>PAGE_SIZE)
 723                 return -EINVAL;
 724         if (!(buffer = (char *) __get_free_page(GFP_KERNEL)))
 725                 return -ENOMEM;
 726         if (copy_from_user(buffer, buf, length)) {
 727                 err =-EFAULT;
 728                 goto out;
 729         }
 730
 731         if (length < PAGE_SIZE)
 732                 buffer[length] = '\0';
 733         else if (buffer[PAGE_SIZE-1]) {
 734                 err = -EINVAL;
 735                 goto out;
 736         }
 737
 738         scsi_dev_info_list_add_str(buffer);
 739
 740 out:
 741         free_page((unsigned long)buffer);
 742         return err;
 743 }
 744
 745 static const struct proc_ops scsi_devinfo_proc_ops = {
 746         .proc_open      = proc_scsi_devinfo_open,
 747         .proc_read      = seq_read,
 748         .proc_write     = proc_scsi_devinfo_write,
 749         .proc_lseek     = seq_lseek,
 750         .proc_release   = seq_release,
 751 };
 752 #endif /* CONFIG_SCSI_PROC_FS */
 753
 754 module_param_string(dev_flags, scsi_dev_flags, sizeof(scsi_dev_flags), 0);
 755 MODULE_PARM_DESC(dev_flags,
 756          "Given scsi_dev_flags=vendor:model:flags[,v:m:f] add black/white"
 757          " list entries for vendor and model with an integer value of flags"
 758          " to the scsi device info list");
 759
 760 module_param_named(default_dev_flags, scsi_default_dev_flags, ullong, 0644);
 761 MODULE_PARM_DESC(default_dev_flags,
 762                  "scsi default device flag uint64_t value");
 763
 764 /**
 765  * scsi_exit_devinfo - remove /proc/scsi/device_info & the scsi_dev_info_list
 766  **/
 767 void scsi_exit_devinfo(void)
 768 {
 769 #ifdef CONFIG_SCSI_PROC_FS
 770         remove_proc_entry("scsi/device_info", NULL);
 771 #endif
 772
 773         scsi_dev_info_remove_list(SCSI_DEVINFO_GLOBAL);
 774 }
 775
 776 /**
 777  * scsi_dev_info_add_list - add a new devinfo list
 778  * @key:        key of the list to add
 779  * @name:       Name of the list to add (for /proc/scsi/device_info)
 780  *
 781  * Adds the requested list, returns zero on success, -EEXIST if the
 782  * key is already registered to a list, or other error on failure.
 783  */
 784 int scsi_dev_info_add_list(enum scsi_devinfo_key key, const char *name)
 785 {
 786         struct scsi_dev_info_list_table *devinfo_table =
 787                 scsi_devinfo_lookup_by_key(key);
 788
 789         if (!IS_ERR(devinfo_table))
 790                 /* list already exists */
 791                 return -EEXIST;
 792
 793         devinfo_table = kmalloc(sizeof(*devinfo_table), GFP_KERNEL);
 794
 795         if (!devinfo_table)
 796                 return -ENOMEM;
 797
 798         INIT_LIST_HEAD(&devinfo_table->node);
 799         INIT_LIST_HEAD(&devinfo_table->scsi_dev_info_list);
 800         devinfo_table->name = name;
 801         devinfo_table->key = key;
 802         list_add_tail(&devinfo_table->node, &scsi_dev_info_list);
 803
 804         return 0;
 805 }
 806 EXPORT_SYMBOL(scsi_dev_info_add_list);
 807
 808 /**
 809  * scsi_dev_info_remove_list - destroy an added devinfo list
 810  * @key: key of the list to destroy
 811  *
 812  * Iterates over the entire list first, freeing all the values, then
 813  * frees the list itself.  Returns 0 on success or -EINVAL if the key
 814  * can't be found.
 815  */
 816 int scsi_dev_info_remove_list(enum scsi_devinfo_key key)
 817 {
 818         struct list_head *lh, *lh_next;
 819         struct scsi_dev_info_list_table *devinfo_table =
 820                 scsi_devinfo_lookup_by_key(key);
 821
 822         if (IS_ERR(devinfo_table))
 823                 /* no such list */
 824                 return -EINVAL;
 825
 826         /* remove from the master list */
 827         list_del(&devinfo_table->node);
 828
 829         list_for_each_safe(lh, lh_next, &devinfo_table->scsi_dev_info_list) {
 830                 struct scsi_dev_info_list *devinfo;
 831
 832                 devinfo = list_entry(lh, struct scsi_dev_info_list,
 833                                      dev_info_list);
 834                 kfree(devinfo);
 835         }
 836         kfree(devinfo_table);
 837
 838         return 0;
 839 }
 840 EXPORT_SYMBOL(scsi_dev_info_remove_list);
 841
 842 /**
 843  * scsi_init_devinfo - set up the dynamic device list.
 844  *
 845  * Description:
 846  *      Add command line entries from scsi_dev_flags, then add
 847  *      scsi_static_device_list entries to the scsi device info list.
 848  */
 849 int __init scsi_init_devinfo(void)
 850 {
 851 #ifdef CONFIG_SCSI_PROC_FS
 852         struct proc_dir_entry *p;
 853 #endif
 854         int error, i;
 855
 856         error = scsi_dev_info_add_list(SCSI_DEVINFO_GLOBAL, NULL);
 857         if (error)
 858                 return error;
 859
 860         error = scsi_dev_info_list_add_str(scsi_dev_flags);
 861         if (error)
 862                 goto out;
 863
 864         for (i = 0; scsi_static_device_list[i].vendor; i++) {
 865                 error = scsi_dev_info_list_add(1 /* compatibile */,
 866                                 scsi_static_device_list[i].vendor,
 867                                 scsi_static_device_list[i].model,
 868                                 NULL,
 869                                 scsi_static_device_list[i].flags);
 870                 if (error)
 871                         goto out;
 872         }
 873
 874 #ifdef CONFIG_SCSI_PROC_FS
 875         p = proc_create("scsi/device_info", 0, NULL, &scsi_devinfo_proc_ops);
 876         if (!p) {
 877                 error = -ENOMEM;
 878                 goto out;
 879         }
 880 #endif /* CONFIG_SCSI_PROC_FS */
 881
 882  out:
 883         if (error)
 884                 scsi_exit_devinfo();
 885         return error;
 886 }