usr/src/cmd/devfsadm/sgen_link.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #include <devfsadm.h>
  27 #include <stdio.h>
  28 #include <strings.h>
  29 #include <stdlib.h>
  30 #include <limits.h>
  31 #include <ctype.h>
  32 #include <sys/int_fmtio.h>
  33 #include <sys/scsi/scsi_address.h>
  34 #include <sys/libdevid.h>
  35
  36 #define SGEN_LINK_RE    "^scsi/.+/c[0-9]+t[0-9A-F]+d[0-9]+$"
  37 #define SGEN_DIR        "scsi"
  38 #define SGEN_CLASS      "generic-scsi"
  39
  40 static int sgen_callback(di_minor_t minor, di_node_t node);
  41 static char *find_ctrlr(di_node_t node, di_minor_t minor);
  42
  43
  44 static devfsadm_create_t sgen_create_cbt[] = {
  45         { SGEN_CLASS, "ddi_generic:scsi", NULL,
  46             TYPE_EXACT | CREATE_DEFER, ILEVEL_0, sgen_callback
  47         }
  48 };
  49
  50 DEVFSADM_CREATE_INIT_V0(sgen_create_cbt);
  51
  52 /*
  53  * HOT auto cleanup of sgen links not desired.
  54  */
  55 static devfsadm_remove_t sgen_remove_cbt[] = {
  56         { SGEN_CLASS, SGEN_LINK_RE, RM_POST,
  57                 ILEVEL_0, devfsadm_rm_all
  58         }
  59 };
  60
  61 DEVFSADM_REMOVE_INIT_V0(sgen_remove_cbt);
  62
  63 static int
  64 sgen_callback(di_minor_t minor, di_node_t node)
  65 {
  66         char *baddr, *cnum, *tstr;
  67         char lpath[PATH_MAX], buf[PATH_MAX];
  68         uchar_t *wwnstr;
  69         char *tgt_port;
  70
  71
  72         if ((cnum = find_ctrlr(node, minor)) == NULL)
  73                 goto done;
  74
  75         /*
  76          * SCSAv3 attached devices.
  77          */
  78         if (di_prop_lookup_strings(DDI_DEV_T_ANY, node,
  79             SCSI_ADDR_PROP_TARGET_PORT, &tgt_port) > 0) {
  80                 uint64_t wwn;
  81                 scsi_lun64_t sl;
  82                 scsi_lun_t lun;
  83                 int64_t lun64;
  84                 int64_t *lun64p;
  85                 int *intp;
  86                 uchar_t addr_method;
  87
  88                 /* Get lun property */
  89                 if ((di_prop_lookup_int64(DDI_DEV_T_ANY, node,
  90                     SCSI_ADDR_PROP_LUN64, &lun64p) > 0) &&
  91                     (*lun64p != SCSI_LUN64_ILLEGAL)) {
  92                         lun64 = *lun64p;
  93                 } else if (di_prop_lookup_ints(DDI_DEV_T_ANY, node,
  94                     SCSI_ADDR_PROP_LUN, &intp) > 0) {
  95                         lun64 = (uint64_t)*intp;
  96                 }
  97
  98                 lun = scsi_lun64_to_lun(lun64);
  99
 100                 addr_method = (lun.sl_lun1_msb & SCSI_LUN_AM_MASK);
 101
 102                 (void) scsi_wwnstr_to_wwn(tgt_port, &wwn);
 103                 if ((addr_method == SCSI_LUN_AM_PDEV) &&
 104                     (lun.sl_lun2_msb == 0) && (lun.sl_lun2_lsb == 0) &&
 105                     (lun.sl_lun3_msb == 0) && (lun.sl_lun3_lsb == 0) &&
 106                     (lun.sl_lun4_msb == 0) && (lun.sl_lun4_lsb == 0)) {
 107                         (void) snprintf(lpath, PATH_MAX,
 108                             "%s/%s/c%st%"PRIX64"d%"PRId64, SGEN_DIR,
 109                             di_minor_name(minor), cnum, wwn, lun64);
 110                 } else if ((addr_method == SCSI_LUN_AM_FLAT) &&
 111                     (lun.sl_lun2_msb == 0) && (lun.sl_lun2_lsb == 0) &&
 112                     (lun.sl_lun3_msb == 0) && (lun.sl_lun3_lsb == 0) &&
 113                     (lun.sl_lun4_msb == 0) && (lun.sl_lun4_lsb == 0)) {
 114                         sl = (lun.sl_lun1_msb << 8) | lun.sl_lun1_lsb;
 115                         (void) snprintf(lpath, PATH_MAX,
 116                             "%s/%s/c%st%"PRIX64"d%"PRIX16, SGEN_DIR,
 117                             di_minor_name(minor), cnum, wwn, sl);
 118                 } else {
 119                         (void) snprintf(lpath, PATH_MAX,
 120                             "%s/%s/c%st%"PRIX64"d%"PRIX64, SGEN_DIR,
 121                             di_minor_name(minor), cnum, wwn, lun64);
 122                 }
 123         } else if (di_prop_lookup_strings(DDI_DEV_T_ANY, node,
 124             "client-guid", (char **)&wwnstr) > 0) {
 125                 /*
 126                  * MPXIO-enabled devices; lun is always 0.
 127                  */
 128                 if (strlcpy((char *)buf, (char *)wwnstr, sizeof (buf)) >=
 129                     sizeof (buf))
 130                         goto done;
 131
 132                 for (tstr = buf; *tstr != '\0'; tstr++) {
 133                         *tstr = toupper(*tstr);
 134                 }
 135                 if (snprintf(lpath, sizeof (lpath), "%s/%s/c%st%sd0", SGEN_DIR,
 136                     di_minor_name(minor), cnum, buf) >= sizeof (lpath))
 137                         goto done;
 138
 139         } else if (di_prop_lookup_bytes(DDI_DEV_T_ANY, node,
 140             "port-wwn", &wwnstr) == 8) {
 141                 /*
 142                  * "normal" fibre channel devices
 143                  */
 144                 int lun, *lunp, count;
 145                 if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, "lun", &lunp) > 0)
 146                         lun = *lunp;
 147                 else
 148                         lun = 0;
 149
 150                 for (count = 0, tstr = buf; count < 8; count++, tstr += 2)
 151                         (void) sprintf(tstr, "%02X", wwnstr[count]);
 152
 153                 *tstr = '\0';
 154                 if (snprintf(lpath, sizeof (lpath), "%s/%s/c%st%sd%d", SGEN_DIR,
 155                     di_minor_name(minor), cnum, buf, lun) >= sizeof (lpath))
 156                         goto done;
 157         } else {
 158                 /*
 159                  * Parallel SCSI devices
 160                  */
 161                 uint_t targ, lun;
 162
 163                 if ((baddr = di_bus_addr(node)) == NULL)
 164                         goto done;
 165
 166                 if (sscanf(baddr, "%X,%X", &targ, &lun) != 2)
 167                         goto done;
 168
 169                 if (snprintf(lpath, sizeof (lpath), "%s/%s/c%st%dd%d", SGEN_DIR,
 170                     di_minor_name(minor), cnum, targ, lun) >= sizeof (lpath))
 171                         goto done;
 172         }
 173
 174         (void) devfsadm_mklink(lpath, node, minor, 0);
 175 done:
 176         free(cnum);
 177         return (DEVFSADM_CONTINUE);
 178 }
 179
 180 /* index of enumeration rule applicable to this module */
 181 #define RULE_INDEX      2
 182
 183 static char *
 184 find_ctrlr(di_node_t node, di_minor_t minor)
 185 {
 186         char path[PATH_MAX + 1];
 187         char *devfspath;
 188         char *buf, *mn;
 189
 190         devfsadm_enumerate_t rules[3] = {
 191             {"^r?dsk$/^c([0-9]+)", 1, MATCH_PARENT},
 192             {"^cfg$/^c([0-9]+)$", 1, MATCH_ADDR},
 193             {"^scsi$/^.+$/^c([0-9]+)", 1, MATCH_PARENT}
 194         };
 195
 196         mn = di_minor_name(minor);
 197
 198         if ((devfspath = di_devfs_path(node)) == NULL) {
 199                 return (NULL);
 200         }
 201         (void) strcpy(path, devfspath);
 202         (void) strcat(path, ":");
 203         (void) strcat(path, mn);
 204         di_devfs_path_free(devfspath);
 205
 206         /*
 207          * Use controller (parent) component of device path
 208          */
 209         if (disk_enumerate_int(path, RULE_INDEX, &buf, rules, 3) ==
 210             DEVFSADM_MULTIPLE) {
 211
 212                 /*
 213                  * We failed because there are multiple logical controller
 214                  * numbers for a single physical controller.  If we use node
 215                  * name also for DEVICE paths in the match it should fix this
 216                  * and only find one logical controller. (See 4045879).
 217                  * NOTE: Rules for controllers are not changed, as there is
 218                  * no unique controller number for them in this case.
 219                  *
 220                  * MATCH_UNCACHED flag is private to the "disks" and "sgen"
 221                  * modules. NOT to be used by other modules.
 222                  */
 223                 rules[0].flags = MATCH_NODE | MATCH_UNCACHED; /* disks */
 224                 rules[2].flags = MATCH_NODE | MATCH_UNCACHED; /* generic scsi */
 225                 if (devfsadm_enumerate_int(path, RULE_INDEX, &buf, rules, 3)) {
 226                         return (NULL);
 227                 }
 228         }
 229
 230         return (buf);
 231 }