drivers/scsi/libsas/sas_port.c

   1 /*
   2  * Serial Attached SCSI (SAS) Port class
   3  *
   4  * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
   5  * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
   6  *
   7  * This file is licensed under GPLv2.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of the
  12  * License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  22  *
  23  */
  24
  25 #include "sas_internal.h"
  26
  27 #include <scsi/scsi_transport.h>
  28 #include <scsi/scsi_transport_sas.h>
  29 #include "../scsi_sas_internal.h"
  30
  31 static bool phy_is_wideport_member(struct asd_sas_port *port, struct asd_sas_phy *phy)
  32 {
  33         struct sas_ha_struct *sas_ha = phy->ha;
  34
  35         if (memcmp(port->attached_sas_addr, phy->attached_sas_addr,
  36                    SAS_ADDR_SIZE) != 0 || (sas_ha->strict_wide_ports &&
  37              memcmp(port->sas_addr, phy->sas_addr, SAS_ADDR_SIZE) != 0))
  38                 return false;
  39         return true;
  40 }
  41
  42 static void sas_resume_port(struct asd_sas_phy *phy)
  43 {
  44         struct domain_device *dev;
  45         struct asd_sas_port *port = phy->port;
  46         struct sas_ha_struct *sas_ha = phy->ha;
  47         struct sas_internal *si = to_sas_internal(sas_ha->core.shost->transportt);
  48
  49         if (si->dft->lldd_port_formed)
  50                 si->dft->lldd_port_formed(phy);
  51
  52         if (port->suspended)
  53                 port->suspended = 0;
  54         else {
  55                 /* we only need to handle "link returned" actions once */
  56                 return;
  57         }
  58
  59         /* if the port came back:
  60          * 1/ presume every device came back
  61          * 2/ force the next revalidation to check all expander phys
  62          */
  63         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
  64                 int i, rc;
  65
  66                 rc = sas_notify_lldd_dev_found(dev);
  67                 if (rc) {
  68                         sas_unregister_dev(port, dev);
  69                         continue;
  70                 }
  71
  72                 if (dev->dev_type == SAS_EDGE_EXPANDER_DEVICE || dev->dev_type == SAS_FANOUT_EXPANDER_DEVICE) {
  73                         dev->ex_dev.ex_change_count = -1;
  74                         for (i = 0; i < dev->ex_dev.num_phys; i++) {
  75                                 struct ex_phy *phy = &dev->ex_dev.ex_phy[i];
  76
  77                                 phy->phy_change_count = -1;
  78                         }
  79                 }
  80         }
  81
  82         sas_discover_event(port, DISCE_RESUME);
  83 }
  84
  85 /**
  86  * sas_form_port -- add this phy to a port
  87  * @phy: the phy of interest
  88  *
  89  * This function adds this phy to an existing port, thus creating a wide
  90  * port, or it creates a port and adds the phy to the port.
  91  */
  92 static void sas_form_port(struct asd_sas_phy *phy)
  93 {
  94         int i;
  95         struct sas_ha_struct *sas_ha = phy->ha;
  96         struct asd_sas_port *port = phy->port;
  97         struct sas_internal *si =
  98                 to_sas_internal(sas_ha->core.shost->transportt);
  99         unsigned long flags;
 100
 101         if (port) {
 102                 if (!phy_is_wideport_member(port, phy))
 103                         sas_deform_port(phy, 0);
 104                 else if (phy->suspended) {
 105                         phy->suspended = 0;
 106                         sas_resume_port(phy);
 107
 108                         /* phy came back, try to cancel the timeout */
 109                         wake_up(&sas_ha->eh_wait_q);
 110                         return;
 111                 } else {
 112                         SAS_DPRINTK("%s: phy%d belongs to port%d already(%d)!\n",
 113                                     __func__, phy->id, phy->port->id,
 114                                     phy->port->num_phys);
 115                         return;
 116                 }
 117         }
 118
 119         /* see if the phy should be part of a wide port */
 120         spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
 121         for (i = 0; i < sas_ha->num_phys; i++) {
 122                 port = sas_ha->sas_port[i];
 123                 spin_lock(&port->phy_list_lock);
 124                 if (*(u64 *) port->sas_addr &&
 125                     phy_is_wideport_member(port, phy) && port->num_phys > 0) {
 126                         /* wide port */
 127                         SAS_DPRINTK("phy%d matched wide port%d\n", phy->id,
 128                                     port->id);
 129                         break;
 130                 }
 131                 spin_unlock(&port->phy_list_lock);
 132         }
 133         /* The phy does not match any existing port, create a new one */
 134         if (i == sas_ha->num_phys) {
 135                 for (i = 0; i < sas_ha->num_phys; i++) {
 136                         port = sas_ha->sas_port[i];
 137                         spin_lock(&port->phy_list_lock);
 138                         if (*(u64 *)port->sas_addr == 0
 139                                 && port->num_phys == 0) {
 140                                 memcpy(port->sas_addr, phy->sas_addr,
 141                                         SAS_ADDR_SIZE);
 142                                 break;
 143                         }
 144                         spin_unlock(&port->phy_list_lock);
 145                 }
 146         }
 147
 148         if (i >= sas_ha->num_phys) {
 149                 printk(KERN_NOTICE "%s: couldn't find a free port, bug?\n",
 150                        __func__);
 151                 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
 152                 return;
 153         }
 154
 155         /* add the phy to the port */
 156         list_add_tail(&phy->port_phy_el, &port->phy_list);
 157         sas_phy_set_target(phy, port->port_dev);
 158         phy->port = port;
 159         port->num_phys++;
 160         port->phy_mask |= (1U << phy->id);
 161
 162         if (*(u64 *)port->attached_sas_addr == 0) {
 163                 port->class = phy->class;
 164                 memcpy(port->attached_sas_addr, phy->attached_sas_addr,
 165                        SAS_ADDR_SIZE);
 166                 port->iproto = phy->iproto;
 167                 port->tproto = phy->tproto;
 168                 port->oob_mode = phy->oob_mode;
 169                 port->linkrate = phy->linkrate;
 170         } else
 171                 port->linkrate = max(port->linkrate, phy->linkrate);
 172         spin_unlock(&port->phy_list_lock);
 173         spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
 174
 175         if (!port->port) {
 176                 port->port = sas_port_alloc(phy->phy->dev.parent, port->id);
 177                 BUG_ON(!port->port);
 178                 sas_port_add(port->port);
 179         }
 180         sas_port_add_phy(port->port, phy->phy);
 181
 182         SAS_DPRINTK("%s added to %s, phy_mask:0x%x (%16llx)\n",
 183                     dev_name(&phy->phy->dev), dev_name(&port->port->dev),
 184                     port->phy_mask,
 185                     SAS_ADDR(port->attached_sas_addr));
 186
 187         if (port->port_dev)
 188                 port->port_dev->pathways = port->num_phys;
 189
 190         /* Tell the LLDD about this port formation. */
 191         if (si->dft->lldd_port_formed)
 192                 si->dft->lldd_port_formed(phy);
 193
 194         sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN);
 195 }
 196
 197 /**
 198  * sas_deform_port -- remove this phy from the port it belongs to
 199  * @phy: the phy of interest
 200  *
 201  * This is called when the physical link to the other phy has been
 202  * lost (on this phy), in Event thread context. We cannot delay here.
 203  */
 204 void sas_deform_port(struct asd_sas_phy *phy, int gone)
 205 {
 206         struct sas_ha_struct *sas_ha = phy->ha;
 207         struct asd_sas_port *port = phy->port;
 208         struct sas_internal *si =
 209                 to_sas_internal(sas_ha->core.shost->transportt);
 210         struct domain_device *dev;
 211         unsigned long flags;
 212
 213         if (!port)
 214                 return;           /* done by a phy event */
 215
 216         dev = port->port_dev;
 217         if (dev)
 218                 dev->pathways--;
 219
 220         if (port->num_phys == 1) {
 221                 sas_unregister_domain_devices(port, gone);
 222                 sas_port_delete(port->port);
 223                 port->port = NULL;
 224         } else {
 225                 sas_port_delete_phy(port->port, phy->phy);
 226                 sas_device_set_phy(dev, port->port);
 227         }
 228
 229         if (si->dft->lldd_port_deformed)
 230                 si->dft->lldd_port_deformed(phy);
 231
 232         spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
 233         spin_lock(&port->phy_list_lock);
 234
 235         list_del_init(&phy->port_phy_el);
 236         sas_phy_set_target(phy, NULL);
 237         phy->port = NULL;
 238         port->num_phys--;
 239         port->phy_mask &= ~(1U << phy->id);
 240
 241         if (port->num_phys == 0) {
 242                 INIT_LIST_HEAD(&port->phy_list);
 243                 memset(port->sas_addr, 0, SAS_ADDR_SIZE);
 244                 memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE);
 245                 port->class = 0;
 246                 port->iproto = 0;
 247                 port->tproto = 0;
 248                 port->oob_mode = 0;
 249                 port->phy_mask = 0;
 250         }
 251         spin_unlock(&port->phy_list_lock);
 252         spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
 253
 254         return;
 255 }
 256
 257 /* ---------- SAS port events ---------- */
 258
 259 void sas_porte_bytes_dmaed(struct work_struct *work)
 260 {
 261         struct asd_sas_event *ev = to_asd_sas_event(work);
 262         struct asd_sas_phy *phy = ev->phy;
 263
 264         clear_bit(PORTE_BYTES_DMAED, &phy->port_events_pending);
 265
 266         sas_form_port(phy);
 267 }
 268
 269 void sas_porte_broadcast_rcvd(struct work_struct *work)
 270 {
 271         struct asd_sas_event *ev = to_asd_sas_event(work);
 272         struct asd_sas_phy *phy = ev->phy;
 273         unsigned long flags;
 274         u32 prim;
 275
 276         clear_bit(PORTE_BROADCAST_RCVD, &phy->port_events_pending);
 277
 278         spin_lock_irqsave(&phy->sas_prim_lock, flags);
 279         prim = phy->sas_prim;
 280         spin_unlock_irqrestore(&phy->sas_prim_lock, flags);
 281
 282         SAS_DPRINTK("broadcast received: %d\n", prim);
 283         sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN);
 284 }
 285
 286 void sas_porte_link_reset_err(struct work_struct *work)
 287 {
 288         struct asd_sas_event *ev = to_asd_sas_event(work);
 289         struct asd_sas_phy *phy = ev->phy;
 290
 291         clear_bit(PORTE_LINK_RESET_ERR, &phy->port_events_pending);
 292
 293         sas_deform_port(phy, 1);
 294 }
 295
 296 void sas_porte_timer_event(struct work_struct *work)
 297 {
 298         struct asd_sas_event *ev = to_asd_sas_event(work);
 299         struct asd_sas_phy *phy = ev->phy;
 300
 301         clear_bit(PORTE_TIMER_EVENT, &phy->port_events_pending);
 302
 303         sas_deform_port(phy, 1);
 304 }
 305
 306 void sas_porte_hard_reset(struct work_struct *work)
 307 {
 308         struct asd_sas_event *ev = to_asd_sas_event(work);
 309         struct asd_sas_phy *phy = ev->phy;
 310
 311         clear_bit(PORTE_HARD_RESET, &phy->port_events_pending);
 312
 313         sas_deform_port(phy, 1);
 314 }
 315
 316 /* ---------- SAS port registration ---------- */
 317
 318 static void sas_init_port(struct asd_sas_port *port,
 319                           struct sas_ha_struct *sas_ha, int i)
 320 {
 321         memset(port, 0, sizeof(*port));
 322         port->id = i;
 323         INIT_LIST_HEAD(&port->dev_list);
 324         INIT_LIST_HEAD(&port->disco_list);
 325         INIT_LIST_HEAD(&port->destroy_list);
 326         spin_lock_init(&port->phy_list_lock);
 327         INIT_LIST_HEAD(&port->phy_list);
 328         port->ha = sas_ha;
 329
 330         spin_lock_init(&port->dev_list_lock);
 331 }
 332
 333 int sas_register_ports(struct sas_ha_struct *sas_ha)
 334 {
 335         int i;
 336
 337         /* initialize the ports and discovery */
 338         for (i = 0; i < sas_ha->num_phys; i++) {
 339                 struct asd_sas_port *port = sas_ha->sas_port[i];
 340
 341                 sas_init_port(port, sas_ha, i);
 342                 sas_init_disc(&port->disc, port);
 343         }
 344         return 0;
 345 }
 346
 347 void sas_unregister_ports(struct sas_ha_struct *sas_ha)
 348 {
 349         int i;
 350
 351         for (i = 0; i < sas_ha->num_phys; i++)
 352                 if (sas_ha->sas_phy[i]->port)
 353                         sas_deform_port(sas_ha->sas_phy[i], 0);
 354
 355 }