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                         sas_destruct_devices(port);
  70                         continue;
  71                 }
  72
  73                 if (dev->dev_type == SAS_EDGE_EXPANDER_DEVICE || dev->dev_type == SAS_FANOUT_EXPANDER_DEVICE) {
  74                         dev->ex_dev.ex_change_count = -1;
  75                         for (i = 0; i < dev->ex_dev.num_phys; i++) {
  76                                 struct ex_phy *phy = &dev->ex_dev.ex_phy[i];
  77
  78                                 phy->phy_change_count = -1;
  79                         }
  80                 }
  81         }
  82
  83         sas_discover_event(port, DISCE_RESUME);
  84 }
  85
  86 /**
  87  * sas_form_port - add this phy to a port
  88  * @phy: the phy of interest
  89  *
  90  * This function adds this phy to an existing port, thus creating a wide
  91  * port, or it creates a port and adds the phy to the port.
  92  */
  93 static void sas_form_port(struct asd_sas_phy *phy)
  94 {
  95         int i;
  96         struct sas_ha_struct *sas_ha = phy->ha;
  97         struct asd_sas_port *port = phy->port;
  98         struct sas_internal *si =
  99                 to_sas_internal(sas_ha->core.shost->transportt);
 100         unsigned long flags;
 101
 102         if (port) {
 103                 if (!phy_is_wideport_member(port, phy))
 104                         sas_deform_port(phy, 0);
 105                 else if (phy->suspended) {
 106                         phy->suspended = 0;
 107                         sas_resume_port(phy);
 108
 109                         /* phy came back, try to cancel the timeout */
 110                         wake_up(&sas_ha->eh_wait_q);
 111                         return;
 112                 } else {
 113                         SAS_DPRINTK("%s: phy%d belongs to port%d already(%d)!\n",
 114                                     __func__, phy->id, phy->port->id,
 115                                     phy->port->num_phys);
 116                         return;
 117                 }
 118         }
 119
 120         /* see if the phy should be part of a wide port */
 121         spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
 122         for (i = 0; i < sas_ha->num_phys; i++) {
 123                 port = sas_ha->sas_port[i];
 124                 spin_lock(&port->phy_list_lock);
 125                 if (*(u64 *) port->sas_addr &&
 126                     phy_is_wideport_member(port, phy) && port->num_phys > 0) {
 127                         /* wide port */
 128                         SAS_DPRINTK("phy%d matched wide port%d\n", phy->id,
 129                                     port->id);
 130                         break;
 131                 }
 132                 spin_unlock(&port->phy_list_lock);
 133         }
 134         /* The phy does not match any existing port, create a new one */
 135         if (i == sas_ha->num_phys) {
 136                 for (i = 0; i < sas_ha->num_phys; i++) {
 137                         port = sas_ha->sas_port[i];
 138                         spin_lock(&port->phy_list_lock);
 139                         if (*(u64 *)port->sas_addr == 0
 140                                 && port->num_phys == 0) {
 141                                 memcpy(port->sas_addr, phy->sas_addr,
 142                                         SAS_ADDR_SIZE);
 143                                 break;
 144                         }
 145                         spin_unlock(&port->phy_list_lock);
 146                 }
 147         }
 148
 149         if (i >= sas_ha->num_phys) {
 150                 printk(KERN_NOTICE "%s: couldn't find a free port, bug?\n",
 151                        __func__);
 152                 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
 153                 return;
 154         }
 155
 156         /* add the phy to the port */
 157         list_add_tail(&phy->port_phy_el, &port->phy_list);
 158         sas_phy_set_target(phy, port->port_dev);
 159         phy->port = port;
 160         port->num_phys++;
 161         port->phy_mask |= (1U << phy->id);
 162
 163         if (*(u64 *)port->attached_sas_addr == 0) {
 164                 port->class = phy->class;
 165                 memcpy(port->attached_sas_addr, phy->attached_sas_addr,
 166                        SAS_ADDR_SIZE);
 167                 port->iproto = phy->iproto;
 168                 port->tproto = phy->tproto;
 169                 port->oob_mode = phy->oob_mode;
 170                 port->linkrate = phy->linkrate;
 171         } else
 172                 port->linkrate = max(port->linkrate, phy->linkrate);
 173         spin_unlock(&port->phy_list_lock);
 174         spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
 175
 176         if (!port->port) {
 177                 port->port = sas_port_alloc(phy->phy->dev.parent, port->id);
 178                 BUG_ON(!port->port);
 179                 sas_port_add(port->port);
 180         }
 181         sas_port_add_phy(port->port, phy->phy);
 182
 183         SAS_DPRINTK("%s added to %s, phy_mask:0x%x (%16llx)\n",
 184                     dev_name(&phy->phy->dev), dev_name(&port->port->dev),
 185                     port->phy_mask,
 186                     SAS_ADDR(port->attached_sas_addr));
 187
 188         if (port->port_dev)
 189                 port->port_dev->pathways = port->num_phys;
 190
 191         /* Tell the LLDD about this port formation. */
 192         if (si->dft->lldd_port_formed)
 193                 si->dft->lldd_port_formed(phy);
 194
 195         sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN);
 196         flush_workqueue(sas_ha->disco_q);
 197 }
 198
 199 /**
 200  * sas_deform_port - remove this phy from the port it belongs to
 201  * @phy: the phy of interest
 202  * @gone: whether or not the PHY is gone
 203  *
 204  * This is called when the physical link to the other phy has been
 205  * lost (on this phy), in Event thread context. We cannot delay here.
 206  */
 207 void sas_deform_port(struct asd_sas_phy *phy, int gone)
 208 {
 209         struct sas_ha_struct *sas_ha = phy->ha;
 210         struct asd_sas_port *port = phy->port;
 211         struct sas_internal *si =
 212                 to_sas_internal(sas_ha->core.shost->transportt);
 213         struct domain_device *dev;
 214         unsigned long flags;
 215
 216         if (!port)
 217                 return;           /* done by a phy event */
 218
 219         dev = port->port_dev;
 220         if (dev)
 221                 dev->pathways--;
 222
 223         if (port->num_phys == 1) {
 224                 sas_unregister_domain_devices(port, gone);
 225                 sas_destruct_devices(port);
 226                 sas_port_delete(port->port);
 227                 port->port = NULL;
 228         } else {
 229                 sas_port_delete_phy(port->port, phy->phy);
 230                 sas_device_set_phy(dev, port->port);
 231         }
 232
 233         if (si->dft->lldd_port_deformed)
 234                 si->dft->lldd_port_deformed(phy);
 235
 236         spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
 237         spin_lock(&port->phy_list_lock);
 238
 239         list_del_init(&phy->port_phy_el);
 240         sas_phy_set_target(phy, NULL);
 241         phy->port = NULL;
 242         port->num_phys--;
 243         port->phy_mask &= ~(1U << phy->id);
 244
 245         if (port->num_phys == 0) {
 246                 INIT_LIST_HEAD(&port->phy_list);
 247                 memset(port->sas_addr, 0, SAS_ADDR_SIZE);
 248                 memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE);
 249                 port->class = 0;
 250                 port->iproto = 0;
 251                 port->tproto = 0;
 252                 port->oob_mode = 0;
 253                 port->phy_mask = 0;
 254         }
 255         spin_unlock(&port->phy_list_lock);
 256         spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
 257
 258         return;
 259 }
 260
 261 /* ---------- SAS port events ---------- */
 262
 263 void sas_porte_bytes_dmaed(struct work_struct *work)
 264 {
 265         struct asd_sas_event *ev = to_asd_sas_event(work);
 266         struct asd_sas_phy *phy = ev->phy;
 267
 268         sas_form_port(phy);
 269 }
 270
 271 void sas_porte_broadcast_rcvd(struct work_struct *work)
 272 {
 273         struct asd_sas_event *ev = to_asd_sas_event(work);
 274         struct asd_sas_phy *phy = ev->phy;
 275         unsigned long flags;
 276         u32 prim;
 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         if (phy->port)
 286                 flush_workqueue(phy->port->ha->disco_q);
 287 }
 288
 289 void sas_porte_link_reset_err(struct work_struct *work)
 290 {
 291         struct asd_sas_event *ev = to_asd_sas_event(work);
 292         struct asd_sas_phy *phy = ev->phy;
 293
 294         sas_deform_port(phy, 1);
 295 }
 296
 297 void sas_porte_timer_event(struct work_struct *work)
 298 {
 299         struct asd_sas_event *ev = to_asd_sas_event(work);
 300         struct asd_sas_phy *phy = ev->phy;
 301
 302         sas_deform_port(phy, 1);
 303 }
 304
 305 void sas_porte_hard_reset(struct work_struct *work)
 306 {
 307         struct asd_sas_event *ev = to_asd_sas_event(work);
 308         struct asd_sas_phy *phy = ev->phy;
 309
 310         sas_deform_port(phy, 1);
 311 }
 312
 313 /* ---------- SAS port registration ---------- */
 314
 315 static void sas_init_port(struct asd_sas_port *port,
 316                           struct sas_ha_struct *sas_ha, int i)
 317 {
 318         memset(port, 0, sizeof(*port));
 319         port->id = i;
 320         INIT_LIST_HEAD(&port->dev_list);
 321         INIT_LIST_HEAD(&port->disco_list);
 322         INIT_LIST_HEAD(&port->destroy_list);
 323         INIT_LIST_HEAD(&port->sas_port_del_list);
 324         spin_lock_init(&port->phy_list_lock);
 325         INIT_LIST_HEAD(&port->phy_list);
 326         port->ha = sas_ha;
 327
 328         spin_lock_init(&port->dev_list_lock);
 329 }
 330
 331 int sas_register_ports(struct sas_ha_struct *sas_ha)
 332 {
 333         int i;
 334
 335         /* initialize the ports and discovery */
 336         for (i = 0; i < sas_ha->num_phys; i++) {
 337                 struct asd_sas_port *port = sas_ha->sas_port[i];
 338
 339                 sas_init_port(port, sas_ha, i);
 340                 sas_init_disc(&port->disc, port);
 341         }
 342         return 0;
 343 }
 344
 345 void sas_unregister_ports(struct sas_ha_struct *sas_ha)
 346 {
 347         int i;
 348
 349         for (i = 0; i < sas_ha->num_phys; i++)
 350                 if (sas_ha->sas_phy[i]->port)
 351                         sas_deform_port(sas_ha->sas_phy[i], 0);
 352
 353 }
 354
 355 const work_func_t sas_port_event_fns[PORT_NUM_EVENTS] = {
 356         [PORTE_BYTES_DMAED] = sas_porte_bytes_dmaed,
 357         [PORTE_BROADCAST_RCVD] = sas_porte_broadcast_rcvd,
 358         [PORTE_LINK_RESET_ERR] = sas_porte_link_reset_err,
 359         [PORTE_TIMER_EVENT] = sas_porte_timer_event,
 360         [PORTE_HARD_RESET] = sas_porte_hard_reset,
 361 };