drivers/scsi/libsas/sas_port.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Serial Attached SCSI (SAS) Port class
   4  *
   5  * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
   6  * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
   7  */
   8
   9 #include "sas_internal.h"
  10
  11 #include <scsi/scsi_transport.h>
  12 #include <scsi/scsi_transport_sas.h>
  13 #include "scsi_sas_internal.h"
  14
  15 static bool phy_is_wideport_member(struct asd_sas_port *port, struct asd_sas_phy *phy)
  16 {
  17         struct sas_ha_struct *sas_ha = phy->ha;
  18
  19         if (memcmp(port->attached_sas_addr, phy->attached_sas_addr,
  20                    SAS_ADDR_SIZE) != 0 || (sas_ha->strict_wide_ports &&
  21              memcmp(port->sas_addr, phy->sas_addr, SAS_ADDR_SIZE) != 0))
  22                 return false;
  23         return true;
  24 }
  25
  26 static void sas_resume_port(struct asd_sas_phy *phy)
  27 {
  28         struct domain_device *dev, *n;
  29         struct asd_sas_port *port = phy->port;
  30         struct sas_ha_struct *sas_ha = phy->ha;
  31         struct sas_internal *si = to_sas_internal(sas_ha->shost->transportt);
  32
  33         if (si->dft->lldd_port_formed)
  34                 si->dft->lldd_port_formed(phy);
  35
  36         if (port->suspended)
  37                 port->suspended = 0;
  38         else {
  39                 /* we only need to handle "link returned" actions once */
  40                 return;
  41         }
  42
  43         /* if the port came back:
  44          * 1/ presume every device came back
  45          * 2/ force the next revalidation to check all expander phys
  46          */
  47         list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) {
  48                 int i, rc;
  49
  50                 rc = sas_notify_lldd_dev_found(dev);
  51                 if (rc) {
  52                         sas_unregister_dev(port, dev);
  53                         sas_destruct_devices(port);
  54                         continue;
  55                 }
  56
  57                 if (dev_is_expander(dev->dev_type)) {
  58                         dev->ex_dev.ex_change_count = -1;
  59                         for (i = 0; i < dev->ex_dev.num_phys; i++) {
  60                                 struct ex_phy *phy = &dev->ex_dev.ex_phy[i];
  61
  62                                 phy->phy_change_count = -1;
  63                         }
  64                 }
  65         }
  66
  67         sas_discover_event(port, DISCE_RESUME);
  68 }
  69
  70 static void sas_form_port_add_phy(struct asd_sas_port *port,
  71                                   struct asd_sas_phy *phy, bool wideport)
  72 {
  73         list_add_tail(&phy->port_phy_el, &port->phy_list);
  74         sas_phy_set_target(phy, port->port_dev);
  75         phy->port = port;
  76         port->num_phys++;
  77         port->phy_mask |= (1U << phy->id);
  78
  79         if (wideport)
  80                 pr_debug("phy%d matched wide port%d\n", phy->id,
  81                          port->id);
  82         else
  83                 memcpy(port->sas_addr, phy->sas_addr, SAS_ADDR_SIZE);
  84
  85         if (*(u64 *)port->attached_sas_addr == 0) {
  86                 memcpy(port->attached_sas_addr, phy->attached_sas_addr,
  87                        SAS_ADDR_SIZE);
  88                 port->iproto = phy->iproto;
  89                 port->tproto = phy->tproto;
  90                 port->oob_mode = phy->oob_mode;
  91                 port->linkrate = phy->linkrate;
  92         } else {
  93                 port->linkrate = max(port->linkrate, phy->linkrate);
  94         }
  95 }
  96
  97 /**
  98  * sas_form_port - add this phy to a port
  99  * @phy: the phy of interest
 100  *
 101  * This function adds this phy to an existing port, thus creating a wide
 102  * port, or it creates a port and adds the phy to the port.
 103  */
 104 static void sas_form_port(struct asd_sas_phy *phy)
 105 {
 106         int i;
 107         struct sas_ha_struct *sas_ha = phy->ha;
 108         struct asd_sas_port *port = phy->port;
 109         struct domain_device *port_dev = NULL;
 110         struct sas_internal *si =
 111                 to_sas_internal(sas_ha->shost->transportt);
 112         unsigned long flags;
 113
 114         if (port) {
 115                 if (!phy_is_wideport_member(port, phy))
 116                         sas_deform_port(phy, 0);
 117                 else if (phy->suspended) {
 118                         phy->suspended = 0;
 119                         sas_resume_port(phy);
 120
 121                         /* phy came back, try to cancel the timeout */
 122                         wake_up(&sas_ha->eh_wait_q);
 123                         return;
 124                 } else {
 125                         pr_info("%s: phy%d belongs to port%d already(%d)!\n",
 126                                 __func__, phy->id, phy->port->id,
 127                                 phy->port->num_phys);
 128                         return;
 129                 }
 130         }
 131
 132         /* see if the phy should be part of a wide port */
 133         spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
 134         for (i = 0; i < sas_ha->num_phys; i++) {
 135                 port = sas_ha->sas_port[i];
 136                 spin_lock(&port->phy_list_lock);
 137                 if (*(u64 *) port->sas_addr &&
 138                     phy_is_wideport_member(port, phy) && port->num_phys > 0) {
 139                         /* wide port */
 140                         port_dev = port->port_dev;
 141                         sas_form_port_add_phy(port, phy, true);
 142                         spin_unlock(&port->phy_list_lock);
 143                         break;
 144                 }
 145                 spin_unlock(&port->phy_list_lock);
 146         }
 147         /* The phy does not match any existing port, create a new one */
 148         if (i == sas_ha->num_phys) {
 149                 for (i = 0; i < sas_ha->num_phys; i++) {
 150                         port = sas_ha->sas_port[i];
 151                         spin_lock(&port->phy_list_lock);
 152                         if (*(u64 *)port->sas_addr == 0
 153                             && port->num_phys == 0) {
 154                                 port_dev = port->port_dev;
 155                                 sas_form_port_add_phy(port, phy, false);
 156                                 spin_unlock(&port->phy_list_lock);
 157                                 break;
 158                         }
 159                         spin_unlock(&port->phy_list_lock);
 160                 }
 161
 162                 if (i >= sas_ha->num_phys) {
 163                         pr_err("%s: couldn't find a free port, bug?\n",
 164                                __func__);
 165                         spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
 166                         return;
 167                 }
 168         }
 169         spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
 170
 171         if (!port->port) {
 172                 port->port = sas_port_alloc(phy->phy->dev.parent, port->id);
 173                 BUG_ON(!port->port);
 174                 sas_port_add(port->port);
 175         }
 176         sas_port_add_phy(port->port, phy->phy);
 177
 178         pr_debug("%s added to %s, phy_mask:0x%x (%016llx)\n",
 179                  dev_name(&phy->phy->dev), dev_name(&port->port->dev),
 180                  port->phy_mask,
 181                  SAS_ADDR(port->attached_sas_addr));
 182
 183         if (port_dev)
 184                 port_dev->pathways = port->num_phys;
 185
 186         /* Tell the LLDD about this port formation. */
 187         if (si->dft->lldd_port_formed)
 188                 si->dft->lldd_port_formed(phy);
 189
 190         sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN);
 191         /* Only insert a revalidate event after initial discovery */
 192         if (port_dev && dev_is_expander(port_dev->dev_type)) {
 193                 struct expander_device *ex_dev = &port_dev->ex_dev;
 194
 195                 ex_dev->ex_change_count = -1;
 196                 sas_discover_event(port, DISCE_REVALIDATE_DOMAIN);
 197         }
 198         flush_workqueue(sas_ha->disco_q);
 199 }
 200
 201 /**
 202  * sas_deform_port - remove this phy from the port it belongs to
 203  * @phy: the phy of interest
 204  * @gone: whether or not the PHY is gone
 205  *
 206  * This is called when the physical link to the other phy has been
 207  * lost (on this phy), in Event thread context. We cannot delay here.
 208  */
 209 void sas_deform_port(struct asd_sas_phy *phy, int gone)
 210 {
 211         struct sas_ha_struct *sas_ha = phy->ha;
 212         struct asd_sas_port *port = phy->port;
 213         struct sas_internal *si =
 214                 to_sas_internal(sas_ha->shost->transportt);
 215         struct domain_device *dev;
 216         unsigned long flags;
 217
 218         if (!port)
 219                 return;           /* done by a phy event */
 220
 221         dev = port->port_dev;
 222         if (dev)
 223                 dev->pathways--;
 224
 225         if (port->num_phys == 1) {
 226                 sas_unregister_domain_devices(port, gone);
 227                 sas_destruct_devices(port);
 228                 sas_port_delete(port->port);
 229                 port->port = NULL;
 230         } else {
 231                 sas_port_delete_phy(port->port, phy->phy);
 232                 sas_device_set_phy(dev, port->port);
 233         }
 234
 235         if (si->dft->lldd_port_deformed)
 236                 si->dft->lldd_port_deformed(phy);
 237
 238         spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
 239         spin_lock(&port->phy_list_lock);
 240
 241         list_del_init(&phy->port_phy_el);
 242         sas_phy_set_target(phy, NULL);
 243         phy->port = NULL;
 244         port->num_phys--;
 245         port->phy_mask &= ~(1U << phy->id);
 246
 247         if (port->num_phys == 0) {
 248                 INIT_LIST_HEAD(&port->phy_list);
 249                 memset(port->sas_addr, 0, SAS_ADDR_SIZE);
 250                 memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE);
 251                 port->iproto = 0;
 252                 port->tproto = 0;
 253                 port->oob_mode = 0;
 254                 port->phy_mask = 0;
 255         }
 256         spin_unlock(&port->phy_list_lock);
 257         spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
 258
 259         /* Only insert revalidate event if the port still has members */
 260         if (port->port && dev && dev_is_expander(dev->dev_type)) {
 261                 struct expander_device *ex_dev = &dev->ex_dev;
 262
 263                 ex_dev->ex_change_count = -1;
 264                 sas_discover_event(port, DISCE_REVALIDATE_DOMAIN);
 265         }
 266         flush_workqueue(sas_ha->disco_q);
 267
 268         return;
 269 }
 270
 271 /* ---------- SAS port events ---------- */
 272
 273 void sas_porte_bytes_dmaed(struct work_struct *work)
 274 {
 275         struct asd_sas_event *ev = to_asd_sas_event(work);
 276         struct asd_sas_phy *phy = ev->phy;
 277
 278         sas_form_port(phy);
 279 }
 280
 281 void sas_porte_broadcast_rcvd(struct work_struct *work)
 282 {
 283         struct asd_sas_event *ev = to_asd_sas_event(work);
 284         struct asd_sas_phy *phy = ev->phy;
 285         unsigned long flags;
 286         u32 prim;
 287
 288         spin_lock_irqsave(&phy->sas_prim_lock, flags);
 289         prim = phy->sas_prim;
 290         spin_unlock_irqrestore(&phy->sas_prim_lock, flags);
 291
 292         pr_debug("broadcast received: %d\n", prim);
 293         sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN);
 294
 295         if (phy->port)
 296                 flush_workqueue(phy->port->ha->disco_q);
 297 }
 298
 299 void sas_porte_link_reset_err(struct work_struct *work)
 300 {
 301         struct asd_sas_event *ev = to_asd_sas_event(work);
 302         struct asd_sas_phy *phy = ev->phy;
 303
 304         sas_deform_port(phy, 1);
 305 }
 306
 307 void sas_porte_timer_event(struct work_struct *work)
 308 {
 309         struct asd_sas_event *ev = to_asd_sas_event(work);
 310         struct asd_sas_phy *phy = ev->phy;
 311
 312         sas_deform_port(phy, 1);
 313 }
 314
 315 void sas_porte_hard_reset(struct work_struct *work)
 316 {
 317         struct asd_sas_event *ev = to_asd_sas_event(work);
 318         struct asd_sas_phy *phy = ev->phy;
 319
 320         sas_deform_port(phy, 1);
 321 }
 322
 323 /* ---------- SAS port registration ---------- */
 324
 325 static void sas_init_port(struct asd_sas_port *port,
 326                           struct sas_ha_struct *sas_ha, int i)
 327 {
 328         memset(port, 0, sizeof(*port));
 329         port->id = i;
 330         INIT_LIST_HEAD(&port->dev_list);
 331         INIT_LIST_HEAD(&port->disco_list);
 332         INIT_LIST_HEAD(&port->destroy_list);
 333         INIT_LIST_HEAD(&port->sas_port_del_list);
 334         spin_lock_init(&port->phy_list_lock);
 335         INIT_LIST_HEAD(&port->phy_list);
 336         port->ha = sas_ha;
 337
 338         spin_lock_init(&port->dev_list_lock);
 339 }
 340
 341 int sas_register_ports(struct sas_ha_struct *sas_ha)
 342 {
 343         int i;
 344
 345         /* initialize the ports and discovery */
 346         for (i = 0; i < sas_ha->num_phys; i++) {
 347                 struct asd_sas_port *port = sas_ha->sas_port[i];
 348
 349                 sas_init_port(port, sas_ha, i);
 350                 sas_init_disc(&port->disc, port);
 351         }
 352         return 0;
 353 }
 354
 355 void sas_unregister_ports(struct sas_ha_struct *sas_ha)
 356 {
 357         int i;
 358
 359         for (i = 0; i < sas_ha->num_phys; i++)
 360                 if (sas_ha->sas_phy[i]->port)
 361                         sas_deform_port(sas_ha->sas_phy[i], 0);
 362
 363 }
 364
 365 const work_func_t sas_port_event_fns[PORT_NUM_EVENTS] = {
 366         [PORTE_BYTES_DMAED] = sas_porte_bytes_dmaed,
 367         [PORTE_BROADCAST_RCVD] = sas_porte_broadcast_rcvd,
 368         [PORTE_LINK_RESET_ERR] = sas_porte_link_reset_err,
 369         [PORTE_TIMER_EVENT] = sas_porte_timer_event,
 370         [PORTE_HARD_RESET] = sas_porte_hard_reset,
 371 };