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 /**
  32  * sas_form_port -- add this phy to a port
  33  * @phy: the phy of interest
  34  *
  35  * This function adds this phy to an existing port, thus creating a wide
  36  * port, or it creates a port and adds the phy to the port.
  37  */
  38 static void sas_form_port(struct asd_sas_phy *phy)
  39 {
  40         int i;
  41         struct sas_ha_struct *sas_ha = phy->ha;
  42         struct asd_sas_port *port = phy->port;
  43         struct sas_internal *si =
  44                 to_sas_internal(sas_ha->core.shost->transportt);
  45         unsigned long flags;
  46
  47         if (port) {
  48                 if (memcmp(port->attached_sas_addr, phy->attached_sas_addr,
  49                            SAS_ADDR_SIZE) != 0)
  50                         sas_deform_port(phy);
  51                 else {
  52                         SAS_DPRINTK("%s: phy%d belongs to port%d already(%d)!\n",
  53                                     __func__, phy->id, phy->port->id,
  54                                     phy->port->num_phys);
  55                         return;
  56                 }
  57         }
  58
  59         /* see if the phy should be part of a wide port */
  60         spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
  61         for (i = 0; i < sas_ha->num_phys; i++) {
  62                 port = sas_ha->sas_port[i];
  63                 spin_lock(&port->phy_list_lock);
  64                 if (*(u64 *) port->sas_addr &&
  65                     memcmp(port->attached_sas_addr,
  66                            phy->attached_sas_addr, SAS_ADDR_SIZE) == 0 &&
  67                     port->num_phys > 0) {
  68                         /* wide port */
  69                         SAS_DPRINTK("phy%d matched wide port%d\n", phy->id,
  70                                     port->id);
  71                         break;
  72                 }
  73                 spin_unlock(&port->phy_list_lock);
  74         }
  75         /* The phy does not match any existing port, create a new one */
  76         if (i == sas_ha->num_phys) {
  77                 for (i = 0; i < sas_ha->num_phys; i++) {
  78                         port = sas_ha->sas_port[i];
  79                         spin_lock(&port->phy_list_lock);
  80                         if (*(u64 *)port->sas_addr == 0
  81                                 && port->num_phys == 0) {
  82                                 memcpy(port->sas_addr, phy->sas_addr,
  83                                         SAS_ADDR_SIZE);
  84                                 break;
  85                         }
  86                         spin_unlock(&port->phy_list_lock);
  87                 }
  88         }
  89
  90         if (i >= sas_ha->num_phys) {
  91                 printk(KERN_NOTICE "%s: couldn't find a free port, bug?\n",
  92                        __func__);
  93                 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
  94                 return;
  95         }
  96
  97         /* add the phy to the port */
  98         list_add_tail(&phy->port_phy_el, &port->phy_list);
  99         phy->port = port;
 100         port->num_phys++;
 101         port->phy_mask |= (1U << phy->id);
 102
 103         if (!port->phy)
 104                 port->phy = phy->phy;
 105
 106         if (*(u64 *)port->attached_sas_addr == 0) {
 107                 port->class = phy->class;
 108                 memcpy(port->attached_sas_addr, phy->attached_sas_addr,
 109                        SAS_ADDR_SIZE);
 110                 port->iproto = phy->iproto;
 111                 port->tproto = phy->tproto;
 112                 port->oob_mode = phy->oob_mode;
 113                 port->linkrate = phy->linkrate;
 114         } else
 115                 port->linkrate = max(port->linkrate, phy->linkrate);
 116         spin_unlock(&port->phy_list_lock);
 117         spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
 118
 119         if (!port->port) {
 120                 port->port = sas_port_alloc(phy->phy->dev.parent, port->id);
 121                 BUG_ON(!port->port);
 122                 sas_port_add(port->port);
 123         }
 124         sas_port_add_phy(port->port, phy->phy);
 125
 126         SAS_DPRINTK("%s added to %s, phy_mask:0x%x (%16llx)\n",
 127                     dev_name(&phy->phy->dev), dev_name(&port->port->dev),
 128                     port->phy_mask,
 129                     SAS_ADDR(port->attached_sas_addr));
 130
 131         if (port->port_dev)
 132                 port->port_dev->pathways = port->num_phys;
 133
 134         /* Tell the LLDD about this port formation. */
 135         if (si->dft->lldd_port_formed)
 136                 si->dft->lldd_port_formed(phy);
 137
 138         sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN);
 139 }
 140
 141 /**
 142  * sas_deform_port -- remove this phy from the port it belongs to
 143  * @phy: the phy of interest
 144  *
 145  * This is called when the physical link to the other phy has been
 146  * lost (on this phy), in Event thread context. We cannot delay here.
 147  */
 148 void sas_deform_port(struct asd_sas_phy *phy)
 149 {
 150         struct sas_ha_struct *sas_ha = phy->ha;
 151         struct asd_sas_port *port = phy->port;
 152         struct sas_internal *si =
 153                 to_sas_internal(sas_ha->core.shost->transportt);
 154         unsigned long flags;
 155
 156         if (!port)
 157                 return;           /* done by a phy event */
 158
 159         if (port->port_dev)
 160                 port->port_dev->pathways--;
 161
 162         if (port->num_phys == 1) {
 163                 sas_unregister_domain_devices(port);
 164                 sas_port_delete(port->port);
 165                 port->port = NULL;
 166         } else
 167                 sas_port_delete_phy(port->port, phy->phy);
 168
 169
 170         if (si->dft->lldd_port_deformed)
 171                 si->dft->lldd_port_deformed(phy);
 172
 173         spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
 174         spin_lock(&port->phy_list_lock);
 175
 176         list_del_init(&phy->port_phy_el);
 177         phy->port = NULL;
 178         port->num_phys--;
 179         port->phy_mask &= ~(1U << phy->id);
 180
 181         if (port->num_phys == 0) {
 182                 INIT_LIST_HEAD(&port->phy_list);
 183                 memset(port->sas_addr, 0, SAS_ADDR_SIZE);
 184                 memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE);
 185                 port->class = 0;
 186                 port->iproto = 0;
 187                 port->tproto = 0;
 188                 port->oob_mode = 0;
 189                 port->phy_mask = 0;
 190         }
 191         spin_unlock(&port->phy_list_lock);
 192         spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
 193
 194         return;
 195 }
 196
 197 /* ---------- SAS port events ---------- */
 198
 199 void sas_porte_bytes_dmaed(struct work_struct *work)
 200 {
 201         struct asd_sas_event *ev =
 202                 container_of(work, struct asd_sas_event, work);
 203         struct asd_sas_phy *phy = ev->phy;
 204
 205         sas_begin_event(PORTE_BYTES_DMAED, &phy->ha->event_lock,
 206                         &phy->port_events_pending);
 207
 208         sas_form_port(phy);
 209 }
 210
 211 void sas_porte_broadcast_rcvd(struct work_struct *work)
 212 {
 213         struct asd_sas_event *ev =
 214                 container_of(work, struct asd_sas_event, work);
 215         struct asd_sas_phy *phy = ev->phy;
 216         unsigned long flags;
 217         u32 prim;
 218
 219         sas_begin_event(PORTE_BROADCAST_RCVD, &phy->ha->event_lock,
 220                         &phy->port_events_pending);
 221
 222         spin_lock_irqsave(&phy->sas_prim_lock, flags);
 223         prim = phy->sas_prim;
 224         spin_unlock_irqrestore(&phy->sas_prim_lock, flags);
 225
 226         SAS_DPRINTK("broadcast received: %d\n", prim);
 227         sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN);
 228 }
 229
 230 void sas_porte_link_reset_err(struct work_struct *work)
 231 {
 232         struct asd_sas_event *ev =
 233                 container_of(work, struct asd_sas_event, work);
 234         struct asd_sas_phy *phy = ev->phy;
 235
 236         sas_begin_event(PORTE_LINK_RESET_ERR, &phy->ha->event_lock,
 237                         &phy->port_events_pending);
 238
 239         sas_deform_port(phy);
 240 }
 241
 242 void sas_porte_timer_event(struct work_struct *work)
 243 {
 244         struct asd_sas_event *ev =
 245                 container_of(work, struct asd_sas_event, work);
 246         struct asd_sas_phy *phy = ev->phy;
 247
 248         sas_begin_event(PORTE_TIMER_EVENT, &phy->ha->event_lock,
 249                         &phy->port_events_pending);
 250
 251         sas_deform_port(phy);
 252 }
 253
 254 void sas_porte_hard_reset(struct work_struct *work)
 255 {
 256         struct asd_sas_event *ev =
 257                 container_of(work, struct asd_sas_event, work);
 258         struct asd_sas_phy *phy = ev->phy;
 259
 260         sas_begin_event(PORTE_HARD_RESET, &phy->ha->event_lock,
 261                         &phy->port_events_pending);
 262
 263         sas_deform_port(phy);
 264 }
 265
 266 /* ---------- SAS port registration ---------- */
 267
 268 static void sas_init_port(struct asd_sas_port *port,
 269                           struct sas_ha_struct *sas_ha, int i)
 270 {
 271         memset(port, 0, sizeof(*port));
 272         port->id = i;
 273         INIT_LIST_HEAD(&port->dev_list);
 274         spin_lock_init(&port->phy_list_lock);
 275         INIT_LIST_HEAD(&port->phy_list);
 276         port->ha = sas_ha;
 277
 278         spin_lock_init(&port->dev_list_lock);
 279 }
 280
 281 int sas_register_ports(struct sas_ha_struct *sas_ha)
 282 {
 283         int i;
 284
 285         /* initialize the ports and discovery */
 286         for (i = 0; i < sas_ha->num_phys; i++) {
 287                 struct asd_sas_port *port = sas_ha->sas_port[i];
 288
 289                 sas_init_port(port, sas_ha, i);
 290                 sas_init_disc(&port->disc, port);
 291         }
 292         return 0;
 293 }
 294
 295 void sas_unregister_ports(struct sas_ha_struct *sas_ha)
 296 {
 297         int i;
 298
 299         for (i = 0; i < sas_ha->num_phys; i++)
 300                 if (sas_ha->sas_phy[i]->port)
 301                         sas_deform_port(sas_ha->sas_phy[i]);
 302
 303 }