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