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