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 <<<<<<< HEAD:drivers/scsi/libsas/sas_port.c
  96         SAS_DPRINTK("phy%d added to port%d, phy_mask:0x%x\n", phy->id,
  97                     port->id, port->phy_mask);
  98
  99 =======
 100 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/scsi/libsas/sas_port.c
 101         if (*(u64 *)port->attached_sas_addr == 0) {
 102                 port->class = phy->class;
 103                 memcpy(port->attached_sas_addr, phy->attached_sas_addr,
 104                        SAS_ADDR_SIZE);
 105                 port->iproto = phy->iproto;
 106                 port->tproto = phy->tproto;
 107                 port->oob_mode = phy->oob_mode;
 108                 port->linkrate = phy->linkrate;
 109         } else
 110                 port->linkrate = max(port->linkrate, phy->linkrate);
 111         spin_unlock(&port->phy_list_lock);
 112         spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
 113
 114         if (!port->port) {
 115                 port->port = sas_port_alloc(phy->phy->dev.parent, port->id);
 116                 BUG_ON(!port->port);
 117                 sas_port_add(port->port);
 118         }
 119         sas_port_add_phy(port->port, phy->phy);
 120
 121 <<<<<<< HEAD:drivers/scsi/libsas/sas_port.c
 122 =======
 123         SAS_DPRINTK("%s added to %s, phy_mask:0x%x (%16llx)\n",
 124                     phy->phy->dev.bus_id,port->port->dev.bus_id,
 125                     port->phy_mask,
 126                     SAS_ADDR(port->attached_sas_addr));
 127
 128 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/scsi/libsas/sas_port.c
 129         if (port->port_dev)
 130                 port->port_dev->pathways = port->num_phys;
 131
 132         /* Tell the LLDD about this port formation. */
 133         if (si->dft->lldd_port_formed)
 134                 si->dft->lldd_port_formed(phy);
 135
 136         sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN);
 137 }
 138
 139 /**
 140  * sas_deform_port -- remove this phy from the port it belongs to
 141  * @phy: the phy of interest
 142  *
 143  * This is called when the physical link to the other phy has been
 144  * lost (on this phy), in Event thread context. We cannot delay here.
 145  */
 146 void sas_deform_port(struct asd_sas_phy *phy)
 147 {
 148         struct sas_ha_struct *sas_ha = phy->ha;
 149         struct asd_sas_port *port = phy->port;
 150         struct sas_internal *si =
 151                 to_sas_internal(sas_ha->core.shost->transportt);
 152         unsigned long flags;
 153
 154         if (!port)
 155                 return;           /* done by a phy event */
 156
 157         if (port->port_dev)
 158                 port->port_dev->pathways--;
 159
 160         if (port->num_phys == 1) {
 161                 sas_unregister_domain_devices(port);
 162                 sas_port_delete(port->port);
 163                 port->port = NULL;
 164         } else
 165                 sas_port_delete_phy(port->port, phy->phy);
 166
 167
 168         if (si->dft->lldd_port_deformed)
 169                 si->dft->lldd_port_deformed(phy);
 170
 171         spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
 172         spin_lock(&port->phy_list_lock);
 173
 174         list_del_init(&phy->port_phy_el);
 175         phy->port = NULL;
 176         port->num_phys--;
 177         port->phy_mask &= ~(1U << phy->id);
 178
 179         if (port->num_phys == 0) {
 180                 INIT_LIST_HEAD(&port->phy_list);
 181                 memset(port->sas_addr, 0, SAS_ADDR_SIZE);
 182                 memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE);
 183                 port->class = 0;
 184                 port->iproto = 0;
 185                 port->tproto = 0;
 186                 port->oob_mode = 0;
 187                 port->phy_mask = 0;
 188         }
 189         spin_unlock(&port->phy_list_lock);
 190         spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
 191
 192         return;
 193 }
 194
 195 /* ---------- SAS port events ---------- */
 196
 197 void sas_porte_bytes_dmaed(struct work_struct *work)
 198 {
 199         struct asd_sas_event *ev =
 200                 container_of(work, struct asd_sas_event, work);
 201         struct asd_sas_phy *phy = ev->phy;
 202
 203         sas_begin_event(PORTE_BYTES_DMAED, &phy->ha->event_lock,
 204                         &phy->port_events_pending);
 205
 206         sas_form_port(phy);
 207 }
 208
 209 void sas_porte_broadcast_rcvd(struct work_struct *work)
 210 {
 211         struct asd_sas_event *ev =
 212                 container_of(work, struct asd_sas_event, work);
 213         struct asd_sas_phy *phy = ev->phy;
 214         unsigned long flags;
 215         u32 prim;
 216
 217         sas_begin_event(PORTE_BROADCAST_RCVD, &phy->ha->event_lock,
 218                         &phy->port_events_pending);
 219
 220         spin_lock_irqsave(&phy->sas_prim_lock, flags);
 221         prim = phy->sas_prim;
 222         spin_unlock_irqrestore(&phy->sas_prim_lock, flags);
 223
 224         SAS_DPRINTK("broadcast received: %d\n", prim);
 225         sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN);
 226 }
 227
 228 void sas_porte_link_reset_err(struct work_struct *work)
 229 {
 230         struct asd_sas_event *ev =
 231                 container_of(work, struct asd_sas_event, work);
 232         struct asd_sas_phy *phy = ev->phy;
 233
 234         sas_begin_event(PORTE_LINK_RESET_ERR, &phy->ha->event_lock,
 235                         &phy->port_events_pending);
 236
 237         sas_deform_port(phy);
 238 }
 239
 240 void sas_porte_timer_event(struct work_struct *work)
 241 {
 242         struct asd_sas_event *ev =
 243                 container_of(work, struct asd_sas_event, work);
 244         struct asd_sas_phy *phy = ev->phy;
 245
 246         sas_begin_event(PORTE_TIMER_EVENT, &phy->ha->event_lock,
 247                         &phy->port_events_pending);
 248
 249         sas_deform_port(phy);
 250 }
 251
 252 void sas_porte_hard_reset(struct work_struct *work)
 253 {
 254         struct asd_sas_event *ev =
 255                 container_of(work, struct asd_sas_event, work);
 256         struct asd_sas_phy *phy = ev->phy;
 257
 258         sas_begin_event(PORTE_HARD_RESET, &phy->ha->event_lock,
 259                         &phy->port_events_pending);
 260
 261         sas_deform_port(phy);
 262 }
 263
 264 /* ---------- SAS port registration ---------- */
 265
 266 static void sas_init_port(struct asd_sas_port *port,
 267                           struct sas_ha_struct *sas_ha, int i)
 268 {
 269 <<<<<<< HEAD:drivers/scsi/libsas/sas_port.c
 270 =======
 271         memset(port, 0, sizeof(*port));
 272 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/scsi/libsas/sas_port.c
 273         port->id = i;
 274         INIT_LIST_HEAD(&port->dev_list);
 275         spin_lock_init(&port->phy_list_lock);
 276         INIT_LIST_HEAD(&port->phy_list);
 277 <<<<<<< HEAD:drivers/scsi/libsas/sas_port.c
 278         port->num_phys = 0;
 279         port->phy_mask = 0;
 280 =======
 281 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/scsi/libsas/sas_port.c
 282         port->ha = sas_ha;
 283
 284         spin_lock_init(&port->dev_list_lock);
 285 }
 286
 287 int sas_register_ports(struct sas_ha_struct *sas_ha)
 288 {
 289         int i;
 290
 291         /* initialize the ports and discovery */
 292         for (i = 0; i < sas_ha->num_phys; i++) {
 293                 struct asd_sas_port *port = sas_ha->sas_port[i];
 294
 295                 sas_init_port(port, sas_ha, i);
 296                 sas_init_disc(&port->disc, port);
 297         }
 298         return 0;
 299 }
 300
 301 void sas_unregister_ports(struct sas_ha_struct *sas_ha)
 302 {
 303         int i;
 304
 305         for (i = 0; i < sas_ha->num_phys; i++)
 306                 if (sas_ha->sas_phy[i]->port)
 307                         sas_deform_port(sas_ha->sas_phy[i]);
 308
 309 }