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 static bool phy_is_wideport_member(struct asd_sas_port *port, struct asd_sas_phy *phy)
  32 {
  33         struct sas_ha_struct *sas_ha = phy->ha;
  34
  35         if (memcmp(port->attached_sas_addr, phy->attached_sas_addr,
  36                    SAS_ADDR_SIZE) != 0 || (sas_ha->strict_wide_ports &&
  37              memcmp(port->sas_addr, phy->sas_addr, SAS_ADDR_SIZE) != 0))
  38                 return false;
  39         return true;
  40 }
  41
  42 /**
  43  * sas_form_port -- add this phy to a port
  44  * @phy: the phy of interest
  45  *
  46  * This function adds this phy to an existing port, thus creating a wide
  47  * port, or it creates a port and adds the phy to the port.
  48  */
  49 static void sas_form_port(struct asd_sas_phy *phy)
  50 {
  51         int i;
  52         struct sas_ha_struct *sas_ha = phy->ha;
  53         struct asd_sas_port *port = phy->port;
  54         struct sas_internal *si =
  55                 to_sas_internal(sas_ha->core.shost->transportt);
  56         unsigned long flags;
  57
  58         if (port) {
  59                 if (!phy_is_wideport_member(port, phy))
  60                         sas_deform_port(phy, 0);
  61                 else {
  62                         SAS_DPRINTK("%s: phy%d belongs to port%d already(%d)!\n",
  63                                     __func__, phy->id, phy->port->id,
  64                                     phy->port->num_phys);
  65                         return;
  66                 }
  67         }
  68
  69         /* see if the phy should be part of a wide port */
  70         spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
  71         for (i = 0; i < sas_ha->num_phys; i++) {
  72                 port = sas_ha->sas_port[i];
  73                 spin_lock(&port->phy_list_lock);
  74                 if (*(u64 *) port->sas_addr &&
  75                     phy_is_wideport_member(port, phy) && port->num_phys > 0) {
  76                         /* wide port */
  77                         SAS_DPRINTK("phy%d matched wide port%d\n", phy->id,
  78                                     port->id);
  79                         break;
  80                 }
  81                 spin_unlock(&port->phy_list_lock);
  82         }
  83         /* The phy does not match any existing port, create a new one */
  84         if (i == sas_ha->num_phys) {
  85                 for (i = 0; i < sas_ha->num_phys; i++) {
  86                         port = sas_ha->sas_port[i];
  87                         spin_lock(&port->phy_list_lock);
  88                         if (*(u64 *)port->sas_addr == 0
  89                                 && port->num_phys == 0) {
  90                                 memcpy(port->sas_addr, phy->sas_addr,
  91                                         SAS_ADDR_SIZE);
  92                                 break;
  93                         }
  94                         spin_unlock(&port->phy_list_lock);
  95                 }
  96         }
  97
  98         if (i >= sas_ha->num_phys) {
  99                 printk(KERN_NOTICE "%s: couldn't find a free port, bug?\n",
 100                        __func__);
 101                 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
 102                 return;
 103         }
 104
 105         /* add the phy to the port */
 106         list_add_tail(&phy->port_phy_el, &port->phy_list);
 107         phy->port = port;
 108         port->num_phys++;
 109         port->phy_mask |= (1U << phy->id);
 110
 111         if (!port->phy)
 112                 port->phy = phy->phy;
 113
 114         if (*(u64 *)port->attached_sas_addr == 0) {
 115                 port->class = phy->class;
 116                 memcpy(port->attached_sas_addr, phy->attached_sas_addr,
 117                        SAS_ADDR_SIZE);
 118                 port->iproto = phy->iproto;
 119                 port->tproto = phy->tproto;
 120                 port->oob_mode = phy->oob_mode;
 121                 port->linkrate = phy->linkrate;
 122         } else
 123                 port->linkrate = max(port->linkrate, phy->linkrate);
 124         spin_unlock(&port->phy_list_lock);
 125         spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
 126
 127         if (!port->port) {
 128                 port->port = sas_port_alloc(phy->phy->dev.parent, port->id);
 129                 BUG_ON(!port->port);
 130                 sas_port_add(port->port);
 131         }
 132         sas_port_add_phy(port->port, phy->phy);
 133
 134         SAS_DPRINTK("%s added to %s, phy_mask:0x%x (%16llx)\n",
 135                     dev_name(&phy->phy->dev), dev_name(&port->port->dev),
 136                     port->phy_mask,
 137                     SAS_ADDR(port->attached_sas_addr));
 138
 139         if (port->port_dev)
 140                 port->port_dev->pathways = port->num_phys;
 141
 142         /* Tell the LLDD about this port formation. */
 143         if (si->dft->lldd_port_formed)
 144                 si->dft->lldd_port_formed(phy);
 145
 146         sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN);
 147 }
 148
 149 /**
 150  * sas_deform_port -- remove this phy from the port it belongs to
 151  * @phy: the phy of interest
 152  *
 153  * This is called when the physical link to the other phy has been
 154  * lost (on this phy), in Event thread context. We cannot delay here.
 155  */
 156 void sas_deform_port(struct asd_sas_phy *phy, int gone)
 157 {
 158         struct sas_ha_struct *sas_ha = phy->ha;
 159         struct asd_sas_port *port = phy->port;
 160         struct sas_internal *si =
 161                 to_sas_internal(sas_ha->core.shost->transportt);
 162         struct domain_device *dev;
 163         unsigned long flags;
 164
 165         if (!port)
 166                 return;           /* done by a phy event */
 167
 168         dev = port->port_dev;
 169         if (dev)
 170                 dev->pathways--;
 171
 172         if (port->num_phys == 1) {
 173                 if (dev && gone)
 174                         dev->gone = 1;
 175                 sas_unregister_domain_devices(port);
 176                 sas_port_delete(port->port);
 177                 port->port = NULL;
 178         } else
 179                 sas_port_delete_phy(port->port, phy->phy);
 180
 181         if (si->dft->lldd_port_deformed)
 182                 si->dft->lldd_port_deformed(phy);
 183
 184         spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
 185         spin_lock(&port->phy_list_lock);
 186
 187         list_del_init(&phy->port_phy_el);
 188         phy->port = NULL;
 189         port->num_phys--;
 190         port->phy_mask &= ~(1U << phy->id);
 191
 192         if (port->num_phys == 0) {
 193                 INIT_LIST_HEAD(&port->phy_list);
 194                 memset(port->sas_addr, 0, SAS_ADDR_SIZE);
 195                 memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE);
 196                 port->class = 0;
 197                 port->iproto = 0;
 198                 port->tproto = 0;
 199                 port->oob_mode = 0;
 200                 port->phy_mask = 0;
 201         }
 202         spin_unlock(&port->phy_list_lock);
 203         spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
 204
 205         return;
 206 }
 207
 208 /* ---------- SAS port events ---------- */
 209
 210 void sas_porte_bytes_dmaed(struct work_struct *work)
 211 {
 212         struct asd_sas_event *ev =
 213                 container_of(work, struct asd_sas_event, work);
 214         struct asd_sas_phy *phy = ev->phy;
 215
 216         sas_begin_event(PORTE_BYTES_DMAED, &phy->ha->event_lock,
 217                         &phy->port_events_pending);
 218
 219         sas_form_port(phy);
 220 }
 221
 222 void sas_porte_broadcast_rcvd(struct work_struct *work)
 223 {
 224         struct asd_sas_event *ev =
 225                 container_of(work, struct asd_sas_event, work);
 226         struct asd_sas_phy *phy = ev->phy;
 227         unsigned long flags;
 228         u32 prim;
 229
 230         sas_begin_event(PORTE_BROADCAST_RCVD, &phy->ha->event_lock,
 231                         &phy->port_events_pending);
 232
 233         spin_lock_irqsave(&phy->sas_prim_lock, flags);
 234         prim = phy->sas_prim;
 235         spin_unlock_irqrestore(&phy->sas_prim_lock, flags);
 236
 237         SAS_DPRINTK("broadcast received: %d\n", prim);
 238         sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN);
 239 }
 240
 241 void sas_porte_link_reset_err(struct work_struct *work)
 242 {
 243         struct asd_sas_event *ev =
 244                 container_of(work, struct asd_sas_event, work);
 245         struct asd_sas_phy *phy = ev->phy;
 246
 247         sas_begin_event(PORTE_LINK_RESET_ERR, &phy->ha->event_lock,
 248                         &phy->port_events_pending);
 249
 250         sas_deform_port(phy, 1);
 251 }
 252
 253 void sas_porte_timer_event(struct work_struct *work)
 254 {
 255         struct asd_sas_event *ev =
 256                 container_of(work, struct asd_sas_event, work);
 257         struct asd_sas_phy *phy = ev->phy;
 258
 259         sas_begin_event(PORTE_TIMER_EVENT, &phy->ha->event_lock,
 260                         &phy->port_events_pending);
 261
 262         sas_deform_port(phy, 1);
 263 }
 264
 265 void sas_porte_hard_reset(struct work_struct *work)
 266 {
 267         struct asd_sas_event *ev =
 268                 container_of(work, struct asd_sas_event, work);
 269         struct asd_sas_phy *phy = ev->phy;
 270
 271         sas_begin_event(PORTE_HARD_RESET, &phy->ha->event_lock,
 272                         &phy->port_events_pending);
 273
 274         sas_deform_port(phy, 1);
 275 }
 276
 277 /* ---------- SAS port registration ---------- */
 278
 279 static void sas_init_port(struct asd_sas_port *port,
 280                           struct sas_ha_struct *sas_ha, int i)
 281 {
 282         memset(port, 0, sizeof(*port));
 283         port->id = i;
 284         INIT_LIST_HEAD(&port->dev_list);
 285         spin_lock_init(&port->phy_list_lock);
 286         INIT_LIST_HEAD(&port->phy_list);
 287         port->ha = sas_ha;
 288
 289         spin_lock_init(&port->dev_list_lock);
 290 }
 291
 292 int sas_register_ports(struct sas_ha_struct *sas_ha)
 293 {
 294         int i;
 295
 296         /* initialize the ports and discovery */
 297         for (i = 0; i < sas_ha->num_phys; i++) {
 298                 struct asd_sas_port *port = sas_ha->sas_port[i];
 299
 300                 sas_init_port(port, sas_ha, i);
 301                 sas_init_disc(&port->disc, port);
 302         }
 303         return 0;
 304 }
 305
 306 void sas_unregister_ports(struct sas_ha_struct *sas_ha)
 307 {
 308         int i;
 309
 310         for (i = 0; i < sas_ha->num_phys; i++)
 311                 if (sas_ha->sas_phy[i]->port)
 312                         sas_deform_port(sas_ha->sas_phy[i], 0);
 313
 314 }