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