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