release/src-rt-6.x/linux/linux-2.6/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         SAS_DPRINTK("phy%d added to port%d, phy_mask:0x%x\n", phy->id,
  96                     port->id, port->phy_mask);
  97
  98         if (*(u64 *)port->attached_sas_addr == 0) {
  99                 port->class = phy->class;
 100                 memcpy(port->attached_sas_addr, phy->attached_sas_addr,
 101                        SAS_ADDR_SIZE);
 102                 port->iproto = phy->iproto;
 103                 port->tproto = phy->tproto;
 104                 port->oob_mode = phy->oob_mode;
 105                 port->linkrate = phy->linkrate;
 106         } else
 107                 port->linkrate = max(port->linkrate, phy->linkrate);
 108         spin_unlock(&port->phy_list_lock);
 109         spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
 110
 111         if (!port->port) {
 112                 port->port = sas_port_alloc(phy->phy->dev.parent, port->id);
 113                 BUG_ON(!port->port);
 114                 sas_port_add(port->port);
 115         }
 116         sas_port_add_phy(port->port, phy->phy);
 117
 118         if (port->port_dev)
 119                 port->port_dev->pathways = port->num_phys;
 120
 121         /* Tell the LLDD about this port formation. */
 122         if (si->dft->lldd_port_formed)
 123                 si->dft->lldd_port_formed(phy);
 124
 125         sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN);
 126 }
 127
 128 /**
 129  * sas_deform_port -- remove this phy from the port it belongs to
 130  * @phy: the phy of interest
 131  *
 132  * This is called when the physical link to the other phy has been
 133  * lost (on this phy), in Event thread context. We cannot delay here.
 134  */
 135 void sas_deform_port(struct asd_sas_phy *phy)
 136 {
 137         struct sas_ha_struct *sas_ha = phy->ha;
 138         struct asd_sas_port *port = phy->port;
 139         struct sas_internal *si =
 140                 to_sas_internal(sas_ha->core.shost->transportt);
 141         unsigned long flags;
 142
 143         if (!port)
 144                 return;           /* done by a phy event */
 145
 146         if (port->port_dev)
 147                 port->port_dev->pathways--;
 148
 149         if (port->num_phys == 1) {
 150                 sas_unregister_domain_devices(port);
 151                 sas_port_delete(port->port);
 152                 port->port = NULL;
 153         } else
 154                 sas_port_delete_phy(port->port, phy->phy);
 155
 156
 157         if (si->dft->lldd_port_deformed)
 158                 si->dft->lldd_port_deformed(phy);
 159
 160         spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
 161         spin_lock(&port->phy_list_lock);
 162
 163         list_del_init(&phy->port_phy_el);
 164         phy->port = NULL;
 165         port->num_phys--;
 166         port->phy_mask &= ~(1U << phy->id);
 167
 168         if (port->num_phys == 0) {
 169                 INIT_LIST_HEAD(&port->phy_list);
 170                 memset(port->sas_addr, 0, SAS_ADDR_SIZE);
 171                 memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE);
 172                 port->class = 0;
 173                 port->iproto = 0;
 174                 port->tproto = 0;
 175                 port->oob_mode = 0;
 176                 port->phy_mask = 0;
 177         }
 178         spin_unlock(&port->phy_list_lock);
 179         spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
 180
 181         return;
 182 }
 183
 184 /* ---------- SAS port events ---------- */
 185
 186 void sas_porte_bytes_dmaed(struct work_struct *work)
 187 {
 188         struct asd_sas_event *ev =
 189                 container_of(work, struct asd_sas_event, work);
 190         struct asd_sas_phy *phy = ev->phy;
 191
 192         sas_begin_event(PORTE_BYTES_DMAED, &phy->ha->event_lock,
 193                         &phy->port_events_pending);
 194
 195         sas_form_port(phy);
 196 }
 197
 198 void sas_porte_broadcast_rcvd(struct work_struct *work)
 199 {
 200         struct asd_sas_event *ev =
 201                 container_of(work, struct asd_sas_event, work);
 202         struct asd_sas_phy *phy = ev->phy;
 203         unsigned long flags;
 204         u32 prim;
 205
 206         sas_begin_event(PORTE_BROADCAST_RCVD, &phy->ha->event_lock,
 207                         &phy->port_events_pending);
 208
 209         spin_lock_irqsave(&phy->sas_prim_lock, flags);
 210         prim = phy->sas_prim;
 211         spin_unlock_irqrestore(&phy->sas_prim_lock, flags);
 212
 213         SAS_DPRINTK("broadcast received: %d\n", prim);
 214         sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN);
 215 }
 216
 217 void sas_porte_link_reset_err(struct work_struct *work)
 218 {
 219         struct asd_sas_event *ev =
 220                 container_of(work, struct asd_sas_event, work);
 221         struct asd_sas_phy *phy = ev->phy;
 222
 223         sas_begin_event(PORTE_LINK_RESET_ERR, &phy->ha->event_lock,
 224                         &phy->port_events_pending);
 225
 226         sas_deform_port(phy);
 227 }
 228
 229 void sas_porte_timer_event(struct work_struct *work)
 230 {
 231         struct asd_sas_event *ev =
 232                 container_of(work, struct asd_sas_event, work);
 233         struct asd_sas_phy *phy = ev->phy;
 234
 235         sas_begin_event(PORTE_TIMER_EVENT, &phy->ha->event_lock,
 236                         &phy->port_events_pending);
 237
 238         sas_deform_port(phy);
 239 }
 240
 241 void sas_porte_hard_reset(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_HARD_RESET, &phy->ha->event_lock,
 248                         &phy->port_events_pending);
 249
 250         sas_deform_port(phy);
 251 }
 252
 253 /* ---------- SAS port registration ---------- */
 254
 255 static void sas_init_port(struct asd_sas_port *port,
 256                           struct sas_ha_struct *sas_ha, int i)
 257 {
 258         port->id = i;
 259         INIT_LIST_HEAD(&port->dev_list);
 260         spin_lock_init(&port->phy_list_lock);
 261         INIT_LIST_HEAD(&port->phy_list);
 262         port->num_phys = 0;
 263         port->phy_mask = 0;
 264         port->ha = sas_ha;
 265
 266         spin_lock_init(&port->dev_list_lock);
 267 }
 268
 269 int sas_register_ports(struct sas_ha_struct *sas_ha)
 270 {
 271         int i;
 272
 273         /* initialize the ports and discovery */
 274         for (i = 0; i < sas_ha->num_phys; i++) {
 275                 struct asd_sas_port *port = sas_ha->sas_port[i];
 276
 277                 sas_init_port(port, sas_ha, i);
 278                 sas_init_disc(&port->disc, port);
 279         }
 280         return 0;
 281 }
 282
 283 void sas_unregister_ports(struct sas_ha_struct *sas_ha)
 284 {
 285         int i;
 286
 287         for (i = 0; i < sas_ha->num_phys; i++)
 288                 if (sas_ha->sas_phy[i]->port)
 289                         sas_deform_port(sas_ha->sas_phy[i]);
 290
 291 }