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