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 } 292