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 __func__, 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 __func__); 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 if (*(u64 *)port->attached_sas_addr == 0) { 96 port->class = phy->class; 97 memcpy(port->attached_sas_addr, phy->attached_sas_addr, 98 SAS_ADDR_SIZE); 99 port->iproto = phy->iproto; 100 port->tproto = phy->tproto; 101 port->oob_mode = phy->oob_mode; 102 port->linkrate = phy->linkrate; 103 } else 104 port->linkrate = max(port->linkrate, phy->linkrate); 105 spin_unlock(&port->phy_list_lock); 106 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags); 107 108 if (!port->port) { 109 port->port = sas_port_alloc(phy->phy->dev.parent, port->id); 110 BUG_ON(!port->port); 111 sas_port_add(port->port); 112 } 113 sas_port_add_phy(port->port, phy->phy); 114 115 SAS_DPRINTK("%s added to %s, phy_mask:0x%x (%16llx)\n", 116 phy->phy->dev.bus_id,port->port->dev.bus_id, 117 port->phy_mask, 118 SAS_ADDR(port->attached_sas_addr)); 119 120 if (port->port_dev) 121 port->port_dev->pathways = port->num_phys; 122 123 /* Tell the LLDD about this port formation. */ 124 if (si->dft->lldd_port_formed) 125 si->dft->lldd_port_formed(phy); 126 127 sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN); 128 } 129 130 /** 131 * sas_deform_port -- remove this phy from the port it belongs to 132 * @phy: the phy of interest 133 * 134 * This is called when the physical link to the other phy has been 135 * lost (on this phy), in Event thread context. We cannot delay here. 136 */ 137 void sas_deform_port(struct asd_sas_phy *phy) 138 { 139 struct sas_ha_struct *sas_ha = phy->ha; 140 struct asd_sas_port *port = phy->port; 141 struct sas_internal *si = 142 to_sas_internal(sas_ha->core.shost->transportt); 143 unsigned long flags; 144 145 if (!port) 146 return; /* done by a phy event */ 147 148 if (port->port_dev) 149 port->port_dev->pathways--; 150 151 if (port->num_phys == 1) { 152 sas_unregister_domain_devices(port); 153 sas_port_delete(port->port); 154 port->port = NULL; 155 } else 156 sas_port_delete_phy(port->port, phy->phy); 157 158 159 if (si->dft->lldd_port_deformed) 160 si->dft->lldd_port_deformed(phy); 161 162 spin_lock_irqsave(&sas_ha->phy_port_lock, flags); 163 spin_lock(&port->phy_list_lock); 164 165 list_del_init(&phy->port_phy_el); 166 phy->port = NULL; 167 port->num_phys--; 168 port->phy_mask &= ~(1U << phy->id); 169 170 if (port->num_phys == 0) { 171 INIT_LIST_HEAD(&port->phy_list); 172 memset(port->sas_addr, 0, SAS_ADDR_SIZE); 173 memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE); 174 port->class = 0; 175 port->iproto = 0; 176 port->tproto = 0; 177 port->oob_mode = 0; 178 port->phy_mask = 0; 179 } 180 spin_unlock(&port->phy_list_lock); 181 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags); 182 183 return; 184 } 185 186 /* ---------- SAS port events ---------- */ 187 188 void sas_porte_bytes_dmaed(struct work_struct *work) 189 { 190 struct asd_sas_event *ev = 191 container_of(work, struct asd_sas_event, work); 192 struct asd_sas_phy *phy = ev->phy; 193 194 sas_begin_event(PORTE_BYTES_DMAED, &phy->ha->event_lock, 195 &phy->port_events_pending); 196 197 sas_form_port(phy); 198 } 199 200 void sas_porte_broadcast_rcvd(struct work_struct *work) 201 { 202 struct asd_sas_event *ev = 203 container_of(work, struct asd_sas_event, work); 204 struct asd_sas_phy *phy = ev->phy; 205 unsigned long flags; 206 u32 prim; 207 208 sas_begin_event(PORTE_BROADCAST_RCVD, &phy->ha->event_lock, 209 &phy->port_events_pending); 210 211 spin_lock_irqsave(&phy->sas_prim_lock, flags); 212 prim = phy->sas_prim; 213 spin_unlock_irqrestore(&phy->sas_prim_lock, flags); 214 215 SAS_DPRINTK("broadcast received: %d\n", prim); 216 sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN); 217 } 218 219 void sas_porte_link_reset_err(struct work_struct *work) 220 { 221 struct asd_sas_event *ev = 222 container_of(work, struct asd_sas_event, work); 223 struct asd_sas_phy *phy = ev->phy; 224 225 sas_begin_event(PORTE_LINK_RESET_ERR, &phy->ha->event_lock, 226 &phy->port_events_pending); 227 228 sas_deform_port(phy); 229 } 230 231 void sas_porte_timer_event(struct work_struct *work) 232 { 233 struct asd_sas_event *ev = 234 container_of(work, struct asd_sas_event, work); 235 struct asd_sas_phy *phy = ev->phy; 236 237 sas_begin_event(PORTE_TIMER_EVENT, &phy->ha->event_lock, 238 &phy->port_events_pending); 239 240 sas_deform_port(phy); 241 } 242 243 void sas_porte_hard_reset(struct work_struct *work) 244 { 245 struct asd_sas_event *ev = 246 container_of(work, struct asd_sas_event, work); 247 struct asd_sas_phy *phy = ev->phy; 248 249 sas_begin_event(PORTE_HARD_RESET, &phy->ha->event_lock, 250 &phy->port_events_pending); 251 252 sas_deform_port(phy); 253 } 254 255 /* ---------- SAS port registration ---------- */ 256 257 static void sas_init_port(struct asd_sas_port *port, 258 struct sas_ha_struct *sas_ha, int i) 259 { 260 memset(port, 0, sizeof(*port)); 261 port->id = i; 262 INIT_LIST_HEAD(&port->dev_list); 263 spin_lock_init(&port->phy_list_lock); 264 INIT_LIST_HEAD(&port->phy_list); 265 port->ha = sas_ha; 266 267 spin_lock_init(&port->dev_list_lock); 268 } 269 270 int sas_register_ports(struct sas_ha_struct *sas_ha) 271 { 272 int i; 273 274 /* initialize the ports and discovery */ 275 for (i = 0; i < sas_ha->num_phys; i++) { 276 struct asd_sas_port *port = sas_ha->sas_port[i]; 277 278 sas_init_port(port, sas_ha, i); 279 sas_init_disc(&port->disc, port); 280 } 281 return 0; 282 } 283 284 void sas_unregister_ports(struct sas_ha_struct *sas_ha) 285 { 286 int i; 287 288 for (i = 0; i < sas_ha->num_phys; i++) 289 if (sas_ha->sas_phy[i]->port) 290 sas_deform_port(sas_ha->sas_phy[i]); 291 292 } 293