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 (!port->phy) 112 port->phy = phy->phy; 113 114 if (*(u64 *)port->attached_sas_addr == 0) { 115 port->class = phy->class; 116 memcpy(port->attached_sas_addr, phy->attached_sas_addr, 117 SAS_ADDR_SIZE); 118 port->iproto = phy->iproto; 119 port->tproto = phy->tproto; 120 port->oob_mode = phy->oob_mode; 121 port->linkrate = phy->linkrate; 122 } else 123 port->linkrate = max(port->linkrate, phy->linkrate); 124 spin_unlock(&port->phy_list_lock); 125 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags); 126 127 if (!port->port) { 128 port->port = sas_port_alloc(phy->phy->dev.parent, port->id); 129 BUG_ON(!port->port); 130 sas_port_add(port->port); 131 } 132 sas_port_add_phy(port->port, phy->phy); 133 134 SAS_DPRINTK("%s added to %s, phy_mask:0x%x (%16llx)\n", 135 dev_name(&phy->phy->dev), dev_name(&port->port->dev), 136 port->phy_mask, 137 SAS_ADDR(port->attached_sas_addr)); 138 139 if (port->port_dev) 140 port->port_dev->pathways = port->num_phys; 141 142 /* Tell the LLDD about this port formation. */ 143 if (si->dft->lldd_port_formed) 144 si->dft->lldd_port_formed(phy); 145 146 sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN); 147 } 148 149 /** 150 * sas_deform_port -- remove this phy from the port it belongs to 151 * @phy: the phy of interest 152 * 153 * This is called when the physical link to the other phy has been 154 * lost (on this phy), in Event thread context. We cannot delay here. 155 */ 156 void sas_deform_port(struct asd_sas_phy *phy, int gone) 157 { 158 struct sas_ha_struct *sas_ha = phy->ha; 159 struct asd_sas_port *port = phy->port; 160 struct sas_internal *si = 161 to_sas_internal(sas_ha->core.shost->transportt); 162 struct domain_device *dev; 163 unsigned long flags; 164 165 if (!port) 166 return; /* done by a phy event */ 167 168 dev = port->port_dev; 169 if (dev) 170 dev->pathways--; 171 172 if (port->num_phys == 1) { 173 if (dev && gone) 174 dev->gone = 1; 175 sas_unregister_domain_devices(port); 176 sas_port_delete(port->port); 177 port->port = NULL; 178 } else 179 sas_port_delete_phy(port->port, phy->phy); 180 181 if (si->dft->lldd_port_deformed) 182 si->dft->lldd_port_deformed(phy); 183 184 spin_lock_irqsave(&sas_ha->phy_port_lock, flags); 185 spin_lock(&port->phy_list_lock); 186 187 list_del_init(&phy->port_phy_el); 188 phy->port = NULL; 189 port->num_phys--; 190 port->phy_mask &= ~(1U << phy->id); 191 192 if (port->num_phys == 0) { 193 INIT_LIST_HEAD(&port->phy_list); 194 memset(port->sas_addr, 0, SAS_ADDR_SIZE); 195 memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE); 196 port->class = 0; 197 port->iproto = 0; 198 port->tproto = 0; 199 port->oob_mode = 0; 200 port->phy_mask = 0; 201 } 202 spin_unlock(&port->phy_list_lock); 203 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags); 204 205 return; 206 } 207 208 /* ---------- SAS port events ---------- */ 209 210 void sas_porte_bytes_dmaed(struct work_struct *work) 211 { 212 struct asd_sas_event *ev = 213 container_of(work, struct asd_sas_event, work); 214 struct asd_sas_phy *phy = ev->phy; 215 216 sas_begin_event(PORTE_BYTES_DMAED, &phy->ha->event_lock, 217 &phy->port_events_pending); 218 219 sas_form_port(phy); 220 } 221 222 void sas_porte_broadcast_rcvd(struct work_struct *work) 223 { 224 struct asd_sas_event *ev = 225 container_of(work, struct asd_sas_event, work); 226 struct asd_sas_phy *phy = ev->phy; 227 unsigned long flags; 228 u32 prim; 229 230 sas_begin_event(PORTE_BROADCAST_RCVD, &phy->ha->event_lock, 231 &phy->port_events_pending); 232 233 spin_lock_irqsave(&phy->sas_prim_lock, flags); 234 prim = phy->sas_prim; 235 spin_unlock_irqrestore(&phy->sas_prim_lock, flags); 236 237 SAS_DPRINTK("broadcast received: %d\n", prim); 238 sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN); 239 } 240 241 void sas_porte_link_reset_err(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_LINK_RESET_ERR, &phy->ha->event_lock, 248 &phy->port_events_pending); 249 250 sas_deform_port(phy, 1); 251 } 252 253 void sas_porte_timer_event(struct work_struct *work) 254 { 255 struct asd_sas_event *ev = 256 container_of(work, struct asd_sas_event, work); 257 struct asd_sas_phy *phy = ev->phy; 258 259 sas_begin_event(PORTE_TIMER_EVENT, &phy->ha->event_lock, 260 &phy->port_events_pending); 261 262 sas_deform_port(phy, 1); 263 } 264 265 void sas_porte_hard_reset(struct work_struct *work) 266 { 267 struct asd_sas_event *ev = 268 container_of(work, struct asd_sas_event, work); 269 struct asd_sas_phy *phy = ev->phy; 270 271 sas_begin_event(PORTE_HARD_RESET, &phy->ha->event_lock, 272 &phy->port_events_pending); 273 274 sas_deform_port(phy, 1); 275 } 276 277 /* ---------- SAS port registration ---------- */ 278 279 static void sas_init_port(struct asd_sas_port *port, 280 struct sas_ha_struct *sas_ha, int i) 281 { 282 memset(port, 0, sizeof(*port)); 283 port->id = i; 284 INIT_LIST_HEAD(&port->dev_list); 285 spin_lock_init(&port->phy_list_lock); 286 INIT_LIST_HEAD(&port->phy_list); 287 port->ha = sas_ha; 288 289 spin_lock_init(&port->dev_list_lock); 290 } 291 292 int sas_register_ports(struct sas_ha_struct *sas_ha) 293 { 294 int i; 295 296 /* initialize the ports and discovery */ 297 for (i = 0; i < sas_ha->num_phys; i++) { 298 struct asd_sas_port *port = sas_ha->sas_port[i]; 299 300 sas_init_port(port, sas_ha, i); 301 sas_init_disc(&port->disc, port); 302 } 303 return 0; 304 } 305 306 void sas_unregister_ports(struct sas_ha_struct *sas_ha) 307 { 308 int i; 309 310 for (i = 0; i < sas_ha->num_phys; i++) 311 if (sas_ha->sas_phy[i]->port) 312 sas_deform_port(sas_ha->sas_phy[i], 0); 313 314 } 315