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 static void sas_resume_port(struct asd_sas_phy *phy) 43 { 44 struct domain_device *dev; 45 struct asd_sas_port *port = phy->port; 46 struct sas_ha_struct *sas_ha = phy->ha; 47 struct sas_internal *si = to_sas_internal(sas_ha->core.shost->transportt); 48 49 if (si->dft->lldd_port_formed) 50 si->dft->lldd_port_formed(phy); 51 52 if (port->suspended) 53 port->suspended = 0; 54 else { 55 /* we only need to handle "link returned" actions once */ 56 return; 57 } 58 59 /* if the port came back: 60 * 1/ presume every device came back 61 * 2/ force the next revalidation to check all expander phys 62 */ 63 list_for_each_entry(dev, &port->dev_list, dev_list_node) { 64 int i, rc; 65 66 rc = sas_notify_lldd_dev_found(dev); 67 if (rc) { 68 sas_unregister_dev(port, dev); 69 continue; 70 } 71 72 if (dev->dev_type == SAS_EDGE_EXPANDER_DEVICE || dev->dev_type == SAS_FANOUT_EXPANDER_DEVICE) { 73 dev->ex_dev.ex_change_count = -1; 74 for (i = 0; i < dev->ex_dev.num_phys; i++) { 75 struct ex_phy *phy = &dev->ex_dev.ex_phy[i]; 76 77 phy->phy_change_count = -1; 78 } 79 } 80 } 81 82 sas_discover_event(port, DISCE_RESUME); 83 } 84 85 /** 86 * sas_form_port -- add this phy to a port 87 * @phy: the phy of interest 88 * 89 * This function adds this phy to an existing port, thus creating a wide 90 * port, or it creates a port and adds the phy to the port. 91 */ 92 static void sas_form_port(struct asd_sas_phy *phy) 93 { 94 int i; 95 struct sas_ha_struct *sas_ha = phy->ha; 96 struct asd_sas_port *port = phy->port; 97 struct sas_internal *si = 98 to_sas_internal(sas_ha->core.shost->transportt); 99 unsigned long flags; 100 101 if (port) { 102 if (!phy_is_wideport_member(port, phy)) 103 sas_deform_port(phy, 0); 104 else if (phy->suspended) { 105 phy->suspended = 0; 106 sas_resume_port(phy); 107 108 /* phy came back, try to cancel the timeout */ 109 wake_up(&sas_ha->eh_wait_q); 110 return; 111 } else { 112 SAS_DPRINTK("%s: phy%d belongs to port%d already(%d)!\n", 113 __func__, phy->id, phy->port->id, 114 phy->port->num_phys); 115 return; 116 } 117 } 118 119 /* see if the phy should be part of a wide port */ 120 spin_lock_irqsave(&sas_ha->phy_port_lock, flags); 121 for (i = 0; i < sas_ha->num_phys; i++) { 122 port = sas_ha->sas_port[i]; 123 spin_lock(&port->phy_list_lock); 124 if (*(u64 *) port->sas_addr && 125 phy_is_wideport_member(port, phy) && port->num_phys > 0) { 126 /* wide port */ 127 SAS_DPRINTK("phy%d matched wide port%d\n", phy->id, 128 port->id); 129 break; 130 } 131 spin_unlock(&port->phy_list_lock); 132 } 133 /* The phy does not match any existing port, create a new one */ 134 if (i == sas_ha->num_phys) { 135 for (i = 0; i < sas_ha->num_phys; i++) { 136 port = sas_ha->sas_port[i]; 137 spin_lock(&port->phy_list_lock); 138 if (*(u64 *)port->sas_addr == 0 139 && port->num_phys == 0) { 140 memcpy(port->sas_addr, phy->sas_addr, 141 SAS_ADDR_SIZE); 142 break; 143 } 144 spin_unlock(&port->phy_list_lock); 145 } 146 } 147 148 if (i >= sas_ha->num_phys) { 149 printk(KERN_NOTICE "%s: couldn't find a free port, bug?\n", 150 __func__); 151 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags); 152 return; 153 } 154 155 /* add the phy to the port */ 156 list_add_tail(&phy->port_phy_el, &port->phy_list); 157 sas_phy_set_target(phy, port->port_dev); 158 phy->port = port; 159 port->num_phys++; 160 port->phy_mask |= (1U << phy->id); 161 162 if (*(u64 *)port->attached_sas_addr == 0) { 163 port->class = phy->class; 164 memcpy(port->attached_sas_addr, phy->attached_sas_addr, 165 SAS_ADDR_SIZE); 166 port->iproto = phy->iproto; 167 port->tproto = phy->tproto; 168 port->oob_mode = phy->oob_mode; 169 port->linkrate = phy->linkrate; 170 } else 171 port->linkrate = max(port->linkrate, phy->linkrate); 172 spin_unlock(&port->phy_list_lock); 173 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags); 174 175 if (!port->port) { 176 port->port = sas_port_alloc(phy->phy->dev.parent, port->id); 177 BUG_ON(!port->port); 178 sas_port_add(port->port); 179 } 180 sas_port_add_phy(port->port, phy->phy); 181 182 SAS_DPRINTK("%s added to %s, phy_mask:0x%x (%16llx)\n", 183 dev_name(&phy->phy->dev), dev_name(&port->port->dev), 184 port->phy_mask, 185 SAS_ADDR(port->attached_sas_addr)); 186 187 if (port->port_dev) 188 port->port_dev->pathways = port->num_phys; 189 190 /* Tell the LLDD about this port formation. */ 191 if (si->dft->lldd_port_formed) 192 si->dft->lldd_port_formed(phy); 193 194 sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN); 195 } 196 197 /** 198 * sas_deform_port -- remove this phy from the port it belongs to 199 * @phy: the phy of interest 200 * 201 * This is called when the physical link to the other phy has been 202 * lost (on this phy), in Event thread context. We cannot delay here. 203 */ 204 void sas_deform_port(struct asd_sas_phy *phy, int gone) 205 { 206 struct sas_ha_struct *sas_ha = phy->ha; 207 struct asd_sas_port *port = phy->port; 208 struct sas_internal *si = 209 to_sas_internal(sas_ha->core.shost->transportt); 210 struct domain_device *dev; 211 unsigned long flags; 212 213 if (!port) 214 return; /* done by a phy event */ 215 216 dev = port->port_dev; 217 if (dev) 218 dev->pathways--; 219 220 if (port->num_phys == 1) { 221 sas_unregister_domain_devices(port, gone); 222 sas_port_delete(port->port); 223 port->port = NULL; 224 } else { 225 sas_port_delete_phy(port->port, phy->phy); 226 sas_device_set_phy(dev, port->port); 227 } 228 229 if (si->dft->lldd_port_deformed) 230 si->dft->lldd_port_deformed(phy); 231 232 spin_lock_irqsave(&sas_ha->phy_port_lock, flags); 233 spin_lock(&port->phy_list_lock); 234 235 list_del_init(&phy->port_phy_el); 236 sas_phy_set_target(phy, NULL); 237 phy->port = NULL; 238 port->num_phys--; 239 port->phy_mask &= ~(1U << phy->id); 240 241 if (port->num_phys == 0) { 242 INIT_LIST_HEAD(&port->phy_list); 243 memset(port->sas_addr, 0, SAS_ADDR_SIZE); 244 memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE); 245 port->class = 0; 246 port->iproto = 0; 247 port->tproto = 0; 248 port->oob_mode = 0; 249 port->phy_mask = 0; 250 } 251 spin_unlock(&port->phy_list_lock); 252 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags); 253 254 return; 255 } 256 257 /* ---------- SAS port events ---------- */ 258 259 void sas_porte_bytes_dmaed(struct work_struct *work) 260 { 261 struct asd_sas_event *ev = to_asd_sas_event(work); 262 struct asd_sas_phy *phy = ev->phy; 263 264 clear_bit(PORTE_BYTES_DMAED, &phy->port_events_pending); 265 266 sas_form_port(phy); 267 } 268 269 void sas_porte_broadcast_rcvd(struct work_struct *work) 270 { 271 struct asd_sas_event *ev = to_asd_sas_event(work); 272 struct asd_sas_phy *phy = ev->phy; 273 unsigned long flags; 274 u32 prim; 275 276 clear_bit(PORTE_BROADCAST_RCVD, &phy->port_events_pending); 277 278 spin_lock_irqsave(&phy->sas_prim_lock, flags); 279 prim = phy->sas_prim; 280 spin_unlock_irqrestore(&phy->sas_prim_lock, flags); 281 282 SAS_DPRINTK("broadcast received: %d\n", prim); 283 sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN); 284 } 285 286 void sas_porte_link_reset_err(struct work_struct *work) 287 { 288 struct asd_sas_event *ev = to_asd_sas_event(work); 289 struct asd_sas_phy *phy = ev->phy; 290 291 clear_bit(PORTE_LINK_RESET_ERR, &phy->port_events_pending); 292 293 sas_deform_port(phy, 1); 294 } 295 296 void sas_porte_timer_event(struct work_struct *work) 297 { 298 struct asd_sas_event *ev = to_asd_sas_event(work); 299 struct asd_sas_phy *phy = ev->phy; 300 301 clear_bit(PORTE_TIMER_EVENT, &phy->port_events_pending); 302 303 sas_deform_port(phy, 1); 304 } 305 306 void sas_porte_hard_reset(struct work_struct *work) 307 { 308 struct asd_sas_event *ev = to_asd_sas_event(work); 309 struct asd_sas_phy *phy = ev->phy; 310 311 clear_bit(PORTE_HARD_RESET, &phy->port_events_pending); 312 313 sas_deform_port(phy, 1); 314 } 315 316 /* ---------- SAS port registration ---------- */ 317 318 static void sas_init_port(struct asd_sas_port *port, 319 struct sas_ha_struct *sas_ha, int i) 320 { 321 memset(port, 0, sizeof(*port)); 322 port->id = i; 323 INIT_LIST_HEAD(&port->dev_list); 324 INIT_LIST_HEAD(&port->disco_list); 325 INIT_LIST_HEAD(&port->destroy_list); 326 spin_lock_init(&port->phy_list_lock); 327 INIT_LIST_HEAD(&port->phy_list); 328 port->ha = sas_ha; 329 330 spin_lock_init(&port->dev_list_lock); 331 } 332 333 int sas_register_ports(struct sas_ha_struct *sas_ha) 334 { 335 int i; 336 337 /* initialize the ports and discovery */ 338 for (i = 0; i < sas_ha->num_phys; i++) { 339 struct asd_sas_port *port = sas_ha->sas_port[i]; 340 341 sas_init_port(port, sas_ha, i); 342 sas_init_disc(&port->disc, port); 343 } 344 return 0; 345 } 346 347 void sas_unregister_ports(struct sas_ha_struct *sas_ha) 348 { 349 int i; 350 351 for (i = 0; i < sas_ha->num_phys; i++) 352 if (sas_ha->sas_phy[i]->port) 353 sas_deform_port(sas_ha->sas_phy[i], 0); 354 355 } 356