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 sas_destruct_devices(port); 70 continue; 71 } 72 73 if (dev->dev_type == SAS_EDGE_EXPANDER_DEVICE || dev->dev_type == SAS_FANOUT_EXPANDER_DEVICE) { 74 dev->ex_dev.ex_change_count = -1; 75 for (i = 0; i < dev->ex_dev.num_phys; i++) { 76 struct ex_phy *phy = &dev->ex_dev.ex_phy[i]; 77 78 phy->phy_change_count = -1; 79 } 80 } 81 } 82 83 sas_discover_event(port, DISCE_RESUME); 84 } 85 86 /** 87 * sas_form_port - add this phy to a port 88 * @phy: the phy of interest 89 * 90 * This function adds this phy to an existing port, thus creating a wide 91 * port, or it creates a port and adds the phy to the port. 92 */ 93 static void sas_form_port(struct asd_sas_phy *phy) 94 { 95 int i; 96 struct sas_ha_struct *sas_ha = phy->ha; 97 struct asd_sas_port *port = phy->port; 98 struct sas_internal *si = 99 to_sas_internal(sas_ha->core.shost->transportt); 100 unsigned long flags; 101 102 if (port) { 103 if (!phy_is_wideport_member(port, phy)) 104 sas_deform_port(phy, 0); 105 else if (phy->suspended) { 106 phy->suspended = 0; 107 sas_resume_port(phy); 108 109 /* phy came back, try to cancel the timeout */ 110 wake_up(&sas_ha->eh_wait_q); 111 return; 112 } else { 113 pr_info("%s: phy%d belongs to port%d already(%d)!\n", 114 __func__, phy->id, phy->port->id, 115 phy->port->num_phys); 116 return; 117 } 118 } 119 120 /* see if the phy should be part of a wide port */ 121 spin_lock_irqsave(&sas_ha->phy_port_lock, flags); 122 for (i = 0; i < sas_ha->num_phys; i++) { 123 port = sas_ha->sas_port[i]; 124 spin_lock(&port->phy_list_lock); 125 if (*(u64 *) port->sas_addr && 126 phy_is_wideport_member(port, phy) && port->num_phys > 0) { 127 /* wide port */ 128 pr_debug("phy%d matched wide port%d\n", phy->id, 129 port->id); 130 break; 131 } 132 spin_unlock(&port->phy_list_lock); 133 } 134 /* The phy does not match any existing port, create a new one */ 135 if (i == sas_ha->num_phys) { 136 for (i = 0; i < sas_ha->num_phys; i++) { 137 port = sas_ha->sas_port[i]; 138 spin_lock(&port->phy_list_lock); 139 if (*(u64 *)port->sas_addr == 0 140 && port->num_phys == 0) { 141 memcpy(port->sas_addr, phy->sas_addr, 142 SAS_ADDR_SIZE); 143 break; 144 } 145 spin_unlock(&port->phy_list_lock); 146 } 147 } 148 149 if (i >= sas_ha->num_phys) { 150 pr_err("%s: couldn't find a free port, bug?\n", __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 pr_debug("%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 flush_workqueue(sas_ha->disco_q); 196 } 197 198 /** 199 * sas_deform_port - remove this phy from the port it belongs to 200 * @phy: the phy of interest 201 * @gone: whether or not the PHY is gone 202 * 203 * This is called when the physical link to the other phy has been 204 * lost (on this phy), in Event thread context. We cannot delay here. 205 */ 206 void sas_deform_port(struct asd_sas_phy *phy, int gone) 207 { 208 struct sas_ha_struct *sas_ha = phy->ha; 209 struct asd_sas_port *port = phy->port; 210 struct sas_internal *si = 211 to_sas_internal(sas_ha->core.shost->transportt); 212 struct domain_device *dev; 213 unsigned long flags; 214 215 if (!port) 216 return; /* done by a phy event */ 217 218 dev = port->port_dev; 219 if (dev) 220 dev->pathways--; 221 222 if (port->num_phys == 1) { 223 sas_unregister_domain_devices(port, gone); 224 sas_destruct_devices(port); 225 sas_port_delete(port->port); 226 port->port = NULL; 227 } else { 228 sas_port_delete_phy(port->port, phy->phy); 229 sas_device_set_phy(dev, port->port); 230 } 231 232 if (si->dft->lldd_port_deformed) 233 si->dft->lldd_port_deformed(phy); 234 235 spin_lock_irqsave(&sas_ha->phy_port_lock, flags); 236 spin_lock(&port->phy_list_lock); 237 238 list_del_init(&phy->port_phy_el); 239 sas_phy_set_target(phy, NULL); 240 phy->port = NULL; 241 port->num_phys--; 242 port->phy_mask &= ~(1U << phy->id); 243 244 if (port->num_phys == 0) { 245 INIT_LIST_HEAD(&port->phy_list); 246 memset(port->sas_addr, 0, SAS_ADDR_SIZE); 247 memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE); 248 port->class = 0; 249 port->iproto = 0; 250 port->tproto = 0; 251 port->oob_mode = 0; 252 port->phy_mask = 0; 253 } 254 spin_unlock(&port->phy_list_lock); 255 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags); 256 257 return; 258 } 259 260 /* ---------- SAS port events ---------- */ 261 262 void sas_porte_bytes_dmaed(struct work_struct *work) 263 { 264 struct asd_sas_event *ev = to_asd_sas_event(work); 265 struct asd_sas_phy *phy = ev->phy; 266 267 sas_form_port(phy); 268 } 269 270 void sas_porte_broadcast_rcvd(struct work_struct *work) 271 { 272 struct asd_sas_event *ev = to_asd_sas_event(work); 273 struct asd_sas_phy *phy = ev->phy; 274 unsigned long flags; 275 u32 prim; 276 277 spin_lock_irqsave(&phy->sas_prim_lock, flags); 278 prim = phy->sas_prim; 279 spin_unlock_irqrestore(&phy->sas_prim_lock, flags); 280 281 pr_debug("broadcast received: %d\n", prim); 282 sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN); 283 284 if (phy->port) 285 flush_workqueue(phy->port->ha->disco_q); 286 } 287 288 void sas_porte_link_reset_err(struct work_struct *work) 289 { 290 struct asd_sas_event *ev = to_asd_sas_event(work); 291 struct asd_sas_phy *phy = ev->phy; 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 sas_deform_port(phy, 1); 302 } 303 304 void sas_porte_hard_reset(struct work_struct *work) 305 { 306 struct asd_sas_event *ev = to_asd_sas_event(work); 307 struct asd_sas_phy *phy = ev->phy; 308 309 sas_deform_port(phy, 1); 310 } 311 312 /* ---------- SAS port registration ---------- */ 313 314 static void sas_init_port(struct asd_sas_port *port, 315 struct sas_ha_struct *sas_ha, int i) 316 { 317 memset(port, 0, sizeof(*port)); 318 port->id = i; 319 INIT_LIST_HEAD(&port->dev_list); 320 INIT_LIST_HEAD(&port->disco_list); 321 INIT_LIST_HEAD(&port->destroy_list); 322 INIT_LIST_HEAD(&port->sas_port_del_list); 323 spin_lock_init(&port->phy_list_lock); 324 INIT_LIST_HEAD(&port->phy_list); 325 port->ha = sas_ha; 326 327 spin_lock_init(&port->dev_list_lock); 328 } 329 330 int sas_register_ports(struct sas_ha_struct *sas_ha) 331 { 332 int i; 333 334 /* initialize the ports and discovery */ 335 for (i = 0; i < sas_ha->num_phys; i++) { 336 struct asd_sas_port *port = sas_ha->sas_port[i]; 337 338 sas_init_port(port, sas_ha, i); 339 sas_init_disc(&port->disc, port); 340 } 341 return 0; 342 } 343 344 void sas_unregister_ports(struct sas_ha_struct *sas_ha) 345 { 346 int i; 347 348 for (i = 0; i < sas_ha->num_phys; i++) 349 if (sas_ha->sas_phy[i]->port) 350 sas_deform_port(sas_ha->sas_phy[i], 0); 351 352 } 353 354 const work_func_t sas_port_event_fns[PORT_NUM_EVENTS] = { 355 [PORTE_BYTES_DMAED] = sas_porte_bytes_dmaed, 356 [PORTE_BROADCAST_RCVD] = sas_porte_broadcast_rcvd, 357 [PORTE_LINK_RESET_ERR] = sas_porte_link_reset_err, 358 [PORTE_TIMER_EVENT] = sas_porte_timer_event, 359 [PORTE_HARD_RESET] = sas_porte_hard_reset, 360 }; 361