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 sas_phy_set_target(phy, port->port_dev); 108 phy->port = port; 109 port->num_phys++; 110 port->phy_mask |= (1U << phy->id); 111 112 if (*(u64 *)port->attached_sas_addr == 0) { 113 port->class = phy->class; 114 memcpy(port->attached_sas_addr, phy->attached_sas_addr, 115 SAS_ADDR_SIZE); 116 port->iproto = phy->iproto; 117 port->tproto = phy->tproto; 118 port->oob_mode = phy->oob_mode; 119 port->linkrate = phy->linkrate; 120 } else 121 port->linkrate = max(port->linkrate, phy->linkrate); 122 spin_unlock(&port->phy_list_lock); 123 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags); 124 125 if (!port->port) { 126 port->port = sas_port_alloc(phy->phy->dev.parent, phy->id); 127 BUG_ON(!port->port); 128 sas_port_add(port->port); 129 } 130 sas_port_add_phy(port->port, phy->phy); 131 132 SAS_DPRINTK("%s added to %s, phy_mask:0x%x (%16llx)\n", 133 dev_name(&phy->phy->dev), dev_name(&port->port->dev), 134 port->phy_mask, 135 SAS_ADDR(port->attached_sas_addr)); 136 137 if (port->port_dev) 138 port->port_dev->pathways = port->num_phys; 139 140 /* Tell the LLDD about this port formation. */ 141 if (si->dft->lldd_port_formed) 142 si->dft->lldd_port_formed(phy); 143 144 sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN); 145 } 146 147 /** 148 * sas_deform_port -- remove this phy from the port it belongs to 149 * @phy: the phy of interest 150 * 151 * This is called when the physical link to the other phy has been 152 * lost (on this phy), in Event thread context. We cannot delay here. 153 */ 154 void sas_deform_port(struct asd_sas_phy *phy, int gone) 155 { 156 struct sas_ha_struct *sas_ha = phy->ha; 157 struct asd_sas_port *port = phy->port; 158 struct sas_internal *si = 159 to_sas_internal(sas_ha->core.shost->transportt); 160 struct domain_device *dev; 161 unsigned long flags; 162 163 if (!port) 164 return; /* done by a phy event */ 165 166 dev = port->port_dev; 167 if (dev) 168 dev->pathways--; 169 170 if (port->num_phys == 1) { 171 sas_unregister_domain_devices(port, gone); 172 sas_port_delete(port->port); 173 port->port = NULL; 174 } else { 175 sas_port_delete_phy(port->port, phy->phy); 176 sas_device_set_phy(dev, port->port); 177 } 178 179 if (si->dft->lldd_port_deformed) 180 si->dft->lldd_port_deformed(phy); 181 182 spin_lock_irqsave(&sas_ha->phy_port_lock, flags); 183 spin_lock(&port->phy_list_lock); 184 185 list_del_init(&phy->port_phy_el); 186 sas_phy_set_target(phy, NULL); 187 phy->port = NULL; 188 port->num_phys--; 189 port->phy_mask &= ~(1U << phy->id); 190 191 if (port->num_phys == 0) { 192 INIT_LIST_HEAD(&port->phy_list); 193 memset(port->sas_addr, 0, SAS_ADDR_SIZE); 194 memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE); 195 port->class = 0; 196 port->iproto = 0; 197 port->tproto = 0; 198 port->oob_mode = 0; 199 port->phy_mask = 0; 200 } 201 spin_unlock(&port->phy_list_lock); 202 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags); 203 204 return; 205 } 206 207 /* ---------- SAS port events ---------- */ 208 209 void sas_porte_bytes_dmaed(struct work_struct *work) 210 { 211 struct asd_sas_event *ev = 212 container_of(work, struct asd_sas_event, work); 213 struct asd_sas_phy *phy = ev->phy; 214 215 clear_bit(PORTE_BYTES_DMAED, &phy->port_events_pending); 216 217 sas_form_port(phy); 218 } 219 220 void sas_porte_broadcast_rcvd(struct work_struct *work) 221 { 222 struct asd_sas_event *ev = 223 container_of(work, struct asd_sas_event, work); 224 struct asd_sas_phy *phy = ev->phy; 225 unsigned long flags; 226 u32 prim; 227 228 clear_bit(PORTE_BROADCAST_RCVD, &phy->port_events_pending); 229 230 spin_lock_irqsave(&phy->sas_prim_lock, flags); 231 prim = phy->sas_prim; 232 spin_unlock_irqrestore(&phy->sas_prim_lock, flags); 233 234 SAS_DPRINTK("broadcast received: %d\n", prim); 235 sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN); 236 } 237 238 void sas_porte_link_reset_err(struct work_struct *work) 239 { 240 struct asd_sas_event *ev = 241 container_of(work, struct asd_sas_event, work); 242 struct asd_sas_phy *phy = ev->phy; 243 244 clear_bit(PORTE_LINK_RESET_ERR, &phy->port_events_pending); 245 246 sas_deform_port(phy, 1); 247 } 248 249 void sas_porte_timer_event(struct work_struct *work) 250 { 251 struct asd_sas_event *ev = 252 container_of(work, struct asd_sas_event, work); 253 struct asd_sas_phy *phy = ev->phy; 254 255 clear_bit(PORTE_TIMER_EVENT, &phy->port_events_pending); 256 257 sas_deform_port(phy, 1); 258 } 259 260 void sas_porte_hard_reset(struct work_struct *work) 261 { 262 struct asd_sas_event *ev = 263 container_of(work, struct asd_sas_event, work); 264 struct asd_sas_phy *phy = ev->phy; 265 266 clear_bit(PORTE_HARD_RESET, &phy->port_events_pending); 267 268 sas_deform_port(phy, 1); 269 } 270 271 /* ---------- SAS port registration ---------- */ 272 273 static void sas_init_port(struct asd_sas_port *port, 274 struct sas_ha_struct *sas_ha, int i) 275 { 276 memset(port, 0, sizeof(*port)); 277 port->id = i; 278 INIT_LIST_HEAD(&port->dev_list); 279 INIT_LIST_HEAD(&port->disco_list); 280 INIT_LIST_HEAD(&port->destroy_list); 281 spin_lock_init(&port->phy_list_lock); 282 INIT_LIST_HEAD(&port->phy_list); 283 port->ha = sas_ha; 284 285 spin_lock_init(&port->dev_list_lock); 286 } 287 288 int sas_register_ports(struct sas_ha_struct *sas_ha) 289 { 290 int i; 291 292 /* initialize the ports and discovery */ 293 for (i = 0; i < sas_ha->num_phys; i++) { 294 struct asd_sas_port *port = sas_ha->sas_port[i]; 295 296 sas_init_port(port, sas_ha, i); 297 sas_init_disc(&port->disc, port); 298 } 299 return 0; 300 } 301 302 void sas_unregister_ports(struct sas_ha_struct *sas_ha) 303 { 304 int i; 305 306 for (i = 0; i < sas_ha->num_phys; i++) 307 if (sas_ha->sas_phy[i]->port) 308 sas_deform_port(sas_ha->sas_phy[i], 0); 309 310 } 311