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