/* * Serial Attached SCSI (SAS) Discover process * * Copyright (C) 2005 Adaptec, Inc. All rights reserved. * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com> * * This file is licensed under GPLv2. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * */ #include <linux/scatterlist.h> #include <scsi/scsi_host.h> #include <scsi/scsi_eh.h> #include "sas_internal.h" #include <scsi/scsi_transport.h> #include <scsi/scsi_transport_sas.h> #include "../scsi_sas_internal.h" /* ---------- Basic task processing for discovery purposes ---------- */ void sas_init_dev(struct domain_device *dev) { INIT_LIST_HEAD(&dev->siblings); INIT_LIST_HEAD(&dev->dev_list_node); switch (dev->dev_type) { case SAS_END_DEV: break; case EDGE_DEV: case FANOUT_DEV: INIT_LIST_HEAD(&dev->ex_dev.children); break; case SATA_DEV: case SATA_PM: case SATA_PM_PORT: INIT_LIST_HEAD(&dev->sata_dev.children); break; default: break; } } /* ---------- Domain device discovery ---------- */ /** * sas_get_port_device -- Discover devices which caused port creation * @port: pointer to struct sas_port of interest * * Devices directly attached to a HA port, have no parent. This is * how we know they are (domain) "root" devices. All other devices * do, and should have their "parent" pointer set appropriately as * soon as a child device is discovered. */ static int sas_get_port_device(struct asd_sas_port *port) { unsigned long flags; struct asd_sas_phy *phy; struct sas_rphy *rphy; struct domain_device *dev; dev = kzalloc(sizeof(*dev), GFP_KERNEL); if (!dev) return -ENOMEM; spin_lock_irqsave(&port->phy_list_lock, flags); if (list_empty(&port->phy_list)) { spin_unlock_irqrestore(&port->phy_list_lock, flags); kfree(dev); return -ENODEV; } phy = container_of(port->phy_list.next, struct asd_sas_phy, port_phy_el); spin_lock(&phy->frame_rcvd_lock); memcpy(dev->frame_rcvd, phy->frame_rcvd, min(sizeof(dev->frame_rcvd), (size_t)phy->frame_rcvd_size)); spin_unlock(&phy->frame_rcvd_lock); spin_unlock_irqrestore(&port->phy_list_lock, flags); if (dev->frame_rcvd[0] == 0x34 && port->oob_mode == SATA_OOB_MODE) { struct dev_to_host_fis *fis = (struct dev_to_host_fis *) dev->frame_rcvd; if (fis->interrupt_reason == 1 && fis->lbal == 1 && fis->byte_count_low==0x69 && fis->byte_count_high == 0x96 && (fis->device & ~0x10) == 0) dev->dev_type = SATA_PM; else dev->dev_type = SATA_DEV; dev->tproto = SATA_PROTO; } else { struct sas_identify_frame *id = (struct sas_identify_frame *) dev->frame_rcvd; dev->dev_type = id->dev_type; dev->iproto = id->initiator_bits; dev->tproto = id->target_bits; } sas_init_dev(dev); switch (dev->dev_type) { case SAS_END_DEV: case SATA_DEV: rphy = sas_end_device_alloc(port->port); break; case EDGE_DEV: rphy = sas_expander_alloc(port->port, SAS_EDGE_EXPANDER_DEVICE); break; case FANOUT_DEV: rphy = sas_expander_alloc(port->port, SAS_FANOUT_EXPANDER_DEVICE); break; default: printk("ERROR: Unidentified device type %d\n", dev->dev_type); rphy = NULL; break; } if (!rphy) { kfree(dev); return -ENODEV; } rphy->identify.phy_identifier = phy->phy->identify.phy_identifier; memcpy(dev->sas_addr, port->attached_sas_addr, SAS_ADDR_SIZE); sas_fill_in_rphy(dev, rphy); sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr); port->port_dev = dev; dev->port = port; dev->linkrate = port->linkrate; dev->min_linkrate = port->linkrate; dev->max_linkrate = port->linkrate; dev->pathways = port->num_phys; memset(port->disc.fanout_sas_addr, 0, SAS_ADDR_SIZE); memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE); memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE); port->disc.max_level = 0; dev->rphy = rphy; spin_lock_irq(&port->dev_list_lock); list_add_tail(&dev->dev_list_node, &port->dev_list); spin_unlock_irq(&port->dev_list_lock); return 0; } /* ---------- Discover and Revalidate ---------- */ int sas_notify_lldd_dev_found(struct domain_device *dev) { int res = 0; struct sas_ha_struct *sas_ha = dev->port->ha; struct Scsi_Host *shost = sas_ha->core.shost; struct sas_internal *i = to_sas_internal(shost->transportt); if (i->dft->lldd_dev_found) { res = i->dft->lldd_dev_found(dev); if (res) { printk("sas: driver on pcidev %s cannot handle " "device %llx, error:%d\n", sas_ha->dev->bus_id, SAS_ADDR(dev->sas_addr), res); } } return res; } void sas_notify_lldd_dev_gone(struct domain_device *dev) { struct sas_ha_struct *sas_ha = dev->port->ha; struct Scsi_Host *shost = sas_ha->core.shost; struct sas_internal *i = to_sas_internal(shost->transportt); if (i->dft->lldd_dev_gone) i->dft->lldd_dev_gone(dev); } /* ---------- Common/dispatchers ---------- */ /** * sas_discover_end_dev -- discover an end device (SSP, etc) * @end: pointer to domain device of interest * * See comment in sas_discover_sata(). */ int sas_discover_end_dev(struct domain_device *dev) { int res; res = sas_notify_lldd_dev_found(dev); if (res) goto out_err2; res = sas_rphy_add(dev->rphy); if (res) goto out_err; return 0; out_err: sas_notify_lldd_dev_gone(dev); out_err2: return res; } /* ---------- Device registration and unregistration ---------- */ static inline void sas_unregister_common_dev(struct domain_device *dev) { sas_notify_lldd_dev_gone(dev); if (!dev->parent) dev->port->port_dev = NULL; else list_del_init(&dev->siblings); list_del_init(&dev->dev_list_node); } void sas_unregister_dev(struct domain_device *dev) { if (dev->rphy) { sas_remove_children(&dev->rphy->dev); sas_rphy_delete(dev->rphy); dev->rphy = NULL; } if (dev->dev_type == EDGE_DEV || dev->dev_type == FANOUT_DEV) { /* remove the phys and ports, everything else should be gone */ kfree(dev->ex_dev.ex_phy); dev->ex_dev.ex_phy = NULL; } sas_unregister_common_dev(dev); } void sas_unregister_domain_devices(struct asd_sas_port *port) { struct domain_device *dev, *n; list_for_each_entry_safe_reverse(dev,n,&port->dev_list,dev_list_node) sas_unregister_dev(dev); port->port->rphy = NULL; } /* ---------- Discovery and Revalidation ---------- */ /** * sas_discover_domain -- discover the domain * @port: port to the domain of interest * * NOTE: this process _must_ quit (return) as soon as any connection * errors are encountered. Connection recovery is done elsewhere. * Discover process only interrogates devices in order to discover the * domain. */ static void sas_discover_domain(struct work_struct *work) { struct domain_device *dev; int error = 0; struct sas_discovery_event *ev = container_of(work, struct sas_discovery_event, work); struct asd_sas_port *port = ev->port; sas_begin_event(DISCE_DISCOVER_DOMAIN, &port->disc.disc_event_lock, &port->disc.pending); if (port->port_dev) return; error = sas_get_port_device(port); if (error) return; dev = port->port_dev; SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port->id, task_pid_nr(current)); switch (dev->dev_type) { case SAS_END_DEV: error = sas_discover_end_dev(dev); break; case EDGE_DEV: case FANOUT_DEV: error = sas_discover_root_expander(dev); break; #ifdef CONFIG_SCSI_SAS_ATA case SATA_DEV: case SATA_PM: error = sas_discover_sata(dev); break; #endif default: error = -ENXIO; SAS_DPRINTK("unhandled device %d\n", dev->dev_type); break; } if (error) { sas_rphy_free(dev->rphy); dev->rphy = NULL; spin_lock_irq(&port->dev_list_lock); list_del_init(&dev->dev_list_node); spin_unlock_irq(&port->dev_list_lock); kfree(dev); /* not kobject_register-ed yet */ port->port_dev = NULL; } SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id, task_pid_nr(current), error); } static void sas_revalidate_domain(struct work_struct *work) { int res = 0; struct sas_discovery_event *ev = container_of(work, struct sas_discovery_event, work); struct asd_sas_port *port = ev->port; sas_begin_event(DISCE_REVALIDATE_DOMAIN, &port->disc.disc_event_lock, &port->disc.pending); SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id, task_pid_nr(current)); if (port->port_dev) res = sas_ex_revalidate_domain(port->port_dev); SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n", port->id, task_pid_nr(current), res); } /* ---------- Events ---------- */ int sas_discover_event(struct asd_sas_port *port, enum discover_event ev) { struct sas_discovery *disc; if (!port) return 0; disc = &port->disc; BUG_ON(ev >= DISC_NUM_EVENTS); sas_queue_event(ev, &disc->disc_event_lock, &disc->pending, &disc->disc_work[ev].work, port->ha); return 0; } /** * sas_init_disc -- initialize the discovery struct in the port * @port: pointer to struct port * * Called when the ports are being initialized. */ void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port) { int i; static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = { [DISCE_DISCOVER_DOMAIN] = sas_discover_domain, [DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain, }; spin_lock_init(&disc->disc_event_lock); disc->pending = 0; for (i = 0; i < DISC_NUM_EVENTS; i++) { INIT_WORK(&disc->disc_work[i].work, sas_event_fns[i]); disc->disc_work[i].port = port; } }