| /* |
| * 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 <linux/slab.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_ata.h> |
| #include "../scsi_sas_internal.h" |
| |
| /* ---------- Basic task processing for discovery purposes ---------- */ |
| |
| void sas_init_dev(struct domain_device *dev) |
| { |
| switch (dev->dev_type) { |
| case SAS_END_DEV: |
| INIT_LIST_HEAD(&dev->ssp_dev.eh_list_node); |
| break; |
| case EDGE_DEV: |
| case FANOUT_DEV: |
| INIT_LIST_HEAD(&dev->ex_dev.children); |
| mutex_init(&dev->ex_dev.cmd_mutex); |
| 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) |
| { |
| struct asd_sas_phy *phy; |
| struct sas_rphy *rphy; |
| struct domain_device *dev; |
| int rc = -ENODEV; |
| |
| dev = sas_alloc_device(); |
| if (!dev) |
| return -ENOMEM; |
| |
| spin_lock_irq(&port->phy_list_lock); |
| if (list_empty(&port->phy_list)) { |
| spin_unlock_irq(&port->phy_list_lock); |
| sas_put_device(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_irq(&port->phy_list_lock); |
| |
| 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 = SAS_PROTOCOL_SATA; |
| } 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); |
| |
| dev->port = port; |
| switch (dev->dev_type) { |
| case SATA_DEV: |
| rc = sas_ata_init(dev); |
| if (rc) { |
| rphy = NULL; |
| break; |
| } |
| /* fall through */ |
| case SAS_END_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) { |
| sas_put_device(dev); |
| return rc; |
| } |
| |
| 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->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; |
| sas_device_set_phy(dev, port->port); |
| |
| dev->rphy = rphy; |
| get_device(&dev->rphy->dev); |
| |
| if (dev_is_sata(dev) || dev->dev_type == SAS_END_DEV) |
| list_add_tail(&dev->disco_list_node, &port->disco_list); |
| else { |
| spin_lock_irq(&port->dev_list_lock); |
| list_add_tail(&dev->dev_list_node, &port->dev_list); |
| spin_unlock_irq(&port->dev_list_lock); |
| } |
| |
| spin_lock_irq(&port->phy_list_lock); |
| list_for_each_entry(phy, &port->phy_list, port_phy_el) |
| sas_phy_set_target(phy, dev); |
| spin_unlock_irq(&port->phy_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", |
| dev_name(sas_ha->dev), |
| SAS_ADDR(dev->sas_addr), res); |
| } |
| kref_get(&dev->kref); |
| } |
| 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); |
| sas_put_device(dev); |
| } |
| } |
| |
| static void sas_probe_devices(struct work_struct *work) |
| { |
| struct domain_device *dev, *n; |
| struct sas_discovery_event *ev = to_sas_discovery_event(work); |
| struct asd_sas_port *port = ev->port; |
| |
| clear_bit(DISCE_PROBE, &port->disc.pending); |
| |
| /* devices must be domain members before link recovery and probe */ |
| list_for_each_entry(dev, &port->disco_list, disco_list_node) { |
| spin_lock_irq(&port->dev_list_lock); |
| list_add_tail(&dev->dev_list_node, &port->dev_list); |
| spin_unlock_irq(&port->dev_list_lock); |
| } |
| |
| sas_probe_sata(port); |
| |
| list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) { |
| int err; |
| |
| err = sas_rphy_add(dev->rphy); |
| if (err) |
| sas_fail_probe(dev, __func__, err); |
| else |
| list_del_init(&dev->disco_list_node); |
| } |
| } |
| |
| /** |
| * 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) |
| return res; |
| sas_discover_event(dev->port, DISCE_PROBE); |
| |
| return 0; |
| } |
| |
| /* ---------- Device registration and unregistration ---------- */ |
| |
| void sas_free_device(struct kref *kref) |
| { |
| struct domain_device *dev = container_of(kref, typeof(*dev), kref); |
| |
| put_device(&dev->rphy->dev); |
| dev->rphy = NULL; |
| |
| if (dev->parent) |
| sas_put_device(dev->parent); |
| |
| sas_port_put_phy(dev->phy); |
| dev->phy = NULL; |
| |
| /* remove the phys and ports, everything else should be gone */ |
| if (dev->dev_type == EDGE_DEV || dev->dev_type == FANOUT_DEV) |
| kfree(dev->ex_dev.ex_phy); |
| |
| if (dev_is_sata(dev) && dev->sata_dev.ap) { |
| ata_sas_port_destroy(dev->sata_dev.ap); |
| dev->sata_dev.ap = NULL; |
| } |
| |
| kfree(dev); |
| } |
| |
| static void sas_unregister_common_dev(struct asd_sas_port *port, struct domain_device *dev) |
| { |
| struct sas_ha_struct *ha = port->ha; |
| |
| sas_notify_lldd_dev_gone(dev); |
| if (!dev->parent) |
| dev->port->port_dev = NULL; |
| else |
| list_del_init(&dev->siblings); |
| |
| spin_lock_irq(&port->dev_list_lock); |
| list_del_init(&dev->dev_list_node); |
| if (dev_is_sata(dev)) |
| sas_ata_end_eh(dev->sata_dev.ap); |
| spin_unlock_irq(&port->dev_list_lock); |
| |
| spin_lock_irq(&ha->lock); |
| if (dev->dev_type == SAS_END_DEV && |
| !list_empty(&dev->ssp_dev.eh_list_node)) { |
| list_del_init(&dev->ssp_dev.eh_list_node); |
| ha->eh_active--; |
| } |
| spin_unlock_irq(&ha->lock); |
| |
| sas_put_device(dev); |
| } |
| |
| static void sas_destruct_devices(struct work_struct *work) |
| { |
| struct domain_device *dev, *n; |
| struct sas_discovery_event *ev = to_sas_discovery_event(work); |
| struct asd_sas_port *port = ev->port; |
| |
| clear_bit(DISCE_DESTRUCT, &port->disc.pending); |
| |
| list_for_each_entry_safe(dev, n, &port->destroy_list, disco_list_node) { |
| list_del_init(&dev->disco_list_node); |
| |
| sas_remove_children(&dev->rphy->dev); |
| sas_rphy_delete(dev->rphy); |
| sas_unregister_common_dev(port, dev); |
| } |
| } |
| |
| void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev) |
| { |
| if (!test_bit(SAS_DEV_DESTROY, &dev->state) && |
| !list_empty(&dev->disco_list_node)) { |
| /* this rphy never saw sas_rphy_add */ |
| list_del_init(&dev->disco_list_node); |
| sas_rphy_free(dev->rphy); |
| sas_unregister_common_dev(port, dev); |
| return; |
| } |
| |
| if (!test_and_set_bit(SAS_DEV_DESTROY, &dev->state)) { |
| sas_rphy_unlink(dev->rphy); |
| list_move_tail(&dev->disco_list_node, &port->destroy_list); |
| sas_discover_event(dev->port, DISCE_DESTRUCT); |
| } |
| } |
| |
| void sas_unregister_domain_devices(struct asd_sas_port *port, int gone) |
| { |
| struct domain_device *dev, *n; |
| |
| list_for_each_entry_safe_reverse(dev, n, &port->dev_list, dev_list_node) { |
| if (gone) |
| set_bit(SAS_DEV_GONE, &dev->state); |
| sas_unregister_dev(port, dev); |
| } |
| |
| list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) |
| sas_unregister_dev(port, dev); |
| |
| port->port->rphy = NULL; |
| |
| } |
| |
| void sas_device_set_phy(struct domain_device *dev, struct sas_port *port) |
| { |
| struct sas_ha_struct *ha; |
| struct sas_phy *new_phy; |
| |
| if (!dev) |
| return; |
| |
| ha = dev->port->ha; |
| new_phy = sas_port_get_phy(port); |
| |
| /* pin and record last seen phy */ |
| spin_lock_irq(&ha->phy_port_lock); |
| if (new_phy) { |
| sas_port_put_phy(dev->phy); |
| dev->phy = new_phy; |
| } |
| spin_unlock_irq(&ha->phy_port_lock); |
| } |
| |
| /* ---------- 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 = to_sas_discovery_event(work); |
| struct asd_sas_port *port = ev->port; |
| |
| clear_bit(DISCE_DISCOVER_DOMAIN, &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; |
| case SATA_DEV: |
| case SATA_PM: |
| #ifdef CONFIG_SCSI_SAS_ATA |
| error = sas_discover_sata(dev); |
| break; |
| #else |
| SAS_DPRINTK("ATA device seen but CONFIG_SCSI_SAS_ATA=N so cannot attach\n"); |
| /* Fall through */ |
| #endif |
| default: |
| error = -ENXIO; |
| SAS_DPRINTK("unhandled device %d\n", dev->dev_type); |
| break; |
| } |
| |
| if (error) { |
| sas_rphy_free(dev->rphy); |
| list_del_init(&dev->disco_list_node); |
| spin_lock_irq(&port->dev_list_lock); |
| list_del_init(&dev->dev_list_node); |
| spin_unlock_irq(&port->dev_list_lock); |
| |
| sas_put_device(dev); |
| 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 = to_sas_discovery_event(work); |
| struct asd_sas_port *port = ev->port; |
| struct sas_ha_struct *ha = port->ha; |
| |
| /* prevent revalidation from finding sata links in recovery */ |
| mutex_lock(&ha->disco_mutex); |
| if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) { |
| SAS_DPRINTK("REVALIDATION DEFERRED on port %d, pid:%d\n", |
| port->id, task_pid_nr(current)); |
| goto out; |
| } |
| |
| clear_bit(DISCE_REVALIDATE_DOMAIN, &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); |
| out: |
| mutex_unlock(&ha->disco_mutex); |
| } |
| |
| /* ---------- Events ---------- */ |
| |
| static void sas_chain_work(struct sas_ha_struct *ha, struct sas_work *sw) |
| { |
| /* chained work is not subject to SA_HA_DRAINING or |
| * SAS_HA_REGISTERED, because it is either submitted in the |
| * workqueue, or known to be submitted from a context that is |
| * not racing against draining |
| */ |
| scsi_queue_work(ha->core.shost, &sw->work); |
| } |
| |
| static void sas_chain_event(int event, unsigned long *pending, |
| struct sas_work *sw, |
| struct sas_ha_struct *ha) |
| { |
| if (!test_and_set_bit(event, pending)) { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&ha->lock, flags); |
| sas_chain_work(ha, sw); |
| spin_unlock_irqrestore(&ha->lock, flags); |
| } |
| } |
| |
| 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_chain_event(ev, &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, |
| [DISCE_PROBE] = sas_probe_devices, |
| [DISCE_DESTRUCT] = sas_destruct_devices, |
| }; |
| |
| disc->pending = 0; |
| for (i = 0; i < DISC_NUM_EVENTS; i++) { |
| INIT_SAS_WORK(&disc->disc_work[i].work, sas_event_fns[i]); |
| disc->disc_work[i].port = port; |
| } |
| } |