cregit-Linux how code gets into the kernel

Release 4.11 drivers/scsi/libsas/sas_discover.c

/*
 * 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 <linux/async.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_DEVICE: INIT_LIST_HEAD(&dev->ssp_dev.eh_list_node); break; case SAS_EDGE_EXPANDER_DEVICE: case SAS_FANOUT_EXPANDER_DEVICE: INIT_LIST_HEAD(&dev->ex_dev.children); mutex_init(&dev->ex_dev.cmd_mutex); break; default: break; } }

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Dan J Williams1016.39%125.00%
Total61100.00%4100.00%

/* ---------- 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 = SAS_SATA_PM; else dev->dev_type = SAS_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 SAS_SATA_DEV: rc = sas_ata_init(dev); if (rc) { rphy = NULL; break; } /* fall through */ case SAS_END_DEVICE: rphy = sas_end_device_alloc(port->port); break; case SAS_EDGE_EXPANDER_DEVICE: rphy = sas_expander_alloc(port->port, SAS_EDGE_EXPANDER_DEVICE); break; case SAS_FANOUT_EXPANDER_DEVICE: 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_DEVICE) 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; }

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James Bottomley51980.84%533.33%
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Darrick J. Wong60.93%213.33%
Total642100.00%15100.00%

/* ---------- 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) return 0; 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); } set_bit(SAS_DEV_FOUND, &dev->state); kref_get(&dev->kref); return res; }

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James Bottomley9578.51%120.00%
Dan J Williams2218.18%240.00%
Kay Sievers32.48%120.00%
Jeff Garzik10.83%120.00%
Total121100.00%5100.00%


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) return; if (test_and_clear_bit(SAS_DEV_FOUND, &dev->state)) { i->dft->lldd_dev_gone(dev); sas_put_device(dev); } }

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James Bottomley6174.39%133.33%
Dan J Williams2125.61%266.67%
Total82100.00%3100.00%


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); } }

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Dan J Williams141100.00%3100.00%
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static void sas_suspend_devices(struct work_struct *work) { struct asd_sas_phy *phy; struct domain_device *dev; struct sas_discovery_event *ev = to_sas_discovery_event(work); struct asd_sas_port *port = ev->port; struct Scsi_Host *shost = port->ha->core.shost; struct sas_internal *si = to_sas_internal(shost->transportt); clear_bit(DISCE_SUSPEND, &port->disc.pending); sas_suspend_sata(port); /* lldd is free to forget the domain_device across the * suspension, we force the issue here to keep the reference * counts aligned */ list_for_each_entry(dev, &port->dev_list, dev_list_node) sas_notify_lldd_dev_gone(dev); /* we are suspending, so we know events are disabled and * phy_list is not being mutated */ list_for_each_entry(phy, &port->phy_list, port_phy_el) { if (si->dft->lldd_port_formed) si->dft->lldd_port_deformed(phy); phy->suspended = 1; port->suspended = 1; } }

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static void sas_resume_devices(struct work_struct *work) { struct sas_discovery_event *ev = to_sas_discovery_event(work); struct asd_sas_port *port = ev->port; clear_bit(DISCE_RESUME, &port->disc.pending); sas_resume_sata(port); }

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Dan J Williams47100.00%1100.00%
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/** * 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; }

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James Bottomley3384.62%150.00%
Dan J Williams615.38%150.00%
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/* ---------- 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 == SAS_EDGE_EXPANDER_DEVICE || dev->dev_type == SAS_FANOUT_EXPANDER_DEVICE) 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); }

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Dan J Williams12998.47%480.00%
James Bottomley21.53%120.00%
Total131100.00%5100.00%


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_DEVICE && !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); }

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Dan J Williams10267.55%466.67%
James Bottomley4932.45%233.33%
Total151100.00%6100.00%


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); } }

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Dan J Williams94100.00%2100.00%
Total94100.00%2100.00%


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); } }

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Dan J Williams7469.16%375.00%
James Bottomley3330.84%125.00%
Total107100.00%4100.00%


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; }

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James Bottomley4151.90%125.00%
Dan J Williams3848.10%375.00%
Total79100.00%4100.00%


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); }

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Dan J Williams82100.00%1100.00%
Total82100.00%1100.00%

/* ---------- 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_DEVICE: error = sas_discover_end_dev(dev); break; case SAS_EDGE_EXPANDER_DEVICE: case SAS_FANOUT_EXPANDER_DEVICE: error = sas_discover_root_expander(dev); break; case SAS_SATA_DEV: case SAS_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); }

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James Bottomley16066.95%538.46%
Darrick J. Wong4719.67%215.38%
David Howells156.28%17.69%
Dan J Williams114.60%430.77%
Pavel Emelyanov62.51%17.69%
Total239100.00%13100.00%


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; struct domain_device *ddev = port->port_dev; /* 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 (ddev && (ddev->dev_type == SAS_FANOUT_EXPANDER_DEVICE || ddev->dev_type == SAS_EDGE_EXPANDER_DEVICE)) res = sas_ex_revalidate_domain(ddev); 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); }

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James Bottomley8851.76%228.57%
Dan J Williams6135.88%342.86%
David Howells158.82%114.29%
Pavel Emelyanov63.53%114.29%
Total170100.00%7100.00%

/* ---------- 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); }

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Dan J Williams31100.00%2100.00%
Total31100.00%2100.00%


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); } }

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Dan J Williams67100.00%3100.00%
Total67100.00%3100.00%


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; }

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James Bottomley6595.59%133.33%
David Howells22.94%133.33%
Dan J Williams11.47%133.33%
Total68100.00%3100.00%

/** * 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_SUSPEND] = sas_suspend_devices, [DISCE_RESUME] = sas_resume_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; } }

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James Bottomley6456.14%116.67%
David Howells2521.93%116.67%
Dan J Williams2521.93%466.67%
Total114100.00%6100.00%


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James Bottomley128348.54%821.62%
Dan J Williams122146.20%1951.35%
David Howells572.16%12.70%
Darrick J. Wong532.01%410.81%
Pavel Emelyanov120.45%12.70%
Jeff Skirvin100.38%12.70%
Kay Sievers30.11%12.70%
Tejun Heo30.11%12.70%
Jeff Garzik10.04%12.70%
Total2643100.00%37100.00%
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