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![Bart Van Assche](/assets/img/avatar_default.png)
Avoid that building with W=1 causes the kernel-doc tool to complain about function arguments that have not been documented in the libsas kernel-doc headers. Avoid that the short description starts with a hyphen by changing "--" into "-" in the first line of the kernel-doc headers. Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Cc: John Garry <john.garry@huawei.com> Reviewed-by: John Garry <john.garry@huawei.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
683 lines
17 KiB
C
683 lines
17 KiB
C
/*
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* Serial Attached SCSI (SAS) Transport Layer initialization
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*
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* Copyright (C) 2005 Adaptec, Inc. All rights reserved.
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* Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
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*
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* This file is licensed under GPLv2.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/spinlock.h>
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#include <scsi/sas_ata.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_transport.h>
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#include <scsi/scsi_transport_sas.h>
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#include "sas_internal.h"
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#include "../scsi_sas_internal.h"
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static struct kmem_cache *sas_task_cache;
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static struct kmem_cache *sas_event_cache;
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struct sas_task *sas_alloc_task(gfp_t flags)
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{
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struct sas_task *task = kmem_cache_zalloc(sas_task_cache, flags);
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if (task) {
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spin_lock_init(&task->task_state_lock);
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task->task_state_flags = SAS_TASK_STATE_PENDING;
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}
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return task;
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}
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EXPORT_SYMBOL_GPL(sas_alloc_task);
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struct sas_task *sas_alloc_slow_task(gfp_t flags)
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{
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struct sas_task *task = sas_alloc_task(flags);
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struct sas_task_slow *slow = kmalloc(sizeof(*slow), flags);
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if (!task || !slow) {
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if (task)
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kmem_cache_free(sas_task_cache, task);
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kfree(slow);
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return NULL;
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}
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task->slow_task = slow;
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slow->task = task;
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timer_setup(&slow->timer, NULL, 0);
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init_completion(&slow->completion);
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return task;
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}
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EXPORT_SYMBOL_GPL(sas_alloc_slow_task);
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void sas_free_task(struct sas_task *task)
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{
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if (task) {
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kfree(task->slow_task);
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kmem_cache_free(sas_task_cache, task);
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}
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}
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EXPORT_SYMBOL_GPL(sas_free_task);
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/*------------ SAS addr hash -----------*/
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void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
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{
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const u32 poly = 0x00DB2777;
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u32 r = 0;
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int i;
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for (i = 0; i < 8; i++) {
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int b;
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for (b = 7; b >= 0; b--) {
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r <<= 1;
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if ((1 << b) & sas_addr[i]) {
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if (!(r & 0x01000000))
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r ^= poly;
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} else if (r & 0x01000000)
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r ^= poly;
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}
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}
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hashed[0] = (r >> 16) & 0xFF;
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hashed[1] = (r >> 8) & 0xFF ;
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hashed[2] = r & 0xFF;
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}
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int sas_register_ha(struct sas_ha_struct *sas_ha)
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{
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char name[64];
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int error = 0;
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mutex_init(&sas_ha->disco_mutex);
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spin_lock_init(&sas_ha->phy_port_lock);
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sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);
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set_bit(SAS_HA_REGISTERED, &sas_ha->state);
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spin_lock_init(&sas_ha->lock);
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mutex_init(&sas_ha->drain_mutex);
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init_waitqueue_head(&sas_ha->eh_wait_q);
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INIT_LIST_HEAD(&sas_ha->defer_q);
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INIT_LIST_HEAD(&sas_ha->eh_dev_q);
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sas_ha->event_thres = SAS_PHY_SHUTDOWN_THRES;
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error = sas_register_phys(sas_ha);
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if (error) {
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printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
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return error;
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}
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error = sas_register_ports(sas_ha);
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if (error) {
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printk(KERN_NOTICE "couldn't register sas ports:%d\n", error);
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goto Undo_phys;
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}
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error = sas_init_events(sas_ha);
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if (error) {
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printk(KERN_NOTICE "couldn't start event thread:%d\n", error);
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goto Undo_ports;
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}
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error = -ENOMEM;
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snprintf(name, sizeof(name), "%s_event_q", dev_name(sas_ha->dev));
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sas_ha->event_q = create_singlethread_workqueue(name);
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if (!sas_ha->event_q)
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goto Undo_ports;
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snprintf(name, sizeof(name), "%s_disco_q", dev_name(sas_ha->dev));
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sas_ha->disco_q = create_singlethread_workqueue(name);
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if (!sas_ha->disco_q)
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goto Undo_event_q;
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INIT_LIST_HEAD(&sas_ha->eh_done_q);
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INIT_LIST_HEAD(&sas_ha->eh_ata_q);
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return 0;
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Undo_event_q:
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destroy_workqueue(sas_ha->event_q);
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Undo_ports:
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sas_unregister_ports(sas_ha);
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Undo_phys:
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return error;
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}
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static void sas_disable_events(struct sas_ha_struct *sas_ha)
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{
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/* Set the state to unregistered to avoid further unchained
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* events to be queued, and flush any in-progress drainers
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*/
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mutex_lock(&sas_ha->drain_mutex);
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spin_lock_irq(&sas_ha->lock);
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clear_bit(SAS_HA_REGISTERED, &sas_ha->state);
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spin_unlock_irq(&sas_ha->lock);
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__sas_drain_work(sas_ha);
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mutex_unlock(&sas_ha->drain_mutex);
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}
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int sas_unregister_ha(struct sas_ha_struct *sas_ha)
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{
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sas_disable_events(sas_ha);
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sas_unregister_ports(sas_ha);
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/* flush unregistration work */
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mutex_lock(&sas_ha->drain_mutex);
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__sas_drain_work(sas_ha);
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mutex_unlock(&sas_ha->drain_mutex);
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destroy_workqueue(sas_ha->disco_q);
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destroy_workqueue(sas_ha->event_q);
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return 0;
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}
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static int sas_get_linkerrors(struct sas_phy *phy)
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{
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if (scsi_is_sas_phy_local(phy)) {
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struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
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struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
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struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
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struct sas_internal *i =
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to_sas_internal(sas_ha->core.shost->transportt);
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return i->dft->lldd_control_phy(asd_phy, PHY_FUNC_GET_EVENTS, NULL);
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}
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return sas_smp_get_phy_events(phy);
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}
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int sas_try_ata_reset(struct asd_sas_phy *asd_phy)
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{
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struct domain_device *dev = NULL;
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/* try to route user requested link resets through libata */
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if (asd_phy->port)
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dev = asd_phy->port->port_dev;
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/* validate that dev has been probed */
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if (dev)
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dev = sas_find_dev_by_rphy(dev->rphy);
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if (dev && dev_is_sata(dev)) {
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sas_ata_schedule_reset(dev);
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sas_ata_wait_eh(dev);
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return 0;
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}
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return -ENODEV;
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}
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/*
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* transport_sas_phy_reset - reset a phy and permit libata to manage the link
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*
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* phy reset request via sysfs in host workqueue context so we know we
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* can block on eh and safely traverse the domain_device topology
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*/
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static int transport_sas_phy_reset(struct sas_phy *phy, int hard_reset)
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{
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enum phy_func reset_type;
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if (hard_reset)
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reset_type = PHY_FUNC_HARD_RESET;
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else
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reset_type = PHY_FUNC_LINK_RESET;
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if (scsi_is_sas_phy_local(phy)) {
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struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
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struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
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struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
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struct sas_internal *i =
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to_sas_internal(sas_ha->core.shost->transportt);
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if (!hard_reset && sas_try_ata_reset(asd_phy) == 0)
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return 0;
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return i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
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} else {
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struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
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struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
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struct domain_device *ata_dev = sas_ex_to_ata(ddev, phy->number);
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if (ata_dev && !hard_reset) {
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sas_ata_schedule_reset(ata_dev);
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sas_ata_wait_eh(ata_dev);
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return 0;
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} else
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return sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
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}
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}
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static int sas_phy_enable(struct sas_phy *phy, int enable)
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{
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int ret;
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enum phy_func cmd;
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if (enable)
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cmd = PHY_FUNC_LINK_RESET;
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else
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cmd = PHY_FUNC_DISABLE;
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if (scsi_is_sas_phy_local(phy)) {
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struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
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struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
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struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
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struct sas_internal *i =
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to_sas_internal(sas_ha->core.shost->transportt);
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if (enable)
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ret = transport_sas_phy_reset(phy, 0);
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else
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ret = i->dft->lldd_control_phy(asd_phy, cmd, NULL);
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} else {
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struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
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struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
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if (enable)
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ret = transport_sas_phy_reset(phy, 0);
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else
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ret = sas_smp_phy_control(ddev, phy->number, cmd, NULL);
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}
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return ret;
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}
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int sas_phy_reset(struct sas_phy *phy, int hard_reset)
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{
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int ret;
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enum phy_func reset_type;
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if (!phy->enabled)
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return -ENODEV;
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if (hard_reset)
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reset_type = PHY_FUNC_HARD_RESET;
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else
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reset_type = PHY_FUNC_LINK_RESET;
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if (scsi_is_sas_phy_local(phy)) {
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struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
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struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
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struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
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struct sas_internal *i =
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to_sas_internal(sas_ha->core.shost->transportt);
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ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
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} else {
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struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
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struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
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ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
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}
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return ret;
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}
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int sas_set_phy_speed(struct sas_phy *phy,
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struct sas_phy_linkrates *rates)
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{
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int ret;
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if ((rates->minimum_linkrate &&
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rates->minimum_linkrate > phy->maximum_linkrate) ||
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(rates->maximum_linkrate &&
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rates->maximum_linkrate < phy->minimum_linkrate))
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return -EINVAL;
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if (rates->minimum_linkrate &&
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rates->minimum_linkrate < phy->minimum_linkrate_hw)
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rates->minimum_linkrate = phy->minimum_linkrate_hw;
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if (rates->maximum_linkrate &&
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rates->maximum_linkrate > phy->maximum_linkrate_hw)
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rates->maximum_linkrate = phy->maximum_linkrate_hw;
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if (scsi_is_sas_phy_local(phy)) {
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struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
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struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
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struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
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struct sas_internal *i =
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to_sas_internal(sas_ha->core.shost->transportt);
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ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
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rates);
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} else {
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struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
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struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
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ret = sas_smp_phy_control(ddev, phy->number,
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PHY_FUNC_LINK_RESET, rates);
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}
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return ret;
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}
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void sas_prep_resume_ha(struct sas_ha_struct *ha)
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{
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int i;
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set_bit(SAS_HA_REGISTERED, &ha->state);
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/* clear out any stale link events/data from the suspension path */
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for (i = 0; i < ha->num_phys; i++) {
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struct asd_sas_phy *phy = ha->sas_phy[i];
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memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
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phy->frame_rcvd_size = 0;
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}
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}
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EXPORT_SYMBOL(sas_prep_resume_ha);
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static int phys_suspended(struct sas_ha_struct *ha)
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{
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int i, rc = 0;
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for (i = 0; i < ha->num_phys; i++) {
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struct asd_sas_phy *phy = ha->sas_phy[i];
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if (phy->suspended)
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rc++;
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}
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return rc;
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}
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void sas_resume_ha(struct sas_ha_struct *ha)
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{
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const unsigned long tmo = msecs_to_jiffies(25000);
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int i;
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/* deform ports on phys that did not resume
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* at this point we may be racing the phy coming back (as posted
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* by the lldd). So we post the event and once we are in the
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* libsas context check that the phy remains suspended before
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* tearing it down.
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*/
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i = phys_suspended(ha);
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if (i)
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dev_info(ha->dev, "waiting up to 25 seconds for %d phy%s to resume\n",
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i, i > 1 ? "s" : "");
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wait_event_timeout(ha->eh_wait_q, phys_suspended(ha) == 0, tmo);
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for (i = 0; i < ha->num_phys; i++) {
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struct asd_sas_phy *phy = ha->sas_phy[i];
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if (phy->suspended) {
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dev_warn(&phy->phy->dev, "resume timeout\n");
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sas_notify_phy_event(phy, PHYE_RESUME_TIMEOUT);
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}
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}
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/* all phys are back up or timed out, turn on i/o so we can
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* flush out disks that did not return
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*/
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scsi_unblock_requests(ha->core.shost);
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sas_drain_work(ha);
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}
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EXPORT_SYMBOL(sas_resume_ha);
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void sas_suspend_ha(struct sas_ha_struct *ha)
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{
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int i;
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sas_disable_events(ha);
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scsi_block_requests(ha->core.shost);
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for (i = 0; i < ha->num_phys; i++) {
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struct asd_sas_port *port = ha->sas_port[i];
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sas_discover_event(port, DISCE_SUSPEND);
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}
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/* flush suspend events while unregistered */
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mutex_lock(&ha->drain_mutex);
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__sas_drain_work(ha);
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mutex_unlock(&ha->drain_mutex);
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}
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EXPORT_SYMBOL(sas_suspend_ha);
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static void sas_phy_release(struct sas_phy *phy)
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{
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kfree(phy->hostdata);
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phy->hostdata = NULL;
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}
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static void phy_reset_work(struct work_struct *work)
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{
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struct sas_phy_data *d = container_of(work, typeof(*d), reset_work.work);
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d->reset_result = transport_sas_phy_reset(d->phy, d->hard_reset);
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}
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static void phy_enable_work(struct work_struct *work)
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{
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struct sas_phy_data *d = container_of(work, typeof(*d), enable_work.work);
|
|
|
|
d->enable_result = sas_phy_enable(d->phy, d->enable);
|
|
}
|
|
|
|
static int sas_phy_setup(struct sas_phy *phy)
|
|
{
|
|
struct sas_phy_data *d = kzalloc(sizeof(*d), GFP_KERNEL);
|
|
|
|
if (!d)
|
|
return -ENOMEM;
|
|
|
|
mutex_init(&d->event_lock);
|
|
INIT_SAS_WORK(&d->reset_work, phy_reset_work);
|
|
INIT_SAS_WORK(&d->enable_work, phy_enable_work);
|
|
d->phy = phy;
|
|
phy->hostdata = d;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int queue_phy_reset(struct sas_phy *phy, int hard_reset)
|
|
{
|
|
struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
|
|
struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
|
|
struct sas_phy_data *d = phy->hostdata;
|
|
int rc;
|
|
|
|
if (!d)
|
|
return -ENOMEM;
|
|
|
|
/* libsas workqueue coordinates ata-eh reset with discovery */
|
|
mutex_lock(&d->event_lock);
|
|
d->reset_result = 0;
|
|
d->hard_reset = hard_reset;
|
|
|
|
spin_lock_irq(&ha->lock);
|
|
sas_queue_work(ha, &d->reset_work);
|
|
spin_unlock_irq(&ha->lock);
|
|
|
|
rc = sas_drain_work(ha);
|
|
if (rc == 0)
|
|
rc = d->reset_result;
|
|
mutex_unlock(&d->event_lock);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int queue_phy_enable(struct sas_phy *phy, int enable)
|
|
{
|
|
struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
|
|
struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
|
|
struct sas_phy_data *d = phy->hostdata;
|
|
int rc;
|
|
|
|
if (!d)
|
|
return -ENOMEM;
|
|
|
|
/* libsas workqueue coordinates ata-eh reset with discovery */
|
|
mutex_lock(&d->event_lock);
|
|
d->enable_result = 0;
|
|
d->enable = enable;
|
|
|
|
spin_lock_irq(&ha->lock);
|
|
sas_queue_work(ha, &d->enable_work);
|
|
spin_unlock_irq(&ha->lock);
|
|
|
|
rc = sas_drain_work(ha);
|
|
if (rc == 0)
|
|
rc = d->enable_result;
|
|
mutex_unlock(&d->event_lock);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static struct sas_function_template sft = {
|
|
.phy_enable = queue_phy_enable,
|
|
.phy_reset = queue_phy_reset,
|
|
.phy_setup = sas_phy_setup,
|
|
.phy_release = sas_phy_release,
|
|
.set_phy_speed = sas_set_phy_speed,
|
|
.get_linkerrors = sas_get_linkerrors,
|
|
.smp_handler = sas_smp_handler,
|
|
};
|
|
|
|
static inline ssize_t phy_event_threshold_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct Scsi_Host *shost = class_to_shost(dev);
|
|
struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
|
|
|
|
return scnprintf(buf, PAGE_SIZE, "%u\n", sha->event_thres);
|
|
}
|
|
|
|
static inline ssize_t phy_event_threshold_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct Scsi_Host *shost = class_to_shost(dev);
|
|
struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
|
|
|
|
sha->event_thres = simple_strtol(buf, NULL, 10);
|
|
|
|
/* threshold cannot be set too small */
|
|
if (sha->event_thres < 32)
|
|
sha->event_thres = 32;
|
|
|
|
return count;
|
|
}
|
|
|
|
DEVICE_ATTR(phy_event_threshold,
|
|
S_IRUGO|S_IWUSR,
|
|
phy_event_threshold_show,
|
|
phy_event_threshold_store);
|
|
EXPORT_SYMBOL_GPL(dev_attr_phy_event_threshold);
|
|
|
|
struct scsi_transport_template *
|
|
sas_domain_attach_transport(struct sas_domain_function_template *dft)
|
|
{
|
|
struct scsi_transport_template *stt = sas_attach_transport(&sft);
|
|
struct sas_internal *i;
|
|
|
|
if (!stt)
|
|
return stt;
|
|
|
|
i = to_sas_internal(stt);
|
|
i->dft = dft;
|
|
stt->create_work_queue = 1;
|
|
stt->eh_strategy_handler = sas_scsi_recover_host;
|
|
|
|
return stt;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
|
|
|
|
|
|
struct asd_sas_event *sas_alloc_event(struct asd_sas_phy *phy)
|
|
{
|
|
struct asd_sas_event *event;
|
|
gfp_t flags = in_interrupt() ? GFP_ATOMIC : GFP_KERNEL;
|
|
struct sas_ha_struct *sas_ha = phy->ha;
|
|
struct sas_internal *i =
|
|
to_sas_internal(sas_ha->core.shost->transportt);
|
|
|
|
event = kmem_cache_zalloc(sas_event_cache, flags);
|
|
if (!event)
|
|
return NULL;
|
|
|
|
atomic_inc(&phy->event_nr);
|
|
|
|
if (atomic_read(&phy->event_nr) > phy->ha->event_thres) {
|
|
if (i->dft->lldd_control_phy) {
|
|
if (cmpxchg(&phy->in_shutdown, 0, 1) == 0) {
|
|
sas_printk("The phy%02d bursting events, shut it down.\n",
|
|
phy->id);
|
|
sas_notify_phy_event(phy, PHYE_SHUTDOWN);
|
|
}
|
|
} else {
|
|
/* Do not support PHY control, stop allocating events */
|
|
WARN_ONCE(1, "PHY control not supported.\n");
|
|
kmem_cache_free(sas_event_cache, event);
|
|
atomic_dec(&phy->event_nr);
|
|
event = NULL;
|
|
}
|
|
}
|
|
|
|
return event;
|
|
}
|
|
|
|
void sas_free_event(struct asd_sas_event *event)
|
|
{
|
|
struct asd_sas_phy *phy = event->phy;
|
|
|
|
kmem_cache_free(sas_event_cache, event);
|
|
atomic_dec(&phy->event_nr);
|
|
}
|
|
|
|
/* ---------- SAS Class register/unregister ---------- */
|
|
|
|
static int __init sas_class_init(void)
|
|
{
|
|
sas_task_cache = KMEM_CACHE(sas_task, SLAB_HWCACHE_ALIGN);
|
|
if (!sas_task_cache)
|
|
goto out;
|
|
|
|
sas_event_cache = KMEM_CACHE(asd_sas_event, SLAB_HWCACHE_ALIGN);
|
|
if (!sas_event_cache)
|
|
goto free_task_kmem;
|
|
|
|
return 0;
|
|
free_task_kmem:
|
|
kmem_cache_destroy(sas_task_cache);
|
|
out:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void __exit sas_class_exit(void)
|
|
{
|
|
kmem_cache_destroy(sas_task_cache);
|
|
kmem_cache_destroy(sas_event_cache);
|
|
}
|
|
|
|
MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
|
|
MODULE_DESCRIPTION("SAS Transport Layer");
|
|
MODULE_LICENSE("GPL v2");
|
|
|
|
module_init(sas_class_init);
|
|
module_exit(sas_class_exit);
|
|
|
|
EXPORT_SYMBOL_GPL(sas_register_ha);
|
|
EXPORT_SYMBOL_GPL(sas_unregister_ha);
|