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![Christoph Hellwig](/assets/img/avatar_default.png)
The task_collector mode (or "latency_injector", (C) Dan Willians) is an optional I/O path in libsas that queues up scsi commands instead of directly sending it to the hardware. It generall increases latencies to in the optiomal case slightly reduce mmio traffic to the hardware. Only the obsolete aic94xx driver and the mvsas driver allowed to use it without recompiling the kernel, and most drivers didn't support it at all. Remove the giant blob of code to allow better optimizations for scsi-mq in the future. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Acked-by: Dan Williams <dan.j.williams@intel.com>
601 lines
15 KiB
C
601 lines
15 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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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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init_timer(&slow->timer);
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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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/* ---------- HA events ---------- */
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void sas_hae_reset(struct work_struct *work)
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{
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struct sas_ha_event *ev = to_sas_ha_event(work);
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struct sas_ha_struct *ha = ev->ha;
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clear_bit(HAE_RESET, &ha->pending);
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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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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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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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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_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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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->port_events_pending = 0;
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phy->phy_events_pending = 0;
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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);
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d->enable_result = sas_phy_enable(d->phy, d->enable);
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}
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static int sas_phy_setup(struct sas_phy *phy)
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{
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struct sas_phy_data *d = kzalloc(sizeof(*d), GFP_KERNEL);
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if (!d)
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return -ENOMEM;
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|
|
|
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,
|
|
};
|
|
|
|
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_timed_out = sas_scsi_timed_out;
|
|
stt->eh_strategy_handler = sas_scsi_recover_host;
|
|
|
|
return stt;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
|
|
|
|
|
|
void sas_domain_release_transport(struct scsi_transport_template *stt)
|
|
{
|
|
sas_release_transport(stt);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sas_domain_release_transport);
|
|
|
|
/* ---------- 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)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit sas_class_exit(void)
|
|
{
|
|
kmem_cache_destroy(sas_task_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);
|