347 lines
8.9 KiB
C
347 lines
8.9 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/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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INIT_LIST_HEAD(&task->list);
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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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init_timer(&task->timer);
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init_completion(&task->completion);
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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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void sas_free_task(struct sas_task *task)
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{
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if (task) {
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BUG_ON(!list_empty(&task->list));
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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 =
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container_of(work, struct sas_ha_event, work);
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struct sas_ha_struct *ha = ev->ha;
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sas_begin_event(HAE_RESET, &ha->event_lock,
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&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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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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if (sas_ha->lldd_queue_size == 0)
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sas_ha->lldd_queue_size = 1;
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else if (sas_ha->lldd_queue_size == -1)
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sas_ha->lldd_queue_size = 128; /* Sanity */
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sas_ha->state = SAS_HA_REGISTERED;
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spin_lock_init(&sas_ha->state_lock);
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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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if (sas_ha->lldd_max_execute_num > 1) {
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error = sas_init_queue(sas_ha);
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if (error) {
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printk(KERN_NOTICE "couldn't start queue thread:%d, "
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"running in direct mode\n", error);
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sas_ha->lldd_max_execute_num = 1;
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}
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}
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INIT_LIST_HEAD(&sas_ha->eh_done_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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int sas_unregister_ha(struct sas_ha_struct *sas_ha)
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{
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unsigned long flags;
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/* Set the state to unregistered to avoid further
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* events to be queued */
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spin_lock_irqsave(&sas_ha->state_lock, flags);
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sas_ha->state = SAS_HA_UNREGISTERED;
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spin_unlock_irqrestore(&sas_ha->state_lock, flags);
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scsi_flush_work(sas_ha->core.shost);
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sas_unregister_ports(sas_ha);
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if (sas_ha->lldd_max_execute_num > 1) {
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sas_shutdown_queue(sas_ha);
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sas_ha->lldd_max_execute_num = 1;
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}
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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_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 command;
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if (enable)
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command = PHY_FUNC_LINK_RESET;
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else
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command = 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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sas_phy_disconnected(asd_phy);
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sas_ha->notify_phy_event(asd_phy, PHYE_LOSS_OF_SIGNAL);
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}
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ret = i->dft->lldd_control_phy(asd_phy, command, 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, command, 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 (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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static struct sas_function_template sft = {
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.phy_enable = sas_phy_enable,
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.phy_reset = sas_phy_reset,
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.set_phy_speed = sas_set_phy_speed,
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.get_linkerrors = sas_get_linkerrors,
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.smp_handler = sas_smp_handler,
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};
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struct scsi_transport_template *
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sas_domain_attach_transport(struct sas_domain_function_template *dft)
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{
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struct scsi_transport_template *stt = sas_attach_transport(&sft);
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struct sas_internal *i;
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if (!stt)
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return stt;
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i = to_sas_internal(stt);
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i->dft = dft;
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stt->create_work_queue = 1;
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stt->eh_timed_out = sas_scsi_timed_out;
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stt->eh_strategy_handler = sas_scsi_recover_host;
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return stt;
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}
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EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
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void sas_domain_release_transport(struct scsi_transport_template *stt)
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{
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sas_release_transport(stt);
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}
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EXPORT_SYMBOL_GPL(sas_domain_release_transport);
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/* ---------- SAS Class register/unregister ---------- */
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static int __init sas_class_init(void)
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{
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sas_task_cache = KMEM_CACHE(sas_task, SLAB_HWCACHE_ALIGN);
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if (!sas_task_cache)
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return -ENOMEM;
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return 0;
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}
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static void __exit sas_class_exit(void)
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{
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kmem_cache_destroy(sas_task_cache);
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}
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MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
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MODULE_DESCRIPTION("SAS Transport Layer");
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MODULE_LICENSE("GPL v2");
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module_init(sas_class_init);
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module_exit(sas_class_exit);
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EXPORT_SYMBOL_GPL(sas_register_ha);
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EXPORT_SYMBOL_GPL(sas_unregister_ha);
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