mirror of https://gitee.com/openkylin/linux.git
347 lines
8.9 KiB
C
347 lines
8.9 KiB
C
/*
|
|
* Serial Attached SCSI (SAS) Transport Layer initialization
|
|
*
|
|
* Copyright (C) 2005 Adaptec, Inc. All rights reserved.
|
|
* Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
|
|
*
|
|
* This file is licensed under GPLv2.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of the
|
|
* License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
|
|
* USA
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/init.h>
|
|
#include <linux/device.h>
|
|
#include <linux/spinlock.h>
|
|
#include <scsi/scsi_host.h>
|
|
#include <scsi/scsi_device.h>
|
|
#include <scsi/scsi_transport.h>
|
|
#include <scsi/scsi_transport_sas.h>
|
|
|
|
#include "sas_internal.h"
|
|
|
|
#include "../scsi_sas_internal.h"
|
|
|
|
static struct kmem_cache *sas_task_cache;
|
|
|
|
struct sas_task *sas_alloc_task(gfp_t flags)
|
|
{
|
|
struct sas_task *task = kmem_cache_zalloc(sas_task_cache, flags);
|
|
|
|
if (task) {
|
|
INIT_LIST_HEAD(&task->list);
|
|
spin_lock_init(&task->task_state_lock);
|
|
task->task_state_flags = SAS_TASK_STATE_PENDING;
|
|
init_timer(&task->timer);
|
|
init_completion(&task->completion);
|
|
}
|
|
|
|
return task;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sas_alloc_task);
|
|
|
|
void sas_free_task(struct sas_task *task)
|
|
{
|
|
if (task) {
|
|
BUG_ON(!list_empty(&task->list));
|
|
kmem_cache_free(sas_task_cache, task);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(sas_free_task);
|
|
|
|
/*------------ SAS addr hash -----------*/
|
|
void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
|
|
{
|
|
const u32 poly = 0x00DB2777;
|
|
u32 r = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
int b;
|
|
for (b = 7; b >= 0; b--) {
|
|
r <<= 1;
|
|
if ((1 << b) & sas_addr[i]) {
|
|
if (!(r & 0x01000000))
|
|
r ^= poly;
|
|
} else if (r & 0x01000000)
|
|
r ^= poly;
|
|
}
|
|
}
|
|
|
|
hashed[0] = (r >> 16) & 0xFF;
|
|
hashed[1] = (r >> 8) & 0xFF ;
|
|
hashed[2] = r & 0xFF;
|
|
}
|
|
|
|
|
|
/* ---------- HA events ---------- */
|
|
|
|
void sas_hae_reset(struct work_struct *work)
|
|
{
|
|
struct sas_ha_event *ev =
|
|
container_of(work, struct sas_ha_event, work);
|
|
struct sas_ha_struct *ha = ev->ha;
|
|
|
|
sas_begin_event(HAE_RESET, &ha->event_lock,
|
|
&ha->pending);
|
|
}
|
|
|
|
int sas_register_ha(struct sas_ha_struct *sas_ha)
|
|
{
|
|
int error = 0;
|
|
|
|
spin_lock_init(&sas_ha->phy_port_lock);
|
|
sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);
|
|
|
|
if (sas_ha->lldd_queue_size == 0)
|
|
sas_ha->lldd_queue_size = 1;
|
|
else if (sas_ha->lldd_queue_size == -1)
|
|
sas_ha->lldd_queue_size = 128; /* Sanity */
|
|
|
|
sas_ha->state = SAS_HA_REGISTERED;
|
|
spin_lock_init(&sas_ha->state_lock);
|
|
|
|
error = sas_register_phys(sas_ha);
|
|
if (error) {
|
|
printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
|
|
return error;
|
|
}
|
|
|
|
error = sas_register_ports(sas_ha);
|
|
if (error) {
|
|
printk(KERN_NOTICE "couldn't register sas ports:%d\n", error);
|
|
goto Undo_phys;
|
|
}
|
|
|
|
error = sas_init_events(sas_ha);
|
|
if (error) {
|
|
printk(KERN_NOTICE "couldn't start event thread:%d\n", error);
|
|
goto Undo_ports;
|
|
}
|
|
|
|
if (sas_ha->lldd_max_execute_num > 1) {
|
|
error = sas_init_queue(sas_ha);
|
|
if (error) {
|
|
printk(KERN_NOTICE "couldn't start queue thread:%d, "
|
|
"running in direct mode\n", error);
|
|
sas_ha->lldd_max_execute_num = 1;
|
|
}
|
|
}
|
|
|
|
INIT_LIST_HEAD(&sas_ha->eh_done_q);
|
|
|
|
return 0;
|
|
|
|
Undo_ports:
|
|
sas_unregister_ports(sas_ha);
|
|
Undo_phys:
|
|
|
|
return error;
|
|
}
|
|
|
|
int sas_unregister_ha(struct sas_ha_struct *sas_ha)
|
|
{
|
|
unsigned long flags;
|
|
|
|
/* Set the state to unregistered to avoid further
|
|
* events to be queued */
|
|
spin_lock_irqsave(&sas_ha->state_lock, flags);
|
|
sas_ha->state = SAS_HA_UNREGISTERED;
|
|
spin_unlock_irqrestore(&sas_ha->state_lock, flags);
|
|
scsi_flush_work(sas_ha->core.shost);
|
|
|
|
sas_unregister_ports(sas_ha);
|
|
|
|
if (sas_ha->lldd_max_execute_num > 1) {
|
|
sas_shutdown_queue(sas_ha);
|
|
sas_ha->lldd_max_execute_num = 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sas_get_linkerrors(struct sas_phy *phy)
|
|
{
|
|
if (scsi_is_sas_phy_local(phy)) {
|
|
struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
|
|
struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
|
|
struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
|
|
struct sas_internal *i =
|
|
to_sas_internal(sas_ha->core.shost->transportt);
|
|
|
|
return i->dft->lldd_control_phy(asd_phy, PHY_FUNC_GET_EVENTS, NULL);
|
|
}
|
|
|
|
return sas_smp_get_phy_events(phy);
|
|
}
|
|
|
|
int sas_phy_enable(struct sas_phy *phy, int enable)
|
|
{
|
|
int ret;
|
|
enum phy_func command;
|
|
|
|
if (enable)
|
|
command = PHY_FUNC_LINK_RESET;
|
|
else
|
|
command = PHY_FUNC_DISABLE;
|
|
|
|
if (scsi_is_sas_phy_local(phy)) {
|
|
struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
|
|
struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
|
|
struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
|
|
struct sas_internal *i =
|
|
to_sas_internal(sas_ha->core.shost->transportt);
|
|
|
|
if (!enable) {
|
|
sas_phy_disconnected(asd_phy);
|
|
sas_ha->notify_phy_event(asd_phy, PHYE_LOSS_OF_SIGNAL);
|
|
}
|
|
ret = i->dft->lldd_control_phy(asd_phy, command, NULL);
|
|
} else {
|
|
struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
|
|
struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
|
|
ret = sas_smp_phy_control(ddev, phy->number, command, NULL);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int sas_phy_reset(struct sas_phy *phy, int hard_reset)
|
|
{
|
|
int ret;
|
|
enum phy_func reset_type;
|
|
|
|
if (hard_reset)
|
|
reset_type = PHY_FUNC_HARD_RESET;
|
|
else
|
|
reset_type = PHY_FUNC_LINK_RESET;
|
|
|
|
if (scsi_is_sas_phy_local(phy)) {
|
|
struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
|
|
struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
|
|
struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
|
|
struct sas_internal *i =
|
|
to_sas_internal(sas_ha->core.shost->transportt);
|
|
|
|
ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
|
|
} else {
|
|
struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
|
|
struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
|
|
ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int sas_set_phy_speed(struct sas_phy *phy,
|
|
struct sas_phy_linkrates *rates)
|
|
{
|
|
int ret;
|
|
|
|
if ((rates->minimum_linkrate &&
|
|
rates->minimum_linkrate > phy->maximum_linkrate) ||
|
|
(rates->maximum_linkrate &&
|
|
rates->maximum_linkrate < phy->minimum_linkrate))
|
|
return -EINVAL;
|
|
|
|
if (rates->minimum_linkrate &&
|
|
rates->minimum_linkrate < phy->minimum_linkrate_hw)
|
|
rates->minimum_linkrate = phy->minimum_linkrate_hw;
|
|
|
|
if (rates->maximum_linkrate &&
|
|
rates->maximum_linkrate > phy->maximum_linkrate_hw)
|
|
rates->maximum_linkrate = phy->maximum_linkrate_hw;
|
|
|
|
if (scsi_is_sas_phy_local(phy)) {
|
|
struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
|
|
struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
|
|
struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
|
|
struct sas_internal *i =
|
|
to_sas_internal(sas_ha->core.shost->transportt);
|
|
|
|
ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
|
|
rates);
|
|
} else {
|
|
struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
|
|
struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
|
|
ret = sas_smp_phy_control(ddev, phy->number,
|
|
PHY_FUNC_LINK_RESET, rates);
|
|
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct sas_function_template sft = {
|
|
.phy_enable = sas_phy_enable,
|
|
.phy_reset = sas_phy_reset,
|
|
.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);
|