246 lines
8.2 KiB
C
246 lines
8.2 KiB
C
/*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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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., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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* The full GNU General Public License is included in this distribution
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* in the file called LICENSE.GPL.
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*
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* BSD LICENSE
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*
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* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "isci.h"
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#include "timers.h"
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#include "host.h"
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/**
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* isci_timer_list_construct() - This method contrucst the SCI Timer List
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* object used by the SCI Module class. The construction process involves
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* creating isci_timer objects and adding them to the SCI Timer List
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* object's list member. The number of isci_timer objects is determined by
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* the timer_list_size parameter.
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* @ihost: container of the timer list
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*
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* This method returns an error code indicating sucess or failure. The user
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* should check for possible memory allocation error return otherwise, a zero
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* indicates success.
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*/
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int isci_timer_list_construct(struct isci_host *ihost)
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{
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struct isci_timer *itimer;
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int i, err = 0;
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INIT_LIST_HEAD(&ihost->timers);
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for (i = 0; i < SCI_MAX_TIMER_COUNT; i++) {
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itimer = devm_kzalloc(&ihost->pdev->dev, sizeof(*itimer), GFP_KERNEL);
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if (!itimer) {
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err = -ENOMEM;
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break;
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}
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init_timer(&itimer->timer);
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itimer->used = 0;
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itimer->stopped = 1;
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list_add(&itimer->node, &ihost->timers);
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}
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return err;
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}
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/**
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* isci_timer_list_destroy() - This method destroys the SCI Timer List object
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* used by the SCI Module class. The destruction process involves freeing
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* memory allocated for isci_timer objects on the SCI Timer List object's
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* timers list_head member. If any isci_timer objects are mark as "in use",
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* they are not freed and the function returns an error code of -EBUSY.
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* @ihost: container of the list to be destroyed
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*/
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void isci_timer_list_destroy(struct isci_host *ihost)
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{
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struct isci_timer *timer;
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LIST_HEAD(list);
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spin_lock_irq(&ihost->scic_lock);
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list_splice_init(&ihost->timers, &list);
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spin_unlock_irq(&ihost->scic_lock);
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list_for_each_entry(timer, &list, node)
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del_timer_sync(&timer->timer);
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}
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/**
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* This method pulls an isci_timer object off of the list for the SCI Timer
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* List object specified, marks the isci_timer as "in use" and initializes
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* it with user callback function and cookie data. The timer is not start at
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* this time, just reserved for the user.
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* @isci_timer_list: This parameter points to the SCI Timer List from which the
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* timer is reserved.
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* @cookie: This parameter specifies a piece of information that the user must
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* retain. This cookie is to be supplied by the user anytime a timeout
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* occurs for the created timer.
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* @timer_callback: This parameter specifies the callback method to be invoked
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* whenever the timer expires.
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*
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* This method returns a pointer to an isci_timer object reserved from the SCI
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* Timer List. The pointer will be utilized for all further interactions
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* relating to this timer.
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*/
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static void timer_function(unsigned long data)
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{
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struct isci_timer *timer = (struct isci_timer *)data;
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struct isci_host *isci_host = timer->isci_host;
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unsigned long flags;
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dev_dbg(&isci_host->pdev->dev,
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"%s: isci_timer = %p\n", __func__, timer);
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if (isci_stopped == isci_host_get_state(isci_host)) {
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timer->stopped = 1;
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return;
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}
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spin_lock_irqsave(&isci_host->scic_lock, flags);
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if (!timer->stopped) {
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timer->stopped = 1;
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timer->timer_callback(timer->cb_param);
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}
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spin_unlock_irqrestore(&isci_host->scic_lock, flags);
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}
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struct isci_timer *isci_timer_create(struct isci_host *ihost, void *cb_param,
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void (*timer_callback)(void *))
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{
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struct timer_list *timer;
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struct isci_timer *isci_timer;
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struct list_head *list = &ihost->timers;
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WARN_ONCE(!spin_is_locked(&ihost->scic_lock),
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"%s: unlocked!\n", __func__);
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if (WARN_ONCE(list_empty(list), "%s: timer pool empty\n", __func__))
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return NULL;
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isci_timer = list_entry(list->next, struct isci_timer, node);
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isci_timer->used = 1;
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isci_timer->stopped = 1;
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/* FIXME: what!? we recycle the timer, rather than take it off
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* the free list?
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*/
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list_move_tail(&isci_timer->node, list);
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timer = &isci_timer->timer;
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timer->data = (unsigned long)isci_timer;
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timer->function = timer_function;
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isci_timer->cb_param = cb_param;
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isci_timer->timer_callback = timer_callback;
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isci_timer->isci_host = ihost;
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dev_dbg(&ihost->pdev->dev,
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"%s: isci_timer = %p\n", __func__, isci_timer);
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return isci_timer;
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}
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/* isci_del_timer() - This method frees the isci_timer, marking it "free to
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* use", then places its back at the head of the timers list for the SCI
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* Timer List object specified.
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*/
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void isci_del_timer(struct isci_host *ihost, struct isci_timer *isci_timer)
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{
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struct list_head *list = &ihost->timers;
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WARN_ONCE(!spin_is_locked(&ihost->scic_lock),
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"%s unlocked!\n", __func__);
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dev_dbg(&isci_timer->isci_host->pdev->dev,
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"%s: isci_timer = %p\n", __func__, isci_timer);
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isci_timer->used = 0;
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list_move(&isci_timer->node, list);
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del_timer(&isci_timer->timer);
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isci_timer->stopped = 1;
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}
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/**
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* isci_timer_start() - This method starts the specified isci_timer, with the
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* specified timeout value.
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* @isci_timer: This parameter specifies the timer to be started.
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* @timeout: This parameter specifies the timeout, in milliseconds, after which
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* the associated callback function will be called.
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*
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*/
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void isci_timer_start(struct isci_timer *isci_timer, unsigned long tmo)
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{
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struct timer_list *timer = &isci_timer->timer;
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dev_dbg(&isci_timer->isci_host->pdev->dev,
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"%s: isci_timer = %p\n", __func__, isci_timer);
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isci_timer->stopped = 0;
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mod_timer(timer, jiffies + msecs_to_jiffies(tmo));
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}
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/**
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* isci_timer_stop() - This method stops the supplied isci_timer.
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* @isci_timer: This parameter specifies the isci_timer to be stopped.
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*
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*/
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void isci_timer_stop(struct isci_timer *isci_timer)
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{
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dev_dbg(&isci_timer->isci_host->pdev->dev,
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"%s: isci_timer = %p\n", __func__, isci_timer);
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isci_timer->stopped = 1;
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del_timer(&isci_timer->timer);
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}
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