freebsd-dev/sys/dev/isci/scil/sci_base_subject.c
Jim Harris f11c7f6305 Add isci(4) driver for amd64 and i386 targets.
The isci driver is for the integrated SAS controller in the Intel C600
(Patsburg) chipset.  Source files in sys/dev/isci directory are
FreeBSD-specific, and sys/dev/isci/scil subdirectory contains
an OS-agnostic library (SCIL) published by Intel to control the SAS
controller.  This library is used primarily as-is in this driver, with
some post-processing to better integrate into the kernel build
environment.

isci.4 and a README in the sys/dev/isci directory contain a few
additional details.

This driver is only built for amd64 and i386 targets.

Sponsored by: Intel
Reviewed by: scottl
Approved by: scottl
2012-01-31 19:38:18 +00:00

150 lines
4.9 KiB
C

/*-
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* 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., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
* The full GNU General Public License is included in this distribution
* in the file called LICENSE.GPL.
*
* BSD LICENSE
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/**
* @file
*
* @brief This file contains the base subject method implementations and
* any constants or structures private to the base subject object.
* A subject is a participant in the observer design pattern. A
* subject represents the object being observed.
*/
#include <dev/isci/scil/sci_types.h>
#include <dev/isci/scil/sci_base_subject.h>
#include <dev/isci/scil/sci_base_observer.h>
#if defined(SCI_LOGGING)
//******************************************************************************
//* P R O T E C T E D M E T H O D S
//******************************************************************************
void sci_base_subject_construct(
SCI_BASE_SUBJECT_T *this_subject
)
{
this_subject->observer_list = NULL;
}
// ---------------------------------------------------------------------------
void sci_base_subject_notify(
SCI_BASE_SUBJECT_T *this_subject
)
{
SCI_BASE_OBSERVER_T *this_observer = this_subject->observer_list;
while (this_observer != NULL)
{
sci_base_observer_update(this_observer, this_subject);
this_observer = this_observer->next;
}
}
// ---------------------------------------------------------------------------
void sci_base_subject_attach_observer(
SCI_BASE_SUBJECT_T *this_subject,
SCI_BASE_OBSERVER_T *observer
)
{
observer->next = this_subject->observer_list;
this_subject->observer_list = observer;
}
// ---------------------------------------------------------------------------
void sci_base_subject_detach_observer(
SCI_BASE_SUBJECT_T *this_subject,
SCI_BASE_OBSERVER_T *observer
)
{
SCI_BASE_OBSERVER_T *current_observer = this_subject->observer_list;
SCI_BASE_OBSERVER_T *previous_observer = NULL;
// Search list for the item to remove
while (
current_observer != NULL
&& current_observer != observer
)
{
previous_observer = current_observer;
current_observer = current_observer->next;
}
// Was this observer in the list?
if (current_observer == observer)
{
if (previous_observer != NULL)
{
// Remove from middle or end of list
previous_observer->next = observer->next;
}
else
{
// Remove from the front of the list
this_subject->observer_list = observer->next;
}
// protect the list so people dont follow bad pointers
observer->next = NULL;
}
}
#endif // defined(SCI_LOGGING)