mirror of
https://github.com/Telecominfraproject/OpenCellular.git
synced 2026-01-01 21:02:27 +00:00
8c5fe0b5b9
This patch moves the bakery locks out of coherent memory to normal memory. This implies that the lock information needs to be placed on a separate cache line for each cpu. Hence the bakery_lock_info_t structure is allocated in the per-cpu data so as to minimize memory wastage. A similar platform per-cpu data is introduced for the platform locks. As a result of the above changes, the bakery lock api is completely changed. Earlier, a reference to the lock structure was passed to the lock implementation. Now a unique-id (essentially an index into the per-cpu data array) and an offset into the per-cpu data for bakery_info_t needs to be passed to the lock implementation. Change-Id: I1e76216277448713c6c98b4c2de4fb54198b39e0
74 lines
2.6 KiB
C
74 lines
2.6 KiB
C
/*
|
|
* Copyright (c) 2013-2014, ARM Limited and Contributors. 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.
|
|
*
|
|
* Neither the name of ARM nor the names of its contributors may be used
|
|
* to endorse or promote products derived from this software without specific
|
|
* prior written permission.
|
|
*
|
|
* 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 HOLDER 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.
|
|
*/
|
|
|
|
#ifndef __BAKERY_LOCK_H__
|
|
#define __BAKERY_LOCK_H__
|
|
|
|
#include <platform_def.h>
|
|
|
|
#define BAKERY_LOCK_MAX_CPUS PLATFORM_CORE_COUNT
|
|
|
|
#ifndef __ASSEMBLY__
|
|
#include <stdint.h>
|
|
|
|
#if USE_COHERENT_MEM
|
|
|
|
typedef struct bakery_lock {
|
|
int owner;
|
|
volatile char entering[BAKERY_LOCK_MAX_CPUS];
|
|
volatile unsigned number[BAKERY_LOCK_MAX_CPUS];
|
|
} bakery_lock_t;
|
|
|
|
#define NO_OWNER (-1)
|
|
|
|
void bakery_lock_init(bakery_lock_t *bakery);
|
|
void bakery_lock_get(bakery_lock_t *bakery);
|
|
void bakery_lock_release(bakery_lock_t *bakery);
|
|
int bakery_lock_try(bakery_lock_t *bakery);
|
|
|
|
#else
|
|
|
|
typedef struct bakery_info {
|
|
/*
|
|
* The lock_data is a bit-field of 2 members:
|
|
* Bit[0] : choosing. This field is set when the CPU is
|
|
* choosing its bakery number.
|
|
* Bits[1 - 15] : number. This is the bakery number allocated.
|
|
*/
|
|
volatile uint16_t lock_data;
|
|
} bakery_info_t;
|
|
|
|
void bakery_lock_get(unsigned int id, unsigned int offset);
|
|
void bakery_lock_release(unsigned int id, unsigned int offset);
|
|
|
|
#endif /* __USE_COHERENT_MEM__ */
|
|
#endif /* __ASSEMBLY__ */
|
|
#endif /* __BAKERY_LOCK_H__ */
|