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https://github.com/ARM-software/arm-trusted-firmware.git
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548579f56e
This patch removes the `owner` field in bakery_lock_t structure which is the data structure used in the bakery lock implementation that uses coherent memory. The assertions to protect against recursive lock acquisition were based on the 'owner' field. They are now done based on the bakery lock ticket number. These assertions are also added to the bakery lock implementation that uses normal memory as well. Change-Id: If4850a00dffd3977e218c0f0a8d145808f36b470
92 lines
3.5 KiB
C
92 lines
3.5 KiB
C
/*
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* Copyright (c) 2013-2015, ARM Limited and Contributors. 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 are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __BAKERY_LOCK_H__
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#define __BAKERY_LOCK_H__
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#include <platform_def.h>
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#define BAKERY_LOCK_MAX_CPUS PLATFORM_CORE_COUNT
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#ifndef __ASSEMBLY__
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#include <stdint.h>
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/*****************************************************************************
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* Internal helper macros used by the bakery lock implementation.
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****************************************************************************/
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/* Convert a ticket to priority */
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#define PRIORITY(t, pos) (((t) << 8) | (pos))
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#define CHOOSING_TICKET 0x1
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#define CHOSEN_TICKET 0x0
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#define bakery_is_choosing(info) (info & 0x1)
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#define bakery_ticket_number(info) ((info >> 1) & 0x7FFF)
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#define make_bakery_data(choosing, number) \
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(((choosing & 0x1) | (number << 1)) & 0xFFFF)
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/*****************************************************************************
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* External bakery lock interface.
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****************************************************************************/
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#if USE_COHERENT_MEM
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typedef struct bakery_lock {
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/*
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* The lock_data is a bit-field of 2 members:
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* Bit[0] : choosing. This field is set when the CPU is
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* choosing its bakery number.
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* Bits[1 - 15] : number. This is the bakery number allocated.
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*/
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volatile uint16_t lock_data[BAKERY_LOCK_MAX_CPUS];
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} bakery_lock_t;
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void bakery_lock_init(bakery_lock_t *bakery);
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void bakery_lock_get(bakery_lock_t *bakery);
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void bakery_lock_release(bakery_lock_t *bakery);
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int bakery_lock_try(bakery_lock_t *bakery);
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#else
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typedef struct bakery_info {
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/*
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* The lock_data is a bit-field of 2 members:
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* Bit[0] : choosing. This field is set when the CPU is
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* choosing its bakery number.
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* Bits[1 - 15] : number. This is the bakery number allocated.
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*/
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volatile uint16_t lock_data;
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} bakery_info_t;
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void bakery_lock_get(unsigned int id, unsigned int offset);
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void bakery_lock_release(unsigned int id, unsigned int offset);
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#endif /* __USE_COHERENT_MEM__ */
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#endif /* __ASSEMBLY__ */
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#endif /* __BAKERY_LOCK_H__ */
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