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https://github.com/riscv-software-src/opensbi.git
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d35c76a766
The FIFO data structure is quite handy of variety of use-case so add SBI_FIFO_INITIALIZER() and SBI_FIFO_DEFINE() helper macros to create FIFO as local or global variable. Signed-off-by: Anup Patel <apatel@ventanamicro.com> Reviewed-By: Himanshu Chauhan <hchauhan@ventanamicro.com>
55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Atish Patra<atish.patra@wdc.com>
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*
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*/
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#ifndef __SBI_FIFO_H__
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#define __SBI_FIFO_H__
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#include <sbi/riscv_locks.h>
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#include <sbi/sbi_types.h>
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struct sbi_fifo {
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void *queue;
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spinlock_t qlock;
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u16 entry_size;
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u16 num_entries;
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u16 avail;
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u16 tail;
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};
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#define SBI_FIFO_INITIALIZER(__queue_mem, __entries, __entry_size) \
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{ .queue = __queue_mem, \
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.qlock = SPIN_LOCK_INITIALIZER, \
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.num_entries = __entries, \
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.entry_size = __entry_size, \
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.avail = 0, \
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.tail = 0, \
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}
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#define SBI_FIFO_DEFINE(__name, __queue_mem, __entries, __entry_size) \
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struct sbi_fifo __name = SBI_FIFO_INITIALIZER(__queue_mem, __entries, __entry_size)
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enum sbi_fifo_inplace_update_types {
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SBI_FIFO_SKIP,
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SBI_FIFO_UPDATED,
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SBI_FIFO_UNCHANGED,
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};
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int sbi_fifo_dequeue(struct sbi_fifo *fifo, void *data);
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int sbi_fifo_enqueue(struct sbi_fifo *fifo, void *data, bool force);
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void sbi_fifo_init(struct sbi_fifo *fifo, void *queue_mem, u16 entries,
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u16 entry_size);
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int sbi_fifo_is_empty(struct sbi_fifo *fifo);
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int sbi_fifo_is_full(struct sbi_fifo *fifo);
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int sbi_fifo_inplace_update(struct sbi_fifo *fifo, void *in,
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int (*fptr)(void *in, void *data));
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u16 sbi_fifo_avail(struct sbi_fifo *fifo);
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#endif
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