forked from Mirrors/opensbi
9dc95021db
This patch does following improvements to sbi_fifo: 1. Use valid SBI_Exxxx error codes instead of -1 2. The sbi_fifo_is_full() and sbi_fifo_is_empty() did not acquire qlock before accessing head and tail hence fixed it 3. Added avail member for ease in debugging and simplifying head/tail updates. Due to above changes size of sbi_fifo changes from 48 bytes to 56 bytes. Signed-off-by: Anup Patel <anup.patel@wdc.com>
37 lines
867 B
C
37 lines
867 B
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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/* Static members of struct */
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void *queue;
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unsigned long entry_size;
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unsigned long num_entries;
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/* Dynamic members of struct protected by lock */
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spinlock_t qlock;
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unsigned long avail;
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unsigned long head;
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unsigned long tail;
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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);
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void sbi_fifo_init(struct sbi_fifo *fifo, void *queue_mem,
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unsigned long entries, unsigned long entry_size);
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bool sbi_fifo_is_empty(struct sbi_fifo *fifo);
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bool sbi_fifo_is_full(struct sbi_fifo *fifo);
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#endif
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