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1718b1642e
As other exported fifo functions, we should check whether the fifo is valid in sbi_fifo_is_empty and sbi_fifo_is_full. To this end, this patch changes the retval from bool to int, and the two functions will return SBI_EINVAL in the case the fifo is invalid. Signed-off-by: Dong Du <Dd_nirvana@sjtu.edu.cn> Reviewed-by: Atish Patra <atish.patra@wdc.com>
42 lines
945 B
C
42 lines
945 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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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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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);
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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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