mirror of
https://github.com/projectacrn/acrn-hypervisor.git
synced 2025-05-23 07:33:47 +00:00
a35a650f5f
Benefits of outputing trace data as raw data:
- Smaller trace data size
- More convenient to add new trace entry. There is no need to change acrntrace
when we add new trace entry to HV. All we need do is to update the analysis
scripts to deal with this situation.
Trace data size(with 1 UOS):
~57M -- with patch
~137M -- without patch
Signed-off-by: Kaige Fu <kaige.fu@intel.com>
Reviewed-by: Yan, Like <like.yan@intel.com>
Reviewed-by: Geoffroy Van Cutsem <geoffroy.vancutsem@intel.com>
72 lines
2.1 KiB
C
72 lines
2.1 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef SHARED_BUF_H
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#define SHARED_BUF_H
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#include <linux/types.h>
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#define SBUF_MAGIC 0x5aa57aa71aa13aa3
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#define SBUF_MAX_SIZE (1ULL << 22)
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#define SBUF_HEAD_SIZE 64
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/* sbuf flags */
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#define OVERRUN_CNT_EN (1ULL << 0) /* whether overrun counting is enabled */
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#define OVERWRITE_EN (1ULL << 1) /* whether overwrite is enabled */
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typedef unsigned char uint8_t;
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typedef unsigned int uint32_t;
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typedef unsigned long uint64_t;
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/**
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* (sbuf) head + buf (store (ele_num - 1) elements at most)
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* buffer empty: tail == head
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* buffer full: (tail + ele_size) % size == head
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*
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* Base of memory for elements
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* |
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* |
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* ---------------------------------------------------------------------------------------
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* | shared_buf_t | raw data (ele_size)| raw date (ele_size) | ... | raw data (ele_size) |
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* ---------------------------------------------------------------------------------------
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* |
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* |
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* shared_buf_t *buf
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*/
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/* Make sure sizeof(shared_buf_t) == SBUF_HEAD_SIZE */
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typedef struct shared_buf {
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uint64_t magic;
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uint32_t ele_num; /* number of elements */
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uint32_t ele_size; /* sizeof of elements */
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uint32_t head; /* offset from base, to read */
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uint32_t tail; /* offset from base, to write */
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uint64_t flags;
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uint32_t overrun_cnt; /* count of overrun */
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uint32_t size; /* ele_num * ele_size */
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uint32_t padding[6];
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} shared_buf_t;
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static inline void sbuf_clear_flags(shared_buf_t *sbuf, uint64_t flags)
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{
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sbuf->flags &= ~flags;
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}
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static inline void sbuf_set_flags(shared_buf_t *sbuf, uint64_t flags)
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{
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sbuf->flags = flags;
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}
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static inline void sbuf_add_flags(shared_buf_t *sbuf, uint64_t flags)
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{
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sbuf->flags |= flags;
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}
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int sbuf_get(shared_buf_t *sbuf, uint8_t *data);
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int sbuf_write(int fd, shared_buf_t *sbuf);
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int sbuf_clear_buffered(shared_buf_t *sbuf);
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#endif /* SHARED_BUF_H */
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