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https://github.com/projectacrn/acrn-hypervisor.git
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4d88b2bb65
The sbuf is allocated for each pcpu by hypercall from SOS. Before launch Guest OS, the script will offline cpus, which will trigger vcpu reset and then reset sbuf pointer. But sbuf only initiate once by SOS, so these cpus for Guest OS has no sbuf to use. Thus, when run 'acrntrace' on SOS, there is no trace data for Guest OS. To fix the issue, only reset the sbuf for SOS. Tracked-On: #3335 Signed-off-by: Conghui Chen <conghui.chen@intel.com> Reviewed-by: Eddie Dong <eddie.dong@intel.com> Reviewed-by: Yan, Like <like.yan@intel.com>
72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
/*
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* SHARED BUFFER
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*
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* Copyright (C) 2017 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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* Li Fei <fei1.li@intel.com>
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*
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*/
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#ifndef SHARED_BUFFER_H
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#define SHARED_BUFFER_H
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#define SBUF_MAGIC 0x5aa57aa71aa13aa3UL
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#define SBUF_MAX_SIZE (1UL << 22U)
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#define SBUF_HEAD_SIZE 64U
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/* sbuf flags */
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#define OVERRUN_CNT_EN (1U << 0U) /* whether overrun counting is enabled */
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#define OVERWRITE_EN (1U << 1U) /* whether overwrite is enabled */
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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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* | struct shared_buf | raw data (ele_size)| ... | raw data (ele_size) |
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* ----------------------------------------------------------------------
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* |
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* |
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* struct shared_buf *buf
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*/
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enum {
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ACRN_TRACE = 0U,
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ACRN_HVLOG,
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ACRN_SEP,
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ACRN_SOCWATCH,
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ACRN_SBUF_ID_MAX,
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};
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/* Make sure sizeof(struct shared_buf) == SBUF_HEAD_SIZE */
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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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uint32_t flags;
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uint32_t reserved;
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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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};
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/**
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*@pre sbuf != NULL
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*@pre data != NULL
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*/
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uint32_t sbuf_put(struct shared_buf *sbuf, uint8_t *data);
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int32_t sbuf_share_setup(uint16_t pcpu_id, uint32_t sbuf_id, uint64_t *hva);
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void sbuf_reset(void);
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uint32_t sbuf_next_ptr(uint32_t pos, uint32_t span, uint32_t scope);
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#endif /* SHARED_BUFFER_H */
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