65 lines
2.2 KiB
C
65 lines
2.2 KiB
C
/*
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* Linux内核诊断工具--工具通用调试缓冲区模块
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* 这是为了解决procfs/trace的问题而编写
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*
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* Copyright (C) 2020 Alibaba Ltd.
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*
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* 作者： Baoyou Xie <baoyou.xie@linux.alibaba.com>
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*
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* License terms: GNU General Public License (GPL) version 3
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*/
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#include <linux/mutex.h>
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#include <linux/spinlock.h>
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#include <linux/stddef.h>
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#define DIAG_VARIANT_BUFFER_HEAD_MAGIC_SEALED 197612031122
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#define DIAG_VARIANT_BUFFER_HEAD_MAGIC_UNSEALED 197612031234
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struct diag_variant_buffer_head {
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unsigned long magic;
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unsigned long len;
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};
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struct diag_variant_buffer {
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struct {
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char *data;
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unsigned int pos;
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struct diag_variant_buffer_head *head;
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} buffers[2];
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/* 0 or 1 */
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int buffer_toggle;
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struct {
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char *data;
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unsigned int len;
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} product;
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unsigned int buf_size;
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unsigned int alloced;
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spinlock_t lock;
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struct mutex mutex;
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};
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#define diag_variant_buffer_spin_lock(__buffer, flags) \
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spin_lock_irqsave(&((__buffer)->lock), flags)
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#define diag_variant_buffer_spin_unlock(__buffer, flags) \
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spin_unlock_irqrestore(&((__buffer)->lock), flags)
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int init_diag_variant_buffer(struct diag_variant_buffer *buffer,
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unsigned int buf_size);
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int alloc_diag_variant_buffer(struct diag_variant_buffer *buffer);
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void destroy_diag_variant_buffer(struct diag_variant_buffer *buffer);
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void discard_diag_variant_buffer(struct diag_variant_buffer *buffer);
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void backup_diag_variant_buffer(struct diag_variant_buffer *buffer);
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asmlinkage int diag_variant_buffer_reserve(struct diag_variant_buffer *buffer,
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size_t len);
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asmlinkage int diag_variant_buffer_seal(struct diag_variant_buffer *buffer);
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asmlinkage int
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diag_variant_buffer_write_nolock(struct diag_variant_buffer *buffer,
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const void *data, size_t len);
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void diag_variant_buffer_mutex_lock(struct diag_variant_buffer *buffer);
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void diag_variant_buffer_mutex_unlock(struct diag_variant_buffer *buffer);
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int copy_to_user_variant_buffer(struct diag_variant_buffer *variant_buffer,
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void __user *ptr_len, void __user *buf,
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size_t size);
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