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/* SPDX-License-Identifier: (GPL-2.0-only OR LGPL-2.1-only)
*
* ringbuffer/backend_types.h
*
* Ring buffer backend (types).
*
* Copyright (C) 2008-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*/
#ifndef _LIB_RING_BUFFER_BACKEND_TYPES_H
#define _LIB_RING_BUFFER_BACKEND_TYPES_H
#include <linux/cpumask.h>
#include <linux/types.h>
#include <lttng/kernel-version.h>
#include <lttng/cpuhotplug.h>
struct lttng_kernel_ring_buffer_backend_page {
void *virt; /* page virtual address (cached) */
unsigned long pfn; /* page frame number */
};
struct lttng_kernel_ring_buffer_backend_pages {
unsigned long mmap_offset; /* offset of the subbuffer in mmap */
union v_atomic records_commit; /* current records committed count */
union v_atomic records_unread; /* records to read */
unsigned long data_size; /* Amount of data to read from subbuf */
struct lttng_kernel_ring_buffer_backend_page p[];
};
struct lttng_kernel_ring_buffer_backend_subbuffer {
/* Identifier for subbuf backend pages. Exchanged atomically. */
unsigned long id; /* backend subbuffer identifier */
};
struct lttng_kernel_ring_buffer_backend_counts {
/*
* Counter specific to the sub-buffer location within the ring buffer.
* The actual sequence number of the packet within the entire ring
* buffer can be derived from the formula nr_subbuffers * seq_cnt +
* subbuf_idx.
*/
uint64_t seq_cnt; /* packet sequence number */
};
/*
* Forward declaration of frontend-specific channel and ring_buffer.
*/
struct lttng_kernel_ring_buffer_channel;
struct lttng_kernel_ring_buffer;
struct lttng_kernel_ring_buffer_backend {
/* Array of ring_buffer_backend_subbuffer for writer */
struct lttng_kernel_ring_buffer_backend_subbuffer *buf_wsb;
/* ring_buffer_backend_subbuffer for reader */
struct lttng_kernel_ring_buffer_backend_subbuffer buf_rsb;
/* Array of lib_ring_buffer_backend_counts for the packet counter */
struct lttng_kernel_ring_buffer_backend_counts *buf_cnt;
/*
* Pointer array of backend pages, for whole buffer.
* Indexed by ring_buffer_backend_subbuffer identifier (id) index.
*/
struct lttng_kernel_ring_buffer_backend_pages **array;
unsigned int num_pages_per_subbuf;
struct lttng_kernel_ring_buffer_channel *chan; /* Associated channel */
int cpu; /* This buffer's cpu. -1 if global. */
union v_atomic records_read; /* Number of records read */
unsigned int allocated:1; /* is buffer allocated ? */
};
struct channel_backend {
unsigned long buf_size; /* Size of the buffer */
unsigned long subbuf_size; /* Sub-buffer size */
unsigned int subbuf_size_order; /* Order of sub-buffer size */
unsigned int num_subbuf_order; /*
* Order of number of sub-buffers/buffer
* for writer.
*/
unsigned int buf_size_order; /* Order of buffer size */
unsigned int extra_reader_sb:1; /* has extra reader subbuffer ? */
union {
struct lttng_kernel_ring_buffer *global_buf; /* Channel global buffer */
struct lttng_kernel_ring_buffer __percpu *percpu_buf; /* Channel per-cpu buffers */
};
unsigned long num_subbuf; /* Number of sub-buffers for writer */
u64 start_timestamp; /* Channel creation timestamp value */
void *priv; /* Client-specific information */
void *priv_ops; /* Client-specific ops pointer */
void (*release_priv_ops)(void *priv_ops);
#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
struct lttng_cpuhp_node cpuhp_prepare; /* CPU hotplug prepare */
#else
struct notifier_block cpu_hp_notifier; /* CPU hotplug notifier */
#endif
/*
* We need to copy config because the module containing the
* source config can vanish before the last reference to this
* channel's streams is released.
*/
struct lttng_kernel_ring_buffer_config config; /* Ring buffer configuration */
cpumask_var_t cpumask; /* Allocated per-cpu buffers cpumask */
char name[NAME_MAX]; /* Channel name */
};
#endif /* _LIB_RING_BUFFER_BACKEND_TYPES_H */
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