+++ /dev/null
-/* SPDX-License-Identifier: (GPL-2.0-only OR LGPL-2.1-only)
- *
- * lib/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 lib_ring_buffer_backend_page {
- void *virt; /* page virtual address (cached) */
- unsigned long pfn; /* page frame number */
-};
-
-struct lib_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 lib_ring_buffer_backend_page p[];
-};
-
-struct lib_ring_buffer_backend_subbuffer {
- /* Identifier for subbuf backend pages. Exchanged atomically. */
- unsigned long id; /* backend subbuffer identifier */
-};
-
-struct lib_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 channel;
-struct lib_ring_buffer;
-
-struct lib_ring_buffer_backend {
- /* Array of ring_buffer_backend_subbuffer for writer */
- struct lib_ring_buffer_backend_subbuffer *buf_wsb;
- /* ring_buffer_backend_subbuffer for reader */
- struct lib_ring_buffer_backend_subbuffer buf_rsb;
- /* Array of lib_ring_buffer_backend_counts for the packet counter */
- struct lib_ring_buffer_backend_counts *buf_cnt;
- /*
- * Pointer array of backend pages, for whole buffer.
- * Indexed by ring_buffer_backend_subbuffer identifier (id) index.
- */
- struct lib_ring_buffer_backend_pages **array;
- unsigned int num_pages_per_subbuf;
-
- struct 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 ? */
- struct lib_ring_buffer *buf; /* Channel per-cpu buffers */
-
- unsigned long num_subbuf; /* Number of sub-buffers for writer */
- u64 start_tsc; /* Channel creation TSC value */
- void *priv; /* Client-specific information */
- void *priv_ops; /* Client-specific ops pointer */
- void (*release_priv_ops)(void *priv_ops);
-#if (LINUX_VERSION_CODE >= 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 lib_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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