X-Git-Url: http://git.liburcu.org/?p=lttng-modules.git;a=blobdiff_plain;f=include%2Fringbuffer%2Fbackend_types.h;h=f1b3ee27759f76576b2b425af7ae02a52148098f;hp=ff237c03393237c32fb8df21cd9e0534c1603cfa;hb=b53047135828b997a4eeb2cae7344cb169aa9c8c;hpb=369708f464bedc0682151df9308cebfa14dbdb2b

diff --git a/include/ringbuffer/backend_types.h b/include/ringbuffer/backend_types.h
index ff237c03..f1b3ee27 100644
--- a/include/ringbuffer/backend_types.h
+++ b/include/ringbuffer/backend_types.h
@@ -1,2 +1,100 @@
-/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) */
-#include <lib/ringbuffer/backend_types.h>
+/* 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/lttng-kernel-version.h>
+#include <lttng/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);
+	struct lttng_cpuhp_node cpuhp_prepare;	/* CPU hotplug prepare */
+	/*
+	 * 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 */