Move to kernel style SPDX license identifiers

[lttng-ust.git] / libringbuffer / backend_types.h

diff --git a/libringbuffer/backend_types.h b/libringbuffer/backend_types.h
index 1d301de2e178f8bc992ceb842ff8a4522f359618..f821c27fdd0684695866148da84a6e1fd8599e62 100644 (file)
--- a/libringbuffer/backend_types.h
+++ b/libringbuffer/backend_types.h
@@ -1,61 +1,81 @@
-#ifndef _LINUX_RING_BUFFER_BACKEND_TYPES_H
-#define _LINUX_RING_BUFFER_BACKEND_TYPES_H
-
 /*
- * linux/ringbuffer/backend_types.h
+ * SPDX-License-Identifier: LGPL-2.1-only
  *
- * Copyright (C) 2008-2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (C) 2008-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  *
  * Ring buffer backend (types).
- *
- * Dual LGPL v2.1/GPL v2 license.
  */
 
-#include <linux/cpumask.h>
-#include <linux/types.h>
+#ifndef _LTTNG_RING_BUFFER_BACKEND_TYPES_H
+#define _LTTNG_RING_BUFFER_BACKEND_TYPES_H
 
-struct lib_ring_buffer_backend_page {
-       void *virt;                     /* page virtual address (cached) */
-       struct page *page;              /* pointer to page structure */
-};
+#include <limits.h>
+#include <stdint.h>
+#include "shm_internal.h"
+#include "vatomic.h"
 
-struct lib_ring_buffer_backend_pages {
+#define RB_BACKEND_PAGES_PADDING       16
+struct lttng_ust_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[];
+       DECLARE_SHMP(char, p);          /* Backing memory map */
+       char padding[RB_BACKEND_PAGES_PADDING];
 };
 
-struct lib_ring_buffer_backend_subbuffer {
+struct lttng_ust_lib_ring_buffer_backend_subbuffer {
        /* Identifier for subbuf backend pages. Exchanged atomically. */
        unsigned long id;               /* backend subbuffer identifier */
 };
 
+struct lttng_ust_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 lttng_ust_lib_ring_buffer;
+
+struct lttng_ust_lib_ring_buffer_backend_pages_shmp {
+       DECLARE_SHMP(struct lttng_ust_lib_ring_buffer_backend_pages, shmp);
+};
 
-struct lib_ring_buffer_backend {
+#define RB_BACKEND_RING_BUFFER_PADDING         64
+struct lttng_ust_lib_ring_buffer_backend {
        /* Array of ring_buffer_backend_subbuffer for writer */
-       struct lib_ring_buffer_backend_subbuffer *buf_wsb;
+       DECLARE_SHMP(struct lttng_ust_lib_ring_buffer_backend_subbuffer, buf_wsb);
        /* ring_buffer_backend_subbuffer for reader */
-       struct lib_ring_buffer_backend_subbuffer buf_rsb;
+       struct lttng_ust_lib_ring_buffer_backend_subbuffer buf_rsb;
+       /* Array of lib_ring_buffer_backend_counts for the packet counter */
+       DECLARE_SHMP(struct lttng_ust_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;
+       DECLARE_SHMP(struct lttng_ust_lib_ring_buffer_backend_pages_shmp, array);
+       DECLARE_SHMP(char, memory_map); /* memory mapping */
 
-       struct channel *chan;           /* Associated channel */
+       DECLARE_SHMP(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;       /* Bool: is buffer allocated ? */
+       unsigned int allocated:1;       /* is buffer allocated ? */
+       char padding[RB_BACKEND_RING_BUFFER_PADDING];
 };
 
+struct lttng_ust_lib_ring_buffer_shmp {
+       DECLARE_SHMP(struct lttng_ust_lib_ring_buffer, shmp); /* Channel per-cpu buffers */
+};
+
+#define RB_BACKEND_CHANNEL_PADDING     64
 struct channel_backend {
        unsigned long buf_size;         /* Size of the buffer */
        unsigned long subbuf_size;      /* Sub-buffer size */
@@ -65,16 +85,14 @@ struct channel_backend {
                                         * for writer.
                                         */
        unsigned int buf_size_order;    /* Order of buffer size */
-       int extra_reader_sb:1;          /* Bool: has extra reader subbuffer */
-       struct lib_ring_buffer *buf;    /* Channel per-cpu buffers */
-
+       unsigned int extra_reader_sb:1; /* has extra reader subbuffer ? */
        unsigned long num_subbuf;       /* Number of sub-buffers for writer */
-       u64 start_tsc;                  /* Channel creation TSC value */
-       void *priv;                     /* Client-specific information */
-       struct notifier_block cpu_hp_notifier;   /* CPU hotplug notifier */
-       const struct lib_ring_buffer_config *config; /* Ring buffer configuration */
-       cpumask_var_t cpumask;          /* Allocated per-cpu buffers cpumask */
+       uint64_t start_tsc;             /* Channel creation TSC value */
+       DECLARE_SHMP(void *, priv_data);/* Client-specific information */
+       struct lttng_ust_lib_ring_buffer_config config; /* Ring buffer configuration */
        char name[NAME_MAX];            /* Channel name */
+       char padding[RB_BACKEND_CHANNEL_PADDING];
+       struct lttng_ust_lib_ring_buffer_shmp buf[];
 };
 
-#endif /* _LINUX_RING_BUFFER_BACKEND_TYPES_H */
+#endif /* _LTTNG_RING_BUFFER_BACKEND_TYPES_H */