Per-stream ioctl to get the current timestamp

[lttng-modules.git] / lttng-ring-buffer-client.h

diff --git a/lttng-ring-buffer-client.h b/lttng-ring-buffer-client.h
index cf42e688eccf5364e4874fd3ab0f24d4634b6240..50c47b3bf49f6c2dd24e250cf1a9b97808cd8e27 100644 (file)
--- a/lttng-ring-buffer-client.h
+++ b/lttng-ring-buffer-client.h
@@ -60,13 +60,13 @@ struct packet_header {
                /* Stream packet context */
                uint64_t timestamp_begin;       /* Cycle count at subbuffer start */
                uint64_t timestamp_end;         /* Cycle count at subbuffer end */
-               uint32_t events_discarded;      /*
+               uint64_t content_size;          /* Size of data in subbuffer */
+               uint64_t packet_size;           /* Subbuffer size (include padding) */
+               unsigned long events_discarded; /*
                                                 * Events lost in this subbuffer since
                                                 * the beginning of the trace.
                                                 * (may overflow)
                                                 */
-               uint32_t content_size;          /* Size of data in subbuffer */
-               uint32_t packet_size;           /* Subbuffer size (include padding) */
                uint32_t cpu_id;                /* CPU id associated with stream */
                uint8_t header_end;             /* End of header */
        } ctx;
@@ -349,9 +349,9 @@ static void client_buffer_begin(struct lib_ring_buffer *buf, u64 tsc,
        header->stream_id = lttng_chan->id;
        header->ctx.timestamp_begin = tsc;
        header->ctx.timestamp_end = 0;
+       header->ctx.content_size = ~0ULL; /* for debugging */
+       header->ctx.packet_size = ~0ULL;
        header->ctx.events_discarded = 0;
-       header->ctx.content_size = 0xFFFFFFFF; /* for debugging */
-       header->ctx.packet_size = 0xFFFFFFFF;
        header->ctx.cpu_id = buf->backend.cpu;
 }
 
@@ -370,8 +370,10 @@ static void client_buffer_end(struct lib_ring_buffer *buf, u64 tsc,
        unsigned long records_lost = 0;
 
        header->ctx.timestamp_end = tsc;
-       header->ctx.content_size = data_size * CHAR_BIT;        /* in bits */
-       header->ctx.packet_size = PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */
+       header->ctx.content_size =
+               (uint64_t) data_size * CHAR_BIT;                /* in bits */
+       header->ctx.packet_size =
+               (uint64_t) PAGE_ALIGN(data_size) * CHAR_BIT;    /* in bits */
        records_lost += lib_ring_buffer_get_records_lost_full(&client_config, buf);
        records_lost += lib_ring_buffer_get_records_lost_wrap(&client_config, buf);
        records_lost += lib_ring_buffer_get_records_lost_big(&client_config, buf);
@@ -388,6 +390,92 @@ static void client_buffer_finalize(struct lib_ring_buffer *buf, void *priv, int
 {
 }
 
+static struct packet_header *client_packet_header(
+               const struct lib_ring_buffer_config *config,
+               struct lib_ring_buffer *buf)
+{
+       struct lib_ring_buffer_backend *bufb;
+       unsigned long sb_bindex;
+       struct packet_header *header;
+
+       bufb = &buf->backend;
+       sb_bindex = subbuffer_id_get_index(config, bufb->buf_rsb.id);
+       header = (struct packet_header *)
+               lib_ring_buffer_offset_address(bufb,
+                               sb_bindex * bufb->chan->backend.subbuf_size);
+
+       return header;
+}
+
+static int client_timestamp_begin(const struct lib_ring_buffer_config *config,
+               struct lib_ring_buffer *buf,
+               uint64_t *timestamp_begin)
+{
+       struct packet_header *header = client_packet_header(config, buf);
+       *timestamp_begin = header->ctx.timestamp_begin;
+
+       return 0;
+}
+
+static int client_timestamp_end(const struct lib_ring_buffer_config *config,
+                       struct lib_ring_buffer *buf,
+                       uint64_t *timestamp_end)
+{
+       struct packet_header *header = client_packet_header(config, buf);
+       *timestamp_end = header->ctx.timestamp_end;
+
+       return 0;
+}
+
+static int client_events_discarded(const struct lib_ring_buffer_config *config,
+                       struct lib_ring_buffer *buf,
+                       uint64_t *events_discarded)
+{
+       struct packet_header *header = client_packet_header(config, buf);
+       *events_discarded = header->ctx.events_discarded;
+
+       return 0;
+}
+
+static int client_content_size(const struct lib_ring_buffer_config *config,
+                       struct lib_ring_buffer *buf,
+                       uint64_t *content_size)
+{
+       struct packet_header *header = client_packet_header(config, buf);
+       *content_size = header->ctx.content_size;
+
+       return 0;
+}
+
+static int client_packet_size(const struct lib_ring_buffer_config *config,
+                       struct lib_ring_buffer *buf,
+                       uint64_t *packet_size)
+{
+       struct packet_header *header = client_packet_header(config, buf);
+       *packet_size = header->ctx.packet_size;
+
+       return 0;
+}
+
+static int client_stream_id(const struct lib_ring_buffer_config *config,
+                       struct lib_ring_buffer *buf,
+                       uint64_t *stream_id)
+{
+       struct packet_header *header = client_packet_header(config, buf);
+       *stream_id = header->stream_id;
+
+       return 0;
+}
+
+static int client_current_timestamp(const struct lib_ring_buffer_config *config,
+               struct lib_ring_buffer *bufb,
+               uint64_t *ts)
+{
+       *ts = config->cb.ring_buffer_clock_read(bufb->backend.chan);
+
+       return 0;
+}
+
 static const struct lib_ring_buffer_config client_config = {
        .cb.ring_buffer_clock_read = client_ring_buffer_clock_read,
        .cb.record_header_size = client_record_header_size,
@@ -415,6 +503,14 @@ struct channel *_channel_create(const char *name,
                                unsigned int switch_timer_interval,
                                unsigned int read_timer_interval)
 {
+       lttng_chan->ops->timestamp_begin = client_timestamp_begin;
+       lttng_chan->ops->timestamp_end = client_timestamp_end;
+       lttng_chan->ops->events_discarded = client_events_discarded;
+       lttng_chan->ops->content_size = client_content_size;
+       lttng_chan->ops->packet_size = client_packet_size;
+       lttng_chan->ops->stream_id = client_stream_id;
+       lttng_chan->ops->current_timestamp = client_current_timestamp;
+
        return channel_create(&client_config, name, lttng_chan, buf_addr,
                              subbuf_size, num_subbuf, switch_timer_interval,
                              read_timer_interval);
@@ -513,7 +609,7 @@ static
 void lttng_event_write_from_user(struct lib_ring_buffer_ctx *ctx,
                               const void __user *src, size_t len)
 {
-       lib_ring_buffer_copy_from_user(&client_config, ctx, src, len);
+       lib_ring_buffer_copy_from_user_inatomic(&client_config, ctx, src, len);
 }
 
 static