*/
#include <linux/module.h>
+#include <linux/types.h>
+#include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */
+#include "wrapper/trace-clock.h"
+#include "ltt-events.h"
#include "ltt-tracer.h"
-struct ring_buffer_priv {
- struct dentry *dentry;
+static inline notrace u64 lib_ring_buffer_clock_read(struct channel *chan)
+{
+ return trace_clock_read64();
}
-struct channel_priv {
- struct ltt_trace *trace;
- struct ring_buffer_priv *buf;
-};
+/*
+ * record_header_size - Calculate the header size and padding necessary.
+ * @config: ring buffer instance configuration
+ * @chan: channel
+ * @offset: offset in the write buffer
+ * @data_size: size of the payload
+ * @pre_header_padding: padding to add before the header (output)
+ * @rflags: reservation flags
+ * @ctx: reservation context
+ *
+ * Returns the event header size (including padding).
+ *
+ * Important note :
+ * The event header must be 32-bits. The total offset calculated here :
+ *
+ * Alignment of header struct on 32 bits (min arch size, header size)
+ * + sizeof(header struct) (32-bits)
+ * + (opt) u16 (ext. event id)
+ * + (opt) u16 (event_size)
+ * (if event_size == LTT_MAX_SMALL_SIZE, has ext. event size)
+ * + (opt) u32 (ext. event size)
+ * + (opt) u64 full TSC (aligned on min(64-bits, arch size))
+ *
+ * The payload must itself determine its own alignment from the biggest type it
+ * contains.
+ */
+static __inline__
+unsigned char record_header_size(const struct lib_ring_buffer_config *config,
+ struct channel *chan, size_t offset,
+ size_t data_size, size_t *pre_header_padding,
+ unsigned int rflags,
+ struct lib_ring_buffer_ctx *ctx)
+{
+ size_t orig_offset = offset;
+ size_t padding;
+
+ BUILD_BUG_ON(sizeof(struct event_header) != sizeof(u32));
+
+ padding = lib_ring_buffer_align(offset,
+ sizeof(struct event_header));
+ offset += padding;
+ offset += sizeof(struct event_header);
+
+ if (unlikely(rflags)) {
+ switch (rflags) {
+ case LTT_RFLAG_ID_SIZE_TSC:
+ offset += sizeof(u16) + sizeof(u16);
+ if (data_size >= LTT_MAX_SMALL_SIZE)
+ offset += sizeof(u32);
+ offset += lib_ring_buffer_align(offset, sizeof(u64));
+ offset += sizeof(u64);
+ break;
+ case LTT_RFLAG_ID_SIZE:
+ offset += sizeof(u16) + sizeof(u16);
+ if (data_size >= LTT_MAX_SMALL_SIZE)
+ offset += sizeof(u32);
+ break;
+ case LTT_RFLAG_ID:
+ offset += sizeof(u16);
+ break;
+ }
+ }
+
+ *pre_header_padding = padding;
+ return offset - orig_offset;
+}
+
+#include "wrapper/ringbuffer/api.h"
+
+extern
+void ltt_write_event_header_slow(const struct lib_ring_buffer_config *config,
+ struct lib_ring_buffer_ctx *ctx,
+ u16 eID, u32 event_size);
+
+/*
+ * ltt_write_event_header
+ *
+ * Writes the event header to the offset (already aligned on 32-bits).
+ *
+ * @config: ring buffer instance configuration
+ * @ctx: reservation context
+ * @eID : event ID
+ * @event_size : size of the event, excluding the event header.
+ */
+static __inline__
+void ltt_write_event_header(const struct lib_ring_buffer_config *config,
+ struct lib_ring_buffer_ctx *ctx,
+ u16 eID, u32 event_size)
+{
+ struct event_header header;
+
+ if (unlikely(ctx->rflags))
+ goto slow_path;
+
+ header.id_time = eID << LTT_TSC_BITS;
+ header.id_time |= (u32)ctx->tsc & LTT_TSC_MASK;
+ lib_ring_buffer_write(config, ctx, &header, sizeof(header));
+
+slow_path:
+ ltt_write_event_header_slow(config, ctx, eID, event_size);
+}
+
+/**
+ * ltt_write_trace_header - Write trace header
+ * @priv: Private data (struct trace)
+ * @header: Memory address where the information must be written to
+ */
+static __inline__
+void write_trace_header(const struct lib_ring_buffer_config *config,
+ struct packet_header *header)
+{
+ header->magic = CTF_MAGIC_NUMBER;
+#if 0
+ /* TODO: move start time to metadata */
+ header->major_version = LTT_TRACER_VERSION_MAJOR;
+ header->minor_version = LTT_TRACER_VERSION_MINOR;
+ header->arch_size = sizeof(void *);
+ header->alignment = lib_ring_buffer_get_alignment(config);
+ header->start_time_sec = ltt_chan->session->start_time.tv_sec;
+ header->start_time_usec = ltt_chan->session->start_time.tv_usec;
+ header->start_freq = ltt_chan->session->start_freq;
+ header->freq_scale = ltt_chan->session->freq_scale;
+#endif //0
+}
+
+void ltt_write_event_header_slow(const struct lib_ring_buffer_config *config,
+ struct lib_ring_buffer_ctx *ctx,
+ u16 eID, u32 event_size)
+{
+ struct event_header header;
+ u16 small_size;
+
+ switch (ctx->rflags) {
+ case LTT_RFLAG_ID_SIZE_TSC:
+ header.id_time = 29 << LTT_TSC_BITS;
+ break;
+ case LTT_RFLAG_ID_SIZE:
+ header.id_time = 30 << LTT_TSC_BITS;
+ break;
+ case LTT_RFLAG_ID:
+ header.id_time = 31 << LTT_TSC_BITS;
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ header.id_time = 0;
+ }
+
+ header.id_time |= (u32)ctx->tsc & LTT_TSC_MASK;
+ lib_ring_buffer_write(config, ctx, &header, sizeof(header));
+
+ switch (ctx->rflags) {
+ case LTT_RFLAG_ID_SIZE_TSC:
+ small_size = (u16)min_t(u32, event_size, LTT_MAX_SMALL_SIZE);
+ lib_ring_buffer_write(config, ctx, &eID, sizeof(u16));
+ lib_ring_buffer_write(config, ctx, &small_size, sizeof(u16));
+ if (small_size == LTT_MAX_SMALL_SIZE)
+ lib_ring_buffer_write(config, ctx, &event_size,
+ sizeof(u32));
+ lib_ring_buffer_align_ctx(ctx, sizeof(u64));
+ lib_ring_buffer_write(config, ctx, &ctx->tsc, sizeof(u64));
+ break;
+ case LTT_RFLAG_ID_SIZE:
+ small_size = (u16)min_t(u32, event_size, LTT_MAX_SMALL_SIZE);
+ lib_ring_buffer_write(config, ctx, &eID, sizeof(u16));
+ lib_ring_buffer_write(config, ctx, &small_size, sizeof(u16));
+ if (small_size == LTT_MAX_SMALL_SIZE)
+ lib_ring_buffer_write(config, ctx, &event_size,
+ sizeof(u32));
+ break;
+ case LTT_RFLAG_ID:
+ lib_ring_buffer_write(config, ctx, &eID, sizeof(u16));
+ break;
+ }
+}
static const struct lib_ring_buffer_config client_config;
}
/**
- * client_subbuffer_header_size - called on buffer-switch to a new sub-buffer
+ * client_packet_header_size - called on buffer-switch to a new sub-buffer
*
* Return header size without padding after the structure. Don't use packed
* structure because gcc generates inefficient code on some architectures
* (powerpc, mips..)
*/
-static size_t client_subbuffer_header_size(void)
+static size_t client_packet_header_size(void)
{
- return offsetof(struct subbuffer_header, header_end);
+ return offsetof(struct packet_header, header_end);
}
static void client_buffer_begin(struct lib_ring_buffer *buf, u64 tsc,
unsigned int subbuf_idx)
{
struct channel *chan = buf->backend.chan;
- struct subbuffer_header *header =
- (struct subbuffer_header *)
+ struct packet_header *header =
+ (struct packet_header *)
lib_ring_buffer_offset_address(&buf->backend,
subbuf_idx * chan->backend.subbuf_size);
- header->cycle_count_begin = tsc;
- header->data_size = 0xFFFFFFFF; /* for debugging */
- write_trace_header(chan->backend.priv, header);
+ header->timestamp_begin = tsc;
+ header->content_size = 0xFFFFFFFF; /* for debugging */
+ write_trace_header(&client_config, header);
}
/*
unsigned int subbuf_idx, unsigned long data_size)
{
struct channel *chan = buf->backend.chan;
- struct subbuffer_header *header =
- (struct subbuffer_header *)
+ struct packet_header *header =
+ (struct packet_header *)
lib_ring_buffer_offset_address(&buf->backend,
subbuf_idx * chan->backend.subbuf_size);
unsigned long records_lost = 0;
- header->data_size = data_size;
- header->subbuf_size = PAGE_ALIGN(data_size);
- header->cycle_count_end = tsc;
+ header->content_size = data_size;
+ header->packet_size = PAGE_ALIGN(data_size);
+ header->timestamp_end = tsc;
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);
header->events_lost = records_lost;
- header->subbuf_corrupt = 0; /* deprecated */
}
static int client_buffer_create(struct lib_ring_buffer *buf, void *priv,
int cpu, const char *name)
{
- struct channel_priv *chan_priv = priv;
- struct ring_buffer_priv *buf_priv;
- struct dentry *trace_dentry;
- char *tmpname;
- int ret = 0;
-
- if (client_config.alloc == RING_BUFFER_ALLOC_PER_CPU)
- buf_priv = per_cpu_ptr(chan_priv->buf, cpu);
- else
- buf_priv = chan_priv->buf;
-
- tmpname = kzalloc(NAME_MAX + 1, GFP_KERNEL);
- if (!tmpname) {
- ret = -ENOMEM;
- goto end;
- }
-
- snprintf(tmpname, NAME_MAX, "%s%s_%d",
- (client_config.mode == RING_BUFFER_OVERWRITE) ? "flight-" : "",
- name, cpu);
-
- trace_dentry = chan_priv->trace->dentry.trace_root;
- buf_priv->dentry = debugfs_create_file(tmpname, S_IRUSR, trace_dentry,
- buf,
- &lib_ring_buffer_file_operations);
- if (!buf_priv->dentry) {
- ret = -ENOMEM;
- goto free_name;
- }
-free_name:
- kfree(tmpname);
-end:
- return ret;
+ return 0;
}
static void client_buffer_finalize(struct lib_ring_buffer *buf, void *priv, int cpu)
{
- struct channel_priv *chan_priv = priv;
- struct lib_ring_buffer_priv *buf_priv;
-
- if (client_config.alloc == RING_BUFFER_ALLOC_PER_CPU)
- buf_priv = per_cpu_ptr(chan_priv->buf, cpu);
- else
- buf_priv = chan_priv->buf;
-
- debugfs_remove(buf_priv->dentry);
}
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,
- .cb.subbuffer_header_size = client_subbuffer_header_size,
+ .cb.subbuffer_header_size = client_packet_header_size,
.cb.buffer_begin = client_buffer_begin,
.cb.buffer_end = client_buffer_end,
.cb.buffer_create = client_buffer_create,
.alloc = RING_BUFFER_ALLOC_PER_CPU,
.sync = RING_BUFFER_SYNC_PER_CPU,
.mode = RING_BUFFER_MODE_TEMPLATE,
-#ifdef RING_BUFFER_ALIGN
- .align = RING_BUFFER_NATURAL,
-#else
- .align = RING_BUFFER_PACKED,
-#endif
.backend = RING_BUFFER_PAGE,
.output = RING_BUFFER_SPLICE,
.oops = RING_BUFFER_OOPS_CONSISTENCY,
};
static
-struct channel *ltt_channel_create(const char *name, struct ltt_trace *trace,
- void *buf_addr,
- size_t subbuf_size, size_t num_subbuf,
- unsigned int switch_timer_interval,
- unsigned int read_timer_interval)
+struct channel *_channel_create(const char *name,
+ struct ltt_session *session, void *buf_addr,
+ size_t subbuf_size, size_t num_subbuf,
+ unsigned int switch_timer_interval,
+ unsigned int read_timer_interval)
{
- struct channel *chan;
- struct chan_priv *chan_priv;
-
- chan_priv = kzalloc(sizeof(struct chan_priv), GFP_KERNEL);
- if (!chan_priv)
- return NULL;
- if (client_config.alloc == RING_BUFFER_ALLOC_PER_CPU) {
- chan_priv->buf = alloc_percpu(struct lib_ring_buffer_priv);
- memset(chan_priv->buf, 0, sizeof(*chan_priv->buf));
- } else
- chan_priv->buf = kzalloc(sizeof(*chan_priv->buf), GFP_KERNEL)
- if (!channel_priv->buf)
- goto free_chan_priv;
- chan_priv->trace = trace;
- chan = channel_create(&client_config, name, chan_priv, buf_addr,
+ return channel_create(&client_config, name, session, buf_addr,
subbuf_size, num_subbuf, switch_timer_interval,
read_timer_interval);
- if (!chan)
- goto free_buf_priv;
- return chan;
-
-free_buf_priv:
- if (client_config.alloc == RING_BUFFER_ALLOC_PER_CPU)
- free_percpu(chan_priv->buf);
- else
- kfree(chan_priv->buf);
-free_chan_priv:
- kfree(chan_priv);
- return NULL;
}
static
void ltt_channel_destroy(struct channel *chan)
{
- struct chan_priv *chan_priv = channel_get_private(chan);
-
channel_destroy(chan);
- if (client_config.alloc == RING_BUFFER_ALLOC_PER_CPU)
- free_percpu(chan_priv->buf);
- else
- kfree(chan_priv->buf);
- kfree(chan_priv);
}
-static void ltt_relay_remove_dirs(struct ltt_trace *trace)
+static
+struct lib_ring_buffer *ltt_buffer_read_open(struct channel *chan)
{
- debugfs_remove(trace->dentry.trace_root);
+ struct lib_ring_buffer *buf;
+ int cpu;
+
+ for_each_channel_cpu(cpu, chan) {
+ buf = channel_get_ring_buffer(&client_config, chan, cpu);
+ if (!lib_ring_buffer_open_read(buf))
+ return buf;
+ }
+ return NULL;
}
-static int ltt_relay_create_dirs(struct ltt_trace *new_trace)
+static
+void ltt_buffer_read_close(struct lib_ring_buffer *buf)
{
- struct dentry *ltt_root_dentry;
- int ret;
-
- ltt_root_dentry = get_ltt_root();
- if (!ltt_root_dentry)
- return ENOENT;
-
- new_trace->dentry.trace_root = debugfs_create_dir(new_trace->trace_name,
- ltt_root_dentry);
- put_ltt_root();
- if (new_trace->dentry.trace_root == NULL) {
- printk(KERN_ERR "LTT : Trace directory name %s already taken\n",
- new_trace->trace_name);
- return EEXIST;
- }
- return 0;
+ lib_ring_buffer_release_read(buf);
+
+}
+
+static
+int ltt_event_reserve(struct lib_ring_buffer_ctx *ctx)
+{
+ int ret, cpu;
+
+ cpu = lib_ring_buffer_get_cpu(&client_config);
+ if (cpu < 0)
+ return -EPERM;
+ ctx->cpu = cpu;
+
+ ret = lib_ring_buffer_reserve(&client_config, ctx);
+ if (ret)
+ goto put;
+ return ret;
+
+put:
+ lib_ring_buffer_put_cpu(&client_config);
+ return ret;
+}
+
+static
+void ltt_event_commit(struct lib_ring_buffer_ctx *ctx)
+{
+ lib_ring_buffer_commit(&client_config, ctx);
+ lib_ring_buffer_put_cpu(&client_config);
+}
+
+static
+void ltt_event_write(struct lib_ring_buffer_ctx *ctx, const void *src,
+ size_t len)
+{
+ lib_ring_buffer_write(&client_config, ctx, src, len);
+}
+
+static
+wait_queue_head_t *ltt_get_reader_wait_queue(struct ltt_channel *chan)
+{
+ return &chan->chan->read_wait;
}
static struct ltt_transport ltt_relay_transport = {
.name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING,
.owner = THIS_MODULE,
.ops = {
- .create_dirs = ltt_relay_create_dirs,
- .remove_dirs = ltt_relay_remove_dirs,
- .create_channel = ltt_channel_create,
- .destroy_channel = ltt_channel_destroy,
+ .channel_create = _channel_create,
+ .channel_destroy = ltt_channel_destroy,
+ .buffer_read_open = ltt_buffer_read_open,
+ .buffer_read_close = ltt_buffer_read_close,
+ .event_reserve = ltt_event_reserve,
+ .event_commit = ltt_event_commit,
+ .event_write = ltt_event_write,
+ .get_reader_wait_queue = ltt_get_reader_wait_queue,
},
};
static int __init ltt_ring_buffer_client_init(void)
{
+ /*
+ * This vmalloc sync all also takes care of the lib ring buffer
+ * vmalloc'd module pages when it is built as a module into LTTng.
+ */
+ wrapper_vmalloc_sync_all();
printk(KERN_INFO "LTT : ltt ring buffer client init\n");
ltt_transport_register(<t_relay_transport);
return 0;
}
+module_init(ltt_ring_buffer_client_init);
+
static void __exit ltt_ring_buffer_client_exit(void)
{
printk(KERN_INFO "LTT : ltt ring buffer client exit\n");
ltt_transport_unregister(<t_relay_transport);
}
+module_exit(ltt_ring_buffer_client_exit);
+
MODULE_LICENSE("GPL and additional rights");
MODULE_AUTHOR("Mathieu Desnoyers");
MODULE_DESCRIPTION("LTTng ring buffer " RING_BUFFER_MODE_TEMPLATE_STRING
projects / lttng-modules.git / blobdiff