#include <sys/types.h>
#include <stdarg.h>
-//#include "list.h"
#include <ust/kernelcompat.h>
-#include "buffers.h"
#include "channels.h"
#include "tracercore.h"
+#include "tracerconst.h"
#include <ust/marker.h>
#include <ust/probe.h>
int *largest_align, const char *fmt, va_list *args);
struct ltt_probe_private_data {
- struct ltt_trace_struct *trace; /*
+ struct ust_trace *trace; /*
* Target trace, for metadata
* or statedump.
*/
struct ltt_trace_ops {
/* First 32 bytes cache-hot cacheline */
- int (*reserve_slot) (struct ltt_trace_struct *trace,
- struct ust_channel *channel,
- void **transport_data, size_t data_size,
- size_t *slot_size, long *buf_offset, u64 *tsc,
- unsigned int *rflags,
- int largest_align, int cpu);
-//ust// void (*commit_slot) (struct ltt_channel_struct *channel,
-//ust// void **transport_data, long buf_offset,
-//ust// size_t slot_size);
void (*wakeup_channel) (struct ust_channel *channel);
- int (*user_blocking) (struct ltt_trace_struct *trace,
+ int (*user_blocking) (struct ust_trace *trace,
unsigned int index, size_t data_size,
struct user_dbg_data *dbg);
/* End of first 32 bytes cacheline */
- int (*create_dirs) (struct ltt_trace_struct *new_trace);
- void (*remove_dirs) (struct ltt_trace_struct *new_trace);
+ int (*create_dirs) (struct ust_trace *new_trace);
+ void (*remove_dirs) (struct ust_trace *new_trace);
int (*create_channel) (const char *trace_name,
- struct ltt_trace_struct *trace,
+ struct ust_trace *trace,
const char *channel_name,
struct ust_channel *channel,
unsigned int subbuf_size,
unsigned int n_subbufs, int overwrite);
void (*finish_channel) (struct ust_channel *channel);
void (*remove_channel) (struct ust_channel *channel);
- void (*user_errors) (struct ltt_trace_struct *trace,
+ void (*user_errors) (struct ust_trace *trace,
unsigned int index, size_t data_size,
struct user_dbg_data *dbg, unsigned int cpu);
-} ____cacheline_aligned;
+};
struct ltt_transport {
char *name;
#define CHANNEL_FLAG_OVERWRITE (1U<<1)
/* Per-trace information - each trace/flight recorder represented by one */
-struct ltt_trace_struct {
+struct ust_trace {
/* First 32 bytes cache-hot cacheline */
struct list_head list;
struct ltt_trace_ops *ops;
char trace_name[NAME_MAX];
} ____cacheline_aligned;
-/* Hardcoded event headers
- *
- * event header for a trace with active heartbeat : 27 bits timestamps
- *
- * headers are 32-bits aligned. In order to insure such alignment, a dynamic per
- * trace alignment value must be done.
- *
- * Remember that the C compiler does align each member on the boundary
- * equivalent to their own size.
- *
- * As relay subbuffers are aligned on pages, we are sure that they are 4 and 8
- * bytes aligned, so the buffer header and trace header are aligned.
- *
- * Event headers are aligned depending on the trace alignment option.
- *
- * Note using C structure bitfields for cross-endianness and portability
- * concerns.
- */
-
-#define LTT_RESERVED_EVENTS 3
-#define LTT_EVENT_BITS 5
-#define LTT_FREE_EVENTS ((1 << LTT_EVENT_BITS) - LTT_RESERVED_EVENTS)
-#define LTT_TSC_BITS 27
-#define LTT_TSC_MASK ((1 << LTT_TSC_BITS) - 1)
-
-struct ltt_event_header {
- u32 id_time; /* 5 bits event id (MSB); 27 bits time (LSB) */
-};
-
-/* Reservation flags */
-#define LTT_RFLAG_ID (1 << 0)
-#define LTT_RFLAG_ID_SIZE (1 << 1)
-#define LTT_RFLAG_ID_SIZE_TSC (1 << 2)
-
/*
* We use asm/timex.h : cpu_khz/HZ variable in here : we might have to deal
* specifically with CPU frequency scaling someday, so using an interpolation
return offsetof(struct ltt_subbuffer_header, header_end);
}
-/*
- * ust_get_header_size
- *
- * Calculate alignment offset to 32-bits. This is the alignment offset of the
- * event header.
- *
- * 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 == 0xFFFFUL, 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 ust_get_header_size(
- struct ust_channel *channel,
- size_t offset,
- size_t data_size,
- size_t *before_hdr_pad,
- unsigned int rflags)
-{
- size_t orig_offset = offset;
- size_t padding;
-
- padding = ltt_align(offset, sizeof(struct ltt_event_header));
- offset += padding;
- offset += sizeof(struct ltt_event_header);
-
- switch (rflags) {
- case LTT_RFLAG_ID_SIZE_TSC:
- offset += sizeof(u16) + sizeof(u16);
- if (data_size >= 0xFFFFU)
- offset += sizeof(u32);
- offset += ltt_align(offset, sizeof(u64));
- offset += sizeof(u64);
- break;
- case LTT_RFLAG_ID_SIZE:
- offset += sizeof(u16) + sizeof(u16);
- if (data_size >= 0xFFFFU)
- offset += sizeof(u32);
- break;
- case LTT_RFLAG_ID:
- offset += sizeof(u16);
- break;
- }
-
- *before_hdr_pad = padding;
- return offset - orig_offset;
-}
+extern size_t ltt_write_event_header_slow(struct ust_trace *trace,
+ struct ust_channel *channel,
+ struct ust_buffer *buf, long buf_offset,
+ u16 eID, u32 event_size,
+ u64 tsc, unsigned int rflags);
+
/*
* ltt_write_event_header
*
* returns : offset where the event data must be written.
*/
-static __inline__ size_t ltt_write_event_header(struct ltt_trace_struct *trace,
+static __inline__ size_t ltt_write_event_header(struct ust_trace *trace,
+ struct ust_channel *channel,
struct ust_buffer *buf, long buf_offset,
- u16 eID, size_t event_size,
+ u16 eID, u32 event_size,
u64 tsc, unsigned int rflags)
{
struct ltt_event_header header;
- size_t small_size;
-
- switch (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:
- header.id_time = eID << LTT_TSC_BITS;
- break;
- }
- header.id_time |= (u32)tsc & LTT_TSC_MASK;
- ust_buffers_write(buf, buf_offset, &header, sizeof(header));
- buf_offset += sizeof(header);
-
- switch (rflags) {
- case LTT_RFLAG_ID_SIZE_TSC:
- small_size = min_t(size_t, event_size, 0xFFFFU);
- ust_buffers_write(buf, buf_offset,
- (u16[]){ (u16)eID }, sizeof(u16));
- buf_offset += sizeof(u16);
- ust_buffers_write(buf, buf_offset,
- (u16[]){ (u16)small_size }, sizeof(u16));
- buf_offset += sizeof(u16);
- if (small_size == 0xFFFFU) {
- ust_buffers_write(buf, buf_offset,
- (u32[]){ (u32)event_size }, sizeof(u32));
- buf_offset += sizeof(u32);
- }
- buf_offset += ltt_align(buf_offset, sizeof(u64));
- ust_buffers_write(buf, buf_offset,
- (u64[]){ (u64)tsc }, sizeof(u64));
- buf_offset += sizeof(u64);
- break;
- case LTT_RFLAG_ID_SIZE:
- small_size = min_t(size_t, event_size, 0xFFFFU);
- ust_buffers_write(buf, buf_offset,
- (u16[]){ (u16)eID }, sizeof(u16));
- buf_offset += sizeof(u16);
- ust_buffers_write(buf, buf_offset,
- (u16[]){ (u16)small_size }, sizeof(u16));
- buf_offset += sizeof(u16);
- if (small_size == 0xFFFFU) {
- ust_buffers_write(buf, buf_offset,
- (u32[]){ (u32)event_size }, sizeof(u32));
- buf_offset += sizeof(u32);
- }
- break;
- case LTT_RFLAG_ID:
- ust_buffers_write(buf, buf_offset,
- (u16[]){ (u16)eID }, sizeof(u16));
- buf_offset += sizeof(u16);
- break;
- default:
- break;
- }
-
- return buf_offset;
-}
-/* Lockless LTTng */
+ if (unlikely(rflags))
+ goto slow_path;
-/*
- * ltt_reserve_slot
- *
- * Atomic slot reservation in a LTTng buffer. It will take care of
- * sub-buffer switching.
- *
- * Parameters:
- *
- * @trace : the trace structure to log to.
- * @channel : the chanel to reserve space into.
- * @transport_data : specific transport data.
- * @data_size : size of the variable length data to log.
- * @slot_size : pointer to total size of the slot (out)
- * @buf_offset : pointer to reserve offset (out)
- * @tsc : pointer to the tsc at the slot reservation (out)
- * @rflags : reservation flags (header specificity)
- * @cpu : cpu id
- *
- * Return : -ENOSPC if not enough space, else 0.
- */
-static __inline__ int ltt_reserve_slot(
- struct ltt_trace_struct *trace,
- struct ust_channel *channel,
- void **transport_data,
- size_t data_size,
- size_t *slot_size,
- long *buf_offset,
- u64 *tsc,
- unsigned int *rflags,
- int largest_align, int cpu)
-{
- return trace->ops->reserve_slot(trace, channel, transport_data,
- data_size, slot_size, buf_offset, tsc, rflags,
- largest_align, cpu);
-}
+ header.id_time = eID << LTT_TSC_BITS;
+ return buf_offset;
-///*
-// * ltt_commit_slot
-// *
-// * Atomic unordered slot commit. Increments the commit count in the
-// * specified sub-buffer, and delivers it if necessary.
-// *
-// * Parameters:
-// *
-// * @channel : the chanel to reserve space into.
-// * @transport_data : specific transport data.
-// * @buf_offset : offset of beginning of reserved slot
-// * @slot_size : size of the reserved slot.
-// */
-//static inline void ltt_commit_slot(
-// struct ltt_channel_struct *channel,
-// void **transport_data,
-// long buf_offset,
-// size_t slot_size)
-//{
-// struct ltt_trace_struct *trace = channel->trace;
-//
-// trace->ops->commit_slot(channel, transport_data, buf_offset, slot_size);
-//}
+slow_path:
+ return ltt_write_event_header_slow(trace, channel, buf, buf_offset,
+ eID, event_size, tsc, rflags);
+}
/*
* Control channels :
#define LTT_TRACER_VERSION_MAJOR 2
#define LTT_TRACER_VERSION_MINOR 3
+/**
+ * ust_write_trace_header - Write trace header
+ * @trace: Trace information
+ * @header: Memory address where the information must be written to
+ */
+static __inline__ void ltt_write_trace_header(struct ust_trace *trace,
+ struct ltt_subbuffer_header *header)
+{
+ header->magic_number = LTT_TRACER_MAGIC_NUMBER;
+ header->major_version = LTT_TRACER_VERSION_MAJOR;
+ header->minor_version = LTT_TRACER_VERSION_MINOR;
+ header->arch_size = sizeof(void *);
+ header->alignment = ltt_get_alignment();
+ header->start_time_sec = trace->start_time.tv_sec;
+ header->start_time_usec = trace->start_time.tv_usec;
+ header->start_freq = trace->start_freq;
+ header->freq_scale = trace->freq_scale;
+}
+
+
/*
* Size reserved for high priority events (interrupts, NMI, BH) at the end of a
* nearly full buffer. User space won't use this last amount of space when in
extern int _ltt_trace_setup(const char *trace_name);
extern int ltt_trace_setup(const char *trace_name);
-extern struct ltt_trace_struct *_ltt_trace_find_setup(const char *trace_name);
+extern struct ust_trace *_ltt_trace_find_setup(const char *trace_name);
extern int ltt_trace_set_type(const char *trace_name, const char *trace_type);
extern int ltt_trace_set_channel_subbufsize(const char *trace_name,
const char *channel_name, unsigned int size);
extern struct dentry *get_filter_root(void);
-extern void ltt_write_trace_header(struct ltt_trace_struct *trace,
+extern void ltt_write_trace_header(struct ust_trace *trace,
struct ltt_subbuffer_header *header);
extern void ltt_buffer_destroy(struct ust_channel *ltt_chan);
extern void ltt_release_trace(struct kref *kref);
extern void ltt_release_transport(struct kref *kref);
-extern void ltt_dump_marker_state(struct ltt_trace_struct *trace);
+extern void ltt_dump_marker_state(struct ust_trace *trace);
extern void ltt_lock_traces(void);
extern void ltt_unlock_traces(void);
-extern struct ltt_trace_struct *_ltt_trace_find(const char *trace_name);
+extern struct ust_trace *_ltt_trace_find(const char *trace_name);
#endif /* _LTT_TRACER_H */
projects / ust.git / blobdiff