#include <linux/limits.h>
#include <linux/list.h>
#include <linux/cache.h>
-#include <linux/kernel.h>
#include <linux/timex.h>
#include <linux/wait.h>
-#include <linux/marker.h>
-#include <linux/trace-clock.h>
-#include <linux/ltt-channels.h>
#include <asm/atomic.h>
#include <asm/local.h>
+#include "wrapper/trace-clock.h"
#include "ltt-tracer-core.h"
-#include "ltt-relay.h"
+#include "ltt-events.h"
-/* Number of bytes to log with a read/write event */
-#define LTT_LOG_RW_SIZE 32L
-
-/* Interval (in jiffies) at which the LTT per-CPU timer fires */
-#define LTT_PERCPU_TIMER_INTERVAL 1
-
-#ifndef LTT_ARCH_TYPE
-#define LTT_ARCH_TYPE LTT_ARCH_TYPE_UNDEFINED
-#endif
+#define LTTNG_VERSION 0
+#define LTTNG_PATCHLEVEL 9
+#define LTTNG_SUBLEVEL 1
-#ifndef LTT_ARCH_VARIANT
-#define LTT_ARCH_VARIANT LTT_ARCH_VARIANT_NONE
+#ifndef CHAR_BIT
+#define CHAR_BIT 8
#endif
-struct ltt_active_marker;
+/* Number of bytes to log with a read/write event */
+#define LTT_LOG_RW_SIZE 32L
/* Maximum number of callbacks per marker */
#define LTT_NR_CALLBACKS 10
+struct ltt_serialize_closure;
+
+/* Serialization callback */
+typedef size_t (*ltt_serialize_cb)(struct lib_ring_buffer *buf,
+ size_t buf_offset,
+ struct ltt_serialize_closure *closure,
+ void *serialize_private,
+ unsigned int stack_pos_ctx,
+ int *largest_align,
+ const char *fmt, va_list *args);
+
struct ltt_serialize_closure {
ltt_serialize_cb *callbacks;
long cb_args[LTT_NR_CALLBACKS];
unsigned int cb_idx;
};
-size_t ltt_serialize_data(struct ltt_chanbuf *buf, size_t buf_offset,
+size_t ltt_serialize_data(struct lib_ring_buffer *buf, size_t buf_offset,
struct ltt_serialize_closure *closure,
void *serialize_private, unsigned int stack_pos_ctx,
int *largest_align, const char *fmt, va_list *args);
-struct ltt_available_probe {
- const char *name; /* probe name */
- const char *format;
- marker_probe_func *probe_func;
- ltt_serialize_cb callbacks[LTT_NR_CALLBACKS];
- struct list_head node; /* registered probes list */
-};
-
enum ltt_channels {
LTT_CHANNEL_METADATA,
LTT_CHANNEL_FD_STATE,
LTT_CHANNEL_DEFAULT,
};
-struct ltt_active_marker {
- struct list_head node; /* active markers list */
- const char *channel;
- const char *name;
- const char *format;
- struct ltt_available_probe *probe;
-};
-
-extern void ltt_vtrace(const struct marker *mdata, void *probe_data,
- void *call_data, const char *fmt, va_list *args);
-extern void ltt_trace(const struct marker *mdata, void *probe_data,
- void *call_data, const char *fmt, ...);
-
-size_t ltt_serialize_printf(struct ltt_chanbuf *buf, unsigned long buf_offset,
- size_t *msg_size, char *output, size_t outlen,
- const char *fmt);
-
/*
- * Unique ID assigned to each registered probe.
- */
-enum marker_id {
- MARKER_ID_SET_MARKER_ID = 0, /* Static IDs available (range 0-7) */
- MARKER_ID_SET_MARKER_FORMAT,
- MARKER_ID_COMPACT, /* Compact IDs (range: 8-127) */
- MARKER_ID_DYNAMIC, /* Dynamic IDs (range: 128-65535) */
-};
-
-/* static ids 0-1 reserved for internal use. */
-#define MARKER_CORE_IDS 2
-static __inline__ enum marker_id marker_id_type(uint16_t id)
-{
- if (id < MARKER_CORE_IDS)
- return (enum marker_id)id;
- else
- return MARKER_ID_DYNAMIC;
-}
-
-struct user_dbg_data {
- unsigned long avail_size;
- unsigned long write;
- unsigned long read;
-};
-
-struct ltt_trace_ops {
- /* First 32 bytes cache-hot cacheline */
- void (*wakeup_channel) (struct ltt_chan *chan);
- int (*user_blocking) (struct ltt_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 *new_trace);
- void (*remove_dirs) (struct ltt_trace *new_trace);
- int (*create_channel) (const char *channel_name, struct ltt_chan *chan,
- struct dentry *parent, size_t sb_size,
- size_t n_sb, int overwrite,
- struct ltt_trace *trace);
- void (*finish_channel) (struct ltt_chan *chan);
- void (*remove_channel) (struct kref *kref);
- void (*remove_channel_files) (struct ltt_chan *chan);
- void (*user_errors) (struct ltt_trace *trace, unsigned int index,
- size_t data_size, struct user_dbg_data *dbg,
- int cpu);
- void (*start_switch_timer) (struct ltt_chan *chan);
- void (*stop_switch_timer) (struct ltt_chan *chan);
-#ifdef CONFIG_HOTPLUG_CPU
- int (*handle_cpuhp) (struct notifier_block *nb, unsigned long action,
- void *hcpu, struct ltt_trace *trace);
-#endif
-};
-
-struct ltt_transport {
- char *name;
- struct module *owner;
- struct list_head node;
- struct ltt_trace_ops ops;
-};
-
-enum trace_mode { LTT_TRACE_NORMAL, LTT_TRACE_FLIGHT, LTT_TRACE_HYBRID };
-
-#define CHANNEL_FLAG_ENABLE (1U<<0)
-#define CHANNEL_FLAG_OVERWRITE (1U<<1)
-
-/* Per-trace information - each trace/flight recorder represented by one */
-struct ltt_trace {
- /* First 32 bytes cache-hot cacheline */
- struct list_head list;
- struct ltt_chan *channels;
- unsigned int nr_channels;
- int active;
- /* Second 32 bytes cache-hot cacheline */
- struct ltt_trace_ops *ops;
- u32 freq_scale;
- u64 start_freq;
- u64 start_tsc;
- unsigned long long start_monotonic;
- struct timeval start_time;
- struct ltt_channel_setting *settings;
- struct {
- struct dentry *trace_root;
- struct dentry *ascii_root;
- } dentry;
- struct kref kref; /* Each channel has a kref of the trace struct */
- struct ltt_transport *transport;
- struct kref ltt_transport_kref;
- wait_queue_head_t kref_wq; /* Place for ltt_trace_destroy to sleep */
- char trace_name[NAME_MAX];
-} ____cacheline_aligned;
-
-/* Hardcoded event headers
+ * Hardcoded event headers
*
* event header for a trace with active heartbeat : 27 bits timestamps
*
* 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)
-
#define LTT_MAX_SMALL_SIZE 0xFFFFU
-/*
- * 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
- * between the start and end of buffer values is not flexible enough. Using an
- * immediate frequency value permits to calculate directly the times for parts
- * of a buffer that would be before a frequency change.
- *
- * Keep the natural field alignment for _each field_ within this structure if
- * you ever add/remove a field from this header. Packed attribute is not used
- * because gcc generates poor code on at least powerpc and mips. Don't ever
- * let gcc add padding between the structure elements.
- */
-struct ltt_subbuffer_header {
- uint64_t cycle_count_begin; /* Cycle count at subbuffer start */
- uint64_t cycle_count_end; /* Cycle count at subbuffer end */
- uint32_t magic_number; /*
- * Trace magic number.
- * contains endianness information.
- */
- uint8_t major_version;
- uint8_t minor_version;
- uint8_t arch_size; /* Architecture pointer size */
- uint8_t alignment; /* LTT data alignment */
- uint64_t start_time_sec; /* NTP-corrected start time */
- uint64_t start_time_usec;
- uint64_t start_freq; /*
- * Frequency at trace start,
- * used all along the trace.
- */
- uint32_t freq_scale; /* Frequency scaling (divisor) */
- uint32_t data_size; /* Size of data in subbuffer */
- uint32_t sb_size; /* Subbuffer size (include padding) */
- uint32_t events_lost; /*
- * Events lost in this subbuffer since
- * the beginning of the trace.
- * (may overflow)
- */
- uint32_t subbuf_corrupt; /*
- * Corrupted (lost) subbuffers since
- * the begginig of the trace.
- * (may overflow)
- */
- uint8_t header_end[0]; /* End of header */
-};
-
-/**
- * ltt_sb_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 __inline__ size_t ltt_sb_header_size(void)
-{
- return offsetof(struct ltt_subbuffer_header, header_end);
-}
-
-/*
- * ltt_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 == 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 ltt_get_header_size(struct ltt_chan *chan, size_t offset,
- size_t data_size, size_t *before_hdr_pad,
- unsigned int rflags)
-{
- size_t orig_offset = offset;
- size_t padding;
-
- BUILD_BUG_ON(sizeof(struct ltt_event_header) != sizeof(u32));
-
- padding = ltt_align(offset, sizeof(struct ltt_event_header));
- offset += padding;
- offset += sizeof(struct ltt_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 += ltt_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;
- }
- }
-
- *before_hdr_pad = padding;
- return offset - orig_offset;
-}
-
-extern
-size_t ltt_write_event_header_slow(struct ltt_chanbuf_alloc *bufa,
- struct ltt_chan_alloc *chana,
- long buf_offset, u16 eID, u32 event_size,
- u64 tsc, unsigned int rflags);
-
-/*
- * ltt_write_event_header
- *
- * Writes the event header to the offset (already aligned on 32-bits).
- *
- * @buf : buffer to write to.
- * @chan : pointer to the channel structure..
- * @buf_offset : buffer offset to write to (aligned on 32 bits).
- * @eID : event ID
- * @event_size : size of the event, excluding the event header.
- * @tsc : time stamp counter.
- * @rflags : reservation flags.
- *
- * returns : offset where the event data must be written.
- */
-static __inline__
-size_t ltt_write_event_header(struct ltt_chanbuf_alloc *bufa,
- struct ltt_chan_alloc *chana,
- long buf_offset, u16 eID, u32 event_size, u64 tsc,
- unsigned int rflags)
-{
- struct ltt_event_header header;
-
- if (unlikely(rflags))
- goto slow_path;
-
- header.id_time = eID << LTT_TSC_BITS;
- header.id_time |= (u32)tsc & LTT_TSC_MASK;
- ltt_relay_write(bufa, chana, buf_offset, &header, sizeof(header));
- buf_offset += sizeof(header);
-
- return buf_offset;
-
-slow_path:
- return ltt_write_event_header_slow(bufa, chana, buf_offset,
- eID, event_size, tsc, rflags);
-}
-
-/*
- * ltt_read_event_header
- * buf_offset must aligned on 32 bits
- */
-static __inline__
-size_t ltt_read_event_header(struct ltt_chanbuf_alloc *bufa, long buf_offset,
- u64 *tsc, u32 *event_size, u16 *eID,
- unsigned int *rflags)
-{
- struct ltt_event_header header;
- u16 small_size;
-
- ltt_relay_read(bufa, buf_offset, &header, sizeof(header));
- buf_offset += sizeof(header);
-
- *event_size = INT_MAX;
- *eID = header.id_time >> LTT_TSC_BITS;
- *tsc = header.id_time & LTT_TSC_MASK;
-
- switch (*eID) {
- case 29:
- *rflags = LTT_RFLAG_ID_SIZE_TSC;
- ltt_relay_read(bufa, buf_offset, eID, sizeof(u16));
- buf_offset += sizeof(u16);
- ltt_relay_read(bufa, buf_offset, &small_size, sizeof(u16));
- buf_offset += sizeof(u16);
- if (small_size == LTT_MAX_SMALL_SIZE) {
- ltt_relay_read(bufa, buf_offset, event_size,
- sizeof(u32));
- buf_offset += sizeof(u32);
- } else
- *event_size = small_size;
- buf_offset += ltt_align(buf_offset, sizeof(u64));
- ltt_relay_read(bufa, buf_offset, tsc, sizeof(u64));
- buf_offset += sizeof(u64);
- break;
- case 30:
- *rflags = LTT_RFLAG_ID_SIZE;
- ltt_relay_read(bufa, buf_offset, eID, sizeof(u16));
- buf_offset += sizeof(u16);
- ltt_relay_read(bufa, buf_offset, &small_size, sizeof(u16));
- buf_offset += sizeof(u16);
- if (small_size == LTT_MAX_SMALL_SIZE) {
- ltt_relay_read(bufa, buf_offset, event_size,
- sizeof(u32));
- buf_offset += sizeof(u32);
- } else
- *event_size = small_size;
- break;
- case 31:
- *rflags = LTT_RFLAG_ID;
- ltt_relay_read(bufa, buf_offset, eID, sizeof(u16));
- buf_offset += sizeof(u16);
- break;
- default:
- *rflags = 0;
- break;
- }
-
- return buf_offset;
-}
-
-/* Lockless LTTng */
-
-/* Buffer offset macros */
-
-/*
- * BUFFER_TRUNC zeroes the subbuffer offset and the subbuffer number parts of
- * the offset, which leaves only the buffer number.
- */
-#define BUFFER_TRUNC(offset, chan) \
- ((offset) & (~((chan)->a.buf_size - 1)))
-#define BUFFER_OFFSET(offset, chan) ((offset) & ((chan)->a.buf_size - 1))
-#define SUBBUF_OFFSET(offset, chan) ((offset) & ((chan)->a.sb_size - 1))
-#define SUBBUF_ALIGN(offset, chan) \
- (((offset) + (chan)->a.sb_size) & (~((chan)->a.sb_size - 1)))
-#define SUBBUF_TRUNC(offset, chan) \
- ((offset) & (~((chan)->a.sb_size - 1)))
-#define SUBBUF_INDEX(offset, chan) \
- (BUFFER_OFFSET((offset), chan) >> (chan)->a.sb_size_order)
-
-/*
- * Control channels :
- * control/metadata
- * control/interrupts
- * control/...
- *
- * cpu channel :
- * cpu
- */
-#define LTT_RELAY_ROOT "ltt"
-#define LTT_RELAY_LOCKED_ROOT "ltt-locked"
-
-#define LTT_METADATA_CHANNEL "metadata_state"
-#define LTT_FD_STATE_CHANNEL "fd_state"
-#define LTT_GLOBAL_STATE_CHANNEL "global_state"
-#define LTT_IRQ_STATE_CHANNEL "irq_state"
-#define LTT_MODULE_STATE_CHANNEL "module_state"
-#define LTT_NETIF_STATE_CHANNEL "netif_state"
-#define LTT_SOFTIRQ_STATE_CHANNEL "softirq_state"
-#define LTT_SWAP_STATE_CHANNEL "swap_state"
-#define LTT_SYSCALL_STATE_CHANNEL "syscall_state"
-#define LTT_TASK_STATE_CHANNEL "task_state"
-#define LTT_VM_STATE_CHANNEL "vm_state"
-#define LTT_FS_CHANNEL "fs"
-#define LTT_INPUT_CHANNEL "input"
-#define LTT_IPC_CHANNEL "ipc"
-#define LTT_KERNEL_CHANNEL "kernel"
-#define LTT_MM_CHANNEL "mm"
-#define LTT_RCU_CHANNEL "rcu"
-
-#define LTT_FLIGHT_PREFIX "flight-"
-
-#define LTT_ASCII "ascii"
+#ifdef RING_BUFFER_ALIGN
+#define ltt_alignof(type) __alignof__(type)
+#else
+#define ltt_alignof(type) 1
+#endif
/* Tracer properties */
-#define LTT_DEFAULT_SUBBUF_SIZE_LOW 65536
-#define LTT_DEFAULT_N_SUBBUFS_LOW 2
-#define LTT_DEFAULT_SUBBUF_SIZE_MED 262144
-#define LTT_DEFAULT_N_SUBBUFS_MED 2
-#define LTT_DEFAULT_SUBBUF_SIZE_HIGH 1048576
-#define LTT_DEFAULT_N_SUBBUFS_HIGH 2
-#define LTT_TRACER_MAGIC_NUMBER 0x00D6B7ED
-#define LTT_TRACER_VERSION_MAJOR 2
-#define LTT_TRACER_VERSION_MINOR 6
+#define CTF_MAGIC_NUMBER 0xC1FC1FC1
+#define TSDL_MAGIC_NUMBER 0x75D11D57
+#define CTF_VERSION_MAJOR 0
+#define CTF_VERSION_MINOR 1
-/**
- * ltt_write_trace_header - Write trace header
- * @trace: Trace information
- * @header: Memory address where the information must be written to
+/*
+ * Number of milliseconds to retry before failing metadata writes on buffer full
+ * condition. (10 seconds)
*/
-static __inline__
-void ltt_write_trace_header(struct ltt_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;
-}
+#define LTTNG_METADATA_TIMEOUT_MSEC 10000
/*
* Size reserved for high priority events (interrupts, NMI, BH) at the end of a
*/
#define LTT_RESERVE_CRITICAL 4096
+#define LTT_RFLAG_EXTENDED RING_BUFFER_RFLAG_END
+#define LTT_RFLAG_END (LTT_RFLAG_EXTENDED << 1)
+
/* Register and unregister function pointers */
enum ltt_module_function {
struct module *owner);
extern void ltt_module_unregister(enum ltt_module_function name);
-void ltt_transport_register(struct ltt_transport *transport);
-void ltt_transport_unregister(struct ltt_transport *transport);
-
/* Exported control function */
-enum ltt_control_msg {
- LTT_CONTROL_START,
- LTT_CONTROL_STOP,
- LTT_CONTROL_CREATE_TRACE,
- LTT_CONTROL_DESTROY_TRACE
-};
-
-union ltt_control_args {
- struct {
- enum trace_mode mode;
- unsigned int subbuf_size_low;
- unsigned int n_subbufs_low;
- unsigned int subbuf_size_med;
- unsigned int n_subbufs_med;
- unsigned int subbuf_size_high;
- unsigned int n_subbufs_high;
- } new_trace;
-};
-
-int _ltt_trace_setup(const char *trace_name);
-int ltt_trace_setup(const char *trace_name);
-struct ltt_trace *_ltt_trace_find_setup(const char *trace_name);
-int ltt_trace_set_type(const char *trace_name, const char *trace_type);
-int ltt_trace_set_channel_subbufsize(const char *trace_name,
- const char *channel_name,
- unsigned int size);
-int ltt_trace_set_channel_subbufcount(const char *trace_name,
- const char *channel_name,
- unsigned int cnt);
-int ltt_trace_set_channel_switch_timer(const char *trace_name,
- const char *channel_name,
- unsigned long interval);
-int ltt_trace_set_channel_enable(const char *trace_name,
- const char *channel_name,
- unsigned int enable);
-int ltt_trace_set_channel_overwrite(const char *trace_name,
- const char *channel_name,
- unsigned int overwrite);
-int ltt_trace_alloc(const char *trace_name);
-int ltt_trace_destroy(const char *trace_name);
-int ltt_trace_start(const char *trace_name);
-int ltt_trace_stop(const char *trace_name);
-
-extern int ltt_control(enum ltt_control_msg msg, const char *trace_name,
- const char *trace_type, union ltt_control_args args);
-
-enum ltt_filter_control_msg {
- LTT_FILTER_DEFAULT_ACCEPT,
- LTT_FILTER_DEFAULT_REJECT
-};
-
-extern int ltt_filter_control(enum ltt_filter_control_msg msg,
- const char *trace_name);
-
-extern struct dentry *get_filter_root(void);
-
void ltt_core_register(int (*function)(u8, void *));
void ltt_core_unregister(void);
-void ltt_release_trace(struct kref *kref);
-void ltt_release_transport(struct kref *kref);
-
-extern int ltt_probe_register(struct ltt_available_probe *pdata);
-extern int ltt_probe_unregister(struct ltt_available_probe *pdata);
-extern int ltt_marker_connect(const char *channel, const char *mname,
- const char *pname);
-extern int ltt_marker_disconnect(const char *channel, const char *mname,
- const char *pname);
-extern void ltt_dump_marker_state(struct ltt_trace *trace);
-
-void ltt_lock_traces(void);
-void ltt_unlock_traces(void);
-
-extern int ltt_ascii_create_dir(struct ltt_trace *new_trace);
-extern void ltt_ascii_remove_dir(struct ltt_trace *trace);
-extern int ltt_ascii_create(struct ltt_chan *chan);
-extern void ltt_ascii_remove(struct ltt_chan *chan);
-
extern
void ltt_statedump_register_kprobes_dump(void (*callback)(void *call_data));
extern
}
#endif
-/* Relay IOCTL */
-
-/* Get the next sub-buffer that can be read. */
-#define RELAY_GET_SB _IOR(0xF5, 0x00, __u32)
-/* Release the oldest reserved (by "get") sub-buffer. */
-#define RELAY_PUT_SB _IOW(0xF5, 0x01, __u32)
-/* returns the number of sub-buffers in the per cpu channel. */
-#define RELAY_GET_N_SB _IOR(0xF5, 0x02, __u32)
-/* returns the size of the current sub-buffer. */
-#define RELAY_GET_SB_SIZE _IOR(0xF5, 0x03, __u32)
-/* returns the maximum size for sub-buffers. */
-#define RELAY_GET_MAX_SB_SIZE _IOR(0xF5, 0x04, __u32)
-
#endif /* _LTT_TRACER_H */
projects / lttng-modules.git / blobdiff