-/*
- * 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 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 */
-};
-
-static inline notrace u64 lib_ring_buffer_clock_read(struct channel *chan)
-{
- return trace_clock_read64();
-}
-
-/*
- * 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(config, 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 += 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;
- }
- }
-
- *pre_header_padding = padding;
- return offset - orig_offset;
-}
-
-#include <linux/ringbuffer/api.h>
-
-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).
- *
- * @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);
-}
-
-#if 0
-/*
- * 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;
-}
-#endif //0
-
-/*
- * Control channels :
- * control/metadata
- * control/interrupts
- * control/...
- *
- * cpu channel :
- * cpu
- */
-#define LTT_RELAY_ROOT "ltt"
-
-#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"