diff options
Diffstat (limited to '')
| -rw-r--r-- | kernel/trace/trace_output.c | 1416 |
1 files changed, 1416 insertions, 0 deletions
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c new file mode 100644 index 000000000..6e6cc64fa --- /dev/null +++ b/kernel/trace/trace_output.c @@ -0,0 +1,1416 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * trace_output.c + * + * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> + * + */ +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/ftrace.h> +#include <linux/sched/clock.h> +#include <linux/sched/mm.h> + +#include "trace_output.h" + +/* must be a power of 2 */ +#define EVENT_HASHSIZE 128 + +DECLARE_RWSEM(trace_event_sem); + +static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly; + +static int next_event_type = __TRACE_LAST_TYPE + 1; + +enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter) +{ + struct trace_seq *s = &iter->seq; + struct trace_entry *entry = iter->ent; + struct bputs_entry *field; + + trace_assign_type(field, entry); + + trace_seq_puts(s, field->str); + + return trace_handle_return(s); +} + +enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter) +{ + struct trace_seq *s = &iter->seq; + struct trace_entry *entry = iter->ent; + struct bprint_entry *field; + + trace_assign_type(field, entry); + + trace_seq_bprintf(s, field->fmt, field->buf); + + return trace_handle_return(s); +} + +enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter) +{ + struct trace_seq *s = &iter->seq; + struct trace_entry *entry = iter->ent; + struct print_entry *field; + + trace_assign_type(field, entry); + + trace_seq_puts(s, field->buf); + + return trace_handle_return(s); +} + +const char * +trace_print_flags_seq(struct trace_seq *p, const char *delim, + unsigned long flags, + const struct trace_print_flags *flag_array) +{ + unsigned long mask; + const char *str; + const char *ret = trace_seq_buffer_ptr(p); + int i, first = 1; + + for (i = 0; flag_array[i].name && flags; i++) { + + mask = flag_array[i].mask; + if ((flags & mask) != mask) + continue; + + str = flag_array[i].name; + flags &= ~mask; + if (!first && delim) + trace_seq_puts(p, delim); + else + first = 0; + trace_seq_puts(p, str); + } + + /* check for left over flags */ + if (flags) { + if (!first && delim) + trace_seq_puts(p, delim); + trace_seq_printf(p, "0x%lx", flags); + } + + trace_seq_putc(p, 0); + + return ret; +} +EXPORT_SYMBOL(trace_print_flags_seq); + +const char * +trace_print_symbols_seq(struct trace_seq *p, unsigned long val, + const struct trace_print_flags *symbol_array) +{ + int i; + const char *ret = trace_seq_buffer_ptr(p); + + for (i = 0; symbol_array[i].name; i++) { + + if (val != symbol_array[i].mask) + continue; + + trace_seq_puts(p, symbol_array[i].name); + break; + } + + if (ret == (const char *)(trace_seq_buffer_ptr(p))) + trace_seq_printf(p, "0x%lx", val); + + trace_seq_putc(p, 0); + + return ret; +} +EXPORT_SYMBOL(trace_print_symbols_seq); + +#if BITS_PER_LONG == 32 +const char * +trace_print_flags_seq_u64(struct trace_seq *p, const char *delim, + unsigned long long flags, + const struct trace_print_flags_u64 *flag_array) +{ + unsigned long long mask; + const char *str; + const char *ret = trace_seq_buffer_ptr(p); + int i, first = 1; + + for (i = 0; flag_array[i].name && flags; i++) { + + mask = flag_array[i].mask; + if ((flags & mask) != mask) + continue; + + str = flag_array[i].name; + flags &= ~mask; + if (!first && delim) + trace_seq_puts(p, delim); + else + first = 0; + trace_seq_puts(p, str); + } + + /* check for left over flags */ + if (flags) { + if (!first && delim) + trace_seq_puts(p, delim); + trace_seq_printf(p, "0x%llx", flags); + } + + trace_seq_putc(p, 0); + + return ret; +} +EXPORT_SYMBOL(trace_print_flags_seq_u64); + +const char * +trace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val, + const struct trace_print_flags_u64 *symbol_array) +{ + int i; + const char *ret = trace_seq_buffer_ptr(p); + + for (i = 0; symbol_array[i].name; i++) { + + if (val != symbol_array[i].mask) + continue; + + trace_seq_puts(p, symbol_array[i].name); + break; + } + + if (ret == (const char *)(trace_seq_buffer_ptr(p))) + trace_seq_printf(p, "0x%llx", val); + + trace_seq_putc(p, 0); + + return ret; +} +EXPORT_SYMBOL(trace_print_symbols_seq_u64); +#endif + +const char * +trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr, + unsigned int bitmask_size) +{ + const char *ret = trace_seq_buffer_ptr(p); + + trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8); + trace_seq_putc(p, 0); + + return ret; +} +EXPORT_SYMBOL_GPL(trace_print_bitmask_seq); + +/** + * trace_print_hex_seq - print buffer as hex sequence + * @p: trace seq struct to write to + * @buf: The buffer to print + * @buf_len: Length of @buf in bytes + * @concatenate: Print @buf as single hex string or with spacing + * + * Prints the passed buffer as a hex sequence either as a whole, + * single hex string if @concatenate is true or with spacing after + * each byte in case @concatenate is false. + */ +const char * +trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len, + bool concatenate) +{ + int i; + const char *ret = trace_seq_buffer_ptr(p); + + for (i = 0; i < buf_len; i++) + trace_seq_printf(p, "%s%2.2x", concatenate || i == 0 ? "" : " ", + buf[i]); + trace_seq_putc(p, 0); + + return ret; +} +EXPORT_SYMBOL(trace_print_hex_seq); + +const char * +trace_print_array_seq(struct trace_seq *p, const void *buf, int count, + size_t el_size) +{ + const char *ret = trace_seq_buffer_ptr(p); + const char *prefix = ""; + void *ptr = (void *)buf; + size_t buf_len = count * el_size; + + trace_seq_putc(p, '{'); + + while (ptr < buf + buf_len) { + switch (el_size) { + case 1: + trace_seq_printf(p, "%s0x%x", prefix, + *(u8 *)ptr); + break; + case 2: + trace_seq_printf(p, "%s0x%x", prefix, + *(u16 *)ptr); + break; + case 4: + trace_seq_printf(p, "%s0x%x", prefix, + *(u32 *)ptr); + break; + case 8: + trace_seq_printf(p, "%s0x%llx", prefix, + *(u64 *)ptr); + break; + default: + trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size, + *(u8 *)ptr); + el_size = 1; + } + prefix = ","; + ptr += el_size; + } + + trace_seq_putc(p, '}'); + trace_seq_putc(p, 0); + + return ret; +} +EXPORT_SYMBOL(trace_print_array_seq); + +int trace_raw_output_prep(struct trace_iterator *iter, + struct trace_event *trace_event) +{ + struct trace_event_call *event; + struct trace_seq *s = &iter->seq; + struct trace_seq *p = &iter->tmp_seq; + struct trace_entry *entry; + + event = container_of(trace_event, struct trace_event_call, event); + entry = iter->ent; + + if (entry->type != event->event.type) { + WARN_ON_ONCE(1); + return TRACE_TYPE_UNHANDLED; + } + + trace_seq_init(p); + trace_seq_printf(s, "%s: ", trace_event_name(event)); + + return trace_handle_return(s); +} +EXPORT_SYMBOL(trace_raw_output_prep); + +static int trace_output_raw(struct trace_iterator *iter, char *name, + char *fmt, va_list ap) +{ + struct trace_seq *s = &iter->seq; + + trace_seq_printf(s, "%s: ", name); + trace_seq_vprintf(s, fmt, ap); + + return trace_handle_return(s); +} + +int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...) +{ + va_list ap; + int ret; + + va_start(ap, fmt); + ret = trace_output_raw(iter, name, fmt, ap); + va_end(ap); + + return ret; +} +EXPORT_SYMBOL_GPL(trace_output_call); + +#ifdef CONFIG_KRETPROBES +static inline const char *kretprobed(const char *name) +{ + static const char tramp_name[] = "kretprobe_trampoline"; + int size = sizeof(tramp_name); + + if (strncmp(tramp_name, name, size) == 0) + return "[unknown/kretprobe'd]"; + return name; +} +#else +static inline const char *kretprobed(const char *name) +{ + return name; +} +#endif /* CONFIG_KRETPROBES */ + +static void +seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) +{ + char str[KSYM_SYMBOL_LEN]; +#ifdef CONFIG_KALLSYMS + const char *name; + + kallsyms_lookup(address, NULL, NULL, NULL, str); + + name = kretprobed(str); + + if (name && strlen(name)) { + trace_seq_printf(s, fmt, name); + return; + } +#endif + snprintf(str, KSYM_SYMBOL_LEN, "0x%08lx", address); + trace_seq_printf(s, fmt, str); +} + +static void +seq_print_sym_offset(struct trace_seq *s, const char *fmt, + unsigned long address) +{ + char str[KSYM_SYMBOL_LEN]; +#ifdef CONFIG_KALLSYMS + const char *name; + + sprint_symbol(str, address); + name = kretprobed(str); + + if (name && strlen(name)) { + trace_seq_printf(s, fmt, name); + return; + } +#endif + snprintf(str, KSYM_SYMBOL_LEN, "0x%08lx", address); + trace_seq_printf(s, fmt, str); +} + +#ifndef CONFIG_64BIT +# define IP_FMT "%08lx" +#else +# define IP_FMT "%016lx" +#endif + +static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, + unsigned long ip, unsigned long sym_flags) +{ + struct file *file = NULL; + unsigned long vmstart = 0; + int ret = 1; + + if (s->full) + return 0; + + if (mm) { + const struct vm_area_struct *vma; + + down_read(&mm->mmap_sem); + vma = find_vma(mm, ip); + if (vma) { + file = vma->vm_file; + vmstart = vma->vm_start; + } + if (file) { + ret = trace_seq_path(s, &file->f_path); + if (ret) + trace_seq_printf(s, "[+0x%lx]", + ip - vmstart); + } + up_read(&mm->mmap_sem); + } + if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file)) + trace_seq_printf(s, " <" IP_FMT ">", ip); + return !trace_seq_has_overflowed(s); +} + +int +seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) +{ + if (!ip) { + trace_seq_putc(s, '0'); + goto out; + } + + if (sym_flags & TRACE_ITER_SYM_OFFSET) + seq_print_sym_offset(s, "%s", ip); + else + seq_print_sym_short(s, "%s", ip); + + if (sym_flags & TRACE_ITER_SYM_ADDR) + trace_seq_printf(s, " <" IP_FMT ">", ip); + + out: + return !trace_seq_has_overflowed(s); +} + +/** + * trace_print_lat_fmt - print the irq, preempt and lockdep fields + * @s: trace seq struct to write to + * @entry: The trace entry field from the ring buffer + * + * Prints the generic fields of irqs off, in hard or softirq, preempt + * count. + */ +int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry) +{ + char hardsoft_irq; + char need_resched; + char irqs_off; + int hardirq; + int softirq; + int nmi; + + nmi = entry->flags & TRACE_FLAG_NMI; + hardirq = entry->flags & TRACE_FLAG_HARDIRQ; + softirq = entry->flags & TRACE_FLAG_SOFTIRQ; + + irqs_off = + (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : + (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' : + '.'; + + switch (entry->flags & (TRACE_FLAG_NEED_RESCHED | + TRACE_FLAG_PREEMPT_RESCHED)) { + case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED: + need_resched = 'N'; + break; + case TRACE_FLAG_NEED_RESCHED: + need_resched = 'n'; + break; + case TRACE_FLAG_PREEMPT_RESCHED: + need_resched = 'p'; + break; + default: + need_resched = '.'; + break; + } + + hardsoft_irq = + (nmi && hardirq) ? 'Z' : + nmi ? 'z' : + (hardirq && softirq) ? 'H' : + hardirq ? 'h' : + softirq ? 's' : + '.' ; + + trace_seq_printf(s, "%c%c%c", + irqs_off, need_resched, hardsoft_irq); + + if (entry->preempt_count) + trace_seq_printf(s, "%x", entry->preempt_count); + else + trace_seq_putc(s, '.'); + + return !trace_seq_has_overflowed(s); +} + +static int +lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) +{ + char comm[TASK_COMM_LEN]; + + trace_find_cmdline(entry->pid, comm); + + trace_seq_printf(s, "%8.8s-%-5d %3d", + comm, entry->pid, cpu); + + return trace_print_lat_fmt(s, entry); +} + +#undef MARK +#define MARK(v, s) {.val = v, .sym = s} +/* trace overhead mark */ +static const struct trace_mark { + unsigned long long val; /* unit: nsec */ + char sym; +} mark[] = { + MARK(1000000000ULL , '$'), /* 1 sec */ + MARK(100000000ULL , '@'), /* 100 msec */ + MARK(10000000ULL , '*'), /* 10 msec */ + MARK(1000000ULL , '#'), /* 1000 usecs */ + MARK(100000ULL , '!'), /* 100 usecs */ + MARK(10000ULL , '+'), /* 10 usecs */ +}; +#undef MARK + +char trace_find_mark(unsigned long long d) +{ + int i; + int size = ARRAY_SIZE(mark); + + for (i = 0; i < size; i++) { + if (d > mark[i].val) + break; + } + + return (i == size) ? ' ' : mark[i].sym; +} + +static int +lat_print_timestamp(struct trace_iterator *iter, u64 next_ts) +{ + struct trace_array *tr = iter->tr; + unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE; + unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS; + unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start; + unsigned long long rel_ts = next_ts - iter->ts; + struct trace_seq *s = &iter->seq; + + if (in_ns) { + abs_ts = ns2usecs(abs_ts); + rel_ts = ns2usecs(rel_ts); + } + + if (verbose && in_ns) { + unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC); + unsigned long abs_msec = (unsigned long)abs_ts; + unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC); + unsigned long rel_msec = (unsigned long)rel_ts; + + trace_seq_printf( + s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ", + ns2usecs(iter->ts), + abs_msec, abs_usec, + rel_msec, rel_usec); + + } else if (verbose && !in_ns) { + trace_seq_printf( + s, "[%016llx] %lld (+%lld): ", + iter->ts, abs_ts, rel_ts); + + } else if (!verbose && in_ns) { + trace_seq_printf( + s, " %4lldus%c: ", + abs_ts, + trace_find_mark(rel_ts * NSEC_PER_USEC)); + + } else { /* !verbose && !in_ns */ + trace_seq_printf(s, " %4lld: ", abs_ts); + } + + return !trace_seq_has_overflowed(s); +} + +int trace_print_context(struct trace_iterator *iter) +{ + struct trace_array *tr = iter->tr; + struct trace_seq *s = &iter->seq; + struct trace_entry *entry = iter->ent; + unsigned long long t; + unsigned long secs, usec_rem; + char comm[TASK_COMM_LEN]; + + trace_find_cmdline(entry->pid, comm); + + trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); + + if (tr->trace_flags & TRACE_ITER_RECORD_TGID) { + unsigned int tgid = trace_find_tgid(entry->pid); + + if (!tgid) + trace_seq_printf(s, "(-----) "); + else + trace_seq_printf(s, "(%5d) ", tgid); + } + + trace_seq_printf(s, "[%03d] ", iter->cpu); + + if (tr->trace_flags & TRACE_ITER_IRQ_INFO) + trace_print_lat_fmt(s, entry); + + if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) { + t = ns2usecs(iter->ts); + usec_rem = do_div(t, USEC_PER_SEC); + secs = (unsigned long)t; + trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem); + } else + trace_seq_printf(s, " %12llu: ", iter->ts); + + return !trace_seq_has_overflowed(s); +} + +int trace_print_lat_context(struct trace_iterator *iter) +{ + struct trace_array *tr = iter->tr; + /* trace_find_next_entry will reset ent_size */ + int ent_size = iter->ent_size; + struct trace_seq *s = &iter->seq; + u64 next_ts; + struct trace_entry *entry = iter->ent, + *next_entry = trace_find_next_entry(iter, NULL, + &next_ts); + unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE); + + /* Restore the original ent_size */ + iter->ent_size = ent_size; + + if (!next_entry) + next_ts = iter->ts; + + if (verbose) { + char comm[TASK_COMM_LEN]; + + trace_find_cmdline(entry->pid, comm); + + trace_seq_printf( + s, "%16s %5d %3d %d %08x %08lx ", + comm, entry->pid, iter->cpu, entry->flags, + entry->preempt_count, iter->idx); + } else { + lat_print_generic(s, entry, iter->cpu); + } + + lat_print_timestamp(iter, next_ts); + + return !trace_seq_has_overflowed(s); +} + +/** + * ftrace_find_event - find a registered event + * @type: the type of event to look for + * + * Returns an event of type @type otherwise NULL + * Called with trace_event_read_lock() held. + */ +struct trace_event *ftrace_find_event(int type) +{ + struct trace_event *event; + unsigned key; + + key = type & (EVENT_HASHSIZE - 1); + + hlist_for_each_entry(event, &event_hash[key], node) { + if (event->type == type) + return event; + } + + return NULL; +} + +static LIST_HEAD(ftrace_event_list); + +static int trace_search_list(struct list_head **list) +{ + struct trace_event *e; + int last = __TRACE_LAST_TYPE; + + if (list_empty(&ftrace_event_list)) { + *list = &ftrace_event_list; + return last + 1; + } + + /* + * We used up all possible max events, + * lets see if somebody freed one. + */ + list_for_each_entry(e, &ftrace_event_list, list) { + if (e->type != last + 1) + break; + last++; + } + + /* Did we used up all 65 thousand events??? */ + if ((last + 1) > TRACE_EVENT_TYPE_MAX) + return 0; + + *list = &e->list; + return last + 1; +} + +void trace_event_read_lock(void) +{ + down_read(&trace_event_sem); +} + +void trace_event_read_unlock(void) +{ + up_read(&trace_event_sem); +} + +/** + * register_trace_event - register output for an event type + * @event: the event type to register + * + * Event types are stored in a hash and this hash is used to + * find a way to print an event. If the @event->type is set + * then it will use that type, otherwise it will assign a + * type to use. + * + * If you assign your own type, please make sure it is added + * to the trace_type enum in trace.h, to avoid collisions + * with the dynamic types. + * + * Returns the event type number or zero on error. + */ +int register_trace_event(struct trace_event *event) +{ + unsigned key; + int ret = 0; + + down_write(&trace_event_sem); + + if (WARN_ON(!event)) + goto out; + + if (WARN_ON(!event->funcs)) + goto out; + + INIT_LIST_HEAD(&event->list); + + if (!event->type) { + struct list_head *list = NULL; + + if (next_event_type > TRACE_EVENT_TYPE_MAX) { + + event->type = trace_search_list(&list); + if (!event->type) + goto out; + + } else { + + event->type = next_event_type++; + list = &ftrace_event_list; + } + + if (WARN_ON(ftrace_find_event(event->type))) + goto out; + + list_add_tail(&event->list, list); + + } else if (event->type > __TRACE_LAST_TYPE) { + printk(KERN_WARNING "Need to add type to trace.h\n"); + WARN_ON(1); + goto out; + } else { + /* Is this event already used */ + if (ftrace_find_event(event->type)) + goto out; + } + + if (event->funcs->trace == NULL) + event->funcs->trace = trace_nop_print; + if (event->funcs->raw == NULL) + event->funcs->raw = trace_nop_print; + if (event->funcs->hex == NULL) + event->funcs->hex = trace_nop_print; + if (event->funcs->binary == NULL) + event->funcs->binary = trace_nop_print; + + key = event->type & (EVENT_HASHSIZE - 1); + + hlist_add_head(&event->node, &event_hash[key]); + + ret = event->type; + out: + up_write(&trace_event_sem); + + return ret; +} +EXPORT_SYMBOL_GPL(register_trace_event); + +/* + * Used by module code with the trace_event_sem held for write. + */ +int __unregister_trace_event(struct trace_event *event) +{ + hlist_del(&event->node); + list_del(&event->list); + return 0; +} + +/** + * unregister_trace_event - remove a no longer used event + * @event: the event to remove + */ +int unregister_trace_event(struct trace_event *event) +{ + down_write(&trace_event_sem); + __unregister_trace_event(event); + up_write(&trace_event_sem); + + return 0; +} +EXPORT_SYMBOL_GPL(unregister_trace_event); + +/* + * Standard events + */ + +enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags, + struct trace_event *event) +{ + trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type); + + return trace_handle_return(&iter->seq); +} + +/* TRACE_FN */ +static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags, + struct trace_event *event) +{ + struct ftrace_entry *field; + struct trace_seq *s = &iter->seq; + + trace_assign_type(field, iter->ent); + + seq_print_ip_sym(s, field->ip, flags); + + if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) { + trace_seq_puts(s, " <-"); + seq_print_ip_sym(s, field->parent_ip, flags); + } + + trace_seq_putc(s, '\n'); + + return trace_handle_return(s); +} + +static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags, + struct trace_event *event) +{ + struct ftrace_entry *field; + + trace_assign_type(field, iter->ent); + + trace_seq_printf(&iter->seq, "%lx %lx\n", + field->ip, + field->parent_ip); + + return trace_handle_return(&iter->seq); +} + +static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags, + struct trace_event *event) +{ + struct ftrace_entry *field; + struct trace_seq *s = &iter->seq; + + trace_assign_type(field, iter->ent); + + SEQ_PUT_HEX_FIELD(s, field->ip); + SEQ_PUT_HEX_FIELD(s, field->parent_ip); + + return trace_handle_return(s); +} + +static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags, + struct trace_event *event) +{ + struct ftrace_entry *field; + struct trace_seq *s = &iter->seq; + + trace_assign_type(field, iter->ent); + + SEQ_PUT_FIELD(s, field->ip); + SEQ_PUT_FIELD(s, field->parent_ip); + + return trace_handle_return(s); +} + +static struct trace_event_functions trace_fn_funcs = { + .trace = trace_fn_trace, + .raw = trace_fn_raw, + .hex = trace_fn_hex, + .binary = trace_fn_bin, +}; + +static struct trace_event trace_fn_event = { + .type = TRACE_FN, + .funcs = &trace_fn_funcs, +}; + +/* TRACE_CTX an TRACE_WAKE */ +static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter, + char *delim) +{ + struct ctx_switch_entry *field; + char comm[TASK_COMM_LEN]; + int S, T; + + + trace_assign_type(field, iter->ent); + + T = task_index_to_char(field->next_state); + S = task_index_to_char(field->prev_state); + trace_find_cmdline(field->next_pid, comm); + trace_seq_printf(&iter->seq, + " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n", + field->prev_pid, + field->prev_prio, + S, delim, + field->next_cpu, + field->next_pid, + field->next_prio, + T, comm); + + return trace_handle_return(&iter->seq); +} + +static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags, + struct trace_event *event) +{ + return trace_ctxwake_print(iter, "==>"); +} + +static enum print_line_t trace_wake_print(struct trace_iterator *iter, + int flags, struct trace_event *event) +{ + return trace_ctxwake_print(iter, " +"); +} + +static int trace_ctxwake_raw(struct trace_iterator *iter, char S) +{ + struct ctx_switch_entry *field; + int T; + + trace_assign_type(field, iter->ent); + + if (!S) + S = task_index_to_char(field->prev_state); + T = task_index_to_char(field->next_state); + trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n", + field->prev_pid, + field->prev_prio, + S, + field->next_cpu, + field->next_pid, + field->next_prio, + T); + + return trace_handle_return(&iter->seq); +} + +static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags, + struct trace_event *event) +{ + return trace_ctxwake_raw(iter, 0); +} + +static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags, + struct trace_event *event) +{ + return trace_ctxwake_raw(iter, '+'); +} + + +static int trace_ctxwake_hex(struct trace_iterator *iter, char S) +{ + struct ctx_switch_entry *field; + struct trace_seq *s = &iter->seq; + int T; + + trace_assign_type(field, iter->ent); + + if (!S) + S = task_index_to_char(field->prev_state); + T = task_index_to_char(field->next_state); + + SEQ_PUT_HEX_FIELD(s, field->prev_pid); + SEQ_PUT_HEX_FIELD(s, field->prev_prio); + SEQ_PUT_HEX_FIELD(s, S); + SEQ_PUT_HEX_FIELD(s, field->next_cpu); + SEQ_PUT_HEX_FIELD(s, field->next_pid); + SEQ_PUT_HEX_FIELD(s, field->next_prio); + SEQ_PUT_HEX_FIELD(s, T); + + return trace_handle_return(s); +} + +static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags, + struct trace_event *event) +{ + return trace_ctxwake_hex(iter, 0); +} + +static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags, + struct trace_event *event) +{ + return trace_ctxwake_hex(iter, '+'); +} + +static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter, + int flags, struct trace_event *event) +{ + struct ctx_switch_entry *field; + struct trace_seq *s = &iter->seq; + + trace_assign_type(field, iter->ent); + + SEQ_PUT_FIELD(s, field->prev_pid); + SEQ_PUT_FIELD(s, field->prev_prio); + SEQ_PUT_FIELD(s, field->prev_state); + SEQ_PUT_FIELD(s, field->next_cpu); + SEQ_PUT_FIELD(s, field->next_pid); + SEQ_PUT_FIELD(s, field->next_prio); + SEQ_PUT_FIELD(s, field->next_state); + + return trace_handle_return(s); +} + +static struct trace_event_functions trace_ctx_funcs = { + .trace = trace_ctx_print, + .raw = trace_ctx_raw, + .hex = trace_ctx_hex, + .binary = trace_ctxwake_bin, +}; + +static struct trace_event trace_ctx_event = { + .type = TRACE_CTX, + .funcs = &trace_ctx_funcs, +}; + +static struct trace_event_functions trace_wake_funcs = { + .trace = trace_wake_print, + .raw = trace_wake_raw, + .hex = trace_wake_hex, + .binary = trace_ctxwake_bin, +}; + +static struct trace_event trace_wake_event = { + .type = TRACE_WAKE, + .funcs = &trace_wake_funcs, +}; + +/* TRACE_STACK */ + +static enum print_line_t trace_stack_print(struct trace_iterator *iter, + int flags, struct trace_event *event) +{ + struct stack_entry *field; + struct trace_seq *s = &iter->seq; + unsigned long *p; + unsigned long *end; + + trace_assign_type(field, iter->ent); + end = (unsigned long *)((long)iter->ent + iter->ent_size); + + trace_seq_puts(s, "<stack trace>\n"); + + for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) { + + if (trace_seq_has_overflowed(s)) + break; + + trace_seq_puts(s, " => "); + seq_print_ip_sym(s, *p, flags); + trace_seq_putc(s, '\n'); + } + + return trace_handle_return(s); +} + +static struct trace_event_functions trace_stack_funcs = { + .trace = trace_stack_print, +}; + +static struct trace_event trace_stack_event = { + .type = TRACE_STACK, + .funcs = &trace_stack_funcs, +}; + +/* TRACE_USER_STACK */ +static enum print_line_t trace_user_stack_print(struct trace_iterator *iter, + int flags, struct trace_event *event) +{ + struct trace_array *tr = iter->tr; + struct userstack_entry *field; + struct trace_seq *s = &iter->seq; + struct mm_struct *mm = NULL; + unsigned int i; + + trace_assign_type(field, iter->ent); + + trace_seq_puts(s, "<user stack trace>\n"); + + if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) { + struct task_struct *task; + /* + * we do the lookup on the thread group leader, + * since individual threads might have already quit! + */ + rcu_read_lock(); + task = find_task_by_vpid(field->tgid); + if (task) + mm = get_task_mm(task); + rcu_read_unlock(); + } + + for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { + unsigned long ip = field->caller[i]; + + if (ip == ULONG_MAX || trace_seq_has_overflowed(s)) + break; + + trace_seq_puts(s, " => "); + + if (!ip) { + trace_seq_puts(s, "??"); + trace_seq_putc(s, '\n'); + continue; + } + + seq_print_user_ip(s, mm, ip, flags); + trace_seq_putc(s, '\n'); + } + + if (mm) + mmput(mm); + + return trace_handle_return(s); +} + +static struct trace_event_functions trace_user_stack_funcs = { + .trace = trace_user_stack_print, +}; + +static struct trace_event trace_user_stack_event = { + .type = TRACE_USER_STACK, + .funcs = &trace_user_stack_funcs, +}; + +/* TRACE_HWLAT */ +static enum print_line_t +trace_hwlat_print(struct trace_iterator *iter, int flags, + struct trace_event *event) +{ + struct trace_entry *entry = iter->ent; + struct trace_seq *s = &iter->seq; + struct hwlat_entry *field; + + trace_assign_type(field, entry); + + trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld", + field->seqnum, + field->duration, + field->outer_duration, + (long long)field->timestamp.tv_sec, + field->timestamp.tv_nsec); + + if (field->nmi_count) { + /* + * The generic sched_clock() is not NMI safe, thus + * we only record the count and not the time. + */ + if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK)) + trace_seq_printf(s, " nmi-total:%llu", + field->nmi_total_ts); + trace_seq_printf(s, " nmi-count:%u", + field->nmi_count); + } + + trace_seq_putc(s, '\n'); + + return trace_handle_return(s); +} + + +static enum print_line_t +trace_hwlat_raw(struct trace_iterator *iter, int flags, + struct trace_event *event) +{ + struct hwlat_entry *field; + struct trace_seq *s = &iter->seq; + + trace_assign_type(field, iter->ent); + + trace_seq_printf(s, "%llu %lld %lld %09ld %u\n", + field->duration, + field->outer_duration, + (long long)field->timestamp.tv_sec, + field->timestamp.tv_nsec, + field->seqnum); + + return trace_handle_return(s); +} + +static struct trace_event_functions trace_hwlat_funcs = { + .trace = trace_hwlat_print, + .raw = trace_hwlat_raw, +}; + +static struct trace_event trace_hwlat_event = { + .type = TRACE_HWLAT, + .funcs = &trace_hwlat_funcs, +}; + +/* TRACE_BPUTS */ +static enum print_line_t +trace_bputs_print(struct trace_iterator *iter, int flags, + struct trace_event *event) +{ + struct trace_entry *entry = iter->ent; + struct trace_seq *s = &iter->seq; + struct bputs_entry *field; + + trace_assign_type(field, entry); + + seq_print_ip_sym(s, field->ip, flags); + trace_seq_puts(s, ": "); + trace_seq_puts(s, field->str); + + return trace_handle_return(s); +} + + +static enum print_line_t +trace_bputs_raw(struct trace_iterator *iter, int flags, + struct trace_event *event) +{ + struct bputs_entry *field; + struct trace_seq *s = &iter->seq; + + trace_assign_type(field, iter->ent); + + trace_seq_printf(s, ": %lx : ", field->ip); + trace_seq_puts(s, field->str); + + return trace_handle_return(s); +} + +static struct trace_event_functions trace_bputs_funcs = { + .trace = trace_bputs_print, + .raw = trace_bputs_raw, +}; + +static struct trace_event trace_bputs_event = { + .type = TRACE_BPUTS, + .funcs = &trace_bputs_funcs, +}; + +/* TRACE_BPRINT */ +static enum print_line_t +trace_bprint_print(struct trace_iterator *iter, int flags, + struct trace_event *event) +{ + struct trace_entry *entry = iter->ent; + struct trace_seq *s = &iter->seq; + struct bprint_entry *field; + + trace_assign_type(field, entry); + + seq_print_ip_sym(s, field->ip, flags); + trace_seq_puts(s, ": "); + trace_seq_bprintf(s, field->fmt, field->buf); + + return trace_handle_return(s); +} + + +static enum print_line_t +trace_bprint_raw(struct trace_iterator *iter, int flags, + struct trace_event *event) +{ + struct bprint_entry *field; + struct trace_seq *s = &iter->seq; + + trace_assign_type(field, iter->ent); + + trace_seq_printf(s, ": %lx : ", field->ip); + trace_seq_bprintf(s, field->fmt, field->buf); + + return trace_handle_return(s); +} + +static struct trace_event_functions trace_bprint_funcs = { + .trace = trace_bprint_print, + .raw = trace_bprint_raw, +}; + +static struct trace_event trace_bprint_event = { + .type = TRACE_BPRINT, + .funcs = &trace_bprint_funcs, +}; + +/* TRACE_PRINT */ +static enum print_line_t trace_print_print(struct trace_iterator *iter, + int flags, struct trace_event *event) +{ + struct print_entry *field; + struct trace_seq *s = &iter->seq; + + trace_assign_type(field, iter->ent); + + seq_print_ip_sym(s, field->ip, flags); + trace_seq_printf(s, ": %s", field->buf); + + return trace_handle_return(s); +} + +static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags, + struct trace_event *event) +{ + struct print_entry *field; + + trace_assign_type(field, iter->ent); + + trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf); + + return trace_handle_return(&iter->seq); +} + +static struct trace_event_functions trace_print_funcs = { + .trace = trace_print_print, + .raw = trace_print_raw, +}; + +static struct trace_event trace_print_event = { + .type = TRACE_PRINT, + .funcs = &trace_print_funcs, +}; + +static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags, + struct trace_event *event) +{ + struct raw_data_entry *field; + int i; + + trace_assign_type(field, iter->ent); + + trace_seq_printf(&iter->seq, "# %x buf:", field->id); + + for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++) + trace_seq_printf(&iter->seq, " %02x", + (unsigned char)field->buf[i]); + + trace_seq_putc(&iter->seq, '\n'); + + return trace_handle_return(&iter->seq); +} + +static struct trace_event_functions trace_raw_data_funcs = { + .trace = trace_raw_data, + .raw = trace_raw_data, +}; + +static struct trace_event trace_raw_data_event = { + .type = TRACE_RAW_DATA, + .funcs = &trace_raw_data_funcs, +}; + + +static struct trace_event *events[] __initdata = { + &trace_fn_event, + &trace_ctx_event, + &trace_wake_event, + &trace_stack_event, + &trace_user_stack_event, + &trace_bputs_event, + &trace_bprint_event, + &trace_print_event, + &trace_hwlat_event, + &trace_raw_data_event, + NULL +}; + +__init static int init_events(void) +{ + struct trace_event *event; + int i, ret; + + for (i = 0; events[i]; i++) { + event = events[i]; + + ret = register_trace_event(event); + if (!ret) { + printk(KERN_WARNING "event %d failed to register\n", + event->type); + WARN_ON_ONCE(1); + } + } + + return 0; +} +early_initcall(init_events); |