v4.19.13 snapshot.
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
new file mode 100644
index 0000000..6e6cc64
--- /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);