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mmiotrace: handle TRACE_PRINT entries

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Also make trace_seq_print_cont() non-static, and add a newline if the
seq buffer can't hold all data.

Signed-off-by: Pekka Paalanen <pq@iki.fi>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Pekka Paalanen 2008-09-16 22:02:27 +03:00 committed by Ingo Molnar
parent 9e57fb35d7
commit fc5e27ae4b
3 changed files with 53 additions and 20 deletions
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31
kernel/trace/trace.c
View File

@ -199,23 +199,6 @@ unsigned long nsecs_to_usecs(unsigned long nsecs)
return nsecs / 1000;
}
/*
* trace_flag_type is an enumeration that holds different
* states when a trace occurs. These are:
* IRQS_OFF - interrupts were disabled
* NEED_RESCED - reschedule is requested
* HARDIRQ - inside an interrupt handler
* SOFTIRQ - inside a softirq handler
* CONT - multiple entries hold the trace item
*/
enum trace_flag_type {
TRACE_FLAG_IRQS_OFF = 0x01,
TRACE_FLAG_NEED_RESCHED = 0x02,
TRACE_FLAG_HARDIRQ = 0x04,
TRACE_FLAG_SOFTIRQ = 0x08,
TRACE_FLAG_CONT = 0x10,
};
/*
* TRACE_ITER_SYM_MASK masks the options in trace_flags that
* control the output of kernel symbols.
@ -1517,12 +1500,16 @@ lat_print_timestamp(struct trace_seq *s, unsigned long long abs_usecs,
static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
static void
trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter)
/*
* The message is supposed to contain an ending newline.
* If the printing stops prematurely, try to add a newline of our own.
*/
void trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter)
{
struct trace_array *tr = iter->tr;
struct trace_array_cpu *data = tr->data[iter->cpu];
struct trace_entry *ent;
bool ok = true;
ent = trace_entry_idx(tr, data, iter, iter->cpu);
if (!ent || ent->type != TRACE_CONT) {
@ -1531,10 +1518,14 @@ trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter)
}
do {
trace_seq_printf(s, "%s", ent->cont.buf);
if (ok)
ok = (trace_seq_printf(s, "%s", ent->cont.buf) > 0);
__trace_iterator_increment(iter, iter->cpu);
ent = trace_entry_idx(tr, data, iter, iter->cpu);
} while (ent && ent->type == TRACE_CONT);
if (!ok)
trace_seq_putc(s, '\n');
}
static int

19
kernel/trace/trace.h
View File

@ -71,6 +71,23 @@ struct print_entry {
char buf[];
};
/*
* trace_flag_type is an enumeration that holds different
* states when a trace occurs. These are:
* IRQS_OFF - interrupts were disabled
* NEED_RESCED - reschedule is requested
* HARDIRQ - inside an interrupt handler
* SOFTIRQ - inside a softirq handler
* CONT - multiple entries hold the trace item
*/
enum trace_flag_type {
TRACE_FLAG_IRQS_OFF = 0x01,
TRACE_FLAG_NEED_RESCHED = 0x02,
TRACE_FLAG_HARDIRQ = 0x04,
TRACE_FLAG_SOFTIRQ = 0x08,
TRACE_FLAG_CONT = 0x10,
};
/*
* The trace field - the most basic unit of tracing. This is what
* is printed in the end as a single line in the trace output, such as:
@ -330,6 +347,8 @@ extern int trace_selftest_startup_sysprof(struct tracer *trace,
extern void *head_page(struct trace_array_cpu *data);
extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...);
extern void trace_seq_print_cont(struct trace_seq *s,
struct trace_iterator *iter);
extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
size_t cnt);
extern long ns2usecs(cycle_t nsec);

23
kernel/trace/trace_mmiotrace.c
View File

@ -245,6 +245,27 @@ static int mmio_print_map(struct trace_iterator *iter)
return 0;
}
static int mmio_print_mark(struct trace_iterator *iter)
{
struct trace_entry *entry = iter->ent;
const char *msg = entry->field.print.buf;
struct trace_seq *s = &iter->seq;
unsigned long long t = ns2usecs(entry->field.t);
unsigned long usec_rem = do_div(t, 1000000ULL);
unsigned secs = (unsigned long)t;
int ret;
/* The trailing newline must be in the message. */
ret = trace_seq_printf(s, "MARK %lu.%06lu %s", secs, usec_rem, msg);
if (!ret)
return 0;
if (entry->field.flags & TRACE_FLAG_CONT)
trace_seq_print_cont(s, iter);
return 1;
}
/* return 0 to abort printing without consuming current entry in pipe mode */
static int mmio_print_line(struct trace_iterator *iter)
{
@ -253,6 +274,8 @@ static int mmio_print_line(struct trace_iterator *iter)
return mmio_print_rw(iter);
case TRACE_MMIO_MAP:
return mmio_print_map(iter);
case TRACE_PRINT:
return mmio_print_mark(iter);
default:
return 1; /* ignore unknown entries */
}