[mirror_ubuntu-zesty-kernel.git] / kernel / trace / trace_mmiotrace.c

/*
 * Memory mapped I/O tracing
 *
 * Copyright (C) 2008 Pekka Paalanen <pq@iki.fi>
 */

#define DEBUG 1

#include <linux/kernel.h>
#include <linux/mmiotrace.h>
#include <linux/pci.h>

#include "trace.h"

struct header_iter {
	struct pci_dev *dev;
};

static struct trace_array *mmio_trace_array;
static bool overrun_detected;

static void mmio_reset_data(struct trace_array *tr)
{
	int cpu;

	overrun_detected = false;
	tr->time_start = ftrace_now(tr->cpu);

	for_each_online_cpu(cpu)
		tracing_reset(tr, cpu);
}

static void mmio_trace_init(struct trace_array *tr)
{
	pr_debug("in %s\n", __func__);
	mmio_trace_array = tr;

	mmio_reset_data(tr);
	enable_mmiotrace();
}

static void mmio_trace_reset(struct trace_array *tr)
{
	pr_debug("in %s\n", __func__);

	disable_mmiotrace();
	mmio_reset_data(tr);
	mmio_trace_array = NULL;
}

static void mmio_trace_start(struct trace_array *tr)
{
	pr_debug("in %s\n", __func__);
	mmio_reset_data(tr);
}

static int mmio_print_pcidev(struct trace_seq *s, const struct pci_dev *dev)
{
	int ret = 0;
	int i;
	resource_size_t start, end;
	const struct pci_driver *drv = pci_dev_driver(dev);

	/* XXX: incomplete checks for trace_seq_printf() return value */
	ret += trace_seq_printf(s, "PCIDEV %02x%02x %04x%04x %x",
				dev->bus->number, dev->devfn,
				dev->vendor, dev->device, dev->irq);
	/*
	 * XXX: is pci_resource_to_user() appropriate, since we are
	 * supposed to interpret the __ioremap() phys_addr argument based on
	 * these printed values?
	 */
	for (i = 0; i < 7; i++) {
		pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
		ret += trace_seq_printf(s, " %llx",
			(unsigned long long)(start |
			(dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
	}
	for (i = 0; i < 7; i++) {
		pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
		ret += trace_seq_printf(s, " %llx",
			dev->resource[i].start < dev->resource[i].end ?
			(unsigned long long)(end - start) + 1 : 0);
	}
	if (drv)
		ret += trace_seq_printf(s, " %s\n", drv->name);
	else
		ret += trace_seq_printf(s, " \n");
	return ret;
}

static void destroy_header_iter(struct header_iter *hiter)
{
	if (!hiter)
		return;
	pci_dev_put(hiter->dev);
	kfree(hiter);
}

static void mmio_pipe_open(struct trace_iterator *iter)
{
	struct header_iter *hiter;
	struct trace_seq *s = &iter->seq;

	trace_seq_printf(s, "VERSION 20070824\n");

	hiter = kzalloc(sizeof(*hiter), GFP_KERNEL);
	if (!hiter)
		return;

	hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);
	iter->private = hiter;
}

/* XXX: This is not called when the pipe is closed! */
static void mmio_close(struct trace_iterator *iter)
{
	struct header_iter *hiter = iter->private;
	destroy_header_iter(hiter);
	iter->private = NULL;
}

static unsigned long count_overruns(struct trace_iterator *iter)
{
	int cpu;
	unsigned long cnt = 0;
/* FIXME: */
#if 0
	for_each_online_cpu(cpu) {
		cnt += iter->overrun[cpu];
		iter->overrun[cpu] = 0;
	}
#endif
	(void)cpu;
	return cnt;
}

static ssize_t mmio_read(struct trace_iterator *iter, struct file *filp,
				char __user *ubuf, size_t cnt, loff_t *ppos)
{
	ssize_t ret;
	struct header_iter *hiter = iter->private;
	struct trace_seq *s = &iter->seq;
	unsigned long n;

	n = count_overruns(iter);
	if (n) {
		/* XXX: This is later than where events were lost. */
		trace_seq_printf(s, "MARK 0.000000 Lost %lu events.\n", n);
		if (!overrun_detected)
			pr_warning("mmiotrace has lost events.\n");
		overrun_detected = true;
		goto print_out;
	}

	if (!hiter)
		return 0;

	mmio_print_pcidev(s, hiter->dev);
	hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, hiter->dev);

	if (!hiter->dev) {
		destroy_header_iter(hiter);
		iter->private = NULL;
	}

print_out:
	ret = trace_seq_to_user(s, ubuf, cnt);
	return (ret == -EBUSY) ? 0 : ret;
}

static enum print_line_t mmio_print_rw(struct trace_iterator *iter)
{
	struct trace_entry *entry = iter->ent;
	struct trace_mmiotrace_rw *field;
	struct mmiotrace_rw *rw;
	struct trace_seq *s	= &iter->seq;
	unsigned long long t	= ns2usecs(iter->ts);
	unsigned long usec_rem	= do_div(t, 1000000ULL);
	unsigned secs		= (unsigned long)t;
	int ret = 1;

	trace_assign_type(field, entry);
	rw = &field->rw;

	switch (rw->opcode) {
	case MMIO_READ:
		ret = trace_seq_printf(s,
			"R %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
			rw->width, secs, usec_rem, rw->map_id,
			(unsigned long long)rw->phys,
			rw->value, rw->pc, 0);
		break;
	case MMIO_WRITE:
		ret = trace_seq_printf(s,
			"W %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
			rw->width, secs, usec_rem, rw->map_id,
			(unsigned long long)rw->phys,
			rw->value, rw->pc, 0);
		break;
	case MMIO_UNKNOWN_OP:
		ret = trace_seq_printf(s,
			"UNKNOWN %lu.%06lu %d 0x%llx %02x,%02x,%02x 0x%lx %d\n",
			secs, usec_rem, rw->map_id,
			(unsigned long long)rw->phys,
			(rw->value >> 16) & 0xff, (rw->value >> 8) & 0xff,
			(rw->value >> 0) & 0xff, rw->pc, 0);
		break;
	default:
		ret = trace_seq_printf(s, "rw what?\n");
		break;
	}
	if (ret)
		return TRACE_TYPE_HANDLED;
	return TRACE_TYPE_PARTIAL_LINE;
}

static enum print_line_t mmio_print_map(struct trace_iterator *iter)
{
	struct trace_entry *entry = iter->ent;
	struct trace_mmiotrace_map *field;
	struct mmiotrace_map *m;
	struct trace_seq *s	= &iter->seq;
	unsigned long long t	= ns2usecs(iter->ts);
	unsigned long usec_rem	= do_div(t, 1000000ULL);
	unsigned secs		= (unsigned long)t;
	int ret;

	trace_assign_type(field, entry);
	m = &field->map;

	switch (m->opcode) {
	case MMIO_PROBE:
		ret = trace_seq_printf(s,
			"MAP %lu.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n",
			secs, usec_rem, m->map_id,
			(unsigned long long)m->phys, m->virt, m->len,
			0UL, 0);
		break;
	case MMIO_UNPROBE:
		ret = trace_seq_printf(s,
			"UNMAP %lu.%06lu %d 0x%lx %d\n",
			secs, usec_rem, m->map_id, 0UL, 0);
		break;
	default:
		ret = trace_seq_printf(s, "map what?\n");
		break;
	}
	if (ret)
		return TRACE_TYPE_HANDLED;
	return TRACE_TYPE_PARTIAL_LINE;
}

static enum print_line_t mmio_print_mark(struct trace_iterator *iter)
{
	struct trace_entry *entry = iter->ent;
	struct print_entry *print = (struct print_entry *)entry;
	const char *msg		= print->buf;
	struct trace_seq *s	= &iter->seq;
	unsigned long long t	= ns2usecs(iter->ts);
	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 TRACE_TYPE_PARTIAL_LINE;

	if (entry->flags & TRACE_FLAG_CONT)
		trace_seq_print_cont(s, iter);

	return TRACE_TYPE_HANDLED;
}

static enum print_line_t mmio_print_line(struct trace_iterator *iter)
{
	switch (iter->ent->type) {
	case TRACE_MMIO_RW:
		return mmio_print_rw(iter);
	case TRACE_MMIO_MAP:
		return mmio_print_map(iter);
	case TRACE_PRINT:
		return mmio_print_mark(iter);
	default:
		return TRACE_TYPE_HANDLED; /* ignore unknown entries */
	}
}

static struct tracer mmio_tracer __read_mostly =
{
	.name		= "mmiotrace",
	.init		= mmio_trace_init,
	.reset		= mmio_trace_reset,
	.start		= mmio_trace_start,
	.pipe_open	= mmio_pipe_open,
	.close		= mmio_close,
	.read		= mmio_read,
	.print_line	= mmio_print_line,
};

__init static int init_mmio_trace(void)
{
	return register_tracer(&mmio_tracer);
}
device_initcall(init_mmio_trace);

static void __trace_mmiotrace_rw(struct trace_array *tr,
				struct trace_array_cpu *data,
				struct mmiotrace_rw *rw)
{
	struct ring_buffer_event *event;
	struct trace_mmiotrace_rw *entry;
	unsigned long irq_flags;

	event	= ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
					   &irq_flags);
	if (!event)
		return;
	entry	= ring_buffer_event_data(event);
	tracing_generic_entry_update(&entry->ent, 0, preempt_count());
	entry->ent.type			= TRACE_MMIO_RW;
	entry->rw			= *rw;
	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);

	trace_wake_up();
}

void mmio_trace_rw(struct mmiotrace_rw *rw)
{
	struct trace_array *tr = mmio_trace_array;
	struct trace_array_cpu *data = tr->data[smp_processor_id()];
	__trace_mmiotrace_rw(tr, data, rw);
}

static void __trace_mmiotrace_map(struct trace_array *tr,
				struct trace_array_cpu *data,
				struct mmiotrace_map *map)
{
	struct ring_buffer_event *event;
	struct trace_mmiotrace_map *entry;
	unsigned long irq_flags;

	event	= ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
					   &irq_flags);
	if (!event)
		return;
	entry	= ring_buffer_event_data(event);
	tracing_generic_entry_update(&entry->ent, 0, preempt_count());
	entry->ent.type			= TRACE_MMIO_MAP;
	entry->map			= *map;
	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);

	trace_wake_up();
}

void mmio_trace_mapping(struct mmiotrace_map *map)
{
	struct trace_array *tr = mmio_trace_array;
	struct trace_array_cpu *data;

	preempt_disable();
	data = tr->data[smp_processor_id()];
	__trace_mmiotrace_map(tr, data, map);
	preempt_enable();
}

int mmio_trace_printk(const char *fmt, va_list args)
{
	return trace_vprintk(0, fmt, args);
}
Commit	Line	Data
f984b51e PP	1	/*
	2	* Memory mapped I/O tracing
	3	*
	4	* Copyright (C) 2008 Pekka Paalanen <pq@iki.fi>
	5	*/
	6
	7	#define DEBUG 1
	8
	9	#include <linux/kernel.h>
	10	#include <linux/mmiotrace.h>
13829537	11	#include <linux/pci.h>
f984b51e PP	12
	13	#include "trace.h"
	14
d0a7e8ca PP	15	struct header_iter {
	16	struct pci_dev *dev;
	17	};
	18
f984b51e	19	static struct trace_array *mmio_trace_array;
2039238b	20	static bool overrun_detected;
f984b51e	21
bd8ac686 PP	22	static void mmio_reset_data(struct trace_array *tr)
	23	{
	24	int cpu;
	25
2039238b	26	overrun_detected = false;
bd8ac686 PP	27	tr->time_start = ftrace_now(tr->cpu);
	28
	29	for_each_online_cpu(cpu)
3928a8a2	30	tracing_reset(tr, cpu);
bd8ac686	31	}
f984b51e PP	32
	33	static void mmio_trace_init(struct trace_array *tr)
	34	{
	35	pr_debug("in %s\n", __func__);
	36	mmio_trace_array = tr;
c76f0694 SR	37
	38	mmio_reset_data(tr);
	39	enable_mmiotrace();
f984b51e PP	40	}
	41
	42	static void mmio_trace_reset(struct trace_array *tr)
	43	{
	44	pr_debug("in %s\n", __func__);
c76f0694 SR	45
c76f0694 SR	46	disable_mmiotrace();
bd8ac686 PP	47	mmio_reset_data(tr);
bd8ac686 PP	48	mmio_trace_array = NULL;
f984b51e PP	49	}
f984b51e PP	50
bbf5b1a0	51	static void mmio_trace_start(struct trace_array *tr)
f984b51e PP	52	{
f984b51e PP	53	pr_debug("in %s\n", __func__);
bbf5b1a0	54	mmio_reset_data(tr);
bd8ac686 PP	55	}
bd8ac686 PP	56
13829537 PP	57	static int mmio_print_pcidev(struct trace_seq s, const struct pci_dev dev)
	58	{
	59	int ret = 0;
	60	int i;
	61	resource_size_t start, end;
	62	const struct pci_driver *drv = pci_dev_driver(dev);
	63
	64	/* XXX: incomplete checks for trace_seq_printf() return value */
	65	ret += trace_seq_printf(s, "PCIDEV %02x%02x %04x%04x %x",
	66	dev->bus->number, dev->devfn,
	67	dev->vendor, dev->device, dev->irq);
	68	/*
	69	* XXX: is pci_resource_to_user() appropriate, since we are
	70	* supposed to interpret the __ioremap() phys_addr argument based on
	71	* these printed values?
	72	*/
	73	for (i = 0; i < 7; i++) {
	74	pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
	75	ret += trace_seq_printf(s, " %llx",
	76	(unsigned long long)(start \|
	77	(dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
	78	}
	79	for (i = 0; i < 7; i++) {
	80	pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
	81	ret += trace_seq_printf(s, " %llx",
	82	dev->resource[i].start < dev->resource[i].end ?
	83	(unsigned long long)(end - start) + 1 : 0);
	84	}
	85	if (drv)
	86	ret += trace_seq_printf(s, " %s\n", drv->name);
	87	else
	88	ret += trace_seq_printf(s, " \n");
	89	return ret;
	90	}
	91
d0a7e8ca PP	92	static void destroy_header_iter(struct header_iter *hiter)
	93	{
	94	if (!hiter)
	95	return;
	96	pci_dev_put(hiter->dev);
	97	kfree(hiter);
	98	}
	99
	100	static void mmio_pipe_open(struct trace_iterator *iter)
bd8ac686	101	{
d0a7e8ca	102	struct header_iter *hiter;
bd8ac686	103	struct trace_seq *s = &iter->seq;
13829537 PP	104
	105	trace_seq_printf(s, "VERSION 20070824\n");
	106
d0a7e8ca PP	107	hiter = kzalloc(sizeof(*hiter), GFP_KERNEL);
	108	if (!hiter)
	109	return;
	110
	111	hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);
	112	iter->private = hiter;
	113	}
	114
	115	/* XXX: This is not called when the pipe is closed! */
	116	static void mmio_close(struct trace_iterator *iter)
	117	{
	118	struct header_iter *hiter = iter->private;
	119	destroy_header_iter(hiter);
	120	iter->private = NULL;
	121	}
	122
2039238b PP	123	static unsigned long count_overruns(struct trace_iterator *iter)
	124	{
	125	int cpu;
	126	unsigned long cnt = 0;
3928a8a2 SR	127	/* FIXME: */
3928a8a2 SR	128	#if 0
2039238b PP	129	for_each_online_cpu(cpu) {
	130	cnt += iter->overrun[cpu];
	131	iter->overrun[cpu] = 0;
	132	}
3928a8a2 SR	133	#endif
3928a8a2 SR	134	(void)cpu;
2039238b PP	135	return cnt;
	136	}
	137
d0a7e8ca PP	138	static ssize_t mmio_read(struct trace_iterator iter, struct file filp,
	139	char __user ubuf, size_t cnt, loff_t ppos)
	140	{
	141	ssize_t ret;
	142	struct header_iter *hiter = iter->private;
	143	struct trace_seq *s = &iter->seq;
2039238b PP	144	unsigned long n;
	145
	146	n = count_overruns(iter);
	147	if (n) {
	148	/* XXX: This is later than where events were lost. */
	149	trace_seq_printf(s, "MARK 0.000000 Lost %lu events.\n", n);
	150	if (!overrun_detected)
	151	pr_warning("mmiotrace has lost events.\n");
	152	overrun_detected = true;
	153	goto print_out;
	154	}
d0a7e8ca PP	155
	156	if (!hiter)
	157	return 0;
	158
	159	mmio_print_pcidev(s, hiter->dev);
	160	hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, hiter->dev);
	161
	162	if (!hiter->dev) {
	163	destroy_header_iter(hiter);
	164	iter->private = NULL;
	165	}
	166
2039238b	167	print_out:
d0a7e8ca PP	168	ret = trace_seq_to_user(s, ubuf, cnt);
d0a7e8ca PP	169	return (ret == -EBUSY) ? 0 : ret;
bd8ac686 PP	170	}
bd8ac686 PP	171
07f4e4f7	172	static enum print_line_t mmio_print_rw(struct trace_iterator *iter)
bd8ac686 PP	173	{
bd8ac686 PP	174	struct trace_entry *entry = iter->ent;
7104f300 SR	175	struct trace_mmiotrace_rw *field;
7104f300 SR	176	struct mmiotrace_rw *rw;
bd8ac686	177	struct trace_seq *s = &iter->seq;
3928a8a2	178	unsigned long long t = ns2usecs(iter->ts);
bd8ac686 PP	179	unsigned long usec_rem = do_div(t, 1000000ULL);
	180	unsigned secs = (unsigned long)t;
	181	int ret = 1;
	182
7104f300 SR	183	trace_assign_type(field, entry);
	184	rw = &field->rw;
	185
777e208d	186	switch (rw->opcode) {
bd8ac686 PP	187	case MMIO_READ:
bd8ac686 PP	188	ret = trace_seq_printf(s,
dee310d0 PP	189	"R %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
	190	rw->width, secs, usec_rem, rw->map_id,
	191	(unsigned long long)rw->phys,
736ca61f	192	rw->value, rw->pc, 0);
bd8ac686 PP	193	break;
	194	case MMIO_WRITE:
	195	ret = trace_seq_printf(s,
dee310d0 PP	196	"W %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
	197	rw->width, secs, usec_rem, rw->map_id,
	198	(unsigned long long)rw->phys,
736ca61f	199	rw->value, rw->pc, 0);
bd8ac686 PP	200	break;
	201	case MMIO_UNKNOWN_OP:
	202	ret = trace_seq_printf(s,
dee310d0 PP	203	"UNKNOWN %lu.%06lu %d 0x%llx %02x,%02x,%02x 0x%lx %d\n",
	204	secs, usec_rem, rw->map_id,
	205	(unsigned long long)rw->phys,
bd8ac686	206	(rw->value >> 16) & 0xff, (rw->value >> 8) & 0xff,
736ca61f	207	(rw->value >> 0) & 0xff, rw->pc, 0);
bd8ac686 PP	208	break;
	209	default:
	210	ret = trace_seq_printf(s, "rw what?\n");
	211	break;
	212	}
	213	if (ret)
07f4e4f7 FW	214	return TRACE_TYPE_HANDLED;
07f4e4f7 FW	215	return TRACE_TYPE_PARTIAL_LINE;
bd8ac686 PP	216	}
bd8ac686 PP	217
07f4e4f7	218	static enum print_line_t mmio_print_map(struct trace_iterator *iter)
bd8ac686 PP	219	{
bd8ac686 PP	220	struct trace_entry *entry = iter->ent;
7104f300 SR	221	struct trace_mmiotrace_map *field;
7104f300 SR	222	struct mmiotrace_map *m;
bd8ac686	223	struct trace_seq *s = &iter->seq;
3928a8a2	224	unsigned long long t = ns2usecs(iter->ts);
bd8ac686 PP	225	unsigned long usec_rem = do_div(t, 1000000ULL);
bd8ac686 PP	226	unsigned secs = (unsigned long)t;
07f4e4f7	227	int ret;
bd8ac686	228
7104f300 SR	229	trace_assign_type(field, entry);
	230	m = &field->map;
	231
777e208d	232	switch (m->opcode) {
bd8ac686 PP	233	case MMIO_PROBE:
bd8ac686 PP	234	ret = trace_seq_printf(s,
dee310d0 PP	235	"MAP %lu.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n",
	236	secs, usec_rem, m->map_id,
	237	(unsigned long long)m->phys, m->virt, m->len,
e0fd5c2f	238	0UL, 0);
bd8ac686 PP	239	break;
	240	case MMIO_UNPROBE:
	241	ret = trace_seq_printf(s,
	242	"UNMAP %lu.%06lu %d 0x%lx %d\n",
e0fd5c2f	243	secs, usec_rem, m->map_id, 0UL, 0);
bd8ac686 PP	244	break;
	245	default:
	246	ret = trace_seq_printf(s, "map what?\n");
	247	break;
	248	}
	249	if (ret)
07f4e4f7 FW	250	return TRACE_TYPE_HANDLED;
07f4e4f7 FW	251	return TRACE_TYPE_PARTIAL_LINE;
bd8ac686 PP	252	}
bd8ac686 PP	253
07f4e4f7	254	static enum print_line_t mmio_print_mark(struct trace_iterator *iter)
fc5e27ae PP	255	{
fc5e27ae PP	256	struct trace_entry *entry = iter->ent;
777e208d SR	257	struct print_entry print = (struct print_entry )entry;
777e208d SR	258	const char *msg = print->buf;
fc5e27ae	259	struct trace_seq *s = &iter->seq;
3928a8a2	260	unsigned long long t = ns2usecs(iter->ts);
fc5e27ae PP	261	unsigned long usec_rem = do_div(t, 1000000ULL);
	262	unsigned secs = (unsigned long)t;
	263	int ret;
	264
	265	/* The trailing newline must be in the message. */
	266	ret = trace_seq_printf(s, "MARK %lu.%06lu %s", secs, usec_rem, msg);
	267	if (!ret)
07f4e4f7	268	return TRACE_TYPE_PARTIAL_LINE;
fc5e27ae	269
777e208d	270	if (entry->flags & TRACE_FLAG_CONT)
fc5e27ae PP	271	trace_seq_print_cont(s, iter);
fc5e27ae PP	272
07f4e4f7	273	return TRACE_TYPE_HANDLED;
fc5e27ae PP	274	}
fc5e27ae PP	275
07f4e4f7	276	static enum print_line_t mmio_print_line(struct trace_iterator *iter)
bd8ac686 PP	277	{
	278	switch (iter->ent->type) {
	279	case TRACE_MMIO_RW:
	280	return mmio_print_rw(iter);
	281	case TRACE_MMIO_MAP:
	282	return mmio_print_map(iter);
fc5e27ae PP	283	case TRACE_PRINT:
fc5e27ae PP	284	return mmio_print_mark(iter);
bd8ac686	285	default:
07f4e4f7	286	return TRACE_TYPE_HANDLED; /* ignore unknown entries */
bd8ac686	287	}
f984b51e PP	288	}
	289
	290	static struct tracer mmio_tracer __read_mostly =
	291	{
	292	.name = "mmiotrace",
	293	.init = mmio_trace_init,
	294	.reset = mmio_trace_reset,
bbf5b1a0	295	.start = mmio_trace_start,
d0a7e8ca PP	296	.pipe_open = mmio_pipe_open,
	297	.close = mmio_close,
	298	.read = mmio_read,
bd8ac686	299	.print_line = mmio_print_line,
f984b51e PP	300	};
	301
	302	__init static int init_mmio_trace(void)
	303	{
f984b51e PP	304	return register_tracer(&mmio_tracer);
	305	}
	306	device_initcall(init_mmio_trace);
	307
45dcd8b8 PP	308	static void __trace_mmiotrace_rw(struct trace_array *tr,
	309	struct trace_array_cpu *data,
	310	struct mmiotrace_rw *rw)
	311	{
3928a8a2	312	struct ring_buffer_event *event;
777e208d	313	struct trace_mmiotrace_rw *entry;
45dcd8b8 PP	314	unsigned long irq_flags;
45dcd8b8 PP	315
3928a8a2 SR	316	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
	317	&irq_flags);
	318	if (!event)
	319	return;
	320	entry = ring_buffer_event_data(event);
38697053	321	tracing_generic_entry_update(&entry->ent, 0, preempt_count());
777e208d SR	322	entry->ent.type = TRACE_MMIO_RW;
777e208d SR	323	entry->rw = *rw;
3928a8a2	324	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
45dcd8b8 PP	325
	326	trace_wake_up();
	327	}
	328
bd8ac686	329	void mmio_trace_rw(struct mmiotrace_rw *rw)
f984b51e PP	330	{
	331	struct trace_array *tr = mmio_trace_array;
	332	struct trace_array_cpu *data = tr->data[smp_processor_id()];
bd8ac686 PP	333	__trace_mmiotrace_rw(tr, data, rw);
bd8ac686 PP	334	}
f984b51e	335
45dcd8b8 PP	336	static void __trace_mmiotrace_map(struct trace_array *tr,
	337	struct trace_array_cpu *data,
	338	struct mmiotrace_map *map)
	339	{
3928a8a2	340	struct ring_buffer_event *event;
777e208d	341	struct trace_mmiotrace_map *entry;
45dcd8b8 PP	342	unsigned long irq_flags;
45dcd8b8 PP	343
3928a8a2 SR	344	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
	345	&irq_flags);
	346	if (!event)
	347	return;
	348	entry = ring_buffer_event_data(event);
38697053	349	tracing_generic_entry_update(&entry->ent, 0, preempt_count());
777e208d SR	350	entry->ent.type = TRACE_MMIO_MAP;
777e208d SR	351	entry->map = *map;
3928a8a2	352	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
45dcd8b8 PP	353
	354	trace_wake_up();
	355	}
	356
bd8ac686 PP	357	void mmio_trace_mapping(struct mmiotrace_map *map)
	358	{
	359	struct trace_array *tr = mmio_trace_array;
	360	struct trace_array_cpu *data;
	361
	362	preempt_disable();
	363	data = tr->data[smp_processor_id()];
	364	__trace_mmiotrace_map(tr, data, map);
	365	preempt_enable();
f984b51e	366	}
9e57fb35 PP	367
	368	int mmio_trace_printk(const char *fmt, va_list args)
	369	{
	370	return trace_vprintk(0, fmt, args);
	371	}