[mirror_ubuntu-eoan-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 int mmio_trace_init(struct trace_array *tr)
{
	pr_debug("in %s\n", __func__);
	mmio_trace_array = tr;

	mmio_reset_data(tr);
	enable_mmiotrace();
	return 0;
}

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	32
1c80025a	33	static int mmio_trace_init(struct trace_array *tr)
f984b51e PP	34	{
	35	pr_debug("in %s\n", __func__);
	36	mmio_trace_array = tr;
c76f0694 SR	37
	38	mmio_reset_data(tr);
	39	enable_mmiotrace();
1c80025a	40	return 0;
f984b51e PP	41	}
	42
	43	static void mmio_trace_reset(struct trace_array *tr)
	44	{
	45	pr_debug("in %s\n", __func__);
c76f0694 SR	46
c76f0694 SR	47	disable_mmiotrace();
bd8ac686 PP	48	mmio_reset_data(tr);
bd8ac686 PP	49	mmio_trace_array = NULL;
f984b51e PP	50	}
f984b51e PP	51
bbf5b1a0	52	static void mmio_trace_start(struct trace_array *tr)
f984b51e PP	53	{
f984b51e PP	54	pr_debug("in %s\n", __func__);
bbf5b1a0	55	mmio_reset_data(tr);
bd8ac686 PP	56	}
bd8ac686 PP	57
13829537 PP	58	static int mmio_print_pcidev(struct trace_seq s, const struct pci_dev dev)
	59	{
	60	int ret = 0;
	61	int i;
	62	resource_size_t start, end;
	63	const struct pci_driver *drv = pci_dev_driver(dev);
	64
	65	/* XXX: incomplete checks for trace_seq_printf() return value */
	66	ret += trace_seq_printf(s, "PCIDEV %02x%02x %04x%04x %x",
	67	dev->bus->number, dev->devfn,
	68	dev->vendor, dev->device, dev->irq);
	69	/*
	70	* XXX: is pci_resource_to_user() appropriate, since we are
	71	* supposed to interpret the __ioremap() phys_addr argument based on
	72	* these printed values?
	73	*/
	74	for (i = 0; i < 7; i++) {
	75	pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
	76	ret += trace_seq_printf(s, " %llx",
	77	(unsigned long long)(start \|
	78	(dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
	79	}
	80	for (i = 0; i < 7; i++) {
	81	pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
	82	ret += trace_seq_printf(s, " %llx",
	83	dev->resource[i].start < dev->resource[i].end ?
	84	(unsigned long long)(end - start) + 1 : 0);
	85	}
	86	if (drv)
	87	ret += trace_seq_printf(s, " %s\n", drv->name);
	88	else
	89	ret += trace_seq_printf(s, " \n");
	90	return ret;
	91	}
	92
d0a7e8ca PP	93	static void destroy_header_iter(struct header_iter *hiter)
	94	{
	95	if (!hiter)
	96	return;
	97	pci_dev_put(hiter->dev);
	98	kfree(hiter);
	99	}
	100
	101	static void mmio_pipe_open(struct trace_iterator *iter)
bd8ac686	102	{
d0a7e8ca	103	struct header_iter *hiter;
bd8ac686	104	struct trace_seq *s = &iter->seq;
13829537 PP	105
	106	trace_seq_printf(s, "VERSION 20070824\n");
	107
d0a7e8ca PP	108	hiter = kzalloc(sizeof(*hiter), GFP_KERNEL);
	109	if (!hiter)
	110	return;
	111
	112	hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);
	113	iter->private = hiter;
	114	}
	115
	116	/* XXX: This is not called when the pipe is closed! */
	117	static void mmio_close(struct trace_iterator *iter)
	118	{
	119	struct header_iter *hiter = iter->private;
	120	destroy_header_iter(hiter);
	121	iter->private = NULL;
	122	}
	123
2039238b PP	124	static unsigned long count_overruns(struct trace_iterator *iter)
	125	{
	126	int cpu;
	127	unsigned long cnt = 0;
3928a8a2 SR	128	/* FIXME: */
3928a8a2 SR	129	#if 0
2039238b PP	130	for_each_online_cpu(cpu) {
	131	cnt += iter->overrun[cpu];
	132	iter->overrun[cpu] = 0;
	133	}
3928a8a2 SR	134	#endif
3928a8a2 SR	135	(void)cpu;
2039238b PP	136	return cnt;
	137	}
	138
d0a7e8ca PP	139	static ssize_t mmio_read(struct trace_iterator iter, struct file filp,
	140	char __user ubuf, size_t cnt, loff_t ppos)
	141	{
	142	ssize_t ret;
	143	struct header_iter *hiter = iter->private;
	144	struct trace_seq *s = &iter->seq;
2039238b PP	145	unsigned long n;
	146
	147	n = count_overruns(iter);
	148	if (n) {
	149	/* XXX: This is later than where events were lost. */
	150	trace_seq_printf(s, "MARK 0.000000 Lost %lu events.\n", n);
	151	if (!overrun_detected)
	152	pr_warning("mmiotrace has lost events.\n");
	153	overrun_detected = true;
	154	goto print_out;
	155	}
d0a7e8ca PP	156
	157	if (!hiter)
	158	return 0;
	159
	160	mmio_print_pcidev(s, hiter->dev);
	161	hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, hiter->dev);
	162
	163	if (!hiter->dev) {
	164	destroy_header_iter(hiter);
	165	iter->private = NULL;
	166	}
	167
2039238b	168	print_out:
d0a7e8ca PP	169	ret = trace_seq_to_user(s, ubuf, cnt);
d0a7e8ca PP	170	return (ret == -EBUSY) ? 0 : ret;
bd8ac686 PP	171	}
bd8ac686 PP	172
07f4e4f7	173	static enum print_line_t mmio_print_rw(struct trace_iterator *iter)
bd8ac686 PP	174	{
bd8ac686 PP	175	struct trace_entry *entry = iter->ent;
7104f300 SR	176	struct trace_mmiotrace_rw *field;
7104f300 SR	177	struct mmiotrace_rw *rw;
bd8ac686	178	struct trace_seq *s = &iter->seq;
3928a8a2	179	unsigned long long t = ns2usecs(iter->ts);
bd8ac686 PP	180	unsigned long usec_rem = do_div(t, 1000000ULL);
	181	unsigned secs = (unsigned long)t;
	182	int ret = 1;
	183
7104f300 SR	184	trace_assign_type(field, entry);
	185	rw = &field->rw;
	186
777e208d	187	switch (rw->opcode) {
bd8ac686 PP	188	case MMIO_READ:
bd8ac686 PP	189	ret = trace_seq_printf(s,
dee310d0 PP	190	"R %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
	191	rw->width, secs, usec_rem, rw->map_id,
	192	(unsigned long long)rw->phys,
736ca61f	193	rw->value, rw->pc, 0);
bd8ac686 PP	194	break;
	195	case MMIO_WRITE:
	196	ret = trace_seq_printf(s,
dee310d0 PP	197	"W %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
	198	rw->width, secs, usec_rem, rw->map_id,
	199	(unsigned long long)rw->phys,
736ca61f	200	rw->value, rw->pc, 0);
bd8ac686 PP	201	break;
	202	case MMIO_UNKNOWN_OP:
	203	ret = trace_seq_printf(s,
dee310d0 PP	204	"UNKNOWN %lu.%06lu %d 0x%llx %02x,%02x,%02x 0x%lx %d\n",
	205	secs, usec_rem, rw->map_id,
	206	(unsigned long long)rw->phys,
bd8ac686	207	(rw->value >> 16) & 0xff, (rw->value >> 8) & 0xff,
736ca61f	208	(rw->value >> 0) & 0xff, rw->pc, 0);
bd8ac686 PP	209	break;
	210	default:
	211	ret = trace_seq_printf(s, "rw what?\n");
	212	break;
	213	}
	214	if (ret)
07f4e4f7 FW	215	return TRACE_TYPE_HANDLED;
07f4e4f7 FW	216	return TRACE_TYPE_PARTIAL_LINE;
bd8ac686 PP	217	}
bd8ac686 PP	218
07f4e4f7	219	static enum print_line_t mmio_print_map(struct trace_iterator *iter)
bd8ac686 PP	220	{
bd8ac686 PP	221	struct trace_entry *entry = iter->ent;
7104f300 SR	222	struct trace_mmiotrace_map *field;
7104f300 SR	223	struct mmiotrace_map *m;
bd8ac686	224	struct trace_seq *s = &iter->seq;
3928a8a2	225	unsigned long long t = ns2usecs(iter->ts);
bd8ac686 PP	226	unsigned long usec_rem = do_div(t, 1000000ULL);
bd8ac686 PP	227	unsigned secs = (unsigned long)t;
07f4e4f7	228	int ret;
bd8ac686	229
7104f300 SR	230	trace_assign_type(field, entry);
	231	m = &field->map;
	232
777e208d	233	switch (m->opcode) {
bd8ac686 PP	234	case MMIO_PROBE:
bd8ac686 PP	235	ret = trace_seq_printf(s,
dee310d0 PP	236	"MAP %lu.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n",
	237	secs, usec_rem, m->map_id,
	238	(unsigned long long)m->phys, m->virt, m->len,
e0fd5c2f	239	0UL, 0);
bd8ac686 PP	240	break;
	241	case MMIO_UNPROBE:
	242	ret = trace_seq_printf(s,
	243	"UNMAP %lu.%06lu %d 0x%lx %d\n",
e0fd5c2f	244	secs, usec_rem, m->map_id, 0UL, 0);
bd8ac686 PP	245	break;
	246	default:
	247	ret = trace_seq_printf(s, "map what?\n");
	248	break;
	249	}
	250	if (ret)
07f4e4f7 FW	251	return TRACE_TYPE_HANDLED;
07f4e4f7 FW	252	return TRACE_TYPE_PARTIAL_LINE;
bd8ac686 PP	253	}
bd8ac686 PP	254
07f4e4f7	255	static enum print_line_t mmio_print_mark(struct trace_iterator *iter)
fc5e27ae PP	256	{
fc5e27ae PP	257	struct trace_entry *entry = iter->ent;
777e208d SR	258	struct print_entry print = (struct print_entry )entry;
777e208d SR	259	const char *msg = print->buf;
fc5e27ae	260	struct trace_seq *s = &iter->seq;
3928a8a2	261	unsigned long long t = ns2usecs(iter->ts);
fc5e27ae PP	262	unsigned long usec_rem = do_div(t, 1000000ULL);
	263	unsigned secs = (unsigned long)t;
	264	int ret;
	265
	266	/* The trailing newline must be in the message. */
	267	ret = trace_seq_printf(s, "MARK %lu.%06lu %s", secs, usec_rem, msg);
	268	if (!ret)
07f4e4f7	269	return TRACE_TYPE_PARTIAL_LINE;
fc5e27ae	270
777e208d	271	if (entry->flags & TRACE_FLAG_CONT)
fc5e27ae PP	272	trace_seq_print_cont(s, iter);
fc5e27ae PP	273
07f4e4f7	274	return TRACE_TYPE_HANDLED;
fc5e27ae PP	275	}
fc5e27ae PP	276
07f4e4f7	277	static enum print_line_t mmio_print_line(struct trace_iterator *iter)
bd8ac686 PP	278	{
	279	switch (iter->ent->type) {
	280	case TRACE_MMIO_RW:
	281	return mmio_print_rw(iter);
	282	case TRACE_MMIO_MAP:
	283	return mmio_print_map(iter);
fc5e27ae PP	284	case TRACE_PRINT:
fc5e27ae PP	285	return mmio_print_mark(iter);
bd8ac686	286	default:
07f4e4f7	287	return TRACE_TYPE_HANDLED; /* ignore unknown entries */
bd8ac686	288	}
f984b51e PP	289	}
	290
	291	static struct tracer mmio_tracer __read_mostly =
	292	{
	293	.name = "mmiotrace",
	294	.init = mmio_trace_init,
	295	.reset = mmio_trace_reset,
bbf5b1a0	296	.start = mmio_trace_start,
d0a7e8ca PP	297	.pipe_open = mmio_pipe_open,
	298	.close = mmio_close,
	299	.read = mmio_read,
bd8ac686	300	.print_line = mmio_print_line,
f984b51e PP	301	};
	302
	303	__init static int init_mmio_trace(void)
	304	{
f984b51e PP	305	return register_tracer(&mmio_tracer);
	306	}
	307	device_initcall(init_mmio_trace);
	308
45dcd8b8 PP	309	static void __trace_mmiotrace_rw(struct trace_array *tr,
	310	struct trace_array_cpu *data,
	311	struct mmiotrace_rw *rw)
	312	{
3928a8a2	313	struct ring_buffer_event *event;
777e208d	314	struct trace_mmiotrace_rw *entry;
45dcd8b8 PP	315	unsigned long irq_flags;
45dcd8b8 PP	316
3928a8a2 SR	317	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
	318	&irq_flags);
	319	if (!event)
	320	return;
	321	entry = ring_buffer_event_data(event);
38697053	322	tracing_generic_entry_update(&entry->ent, 0, preempt_count());
777e208d SR	323	entry->ent.type = TRACE_MMIO_RW;
777e208d SR	324	entry->rw = *rw;
3928a8a2	325	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
45dcd8b8 PP	326
	327	trace_wake_up();
	328	}
	329
bd8ac686	330	void mmio_trace_rw(struct mmiotrace_rw *rw)
f984b51e PP	331	{
	332	struct trace_array *tr = mmio_trace_array;
	333	struct trace_array_cpu *data = tr->data[smp_processor_id()];
bd8ac686 PP	334	__trace_mmiotrace_rw(tr, data, rw);
bd8ac686 PP	335	}
f984b51e	336
45dcd8b8 PP	337	static void __trace_mmiotrace_map(struct trace_array *tr,
	338	struct trace_array_cpu *data,
	339	struct mmiotrace_map *map)
	340	{
3928a8a2	341	struct ring_buffer_event *event;
777e208d	342	struct trace_mmiotrace_map *entry;
45dcd8b8 PP	343	unsigned long irq_flags;
45dcd8b8 PP	344
3928a8a2 SR	345	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
	346	&irq_flags);
	347	if (!event)
	348	return;
	349	entry = ring_buffer_event_data(event);
38697053	350	tracing_generic_entry_update(&entry->ent, 0, preempt_count());
777e208d SR	351	entry->ent.type = TRACE_MMIO_MAP;
777e208d SR	352	entry->map = *map;
3928a8a2	353	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
45dcd8b8 PP	354
	355	trace_wake_up();
	356	}
	357
bd8ac686 PP	358	void mmio_trace_mapping(struct mmiotrace_map *map)
	359	{
	360	struct trace_array *tr = mmio_trace_array;
	361	struct trace_array_cpu *data;
	362
	363	preempt_disable();
	364	data = tr->data[smp_processor_id()];
	365	__trace_mmiotrace_map(tr, data, map);
	366	preempt_enable();
f984b51e	367	}
9e57fb35 PP	368
	369	int mmio_trace_printk(const char *fmt, va_list args)
	370	{
	371	return trace_vprintk(0, fmt, args);
	372	}