[linux-2.6-block.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 unsigned long prev_overruns;

static void mmio_reset_data(struct trace_array *tr)
{
	overrun_detected = false;
	prev_overruns = 0;

	tracing_reset_online_cpus(tr);
}

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)
{
	unsigned long cnt = 0;
	unsigned long over = ring_buffer_overruns(iter->tr->buffer);

	if (over > prev_overruns)
		cnt = over - prev_overruns;
	prev_overruns = over;
	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, -1, 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;
7ee1768d	21	static unsigned long prev_overruns;
f984b51e	22
bd8ac686 PP	23	static void mmio_reset_data(struct trace_array *tr)
bd8ac686 PP	24	{
2039238b	25	overrun_detected = false;
7ee1768d	26	prev_overruns = 0;
bd8ac686	27
213cc060	28	tracing_reset_online_cpus(tr);
bd8ac686	29	}
f984b51e	30
1c80025a	31	static int mmio_trace_init(struct trace_array *tr)
f984b51e PP	32	{
	33	pr_debug("in %s\n", __func__);
	34	mmio_trace_array = tr;
c76f0694 SR	35
	36	mmio_reset_data(tr);
	37	enable_mmiotrace();
1c80025a	38	return 0;
f984b51e PP	39	}
	40
	41	static void mmio_trace_reset(struct trace_array *tr)
	42	{
	43	pr_debug("in %s\n", __func__);
c76f0694 SR	44
c76f0694 SR	45	disable_mmiotrace();
bd8ac686 PP	46	mmio_reset_data(tr);
bd8ac686 PP	47	mmio_trace_array = NULL;
f984b51e PP	48	}
f984b51e PP	49
bbf5b1a0	50	static void mmio_trace_start(struct trace_array *tr)
f984b51e PP	51	{
f984b51e PP	52	pr_debug("in %s\n", __func__);
bbf5b1a0	53	mmio_reset_data(tr);
bd8ac686 PP	54	}
bd8ac686 PP	55
13829537 PP	56	static int mmio_print_pcidev(struct trace_seq s, const struct pci_dev dev)
	57	{
	58	int ret = 0;
	59	int i;
	60	resource_size_t start, end;
	61	const struct pci_driver *drv = pci_dev_driver(dev);
	62
	63	/* XXX: incomplete checks for trace_seq_printf() return value */
	64	ret += trace_seq_printf(s, "PCIDEV %02x%02x %04x%04x %x",
	65	dev->bus->number, dev->devfn,
	66	dev->vendor, dev->device, dev->irq);
	67	/*
	68	* XXX: is pci_resource_to_user() appropriate, since we are
	69	* supposed to interpret the __ioremap() phys_addr argument based on
	70	* these printed values?
	71	*/
	72	for (i = 0; i < 7; i++) {
	73	pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
	74	ret += trace_seq_printf(s, " %llx",
	75	(unsigned long long)(start \|
	76	(dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
	77	}
	78	for (i = 0; i < 7; i++) {
	79	pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
	80	ret += trace_seq_printf(s, " %llx",
	81	dev->resource[i].start < dev->resource[i].end ?
	82	(unsigned long long)(end - start) + 1 : 0);
	83	}
	84	if (drv)
	85	ret += trace_seq_printf(s, " %s\n", drv->name);
	86	else
	87	ret += trace_seq_printf(s, " \n");
	88	return ret;
	89	}
	90
d0a7e8ca PP	91	static void destroy_header_iter(struct header_iter *hiter)
	92	{
	93	if (!hiter)
	94	return;
	95	pci_dev_put(hiter->dev);
	96	kfree(hiter);
	97	}
	98
	99	static void mmio_pipe_open(struct trace_iterator *iter)
bd8ac686	100	{
d0a7e8ca	101	struct header_iter *hiter;
bd8ac686	102	struct trace_seq *s = &iter->seq;
13829537 PP	103
	104	trace_seq_printf(s, "VERSION 20070824\n");
	105
d0a7e8ca PP	106	hiter = kzalloc(sizeof(*hiter), GFP_KERNEL);
	107	if (!hiter)
	108	return;
	109
	110	hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);
	111	iter->private = hiter;
	112	}
	113
	114	/* XXX: This is not called when the pipe is closed! */
	115	static void mmio_close(struct trace_iterator *iter)
	116	{
	117	struct header_iter *hiter = iter->private;
	118	destroy_header_iter(hiter);
	119	iter->private = NULL;
	120	}
	121
2039238b PP	122	static unsigned long count_overruns(struct trace_iterator *iter)
2039238b PP	123	{
2039238b	124	unsigned long cnt = 0;
7ee1768d PP	125	unsigned long over = ring_buffer_overruns(iter->tr->buffer);
	126
	127	if (over > prev_overruns)
	128	cnt = over - prev_overruns;
	129	prev_overruns = over;
2039238b PP	130	return cnt;
	131	}
	132
d0a7e8ca PP	133	static ssize_t mmio_read(struct trace_iterator iter, struct file filp,
	134	char __user ubuf, size_t cnt, loff_t ppos)
	135	{
	136	ssize_t ret;
	137	struct header_iter *hiter = iter->private;
	138	struct trace_seq *s = &iter->seq;
2039238b PP	139	unsigned long n;
	140
	141	n = count_overruns(iter);
	142	if (n) {
	143	/* XXX: This is later than where events were lost. */
	144	trace_seq_printf(s, "MARK 0.000000 Lost %lu events.\n", n);
	145	if (!overrun_detected)
	146	pr_warning("mmiotrace has lost events.\n");
	147	overrun_detected = true;
	148	goto print_out;
	149	}
d0a7e8ca PP	150
	151	if (!hiter)
	152	return 0;
	153
	154	mmio_print_pcidev(s, hiter->dev);
	155	hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, hiter->dev);
	156
	157	if (!hiter->dev) {
	158	destroy_header_iter(hiter);
	159	iter->private = NULL;
	160	}
	161
2039238b	162	print_out:
d0a7e8ca PP	163	ret = trace_seq_to_user(s, ubuf, cnt);
d0a7e8ca PP	164	return (ret == -EBUSY) ? 0 : ret;
bd8ac686 PP	165	}
bd8ac686 PP	166
07f4e4f7	167	static enum print_line_t mmio_print_rw(struct trace_iterator *iter)
bd8ac686 PP	168	{
bd8ac686 PP	169	struct trace_entry *entry = iter->ent;
7104f300 SR	170	struct trace_mmiotrace_rw *field;
7104f300 SR	171	struct mmiotrace_rw *rw;
bd8ac686	172	struct trace_seq *s = &iter->seq;
3928a8a2	173	unsigned long long t = ns2usecs(iter->ts);
bd8ac686 PP	174	unsigned long usec_rem = do_div(t, 1000000ULL);
	175	unsigned secs = (unsigned long)t;
	176	int ret = 1;
	177
7104f300 SR	178	trace_assign_type(field, entry);
	179	rw = &field->rw;
	180
777e208d	181	switch (rw->opcode) {
bd8ac686 PP	182	case MMIO_READ:
bd8ac686 PP	183	ret = trace_seq_printf(s,
dee310d0 PP	184	"R %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
	185	rw->width, secs, usec_rem, rw->map_id,
	186	(unsigned long long)rw->phys,
736ca61f	187	rw->value, rw->pc, 0);
bd8ac686 PP	188	break;
	189	case MMIO_WRITE:
	190	ret = trace_seq_printf(s,
dee310d0 PP	191	"W %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
	192	rw->width, secs, usec_rem, rw->map_id,
	193	(unsigned long long)rw->phys,
736ca61f	194	rw->value, rw->pc, 0);
bd8ac686 PP	195	break;
	196	case MMIO_UNKNOWN_OP:
	197	ret = trace_seq_printf(s,
dee310d0 PP	198	"UNKNOWN %lu.%06lu %d 0x%llx %02x,%02x,%02x 0x%lx %d\n",
	199	secs, usec_rem, rw->map_id,
	200	(unsigned long long)rw->phys,
bd8ac686	201	(rw->value >> 16) & 0xff, (rw->value >> 8) & 0xff,
736ca61f	202	(rw->value >> 0) & 0xff, rw->pc, 0);
bd8ac686 PP	203	break;
	204	default:
	205	ret = trace_seq_printf(s, "rw what?\n");
	206	break;
	207	}
	208	if (ret)
07f4e4f7 FW	209	return TRACE_TYPE_HANDLED;
07f4e4f7 FW	210	return TRACE_TYPE_PARTIAL_LINE;
bd8ac686 PP	211	}
bd8ac686 PP	212
07f4e4f7	213	static enum print_line_t mmio_print_map(struct trace_iterator *iter)
bd8ac686 PP	214	{
bd8ac686 PP	215	struct trace_entry *entry = iter->ent;
7104f300 SR	216	struct trace_mmiotrace_map *field;
7104f300 SR	217	struct mmiotrace_map *m;
bd8ac686	218	struct trace_seq *s = &iter->seq;
3928a8a2	219	unsigned long long t = ns2usecs(iter->ts);
bd8ac686 PP	220	unsigned long usec_rem = do_div(t, 1000000ULL);
bd8ac686 PP	221	unsigned secs = (unsigned long)t;
07f4e4f7	222	int ret;
bd8ac686	223
7104f300 SR	224	trace_assign_type(field, entry);
	225	m = &field->map;
	226
777e208d	227	switch (m->opcode) {
bd8ac686 PP	228	case MMIO_PROBE:
bd8ac686 PP	229	ret = trace_seq_printf(s,
dee310d0 PP	230	"MAP %lu.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n",
	231	secs, usec_rem, m->map_id,
	232	(unsigned long long)m->phys, m->virt, m->len,
e0fd5c2f	233	0UL, 0);
bd8ac686 PP	234	break;
	235	case MMIO_UNPROBE:
	236	ret = trace_seq_printf(s,
	237	"UNMAP %lu.%06lu %d 0x%lx %d\n",
e0fd5c2f	238	secs, usec_rem, m->map_id, 0UL, 0);
bd8ac686 PP	239	break;
	240	default:
	241	ret = trace_seq_printf(s, "map what?\n");
	242	break;
	243	}
	244	if (ret)
07f4e4f7 FW	245	return TRACE_TYPE_HANDLED;
07f4e4f7 FW	246	return TRACE_TYPE_PARTIAL_LINE;
bd8ac686 PP	247	}
bd8ac686 PP	248
07f4e4f7	249	static enum print_line_t mmio_print_mark(struct trace_iterator *iter)
fc5e27ae PP	250	{
fc5e27ae PP	251	struct trace_entry *entry = iter->ent;
777e208d SR	252	struct print_entry print = (struct print_entry )entry;
777e208d SR	253	const char *msg = print->buf;
fc5e27ae	254	struct trace_seq *s = &iter->seq;
3928a8a2	255	unsigned long long t = ns2usecs(iter->ts);
fc5e27ae PP	256	unsigned long usec_rem = do_div(t, 1000000ULL);
	257	unsigned secs = (unsigned long)t;
	258	int ret;
	259
	260	/* The trailing newline must be in the message. */
	261	ret = trace_seq_printf(s, "MARK %lu.%06lu %s", secs, usec_rem, msg);
	262	if (!ret)
07f4e4f7	263	return TRACE_TYPE_PARTIAL_LINE;
fc5e27ae	264
777e208d	265	if (entry->flags & TRACE_FLAG_CONT)
fc5e27ae PP	266	trace_seq_print_cont(s, iter);
fc5e27ae PP	267
07f4e4f7	268	return TRACE_TYPE_HANDLED;
fc5e27ae PP	269	}
fc5e27ae PP	270
07f4e4f7	271	static enum print_line_t mmio_print_line(struct trace_iterator *iter)
bd8ac686 PP	272	{
	273	switch (iter->ent->type) {
	274	case TRACE_MMIO_RW:
	275	return mmio_print_rw(iter);
	276	case TRACE_MMIO_MAP:
	277	return mmio_print_map(iter);
fc5e27ae PP	278	case TRACE_PRINT:
fc5e27ae PP	279	return mmio_print_mark(iter);
bd8ac686	280	default:
07f4e4f7	281	return TRACE_TYPE_HANDLED; /* ignore unknown entries */
bd8ac686	282	}
f984b51e PP	283	}
	284
	285	static struct tracer mmio_tracer __read_mostly =
	286	{
	287	.name = "mmiotrace",
	288	.init = mmio_trace_init,
	289	.reset = mmio_trace_reset,
bbf5b1a0	290	.start = mmio_trace_start,
d0a7e8ca PP	291	.pipe_open = mmio_pipe_open,
	292	.close = mmio_close,
	293	.read = mmio_read,
bd8ac686	294	.print_line = mmio_print_line,
f984b51e PP	295	};
	296
	297	__init static int init_mmio_trace(void)
	298	{
f984b51e PP	299	return register_tracer(&mmio_tracer);
	300	}
	301	device_initcall(init_mmio_trace);
	302
45dcd8b8 PP	303	static void __trace_mmiotrace_rw(struct trace_array *tr,
	304	struct trace_array_cpu *data,
	305	struct mmiotrace_rw *rw)
	306	{
3928a8a2	307	struct ring_buffer_event *event;
777e208d	308	struct trace_mmiotrace_rw *entry;
45dcd8b8 PP	309	unsigned long irq_flags;
45dcd8b8 PP	310
3928a8a2 SR	311	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
	312	&irq_flags);
	313	if (!event)
	314	return;
	315	entry = ring_buffer_event_data(event);
38697053	316	tracing_generic_entry_update(&entry->ent, 0, preempt_count());
777e208d SR	317	entry->ent.type = TRACE_MMIO_RW;
777e208d SR	318	entry->rw = *rw;
3928a8a2	319	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
45dcd8b8 PP	320
	321	trace_wake_up();
	322	}
	323
bd8ac686	324	void mmio_trace_rw(struct mmiotrace_rw *rw)
f984b51e PP	325	{
	326	struct trace_array *tr = mmio_trace_array;
	327	struct trace_array_cpu *data = tr->data[smp_processor_id()];
bd8ac686 PP	328	__trace_mmiotrace_rw(tr, data, rw);
bd8ac686 PP	329	}
f984b51e	330
45dcd8b8 PP	331	static void __trace_mmiotrace_map(struct trace_array *tr,
	332	struct trace_array_cpu *data,
	333	struct mmiotrace_map *map)
	334	{
3928a8a2	335	struct ring_buffer_event *event;
777e208d	336	struct trace_mmiotrace_map *entry;
45dcd8b8 PP	337	unsigned long irq_flags;
45dcd8b8 PP	338
3928a8a2 SR	339	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
	340	&irq_flags);
	341	if (!event)
	342	return;
	343	entry = ring_buffer_event_data(event);
38697053	344	tracing_generic_entry_update(&entry->ent, 0, preempt_count());
777e208d SR	345	entry->ent.type = TRACE_MMIO_MAP;
777e208d SR	346	entry->map = *map;
3928a8a2	347	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
45dcd8b8 PP	348
	349	trace_wake_up();
	350	}
	351
bd8ac686 PP	352	void mmio_trace_mapping(struct mmiotrace_map *map)
	353	{
	354	struct trace_array *tr = mmio_trace_array;
	355	struct trace_array_cpu *data;
	356
	357	preempt_disable();
	358	data = tr->data[smp_processor_id()];
	359	__trace_mmiotrace_map(tr, data, map);
	360	preempt_enable();
f984b51e	361	}
9e57fb35 PP	362
	363	int mmio_trace_printk(const char *fmt, va_list args)
	364	{
1fd8f2a3	365	return trace_vprintk(0, -1, fmt, args);
9e57fb35	366	}