[deliverable/linux.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;
	if (tr->ctrl) {
		mmio_reset_data(tr);
		enable_mmiotrace();
	}
}

static void mmio_trace_reset(struct trace_array *tr)
{
	pr_debug("in %s\n", __func__);
	if (tr->ctrl)
		disable_mmiotrace();
	mmio_reset_data(tr);
	mmio_trace_array = NULL;
}

static void mmio_trace_ctrl_update(struct trace_array *tr)
{
	pr_debug("in %s\n", __func__);
	if (tr->ctrl) {
		mmio_reset_data(tr);
		enable_mmiotrace();
	} else {
		disable_mmiotrace();
	}
}

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 trace_mmiotrace_rw *)entry;
	struct mmiotrace_rw *rw	= &field->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;

	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 mmiotrace_map *m	= (struct mmiotrace_map *)entry;
	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;

	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,
	.pipe_open	= mmio_pipe_open,
	.close		= mmio_close,
	.read		= mmio_read,
	.ctrl_update	= mmio_trace_ctrl_update,
	.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);
	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);
	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;
bd8ac686 PP	37	if (tr->ctrl) {
bd8ac686 PP	38	mmio_reset_data(tr);
f984b51e	39	enable_mmiotrace();
bd8ac686	40	}
f984b51e PP	41	}
	42
	43	static void mmio_trace_reset(struct trace_array *tr)
	44	{
	45	pr_debug("in %s\n", __func__);
	46	if (tr->ctrl)
	47	disable_mmiotrace();
bd8ac686 PP	48	mmio_reset_data(tr);
bd8ac686 PP	49	mmio_trace_array = NULL;
f984b51e PP	50	}
	51
	52	static void mmio_trace_ctrl_update(struct trace_array *tr)
	53	{
	54	pr_debug("in %s\n", __func__);
bd8ac686 PP	55	if (tr->ctrl) {
bd8ac686 PP	56	mmio_reset_data(tr);
f984b51e	57	enable_mmiotrace();
bd8ac686	58	} else {
f984b51e	59	disable_mmiotrace();
bd8ac686 PP	60	}
	61	}
	62
13829537 PP	63	static int mmio_print_pcidev(struct trace_seq s, const struct pci_dev dev)
	64	{
	65	int ret = 0;
	66	int i;
	67	resource_size_t start, end;
	68	const struct pci_driver *drv = pci_dev_driver(dev);
	69
	70	/* XXX: incomplete checks for trace_seq_printf() return value */
	71	ret += trace_seq_printf(s, "PCIDEV %02x%02x %04x%04x %x",
	72	dev->bus->number, dev->devfn,
	73	dev->vendor, dev->device, dev->irq);
	74	/*
	75	* XXX: is pci_resource_to_user() appropriate, since we are
	76	* supposed to interpret the __ioremap() phys_addr argument based on
	77	* these printed values?
	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	(unsigned long long)(start \|
	83	(dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
	84	}
	85	for (i = 0; i < 7; i++) {
	86	pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
	87	ret += trace_seq_printf(s, " %llx",
	88	dev->resource[i].start < dev->resource[i].end ?
	89	(unsigned long long)(end - start) + 1 : 0);
	90	}
	91	if (drv)
	92	ret += trace_seq_printf(s, " %s\n", drv->name);
	93	else
	94	ret += trace_seq_printf(s, " \n");
	95	return ret;
	96	}
	97
d0a7e8ca PP	98	static void destroy_header_iter(struct header_iter *hiter)
	99	{
	100	if (!hiter)
	101	return;
	102	pci_dev_put(hiter->dev);
	103	kfree(hiter);
	104	}
	105
	106	static void mmio_pipe_open(struct trace_iterator *iter)
bd8ac686	107	{
d0a7e8ca	108	struct header_iter *hiter;
bd8ac686	109	struct trace_seq *s = &iter->seq;
13829537 PP	110
	111	trace_seq_printf(s, "VERSION 20070824\n");
	112
d0a7e8ca PP	113	hiter = kzalloc(sizeof(*hiter), GFP_KERNEL);
	114	if (!hiter)
	115	return;
	116
	117	hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);
	118	iter->private = hiter;
	119	}
	120
	121	/* XXX: This is not called when the pipe is closed! */
	122	static void mmio_close(struct trace_iterator *iter)
	123	{
	124	struct header_iter *hiter = iter->private;
	125	destroy_header_iter(hiter);
	126	iter->private = NULL;
	127	}
	128
2039238b PP	129	static unsigned long count_overruns(struct trace_iterator *iter)
	130	{
	131	int cpu;
	132	unsigned long cnt = 0;
3928a8a2 SR	133	/* FIXME: */
3928a8a2 SR	134	#if 0
2039238b PP	135	for_each_online_cpu(cpu) {
	136	cnt += iter->overrun[cpu];
	137	iter->overrun[cpu] = 0;
	138	}
3928a8a2 SR	139	#endif
3928a8a2 SR	140	(void)cpu;
2039238b PP	141	return cnt;
	142	}
	143
d0a7e8ca PP	144	static ssize_t mmio_read(struct trace_iterator iter, struct file filp,
	145	char __user ubuf, size_t cnt, loff_t ppos)
	146	{
	147	ssize_t ret;
	148	struct header_iter *hiter = iter->private;
	149	struct trace_seq *s = &iter->seq;
2039238b PP	150	unsigned long n;
	151
	152	n = count_overruns(iter);
	153	if (n) {
	154	/* XXX: This is later than where events were lost. */
	155	trace_seq_printf(s, "MARK 0.000000 Lost %lu events.\n", n);
	156	if (!overrun_detected)
	157	pr_warning("mmiotrace has lost events.\n");
	158	overrun_detected = true;
	159	goto print_out;
	160	}
d0a7e8ca PP	161
	162	if (!hiter)
	163	return 0;
	164
	165	mmio_print_pcidev(s, hiter->dev);
	166	hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, hiter->dev);
	167
	168	if (!hiter->dev) {
	169	destroy_header_iter(hiter);
	170	iter->private = NULL;
	171	}
	172
2039238b	173	print_out:
d0a7e8ca PP	174	ret = trace_seq_to_user(s, ubuf, cnt);
d0a7e8ca PP	175	return (ret == -EBUSY) ? 0 : ret;
bd8ac686 PP	176	}
bd8ac686 PP	177
07f4e4f7	178	static enum print_line_t mmio_print_rw(struct trace_iterator *iter)
bd8ac686 PP	179	{
bd8ac686 PP	180	struct trace_entry *entry = iter->ent;
777e208d SR	181	struct trace_mmiotrace_rw *field =
	182	(struct trace_mmiotrace_rw *)entry;
	183	struct mmiotrace_rw *rw = &field->rw;
bd8ac686	184	struct trace_seq *s = &iter->seq;
3928a8a2	185	unsigned long long t = ns2usecs(iter->ts);
bd8ac686 PP	186	unsigned long usec_rem = do_div(t, 1000000ULL);
	187	unsigned secs = (unsigned long)t;
	188	int ret = 1;
	189
777e208d	190	switch (rw->opcode) {
bd8ac686 PP	191	case MMIO_READ:
bd8ac686 PP	192	ret = trace_seq_printf(s,
dee310d0 PP	193	"R %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
	194	rw->width, secs, usec_rem, rw->map_id,
	195	(unsigned long long)rw->phys,
736ca61f	196	rw->value, rw->pc, 0);
bd8ac686 PP	197	break;
	198	case MMIO_WRITE:
	199	ret = trace_seq_printf(s,
dee310d0 PP	200	"W %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
	201	rw->width, secs, usec_rem, rw->map_id,
	202	(unsigned long long)rw->phys,
736ca61f	203	rw->value, rw->pc, 0);
bd8ac686 PP	204	break;
	205	case MMIO_UNKNOWN_OP:
	206	ret = trace_seq_printf(s,
dee310d0 PP	207	"UNKNOWN %lu.%06lu %d 0x%llx %02x,%02x,%02x 0x%lx %d\n",
	208	secs, usec_rem, rw->map_id,
	209	(unsigned long long)rw->phys,
bd8ac686	210	(rw->value >> 16) & 0xff, (rw->value >> 8) & 0xff,
736ca61f	211	(rw->value >> 0) & 0xff, rw->pc, 0);
bd8ac686 PP	212	break;
	213	default:
	214	ret = trace_seq_printf(s, "rw what?\n");
	215	break;
	216	}
	217	if (ret)
07f4e4f7 FW	218	return TRACE_TYPE_HANDLED;
07f4e4f7 FW	219	return TRACE_TYPE_PARTIAL_LINE;
bd8ac686 PP	220	}
bd8ac686 PP	221
07f4e4f7	222	static enum print_line_t mmio_print_map(struct trace_iterator *iter)
bd8ac686 PP	223	{
bd8ac686 PP	224	struct trace_entry *entry = iter->ent;
777e208d	225	struct mmiotrace_map m = (struct mmiotrace_map )entry;
bd8ac686	226	struct trace_seq *s = &iter->seq;
3928a8a2	227	unsigned long long t = ns2usecs(iter->ts);
bd8ac686 PP	228	unsigned long usec_rem = do_div(t, 1000000ULL);
bd8ac686 PP	229	unsigned secs = (unsigned long)t;
07f4e4f7	230	int ret;
bd8ac686	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,
d0a7e8ca PP	295	.pipe_open = mmio_pipe_open,
	296	.close = mmio_close,
	297	.read = mmio_read,
f984b51e	298	.ctrl_update = mmio_trace_ctrl_update,
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);
777e208d SR	321	tracing_generic_entry_update(&entry->ent, 0);
	322	entry->ent.type = TRACE_MMIO_RW;
	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);
777e208d SR	349	tracing_generic_entry_update(&entry->ent, 0);
	350	entry->ent.type = TRACE_MMIO_MAP;
	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	}