[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 <asm/atomic.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 atomic_t dropped_count;

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 = atomic_xchg(&dropped_count, 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) {
		atomic_inc(&dropped_count);
		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) {
		atomic_inc(&dropped_count);
		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>
391b170f	12	#include <asm/atomic.h>
f984b51e PP	13
	14	#include "trace.h"
	15
d0a7e8ca PP	16	struct header_iter {
	17	struct pci_dev *dev;
	18	};
	19
f984b51e	20	static struct trace_array *mmio_trace_array;
2039238b	21	static bool overrun_detected;
7ee1768d	22	static unsigned long prev_overruns;
391b170f	23	static atomic_t dropped_count;
f984b51e	24
bd8ac686 PP	25	static void mmio_reset_data(struct trace_array *tr)
bd8ac686 PP	26	{
2039238b	27	overrun_detected = false;
7ee1768d	28	prev_overruns = 0;
bd8ac686	29
213cc060	30	tracing_reset_online_cpus(tr);
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)
2039238b PP	125	{
391b170f	126	unsigned long cnt = atomic_xchg(&dropped_count, 0);
7ee1768d PP	127	unsigned long over = ring_buffer_overruns(iter->tr->buffer);
	128
	129	if (over > prev_overruns)
391b170f	130	cnt += over - prev_overruns;
7ee1768d	131	prev_overruns = over;
2039238b PP	132	return cnt;
	133	}
	134
d0a7e8ca PP	135	static ssize_t mmio_read(struct trace_iterator iter, struct file filp,
	136	char __user ubuf, size_t cnt, loff_t ppos)
	137	{
	138	ssize_t ret;
	139	struct header_iter *hiter = iter->private;
	140	struct trace_seq *s = &iter->seq;
2039238b PP	141	unsigned long n;
	142
	143	n = count_overruns(iter);
	144	if (n) {
	145	/* XXX: This is later than where events were lost. */
	146	trace_seq_printf(s, "MARK 0.000000 Lost %lu events.\n", n);
	147	if (!overrun_detected)
	148	pr_warning("mmiotrace has lost events.\n");
	149	overrun_detected = true;
	150	goto print_out;
	151	}
d0a7e8ca PP	152
	153	if (!hiter)
	154	return 0;
	155
	156	mmio_print_pcidev(s, hiter->dev);
	157	hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, hiter->dev);
	158
	159	if (!hiter->dev) {
	160	destroy_header_iter(hiter);
	161	iter->private = NULL;
	162	}
	163
2039238b	164	print_out:
d0a7e8ca PP	165	ret = trace_seq_to_user(s, ubuf, cnt);
d0a7e8ca PP	166	return (ret == -EBUSY) ? 0 : ret;
bd8ac686 PP	167	}
bd8ac686 PP	168
07f4e4f7	169	static enum print_line_t mmio_print_rw(struct trace_iterator *iter)
bd8ac686 PP	170	{
bd8ac686 PP	171	struct trace_entry *entry = iter->ent;
7104f300 SR	172	struct trace_mmiotrace_rw *field;
7104f300 SR	173	struct mmiotrace_rw *rw;
bd8ac686	174	struct trace_seq *s = &iter->seq;
3928a8a2	175	unsigned long long t = ns2usecs(iter->ts);
bd8ac686 PP	176	unsigned long usec_rem = do_div(t, 1000000ULL);
	177	unsigned secs = (unsigned long)t;
	178	int ret = 1;
	179
7104f300 SR	180	trace_assign_type(field, entry);
	181	rw = &field->rw;
	182
777e208d	183	switch (rw->opcode) {
bd8ac686 PP	184	case MMIO_READ:
bd8ac686 PP	185	ret = trace_seq_printf(s,
dee310d0 PP	186	"R %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
	187	rw->width, secs, usec_rem, rw->map_id,
	188	(unsigned long long)rw->phys,
736ca61f	189	rw->value, rw->pc, 0);
bd8ac686 PP	190	break;
	191	case MMIO_WRITE:
	192	ret = trace_seq_printf(s,
dee310d0 PP	193	"W %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_UNKNOWN_OP:
	199	ret = trace_seq_printf(s,
dee310d0 PP	200	"UNKNOWN %lu.%06lu %d 0x%llx %02x,%02x,%02x 0x%lx %d\n",
	201	secs, usec_rem, rw->map_id,
	202	(unsigned long long)rw->phys,
bd8ac686	203	(rw->value >> 16) & 0xff, (rw->value >> 8) & 0xff,
736ca61f	204	(rw->value >> 0) & 0xff, rw->pc, 0);
bd8ac686 PP	205	break;
	206	default:
	207	ret = trace_seq_printf(s, "rw what?\n");
	208	break;
	209	}
	210	if (ret)
07f4e4f7 FW	211	return TRACE_TYPE_HANDLED;
07f4e4f7 FW	212	return TRACE_TYPE_PARTIAL_LINE;
bd8ac686 PP	213	}
bd8ac686 PP	214
07f4e4f7	215	static enum print_line_t mmio_print_map(struct trace_iterator *iter)
bd8ac686 PP	216	{
bd8ac686 PP	217	struct trace_entry *entry = iter->ent;
7104f300 SR	218	struct trace_mmiotrace_map *field;
7104f300 SR	219	struct mmiotrace_map *m;
bd8ac686	220	struct trace_seq *s = &iter->seq;
3928a8a2	221	unsigned long long t = ns2usecs(iter->ts);
bd8ac686 PP	222	unsigned long usec_rem = do_div(t, 1000000ULL);
bd8ac686 PP	223	unsigned secs = (unsigned long)t;
07f4e4f7	224	int ret;
bd8ac686	225
7104f300 SR	226	trace_assign_type(field, entry);
	227	m = &field->map;
	228
777e208d	229	switch (m->opcode) {
bd8ac686 PP	230	case MMIO_PROBE:
bd8ac686 PP	231	ret = trace_seq_printf(s,
dee310d0 PP	232	"MAP %lu.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n",
	233	secs, usec_rem, m->map_id,
	234	(unsigned long long)m->phys, m->virt, m->len,
e0fd5c2f	235	0UL, 0);
bd8ac686 PP	236	break;
	237	case MMIO_UNPROBE:
	238	ret = trace_seq_printf(s,
	239	"UNMAP %lu.%06lu %d 0x%lx %d\n",
e0fd5c2f	240	secs, usec_rem, m->map_id, 0UL, 0);
bd8ac686 PP	241	break;
	242	default:
	243	ret = trace_seq_printf(s, "map what?\n");
	244	break;
	245	}
	246	if (ret)
07f4e4f7 FW	247	return TRACE_TYPE_HANDLED;
07f4e4f7 FW	248	return TRACE_TYPE_PARTIAL_LINE;
bd8ac686 PP	249	}
bd8ac686 PP	250
07f4e4f7	251	static enum print_line_t mmio_print_mark(struct trace_iterator *iter)
fc5e27ae PP	252	{
fc5e27ae PP	253	struct trace_entry *entry = iter->ent;
777e208d SR	254	struct print_entry print = (struct print_entry )entry;
777e208d SR	255	const char *msg = print->buf;
fc5e27ae	256	struct trace_seq *s = &iter->seq;
3928a8a2	257	unsigned long long t = ns2usecs(iter->ts);
fc5e27ae PP	258	unsigned long usec_rem = do_div(t, 1000000ULL);
	259	unsigned secs = (unsigned long)t;
	260	int ret;
	261
	262	/* The trailing newline must be in the message. */
	263	ret = trace_seq_printf(s, "MARK %lu.%06lu %s", secs, usec_rem, msg);
	264	if (!ret)
07f4e4f7	265	return TRACE_TYPE_PARTIAL_LINE;
fc5e27ae	266
777e208d	267	if (entry->flags & TRACE_FLAG_CONT)
fc5e27ae PP	268	trace_seq_print_cont(s, iter);
fc5e27ae PP	269
07f4e4f7	270	return TRACE_TYPE_HANDLED;
fc5e27ae PP	271	}
fc5e27ae PP	272
07f4e4f7	273	static enum print_line_t mmio_print_line(struct trace_iterator *iter)
bd8ac686 PP	274	{
	275	switch (iter->ent->type) {
	276	case TRACE_MMIO_RW:
	277	return mmio_print_rw(iter);
	278	case TRACE_MMIO_MAP:
	279	return mmio_print_map(iter);
fc5e27ae PP	280	case TRACE_PRINT:
fc5e27ae PP	281	return mmio_print_mark(iter);
bd8ac686	282	default:
07f4e4f7	283	return TRACE_TYPE_HANDLED; /* ignore unknown entries */
bd8ac686	284	}
f984b51e PP	285	}
	286
	287	static struct tracer mmio_tracer __read_mostly =
	288	{
	289	.name = "mmiotrace",
	290	.init = mmio_trace_init,
	291	.reset = mmio_trace_reset,
bbf5b1a0	292	.start = mmio_trace_start,
d0a7e8ca PP	293	.pipe_open = mmio_pipe_open,
	294	.close = mmio_close,
	295	.read = mmio_read,
bd8ac686	296	.print_line = mmio_print_line,
f984b51e PP	297	};
	298
	299	__init static int init_mmio_trace(void)
	300	{
f984b51e PP	301	return register_tracer(&mmio_tracer);
	302	}
	303	device_initcall(init_mmio_trace);
	304
45dcd8b8 PP	305	static void __trace_mmiotrace_rw(struct trace_array *tr,
	306	struct trace_array_cpu *data,
	307	struct mmiotrace_rw *rw)
	308	{
3928a8a2	309	struct ring_buffer_event *event;
777e208d	310	struct trace_mmiotrace_rw *entry;
45dcd8b8 PP	311	unsigned long irq_flags;
45dcd8b8 PP	312
3928a8a2 SR	313	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
3928a8a2 SR	314	&irq_flags);
391b170f PP	315	if (!event) {
391b170f PP	316	atomic_inc(&dropped_count);
3928a8a2	317	return;
391b170f	318	}
3928a8a2	319	entry = ring_buffer_event_data(event);
38697053	320	tracing_generic_entry_update(&entry->ent, 0, preempt_count());
777e208d SR	321	entry->ent.type = TRACE_MMIO_RW;
777e208d SR	322	entry->rw = *rw;
3928a8a2	323	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
45dcd8b8 PP	324
	325	trace_wake_up();
	326	}
	327
bd8ac686	328	void mmio_trace_rw(struct mmiotrace_rw *rw)
f984b51e PP	329	{
	330	struct trace_array *tr = mmio_trace_array;
	331	struct trace_array_cpu *data = tr->data[smp_processor_id()];
bd8ac686 PP	332	__trace_mmiotrace_rw(tr, data, rw);
bd8ac686 PP	333	}
f984b51e	334
45dcd8b8 PP	335	static void __trace_mmiotrace_map(struct trace_array *tr,
	336	struct trace_array_cpu *data,
	337	struct mmiotrace_map *map)
	338	{
3928a8a2	339	struct ring_buffer_event *event;
777e208d	340	struct trace_mmiotrace_map *entry;
45dcd8b8 PP	341	unsigned long irq_flags;
45dcd8b8 PP	342
3928a8a2 SR	343	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
3928a8a2 SR	344	&irq_flags);
391b170f PP	345	if (!event) {
391b170f PP	346	atomic_inc(&dropped_count);
3928a8a2	347	return;
391b170f	348	}
3928a8a2	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	{
1fd8f2a3	371	return trace_vprintk(0, -1, fmt, args);
9e57fb35	372	}