363 lines
8.6 KiB
C
363 lines
8.6 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/*
|
||
|
|
* 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 <linux/slab.h>
|
||
|
|
#include <linux/time.h>
|
||
|
|
|
||
|
|
#include <linux/atomic.h>
|
||
|
|
|
||
|
|
#include "trace.h"
|
||
|
|
#include "trace_output.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->trace_buffer);
|
||
|
|
}
|
||
|
|
|
||
|
|
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 void mmio_print_pcidev(struct trace_seq *s, const struct pci_dev *dev)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
resource_size_t start, end;
|
||
|
|
const struct pci_driver *drv = pci_dev_driver(dev);
|
||
|
|
|
||
|
|
trace_seq_printf(s, "PCIDEV %02x%02x %04x%04x %x",
|
||
|
|
dev->bus->number, dev->devfn,
|
||
|
|
dev->vendor, dev->device, dev->irq);
|
||
|
|
for (i = 0; i < 7; i++) {
|
||
|
|
start = dev->resource[i].start;
|
||
|
|
trace_seq_printf(s, " %llx",
|
||
|
|
(unsigned long long)(start |
|
||
|
|
(dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
|
||
|
|
}
|
||
|
|
for (i = 0; i < 7; i++) {
|
||
|
|
start = dev->resource[i].start;
|
||
|
|
end = dev->resource[i].end;
|
||
|
|
trace_seq_printf(s, " %llx",
|
||
|
|
dev->resource[i].start < dev->resource[i].end ?
|
||
|
|
(unsigned long long)(end - start) + 1 : 0);
|
||
|
|
}
|
||
|
|
if (drv)
|
||
|
|
trace_seq_printf(s, " %s\n", drv->name);
|
||
|
|
else
|
||
|
|
trace_seq_puts(s, " \n");
|
||
|
|
}
|
||
|
|
|
||
|
|
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_puts(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->trace_buffer->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_warn("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, USEC_PER_SEC);
|
||
|
|
unsigned secs = (unsigned long)t;
|
||
|
|
|
||
|
|
trace_assign_type(field, entry);
|
||
|
|
rw = &field->rw;
|
||
|
|
|
||
|
|
switch (rw->opcode) {
|
||
|
|
case MMIO_READ:
|
||
|
|
trace_seq_printf(s,
|
||
|
|
"R %d %u.%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:
|
||
|
|
trace_seq_printf(s,
|
||
|
|
"W %d %u.%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:
|
||
|
|
trace_seq_printf(s,
|
||
|
|
"UNKNOWN %u.%06lu %d 0x%llx %02lx,%02lx,"
|
||
|
|
"%02lx 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:
|
||
|
|
trace_seq_puts(s, "rw what?\n");
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return trace_handle_return(s);
|
||
|
|
}
|
||
|
|
|
||
|
|
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, USEC_PER_SEC);
|
||
|
|
unsigned secs = (unsigned long)t;
|
||
|
|
|
||
|
|
trace_assign_type(field, entry);
|
||
|
|
m = &field->map;
|
||
|
|
|
||
|
|
switch (m->opcode) {
|
||
|
|
case MMIO_PROBE:
|
||
|
|
trace_seq_printf(s,
|
||
|
|
"MAP %u.%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:
|
||
|
|
trace_seq_printf(s,
|
||
|
|
"UNMAP %u.%06lu %d 0x%lx %d\n",
|
||
|
|
secs, usec_rem, m->map_id, 0UL, 0);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
trace_seq_puts(s, "map what?\n");
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return trace_handle_return(s);
|
||
|
|
}
|
||
|
|
|
||
|
|
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, USEC_PER_SEC);
|
||
|
|
unsigned secs = (unsigned long)t;
|
||
|
|
|
||
|
|
/* The trailing newline must be in the message. */
|
||
|
|
trace_seq_printf(s, "MARK %u.%06lu %s", secs, usec_rem, msg);
|
||
|
|
|
||
|
|
return trace_handle_return(s);
|
||
|
|
}
|
||
|
|
|
||
|
|
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,
|
||
|
|
.noboot = true,
|
||
|
|
};
|
||
|
|
|
||
|
|
__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 trace_event_call *call = &event_mmiotrace_rw;
|
||
|
|
struct ring_buffer *buffer = tr->trace_buffer.buffer;
|
||
|
|
struct ring_buffer_event *event;
|
||
|
|
struct trace_mmiotrace_rw *entry;
|
||
|
|
int pc = preempt_count();
|
||
|
|
|
||
|
|
event = trace_buffer_lock_reserve(buffer, TRACE_MMIO_RW,
|
||
|
|
sizeof(*entry), 0, pc);
|
||
|
|
if (!event) {
|
||
|
|
atomic_inc(&dropped_count);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
entry = ring_buffer_event_data(event);
|
||
|
|
entry->rw = *rw;
|
||
|
|
|
||
|
|
if (!call_filter_check_discard(call, entry, buffer, event))
|
||
|
|
trace_buffer_unlock_commit(tr, buffer, event, 0, pc);
|
||
|
|
}
|
||
|
|
|
||
|
|
void mmio_trace_rw(struct mmiotrace_rw *rw)
|
||
|
|
{
|
||
|
|
struct trace_array *tr = mmio_trace_array;
|
||
|
|
struct trace_array_cpu *data = per_cpu_ptr(tr->trace_buffer.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 trace_event_call *call = &event_mmiotrace_map;
|
||
|
|
struct ring_buffer *buffer = tr->trace_buffer.buffer;
|
||
|
|
struct ring_buffer_event *event;
|
||
|
|
struct trace_mmiotrace_map *entry;
|
||
|
|
int pc = preempt_count();
|
||
|
|
|
||
|
|
event = trace_buffer_lock_reserve(buffer, TRACE_MMIO_MAP,
|
||
|
|
sizeof(*entry), 0, pc);
|
||
|
|
if (!event) {
|
||
|
|
atomic_inc(&dropped_count);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
entry = ring_buffer_event_data(event);
|
||
|
|
entry->map = *map;
|
||
|
|
|
||
|
|
if (!call_filter_check_discard(call, entry, buffer, event))
|
||
|
|
trace_buffer_unlock_commit(tr, buffer, event, 0, pc);
|
||
|
|
}
|
||
|
|
|
||
|
|
void mmio_trace_mapping(struct mmiotrace_map *map)
|
||
|
|
{
|
||
|
|
struct trace_array *tr = mmio_trace_array;
|
||
|
|
struct trace_array_cpu *data;
|
||
|
|
|
||
|
|
preempt_disable();
|
||
|
|
data = per_cpu_ptr(tr->trace_buffer.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);
|
||
|
|
}
|