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ARM: etm: Allow range selection

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Trace kernel text segment by default as before, allow tracing of other
ranges by writing a range to /sys/devices/etm/trace_range, or to trace
everything by writing 0 0.

Change-Id: Ibb734ca820fedf79560b20536247f1e1700cdc71
Signed-off-by: Arve Hjønnevåg <arve@android.com>
This commit is contained in:
Arve Hjønnevåg
2011-01-28 23:44:43 -08:00
parent d2a4ecd566
commit 6fc30cba70
1 changed files with 46 additions and 3 deletions
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49
arch/arm/kernel/etm.c
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@@ -41,12 +41,17 @@ struct tracectx {
unsigned long flags;
int ncmppairs;
int etm_portsz;
unsigned long range_start;
unsigned long range_end;
struct device *dev;
struct clk *emu_clk;
struct mutex mutex;
};
static struct tracectx tracer;
static struct tracectx tracer = {
.range_start = (unsigned long)_stext,
.range_end = (unsigned long)_etext,
};
static inline bool trace_isrunning(struct tracectx *t)
{
@@ -116,8 +121,12 @@ static int trace_start(struct tracectx *t)
return -EFAULT;
}
etm_setup_address_range(t, 1, (unsigned long)_stext,
(unsigned long)_etext, 0, 0);
if (t->range_start || t->range_end)
etm_setup_address_range(t, 1,
t->range_start, t->range_end, 0, 0);
else
etm_writel(t, ETMTE_INCLEXCL, ETMR_TRACEENCTRL);
etm_writel(t, 0, ETMR_TRACEENCTRL2);
etm_writel(t, 0, ETMR_TRACESSCTRL);
etm_writel(t, 0x6f, ETMR_TRACEENEVT);
@@ -526,6 +535,35 @@ static ssize_t trace_mode_store(struct kobject *kobj,
static struct kobj_attribute trace_mode_attr =
__ATTR(trace_mode, 0644, trace_mode_show, trace_mode_store);
static ssize_t trace_range_show(struct kobject *kobj,
struct kobj_attribute *attr,
char *buf)
{
return sprintf(buf, "%08lx %08lx\n",
tracer.range_start, tracer.range_end);
}
static ssize_t trace_range_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t n)
{
unsigned long range_start, range_end;
if (sscanf(buf, "%lx %lx", &range_start, &range_end) != 2)
return -EINVAL;
mutex_lock(&tracer.mutex);
tracer.range_start = range_start;
tracer.range_end = range_end;
mutex_unlock(&tracer.mutex);
return n;
}
static struct kobj_attribute trace_range_attr =
__ATTR(trace_range, 0644, trace_range_show, trace_range_store);
static int etm_probe(struct amba_device *dev, const struct amba_id *id)
{
struct tracectx *t = &tracer;
@@ -577,6 +615,10 @@ static int etm_probe(struct amba_device *dev, const struct amba_id *id)
if (ret)
dev_dbg(&dev->dev, "Failed to create trace_mode in sysfs\n");
ret = sysfs_create_file(&dev->dev.kobj, &trace_range_attr.attr);
if (ret)
dev_dbg(&dev->dev, "Failed to create trace_range in sysfs\n");
dev_dbg(t->dev, "ETM AMBA driver initialized.\n");
out:
@@ -606,6 +648,7 @@ static int etm_remove(struct amba_device *dev)
sysfs_remove_file(&dev->dev.kobj, &trace_running_attr.attr);
sysfs_remove_file(&dev->dev.kobj, &trace_info_attr.attr);
sysfs_remove_file(&dev->dev.kobj, &trace_mode_attr.attr);
sysfs_remove_file(&dev->dev.kobj, &trace_range_attr.attr);
return 0;
}