diff options
| author | Arve Hjønnevåg <arve@android.com> | 2012-04-02 17:20:32 -0700 |
|---|---|---|
| committer | Frank Li <Frank.Li@freescale.com> | 2012-09-26 13:24:57 +0800 |
| commit | 86a7393665c7d6fb5fed84de15f50d394d55c8d8 (patch) | |
| tree | 4f1fc82975faf9457ba39c09e69e32f8107b586e /arch/arm/kernel | |
| parent | 8449220d6931f572f20f62a20b745949c65d1a7b (diff) | |
ARM: etm: Add sysfs entry to enable timestamps if supported
Change-Id: Iff964ba2f6236ed81863e02ec7b3ec9fbc48044a
Signed-off-by: Arve Hjønnevåg <arve@android.com>
Diffstat (limited to 'arch/arm/kernel')
| -rw-r--r-- | arch/arm/kernel/etm.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/arm/kernel/etm.c b/arch/arm/kernel/etm.c index 9cdbb6d2a4e1..d83ba792dced 100644 --- a/arch/arm/kernel/etm.c +++ b/arch/arm/kernel/etm.c @@ -115,6 +115,9 @@ static int trace_start_etm(struct tracectx *t, int id) if (t->flags & TRACER_TRACE_DATA) v |= ETMCTRL_DATA_DO_ADDR; + if (t->flags & TRACER_TIMESTAMP) + v |= ETMCTRL_TIMESTAMP_EN; + etm_unlock(t, id); etm_writel(t, id, v, ETMR_CTRL); @@ -646,6 +649,36 @@ 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_timestamp_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sprintf(buf, "%d\n", !!(tracer.flags & TRACER_TIMESTAMP)); +} + +static ssize_t trace_timestamp_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t n) +{ + unsigned int timestamp; + + if (sscanf(buf, "%u", ×tamp) != 1) + return -EINVAL; + + mutex_lock(&tracer.mutex); + if (timestamp) + tracer.flags |= TRACER_TIMESTAMP; + else + tracer.flags &= ~TRACER_TIMESTAMP; + mutex_unlock(&tracer.mutex); + + return n; +} + +static struct kobj_attribute trace_timestamp_attr = + __ATTR(trace_timestamp, 0644, + trace_timestamp_show, trace_timestamp_store); + static ssize_t trace_range_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) @@ -725,6 +758,7 @@ static int __devinit etm_probe(struct amba_device *dev, const struct amba_id *id int new_count; u32 etmccr; u32 etmidr; + u32 etmccer = 0; u8 etm_version = 0; mutex_lock(&t->mutex); @@ -765,6 +799,8 @@ static int __devinit etm_probe(struct amba_device *dev, const struct amba_id *id if (etmccr & ETMCCR_ETMIDR_PRESENT) { etmidr = etm_readl(t, t->etm_regs_count, ETMR_ID); etm_version = ETMIDR_VERSION(etmidr); + if (etm_version >= ETMIDR_VERSION_3_1) + etmccer = etm_readl(t, t->etm_regs_count, ETMR_CCE); } etm_writel(t, t->etm_regs_count, 0x441, ETMR_CTRL); etm_writel(t, t->etm_regs_count, new_count, ETMR_TRACEIDR); @@ -784,6 +820,14 @@ static int __devinit 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"); + if (etmccer & ETMCCER_TIMESTAMPING_IMPLEMENTED) { + ret = sysfs_create_file(&dev->dev.kobj, + &trace_timestamp_attr.attr); + if (ret) + dev_dbg(&dev->dev, + "Failed to create trace_timestamp 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"); |