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 13:25:55 +0800 |
| commit | 829c3284e802cd3100f5a28a59b41c3ed5f57463 (patch) | |
| tree | 0a5502ceca55dffa09a760ce6a4e624e432591bf /arch/arm/kernel | |
| parent | 86a7393665c7d6fb5fed84de15f50d394d55c8d8 (diff) | |
| download | linux-829c3284e802cd3100f5a28a59b41c3ed5f57463.tar.gz | |
ARM: etm: Add sysfs entry to set context-id-size
Change-Id: I520dfb6e593dac131de8b9b1db77f1c734f18c24
Signed-off-by: Arve Hjønnevåg <arve@android.com>
Diffstat (limited to 'arch/arm/kernel')
| -rw-r--r-- | arch/arm/kernel/etm.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/arch/arm/kernel/etm.c b/arch/arm/kernel/etm.c index d83ba792dced..9cba22d2047c 100644 --- a/arch/arm/kernel/etm.c +++ b/arch/arm/kernel/etm.c @@ -42,6 +42,7 @@ struct tracectx { unsigned long flags; int ncmppairs; int etm_portsz; + int etm_contextid_size; u32 etb_fc; unsigned long range_start; unsigned long range_end; @@ -108,6 +109,7 @@ static int trace_start_etm(struct tracectx *t, int id) unsigned long timeout = TRACER_TIMEOUT; v = ETMCTRL_OPTS | ETMCTRL_PROGRAM | ETMCTRL_PORTSIZE(t->etm_portsz); + v |= ETMCTRL_CONTEXTIDSIZE(t->etm_contextid_size); if (t->flags & TRACER_CYCLE_ACC) v |= ETMCTRL_CYCLEACCURATE; @@ -649,6 +651,37 @@ 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_contextid_size_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + /* 0: No context id tracing, 1: One byte, 2: Two bytes, 3: Four bytes */ + return sprintf(buf, "%d\n", (1 << tracer.etm_contextid_size) >> 1); +} + +static ssize_t trace_contextid_size_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t n) +{ + unsigned int contextid_size; + + if (sscanf(buf, "%u", &contextid_size) != 1) + return -EINVAL; + + if (contextid_size == 3 || contextid_size > 4) + return -EINVAL; + + mutex_lock(&tracer.mutex); + tracer.etm_contextid_size = fls(contextid_size); + mutex_unlock(&tracer.mutex); + + return n; +} + +static struct kobj_attribute trace_contextid_size_attr = + __ATTR(trace_contextid_size, 0644, + trace_contextid_size_show, trace_contextid_size_store); + static ssize_t trace_timestamp_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) @@ -788,6 +821,7 @@ static int __devinit etm_probe(struct amba_device *dev, const struct amba_id *id t->flags = TRACER_CYCLE_ACC | TRACER_TRACE_DATA; t->etm_portsz = 1; + t->etm_contextid_size = 3; etm_unlock(t, t->etm_regs_count); (void)etm_readl(t, t->etm_regs_count, ETMMR_PDSR); @@ -820,6 +854,12 @@ 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"); + ret = sysfs_create_file(&dev->dev.kobj, + &trace_contextid_size_attr.attr); + if (ret) + dev_dbg(&dev->dev, + "Failed to create trace_contextid_size in sysfs\n"); + if (etmccer & ETMCCER_TIMESTAMPING_IMPLEMENTED) { ret = sysfs_create_file(&dev->dev.kobj, &trace_timestamp_attr.attr); |