diff options
Diffstat (limited to 'arch/arm/kernel/etm.c')
-rw-r--r-- | arch/arm/kernel/etm.c | 41 |
1 files changed, 40 insertions, 1 deletions
diff --git a/arch/arm/kernel/etm.c b/arch/arm/kernel/etm.c index c61f7cbfa18..af2a38b4f93 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_CYCLE_ACC) v |= ETMCTRL_CYCLEACCURATE; + if (t->flags & TRACER_BRANCHOUTPUT) + v |= ETMCTRL_BRANCH_OUTPUT; + if (t->flags & TRACER_TRACE_DATA) v |= ETMCTRL_DATA_DO_ADDR; @@ -683,6 +686,36 @@ 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_branch_output_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sprintf(buf, "%d\n", !!(tracer.flags & TRACER_BRANCHOUTPUT)); +} + +static ssize_t trace_branch_output_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t n) +{ + unsigned int branch_output; + + if (sscanf(buf, "%u", &branch_output) != 1) + return -EINVAL; + + mutex_lock(&tracer.mutex); + if (branch_output) + tracer.flags |= TRACER_BRANCHOUTPUT; + else + tracer.flags &= ~TRACER_BRANCHOUTPUT; + mutex_unlock(&tracer.mutex); + + return n; +} + +static struct kobj_attribute trace_branch_output_attr = + __ATTR(trace_branch_output, 0644, + trace_branch_output_show, trace_branch_output_store); + static ssize_t trace_timestamp_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) @@ -820,7 +853,7 @@ static int etm_probe(struct amba_device *dev, const struct amba_id *id) amba_set_drvdata(dev, t->etm_regs[t->etm_regs_count]); - t->flags = TRACER_CYCLE_ACC | TRACER_TRACE_DATA; + t->flags = TRACER_CYCLE_ACC | TRACER_TRACE_DATA | TRACER_BRANCHOUTPUT; t->etm_portsz = 1; t->etm_contextid_size = 3; @@ -861,6 +894,12 @@ static int etm_probe(struct amba_device *dev, const struct amba_id *id) dev_dbg(&dev->dev, "Failed to create trace_contextid_size in sysfs\n"); + ret = sysfs_create_file(&dev->dev.kobj, + &trace_branch_output_attr.attr); + if (ret) + dev_dbg(&dev->dev, + "Failed to create trace_branch_output in sysfs\n"); + if (etmccer & ETMCCER_TIMESTAMPING_IMPLEMENTED) { ret = sysfs_create_file(&dev->dev.kobj, &trace_timestamp_attr.attr); |