triggering a window switch for the buffer. Returns an error in any
other operating mode or attempts to write something other than "1".
+What: /sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/stop_on_full
+Date: March 2020
+KernelVersion: 5.7
+Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com>
+Description: (RW) Configure whether trace stops when the last available window
+ becomes full (1/y/Y) or wraps around and continues until the next
+ window becomes available again (0/n/N).
+
struct list_head win_list;
struct sg_table single_sgt;
struct msc_window *cur_win;
+ struct msc_window *switch_on_unlock;
unsigned long nr_pages;
unsigned long single_sz;
unsigned int single_wrap : 1;
struct list_head iter_list;
+ bool stop_on_full;
+
/* config */
unsigned int enabled : 1,
wrap : 1,
return;
msc_win_set_lockout(win, WIN_LOCKED, WIN_READY);
+ if (msc->switch_on_unlock == win) {
+ msc->switch_on_unlock = NULL;
+ msc_win_switch(msc);
+ }
}
EXPORT_SYMBOL_GPL(intel_th_msc_window_unlock);
/* next window: if READY, proceed, if LOCKED, stop the trace */
if (msc_win_set_lockout(next_win, WIN_READY, WIN_INUSE)) {
- schedule_work(&msc->work);
+ if (msc->stop_on_full)
+ schedule_work(&msc->work);
+ else
+ msc->switch_on_unlock = next_win;
+
return IRQ_HANDLED;
}
static DEVICE_ATTR_WO(win_switch);
+static ssize_t stop_on_full_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct msc *msc = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%d\n", msc->stop_on_full);
+}
+
+static ssize_t stop_on_full_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ struct msc *msc = dev_get_drvdata(dev);
+ int ret;
+
+ ret = kstrtobool(buf, &msc->stop_on_full);
+ if (ret)
+ return ret;
+
+ return size;
+}
+
+static DEVICE_ATTR_RW(stop_on_full);
+
static struct attribute *msc_output_attrs[] = {
&dev_attr_wrap.attr,
&dev_attr_mode.attr,
&dev_attr_nr_pages.attr,
&dev_attr_win_switch.attr,
+ &dev_attr_stop_on_full.attr,
NULL,
};