From 6cac7866c27418cd784fbb8041c2dddd6d966bc7 Mon Sep 17 00:00:00 2001 From: Alexander Shishkin Date: Fri, 3 May 2019 11:44:50 +0300 Subject: intel_th: msu: Add a sysfs attribute to trigger window switch Now that we have the means to trigger a window switch for the MSU trace store, add a sysfs file to allow triggering it from userspace. Signed-off-by: Alexander Shishkin Signed-off-by: Greg Kroah-Hartman --- drivers/hwtracing/intel_th/msu.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) (limited to 'drivers/hwtracing') diff --git a/drivers/hwtracing/intel_th/msu.c b/drivers/hwtracing/intel_th/msu.c index b0bb69942328..aed72b33675d 100644 --- a/drivers/hwtracing/intel_th/msu.c +++ b/drivers/hwtracing/intel_th/msu.c @@ -1572,10 +1572,38 @@ free_win: static DEVICE_ATTR_RW(nr_pages); +static ssize_t +win_switch_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t size) +{ + struct msc *msc = dev_get_drvdata(dev); + unsigned long val; + int ret; + + ret = kstrtoul(buf, 10, &val); + if (ret) + return ret; + + if (val != 1) + return -EINVAL; + + mutex_lock(&msc->buf_mutex); + if (msc->mode != MSC_MODE_MULTI) + ret = -ENOTSUPP; + else + ret = intel_th_trace_switch(msc->thdev); + mutex_unlock(&msc->buf_mutex); + + return ret ? ret : size; +} + +static DEVICE_ATTR_WO(win_switch); + static struct attribute *msc_output_attrs[] = { &dev_attr_wrap.attr, &dev_attr_mode.attr, &dev_attr_nr_pages.attr, + &dev_attr_win_switch.attr, NULL, }; -- cgit v1.2.3