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path: root/drivers/hwtracing/intel_th/msu.c
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Diffstat (limited to 'drivers/hwtracing/intel_th/msu.c')
-rw-r--r--drivers/hwtracing/intel_th/msu.c49
1 files changed, 46 insertions, 3 deletions
diff --git a/drivers/hwtracing/intel_th/msu.c b/drivers/hwtracing/intel_th/msu.c
index 255f8f41c8ff..3a77551fb4fc 100644
--- a/drivers/hwtracing/intel_th/msu.c
+++ b/drivers/hwtracing/intel_th/msu.c
@@ -138,6 +138,7 @@ struct msc {
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;
@@ -154,10 +155,13 @@ struct msc {
struct list_head iter_list;
+ bool stop_on_full;
+
/* config */
unsigned int enabled : 1,
wrap : 1,
- do_irq : 1;
+ do_irq : 1,
+ multi_is_broken : 1;
unsigned int mode;
unsigned int burst_len;
unsigned int index;
@@ -1665,7 +1669,7 @@ static int intel_th_msc_init(struct msc *msc)
{
atomic_set(&msc->user_count, -1);
- msc->mode = MSC_MODE_MULTI;
+ msc->mode = msc->multi_is_broken ? MSC_MODE_SINGLE : MSC_MODE_MULTI;
mutex_init(&msc->buf_mutex);
INIT_LIST_HEAD(&msc->win_list);
INIT_LIST_HEAD(&msc->iter_list);
@@ -1717,6 +1721,10 @@ void intel_th_msc_window_unlock(struct device *dev, struct sg_table *sgt)
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);
@@ -1757,7 +1765,11 @@ static irqreturn_t intel_th_msc_interrupt(struct intel_th_device *thdev)
/* 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;
}
@@ -1877,6 +1889,9 @@ mode_store(struct device *dev, struct device_attribute *attr, const char *buf,
return -EINVAL;
found:
+ if (i == MSC_MODE_MULTI && msc->multi_is_broken)
+ return -EOPNOTSUPP;
+
mutex_lock(&msc->buf_mutex);
ret = 0;
@@ -2047,11 +2062,36 @@ win_switch_store(struct device *dev, struct device_attribute *attr,
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,
};
@@ -2083,6 +2123,9 @@ static int intel_th_msc_probe(struct intel_th_device *thdev)
if (!res)
msc->do_irq = 1;
+ if (INTEL_TH_CAP(to_intel_th(thdev), multi_is_broken))
+ msc->multi_is_broken = 1;
+
msc->index = thdev->id;
msc->thdev = thdev;