提交 93b525dc 编写于 作者: D Daniel Vetter 提交者: Keith Packard

drm/i915: fixup forcewake spinlock fallout in drpc debugfs function

My forcewake spinlock patches have a functional conflict with Ben
Widawsky's gen6 drpc support for debugfs. Result was a benign warning
about trying to read an non-atomic variabla with atomic_read.

Note that the entire check is racy anyway and purely informational.
Also update it to reflect the forcewake voodoo changes, the kernel can
now also hold onto a forcewake reference for longer times.
Signed-Off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: NBen Widawsky <ben@bwidawsk.net>
Signed-off-by: NKeith Packard <keithp@keithp.com>
上级 48467a92
......@@ -1075,6 +1075,7 @@ static int gen6_drpc_info(struct seq_file *m)
struct drm_device *dev = node->minor->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 rpmodectl1, gt_core_status, rcctl1;
unsigned forcewake_count;
int count=0, ret;
......@@ -1082,9 +1083,13 @@ static int gen6_drpc_info(struct seq_file *m)
if (ret)
return ret;
if (atomic_read(&dev_priv->forcewake_count)) {
seq_printf(m, "RC information inaccurate because userspace "
"holds a reference \n");
spin_lock_irq(&dev_priv->gt_lock);
forcewake_count = dev_priv->forcewake_count;
spin_unlock_irq(&dev_priv->gt_lock);
if (forcewake_count) {
seq_printf(m, "RC information inaccurate because somebody "
"holds a forcewake reference \n");
} else {
/* NB: we cannot use forcewake, else we read the wrong values */
while (count++ < 50 && (I915_READ_NOTRACE(FORCEWAKE_ACK) & 1))
......
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