[Intel-gfx] [PATCH] drm/i915/debugfs: Take runtime_pm ref for sseu

[David Weinehall]

When reading the SSEU statistics, we need to call
intel_runtime_pm_get() first, otherwise we might end up
triggering "Device suspended during HW access".

Signed-off-by: David Weinehall <david.weinehall at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 9aa62c5b5f65..531ca0221c7f 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -5238,7 +5238,8 @@ static void broadwell_sseu_device_status(struct drm_device *dev,
 static int i915_sseu_status(struct seq_file *m, void *unused)
 {
 	struct drm_info_node *node = (struct drm_info_node *) m->private;
-	struct drm_device *dev = node->minor->dev;
+	struct drm_i915_private *dev_priv = to_i915(node->minor->dev);
+	struct drm_device *dev = &dev_priv->drm;
 	struct sseu_dev_status stat;
 
 	if (INTEL_INFO(dev)->gen < 8)
@@ -5268,6 +5269,9 @@ static int i915_sseu_status(struct seq_file *m, void *unused)
 
 	seq_puts(m, "SSEU Device Status\n");
 	memset(&stat, 0, sizeof(stat));
+
+	intel_runtime_pm_get(dev_priv);
+
 	if (IS_CHERRYVIEW(dev)) {
 		cherryview_sseu_device_status(dev, &stat);
 	} else if (IS_BROADWELL(dev)) {
@@ -5275,6 +5279,9 @@ static int i915_sseu_status(struct seq_file *m, void *unused)
 	} else if (INTEL_INFO(dev)->gen >= 9) {
 		gen9_sseu_device_status(dev, &stat);
 	}
+
+	intel_runtime_pm_put(dev_priv);
+
 	seq_printf(m, "  Enabled Slice Total: %u\n",
 		   stat.slice_total);
 	seq_printf(m, "  Enabled Subslice Total: %u\n",
-- 
2.8.1