drm/i915: export error state ref handling

In preparation for sysfs error state access,
export ref error state ref counting interface.

Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index b64af15..eef4c01 100644 (file)
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -980,12 +980,30 @@ i915_error_state_write(struct file *filp,
        return cnt;
 }
 
+void i915_error_state_get(struct drm_device *dev,
+                         struct i915_error_state_file_priv *error_priv)
+{
+       struct drm_i915_private *dev_priv = dev->dev_private;
+       unsigned long flags;
+
+       spin_lock_irqsave(&dev_priv->gpu_error.lock, flags);
+       error_priv->error = dev_priv->gpu_error.first_error;
+       if (error_priv->error)
+               kref_get(&error_priv->error->ref);
+       spin_unlock_irqrestore(&dev_priv->gpu_error.lock, flags);
+
+}
+
+void i915_error_state_put(struct i915_error_state_file_priv *error_priv)
+{
+       if (error_priv->error)
+               kref_put(&error_priv->error->ref, i915_error_state_free);
+}
+
 static int i915_error_state_open(struct inode *inode, struct file *file)
 {
        struct drm_device *dev = inode->i_private;
-       drm_i915_private_t *dev_priv = dev->dev_private;
        struct i915_error_state_file_priv *error_priv;
-       unsigned long flags;
 
        error_priv = kzalloc(sizeof(*error_priv), GFP_KERNEL);
        if (!error_priv)
@@ -993,11 +1011,7 @@ static int i915_error_state_open(struct inode *inode, struct file *file)
 
        error_priv->dev = dev;
 
-       spin_lock_irqsave(&dev_priv->gpu_error.lock, flags);
-       error_priv->error = dev_priv->gpu_error.first_error;
-       if (error_priv->error)
-               kref_get(&error_priv->error->ref);
-       spin_unlock_irqrestore(&dev_priv->gpu_error.lock, flags);
+       i915_error_state_get(dev, error_priv);
 
        file->private_data = error_priv;
 
@@ -1008,8 +1022,7 @@ static int i915_error_state_release(struct inode *inode, struct file *file)
 {
        struct i915_error_state_file_priv *error_priv = file->private_data;
 
-       if (error_priv->error)
-               kref_put(&error_priv->error->ref, i915_error_state_free);
+       i915_error_state_put(error_priv);
        kfree(error_priv);
 
        return 0;

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 52fe976..bc4a84a 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1928,6 +1928,9 @@ __printf(2, 3)
 void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...);
 int i915_error_state_to_str(struct drm_i915_error_state_buf *estr,
                            const struct i915_error_state_file_priv *error);
+void i915_error_state_get(struct drm_device *dev,
+                         struct i915_error_state_file_priv *error_priv);
+void i915_error_state_put(struct i915_error_state_file_priv *error_priv);
 
 /* i915_suspend.c */
 extern int i915_save_state(struct drm_device *dev);