[PATCH 1/2] drm: Add DRM-managed drm_mm_init()

[Michal Wajdeczko <michal.wajdeczko@intel.com>]

Add drmm_mm_init(), a helper that provides managed allocator cleanup.
The allocator will be cleaned up with the final reference of the DRM
device.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/drm_managed.c | 27 +++++++++++++++++++++++++++
 include/drm/drm_managed.h     |  3 +++
 2 files changed, 30 insertions(+)

diff --git a/drivers/gpu/drm/drm_managed.c b/drivers/gpu/drm/drm_managed.c
index 7646f67bda4e..2fb9656bada3 100644
--- a/drivers/gpu/drm/drm_managed.c
+++ b/drivers/gpu/drm/drm_managed.c
@@ -13,6 +13,7 @@
 #include <linux/spinlock.h>
 
 #include <drm/drm_device.h>
+#include <drm/drm_mm.h>
 #include <drm/drm_print.h>
 
 #include "drm_internal.h"
@@ -310,3 +311,29 @@ void __drmm_mutex_release(struct drm_device *dev, void *res)
 	mutex_destroy(lock);
 }
 EXPORT_SYMBOL(__drmm_mutex_release);
+
+static void __drmm_mm_takedown(struct drm_device *dev, void *res)
+{
+	struct drm_mm *mm = res;
+
+	drm_mm_takedown(mm);
+}
+
+/**
+ * drmm_mm_init - &drm_device managed drm_mm_init()
+ * @dev: DRM device
+ * @mm: the drm_mm structure to initialize
+ * @start: start of the range managed by @mm
+ * @size: end of the range managed by @mm
+ *
+ * This is a &drm_device managed version of drm_mm_init().
+ * The initialized allocator will be cleaned up on the final drm_dev_put().
+ *
+ * Return: 0 on success, or a negative errno code otherwise.
+ */
+int drmm_mm_init(struct drm_device *dev, struct drm_mm *mm, u64 start, u64 size)
+{
+	drm_mm_init(mm, start, size);
+	return drmm_add_action_or_reset(dev, __drmm_mm_takedown, mm);
+}
+EXPORT_SYMBOL(drmm_mm_init);
diff --git a/include/drm/drm_managed.h b/include/drm/drm_managed.h
index f547b09ca023..e8c2f29cb88a 100644
--- a/include/drm/drm_managed.h
+++ b/include/drm/drm_managed.h
@@ -8,6 +8,7 @@
 #include <linux/types.h>
 
 struct drm_device;
+struct drm_mm;
 struct mutex;
 
 typedef void (*drmres_release_t)(struct drm_device *dev, void *res);
@@ -127,4 +128,6 @@ void __drmm_mutex_release(struct drm_device *dev, void *res);
 	drmm_add_action_or_reset(dev, __drmm_mutex_release, lock);	     \
 })									     \
 
+int drmm_mm_init(struct drm_device *dev, struct drm_mm *mm, u64 start, u64 size);
+
 #endif
-- 
2.43.0