[06/34] drm: Convert magic_map to XArray

Commit Message

Matthew Wilcox (Oracle) Feb. 21, 2019, 6:41 p.m. UTC

Signed-off-by: Matthew Wilcox <[e-mail]>
---
 drivers/gpu/drm/drm_auth.c | 18 ++++++++----------
 include/drm/drm_auth.h     |  5 ++---
 2 files changed, 10 insertions(+), 13 deletions(-)

Patch

diff --git a/drivers/gpu/drm/drm_auth.c b/drivers/gpu/drm/drm_auth.c
index 1669c42c40ed..268189e9e2e0 100644
--- a/drivers/gpu/drm/drm_auth.c
+++ b/drivers/gpu/drm/drm_auth.c
@@ -62,17 +62,16 @@  int drm_getmagic(struct drm_device *dev, void *data, struct drm_file *file_priv)
 
 	mutex_lock(&dev->master_mutex);
 	if (!file_priv->magic) {
-		ret = idr_alloc(&file_priv->master->magic_map, file_priv,
-				1, 0, GFP_KERNEL);
-		if (ret >= 0)
-			file_priv->magic = ret;
+		ret = xa_alloc(&file_priv->master->magic_map,
+				&file_priv->magic, file_priv,
+				xa_limit_31b, GFP_KERNEL);
 	}
 	auth->magic = file_priv->magic;
 	mutex_unlock(&dev->master_mutex);
 
 	DRM_DEBUG("%u\n", auth->magic);
 
-	return ret < 0 ? ret : 0;
+	return ret;
 }
 
 int drm_authmagic(struct drm_device *dev, void *data,
@@ -84,10 +83,10 @@  int drm_authmagic(struct drm_device *dev, void *data,
 	DRM_DEBUG("%u\n", auth->magic);
 
 	mutex_lock(&dev->master_mutex);
-	file = idr_find(&file_priv->master->magic_map, auth->magic);
+	file = xa_load(&file_priv->master->magic_map, auth->magic);
 	if (file) {
 		file->authenticated = 1;
-		idr_replace(&file_priv->master->magic_map, NULL, auth->magic);
+		xa_store(&file_priv->master->magic_map, auth->magic, NULL, 0);
 	}
 	mutex_unlock(&dev->master_mutex);
 
@@ -105,7 +104,7 @@  struct drm_master *drm_master_create(struct drm_device *dev)
 	kref_init(&master->refcount);
 	spin_lock_init(&master->lock.spinlock);
 	init_waitqueue_head(&master->lock.lock_queue);
-	idr_init(&master->magic_map);
+	xa_init_flags(&master->magic_map, XA_FLAGS_ALLOC1);
 	master->dev = dev;
 
 	/* initialize the tree of output resource lessees */
@@ -269,7 +268,7 @@  void drm_master_release(struct drm_file *file_priv)
 
 	mutex_lock(&dev->master_mutex);
 	if (file_priv->magic)
-		idr_remove(&file_priv->master->magic_map, file_priv->magic);
+		xa_erase(&file_priv->master->magic_map, file_priv->magic);
 
 	if (!drm_is_current_master(file_priv))
 		goto out;
@@ -348,7 +347,6 @@  static void drm_master_destroy(struct kref *kref)
 
 	drm_legacy_master_rmmaps(dev, master);
 
-	idr_destroy(&master->magic_map);
 	idr_destroy(&master->leases);
 	idr_destroy(&master->lessee_idr);
 
diff --git a/include/drm/drm_auth.h b/include/drm/drm_auth.h
index 86bff9841b54..c719fe375967 100644
--- a/include/drm/drm_auth.h
+++ b/include/drm/drm_auth.h
@@ -76,10 +76,9 @@  struct drm_master {
 	 */
 	int unique_len;
 	/**
-	 * @magic_map: Map of used authentication tokens. Protected by
-	 * &drm_device.master_mutex.
+	 * @magic_map: Map of used authentication tokens.
 	 */
-	struct idr magic_map;
+	struct xarray magic_map;
 	struct drm_lock_data lock;
 	void *driver_priv;