linux-kernel - [PATCH 1/2] drm/managed: Add drmm_release

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Message-ID: <20231129221412.1180549-2-michal.winiarski@intel.com>
Date:   Wed, 29 Nov 2023 23:14:11 +0100
From:   Michał Winiarski <michal.winiarski@...el.com>
To:     <intel-xe@...ts.freedesktop.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
CC:     Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Michal Wajdeczko <michal.wajdeczko@...el.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Maíra Canal <mcanal@...lia.com>,
        Michał Winiarski <michal.winiarski@...el.com>
Subject: [PATCH 1/2] drm/managed: Add drmm_release_action

Similar to devres equivalent, it allows to call the "release" action
directly and remove the resource from the managed resources list.

Signed-off-by: Michał Winiarski <michal.winiarski@...el.com>
---
 drivers/gpu/drm/drm_managed.c | 39 +++++++++++++++++++++++++++++++++++
 include/drm/drm_managed.h     |  4 ++++
 2 files changed, 43 insertions(+)

diff --git a/drivers/gpu/drm/drm_managed.c b/drivers/gpu/drm/drm_managed.c
index bcd111404b128..7646f67bda4e4 100644
--- a/drivers/gpu/drm/drm_managed.c
+++ b/drivers/gpu/drm/drm_managed.c
@@ -176,6 +176,45 @@ int __drmm_add_action_or_reset(struct drm_device *dev,
 }
 EXPORT_SYMBOL(__drmm_add_action_or_reset);
 
+/**
+ * drmm_release_action - release a managed action from a &drm_device
+ * @dev: DRM device
+ * @action: function which would be called when @dev is released
+ * @data: opaque pointer, passed to @action
+ *
+ * This function calls the @action previously added by drmm_add_action()
+ * immediately.
+ * The @action is removed from the list of cleanup actions for @dev,
+ * which means that it won't be called in the final drm_dev_put().
+ */
+void drmm_release_action(struct drm_device *dev,
+			 drmres_release_t action,
+			 void *data)
+{
+	struct drmres *dr_match = NULL, *dr;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->managed.lock, flags);
+	list_for_each_entry_reverse(dr, &dev->managed.resources, node.entry) {
+		if (dr->node.release == action) {
+			if (!data || (data && *(void **)dr->data == data)) {
+				dr_match = dr;
+				del_dr(dev, dr_match);
+				break;
+			}
+		}
+	}
+	spin_unlock_irqrestore(&dev->managed.lock, flags);
+
+	if (WARN_ON(!dr_match))
+		return;
+
+	action(dev, data);
+
+	free_dr(dr_match);
+}
+EXPORT_SYMBOL(drmm_release_action);
+
 /**
  * drmm_kmalloc - &drm_device managed kmalloc()
  * @dev: DRM device
diff --git a/include/drm/drm_managed.h b/include/drm/drm_managed.h
index ad08f834af408..f547b09ca0239 100644
--- a/include/drm/drm_managed.h
+++ b/include/drm/drm_managed.h
@@ -45,6 +45,10 @@ int __must_check __drmm_add_action_or_reset(struct drm_device *dev,
 					    drmres_release_t action,
 					    void *data, const char *name);
 
+void drmm_release_action(struct drm_device *dev,
+			 drmres_release_t action,
+			 void *data);
+
 void *drmm_kmalloc(struct drm_device *dev, size_t size, gfp_t gfp) __malloc;
 
 /**
-- 
2.43.0