From 07f4948bfc60288f179dafcf4ea0c0c8f9a558fd Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Fri, 27 Oct 2023 13:58:12 +0200
Subject: [PATCH] xf86drmMode: add drmModeCloseFB()

Add a wrapper for the new CLOSEFB IOCTL, to close a framebuffer
without implicitly disabling planes or CRTCs.

See https://lore.kernel.org/dri-devel/20231020101926.145327-2-contact@emersion.fr/

Signed-off-by: Simon Ser <contact@emersion.fr>
---
 core-symbols.txt |  1 +
 xf86drmMode.c    | 10 ++++++++++
 xf86drmMode.h    |  7 +++++++
 3 files changed, 18 insertions(+)

diff --git a/core-symbols.txt b/core-symbols.txt
index 8b22f3a1..766c342d 100644
--- a/core-symbols.txt
+++ b/core-symbols.txt
@@ -104,6 +104,7 @@ drmModeAtomicGetCursor
 drmModeAtomicMerge
 drmModeAtomicSetCursor
 drmModeAttachMode
+drmModeCloseFB
 drmModeConnectorGetPossibleCrtcs
 drmModeConnectorSetProperty
 drmModeCreateDumbBuffer
diff --git a/xf86drmMode.c b/xf86drmMode.c
index 65d54d78..a4873a0f 100644
--- a/xf86drmMode.c
+++ b/xf86drmMode.c
@@ -320,6 +320,16 @@ drm_public int drmModeRmFB(int fd, uint32_t bufferId)
 	return DRM_IOCTL(fd, DRM_IOCTL_MODE_RMFB, &bufferId);
 }
 
+drm_public int drmModeCloseFB(int fd, uint32_t buffer_id)
+{
+	struct drm_mode_closefb closefb;
+
+	memclear(closefb);
+	closefb.fb_id = buffer_id;
+
+	return DRM_IOCTL(fd, DRM_IOCTL_MODE_CLOSEFB, &closefb);
+}
+
 drm_public drmModeFBPtr drmModeGetFB(int fd, uint32_t buf)
 {
 	struct drm_mode_fb_cmd info;
diff --git a/xf86drmMode.h b/xf86drmMode.h
index b6410ab8..08487887 100644
--- a/xf86drmMode.h
+++ b/xf86drmMode.h
@@ -314,6 +314,13 @@ int drmModeAddFB2WithModifiers(int fd, uint32_t width, uint32_t height,
  */
 extern int drmModeRmFB(int fd, uint32_t bufferId);
 
+/**
+ * Close a framebuffer.
+ *
+ * Same as drmModeRmFB(), except it doesn't implicitly disable planes and CRTCs.
+ */
+extern int drmModeCloseFB(int fd, uint32_t buffer_id);
+
 /**
  * Mark a region of a framebuffer as dirty.
  */