From fc2b834365060574825c1ef6a153d9afb3c0c084 Mon Sep 17 00:00:00 2001
From: Jeffy Chen <jeffy.chen@rock-chips.com>
Date: Wed, 12 Jan 2022 11:42:19 +0800
Subject: [PATCH 4/4] HACK: Bypass auth APIs by default

There're hacks in Rockchip's BSP kernels to ignore drm auth, so we can
bypass the related drm auth APIs here.

Bypass these auth APIs:
drmGetBusid, drmSetBusid, drmGetMagic, drmAuthMagic,
drmSetInterfaceVersion, drmSetMaster, drmDropMaster.

Set these environments to enable:
"DRM_GET_BUSID", "DRM_SET_BUSID", "DRM_GET_MAGIC", "DRM_AUTH_MAGIC",
"DRM_SET_VERSION", "DRM_SET_MASTER", "DRM_DROP_MASTER".

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
---
 xf86drm.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/xf86drm.c b/xf86drm.c
index b1ae6bf..904ea8c 100644
--- a/xf86drm.c
+++ b/xf86drm.c
@@ -1507,6 +1507,9 @@ drm_public char *drmGetBusid(int fd)
 {
     drm_unique_t u;
 
+    if (!getenv("DRM_GET_BUSID"))
+        return strdup("");
+
     memclear(u);
 
     if (drmIoctl(fd, DRM_IOCTL_GET_UNIQUE, &u))
@@ -1538,6 +1541,9 @@ drm_public int drmSetBusid(int fd, const char *busid)
 {
     drm_unique_t u;
 
+    if (!getenv("DRM_SET_BUSID"))
+        return 0;
+
     memclear(u);
     u.unique     = (char *)busid;
     u.unique_len = strlen(busid);
@@ -1552,6 +1558,9 @@ drm_public int drmGetMagic(int fd, drm_magic_t * magic)
 {
     drm_auth_t auth;
 
+    if (!getenv("DRM_GET_MAGIC"))
+        return 0;
+
     memclear(auth);
 
     *magic = 0;
@@ -1565,6 +1574,9 @@ drm_public int drmAuthMagic(int fd, drm_magic_t magic)
 {
     drm_auth_t auth;
 
+    if (!getenv("DRM_AUTH_MAGIC"))
+        return 0;
+
     memclear(auth);
     auth.magic = magic;
     if (drmIoctl(fd, DRM_IOCTL_AUTH_MAGIC, &auth))
@@ -3063,6 +3075,9 @@ drm_public int drmSetInterfaceVersion(int fd, drmSetVersion *version)
     int retcode = 0;
     drm_set_version_t sv;
 
+    if (!getenv("DRM_SET_VERSION"))
+        return 0;
+
     memclear(sv);
     sv.drm_di_major = version->drm_di_major;
     sv.drm_di_minor = version->drm_di_minor;
@@ -3261,11 +3276,17 @@ drm_public void drmCloseOnce(int fd)
 
 drm_public int drmSetMaster(int fd)
 {
-        return drmIoctl(fd, DRM_IOCTL_SET_MASTER, NULL);
+	if (!getenv("DRM_SET_MASTER"))
+		return 0;
+
+	return drmIoctl(fd, DRM_IOCTL_SET_MASTER, NULL);
 }
 
 drm_public int drmDropMaster(int fd)
 {
+	if (!getenv("DRM_DROP_MASTER"))
+		return 0;
+
         return drmIoctl(fd, DRM_IOCTL_DROP_MASTER, NULL);
 }
 
-- 
2.20.1