From: Tvrtko Ursulin <tvrtko.ursu...@intel.com>
Skeleton controller without any functionality.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursu...@igalia.com>
---
include/linux/cgroup_drm.h | 7 +++++
include/linux/cgroup_subsys.h | 4 +++
init/Kconfig | 5 +++
kernel/cgroup/Makefile | 1 +
kernel/cgroup/drm.c | 58 +++++++++++++++++++++++++++++++++++
5 files changed, 75 insertions(+)
create mode 100644 include/linux/cgroup_drm.h
create mode 100644 kernel/cgroup/drm.c
diff --git a/include/linux/cgroup_drm.h b/include/linux/cgroup_drm.h
new file mode 100644
index 000000000000..3e51fe517791
--- /dev/null
+++ b/include/linux/cgroup_drm.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2025 Valve Corporation */
+
+#ifndef _CGROUP_DRM_H
+#define _CGROUP_DRM_H
+
+#endif /* _CGROUP_DRM_H */
diff --git a/include/linux/cgroup_subsys.h b/include/linux/cgroup_subsys.h
index 3fd0bcbf3080..2ad172c9fba2 100644
--- a/include/linux/cgroup_subsys.h
+++ b/include/linux/cgroup_subsys.h
@@ -69,6 +69,10 @@ SUBSYS(misc)
SUBSYS(dmem)
#endif
+#if IS_ENABLED(CONFIG_CGROUP_DRM)
+SUBSYS(drm)
+#endif
+
/*
* The following subsystems are not supported on the default hierarchy.
*/
diff --git a/init/Kconfig b/init/Kconfig
index 63f5974b9fa6..02789e15c6e6 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1157,6 +1157,11 @@ config CGROUP_DMEM
As an example, it allows you to restrict VRAM usage for applications
in the DRM subsystem.
+config CGROUP_DRM
+ bool "DRM controller"
+ help
+ Provides the DRM subsystem controller.
+
config CGROUP_FREEZER
bool "Freezer controller"
help
diff --git a/kernel/cgroup/Makefile b/kernel/cgroup/Makefile
index ede31601a363..c39799312cfd 100644
--- a/kernel/cgroup/Makefile
+++ b/kernel/cgroup/Makefile
@@ -8,4 +8,5 @@ obj-$(CONFIG_CPUSETS) += cpuset.o
obj-$(CONFIG_CPUSETS_V1) += cpuset-v1.o
obj-$(CONFIG_CGROUP_MISC) += misc.o
obj-$(CONFIG_CGROUP_DMEM) += dmem.o
+obj-$(CONFIG_CGROUP_DRM) += drm.o
obj-$(CONFIG_CGROUP_DEBUG) += debug.o
diff --git a/kernel/cgroup/drm.c b/kernel/cgroup/drm.c
new file mode 100644
index 000000000000..55947a009e04
--- /dev/null
+++ b/kernel/cgroup/drm.c
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2025 Valve Corporation */
+
+#include <linux/cgroup.h>
+#include <linux/cgroup_drm.h>
+#include <linux/slab.h>
+
+struct drm_cgroup_state {
+ struct cgroup_subsys_state css;
+};
+
+struct drm_root_cgroup_state {
+ struct drm_cgroup_state drmcs;
+};
+
+static struct drm_root_cgroup_state root_drmcs;
+
+static inline struct drm_cgroup_state *
+css_to_drmcs(struct cgroup_subsys_state *css)
+{
+ return container_of(css, struct drm_cgroup_state, css);
+}
+
+static void drmcs_free(struct cgroup_subsys_state *css)
+{
+ struct drm_cgroup_state *drmcs = css_to_drmcs(css);
+
+ if (drmcs != &root_drmcs.drmcs)
+ kfree(drmcs);
+}
+
+static struct cgroup_subsys_state *
+drmcs_alloc(struct cgroup_subsys_state *parent_css)
+{
+ struct drm_cgroup_state *drmcs;
+
+ if (!parent_css) {
+ drmcs = &root_drmcs.drmcs;
+ } else {
+ drmcs = kzalloc(sizeof(*drmcs), GFP_KERNEL);
+ if (!drmcs)
+ return ERR_PTR(-ENOMEM);
+ }
+
+ return &drmcs->css;
+}
+
+struct cftype files[] = {
+ { } /* Zero entry terminates. */
+};
+
+struct cgroup_subsys drm_cgrp_subsys = {
+ .css_alloc = drmcs_alloc,
+ .css_free = drmcs_free,
+ .early_init = false,
+ .legacy_cftypes = files,
+ .dfl_cftypes = files,
+};
--
2.48.0
