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[PATCH 2/7] drm/drv: Add drmm cgroup registration for dev cgroups.

Maarten Lankhorst posted 7 patches 1 month ago
[PATCH 2/7] drm/drv: Add drmm cgroup registration for dev cgroups.
Posted by Maarten Lankhorst 1 month ago 
From: Maxime Ripard <mripard@kernel.org>

Drivers will need to register a cgroup device at probe time, so let's
give them a drm-managed helper.

Signed-off-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/drm_drv.c | 21 +++++++++++++++++++++
 include/drm/drm_drv.h     |  4 ++++
 2 files changed, 25 insertions(+)

diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index c2c172eb25df7..251d1d69b09c5 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -26,6 +26,7 @@
  * DEALINGS IN THE SOFTWARE.
  */
 
+#include <linux/cgroup_dev.h>
 #include <linux/debugfs.h>
 #include <linux/fs.h>
 #include <linux/module.h>
@@ -820,6 +821,26 @@ void drm_dev_put(struct drm_device *dev)
 }
 EXPORT_SYMBOL(drm_dev_put);
 
+static inline void drmm_cg_unregister_device(struct drm_device *dev, void *arg)
+{
+	dev_cgroup_unregister_device(arg);
+}
+
+int drmm_cgroup_register_device(struct drm_device *dev,
+				struct dev_cgroup_device *cgdev)
+{
+	int ret;
+	char dev_name[32];
+
+	snprintf(dev_name, sizeof(dev_name), "drm/%s", dev->unique);
+	ret = dev_cgroup_register_device(cgdev, dev_name);
+	if (ret)
+		return ret;
+
+	return drmm_add_action_or_reset(dev, drmm_cg_unregister_device, cgdev);
+}
+EXPORT_SYMBOL_GPL(drmm_cgroup_register_device);
+
 static int create_compat_control_link(struct drm_device *dev)
 {
 	struct drm_minor *minor;
diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
index 1bbbcb8e2d231..3e83c7ce7f2d0 100644
--- a/include/drm/drm_drv.h
+++ b/include/drm/drm_drv.h
@@ -34,6 +34,7 @@
 
 #include <drm/drm_device.h>
 
+struct dev_cgroup_device;
 struct drm_fb_helper;
 struct drm_fb_helper_surface_size;
 struct drm_file;
@@ -438,6 +439,9 @@ void *__devm_drm_dev_alloc(struct device *parent,
 			   const struct drm_driver *driver,
 			   size_t size, size_t offset);
 
+int drmm_cgroup_register_device(struct drm_device *dev,
+				struct dev_cgroup_device *cgdev);
+
 /**
  * devm_drm_dev_alloc - Resource managed allocation of a &drm_device instance
  * @parent: Parent device object
-- 
2.45.2
Re: [PATCH 2/7] drm/drv: Add drmm cgroup registration for dev cgroups.
Posted by kernel test robot 1 month ago 
Hi Maarten,

kernel test robot noticed the following build errors:

[auto build test ERROR on drm/drm-next]
[also build test ERROR on drm-exynos/exynos-drm-next next-20241024]
[cannot apply to tj-cgroup/for-next drm-xe/drm-xe-next akpm-mm/mm-everything drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-misc/drm-misc-next drm-tip/drm-tip linus/master v6.12-rc4]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Maarten-Lankhorst/kernel-cgroup-Add-dev-memory-accounting-cgroup/20241023-155504
base:   git://anongit.freedesktop.org/drm/drm drm-next
patch link:    https://lore.kernel.org/r/20241023075302.27194-3-maarten.lankhorst%40linux.intel.com
patch subject: [PATCH 2/7] drm/drv: Add drmm cgroup registration for dev cgroups.
config: arm64-randconfig-002-20241024 (https://download.01.org/0day-ci/archive/20241024/202410242324.adtg6g0w-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241024/202410242324.adtg6g0w-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410242324.adtg6g0w-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/gpu/drm/drm_drv.c:29:
   include/linux/cgroup_dev.h:61:12: error: two or more data types in declaration specifiers
      61 | static int int dev_cgroup_try_charge(struct dev_cgroup_device *cgdev,
         |            ^~~
   include/linux/cgroup_dev.h:65:1: error: expected identifier or '(' before '{' token
      65 | {
         | ^
>> include/linux/cgroup_dev.h:61:16: error: 'dev_cgroup_try_charge' declared 'static' but never defined [-Werror=unused-function]
      61 | static int int dev_cgroup_try_charge(struct dev_cgroup_device *cgdev,
         |                ^~~~~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors


vim +61 include/linux/cgroup_dev.h

487073b1855ef4 Maarten Lankhorst 2024-10-23  60  
487073b1855ef4 Maarten Lankhorst 2024-10-23 @61  static int int dev_cgroup_try_charge(struct dev_cgroup_device *cgdev,
487073b1855ef4 Maarten Lankhorst 2024-10-23  62  				     u32 index, u64 size,
487073b1855ef4 Maarten Lankhorst 2024-10-23  63  				     struct dev_cgroup_pool_state **ret_pool,
487073b1855ef4 Maarten Lankhorst 2024-10-23  64  				     struct dev_cgroup_pool_state **ret_limit_pool);
487073b1855ef4 Maarten Lankhorst 2024-10-23  65  {
487073b1855ef4 Maarten Lankhorst 2024-10-23  66  	*ret_pool = NULL;
487073b1855ef4 Maarten Lankhorst 2024-10-23  67  
487073b1855ef4 Maarten Lankhorst 2024-10-23  68  	if (ret_limit_pool)
487073b1855ef4 Maarten Lankhorst 2024-10-23  69  		*ret_limit_pool = NULL;
487073b1855ef4 Maarten Lankhorst 2024-10-23  70  
487073b1855ef4 Maarten Lankhorst 2024-10-23  71  	return 0;
487073b1855ef4 Maarten Lankhorst 2024-10-23  72  }
487073b1855ef4 Maarten Lankhorst 2024-10-23  73  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
Re: [PATCH 2/7] drm/drv: Add drmm cgroup registration for dev cgroups.
Posted by kernel test robot 1 month ago 
Hi Maarten,

kernel test robot noticed the following build errors:

[auto build test ERROR on drm/drm-next]
[also build test ERROR on drm-exynos/exynos-drm-next next-20241024]
[cannot apply to tj-cgroup/for-next drm-xe/drm-xe-next akpm-mm/mm-everything drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-misc/drm-misc-next drm-tip/drm-tip linus/master v6.12-rc4]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Maarten-Lankhorst/kernel-cgroup-Add-dev-memory-accounting-cgroup/20241023-155504
base:   git://anongit.freedesktop.org/drm/drm drm-next
patch link:    https://lore.kernel.org/r/20241023075302.27194-3-maarten.lankhorst%40linux.intel.com
patch subject: [PATCH 2/7] drm/drv: Add drmm cgroup registration for dev cgroups.
config: x86_64-rhel-8.3 (https://download.01.org/0day-ci/archive/20241024/202410241806.p6u3FcGS-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241024/202410241806.p6u3FcGS-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410241806.p6u3FcGS-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

   In file included from drivers/gpu/drm/drm_drv.c:29:
>> include/linux/cgroup_dev.h:61:12: error: two or more data types in declaration specifiers
      61 | static int int dev_cgroup_try_charge(struct dev_cgroup_device *cgdev,
         |            ^~~
>> include/linux/cgroup_dev.h:65:1: error: expected identifier or '(' before '{' token
      65 | {
         | ^
>> include/linux/cgroup_dev.h:61:16: warning: 'dev_cgroup_try_charge' declared 'static' but never defined [-Wunused-function]
      61 | static int int dev_cgroup_try_charge(struct dev_cgroup_device *cgdev,
         |                ^~~~~~~~~~~~~~~~~~~~~


vim +61 include/linux/cgroup_dev.h

487073b1855ef4 Maarten Lankhorst 2024-10-23  60  
487073b1855ef4 Maarten Lankhorst 2024-10-23 @61  static int int dev_cgroup_try_charge(struct dev_cgroup_device *cgdev,
487073b1855ef4 Maarten Lankhorst 2024-10-23  62  				     u32 index, u64 size,
487073b1855ef4 Maarten Lankhorst 2024-10-23  63  				     struct dev_cgroup_pool_state **ret_pool,
487073b1855ef4 Maarten Lankhorst 2024-10-23  64  				     struct dev_cgroup_pool_state **ret_limit_pool);
487073b1855ef4 Maarten Lankhorst 2024-10-23 @65  {
487073b1855ef4 Maarten Lankhorst 2024-10-23  66  	*ret_pool = NULL;
487073b1855ef4 Maarten Lankhorst 2024-10-23  67  
487073b1855ef4 Maarten Lankhorst 2024-10-23  68  	if (ret_limit_pool)
487073b1855ef4 Maarten Lankhorst 2024-10-23  69  		*ret_limit_pool = NULL;
487073b1855ef4 Maarten Lankhorst 2024-10-23  70  
487073b1855ef4 Maarten Lankhorst 2024-10-23  71  	return 0;
487073b1855ef4 Maarten Lankhorst 2024-10-23  72  }
487073b1855ef4 Maarten Lankhorst 2024-10-23  73  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
Re: [PATCH 2/7] drm/drv: Add drmm cgroup registration for dev cgroups.
Posted by Jani Nikula 1 month ago 
On Wed, 23 Oct 2024, Maarten Lankhorst <maarten.lankhorst@linux.intel.com> wrote:
> From: Maxime Ripard <mripard@kernel.org>
>
> Drivers will need to register a cgroup device at probe time, so let's
> give them a drm-managed helper.
>
> Signed-off-by: Maxime Ripard <mripard@kernel.org>
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> ---
>  drivers/gpu/drm/drm_drv.c | 21 +++++++++++++++++++++
>  include/drm/drm_drv.h     |  4 ++++
>  2 files changed, 25 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index c2c172eb25df7..251d1d69b09c5 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -26,6 +26,7 @@
>   * DEALINGS IN THE SOFTWARE.
>   */
>  
> +#include <linux/cgroup_dev.h>
>  #include <linux/debugfs.h>
>  #include <linux/fs.h>
>  #include <linux/module.h>
> @@ -820,6 +821,26 @@ void drm_dev_put(struct drm_device *dev)
>  }
>  EXPORT_SYMBOL(drm_dev_put);
>  
> +static inline void drmm_cg_unregister_device(struct drm_device *dev, void *arg)

Nitpick, inline in .c files is mostly useless, just use static and let
the compiler do its job.

BR,
Jani.

> +{
> +	dev_cgroup_unregister_device(arg);
> +}
> +
> +int drmm_cgroup_register_device(struct drm_device *dev,
> +				struct dev_cgroup_device *cgdev)
> +{
> +	int ret;
> +	char dev_name[32];
> +
> +	snprintf(dev_name, sizeof(dev_name), "drm/%s", dev->unique);
> +	ret = dev_cgroup_register_device(cgdev, dev_name);
> +	if (ret)
> +		return ret;
> +
> +	return drmm_add_action_or_reset(dev, drmm_cg_unregister_device, cgdev);
> +}
> +EXPORT_SYMBOL_GPL(drmm_cgroup_register_device);
> +
>  static int create_compat_control_link(struct drm_device *dev)
>  {
>  	struct drm_minor *minor;
> diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
> index 1bbbcb8e2d231..3e83c7ce7f2d0 100644
> --- a/include/drm/drm_drv.h
> +++ b/include/drm/drm_drv.h
> @@ -34,6 +34,7 @@
>  
>  #include <drm/drm_device.h>
>  
> +struct dev_cgroup_device;
>  struct drm_fb_helper;
>  struct drm_fb_helper_surface_size;
>  struct drm_file;
> @@ -438,6 +439,9 @@ void *__devm_drm_dev_alloc(struct device *parent,
>  			   const struct drm_driver *driver,
>  			   size_t size, size_t offset);
>  
> +int drmm_cgroup_register_device(struct drm_device *dev,
> +				struct dev_cgroup_device *cgdev);
> +
>  /**
>   * devm_drm_dev_alloc - Resource managed allocation of a &drm_device instance
>   * @parent: Parent device object

-- 
Jani Nikula, Intel

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