diff mbox series

[v7,02/15] cgroup/misc: Export APIs for SGX driver

Message ID 20240122172048.11953-3-haitao.huang@linux.intel.com (mailing list archive)
State New, archived
Headers show
Series Add Cgroup support for SGX EPC memory | expand

Commit Message

Haitao Huang Jan. 22, 2024, 5:20 p.m. UTC
From: Kristen Carlson Accardi <kristen@linux.intel.com>

The SGX EPC cgroup will reclaim EPC pages when a usage in a cgroup
reaches its or ancestor's limit. This requires a walk from the current
cgroup up to the root similar to misc_cg_try_charge(). Export
misc_cg_parent() to enable this walk.

The SGX driver may also need start a global level reclamation from the
root. Export misc_cg_root() for the SGX driver to access.

Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com>
Co-developed-by: Haitao Huang <haitao.huang@linux.intel.com>
Signed-off-by: Haitao Huang <haitao.huang@linux.intel.com>
---
V6:
- Make commit messages more concise and split the original patch into two(Kai)
---
 include/linux/misc_cgroup.h | 24 ++++++++++++++++++++++++
 kernel/cgroup/misc.c        | 21 ++++++++-------------
 2 files changed, 32 insertions(+), 13 deletions(-)

Comments

Jarkko Sakkinen Jan. 22, 2024, 8:17 p.m. UTC | #1
On Mon Jan 22, 2024 at 7:20 PM EET, Haitao Huang wrote:
> From: Kristen Carlson Accardi <kristen@linux.intel.com>
>
> The SGX EPC cgroup will reclaim EPC pages when a usage in a cgroup
> reaches its or ancestor's limit. This requires a walk from the current
> cgroup up to the root similar to misc_cg_try_charge(). Export
> misc_cg_parent() to enable this walk.
>
> The SGX driver may also need start a global level reclamation from the
> root. Export misc_cg_root() for the SGX driver to access.
>
> Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com>
> Co-developed-by: Haitao Huang <haitao.huang@linux.intel.com>
> Signed-off-by: Haitao Huang <haitao.huang@linux.intel.com>
> ---
> V6:
> - Make commit messages more concise and split the original patch into two(Kai)
> ---
>  include/linux/misc_cgroup.h | 24 ++++++++++++++++++++++++
>  kernel/cgroup/misc.c        | 21 ++++++++-------------
>  2 files changed, 32 insertions(+), 13 deletions(-)
>
> diff --git a/include/linux/misc_cgroup.h b/include/linux/misc_cgroup.h
> index 0806d4436208..541a5611c597 100644
> --- a/include/linux/misc_cgroup.h
> +++ b/include/linux/misc_cgroup.h
> @@ -64,6 +64,7 @@ struct misc_cg {
>  	struct misc_res res[MISC_CG_RES_TYPES];
>  };
>  
> +struct misc_cg *misc_cg_root(void);
>  u64 misc_cg_res_total_usage(enum misc_res_type type);
>  int misc_cg_set_capacity(enum misc_res_type type, u64 capacity);
>  int misc_cg_set_ops(enum misc_res_type type, const struct misc_res_ops *ops);
> @@ -84,6 +85,20 @@ static inline struct misc_cg *css_misc(struct cgroup_subsys_state *css)
>  	return css ? container_of(css, struct misc_cg, css) : NULL;
>  }
>  
> +/**
> + * misc_cg_parent() - Get the parent of the passed misc cgroup.
> + * @cgroup: cgroup whose parent needs to be fetched.
> + *
> + * Context: Any context.
> + * Return:
> + * * struct misc_cg* - Parent of the @cgroup.
> + * * %NULL - If @cgroup is null or the passed cgroup does not have a parent.
> + */
> +static inline struct misc_cg *misc_cg_parent(struct misc_cg *cgroup)
> +{
> +	return cgroup ? css_misc(cgroup->css.parent) : NULL;
> +}
> +
>  /*
>   * get_current_misc_cg() - Find and get the misc cgroup of the current task.
>   *
> @@ -108,6 +123,15 @@ static inline void put_misc_cg(struct misc_cg *cg)
>  }
>  
>  #else /* !CONFIG_CGROUP_MISC */
> +static inline struct misc_cg *misc_cg_root(void)
> +{
> +	return NULL;
> +}
> +
> +static inline struct misc_cg *misc_cg_parent(struct misc_cg *cg)
> +{
> +	return NULL;
> +}
>  
>  static inline u64 misc_cg_res_total_usage(enum misc_res_type type)
>  {
> diff --git a/kernel/cgroup/misc.c b/kernel/cgroup/misc.c
> index b8c32791334c..99d971ecc842 100644
> --- a/kernel/cgroup/misc.c
> +++ b/kernel/cgroup/misc.c
> @@ -43,18 +43,13 @@ static u64 misc_res_capacity[MISC_CG_RES_TYPES];
>  static const struct misc_res_ops *misc_res_ops[MISC_CG_RES_TYPES];
>  
>  /**
> - * parent_misc() - Get the parent of the passed misc cgroup.
> - * @cgroup: cgroup whose parent needs to be fetched.
> - *
> - * Context: Any context.
> - * Return:
> - * * struct misc_cg* - Parent of the @cgroup.
> - * * %NULL - If @cgroup is null or the passed cgroup does not have a parent.
> + * misc_cg_root() - Return the root misc cgroup.
>   */
> -static struct misc_cg *parent_misc(struct misc_cg *cgroup)
> +struct misc_cg *misc_cg_root(void)
>  {
> -	return cgroup ? css_misc(cgroup->css.parent) : NULL;
> +	return &root_cg;
>  }
> +EXPORT_SYMBOL_GPL(misc_cg_root);
>  
>  /**
>   * valid_type() - Check if @type is valid or not.
> @@ -183,7 +178,7 @@ int misc_cg_try_charge(enum misc_res_type type, struct misc_cg *cg, u64 amount)
>  	if (!amount)
>  		return 0;
>  
> -	for (i = cg; i; i = parent_misc(i)) {
> +	for (i = cg; i; i = misc_cg_parent(i)) {
>  		res = &i->res[type];
>  
>  		new_usage = atomic64_add_return(amount, &res->usage);
> @@ -196,12 +191,12 @@ int misc_cg_try_charge(enum misc_res_type type, struct misc_cg *cg, u64 amount)
>  	return 0;
>  
>  err_charge:
> -	for (j = i; j; j = parent_misc(j)) {
> +	for (j = i; j; j = misc_cg_parent(j)) {
>  		atomic64_inc(&j->res[type].events);
>  		cgroup_file_notify(&j->events_file);
>  	}
>  
> -	for (j = cg; j != i; j = parent_misc(j))
> +	for (j = cg; j != i; j = misc_cg_parent(j))
>  		misc_cg_cancel_charge(type, j, amount);
>  	misc_cg_cancel_charge(type, i, amount);
>  	return ret;
> @@ -223,7 +218,7 @@ void misc_cg_uncharge(enum misc_res_type type, struct misc_cg *cg, u64 amount)
>  	if (!(amount && valid_type(type) && cg))
>  		return;
>  
> -	for (i = cg; i; i = parent_misc(i))
> +	for (i = cg; i; i = misc_cg_parent(i))
>  		misc_cg_cancel_charge(type, i, amount);
>  }
>  EXPORT_SYMBOL_GPL(misc_cg_uncharge);

Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>

BR, Jarkko
diff mbox series

Patch

diff --git a/include/linux/misc_cgroup.h b/include/linux/misc_cgroup.h
index 0806d4436208..541a5611c597 100644
--- a/include/linux/misc_cgroup.h
+++ b/include/linux/misc_cgroup.h
@@ -64,6 +64,7 @@  struct misc_cg {
 	struct misc_res res[MISC_CG_RES_TYPES];
 };
 
+struct misc_cg *misc_cg_root(void);
 u64 misc_cg_res_total_usage(enum misc_res_type type);
 int misc_cg_set_capacity(enum misc_res_type type, u64 capacity);
 int misc_cg_set_ops(enum misc_res_type type, const struct misc_res_ops *ops);
@@ -84,6 +85,20 @@  static inline struct misc_cg *css_misc(struct cgroup_subsys_state *css)
 	return css ? container_of(css, struct misc_cg, css) : NULL;
 }
 
+/**
+ * misc_cg_parent() - Get the parent of the passed misc cgroup.
+ * @cgroup: cgroup whose parent needs to be fetched.
+ *
+ * Context: Any context.
+ * Return:
+ * * struct misc_cg* - Parent of the @cgroup.
+ * * %NULL - If @cgroup is null or the passed cgroup does not have a parent.
+ */
+static inline struct misc_cg *misc_cg_parent(struct misc_cg *cgroup)
+{
+	return cgroup ? css_misc(cgroup->css.parent) : NULL;
+}
+
 /*
  * get_current_misc_cg() - Find and get the misc cgroup of the current task.
  *
@@ -108,6 +123,15 @@  static inline void put_misc_cg(struct misc_cg *cg)
 }
 
 #else /* !CONFIG_CGROUP_MISC */
+static inline struct misc_cg *misc_cg_root(void)
+{
+	return NULL;
+}
+
+static inline struct misc_cg *misc_cg_parent(struct misc_cg *cg)
+{
+	return NULL;
+}
 
 static inline u64 misc_cg_res_total_usage(enum misc_res_type type)
 {
diff --git a/kernel/cgroup/misc.c b/kernel/cgroup/misc.c
index b8c32791334c..99d971ecc842 100644
--- a/kernel/cgroup/misc.c
+++ b/kernel/cgroup/misc.c
@@ -43,18 +43,13 @@  static u64 misc_res_capacity[MISC_CG_RES_TYPES];
 static const struct misc_res_ops *misc_res_ops[MISC_CG_RES_TYPES];
 
 /**
- * parent_misc() - Get the parent of the passed misc cgroup.
- * @cgroup: cgroup whose parent needs to be fetched.
- *
- * Context: Any context.
- * Return:
- * * struct misc_cg* - Parent of the @cgroup.
- * * %NULL - If @cgroup is null or the passed cgroup does not have a parent.
+ * misc_cg_root() - Return the root misc cgroup.
  */
-static struct misc_cg *parent_misc(struct misc_cg *cgroup)
+struct misc_cg *misc_cg_root(void)
 {
-	return cgroup ? css_misc(cgroup->css.parent) : NULL;
+	return &root_cg;
 }
+EXPORT_SYMBOL_GPL(misc_cg_root);
 
 /**
  * valid_type() - Check if @type is valid or not.
@@ -183,7 +178,7 @@  int misc_cg_try_charge(enum misc_res_type type, struct misc_cg *cg, u64 amount)
 	if (!amount)
 		return 0;
 
-	for (i = cg; i; i = parent_misc(i)) {
+	for (i = cg; i; i = misc_cg_parent(i)) {
 		res = &i->res[type];
 
 		new_usage = atomic64_add_return(amount, &res->usage);
@@ -196,12 +191,12 @@  int misc_cg_try_charge(enum misc_res_type type, struct misc_cg *cg, u64 amount)
 	return 0;
 
 err_charge:
-	for (j = i; j; j = parent_misc(j)) {
+	for (j = i; j; j = misc_cg_parent(j)) {
 		atomic64_inc(&j->res[type].events);
 		cgroup_file_notify(&j->events_file);
 	}
 
-	for (j = cg; j != i; j = parent_misc(j))
+	for (j = cg; j != i; j = misc_cg_parent(j))
 		misc_cg_cancel_charge(type, j, amount);
 	misc_cg_cancel_charge(type, i, amount);
 	return ret;
@@ -223,7 +218,7 @@  void misc_cg_uncharge(enum misc_res_type type, struct misc_cg *cg, u64 amount)
 	if (!(amount && valid_type(type) && cg))
 		return;
 
-	for (i = cg; i; i = parent_misc(i))
+	for (i = cg; i; i = misc_cg_parent(i))
 		misc_cg_cancel_charge(type, i, amount);
 }
 EXPORT_SYMBOL_GPL(misc_cg_uncharge);