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x86/intel_rdt: Associate mode with each RDT resource group

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Each RDT resource group is associated with a mode that will reflect
the level of sharing of its allocations. The default, shareable, will be
associated with each resource group on creation since it is zero and
resource groups are created with kzalloc. The managing of the mode of a
resource group will follow. The default resource group always remain
though so ensure that it is reset to the default mode when the resctrl
filesystem is unmounted.

Also introduce a utility that can be used to determine the mode of a
resource group when it is searched for based on its class of service.

Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: fenghua.yu@intel.com
Cc: tony.luck@intel.com
Cc: vikas.shivappa@linux.intel.com
Cc: gavin.hindman@intel.com
Cc: jithu.joseph@intel.com
Cc: dave.hansen@intel.com
Cc: hpa@zytor.com
Link: https://lkml.kernel.org/r/797e4e1de4e4fcdf5b5e0039354d6a28079e2015.1529706536.git.reinette.chatre@intel.com
This commit is contained in:
Reinette Chatre
2018-06-22 15:41:55 -07:00
committed by Thomas Gleixner
parent eb956a636f
commit 472ef09b40
2 changed files with 25 additions and 0 deletions
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3
arch/x86/kernel/cpu/intel_rdt.h
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@@ -122,6 +122,7 @@ struct mongroup {
* @type: indicates type of this rdtgroup - either
* monitor only or ctrl_mon group
* @mon: mongroup related data
* @mode: mode of resource group
*/
struct rdtgroup {
struct kernfs_node *kn;
@@ -132,6 +133,7 @@ struct rdtgroup {
atomic_t waitcount;
enum rdt_group_type type;
struct mongroup mon;
enum rdtgrp_mode mode;
};
/* rdtgroup.flags */
@@ -461,6 +463,7 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off);
int rdtgroup_schemata_show(struct kernfs_open_file *of,
struct seq_file *s, void *v);
enum rdtgrp_mode rdtgroup_mode_by_closid(int closid);
struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r);
int alloc_rmid(void);
void free_rmid(u32 rmid);