x86/intel_rdt: Introduce pseudo-locked region

A pseudo-locked region is introduced representing an instance of a
pseudo-locked cache region. Each cache instance (domain) can support one
pseudo-locked region. Similarly a resource group can be used for one
pseudo-locked region.

Include a pointer to a pseudo-locked region from the domain and resource
group structures.
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/9f69eb159051067703bcbc714de62e69874d5dee.1529706536.git.reinette.chatre@intel.com

arch/x86/kernel/cpu/intel_rdt.h

@@ -122,6 +122,20 @@ struct mongroup {
 	u32			rmid;
 };
 
+/**
+ * struct pseudo_lock_region - pseudo-lock region information
+ * @r:			RDT resource to which this pseudo-locked region
+ *			belongs
+ * @d:			RDT domain to which this pseudo-locked region
+ *			belongs
+ * @cbm:		bitmask of the pseudo-locked region
+ */
+struct pseudo_lock_region {
+	struct rdt_resource	*r;
+	struct rdt_domain	*d;
+	u32			cbm;
+};
+
 /**
  * struct rdtgroup - store rdtgroup's data in resctrl file system.
  * @kn:				kernfs node
@@ -135,6 +149,7 @@ struct mongroup {
  *				monitor only or ctrl_mon group
  * @mon:			mongroup related data
  * @mode:			mode of resource group
+ * @plr:			pseudo-locked region
  */
 struct rdtgroup {
 	struct kernfs_node		*kn;
@@ -146,6 +161,7 @@ struct rdtgroup {
 	enum rdt_group_type		type;
 	struct mongroup			mon;
 	enum rdtgrp_mode		mode;
+	struct pseudo_lock_region	*plr;
 };
 
 /* rdtgroup.flags */
@@ -246,6 +262,7 @@ struct mbm_state {
  * @mbps_val:	When mba_sc is enabled, this holds the bandwidth in MBps
  * @new_ctrl:	new ctrl value to be loaded
  * @have_new_ctrl: did user provide new_ctrl for this domain
+ * @plr:	pseudo-locked region (if any) associated with domain
  */
 struct rdt_domain {
 	struct list_head		list;
@@ -262,6 +279,7 @@ struct rdt_domain {
 	u32				*mbps_val;
 	u32				new_ctrl;
 	bool				have_new_ctrl;
+	struct pseudo_lock_region	*plr;
 };
 
 /**