x86/intel_rdt: Introduce new "exclusive" mode

rchatre · KAGA-KOKO · commit 414dd2b47329 · 2018-06-23T13:03:42.000+02:00
At the moment all allocations are shareable. There is no way for a user to designate that an allocation associated with a resource group cannot be shared by another. Introduce the new mode "exclusive". When a resource group is marked as such it implies that no overlap is allowed between its allocation and that of another resource group. 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/f6d24672a4280fe3b24cd2da9b5f50214439c1af.1529706536.git.reinette.chatre@intel.com
diff --git a/arch/x86/kernel/cpu/intel_rdt.h b/arch/x86/kernel/cpu/intel_rdt.h
@@ -83,6 +83,7 @@ enum rdt_group_type {
 /**
  * enum rdtgrp_mode - Mode of a RDT resource group
  * @RDT_MODE_SHAREABLE: This resource group allows sharing of its allocations
+ * @RDT_MODE_EXCLUSIVE: No sharing of this resource group's allocations allowed
  *
  * The mode of a resource group enables control over the allowed overlap
  * between allocations associated with different resource groups (classes
@@ -91,6 +92,7 @@ enum rdt_group_type {
  */
 enum rdtgrp_mode {
 	RDT_MODE_SHAREABLE = 0,
+	RDT_MODE_EXCLUSIVE,
 
 	/* Must be last */
 	RDT_NUM_MODES,
diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -161,6 +161,7 @@ enum rdtgrp_mode rdtgroup_mode_by_closid(int closid)
 
 static const char * const rdt_mode_str[] = {
 	[RDT_MODE_SHAREABLE]	= "shareable",
+	[RDT_MODE_EXCLUSIVE]	= "exclusive",
 };
 
 /**
