linux-kernel - [tip:x86/cache] x86/intel_rdt: Introduce new "exclusive" mode

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Date:   Sat, 23 Jun 2018 05:11:25 -0700
From:   tip-bot for Reinette Chatre <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, linux-kernel@...r.kernel.org, hpa@...or.com,
        tglx@...utronix.de, reinette.chatre@...el.com
Subject: [tip:x86/cache] x86/intel_rdt: Introduce new "exclusive" mode

Commit-ID:  414dd2b4732949ddc972c2592a13c799434249c6
Gitweb:     https://git.kernel.org/tip/414dd2b4732949ddc972c2592a13c799434249c6
Author:     Reinette Chatre <reinette.chatre@...el.com>
AuthorDate: Fri, 22 Jun 2018 15:42:00 -0700
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Sat, 23 Jun 2018 13:03:42 +0200

x86/intel_rdt: Introduce new "exclusive" mode

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@...el.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: fenghua.yu@...el.com
Cc: tony.luck@...el.com
Cc: vikas.shivappa@...ux.intel.com
Cc: gavin.hindman@...el.com
Cc: jithu.joseph@...el.com
Cc: dave.hansen@...el.com
Cc: hpa@...or.com
Link: https://lkml.kernel.org/r/f6d24672a4280fe3b24cd2da9b5f50214439c1af.1529706536.git.reinette.chatre@intel.com

---
 arch/x86/kernel/cpu/intel_rdt.h          | 2 ++
 arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 1 +
 2 files changed, 3 insertions(+)

diff --git a/arch/x86/kernel/cpu/intel_rdt.h b/arch/x86/kernel/cpu/intel_rdt.h
index f2fbf4059b3f..c9033fd774d5 100644
--- 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
index 80ac09cf978b..910febef55e8 100644
--- 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",
 };
 
 /**