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Commit bb9fec69 authored by Reinette Chatre's avatar Reinette Chatre Committed by Thomas Gleixner
Browse files

x86/intel_rdt: Introduce the Cache Pseudo-Locking modes 



The two modes used to manage Cache Pseudo-Locked regions are introduced.  A
resource group is assigned "pseudo-locksetup" mode when the user indicates
that this resource group will be used for a Cache Pseudo-Locked
region. When the Cache Pseudo-Locked region has been set up successfully
after the user wrote the requested schemata to the "schemata" file, then
the mode will automatically changed to "pseudo-locked".  The user is not
able to modify the mode to "pseudo-locked" by writing "pseudo-locked" to
the "mode" file directly.

Signed-off-by: default avatarReinette Chatre <reinette.chatre@intel.com>
Signed-off-by: default avatarThomas 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/98d6ca129bbe7dd0932d1fcfeb3cbb65f29a8d9d.1529706536.git.reinette.chatre@intel.com
parent e17e7330

arch/x86/kernel/cpu/intel_rdt.h

+10 −0
Original line number Diff line number Diff line
@@ -84,15 +84,25 @@ 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

 * @RDT_MODE_PSEUDO_LOCKSETUP: Resource group will be used for Pseudo-Locking

 * @RDT_MODE_PSEUDO_LOCKED: No sharing of this resource group's allocations

 *                          allowed AND the allocations are Cache Pseudo-Locked

 *

 * The mode of a resource group enables control over the allowed overlap

 * between allocations associated with different resource groups (classes

 * of service). User is able to modify the mode of a resource group by

 * writing to the "mode" resctrl file associated with the resource group.

 *

 * The "shareable", "exclusive", and "pseudo-locksetup" modes are set by

 * writing the appropriate text to the "mode" file. A resource group enters

 * "pseudo-locked" mode after the schemata is written while the resource

 * group is in "pseudo-locksetup" mode.

 */

enum rdtgrp_mode {

	RDT_MODE_SHAREABLE = 0,

	RDT_MODE_EXCLUSIVE,

	RDT_MODE_PSEUDO_LOCKSETUP,

	RDT_MODE_PSEUDO_LOCKED,



	/* Must be last */

	RDT_NUM_MODES,

arch/x86/kernel/cpu/intel_rdt_rdtgroup.c

+11 −2
Original line number Diff line number Diff line
@@ -163,6 +163,8 @@ enum rdtgrp_mode rdtgroup_mode_by_closid(int closid) 
static const char * const rdt_mode_str[] = {

	[RDT_MODE_SHAREABLE]		= "shareable",

	[RDT_MODE_EXCLUSIVE]		= "exclusive",

	[RDT_MODE_PSEUDO_LOCKSETUP]	= "pseudo-locksetup",

	[RDT_MODE_PSEUDO_LOCKED]	= "pseudo-locked",

};



/**
@@ -759,6 +761,13 @@ static int rdt_bit_usage_show(struct kernfs_open_file *of, 
			case RDT_MODE_EXCLUSIVE:

				exclusive |= *ctrl;

				break;

			/*

			 * Temporarily handle pseudo-locking enums

			 * to silence compile warnings until handling

			 * added in later patches.

			 */

			case RDT_MODE_PSEUDO_LOCKSETUP:

			case RDT_MODE_PSEUDO_LOCKED:

			case RDT_NUM_MODES:

				WARN(1,

				     "invalid mode for closid %d\n", i);