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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: 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/98d6ca129bbe7dd0932d1fcfeb3cbb65f29a8d9d.1529706536.git.reinette.chatre@intel.com
This commit is contained in:
Reinette Chatre 2018-06-22 15:42:08 -07:00 committed by Thomas Gleixner
parent e17e733070
commit bb9fec69cb
2 changed files with 21 additions and 2 deletions
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10
arch/x86/kernel/cpu/intel_rdt.h
View File

@ -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,

13
arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
View File

@ -161,8 +161,10 @@ 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_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);