From: Reinette Chatre <reinette.chatre@intel.com>
To: tglx@linutronix.de, fenghua.yu@intel.com, tony.luck@intel.com,
vikas.shivappa@linux.intel.com
Cc: gavin.hindman@intel.com, jithu.joseph@intel.com,
dave.hansen@intel.com, mingo@redhat.com, hpa@zytor.com,
x86@kernel.org, linux-kernel@vger.kernel.org,
Reinette Chatre <reinette.chatre@intel.com>
Subject: [PATCH V4 16/38] x86/intel_rdt: Introduce the Cache Pseudo-Locking modes
Date: Tue, 22 May 2018 04:29:04 -0700 [thread overview]
Message-ID: <35492bea9659fe5db706769c4644596a1b6c7d6d.1526987654.git.reinette.chatre@intel.com> (raw)
In-Reply-To: <cover.1526987654.git.reinette.chatre@intel.com>
In-Reply-To: <cover.1526987654.git.reinette.chatre@intel.com>
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>
---
arch/x86/kernel/cpu/intel_rdt.h | 10 ++++++++++
arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 13 +++++++++++--
2 files changed, 21 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/cpu/intel_rdt.h b/arch/x86/kernel/cpu/intel_rdt.h
index 8bbb047bf37c..bda87f5ef7bc 100644
--- a/arch/x86/kernel/cpu/intel_rdt.h
+++ b/arch/x86/kernel/cpu/intel_rdt.h
@@ -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,
diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
index 2af99e03faae..e6069822f592 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -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);
--
2.13.6
next prev parent reply other threads:[~2018-05-22 19:40 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-22 11:28 [PATCH V4 00/38] Intel(R) Resource Director Technology Cache Pseudo-Locking enabling Reinette Chatre
2018-05-22 11:28 ` [PATCH V4 01/38] x86/intel_rdt: Document new mode, size, and bit_usage Reinette Chatre
2018-05-22 11:28 ` [PATCH V4 02/38] x86/intel_rdt: Introduce RDT resource group mode Reinette Chatre
2018-05-22 11:28 ` [PATCH V4 03/38] x86/intel_rdt: Associate mode with each RDT resource group Reinette Chatre
2018-05-22 11:28 ` [PATCH V4 04/38] x86/intel_rdt: Introduce resource group's mode resctrl file Reinette Chatre
2018-05-22 11:28 ` [PATCH V4 05/38] x86/intel_rdt: Introduce test to determine if closid is in use Reinette Chatre
2018-05-22 11:28 ` [PATCH V4 06/38] x86/intel_rdt: Make useful functions available internally Reinette Chatre
2018-05-22 11:28 ` [PATCH V4 07/38] x86/intel_rdt: Initialize new resource group with sane defaults Reinette Chatre
2018-05-22 11:28 ` [PATCH V4 08/38] x86/intel_rdt: Introduce new "exclusive" mode Reinette Chatre
2018-05-22 11:28 ` [PATCH V4 09/38] x86/intel_rdt: Enable setting of exclusive mode Reinette Chatre
2018-05-22 11:28 ` [PATCH V4 10/38] x86/intel_rdt: Making CBM name and type more explicit Reinette Chatre
2018-05-22 11:28 ` [PATCH V4 11/38] x86/intel_rdt: Support flexible data to parsing callbacks Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 12/38] x86/intel_rdt: Ensure requested schemata respects mode Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 13/38] x86/intel_rdt: Introduce "bit_usage" to display cache allocations details Reinette Chatre
2018-05-22 21:03 ` Randy Dunlap
2018-05-22 21:09 ` Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 14/38] x86/intel_rdt: Display resource groups' allocations' size in bytes Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 15/38] x86/intel_rdt: Documentation for Cache Pseudo-Locking Reinette Chatre
2018-05-22 11:29 ` Reinette Chatre [this message]
2018-05-22 11:29 ` [PATCH V4 17/38] x86/intel_rdt: Respect read and write access Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 18/38] x86/intel_rdt: Add utility to test if tasks assigned to resource group Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 19/38] x86/intel_rdt: Add utility to restrict/restore access to resctrl files Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 20/38] x86/intel_rdt: Protect against resource group changes during locking Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 21/38] x86/intel_rdt: Utilities to restrict/restore access to specific files Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 22/38] x86/intel_rdt: Add check to determine if monitoring in progress Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 23/38] x86/intel_rdt: Introduce pseudo-locked region Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 24/38] x86/intel_rdt: Support enter/exit of locksetup mode Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 25/38] x86/intel_rdt: Enable entering of pseudo-locksetup mode Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 26/38] x86/intel_rdt: Split resource group removal in two Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 27/38] x86/intel_rdt: Add utilities to test pseudo-locked region possibility Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 28/38] x86/intel_rdt: Discover supported platforms via prefetch disable bits Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 29/38] x86/intel_rdt: Pseudo-lock region creation/removal core Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 30/38] x86/intel_rdt: Support creation/removal of pseudo-locked region Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 31/38] x86/intel_rdt: resctrl files reflect pseudo-locked information Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 32/38] x86/intel_rdt: Ensure RDT cleanup on exit Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 33/38] x86/intel_rdt: Create resctrl debug area Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 34/38] x86/intel_rdt: Create debugfs files for pseudo-locking testing Reinette Chatre
2018-05-22 19:43 ` Greg KH
2018-05-22 21:02 ` Reinette Chatre
2018-05-23 8:05 ` Greg KH
2018-05-23 17:19 ` Reinette Chatre
2018-05-23 17:27 ` Greg KH
2018-05-22 11:29 ` [PATCH V4 35/38] x86/intel_rdt: Create character device exposing pseudo-locked region Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 36/38] x86/intel_rdt: More precise L2 hit/miss measurements Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 37/38] x86/intel_rdt: Support L3 cache performance event of Broadwell Reinette Chatre
2018-05-22 11:29 ` [PATCH V4 38/38] x86/intel_rdt: Limit C-states dynamically when pseudo-locking active Reinette Chatre
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