Commit-ID: f438e62bcabd3e616b6280d422c5ba1c70b37f44 Gitweb: https://git.kernel.org/tip/f438e62bcabd3e616b6280d422c5ba1c70b37f44 Author: Reinette Chatre <reinette.cha...@intel.com> AuthorDate: Tue, 29 May 2018 05:57:41 -0700 Committer: Thomas Gleixner <t...@linutronix.de> CommitDate: Wed, 20 Jun 2018 00:56:33 +0200
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.cha...@intel.com> Signed-off-by: Thomas Gleixner <t...@linutronix.de> Cc: fenghua...@intel.com Cc: tony.l...@intel.com Cc: vikas.shiva...@linux.intel.com Cc: gavin.hind...@intel.com Cc: jithu.jos...@intel.com Cc: dave.han...@intel.com Cc: h...@zytor.com Link: https://lkml.kernel.org/r/6ab82fb595f4b0ffa305dc204255b921eed51de7.1527593970.git.reinette.cha...@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 7d63380abe02..9e69f4dbc686 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);
