From: Reinette Chatre <reinette.chatre@intel.com>
To: tglx@linutronix.de, fenghua.yu@intel.com, tony.luck@intel.com
Cc: gavin.hindman@intel.com, vikas.shivappa@linux.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: [RFC PATCH V2 14/22] x86/intel_rdt: Enable testing for pseudo-locked region
Date: Tue, 13 Feb 2018 07:46:58 -0800 [thread overview]
Message-ID: <4e496c20779a21154eea9b37270eed9d340b9514.1518443616.git.reinette.chatre@intel.com> (raw)
In-Reply-To: <cover.1518443616.git.reinette.chatre@intel.com>
In-Reply-To: <cover.1518443616.git.reinette.chatre@intel.com>
Introduce a new test that can be used to determine if a provided CBM
intersects with an existing pseudo-locked region of cache domain.
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
---
arch/x86/kernel/cpu/intel_rdt.h | 1 +
arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c | 19 +++++++++++++++++++
2 files changed, 20 insertions(+)
diff --git a/arch/x86/kernel/cpu/intel_rdt.h b/arch/x86/kernel/cpu/intel_rdt.h
index 85f9ad6de113..17b7d14e2e02 100644
--- a/arch/x86/kernel/cpu/intel_rdt.h
+++ b/arch/x86/kernel/cpu/intel_rdt.h
@@ -462,6 +462,7 @@ void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms);
void cqm_handle_limbo(struct work_struct *work);
bool has_busy_rmid(struct rdt_resource *r, struct rdt_domain *d);
void __check_limbo(struct rdt_domain *d, bool force_free);
+bool cbm_pseudo_locked(unsigned long cbm, struct rdt_domain *d);
int rdt_pseudo_lock_fs_init(struct kernfs_node *root);
void rdt_pseudo_lock_fs_remove(void);
int rdt_pseudo_lock_mkdir(const char *name, umode_t mode);
diff --git a/arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c b/arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c
index 1f351b7170ef..e9ab724432f8 100644
--- a/arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c
+++ b/arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c
@@ -273,6 +273,25 @@ static void pseudo_lock_region_kn_unlock(struct kernfs_node *kn)
}
/**
+ * cbm_pseudo_locked - Test if all or portion of CBM is pseudo-locked
+ * @cbm: bitmask to be tested
+ * @d: rdt_domain for which @cbm was provided
+ *
+ * RETURNS:
+ * True if bits from @cbm intersects with what has been pseudo-locked in
+ * rdt_domain @d, false otherwise.
+ */
+bool cbm_pseudo_locked(unsigned long cbm, struct rdt_domain *d)
+{
+ if (d->plr &&
+ bitmap_intersects(&cbm, (unsigned long *)&d->plr->cbm,
+ d->plr->r->cache.cbm_len))
+ return true;
+
+ return false;
+}
+
+/**
* pseudo_lock_avail_get - return bitmask of cache available for locking
* @r: resource to which this cache instance belongs
* @d: domain representing the cache instance
--
2.13.6
next prev parent reply other threads:[~2018-02-13 23:51 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-13 15:46 [RFC PATCH V2 00/22] Intel(R) Resource Director Technology Cache Pseudo-Locking enabling Reinette Chatre
2018-02-13 15:46 ` [RFC PATCH V2 01/22] x86/intel_rdt: Documentation for Cache Pseudo-Locking Reinette Chatre
2018-02-19 20:35 ` Thomas Gleixner
2018-02-19 22:15 ` Reinette Chatre
2018-02-19 22:19 ` Thomas Gleixner
2018-02-19 22:24 ` Reinette Chatre
2018-02-19 21:27 ` Randy Dunlap
2018-02-19 22:21 ` Reinette Chatre
2018-02-13 15:46 ` [RFC PATCH V2 02/22] x86/intel_rdt: Make useful functions available internally Reinette Chatre
2018-02-13 15:46 ` [RFC PATCH V2 03/22] x86/intel_rdt: Introduce hooks to create pseudo-locking files Reinette Chatre
2018-02-13 15:46 ` [RFC PATCH V2 04/22] x86/intel_rdt: Introduce test to determine if closid is in use Reinette Chatre
2018-02-13 15:46 ` [RFC PATCH V2 05/22] x86/intel_rdt: Print more accurate pseudo-locking availability Reinette Chatre
2018-02-13 15:46 ` [RFC PATCH V2 06/22] x86/intel_rdt: Create pseudo-locked regions Reinette Chatre
2018-02-19 20:57 ` Thomas Gleixner
2018-02-19 23:02 ` Reinette Chatre
2018-02-19 23:16 ` Thomas Gleixner
2018-02-20 3:21 ` Reinette Chatre
2018-02-13 15:46 ` [RFC PATCH V2 07/22] x86/intel_rdt: Connect pseudo-locking directory to operations Reinette Chatre
2018-02-13 15:46 ` [RFC PATCH V2 08/22] x86/intel_rdt: Introduce pseudo-locking resctrl files Reinette Chatre
2018-02-19 21:01 ` Thomas Gleixner
2018-02-13 15:46 ` [RFC PATCH V2 09/22] x86/intel_rdt: Discover supported platforms via prefetch disable bits Reinette Chatre
2018-02-13 15:46 ` [RFC PATCH V2 10/22] x86/intel_rdt: Disable pseudo-locking if CDP enabled Reinette Chatre
2018-02-13 15:46 ` [RFC PATCH V2 11/22] x86/intel_rdt: Associate pseudo-locked regions with its domain Reinette Chatre
2018-02-19 21:19 ` Thomas Gleixner
2018-02-19 23:00 ` Reinette Chatre
2018-02-19 23:19 ` Thomas Gleixner
2018-02-20 3:17 ` Reinette Chatre
2018-02-20 10:00 ` Thomas Gleixner
2018-02-20 16:02 ` Reinette Chatre
2018-02-20 17:18 ` Thomas Gleixner
2018-02-13 15:46 ` [RFC PATCH V2 12/22] x86/intel_rdt: Support CBM checking from value and character buffer Reinette Chatre
2018-02-13 15:46 ` [RFC PATCH V2 13/22] x86/intel_rdt: Support schemata write - pseudo-locking core Reinette Chatre
2018-02-20 17:15 ` Thomas Gleixner
2018-02-20 18:47 ` Reinette Chatre
2018-02-20 23:21 ` Thomas Gleixner
2018-02-21 1:58 ` Mike Kravetz
2018-02-21 6:10 ` Reinette Chatre
2018-02-21 8:34 ` Thomas Gleixner
2018-02-21 5:58 ` Reinette Chatre
2018-02-27 0:34 ` Reinette Chatre
2018-02-27 10:36 ` Thomas Gleixner
2018-02-27 15:38 ` Thomas Gleixner
2018-02-27 19:52 ` Reinette Chatre
2018-02-27 21:33 ` Reinette Chatre
2018-02-28 18:39 ` Thomas Gleixner
2018-02-28 19:17 ` Reinette Chatre
2018-02-28 19:40 ` Thomas Gleixner
2018-02-27 21:01 ` Reinette Chatre
2018-02-28 17:57 ` Thomas Gleixner
2018-02-28 17:59 ` Thomas Gleixner
2018-02-28 18:34 ` Reinette Chatre
2018-02-28 18:42 ` Thomas Gleixner
2018-02-13 15:46 ` Reinette Chatre [this message]
2018-02-13 15:46 ` [RFC PATCH V2 15/22] x86/intel_rdt: Prevent new allocations from pseudo-locked regions Reinette Chatre
2018-02-13 15:47 ` [RFC PATCH V2 16/22] x86/intel_rdt: Create debugfs files for pseudo-locking testing Reinette Chatre
2018-02-13 15:47 ` [RFC PATCH V2 17/22] x86/intel_rdt: Create character device exposing pseudo-locked region Reinette Chatre
2018-02-13 15:47 ` [RFC PATCH V2 18/22] x86/intel_rdt: More precise L2 hit/miss measurements Reinette Chatre
2018-02-13 15:47 ` [RFC PATCH V2 19/22] x86/intel_rdt: Support L3 cache performance event of Broadwell Reinette Chatre
2018-02-13 15:47 ` [RFC PATCH V2 20/22] x86/intel_rdt: Limit C-states dynamically when pseudo-locking active Reinette Chatre
2018-02-13 15:47 ` [RFC PATCH V2 21/22] mm/hugetlb: Enable large allocations through gigantic page API Reinette Chatre
2018-02-13 15:47 ` [RFC PATCH V2 22/22] x86/intel_rdt: Support contiguous memory of all sizes Reinette Chatre
2018-02-14 18:12 ` [RFC PATCH V2 00/22] Intel(R) Resource Director Technology Cache Pseudo-Locking enabling Mike Kravetz
2018-02-14 18:31 ` Reinette Chatre
2018-02-15 20:39 ` Reinette Chatre
2018-02-15 21:10 ` Mike Kravetz
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