linux-kernel - [RFC PATCH 14/20] x86/intel_rdt: Enable testing for pseudo-locked region

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Message-Id: <7996f6de3340cbc041a896df2cdfb4352cd344db.1510568528.git.reinette.chatre@intel.com>
Date:   Mon, 13 Nov 2017 08:39:37 -0800
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     tglx@...utronix.de, fenghua.yu@...el.com, tony.luck@...el.com
Cc:     vikas.shivappa@...ux.intel.com, dave.hansen@...el.com,
        mingo@...hat.com, hpa@...or.com, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        Reinette Chatre <reinette.chatre@...el.com>
Subject: [RFC PATCH 14/20] x86/intel_rdt: Enable testing for pseudo-locked region

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@...el.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 b4426a997516..529fe535b357 100644
--- a/arch/x86/kernel/cpu/intel_rdt.h
+++ b/arch/x86/kernel/cpu/intel_rdt.h
@@ -457,6 +457,7 @@ 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 c859ff7dea6e..9c0f002c08ea 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
-- 
2.13.5