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.cha...@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