Commit-ID: c793da8e4c62d2c002a79c47f44efead450cbcae Gitweb: https://git.kernel.org/tip/c793da8e4c62d2c002a79c47f44efead450cbcae Author: Reinette Chatre <reinette.cha...@intel.com> AuthorDate: Sat, 15 Sep 2018 14:58:21 -0700 Committer: Thomas Gleixner <t...@linutronix.de> CommitDate: Tue, 18 Sep 2018 23:38:05 +0200
x86/intel_rdt: Global closid helper to support future fixes The number of CLOSIDs supported by a system is the minimum number of CLOSIDs supported by any of its resources. Care should be taken when iterating over the CLOSIDs of a resource since it may be that the number of CLOSIDs supported on the system is less than the number of CLOSIDs supported by the resource. Introduce a helper function that can be used to query the number of CLOSIDs that is supported by all resources, irrespective of how many CLOSIDs are supported by a particular resource. Signed-off-by: Reinette Chatre <reinette.cha...@intel.com> Signed-off-by: Fenghua Yu <fenghua...@intel.com> Signed-off-by: Thomas Gleixner <t...@linutronix.de> Cc: "H Peter Anvin" <h...@zytor.com> Cc: "Tony Luck" <tony.l...@intel.com> Cc: "Xiaochen Shen" <xiaochen.s...@intel.com> Cc: "Chen Yu" <yu.c.c...@intel.com> Link: https://lkml.kernel.org/r/1537048707-76280-4-git-send-email-fenghua...@intel.com --- arch/x86/kernel/cpu/intel_rdt.h | 1 + arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 7 +++++++ 2 files changed, 8 insertions(+) diff --git a/arch/x86/kernel/cpu/intel_rdt.h b/arch/x86/kernel/cpu/intel_rdt.h index 78266c798280..285eb3ec4200 100644 --- a/arch/x86/kernel/cpu/intel_rdt.h +++ b/arch/x86/kernel/cpu/intel_rdt.h @@ -544,6 +544,7 @@ int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp); void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp); struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r); int update_domains(struct rdt_resource *r, int closid); +int closids_supported(void); void closid_free(int closid); int alloc_rmid(void); void free_rmid(u32 rmid); diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c index 32e8bbdf2400..b372923eb209 100644 --- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c +++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c @@ -97,6 +97,12 @@ void rdt_last_cmd_printf(const char *fmt, ...) * limited as the number of resources grows. */ static int closid_free_map; +static int closid_free_map_len; + +int closids_supported(void) +{ + return closid_free_map_len; +} static void closid_init(void) { @@ -111,6 +117,7 @@ static void closid_init(void) /* CLOSID 0 is always reserved for the default group */ closid_free_map &= ~1; + closid_free_map_len = rdt_min_closid; } static int closid_alloc(void)
