From: James Morse <james.morse@arm.com> maillist inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8T2RT Reference: https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git/log/?h=mpam/... --------------------------- MPAM needs to know the size of a cache associated with a particular CPU. The DT/ACPI agnostic way of doing this is to ask cacheinfo. Add a helper to do this. Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Zeng Heng <zengheng4@huawei.com> --- include/linux/cacheinfo.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h index 2802406bb422..251e8b393ec7 100644 --- a/include/linux/cacheinfo.h +++ b/include/linux/cacheinfo.h @@ -133,6 +133,27 @@ static inline unsigned long get_cpu_cacheinfo_id(int cpu, int level) return ~0UL; } +/* + * Get the size of the cache associated with @cpu at level @level. + * cpuhp lock must be held. + */ +static inline unsigned int get_cpu_cacheinfo_size(int cpu, int level) +{ + struct cpu_cacheinfo *ci = get_cpu_cacheinfo(cpu); + int i; + + if (!ci->info_list) + return 0; + + for (i = 0; i < ci->num_leaves; i++) { + if (ci->info_list[i].level == level) { + return ci->info_list[i].size; + } + } + + return 0; +} + #ifdef CONFIG_ARM64 #define use_arch_cache_info() (true) #else -- 2.25.1