[PATCH 02/33] drivers: base: cacheinfo: Add helper to find the cache size from cpu+level
From: James Morse <james.morse@arm.com>
Date: 2025-08-22 15:34:29
Also in:
linux-acpi, linux-devicetree, lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
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> --- Changes since v1: * Converted to kdoc. * Simplified helper to use get_cpu_cacheinfo_level(). --- include/linux/cacheinfo.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h
index 2dcbb69139e9..e12d6f2c6a57 100644
--- a/include/linux/cacheinfo.h
+++ b/include/linux/cacheinfo.h@@ -148,6 +148,21 @@ static inline int get_cpu_cacheinfo_id(int cpu, int level) return ci ? ci->id : -1; } +/** + * get_cpu_cacheinfo_size() - Get the size of the cache. + * @cpu: The cpu that is associated with the cache. + * @level: The level of the cache as seen by @cpu. + * + * Callers must hold the cpuhp lock. + * Returns the cache-size on success, or 0 for an error. + */ +static inline unsigned int get_cpu_cacheinfo_size(int cpu, int level) +{ + struct cacheinfo *ci = get_cpu_cacheinfo_level(cpu, level); + + return ci ? ci->size : 0; +} + #if defined(CONFIG_ARM64) || defined(CONFIG_ARM) #define use_arch_cache_info() (true) #else
--
2.20.1