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authorFenghua Yu <fenghua.yu@intel.com>2016-10-22 16:19:49 +0300
committerThomas Gleixner <tglx@linutronix.de>2016-10-27 00:12:37 +0300
commite9a2ea5a1ba09c35258f3663842fb8d8cf2e00c2 (patch)
tree07a86bc4db32b68dbaca07a62c54b2f14e19db59 /include/linux/cacheinfo.h
parent1d78dc59f5ab6f467e49882518453adc7e4caa44 (diff)
downloadlinux-e9a2ea5a1ba09c35258f3663842fb8d8cf2e00c2.tar.xz
cacheinfo: Introduce cache id
Cache management software needs an id for each instance of a cache of a particular type. The current cacheinfo structure does not provide any information about the underlying hardware so there is no way to expose it. Hardware with cache management features provides means (cpuid, enumeration etc.) to retrieve the hardware id of a particular cache instance. Cache instances which share hardware have the same hardware id. Add an 'id' field to struct cacheinfo to store this information. Expose this information under the /sys/devices/system/cpu/cpu*/cache/index*/ directory as well. Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Cc: "Ravi V Shankar" <ravi.v.shankar@intel.com> Cc: "Tony Luck" <tony.luck@intel.com> Cc: "David Carrillo-Cisneros" <davidcc@google.com> Cc: "Sai Prakhya" <sai.praneeth.prakhya@intel.com> Cc: "Peter Zijlstra" <peterz@infradead.org> Cc: "Stephane Eranian" <eranian@google.com> Cc: "Dave Hansen" <dave.hansen@intel.com> Cc: "Shaohua Li" <shli@fb.com> Cc: "Nilay Vaish" <nilayvaish@gmail.com> Cc: "Vikas Shivappa" <vikas.shivappa@linux.intel.com> Cc: "Ingo Molnar" <mingo@elte.hu> Cc: "Borislav Petkov" <bp@suse.de> Cc: "H. Peter Anvin" <h.peter.anvin@intel.com> Link: http://lkml.kernel.org/r/1477142405-32078-3-git-send-email-fenghua.yu@intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/cacheinfo.h')
-rw-r--r--include/linux/cacheinfo.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h
index 2189935075b4..0bcbb674da9d 100644
--- a/include/linux/cacheinfo.h
+++ b/include/linux/cacheinfo.h
@@ -18,6 +18,7 @@ enum cache_type {
/**
* struct cacheinfo - represent a cache leaf node
+ * @id: This cache's id. It is unique among caches with the same (type, level).
* @type: type of the cache - data, inst or unified
* @level: represents the hierarchy in the multi-level cache
* @coherency_line_size: size of each cache line usually representing
@@ -44,6 +45,7 @@ enum cache_type {
* keeping, the remaining members form the core properties of the cache
*/
struct cacheinfo {
+ unsigned int id;
enum cache_type type;
unsigned int level;
unsigned int coherency_line_size;
@@ -61,6 +63,7 @@ struct cacheinfo {
#define CACHE_WRITE_ALLOCATE BIT(3)
#define CACHE_ALLOCATE_POLICY_MASK \
(CACHE_READ_ALLOCATE | CACHE_WRITE_ALLOCATE)
+#define CACHE_ID BIT(4)
struct device_node *of_node;
bool disable_sysfs;