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cacheinfo: Add function to get cacheinfo for a given CPU and cache level

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Resctrl open codes a search for information about a given cache level in
a couple of places (and more are on the way).

Provide a new inline function get_cpu_cacheinfo_level() in
<linux/cacheinfo.h> to do the search and return a pointer to the
cacheinfo structure.

Add lockdep_assert_cpus_held() to enforce the comment that cpuhp lock
must be held.

Simplify the existing get_cpu_cacheinfo_id() by using this new function
to do the search.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20240610003927.341707-4-tony.luck@intel.com
This commit is contained in:
Tony Luck 2024-06-09 17:39:26 -07:00 committed by Borislav Petkov (AMD)
parent ddefcfdeb5
commit 685cb16740
1 changed files with 26 additions and 11 deletions
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37
include/linux/cacheinfo.h
View File

@ -3,6 +3,7 @@
#define _LINUX_CACHEINFO_H
#include <linux/bitops.h>
#include <linux/cpuhplock.h>
#include <linux/cpumask.h>
#include <linux/smp.h>
@ -112,24 +113,38 @@ int acpi_get_cache_info(unsigned int cpu,
const struct attribute_group *cache_get_priv_group(struct cacheinfo *this_leaf);
/*
* Get the cacheinfo structure for the cache associated with @cpu at
* level @level.
* cpuhp lock must be held.
*/
static inline struct cacheinfo *get_cpu_cacheinfo_level(int cpu, int level)
{
struct cpu_cacheinfo *ci = get_cpu_cacheinfo(cpu);
int i;
lockdep_assert_cpus_held();
for (i = 0; i < ci->num_leaves; i++) {
if (ci->info_list[i].level == level) {
if (ci->info_list[i].attributes & CACHE_ID)
return &ci->info_list[i];
return NULL;
}
}
return NULL;
}
/*
* Get the id of the cache associated with @cpu at level @level.
* cpuhp lock must be held.
*/
static inline int get_cpu_cacheinfo_id(int cpu, int level)
{
struct cpu_cacheinfo *ci = get_cpu_cacheinfo(cpu);
int i;
struct cacheinfo *ci = get_cpu_cacheinfo_level(cpu, level);
for (i = 0; i < ci->num_leaves; i++) {
if (ci->info_list[i].level == level) {
if (ci->info_list[i].attributes & CACHE_ID)
return ci->info_list[i].id;
return -1;
}
}
return -1;
return ci ? ci->id : -1;
}
#ifdef CONFIG_ARM64