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Code Issues Releases Wiki Activity

cacheinfo: Move resctrl's get_cache_id() to the cacheinfo header file

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resctrl/core.c defines get_cache_id() for use in its cpu-hotplug
callbacks. This gets the id attribute of the cache at the corresponding
level of a CPU.

Later rework means this private function needs to be shared. Move
it to the header file.

The name conflicts with a different definition in intel_cacheinfo.c,
name it get_cpu_cacheinfo_id() to show its relation with
get_cpu_cacheinfo().

Now this is visible on other architectures, check the id attribute
has actually been set.

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lkml.kernel.org/r/20200708163929.2783-11-james.morse@arm.com
This commit is contained in:
James Morse 2020-07-08 16:39:29 +00:00 committed by Borislav Petkov
parent 316e7f901f
commit 709c436272
2 changed files with 23 additions and 15 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

17
arch/x86/kernel/cpu/resctrl/core.c
View file

@ -350,19 +350,6 @@ static void rdt_get_cdp_l2_config(void)
rdt_get_cdp_config(RDT_RESOURCE_L2, RDT_RESOURCE_L2CODE);
}
static int get_cache_id(int cpu, int level)
{
struct cpu_cacheinfo *ci = get_cpu_cacheinfo(cpu);
int i;
for (i = 0; i < ci->num_leaves; i++) {
if (ci->info_list[i].level == level)
return ci->info_list[i].id;
}
return -1;
}
static void
mba_wrmsr_amd(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)
{
@ -560,7 +547,7 @@ static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_domain *d)
*/
static void domain_add_cpu(int cpu, struct rdt_resource *r)
{
int id = get_cache_id(cpu, r->cache_level);
int id = get_cpu_cacheinfo_id(cpu, r->cache_level);
struct list_head *add_pos = NULL;
struct rdt_domain *d;
@ -606,7 +593,7 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
static void domain_remove_cpu(int cpu, struct rdt_resource *r)
{
int id = get_cache_id(cpu, r->cache_level);
int id = get_cpu_cacheinfo_id(cpu, r->cache_level);
struct rdt_domain *d;
d = rdt_find_domain(r, id, NULL);

21
include/linux/cacheinfo.h
View file

@ -3,6 +3,7 @@
#define _LINUX_CACHEINFO_H
#include <linux/bitops.h>
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/smp.h>
@ -119,4 +120,24 @@ int acpi_find_last_cache_level(unsigned int cpu);
const struct attribute_group *cache_get_priv_group(struct cacheinfo *this_leaf);
/*
* 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;
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;
}
#endif /* _LINUX_CACHEINFO_H */