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s390/cache: add cpu cache information to /proc/cpuinfo 

Add a line for each cpu cache to /proc/cpuinfo.
Since we only have information of private cpu caches in sysfs we
add a line for each cpu cache in /proc/cpuinfo which will also
contain information about shared caches.

For a z196 machine /proc/cpuinfo now looks like:

vendor_id       : IBM/S390
bogomips per cpu: 14367.00
features        : esan3 zarch stfle msa ldisp eimm dfp etf3eh highgprs
cache0          : level=1 type=Data scope=Private size=64K line_size=256 associativity=4
cache1          : level=1 type=Instruction scope=Private size=128K line_size=256 associativity=8
cache2          : level=2 type=Unified scope=Private size=1536K line_size=256 associativity=12
cache3          : level=3 type=Unified scope=Shared size=24576K line_size=256 associativity=12
cache4          : level=4 type=Unified scope=Shared size=196608K line_size=256 associativity=24
processor 0: version = FF,  identification = 000123,  machine = 2817
processor 1: version = FF,  identification = 100123,  machine = 2817
processor 2: version = FF,  identification = 200123,  machine = 2817
processor 3: version = FF,  identification = 200123,  machine = 2817

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2012-08-29 14:12:20 +02:00 committed by Martin Schwidefsky
parent d35339a42d
commit 6668022c7b
3 changed files with 43 additions and 10 deletions
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6
arch/s390/include/asm/processor.h
View File

@ -140,6 +140,12 @@ struct task_struct;
struct mm_struct;
struct seq_file;
#ifdef CONFIG_64BIT
extern void show_cacheinfo(struct seq_file *m);
#else
static inline void show_cacheinfo(struct seq_file *m) { }
#endif
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);

46
arch/s390/kernel/cache.c
View File

@ -6,6 +6,7 @@
*/
#include <linux/notifier.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/slab.h>
@ -17,8 +18,9 @@ struct cache {
unsigned int line_size;
unsigned int associativity;
unsigned int nr_sets;
int level;
int type;
unsigned int level : 3;
unsigned int type : 2;
unsigned int private : 1;
struct list_head list;
};
@ -83,6 +85,24 @@ static const char * const cache_type_string[] = {
static struct cache_dir *cache_dir_cpu[NR_CPUS];
static LIST_HEAD(cache_list);
void show_cacheinfo(struct seq_file *m)
{
struct cache *cache;
int index = 0;
list_for_each_entry(cache, &cache_list, list) {
seq_printf(m, "cache%-11d: ", index);
seq_printf(m, "level=%d ", cache->level);
seq_printf(m, "type=%s ", cache_type_string[cache->type]);
seq_printf(m, "scope=%s ", cache->private ? "Private" : "Shared");
seq_printf(m, "size=%luK ", cache->size >> 10);
seq_printf(m, "line_size=%u ", cache->line_size);
seq_printf(m, "associativity=%d", cache->associativity);
seq_puts(m, "\n");
index++;
}
}
static inline unsigned long ecag(int ai, int li, int ti)
{
unsigned long cmd, val;
@ -93,7 +113,7 @@ static inline unsigned long ecag(int ai, int li, int ti)
return val;
}
static int __init cache_add(int level, int type)
static int __init cache_add(int level, int private, int type)
{
struct cache *cache;
int ti;
@ -107,8 +127,9 @@ static int __init cache_add(int level, int type)
cache->associativity = ecag(EXTRACT_ASSOCIATIVITY, level, ti);
cache->nr_sets = cache->size / cache->associativity;
cache->nr_sets /= cache->line_size;
cache->private = private;
cache->level = level + 1;
cache->type = type;
cache->type = type - 1;
list_add_tail(&cache->list, &cache_list);
return 0;
}
@ -117,23 +138,26 @@ static void __init cache_build_info(void)
{
struct cache *cache, *next;
union cache_topology ct;
int level, rc;
int level, private, rc;
ct.raw = ecag(EXTRACT_TOPOLOGY, 0, 0);
for (level = 0; level < CACHE_MAX_LEVEL; level++) {
switch (ct.ci[level].scope) {
case CACHE_SCOPE_NOTEXISTS:
case CACHE_SCOPE_RESERVED:
case CACHE_SCOPE_SHARED:
return;
case CACHE_SCOPE_SHARED:
private = 0;
break;
case CACHE_SCOPE_PRIVATE:
private = 1;
break;
}
if (ct.ci[level].type == CACHE_TYPE_SEPARATE) {
rc = cache_add(level, CACHE_TYPE_DATA);
rc |= cache_add(level, CACHE_TYPE_INSTRUCTION);
rc = cache_add(level, private, CACHE_TYPE_DATA);
rc |= cache_add(level, private, CACHE_TYPE_INSTRUCTION);
} else {
rc = cache_add(level, ct.ci[level].type);
rc = cache_add(level, private, ct.ci[level].type);
}
if (rc)
goto error;
@ -208,7 +232,7 @@ DEFINE_CACHE_ATTR(size, "%luK\n", index->cache->size >> 10);
DEFINE_CACHE_ATTR(coherency_line_size, "%u\n", index->cache->line_size);
DEFINE_CACHE_ATTR(number_of_sets, "%u\n", index->cache->nr_sets);
DEFINE_CACHE_ATTR(ways_of_associativity, "%u\n", index->cache->associativity);
DEFINE_CACHE_ATTR(type, "%s\n", cache_type_string[index->cache->type - 1]);
DEFINE_CACHE_ATTR(type, "%s\n", cache_type_string[index->cache->type]);
DEFINE_CACHE_ATTR(level, "%d\n", index->cache->level);
static ssize_t shared_cpu_map_func(struct kobject *kobj, int type, char *buf)
@ -298,6 +322,8 @@ static int __cpuinit cache_add_cpu(int cpu)
if (!cache_dir)
return -ENOMEM;
list_for_each_entry(cache, &cache_list, list) {
if (!cache->private)
break;
rc = cache_create_index_dir(cache_dir, cache, index, cpu);
if (rc)
return rc;

1
arch/s390/kernel/processor.c
View File

@ -58,6 +58,7 @@ static int show_cpuinfo(struct seq_file *m, void *v)
if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
seq_printf(m, "%s ", hwcap_str[i]);
seq_puts(m, "\n");
show_cacheinfo(m);
}
get_online_cpus();
if (cpu_online(n)) {