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Message-Id: <1409763617-17074-7-git-send-email-sudeep.holla@arm.com>
Date: Wed, 3 Sep 2014 18:00:12 +0100
From: Sudeep Holla <sudeep.holla@....com>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Sudeep Holla <sudeep.holla@....com>,
Heiko Carstens <heiko.carstens@...ibm.com>,
Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Martin Schwidefsky <schwidefsky@...ibm.com>,
linux390@...ibm.com, linux-s390@...r.kernel.org
Subject: [PATCH v4 06/11] s390: move cacheinfo sysfs to generic cacheinfo infrastructure
From: Sudeep Holla <sudeep.holla@....com>
This patch removes the redundant sysfs cacheinfo code by making use of
the newly introduced generic cacheinfo infrastructure.
Signed-off-by: Sudeep Holla <sudeep.holla@....com>
Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
Cc: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: linux390@...ibm.com
Cc: linux-s390@...r.kernel.org
---
arch/s390/kernel/cache.c | 388 +++++++++++------------------------------------
1 file changed, 92 insertions(+), 296 deletions(-)
diff --git a/arch/s390/kernel/cache.c b/arch/s390/kernel/cache.c
index c0b03c28d157..fe21f074cf9f 100644
--- a/arch/s390/kernel/cache.c
+++ b/arch/s390/kernel/cache.c
@@ -5,37 +5,11 @@
* Author(s): Heiko Carstens <heiko.carstens@...ibm.com>
*/
-#include <linux/notifier.h>
#include <linux/seq_file.h>
-#include <linux/init.h>
-#include <linux/list.h>
-#include <linux/slab.h>
#include <linux/cpu.h>
+#include <linux/cacheinfo.h>
#include <asm/facility.h>
-struct cache {
- unsigned long size;
- unsigned int line_size;
- unsigned int associativity;
- unsigned int nr_sets;
- unsigned int level : 3;
- unsigned int type : 2;
- unsigned int private : 1;
- struct list_head list;
-};
-
-struct cache_dir {
- struct kobject *kobj;
- struct cache_index_dir *index;
-};
-
-struct cache_index_dir {
- struct kobject kobj;
- int cpu;
- struct cache *cache;
- struct cache_index_dir *next;
-};
-
enum {
CACHE_SCOPE_NOTEXISTS,
CACHE_SCOPE_PRIVATE,
@@ -44,10 +18,10 @@ enum {
};
enum {
- CACHE_TYPE_SEPARATE,
- CACHE_TYPE_DATA,
- CACHE_TYPE_INSTRUCTION,
- CACHE_TYPE_UNIFIED,
+ CTYPE_SEPARATE,
+ CTYPE_DATA,
+ CTYPE_INSTRUCTION,
+ CTYPE_UNIFIED,
};
enum {
@@ -70,39 +44,59 @@ struct cache_info {
};
#define CACHE_MAX_LEVEL 8
-
union cache_topology {
struct cache_info ci[CACHE_MAX_LEVEL];
unsigned long long raw;
};
static const char * const cache_type_string[] = {
- "Data",
+ "",
"Instruction",
+ "Data",
+ "",
"Unified",
};
-static struct cache_dir *cache_dir_cpu[NR_CPUS];
-static LIST_HEAD(cache_list);
+static const enum cache_type cache_type_map[] = {
+ [CTYPE_SEPARATE] = CACHE_TYPE_SEPARATE,
+ [CTYPE_DATA] = CACHE_TYPE_DATA,
+ [CTYPE_INSTRUCTION] = CACHE_TYPE_INST,
+ [CTYPE_UNIFIED] = CACHE_TYPE_UNIFIED,
+};
void show_cacheinfo(struct seq_file *m)
{
- struct cache *cache;
- int index = 0;
+ int cpu = smp_processor_id(), idx;
+ struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
+ struct cacheinfo *cache;
- list_for_each_entry(cache, &cache_list, list) {
- seq_printf(m, "cache%-11d: ", index);
+ for (idx = 0; idx < this_cpu_ci->num_leaves; idx++) {
+ cache = this_cpu_ci->info_list + idx;
+ seq_printf(m, "cache%-11d: ", idx);
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_printf(m, "scope=%s ",
+ cache->disable_sysfs ? "Shared" : "Private");
+ seq_printf(m, "size=%dK ", cache->size >> 10);
+ seq_printf(m, "line_size=%u ", cache->coherency_line_size);
+ seq_printf(m, "associativity=%d", cache->ways_of_associativity);
seq_puts(m, "\n");
- index++;
}
}
+static inline enum cache_type get_cache_type(struct cache_info *ci, int level)
+{
+ if (level >= CACHE_MAX_LEVEL)
+ return CACHE_TYPE_NOCACHE;
+
+ ci += level;
+
+ if (ci->scope != CACHE_SCOPE_SHARED && ci->scope != CACHE_SCOPE_PRIVATE)
+ return CACHE_TYPE_NOCACHE;
+
+ return cache_type_map[ci->type];
+}
+
static inline unsigned long ecag(int ai, int li, int ti)
{
unsigned long cmd, val;
@@ -113,277 +107,79 @@ static inline unsigned long ecag(int ai, int li, int ti)
return val;
}
-static int __init cache_add(int level, int private, int type)
+static void ci_leaf_init(struct cacheinfo *this_leaf, int private,
+ enum cache_type type, unsigned int level)
{
- struct cache *cache;
- int ti;
+ int ti, num_sets;
+ int cpu = smp_processor_id();
- cache = kzalloc(sizeof(*cache), GFP_KERNEL);
- if (!cache)
- return -ENOMEM;
- if (type == CACHE_TYPE_INSTRUCTION)
+ if (type == CACHE_TYPE_INST)
ti = CACHE_TI_INSTRUCTION;
else
ti = CACHE_TI_UNIFIED;
- cache->size = ecag(EXTRACT_SIZE, level, ti);
- cache->line_size = ecag(EXTRACT_LINE_SIZE, level, ti);
- 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 - 1;
- list_add_tail(&cache->list, &cache_list);
- return 0;
-}
-
-static void __init cache_build_info(void)
-{
- struct cache *cache, *next;
- union cache_topology ct;
- 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_SHARED:
- private = 0;
- break;
- case CACHE_SCOPE_PRIVATE:
- private = 1;
- break;
- default:
- return;
- }
- if (ct.ci[level].type == CACHE_TYPE_SEPARATE) {
- rc = cache_add(level, private, CACHE_TYPE_DATA);
- rc |= cache_add(level, private, CACHE_TYPE_INSTRUCTION);
- } else {
- rc = cache_add(level, private, ct.ci[level].type);
- }
- if (rc)
- goto error;
- }
- return;
-error:
- list_for_each_entry_safe(cache, next, &cache_list, list) {
- list_del(&cache->list);
- kfree(cache);
- }
-}
-
-static struct cache_dir *cache_create_cache_dir(int cpu)
-{
- struct cache_dir *cache_dir;
- struct kobject *kobj = NULL;
- struct device *dev;
-
- dev = get_cpu_device(cpu);
- if (!dev)
- goto out;
- kobj = kobject_create_and_add("cache", &dev->kobj);
- if (!kobj)
- goto out;
- cache_dir = kzalloc(sizeof(*cache_dir), GFP_KERNEL);
- if (!cache_dir)
- goto out;
- cache_dir->kobj = kobj;
- cache_dir_cpu[cpu] = cache_dir;
- return cache_dir;
-out:
- kobject_put(kobj);
- return NULL;
-}
-
-static struct cache_index_dir *kobj_to_cache_index_dir(struct kobject *kobj)
-{
- return container_of(kobj, struct cache_index_dir, kobj);
-}
-
-static void cache_index_release(struct kobject *kobj)
-{
- struct cache_index_dir *index;
-
- index = kobj_to_cache_index_dir(kobj);
- kfree(index);
-}
-
-static ssize_t cache_index_show(struct kobject *kobj,
- struct attribute *attr, char *buf)
-{
- struct kobj_attribute *kobj_attr;
-
- kobj_attr = container_of(attr, struct kobj_attribute, attr);
- return kobj_attr->show(kobj, kobj_attr, buf);
-}
-
-#define DEFINE_CACHE_ATTR(_name, _format, _value) \
-static ssize_t cache_##_name##_show(struct kobject *kobj, \
- struct kobj_attribute *attr, \
- char *buf) \
-{ \
- struct cache_index_dir *index; \
- \
- index = kobj_to_cache_index_dir(kobj); \
- return sprintf(buf, _format, _value); \
-} \
-static struct kobj_attribute cache_##_name##_attr = \
- __ATTR(_name, 0444, cache_##_name##_show, NULL);
-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]);
-DEFINE_CACHE_ATTR(level, "%d\n", index->cache->level);
+ this_leaf->level = level + 1;
+ this_leaf->type = type;
+ this_leaf->coherency_line_size = ecag(EXTRACT_LINE_SIZE, level, ti);
+ this_leaf->ways_of_associativity = ecag(EXTRACT_ASSOCIATIVITY,
+ level, ti);
+ this_leaf->size = ecag(EXTRACT_SIZE, level, ti);
-static ssize_t shared_cpu_map_func(struct kobject *kobj, int type, char *buf)
-{
- struct cache_index_dir *index;
- int len;
-
- index = kobj_to_cache_index_dir(kobj);
- len = type ?
- cpulist_scnprintf(buf, PAGE_SIZE - 2, cpumask_of(index->cpu)) :
- cpumask_scnprintf(buf, PAGE_SIZE - 2, cpumask_of(index->cpu));
- len += sprintf(&buf[len], "\n");
- return len;
-}
-
-static ssize_t shared_cpu_map_show(struct kobject *kobj,
- struct kobj_attribute *attr, char *buf)
-{
- return shared_cpu_map_func(kobj, 0, buf);
+ num_sets = this_leaf->size / this_leaf->coherency_line_size;
+ num_sets /= this_leaf->ways_of_associativity;
+ this_leaf->number_of_sets = num_sets;
+ cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
+ if (!private)
+ this_leaf->disable_sysfs = true;
}
-static struct kobj_attribute cache_shared_cpu_map_attr =
- __ATTR(shared_cpu_map, 0444, shared_cpu_map_show, NULL);
-static ssize_t shared_cpu_list_show(struct kobject *kobj,
- struct kobj_attribute *attr, char *buf)
+int init_cache_level(unsigned int cpu)
{
- return shared_cpu_map_func(kobj, 1, buf);
-}
-static struct kobj_attribute cache_shared_cpu_list_attr =
- __ATTR(shared_cpu_list, 0444, shared_cpu_list_show, NULL);
-
-static struct attribute *cache_index_default_attrs[] = {
- &cache_type_attr.attr,
- &cache_size_attr.attr,
- &cache_number_of_sets_attr.attr,
- &cache_ways_of_associativity_attr.attr,
- &cache_level_attr.attr,
- &cache_coherency_line_size_attr.attr,
- &cache_shared_cpu_map_attr.attr,
- &cache_shared_cpu_list_attr.attr,
- NULL,
-};
-
-static const struct sysfs_ops cache_index_ops = {
- .show = cache_index_show,
-};
-
-static struct kobj_type cache_index_type = {
- .sysfs_ops = &cache_index_ops,
- .release = cache_index_release,
- .default_attrs = cache_index_default_attrs,
-};
-
-static int cache_create_index_dir(struct cache_dir *cache_dir,
- struct cache *cache, int index, int cpu)
-{
- struct cache_index_dir *index_dir;
- int rc;
-
- index_dir = kzalloc(sizeof(*index_dir), GFP_KERNEL);
- if (!index_dir)
- return -ENOMEM;
- index_dir->cache = cache;
- index_dir->cpu = cpu;
- rc = kobject_init_and_add(&index_dir->kobj, &cache_index_type,
- cache_dir->kobj, "index%d", index);
- if (rc)
- goto out;
- index_dir->next = cache_dir->index;
- cache_dir->index = index_dir;
- return 0;
-out:
- kfree(index_dir);
- return rc;
-}
+ struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
+ unsigned int level = 0, leaves = 0;
+ union cache_topology ct;
+ enum cache_type ctype;
-static int cache_add_cpu(int cpu)
-{
- struct cache_dir *cache_dir;
- struct cache *cache;
- int rc, index = 0;
+ if (!this_cpu_ci)
+ return -EINVAL;
- if (list_empty(&cache_list))
- return 0;
- cache_dir = cache_create_cache_dir(cpu);
- if (!cache_dir)
- return -ENOMEM;
- list_for_each_entry(cache, &cache_list, list) {
- if (!cache->private)
+ ct.raw = ecag(EXTRACT_TOPOLOGY, 0, 0);
+ do {
+ ctype = get_cache_type(&ct.ci[0], level);
+ if (ctype == CACHE_TYPE_NOCACHE)
break;
- rc = cache_create_index_dir(cache_dir, cache, index, cpu);
- if (rc)
- return rc;
- index++;
- }
- return 0;
-}
+ /* Separate instruction and data caches */
+ leaves += (ctype == CACHE_TYPE_SEPARATE) ? 2 : 1;
+ } while (++level < CACHE_MAX_LEVEL);
-static void cache_remove_cpu(int cpu)
-{
- struct cache_index_dir *index, *next;
- struct cache_dir *cache_dir;
+ this_cpu_ci->num_levels = level;
+ this_cpu_ci->num_leaves = leaves;
- cache_dir = cache_dir_cpu[cpu];
- if (!cache_dir)
- return;
- index = cache_dir->index;
- while (index) {
- next = index->next;
- kobject_put(&index->kobj);
- index = next;
- }
- kobject_put(cache_dir->kobj);
- kfree(cache_dir);
- cache_dir_cpu[cpu] = NULL;
+ return 0;
}
-static int cache_hotplug(struct notifier_block *nfb, unsigned long action,
- void *hcpu)
+int populate_cache_leaves(unsigned int cpu)
{
- int cpu = (long)hcpu;
- int rc = 0;
+ unsigned int level, idx, pvt;
+ union cache_topology ct;
+ enum cache_type ctype;
+ struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
+ struct cacheinfo *this_leaf = this_cpu_ci->info_list;
- switch (action & ~CPU_TASKS_FROZEN) {
- case CPU_ONLINE:
- rc = cache_add_cpu(cpu);
- if (rc)
- cache_remove_cpu(cpu);
- break;
- case CPU_DEAD:
- cache_remove_cpu(cpu);
- break;
+ ct.raw = ecag(EXTRACT_TOPOLOGY, 0, 0);
+ for (idx = 0, level = 0; level < this_cpu_ci->num_levels &&
+ idx < this_cpu_ci->num_leaves; idx++, level++) {
+ if (!this_leaf)
+ return -EINVAL;
+
+ pvt = (ct.ci[level].scope == CACHE_SCOPE_PRIVATE) ? 1 : 0;
+ ctype = get_cache_type(&ct.ci[0], level);
+ if (ctype == CACHE_TYPE_SEPARATE) {
+ ci_leaf_init(this_leaf++, pvt, CACHE_TYPE_DATA, level);
+ ci_leaf_init(this_leaf++, pvt, CACHE_TYPE_INST, level);
+ } else {
+ ci_leaf_init(this_leaf++, pvt, ctype, level);
+ }
}
- return rc ? NOTIFY_BAD : NOTIFY_OK;
-}
-
-static int __init cache_init(void)
-{
- int cpu;
-
- if (!test_facility(34))
- return 0;
- cache_build_info();
-
- cpu_notifier_register_begin();
- for_each_online_cpu(cpu)
- cache_add_cpu(cpu);
- __hotcpu_notifier(cache_hotplug, 0);
- cpu_notifier_register_done();
return 0;
}
-device_initcall(cache_init);
--
1.8.3.2
--
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