static DEFINE_PER_CPU(struct cpu, cpu_devices);
+static DEFINE_PER_CPU(struct kobject *, cache_toplevel);
+
/* SMT stuff */
#ifdef CONFIG_PPC_MULTIPLATFORM
#endif /* CONFIG_DEBUG_KERNEL */
};
+struct cache_desc {
+ struct kobject kobj;
+ struct cache_desc *next;
+ const char *type; /* Instruction, Data, or Unified */
+ u32 size; /* total cache size in KB */
+ u32 line_size; /* in bytes */
+ u32 nr_sets; /* number of sets */
+ u32 level; /* e.g. 1, 2, 3... */
+ u32 associativity; /* e.g. 8-way... 0 is fully associative */
+};
+
+DEFINE_PER_CPU(struct cache_desc *, cache_desc);
+
+static struct cache_desc *kobj_to_cache_desc(struct kobject *k)
+{
+ return container_of(k, struct cache_desc, kobj);
+}
+
+static void cache_desc_release(struct kobject *k)
+{
+ struct cache_desc *desc = kobj_to_cache_desc(k);
+
+ pr_debug("%s: releasing %s\n", __func__, kobject_name(k));
+
+ if (desc->next)
+ kobject_put(&desc->next->kobj);
+
+ kfree(kobj_to_cache_desc(k));
+}
+
+static ssize_t cache_desc_show(struct kobject *k, struct attribute *attr, char *buf)
+{
+ struct kobj_attribute *kobj_attr;
+
+ kobj_attr = container_of(attr, struct kobj_attribute, attr);
+
+ return kobj_attr->show(k, kobj_attr, buf);
+}
+
+static struct sysfs_ops cache_desc_sysfs_ops = {
+ .show = cache_desc_show,
+};
+
+static struct kobj_type cache_desc_type = {
+ .release = cache_desc_release,
+ .sysfs_ops = &cache_desc_sysfs_ops,
+};
+
+static ssize_t cache_size_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
+{
+ struct cache_desc *cache = kobj_to_cache_desc(k);
+
+ return sprintf(buf, "%uK\n", cache->size);
+}
+
+static struct kobj_attribute cache_size_attr =
+ __ATTR(size, 0444, cache_size_show, NULL);
+
+static ssize_t cache_line_size_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
+{
+ struct cache_desc *cache = kobj_to_cache_desc(k);
+
+ return sprintf(buf, "%u\n", cache->line_size);
+}
+
+static struct kobj_attribute cache_line_size_attr =
+ __ATTR(coherency_line_size, 0444, cache_line_size_show, NULL);
+
+static ssize_t cache_nr_sets_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
+{
+ struct cache_desc *cache = kobj_to_cache_desc(k);
+
+ return sprintf(buf, "%u\n", cache->nr_sets);
+}
+
+static struct kobj_attribute cache_nr_sets_attr =
+ __ATTR(number_of_sets, 0444, cache_nr_sets_show, NULL);
+
+static ssize_t cache_type_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
+{
+ struct cache_desc *cache = kobj_to_cache_desc(k);
+
+ return sprintf(buf, "%s\n", cache->type);
+}
+
+static struct kobj_attribute cache_type_attr =
+ __ATTR(type, 0444, cache_type_show, NULL);
+
+static ssize_t cache_level_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
+{
+ struct cache_desc *cache = kobj_to_cache_desc(k);
+
+ return sprintf(buf, "%u\n", cache->level);
+}
+
+static struct kobj_attribute cache_level_attr =
+ __ATTR(level, 0444, cache_level_show, NULL);
+
+static ssize_t cache_assoc_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
+{
+ struct cache_desc *cache = kobj_to_cache_desc(k);
+
+ return sprintf(buf, "%u\n", cache->associativity);
+}
+
+static struct kobj_attribute cache_assoc_attr =
+ __ATTR(ways_of_associativity, 0444, cache_assoc_show, NULL);
+
+struct cache_desc_info {
+ const char *type;
+ const char *size_prop;
+ const char *line_size_prop;
+ const char *nr_sets_prop;
+};
+
+/* PowerPC Processor binding says the [di]-cache-* must be equal on
+ * unified caches, so just use d-cache properties. */
+static struct cache_desc_info ucache_info = {
+ .type = "Unified",
+ .size_prop = "d-cache-size",
+ .line_size_prop = "d-cache-line-size",
+ .nr_sets_prop = "d-cache-sets",
+};
+
+static struct cache_desc_info dcache_info = {
+ .type = "Data",
+ .size_prop = "d-cache-size",
+ .line_size_prop = "d-cache-line-size",
+ .nr_sets_prop = "d-cache-sets",
+};
+
+static struct cache_desc_info icache_info = {
+ .type = "Instruction",
+ .size_prop = "i-cache-size",
+ .line_size_prop = "i-cache-line-size",
+ .nr_sets_prop = "i-cache-sets",
+};
+
+static struct cache_desc * __cpuinit create_cache_desc(struct device_node *np, struct kobject *parent, int index, int level, struct cache_desc_info *info)
+{
+ const u32 *cache_line_size;
+ struct cache_desc *new;
+ const u32 *cache_size;
+ const u32 *nr_sets;
+ int rc;
+
+ new = kzalloc(sizeof(*new), GFP_KERNEL);
+ if (!new)
+ return NULL;
+
+ rc = kobject_init_and_add(&new->kobj, &cache_desc_type, parent,
+ "index%d", index);
+ if (rc)
+ goto err;
+
+ /* type */
+ new->type = info->type;
+ rc = sysfs_create_file(&new->kobj, &cache_type_attr.attr);
+ WARN_ON(rc);
+
+ /* level */
+ new->level = level;
+ rc = sysfs_create_file(&new->kobj, &cache_level_attr.attr);
+ WARN_ON(rc);
+
+ /* size */
+ cache_size = of_get_property(np, info->size_prop, NULL);
+ if (cache_size) {
+ new->size = *cache_size / 1024;
+ rc = sysfs_create_file(&new->kobj,
+ &cache_size_attr.attr);
+ WARN_ON(rc);
+ }
+
+ /* coherency_line_size */
+ cache_line_size = of_get_property(np, info->line_size_prop, NULL);
+ if (cache_line_size) {
+ new->line_size = *cache_line_size;
+ rc = sysfs_create_file(&new->kobj,
+ &cache_line_size_attr.attr);
+ WARN_ON(rc);
+ }
+
+ /* number_of_sets */
+ nr_sets = of_get_property(np, info->nr_sets_prop, NULL);
+ if (nr_sets) {
+ new->nr_sets = *nr_sets;
+ rc = sysfs_create_file(&new->kobj,
+ &cache_nr_sets_attr.attr);
+ WARN_ON(rc);
+ }
+
+ /* ways_of_associativity */
+ if (new->nr_sets == 1) {
+ /* fully associative */
+ new->associativity = 0;
+ goto create_assoc;
+ }
+
+ if (new->nr_sets && new->size && new->line_size) {
+ /* If we have values for all of these we can derive
+ * the associativity. */
+ new->associativity =
+ ((new->size * 1024) / new->nr_sets) / new->line_size;
+create_assoc:
+ rc = sysfs_create_file(&new->kobj,
+ &cache_assoc_attr.attr);
+ WARN_ON(rc);
+ }
+
+ return new;
+err:
+ kfree(new);
+ return NULL;
+}
+
+static bool cache_is_unified(struct device_node *np)
+{
+ return of_get_property(np, "cache-unified", NULL);
+}
+
+static struct cache_desc * __cpuinit create_cache_index_info(struct device_node *np, struct kobject *parent, int index, int level)
+{
+ const phandle *next_cache_phandle;
+ struct device_node *next_cache;
+ struct cache_desc *new, **end;
+
+ pr_debug("%s(node = %s, index = %d)\n", __func__, np->full_name, index);
+
+ if (cache_is_unified(np)) {
+ new = create_cache_desc(np, parent, index, level,
+ &ucache_info);
+ } else {
+ new = create_cache_desc(np, parent, index, level,
+ &dcache_info);
+ if (new) {
+ index++;
+ new->next = create_cache_desc(np, parent, index, level,
+ &icache_info);
+ }
+ }
+ if (!new)
+ return NULL;
+
+ end = &new->next;
+ while (*end)
+ end = &(*end)->next;
+
+ next_cache_phandle = of_get_property(np, "l2-cache", NULL);
+ if (!next_cache_phandle)
+ goto out;
+
+ next_cache = of_find_node_by_phandle(*next_cache_phandle);
+ if (!next_cache)
+ goto out;
+
+ *end = create_cache_index_info(next_cache, parent, ++index, ++level);
+
+ of_node_put(next_cache);
+out:
+ return new;
+}
+
+static void __cpuinit create_cache_info(struct sys_device *sysdev)
+{
+ struct kobject *cache_toplevel;
+ struct device_node *np = NULL;
+ int cpu = sysdev->id;
+
+ cache_toplevel = kobject_create_and_add("cache", &sysdev->kobj);
+ if (!cache_toplevel)
+ return;
+ per_cpu(cache_toplevel, cpu) = cache_toplevel;
+ np = of_get_cpu_node(cpu, NULL);
+ if (np != NULL) {
+ per_cpu(cache_desc, cpu) =
+ create_cache_index_info(np, cache_toplevel, 0, 1);
+ of_node_put(np);
+ }
+ return;
+}
static void __cpuinit register_cpu_online(unsigned int cpu)
{
if (cpu_has_feature(CPU_FTR_DSCR))
sysdev_create_file(s, &attr_dscr);
+
+ create_cache_info(s);
}
#ifdef CONFIG_HOTPLUG_CPU
+static void remove_cache_info(struct sys_device *sysdev)
+{
+ struct kobject *cache_toplevel;
+ struct cache_desc *cache_desc;
+ int cpu = sysdev->id;
+
+ cache_desc = per_cpu(cache_desc, cpu);
+ if (cache_desc != NULL) {
+ sysfs_remove_file(&cache_desc->kobj, &cache_size_attr.attr);
+ sysfs_remove_file(&cache_desc->kobj, &cache_line_size_attr.attr);
+ sysfs_remove_file(&cache_desc->kobj, &cache_type_attr.attr);
+ sysfs_remove_file(&cache_desc->kobj, &cache_level_attr.attr);
+ sysfs_remove_file(&cache_desc->kobj, &cache_nr_sets_attr.attr);
+ sysfs_remove_file(&cache_desc->kobj, &cache_assoc_attr.attr);
+
+ kobject_put(&cache_desc->kobj);
+ }
+ cache_toplevel = per_cpu(cache_toplevel, cpu);
+ if (cache_toplevel != NULL)
+ kobject_put(cache_toplevel);
+}
+
static void unregister_cpu_online(unsigned int cpu)
{
struct cpu *c = &per_cpu(cpu_devices, cpu);
if (cpu_has_feature(CPU_FTR_DSCR))
sysdev_remove_file(s, &attr_dscr);
+
+ remove_cache_info(s);
}
#endif /* CONFIG_HOTPLUG_CPU */
projects / mirror_ubuntu-bionic-kernel.git / commitdiff