1 files changed, 310 insertions, 1 deletions

diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c
index 800e5e9a087b..56d172d16e56 100644
--- a/arch/powerpc/kernel/sysfs.c
+++ b/arch/powerpc/kernel/sysfs.c
@@ -22,6 +22,8 @@
 
 static DEFINE_PER_CPU(struct cpu, cpu_devices);
 
+static DEFINE_PER_CPU(struct kobject *, cache_toplevel);
+
 /* SMT stuff */
 
 #ifdef CONFIG_PPC_MULTIPLATFORM
@@ -297,8 +299,289 @@ static struct sysdev_attribute pa6t_attrs[] = {
 #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 void register_cpu_online(unsigned int cpu)
+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)
 {
         struct cpu *c = &per_cpu(cpu_devices, cpu);
         struct sys_device *s = &c->sysdev;
@@ -346,9 +629,33 @@ static void 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);
@@ -399,6 +706,8 @@ static void unregister_cpu_online(unsigned int cpu)
 
         if (cpu_has_feature(CPU_FTR_DSCR))
                 sysdev_remove_file(s, &attr_dscr);
+
+        remove_cache_info(s);
 }
 #endif /* CONFIG_HOTPLUG_CPU */