Merge branch 'disintegrate-asm-generic' of git://git.infradead.org/users/dhowells/linux-headers into asm-generic

Patches from David Howells <dhowells@redhat.com>:

This is to complete part of the UAPI disintegration for which the
preparatory patches were pulled recently.

Note that there are some fixup patches which are at the base of the
branch aimed at you, plus all arches get the asm-generic branch merged in too.

* 'disintegrate-asm-generic' of git://git.infradead.org/users/dhowells/linux-headers:
  UAPI: (Scripted) Disintegrate include/asm-generic
  UAPI: Fix conditional header installation handling (notably kvm_para.h on m68k)
  c6x: remove c6x signal.h
  UAPI: Split compound conditionals containing __KERNEL__ in Arm64
  UAPI: Fix the guards on various asm/unistd.h files

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 385 insertions, 0 deletions

diff --git a/arch/s390/kernel/cache.c b/arch/s390/kernel/cache.c
new file mode 100644
index 00000000000..8df8d8a19c9
--- /dev/null
+++ b/arch/s390/kernel/cache.c
@@ -0,0 +1,385 @@
+/*
+ * Extract CPU cache information and expose them via sysfs.
+ *
+ *    Copyright IBM Corp. 2012
+ *    Author(s): Heiko Carstens <heiko.carstens@de.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 <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,
+	CACHE_SCOPE_SHARED,
+	CACHE_SCOPE_RESERVED,
+};
+
+enum {
+	CACHE_TYPE_SEPARATE,
+	CACHE_TYPE_DATA,
+	CACHE_TYPE_INSTRUCTION,
+	CACHE_TYPE_UNIFIED,
+};
+
+enum {
+	EXTRACT_TOPOLOGY,
+	EXTRACT_LINE_SIZE,
+	EXTRACT_SIZE,
+	EXTRACT_ASSOCIATIVITY,
+};
+
+enum {
+	CACHE_TI_UNIFIED = 0,
+	CACHE_TI_INSTRUCTION = 0,
+	CACHE_TI_DATA,
+};
+
+struct cache_info {
+	unsigned char	    : 4;
+	unsigned char scope : 2;
+	unsigned char type  : 2;
+};
+
+#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",
+	"Unified",
+};
+
+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;
+
+	cmd = ai << 4 | li << 1 | ti;
+	asm volatile(".insn	rsy,0xeb000000004c,%0,0,0(%1)" /* ecag */
+		     : "=d" (val) : "a" (cmd));
+	return val;
+}
+
+static int __init cache_add(int level, int private, int type)
+{
+	struct cache *cache;
+	int ti;
+
+	cache = kzalloc(sizeof(*cache), GFP_KERNEL);
+	if (!cache)
+		return -ENOMEM;
+	ti = type == CACHE_TYPE_DATA ? CACHE_TI_DATA : 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_NOTEXISTS:
+		case CACHE_SCOPE_RESERVED:
+			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, 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 *__cpuinit 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);
+
+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);
+}
+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)
+{
+	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 __cpuinit 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;
+}
+
+static int __cpuinit cache_add_cpu(int cpu)
+{
+	struct cache_dir *cache_dir;
+	struct cache *cache;
+	int rc, index = 0;
+
+	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)
+			break;
+		rc = cache_create_index_dir(cache_dir, cache, index, cpu);
+		if (rc)
+			return rc;
+		index++;
+	}
+	return 0;
+}
+
+static void __cpuinit cache_remove_cpu(int cpu)
+{
+	struct cache_index_dir *index, *next;
+	struct cache_dir *cache_dir;
+
+	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;
+}
+
+static int __cpuinit cache_hotplug(struct notifier_block *nfb,
+				   unsigned long action, void *hcpu)
+{
+	int cpu = (long)hcpu;
+	int rc = 0;
+
+	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;
+	}
+	return rc ? NOTIFY_BAD : NOTIFY_OK;
+}
+
+static int __init cache_init(void)
+{
+	int cpu;
+
+	if (!test_facility(34))
+		return 0;
+	cache_build_info();
+	for_each_online_cpu(cpu)
+		cache_add_cpu(cpu);
+	hotcpu_notifier(cache_hotplug, 0);
+	return 0;
+}
+device_initcall(cache_init);