initial_commit

1 files changed, 197 insertions, 0 deletions

diff --git a/drivers/base/topology.c b/drivers/base/topology.c
new file mode 100644
index 00000000..f6f37a05
--- /dev/null
+++ b/drivers/base/topology.c
@@ -0,0 +1,197 @@
+/*
+ * driver/base/topology.c - Populate sysfs with cpu topology information
+ *
+ * Written by: Zhang Yanmin, Intel Corporation
+ *
+ * Copyright (C) 2006, Intel Corp.
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+#include <linux/sysdev.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/cpu.h>
+#include <linux/module.h>
+#include <linux/hardirq.h>
+#include <linux/topology.h>
+
+#define define_one_ro_named(_name, _func)				\
+static SYSDEV_ATTR(_name, 0444, _func, NULL)
+
+#define define_one_ro(_name)				\
+static SYSDEV_ATTR(_name, 0444, show_##_name, NULL)
+
+#define define_id_show_func(name)				\
+static ssize_t show_##name(struct sys_device *dev,		\
+		struct sysdev_attribute *attr, char *buf)	\
+{								\
+	unsigned int cpu = dev->id;				\
+	return sprintf(buf, "%d\n", topology_##name(cpu));	\
+}
+
+#if defined(topology_thread_cpumask) || defined(topology_core_cpumask) || \
+    defined(topology_book_cpumask)
+static ssize_t show_cpumap(int type, const struct cpumask *mask, char *buf)
+{
+	ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf;
+	int n = 0;
+
+	if (len > 1) {
+		n = type?
+			cpulist_scnprintf(buf, len-2, mask) :
+			cpumask_scnprintf(buf, len-2, mask);
+		buf[n++] = '\n';
+		buf[n] = '\0';
+	}
+	return n;
+}
+#endif
+
+#ifdef arch_provides_topology_pointers
+#define define_siblings_show_map(name)					\
+static ssize_t show_##name(struct sys_device *dev,			\
+			   struct sysdev_attribute *attr, char *buf)	\
+{									\
+	unsigned int cpu = dev->id;					\
+	return show_cpumap(0, topology_##name(cpu), buf);		\
+}
+
+#define define_siblings_show_list(name)					\
+static ssize_t show_##name##_list(struct sys_device *dev,		\
+				  struct sysdev_attribute *attr,	\
+				  char *buf)				\
+{									\
+	unsigned int cpu = dev->id;					\
+	return show_cpumap(1, topology_##name(cpu), buf);		\
+}
+
+#else
+#define define_siblings_show_map(name)					\
+static ssize_t show_##name(struct sys_device *dev,			\
+			   struct sysdev_attribute *attr, char *buf)	\
+{									\
+	return show_cpumap(0, topology_##name(dev->id), buf);		\
+}
+
+#define define_siblings_show_list(name)					\
+static ssize_t show_##name##_list(struct sys_device *dev,		\
+				  struct sysdev_attribute *attr,	\
+				  char *buf)				\
+{									\
+	return show_cpumap(1, topology_##name(dev->id), buf);		\
+}
+#endif
+
+#define define_siblings_show_func(name)		\
+	define_siblings_show_map(name); define_siblings_show_list(name)
+
+define_id_show_func(physical_package_id);
+define_one_ro(physical_package_id);
+
+define_id_show_func(core_id);
+define_one_ro(core_id);
+
+define_siblings_show_func(thread_cpumask);
+define_one_ro_named(thread_siblings, show_thread_cpumask);
+define_one_ro_named(thread_siblings_list, show_thread_cpumask_list);
+
+define_siblings_show_func(core_cpumask);
+define_one_ro_named(core_siblings, show_core_cpumask);
+define_one_ro_named(core_siblings_list, show_core_cpumask_list);
+
+#ifdef CONFIG_SCHED_BOOK
+define_id_show_func(book_id);
+define_one_ro(book_id);
+define_siblings_show_func(book_cpumask);
+define_one_ro_named(book_siblings, show_book_cpumask);
+define_one_ro_named(book_siblings_list, show_book_cpumask_list);
+#endif
+
+static struct attribute *default_attrs[] = {
+	&attr_physical_package_id.attr,
+	&attr_core_id.attr,
+	&attr_thread_siblings.attr,
+	&attr_thread_siblings_list.attr,
+	&attr_core_siblings.attr,
+	&attr_core_siblings_list.attr,
+#ifdef CONFIG_SCHED_BOOK
+	&attr_book_id.attr,
+	&attr_book_siblings.attr,
+	&attr_book_siblings_list.attr,
+#endif
+	NULL
+};
+
+static struct attribute_group topology_attr_group = {
+	.attrs = default_attrs,
+	.name = "topology"
+};
+
+/* Add/Remove cpu_topology interface for CPU device */
+static int __cpuinit topology_add_dev(unsigned int cpu)
+{
+	struct sys_device *sys_dev = get_cpu_sysdev(cpu);
+
+	return sysfs_create_group(&sys_dev->kobj, &topology_attr_group);
+}
+
+static void __cpuinit topology_remove_dev(unsigned int cpu)
+{
+	struct sys_device *sys_dev = get_cpu_sysdev(cpu);
+
+	sysfs_remove_group(&sys_dev->kobj, &topology_attr_group);
+}
+
+static int __cpuinit topology_cpu_callback(struct notifier_block *nfb,
+					   unsigned long action, void *hcpu)
+{
+	unsigned int cpu = (unsigned long)hcpu;
+	int rc = 0;
+
+	switch (action) {
+	case CPU_UP_PREPARE:
+	case CPU_UP_PREPARE_FROZEN:
+		rc = topology_add_dev(cpu);
+		break;
+	case CPU_UP_CANCELED:
+	case CPU_UP_CANCELED_FROZEN:
+	case CPU_DEAD:
+	case CPU_DEAD_FROZEN:
+		topology_remove_dev(cpu);
+		break;
+	}
+	return notifier_from_errno(rc);
+}
+
+static int __cpuinit topology_sysfs_init(void)
+{
+	int cpu;
+	int rc;
+
+	for_each_online_cpu(cpu) {
+		rc = topology_add_dev(cpu);
+		if (rc)
+			return rc;
+	}
+	hotcpu_notifier(topology_cpu_callback, 0);
+
+	return 0;
+}
+
+device_initcall(topology_sysfs_init);