summaryrefslogtreecommitdiffstats
path: root/drivers/base/topology.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/base/topology.c')
-rw-r--r--drivers/base/topology.c194
1 files changed, 194 insertions, 0 deletions
diff --git a/drivers/base/topology.c b/drivers/base/topology.c
new file mode 100644
index 000000000..89f98be5c
--- /dev/null
+++ b/drivers/base/topology.c
@@ -0,0 +1,194 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * driver/base/topology.c - Populate sysfs with cpu topology information
+ *
+ * Written by: Zhang Yanmin, Intel Corporation
+ *
+ * Copyright (C) 2006, Intel Corp.
+ *
+ * All rights reserved.
+ */
+#include <linux/mm.h>
+#include <linux/cpu.h>
+#include <linux/module.h>
+#include <linux/hardirq.h>
+#include <linux/topology.h>
+
+#define define_id_show_func(name, fmt) \
+static ssize_t name##_show(struct device *dev, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ return sysfs_emit(buf, fmt "\n", topology_##name(dev->id)); \
+}
+
+#define define_siblings_read_func(name, mask) \
+static ssize_t name##_read(struct file *file, struct kobject *kobj, \
+ struct bin_attribute *attr, char *buf, \
+ loff_t off, size_t count) \
+{ \
+ struct device *dev = kobj_to_dev(kobj); \
+ \
+ return cpumap_print_bitmask_to_buf(buf, topology_##mask(dev->id), \
+ off, count); \
+} \
+ \
+static ssize_t name##_list_read(struct file *file, struct kobject *kobj, \
+ struct bin_attribute *attr, char *buf, \
+ loff_t off, size_t count) \
+{ \
+ struct device *dev = kobj_to_dev(kobj); \
+ \
+ return cpumap_print_list_to_buf(buf, topology_##mask(dev->id), \
+ off, count); \
+}
+
+define_id_show_func(physical_package_id, "%d");
+static DEVICE_ATTR_RO(physical_package_id);
+
+#ifdef TOPOLOGY_DIE_SYSFS
+define_id_show_func(die_id, "%d");
+static DEVICE_ATTR_RO(die_id);
+#endif
+
+#ifdef TOPOLOGY_CLUSTER_SYSFS
+define_id_show_func(cluster_id, "%d");
+static DEVICE_ATTR_RO(cluster_id);
+#endif
+
+define_id_show_func(core_id, "%d");
+static DEVICE_ATTR_RO(core_id);
+
+define_id_show_func(ppin, "0x%llx");
+static DEVICE_ATTR_ADMIN_RO(ppin);
+
+define_siblings_read_func(thread_siblings, sibling_cpumask);
+static BIN_ATTR_RO(thread_siblings, CPUMAP_FILE_MAX_BYTES);
+static BIN_ATTR_RO(thread_siblings_list, CPULIST_FILE_MAX_BYTES);
+
+define_siblings_read_func(core_cpus, sibling_cpumask);
+static BIN_ATTR_RO(core_cpus, CPUMAP_FILE_MAX_BYTES);
+static BIN_ATTR_RO(core_cpus_list, CPULIST_FILE_MAX_BYTES);
+
+define_siblings_read_func(core_siblings, core_cpumask);
+static BIN_ATTR_RO(core_siblings, CPUMAP_FILE_MAX_BYTES);
+static BIN_ATTR_RO(core_siblings_list, CPULIST_FILE_MAX_BYTES);
+
+#ifdef TOPOLOGY_CLUSTER_SYSFS
+define_siblings_read_func(cluster_cpus, cluster_cpumask);
+static BIN_ATTR_RO(cluster_cpus, CPUMAP_FILE_MAX_BYTES);
+static BIN_ATTR_RO(cluster_cpus_list, CPULIST_FILE_MAX_BYTES);
+#endif
+
+#ifdef TOPOLOGY_DIE_SYSFS
+define_siblings_read_func(die_cpus, die_cpumask);
+static BIN_ATTR_RO(die_cpus, CPUMAP_FILE_MAX_BYTES);
+static BIN_ATTR_RO(die_cpus_list, CPULIST_FILE_MAX_BYTES);
+#endif
+
+define_siblings_read_func(package_cpus, core_cpumask);
+static BIN_ATTR_RO(package_cpus, CPUMAP_FILE_MAX_BYTES);
+static BIN_ATTR_RO(package_cpus_list, CPULIST_FILE_MAX_BYTES);
+
+#ifdef TOPOLOGY_BOOK_SYSFS
+define_id_show_func(book_id, "%d");
+static DEVICE_ATTR_RO(book_id);
+define_siblings_read_func(book_siblings, book_cpumask);
+static BIN_ATTR_RO(book_siblings, CPUMAP_FILE_MAX_BYTES);
+static BIN_ATTR_RO(book_siblings_list, CPULIST_FILE_MAX_BYTES);
+#endif
+
+#ifdef TOPOLOGY_DRAWER_SYSFS
+define_id_show_func(drawer_id, "%d");
+static DEVICE_ATTR_RO(drawer_id);
+define_siblings_read_func(drawer_siblings, drawer_cpumask);
+static BIN_ATTR_RO(drawer_siblings, CPUMAP_FILE_MAX_BYTES);
+static BIN_ATTR_RO(drawer_siblings_list, CPULIST_FILE_MAX_BYTES);
+#endif
+
+static struct bin_attribute *bin_attrs[] = {
+ &bin_attr_core_cpus,
+ &bin_attr_core_cpus_list,
+ &bin_attr_thread_siblings,
+ &bin_attr_thread_siblings_list,
+ &bin_attr_core_siblings,
+ &bin_attr_core_siblings_list,
+#ifdef TOPOLOGY_CLUSTER_SYSFS
+ &bin_attr_cluster_cpus,
+ &bin_attr_cluster_cpus_list,
+#endif
+#ifdef TOPOLOGY_DIE_SYSFS
+ &bin_attr_die_cpus,
+ &bin_attr_die_cpus_list,
+#endif
+ &bin_attr_package_cpus,
+ &bin_attr_package_cpus_list,
+#ifdef TOPOLOGY_BOOK_SYSFS
+ &bin_attr_book_siblings,
+ &bin_attr_book_siblings_list,
+#endif
+#ifdef TOPOLOGY_DRAWER_SYSFS
+ &bin_attr_drawer_siblings,
+ &bin_attr_drawer_siblings_list,
+#endif
+ NULL
+};
+
+static struct attribute *default_attrs[] = {
+ &dev_attr_physical_package_id.attr,
+#ifdef TOPOLOGY_DIE_SYSFS
+ &dev_attr_die_id.attr,
+#endif
+#ifdef TOPOLOGY_CLUSTER_SYSFS
+ &dev_attr_cluster_id.attr,
+#endif
+ &dev_attr_core_id.attr,
+#ifdef TOPOLOGY_BOOK_SYSFS
+ &dev_attr_book_id.attr,
+#endif
+#ifdef TOPOLOGY_DRAWER_SYSFS
+ &dev_attr_drawer_id.attr,
+#endif
+ &dev_attr_ppin.attr,
+ NULL
+};
+
+static umode_t topology_is_visible(struct kobject *kobj,
+ struct attribute *attr, int unused)
+{
+ if (attr == &dev_attr_ppin.attr && !topology_ppin(kobj_to_dev(kobj)->id))
+ return 0;
+
+ return attr->mode;
+}
+
+static const struct attribute_group topology_attr_group = {
+ .attrs = default_attrs,
+ .bin_attrs = bin_attrs,
+ .is_visible = topology_is_visible,
+ .name = "topology"
+};
+
+/* Add/Remove cpu_topology interface for CPU device */
+static int topology_add_dev(unsigned int cpu)
+{
+ struct device *dev = get_cpu_device(cpu);
+
+ return sysfs_create_group(&dev->kobj, &topology_attr_group);
+}
+
+static int topology_remove_dev(unsigned int cpu)
+{
+ struct device *dev = get_cpu_device(cpu);
+
+ sysfs_remove_group(&dev->kobj, &topology_attr_group);
+ return 0;
+}
+
+static int __init topology_sysfs_init(void)
+{
+ return cpuhp_setup_state(CPUHP_TOPOLOGY_PREPARE,
+ "base/topology:prepare", topology_add_dev,
+ topology_remove_dev);
+}
+
+device_initcall(topology_sysfs_init);