[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/drivers/base/cpu.c b/ap/os/linux/linux-3.4.x/drivers/base/cpu.c
new file mode 100644
index 0000000..adf937b
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/base/cpu.c
@@ -0,0 +1,337 @@
+/*
+ * CPU subsystem support
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/cpu.h>
+#include <linux/topology.h>
+#include <linux/device.h>
+#include <linux/node.h>
+#include <linux/gfp.h>
+#include <linux/slab.h>
+#include <linux/percpu.h>
+
+#include "base.h"
+
+struct bus_type cpu_subsys = {
+ .name = "cpu",
+ .dev_name = "cpu",
+};
+EXPORT_SYMBOL_GPL(cpu_subsys);
+
+static DEFINE_PER_CPU(struct device *, cpu_sys_devices);
+
+#ifdef CONFIG_HOTPLUG_CPU
+static ssize_t show_online(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct cpu *cpu = container_of(dev, struct cpu, dev);
+
+ return sprintf(buf, "%u\n", !!cpu_online(cpu->dev.id));
+}
+
+static ssize_t __ref store_online(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct cpu *cpu = container_of(dev, struct cpu, dev);
+ ssize_t ret;
+
+ cpu_hotplug_driver_lock();
+ switch (buf[0]) {
+ case '0':
+ ret = cpu_down(cpu->dev.id);
+ if (!ret)
+ kobject_uevent(&dev->kobj, KOBJ_OFFLINE);
+ break;
+ case '1':
+ ret = cpu_up(cpu->dev.id);
+ if (!ret)
+ kobject_uevent(&dev->kobj, KOBJ_ONLINE);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ cpu_hotplug_driver_unlock();
+
+ if (ret >= 0)
+ ret = count;
+ return ret;
+}
+static DEVICE_ATTR(online, 0644, show_online, store_online);
+
+static void __cpuinit register_cpu_control(struct cpu *cpu)
+{
+ device_create_file(&cpu->dev, &dev_attr_online);
+}
+void unregister_cpu(struct cpu *cpu)
+{
+ int logical_cpu = cpu->dev.id;
+
+ unregister_cpu_under_node(logical_cpu, cpu_to_node(logical_cpu));
+
+ device_remove_file(&cpu->dev, &dev_attr_online);
+
+ device_unregister(&cpu->dev);
+ per_cpu(cpu_sys_devices, logical_cpu) = NULL;
+ return;
+}
+
+#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
+static ssize_t cpu_probe_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ return arch_cpu_probe(buf, count);
+}
+
+static ssize_t cpu_release_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ return arch_cpu_release(buf, count);
+}
+
+static DEVICE_ATTR(probe, S_IWUSR, NULL, cpu_probe_store);
+static DEVICE_ATTR(release, S_IWUSR, NULL, cpu_release_store);
+#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
+
+#else /* ... !CONFIG_HOTPLUG_CPU */
+static inline void register_cpu_control(struct cpu *cpu)
+{
+}
+#endif /* CONFIG_HOTPLUG_CPU */
+
+#ifdef CONFIG_KEXEC
+#include <linux/kexec.h>
+
+static ssize_t show_crash_notes(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct cpu *cpu = container_of(dev, struct cpu, dev);
+ ssize_t rc;
+ unsigned long long addr;
+ int cpunum;
+
+ cpunum = cpu->dev.id;
+
+ /*
+ * Might be reading other cpu's data based on which cpu read thread
+ * has been scheduled. But cpu data (memory) is allocated once during
+ * boot up and this data does not change there after. Hence this
+ * operation should be safe. No locking required.
+ */
+ addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpunum));
+ rc = sprintf(buf, "%Lx\n", addr);
+ return rc;
+}
+static DEVICE_ATTR(crash_notes, 0400, show_crash_notes, NULL);
+#endif
+
+/*
+ * Print cpu online, possible, present, and system maps
+ */
+
+struct cpu_attr {
+ struct device_attribute attr;
+ const struct cpumask *const * const map;
+};
+
+static ssize_t show_cpus_attr(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct cpu_attr *ca = container_of(attr, struct cpu_attr, attr);
+ int n = cpulist_scnprintf(buf, PAGE_SIZE-2, *(ca->map));
+
+ buf[n++] = '\n';
+ buf[n] = '\0';
+ return n;
+}
+
+#define _CPU_ATTR(name, map) \
+ { __ATTR(name, 0444, show_cpus_attr, NULL), map }
+
+/* Keep in sync with cpu_subsys_attrs */
+static struct cpu_attr cpu_attrs[] = {
+ _CPU_ATTR(online, &cpu_online_mask),
+ _CPU_ATTR(possible, &cpu_possible_mask),
+ _CPU_ATTR(present, &cpu_present_mask),
+};
+
+/*
+ * Print values for NR_CPUS and offlined cpus
+ */
+static ssize_t print_cpus_kernel_max(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int n = snprintf(buf, PAGE_SIZE-2, "%d\n", NR_CPUS - 1);
+ return n;
+}
+static DEVICE_ATTR(kernel_max, 0444, print_cpus_kernel_max, NULL);
+
+/* arch-optional setting to enable display of offline cpus >= nr_cpu_ids */
+unsigned int total_cpus;
+
+static ssize_t print_cpus_offline(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int n = 0, len = PAGE_SIZE-2;
+ cpumask_var_t offline;
+
+ /* display offline cpus < nr_cpu_ids */
+ if (!alloc_cpumask_var(&offline, GFP_KERNEL))
+ return -ENOMEM;
+ cpumask_andnot(offline, cpu_possible_mask, cpu_online_mask);
+ n = cpulist_scnprintf(buf, len, offline);
+ free_cpumask_var(offline);
+
+ /* display offline cpus >= nr_cpu_ids */
+ if (total_cpus && nr_cpu_ids < total_cpus) {
+ if (n && n < len)
+ buf[n++] = ',';
+
+ if (nr_cpu_ids == total_cpus-1)
+ n += snprintf(&buf[n], len - n, "%d", nr_cpu_ids);
+ else
+ n += snprintf(&buf[n], len - n, "%d-%d",
+ nr_cpu_ids, total_cpus-1);
+ }
+
+ n += snprintf(&buf[n], len - n, "\n");
+ return n;
+}
+static DEVICE_ATTR(offline, 0444, print_cpus_offline, NULL);
+
+static void cpu_device_release(struct device *dev)
+{
+ /*
+ * This is an empty function to prevent the driver core from spitting a
+ * warning at us. Yes, I know this is directly opposite of what the
+ * documentation for the driver core and kobjects say, and the author
+ * of this code has already been publically ridiculed for doing
+ * something as foolish as this. However, at this point in time, it is
+ * the only way to handle the issue of statically allocated cpu
+ * devices. The different architectures will have their cpu device
+ * code reworked to properly handle this in the near future, so this
+ * function will then be changed to correctly free up the memory held
+ * by the cpu device.
+ *
+ * Never copy this way of doing things, or you too will be made fun of
+ * on the linux-kerenl list, you have been warned.
+ */
+}
+
+/*
+ * register_cpu - Setup a sysfs device for a CPU.
+ * @cpu - cpu->hotpluggable field set to 1 will generate a control file in
+ * sysfs for this CPU.
+ * @num - CPU number to use when creating the device.
+ *
+ * Initialize and register the CPU device.
+ */
+int __cpuinit register_cpu(struct cpu *cpu, int num)
+{
+ int error;
+
+ cpu->node_id = cpu_to_node(num);
+ memset(&cpu->dev, 0x00, sizeof(struct device));
+ cpu->dev.id = num;
+ cpu->dev.bus = &cpu_subsys;
+ cpu->dev.release = cpu_device_release;
+#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
+ cpu->dev.bus->uevent = arch_cpu_uevent;
+#endif
+ error = device_register(&cpu->dev);
+ if (!error && cpu->hotpluggable)
+ register_cpu_control(cpu);
+ if (!error)
+ per_cpu(cpu_sys_devices, num) = &cpu->dev;
+ if (!error)
+ register_cpu_under_node(num, cpu_to_node(num));
+
+#ifdef CONFIG_KEXEC
+ if (!error)
+ error = device_create_file(&cpu->dev, &dev_attr_crash_notes);
+#endif
+ return error;
+}
+
+struct device *get_cpu_device(unsigned cpu)
+{
+ if (cpu < nr_cpu_ids && cpu_possible(cpu))
+ return per_cpu(cpu_sys_devices, cpu);
+ else
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(get_cpu_device);
+
+#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
+static DEVICE_ATTR(modalias, 0444, arch_print_cpu_modalias, NULL);
+#endif
+
+static struct attribute *cpu_root_attrs[] = {
+#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
+ &dev_attr_probe.attr,
+ &dev_attr_release.attr,
+#endif
+ &cpu_attrs[0].attr.attr,
+ &cpu_attrs[1].attr.attr,
+ &cpu_attrs[2].attr.attr,
+ &dev_attr_kernel_max.attr,
+ &dev_attr_offline.attr,
+#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
+ &dev_attr_modalias.attr,
+#endif
+ NULL
+};
+
+static struct attribute_group cpu_root_attr_group = {
+ .attrs = cpu_root_attrs,
+};
+
+static const struct attribute_group *cpu_root_attr_groups[] = {
+ &cpu_root_attr_group,
+ NULL,
+};
+
+bool cpu_is_hotpluggable(unsigned cpu)
+{
+ struct device *dev = get_cpu_device(cpu);
+ return dev && container_of(dev, struct cpu, dev)->hotpluggable;
+}
+EXPORT_SYMBOL_GPL(cpu_is_hotpluggable);
+
+#ifdef CONFIG_GENERIC_CPU_DEVICES
+static DEFINE_PER_CPU(struct cpu, cpu_devices);
+#endif
+
+static void __init cpu_dev_register_generic(void)
+{
+#ifdef CONFIG_GENERIC_CPU_DEVICES
+ int i;
+
+ for_each_possible_cpu(i) {
+ if (register_cpu(&per_cpu(cpu_devices, i), i))
+ panic("Failed to register CPU device");
+ }
+#endif
+}
+
+void __init cpu_dev_init(void)
+{
+ if (subsys_system_register(&cpu_subsys, cpu_root_attr_groups))
+ panic("Failed to register CPU subsystem");
+
+ cpu_dev_register_generic();
+
+#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
+ sched_create_sysfs_power_savings_entries(cpu_subsys.dev_root);
+#endif
+}