![Andrew Morton](/assets/img/avatar_default.png)
drivers/base/memory.c: In function 'memory_block_change_state': drivers/base/memory.c:281: warning: unused variable 'i' less beer, more testing Cc: Anton Blanchard <anton@samba.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
678 lines
16 KiB
C
678 lines
16 KiB
C
/*
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* drivers/base/memory.c - basic Memory class support
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*
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* Written by Matt Tolentino <matthew.e.tolentino@intel.com>
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* Dave Hansen <haveblue@us.ibm.com>
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*
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* This file provides the necessary infrastructure to represent
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* a SPARSEMEM-memory-model system's physical memory in /sysfs.
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* All arch-independent code that assumes MEMORY_HOTPLUG requires
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* SPARSEMEM should be contained here, or in mm/memory_hotplug.c.
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*/
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#include <linux/sysdev.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/topology.h>
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#include <linux/capability.h>
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#include <linux/device.h>
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#include <linux/memory.h>
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#include <linux/kobject.h>
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#include <linux/memory_hotplug.h>
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#include <linux/mm.h>
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#include <linux/mutex.h>
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#include <linux/stat.h>
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#include <linux/slab.h>
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#include <asm/atomic.h>
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#include <asm/uaccess.h>
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static DEFINE_MUTEX(mem_sysfs_mutex);
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#define MEMORY_CLASS_NAME "memory"
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#define MIN_MEMORY_BLOCK_SIZE (1 << SECTION_SIZE_BITS)
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static int sections_per_block;
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static inline int base_memory_block_id(int section_nr)
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{
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return section_nr / sections_per_block;
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}
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static struct sysdev_class memory_sysdev_class = {
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.name = MEMORY_CLASS_NAME,
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};
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static const char *memory_uevent_name(struct kset *kset, struct kobject *kobj)
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{
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return MEMORY_CLASS_NAME;
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}
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static int memory_uevent(struct kset *kset, struct kobject *obj,
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struct kobj_uevent_env *env)
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{
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int retval = 0;
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return retval;
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}
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static const struct kset_uevent_ops memory_uevent_ops = {
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.name = memory_uevent_name,
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.uevent = memory_uevent,
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};
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static BLOCKING_NOTIFIER_HEAD(memory_chain);
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int register_memory_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&memory_chain, nb);
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}
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EXPORT_SYMBOL(register_memory_notifier);
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void unregister_memory_notifier(struct notifier_block *nb)
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{
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blocking_notifier_chain_unregister(&memory_chain, nb);
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}
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EXPORT_SYMBOL(unregister_memory_notifier);
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static ATOMIC_NOTIFIER_HEAD(memory_isolate_chain);
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int register_memory_isolate_notifier(struct notifier_block *nb)
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{
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return atomic_notifier_chain_register(&memory_isolate_chain, nb);
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}
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EXPORT_SYMBOL(register_memory_isolate_notifier);
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void unregister_memory_isolate_notifier(struct notifier_block *nb)
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{
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atomic_notifier_chain_unregister(&memory_isolate_chain, nb);
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}
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EXPORT_SYMBOL(unregister_memory_isolate_notifier);
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/*
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* register_memory - Setup a sysfs device for a memory block
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*/
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static
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int register_memory(struct memory_block *memory)
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{
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int error;
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memory->sysdev.cls = &memory_sysdev_class;
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memory->sysdev.id = memory->start_section_nr / sections_per_block;
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error = sysdev_register(&memory->sysdev);
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return error;
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}
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static void
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unregister_memory(struct memory_block *memory)
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{
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BUG_ON(memory->sysdev.cls != &memory_sysdev_class);
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/* drop the ref. we got in remove_memory_block() */
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kobject_put(&memory->sysdev.kobj);
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sysdev_unregister(&memory->sysdev);
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}
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unsigned long __weak memory_block_size_bytes(void)
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{
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return MIN_MEMORY_BLOCK_SIZE;
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}
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static unsigned long get_memory_block_size(void)
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{
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unsigned long block_sz;
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block_sz = memory_block_size_bytes();
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/* Validate blk_sz is a power of 2 and not less than section size */
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if ((block_sz & (block_sz - 1)) || (block_sz < MIN_MEMORY_BLOCK_SIZE)) {
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WARN_ON(1);
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block_sz = MIN_MEMORY_BLOCK_SIZE;
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}
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return block_sz;
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}
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/*
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* use this as the physical section index that this memsection
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* uses.
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*/
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static ssize_t show_mem_start_phys_index(struct sys_device *dev,
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struct sysdev_attribute *attr, char *buf)
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{
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struct memory_block *mem =
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container_of(dev, struct memory_block, sysdev);
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unsigned long phys_index;
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phys_index = mem->start_section_nr / sections_per_block;
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return sprintf(buf, "%08lx\n", phys_index);
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}
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static ssize_t show_mem_end_phys_index(struct sys_device *dev,
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struct sysdev_attribute *attr, char *buf)
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{
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struct memory_block *mem =
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container_of(dev, struct memory_block, sysdev);
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unsigned long phys_index;
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phys_index = mem->end_section_nr / sections_per_block;
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return sprintf(buf, "%08lx\n", phys_index);
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}
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/*
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* Show whether the section of memory is likely to be hot-removable
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*/
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static ssize_t show_mem_removable(struct sys_device *dev,
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struct sysdev_attribute *attr, char *buf)
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{
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unsigned long i, pfn;
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int ret = 1;
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struct memory_block *mem =
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container_of(dev, struct memory_block, sysdev);
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for (i = 0; i < sections_per_block; i++) {
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pfn = section_nr_to_pfn(mem->start_section_nr + i);
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ret &= is_mem_section_removable(pfn, PAGES_PER_SECTION);
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}
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return sprintf(buf, "%d\n", ret);
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}
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/*
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* online, offline, going offline, etc.
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*/
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static ssize_t show_mem_state(struct sys_device *dev,
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struct sysdev_attribute *attr, char *buf)
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{
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struct memory_block *mem =
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container_of(dev, struct memory_block, sysdev);
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ssize_t len = 0;
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/*
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* We can probably put these states in a nice little array
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* so that they're not open-coded
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*/
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switch (mem->state) {
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case MEM_ONLINE:
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len = sprintf(buf, "online\n");
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break;
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case MEM_OFFLINE:
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len = sprintf(buf, "offline\n");
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break;
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case MEM_GOING_OFFLINE:
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len = sprintf(buf, "going-offline\n");
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break;
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default:
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len = sprintf(buf, "ERROR-UNKNOWN-%ld\n",
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mem->state);
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WARN_ON(1);
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break;
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}
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return len;
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}
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int memory_notify(unsigned long val, void *v)
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{
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return blocking_notifier_call_chain(&memory_chain, val, v);
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}
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int memory_isolate_notify(unsigned long val, void *v)
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{
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return atomic_notifier_call_chain(&memory_isolate_chain, val, v);
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}
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/*
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* MEMORY_HOTPLUG depends on SPARSEMEM in mm/Kconfig, so it is
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* OK to have direct references to sparsemem variables in here.
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*/
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static int
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memory_block_action(unsigned long phys_index, unsigned long action)
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{
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int i;
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unsigned long start_pfn, start_paddr;
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unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block;
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struct page *first_page;
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int ret;
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first_page = pfn_to_page(phys_index << PFN_SECTION_SHIFT);
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/*
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* The probe routines leave the pages reserved, just
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* as the bootmem code does. Make sure they're still
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* that way.
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*/
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if (action == MEM_ONLINE) {
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for (i = 0; i < nr_pages; i++) {
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if (PageReserved(first_page+i))
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continue;
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printk(KERN_WARNING "section number %ld page number %d "
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"not reserved, was it already online?\n",
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phys_index, i);
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return -EBUSY;
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}
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}
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switch (action) {
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case MEM_ONLINE:
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start_pfn = page_to_pfn(first_page);
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ret = online_pages(start_pfn, nr_pages);
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break;
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case MEM_OFFLINE:
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start_paddr = page_to_pfn(first_page) << PAGE_SHIFT;
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ret = remove_memory(start_paddr,
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nr_pages << PAGE_SHIFT);
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break;
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default:
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WARN(1, KERN_WARNING "%s(%ld, %ld) unknown action: "
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"%ld\n", __func__, phys_index, action, action);
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ret = -EINVAL;
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}
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return ret;
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}
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static int memory_block_change_state(struct memory_block *mem,
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unsigned long to_state, unsigned long from_state_req)
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{
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int ret = 0;
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mutex_lock(&mem->state_mutex);
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if (mem->state != from_state_req) {
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ret = -EINVAL;
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goto out;
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}
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if (to_state == MEM_OFFLINE)
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mem->state = MEM_GOING_OFFLINE;
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ret = memory_block_action(mem->start_section_nr, to_state);
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if (ret)
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mem->state = from_state_req;
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else
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mem->state = to_state;
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out:
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mutex_unlock(&mem->state_mutex);
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return ret;
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}
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static ssize_t
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store_mem_state(struct sys_device *dev,
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struct sysdev_attribute *attr, const char *buf, size_t count)
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{
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struct memory_block *mem;
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int ret = -EINVAL;
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mem = container_of(dev, struct memory_block, sysdev);
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if (!strncmp(buf, "online", min((int)count, 6)))
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ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE);
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else if(!strncmp(buf, "offline", min((int)count, 7)))
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ret = memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE);
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if (ret)
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return ret;
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return count;
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}
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/*
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* phys_device is a bad name for this. What I really want
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* is a way to differentiate between memory ranges that
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* are part of physical devices that constitute
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* a complete removable unit or fru.
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* i.e. do these ranges belong to the same physical device,
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* s.t. if I offline all of these sections I can then
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* remove the physical device?
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*/
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static ssize_t show_phys_device(struct sys_device *dev,
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struct sysdev_attribute *attr, char *buf)
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{
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struct memory_block *mem =
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container_of(dev, struct memory_block, sysdev);
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return sprintf(buf, "%d\n", mem->phys_device);
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}
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static SYSDEV_ATTR(phys_index, 0444, show_mem_start_phys_index, NULL);
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static SYSDEV_ATTR(end_phys_index, 0444, show_mem_end_phys_index, NULL);
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static SYSDEV_ATTR(state, 0644, show_mem_state, store_mem_state);
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static SYSDEV_ATTR(phys_device, 0444, show_phys_device, NULL);
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static SYSDEV_ATTR(removable, 0444, show_mem_removable, NULL);
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#define mem_create_simple_file(mem, attr_name) \
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sysdev_create_file(&mem->sysdev, &attr_##attr_name)
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#define mem_remove_simple_file(mem, attr_name) \
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sysdev_remove_file(&mem->sysdev, &attr_##attr_name)
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/*
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* Block size attribute stuff
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*/
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static ssize_t
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print_block_size(struct sysdev_class *class, struct sysdev_class_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%lx\n", get_memory_block_size());
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}
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static SYSDEV_CLASS_ATTR(block_size_bytes, 0444, print_block_size, NULL);
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static int block_size_init(void)
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{
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return sysfs_create_file(&memory_sysdev_class.kset.kobj,
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&attr_block_size_bytes.attr);
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}
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/*
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* Some architectures will have custom drivers to do this, and
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* will not need to do it from userspace. The fake hot-add code
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* as well as ppc64 will do all of their discovery in userspace
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* and will require this interface.
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*/
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#ifdef CONFIG_ARCH_MEMORY_PROBE
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static ssize_t
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memory_probe_store(struct class *class, struct class_attribute *attr,
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const char *buf, size_t count)
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{
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u64 phys_addr;
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int nid;
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int i, ret;
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phys_addr = simple_strtoull(buf, NULL, 0);
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for (i = 0; i < sections_per_block; i++) {
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nid = memory_add_physaddr_to_nid(phys_addr);
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ret = add_memory(nid, phys_addr,
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PAGES_PER_SECTION << PAGE_SHIFT);
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if (ret)
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break;
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phys_addr += MIN_MEMORY_BLOCK_SIZE;
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}
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if (ret)
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count = ret;
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return count;
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}
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static CLASS_ATTR(probe, S_IWUSR, NULL, memory_probe_store);
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static int memory_probe_init(void)
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{
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return sysfs_create_file(&memory_sysdev_class.kset.kobj,
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&class_attr_probe.attr);
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}
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#else
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static inline int memory_probe_init(void)
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{
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return 0;
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}
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#endif
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#ifdef CONFIG_MEMORY_FAILURE
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/*
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* Support for offlining pages of memory
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*/
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/* Soft offline a page */
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static ssize_t
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store_soft_offline_page(struct class *class,
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struct class_attribute *attr,
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const char *buf, size_t count)
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{
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int ret;
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u64 pfn;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (strict_strtoull(buf, 0, &pfn) < 0)
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return -EINVAL;
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pfn >>= PAGE_SHIFT;
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if (!pfn_valid(pfn))
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return -ENXIO;
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ret = soft_offline_page(pfn_to_page(pfn), 0);
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return ret == 0 ? count : ret;
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}
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/* Forcibly offline a page, including killing processes. */
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static ssize_t
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store_hard_offline_page(struct class *class,
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struct class_attribute *attr,
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const char *buf, size_t count)
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{
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int ret;
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u64 pfn;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (strict_strtoull(buf, 0, &pfn) < 0)
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return -EINVAL;
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pfn >>= PAGE_SHIFT;
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ret = __memory_failure(pfn, 0, 0);
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return ret ? ret : count;
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}
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static CLASS_ATTR(soft_offline_page, 0644, NULL, store_soft_offline_page);
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static CLASS_ATTR(hard_offline_page, 0644, NULL, store_hard_offline_page);
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static __init int memory_fail_init(void)
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{
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int err;
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err = sysfs_create_file(&memory_sysdev_class.kset.kobj,
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&class_attr_soft_offline_page.attr);
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if (!err)
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err = sysfs_create_file(&memory_sysdev_class.kset.kobj,
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&class_attr_hard_offline_page.attr);
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return err;
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}
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#else
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static inline int memory_fail_init(void)
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{
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return 0;
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}
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#endif
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/*
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* Note that phys_device is optional. It is here to allow for
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* differentiation between which *physical* devices each
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* section belongs to...
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*/
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int __weak arch_get_memory_phys_device(unsigned long start_pfn)
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{
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return 0;
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}
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struct memory_block *find_memory_block_hinted(struct mem_section *section,
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struct memory_block *hint)
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{
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struct kobject *kobj;
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struct sys_device *sysdev;
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struct memory_block *mem;
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char name[sizeof(MEMORY_CLASS_NAME) + 9 + 1];
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int block_id = base_memory_block_id(__section_nr(section));
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kobj = hint ? &hint->sysdev.kobj : NULL;
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/*
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* This only works because we know that section == sysdev->id
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* slightly redundant with sysdev_register()
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*/
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sprintf(&name[0], "%s%d", MEMORY_CLASS_NAME, block_id);
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kobj = kset_find_obj_hinted(&memory_sysdev_class.kset, name, kobj);
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if (!kobj)
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return NULL;
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sysdev = container_of(kobj, struct sys_device, kobj);
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mem = container_of(sysdev, struct memory_block, sysdev);
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return mem;
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}
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/*
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* For now, we have a linear search to go find the appropriate
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* memory_block corresponding to a particular phys_index. If
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* this gets to be a real problem, we can always use a radix
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* tree or something here.
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*
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* This could be made generic for all sysdev classes.
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*/
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struct memory_block *find_memory_block(struct mem_section *section)
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{
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return find_memory_block_hinted(section, NULL);
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}
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static int init_memory_block(struct memory_block **memory,
|
|
struct mem_section *section, unsigned long state)
|
|
{
|
|
struct memory_block *mem;
|
|
unsigned long start_pfn;
|
|
int scn_nr;
|
|
int ret = 0;
|
|
|
|
mem = kzalloc(sizeof(*mem), GFP_KERNEL);
|
|
if (!mem)
|
|
return -ENOMEM;
|
|
|
|
scn_nr = __section_nr(section);
|
|
mem->start_section_nr =
|
|
base_memory_block_id(scn_nr) * sections_per_block;
|
|
mem->end_section_nr = mem->start_section_nr + sections_per_block - 1;
|
|
mem->state = state;
|
|
mem->section_count++;
|
|
mutex_init(&mem->state_mutex);
|
|
start_pfn = section_nr_to_pfn(mem->start_section_nr);
|
|
mem->phys_device = arch_get_memory_phys_device(start_pfn);
|
|
|
|
ret = register_memory(mem);
|
|
if (!ret)
|
|
ret = mem_create_simple_file(mem, phys_index);
|
|
if (!ret)
|
|
ret = mem_create_simple_file(mem, end_phys_index);
|
|
if (!ret)
|
|
ret = mem_create_simple_file(mem, state);
|
|
if (!ret)
|
|
ret = mem_create_simple_file(mem, phys_device);
|
|
if (!ret)
|
|
ret = mem_create_simple_file(mem, removable);
|
|
|
|
*memory = mem;
|
|
return ret;
|
|
}
|
|
|
|
static int add_memory_section(int nid, struct mem_section *section,
|
|
unsigned long state, enum mem_add_context context)
|
|
{
|
|
struct memory_block *mem;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&mem_sysfs_mutex);
|
|
|
|
mem = find_memory_block(section);
|
|
if (mem) {
|
|
mem->section_count++;
|
|
kobject_put(&mem->sysdev.kobj);
|
|
} else
|
|
ret = init_memory_block(&mem, section, state);
|
|
|
|
if (!ret) {
|
|
if (context == HOTPLUG &&
|
|
mem->section_count == sections_per_block)
|
|
ret = register_mem_sect_under_node(mem, nid);
|
|
}
|
|
|
|
mutex_unlock(&mem_sysfs_mutex);
|
|
return ret;
|
|
}
|
|
|
|
int remove_memory_block(unsigned long node_id, struct mem_section *section,
|
|
int phys_device)
|
|
{
|
|
struct memory_block *mem;
|
|
|
|
mutex_lock(&mem_sysfs_mutex);
|
|
mem = find_memory_block(section);
|
|
unregister_mem_sect_under_nodes(mem, __section_nr(section));
|
|
|
|
mem->section_count--;
|
|
if (mem->section_count == 0) {
|
|
mem_remove_simple_file(mem, phys_index);
|
|
mem_remove_simple_file(mem, end_phys_index);
|
|
mem_remove_simple_file(mem, state);
|
|
mem_remove_simple_file(mem, phys_device);
|
|
mem_remove_simple_file(mem, removable);
|
|
unregister_memory(mem);
|
|
kfree(mem);
|
|
} else
|
|
kobject_put(&mem->sysdev.kobj);
|
|
|
|
mutex_unlock(&mem_sysfs_mutex);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* need an interface for the VM to add new memory regions,
|
|
* but without onlining it.
|
|
*/
|
|
int register_new_memory(int nid, struct mem_section *section)
|
|
{
|
|
return add_memory_section(nid, section, MEM_OFFLINE, HOTPLUG);
|
|
}
|
|
|
|
int unregister_memory_section(struct mem_section *section)
|
|
{
|
|
if (!present_section(section))
|
|
return -EINVAL;
|
|
|
|
return remove_memory_block(0, section, 0);
|
|
}
|
|
|
|
/*
|
|
* Initialize the sysfs support for memory devices...
|
|
*/
|
|
int __init memory_dev_init(void)
|
|
{
|
|
unsigned int i;
|
|
int ret;
|
|
int err;
|
|
unsigned long block_sz;
|
|
|
|
memory_sysdev_class.kset.uevent_ops = &memory_uevent_ops;
|
|
ret = sysdev_class_register(&memory_sysdev_class);
|
|
if (ret)
|
|
goto out;
|
|
|
|
block_sz = get_memory_block_size();
|
|
sections_per_block = block_sz / MIN_MEMORY_BLOCK_SIZE;
|
|
|
|
/*
|
|
* Create entries for memory sections that were found
|
|
* during boot and have been initialized
|
|
*/
|
|
for (i = 0; i < NR_MEM_SECTIONS; i++) {
|
|
if (!present_section_nr(i))
|
|
continue;
|
|
err = add_memory_section(0, __nr_to_section(i), MEM_ONLINE,
|
|
BOOT);
|
|
if (!ret)
|
|
ret = err;
|
|
}
|
|
|
|
err = memory_probe_init();
|
|
if (!ret)
|
|
ret = err;
|
|
err = memory_fail_init();
|
|
if (!ret)
|
|
ret = err;
|
|
err = block_size_init();
|
|
if (!ret)
|
|
ret = err;
|
|
out:
|
|
if (ret)
|
|
printk(KERN_ERR "%s() failed: %d\n", __func__, ret);
|
|
return ret;
|
|
}
|