[PATCH] memory hotplug: sysfs and add/remove functions
This adds generic memory add/remove and supporting functions for memory hotplug into a new file as well as a memory hotplug kernel config option. Individual architecture patches will follow. For now, disable memory hotplug when swsusp is enabled. There's a lot of churn there right now. We'll fix it up properly once it calms down. Signed-off-by: Matt Tolentino <matthew.e.tolentino@intel.com> Signed-off-by: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Dave Hansen
Linus Torvalds
Родитель
bdc8cb9845
Коммит
3947be1969
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@ -7,6 +7,7 @@ obj-y := core.o sys.o bus.o dd.o \
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obj-y += power/
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obj-$(CONFIG_FW_LOADER) += firmware_class.o
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obj-$(CONFIG_NUMA) += node.o
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obj-$(CONFIG_MEMORY_HOTPLUG) += memory.o
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ifeq ($(CONFIG_DEBUG_DRIVER),y)
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EXTRA_CFLAGS += -DDEBUG
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@ -9,6 +9,7 @@
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/memory.h>
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#include "base.h"
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@ -33,5 +34,6 @@ void __init driver_init(void)
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platform_bus_init();
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system_bus_init();
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cpu_dev_init();
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memory_dev_init();
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attribute_container_init();
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}
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@ -0,0 +1,455 @@
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/*
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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/sched.h> /* capable() */
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#include <linux/topology.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 <asm/atomic.h>
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#include <asm/uaccess.h>
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#define MEMORY_CLASS_NAME "memory"
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static struct sysdev_class memory_sysdev_class = {
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set_kset_name(MEMORY_CLASS_NAME),
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};
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EXPORT_SYMBOL(memory_sysdev_class);
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static char *memory_hotplug_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_hotplug(struct kset *kset, struct kobject *kobj, char **envp,
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int num_envp, char *buffer, int buffer_size)
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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 struct kset_hotplug_ops memory_hotplug_ops = {
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.name = memory_hotplug_name,
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.hotplug = memory_hotplug,
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};
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static struct notifier_block *memory_chain;
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static int register_memory_notifier(struct notifier_block *nb)
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{
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return notifier_chain_register(&memory_chain, nb);
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}
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static void unregister_memory_notifier(struct notifier_block *nb)
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{
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notifier_chain_unregister(&memory_chain, nb);
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}
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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 int
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register_memory(struct memory_block *memory, struct mem_section *section,
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struct node *root)
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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 = __section_nr(section);
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error = sysdev_register(&memory->sysdev);
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if (root && !error)
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error = sysfs_create_link(&root->sysdev.kobj,
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&memory->sysdev.kobj,
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kobject_name(&memory->sysdev.kobj));
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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, struct mem_section *section,
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struct node *root)
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{
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BUG_ON(memory->sysdev.cls != &memory_sysdev_class);
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BUG_ON(memory->sysdev.id != __section_nr(section));
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sysdev_unregister(&memory->sysdev);
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if (root)
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sysfs_remove_link(&root->sysdev.kobj,
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kobject_name(&memory->sysdev.kobj));
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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_phys_index(struct sys_device *dev, 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, "%08lx\n", mem->phys_index);
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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, 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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static inline int memory_notify(unsigned long val, void *v)
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{
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return notifier_call_chain(&memory_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(struct memory_block *mem, unsigned long action)
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{
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int i;
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unsigned long psection;
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unsigned long start_pfn, start_paddr;
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struct page *first_page;
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int ret;
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int old_state = mem->state;
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psection = mem->phys_index;
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first_page = pfn_to_page(psection << 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 < PAGES_PER_SECTION; 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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psection, 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, PAGES_PER_SECTION);
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break;
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case MEM_OFFLINE:
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mem->state = MEM_GOING_OFFLINE;
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memory_notify(MEM_GOING_OFFLINE, NULL);
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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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PAGES_PER_SECTION << PAGE_SHIFT);
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if (ret) {
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mem->state = old_state;
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break;
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}
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memory_notify(MEM_MAPPING_INVALID, NULL);
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break;
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default:
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printk(KERN_WARNING "%s(%p, %ld) unknown action: %ld\n",
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__FUNCTION__, mem, action, action);
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WARN_ON(1);
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ret = -EINVAL;
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}
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/*
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* For now, only notify on successful memory operations
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*/
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if (!ret)
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memory_notify(action, NULL);
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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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down(&mem->state_sem);
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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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ret = memory_block_action(mem, to_state);
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if (!ret)
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mem->state = to_state;
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out:
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up(&mem->state_sem);
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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, const char *buf, size_t count)
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{
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struct memory_block *mem;
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unsigned int phys_section_nr;
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int ret = -EINVAL;
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mem = container_of(dev, struct memory_block, sysdev);
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phys_section_nr = mem->phys_index;
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if (!valid_section_nr(phys_section_nr))
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goto out;
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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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out:
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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, 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_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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#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 class *class, char *buf)
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{
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return sprintf(buf, "%lx\n", (unsigned long)PAGES_PER_SECTION * PAGE_SIZE);
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}
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static 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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sysfs_create_file(&memory_sysdev_class.kset.kobj,
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&class_attr_block_size_bytes.attr);
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return 0;
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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, const char __user *buf, size_t count)
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{
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u64 phys_addr;
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int ret;
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phys_addr = simple_strtoull(buf, NULL, 0);
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ret = add_memory(phys_addr, PAGES_PER_SECTION << PAGE_SHIFT);
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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, 0700, NULL, memory_probe_store);
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static int memory_probe_init(void)
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{
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sysfs_create_file(&memory_sysdev_class.kset.kobj,
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&class_attr_probe.attr);
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return 0;
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}
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#else
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#define memory_probe_init(...) do {} while (0)
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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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static int add_memory_block(unsigned long node_id, struct mem_section *section,
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unsigned long state, int phys_device)
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{
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size_t size = sizeof(struct memory_block);
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struct memory_block *mem = kmalloc(size, GFP_KERNEL);
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int ret = 0;
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if (!mem)
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return -ENOMEM;
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memset(mem, 0, size);
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mem->phys_index = __section_nr(section);
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mem->state = state;
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init_MUTEX(&mem->state_sem);
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mem->phys_device = phys_device;
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ret = register_memory(mem, section, NULL);
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if (!ret)
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ret = mem_create_simple_file(mem, phys_index);
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if (!ret)
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ret = mem_create_simple_file(mem, state);
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if (!ret)
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ret = mem_create_simple_file(mem, phys_device);
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return ret;
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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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static struct memory_block *find_memory_block(struct mem_section *section)
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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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/*
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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, __section_nr(section));
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kobj = kset_find_obj(&memory_sysdev_class.kset, name);
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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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int remove_memory_block(unsigned long node_id, struct mem_section *section,
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int phys_device)
|
||||
{
|
||||
struct memory_block *mem;
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||||
|
||||
mem = find_memory_block(section);
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mem_remove_simple_file(mem, phys_index);
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mem_remove_simple_file(mem, state);
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mem_remove_simple_file(mem, phys_device);
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unregister_memory(mem, section, NULL);
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return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* need an interface for the VM to add new memory regions,
|
||||
* but without onlining it.
|
||||
*/
|
||||
int register_new_memory(struct mem_section *section)
|
||||
{
|
||||
return add_memory_block(0, section, MEM_OFFLINE, 0);
|
||||
}
|
||||
|
||||
int unregister_memory_section(struct mem_section *section)
|
||||
{
|
||||
if (!valid_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;
|
||||
|
||||
memory_sysdev_class.kset.hotplug_ops = &memory_hotplug_ops;
|
||||
ret = sysdev_class_register(&memory_sysdev_class);
|
||||
|
||||
/*
|
||||
* Create entries for memory sections that were found
|
||||
* during boot and have been initialized
|
||||
*/
|
||||
for (i = 0; i < NR_MEM_SECTIONS; i++) {
|
||||
if (!valid_section_nr(i))
|
||||
continue;
|
||||
add_memory_block(0, __nr_to_section(i), MEM_ONLINE, 0);
|
||||
}
|
||||
|
||||
memory_probe_init();
|
||||
block_size_init();
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
|
@ -0,0 +1,94 @@
|
|||
/*
|
||||
* include/linux/memory.h - generic memory definition
|
||||
*
|
||||
* This is mainly for topological representation. We define the
|
||||
* basic "struct memory_block" here, which can be embedded in per-arch
|
||||
* definitions or NUMA information.
|
||||
*
|
||||
* Basic handling of the devices is done in drivers/base/memory.c
|
||||
* and system devices are handled in drivers/base/sys.c.
|
||||
*
|
||||
* Memory block are exported via sysfs in the class/memory/devices/
|
||||
* directory.
|
||||
*
|
||||
*/
|
||||
#ifndef _LINUX_MEMORY_H_
|
||||
#define _LINUX_MEMORY_H_
|
||||
|
||||
#include <linux/sysdev.h>
|
||||
#include <linux/node.h>
|
||||
#include <linux/compiler.h>
|
||||
|
||||
#include <asm/semaphore.h>
|
||||
|
||||
struct memory_block {
|
||||
unsigned long phys_index;
|
||||
unsigned long state;
|
||||
/*
|
||||
* This serializes all state change requests. It isn't
|
||||
* held during creation because the control files are
|
||||
* created long after the critical areas during
|
||||
* initialization.
|
||||
*/
|
||||
struct semaphore state_sem;
|
||||
int phys_device; /* to which fru does this belong? */
|
||||
void *hw; /* optional pointer to fw/hw data */
|
||||
int (*phys_callback)(struct memory_block *);
|
||||
struct sys_device sysdev;
|
||||
};
|
||||
|
||||
/* These states are exposed to userspace as text strings in sysfs */
|
||||
#define MEM_ONLINE (1<<0) /* exposed to userspace */
|
||||
#define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */
|
||||
#define MEM_OFFLINE (1<<2) /* exposed to userspace */
|
||||
|
||||
/*
|
||||
* All of these states are currently kernel-internal for notifying
|
||||
* kernel components and architectures.
|
||||
*
|
||||
* For MEM_MAPPING_INVALID, all notifier chains with priority >0
|
||||
* are called before pfn_to_page() becomes invalid. The priority=0
|
||||
* entry is reserved for the function that actually makes
|
||||
* pfn_to_page() stop working. Any notifiers that want to be called
|
||||
* after that should have priority <0.
|
||||
*/
|
||||
#define MEM_MAPPING_INVALID (1<<3)
|
||||
|
||||
#ifndef CONFIG_MEMORY_HOTPLUG
|
||||
static inline int memory_dev_init(void)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
static inline int register_memory_notifier(struct notifier_block *nb)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
static inline void unregister_memory_notifier(struct notifier_block *nb)
|
||||
{
|
||||
}
|
||||
#else
|
||||
extern int register_memory(struct memory_block *, struct mem_section *section, struct node *);
|
||||
extern int register_new_memory(struct mem_section *);
|
||||
extern int unregister_memory_section(struct mem_section *);
|
||||
extern int memory_dev_init(void);
|
||||
extern int register_memory_notifier(struct notifier_block *nb);
|
||||
extern void unregister_memory_notifier(struct notifier_block *nb);
|
||||
|
||||
#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
|
||||
|
||||
extern int invalidate_phys_mapping(unsigned long, unsigned long);
|
||||
struct notifier_block;
|
||||
|
||||
extern int register_memory_notifier(struct notifier_block *nb);
|
||||
extern void unregister_memory_notifier(struct notifier_block *nb);
|
||||
|
||||
extern struct sysdev_class memory_sysdev_class;
|
||||
#endif /* CONFIG_MEMORY_HOTPLUG */
|
||||
|
||||
#define hotplug_memory_notifier(fn, pri) { \
|
||||
static struct notifier_block fn##_mem_nb = \
|
||||
{ .notifier_call = fn, .priority = pri }; \
|
||||
register_memory_notifier(&fn##_mem_nb); \
|
||||
}
|
||||
|
||||
#endif /* _LINUX_MEMORY_H_ */
|
||||
|
|
@ -3,6 +3,8 @@
|
|||
|
||||
#include <linux/mmzone.h>
|
||||
#include <linux/spinlock.h>
|
||||
#include <linux/mmzone.h>
|
||||
#include <linux/notifier.h>
|
||||
|
||||
#ifdef CONFIG_MEMORY_HOTPLUG
|
||||
/*
|
||||
|
|
@ -46,6 +48,19 @@ static inline void zone_seqlock_init(struct zone *zone)
|
|||
{
|
||||
seqlock_init(&zone->span_seqlock);
|
||||
}
|
||||
extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
|
||||
extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
|
||||
extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
|
||||
/* need some defines for these for archs that don't support it */
|
||||
extern void online_page(struct page *page);
|
||||
/* VM interface that may be used by firmware interface */
|
||||
extern int add_memory(u64 start, u64 size);
|
||||
extern int remove_memory(u64 start, u64 size);
|
||||
extern int online_pages(unsigned long, unsigned long);
|
||||
|
||||
/* reasonably generic interface to expand the physical pages in a zone */
|
||||
extern int __add_pages(struct zone *zone, unsigned long start_pfn,
|
||||
unsigned long nr_pages);
|
||||
#else /* ! CONFIG_MEMORY_HOTPLUG */
|
||||
/*
|
||||
* Stub functions for when hotplug is off
|
||||
|
|
@ -65,5 +80,25 @@ static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
|
|||
static inline void zone_span_writelock(struct zone *zone) {}
|
||||
static inline void zone_span_writeunlock(struct zone *zone) {}
|
||||
static inline void zone_seqlock_init(struct zone *zone) {}
|
||||
|
||||
static inline int mhp_notimplemented(const char *func)
|
||||
{
|
||||
printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
|
||||
dump_stack();
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
static inline int __add_pages(struct zone *zone, unsigned long start_pfn,
|
||||
unsigned long nr_pages)
|
||||
{
|
||||
return mhp_notimplemented(__FUNCTION__);
|
||||
}
|
||||
#endif /* ! CONFIG_MEMORY_HOTPLUG */
|
||||
static inline int __remove_pages(struct zone *zone, unsigned long start_pfn,
|
||||
unsigned long nr_pages)
|
||||
{
|
||||
printk(KERN_WARNING "%s() called, not yet supported\n", __FUNCTION__);
|
||||
dump_stack();
|
||||
return -ENOSYS;
|
||||
}
|
||||
#endif /* __LINUX_MEMORY_HOTPLUG_H */
|
||||
|
|
|
|||
|
|
@ -840,6 +840,7 @@ extern void free_area_init_node(int nid, pg_data_t *pgdat,
|
|||
unsigned long * zones_size, unsigned long zone_start_pfn,
|
||||
unsigned long *zholes_size);
|
||||
extern void memmap_init_zone(unsigned long, int, unsigned long, unsigned long);
|
||||
extern void setup_per_zone_pages_min(void);
|
||||
extern void mem_init(void);
|
||||
extern void show_mem(void);
|
||||
extern void si_meminfo(struct sysinfo * val);
|
||||
|
|
|
|||
|
|
@ -112,6 +112,14 @@ config SPARSEMEM_EXTREME
|
|||
def_bool y
|
||||
depends on SPARSEMEM && !SPARSEMEM_STATIC
|
||||
|
||||
# eventually, we can have this option just 'select SPARSEMEM'
|
||||
config MEMORY_HOTPLUG
|
||||
bool "Allow for memory hot-add"
|
||||
depends on SPARSEMEM && HOTPLUG && !SOFTWARE_SUSPEND
|
||||
|
||||
comment "Memory hotplug is currently incompatible with Software Suspend"
|
||||
depends on SPARSEMEM && HOTPLUG && SOFTWARE_SUSPEND
|
||||
|
||||
# Heavily threaded applications may benefit from splitting the mm-wide
|
||||
# page_table_lock, so that faults on different parts of the user address
|
||||
# space can be handled with less contention: split it at this NR_CPUS.
|
||||
|
|
|
|||
|
|
@ -18,5 +18,5 @@ obj-$(CONFIG_NUMA) += mempolicy.o
|
|||
obj-$(CONFIG_SPARSEMEM) += sparse.o
|
||||
obj-$(CONFIG_SHMEM) += shmem.o
|
||||
obj-$(CONFIG_TINY_SHMEM) += tiny-shmem.o
|
||||
|
||||
obj-$(CONFIG_MEMORY_HOTPLUG) += memory_hotplug.o
|
||||
obj-$(CONFIG_FS_XIP) += filemap_xip.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,178 @@
|
|||
/*
|
||||
* linux/mm/memory_hotplug.c
|
||||
*
|
||||
* Copyright (C)
|
||||
*/
|
||||
|
||||
#include <linux/config.h>
|
||||
#include <linux/stddef.h>
|
||||
#include <linux/mm.h>
|
||||
#include <linux/swap.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/pagemap.h>
|
||||
#include <linux/bootmem.h>
|
||||
#include <linux/compiler.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/pagevec.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/sysctl.h>
|
||||
#include <linux/cpu.h>
|
||||
#include <linux/memory.h>
|
||||
#include <linux/memory_hotplug.h>
|
||||
#include <linux/highmem.h>
|
||||
#include <linux/vmalloc.h>
|
||||
|
||||
#include <asm/tlbflush.h>
|
||||
|
||||
static struct page *__kmalloc_section_memmap(unsigned long nr_pages)
|
||||
{
|
||||
struct page *page, *ret;
|
||||
unsigned long memmap_size = sizeof(struct page) * nr_pages;
|
||||
|
||||
page = alloc_pages(GFP_KERNEL, get_order(memmap_size));
|
||||
if (page)
|
||||
goto got_map_page;
|
||||
|
||||
ret = vmalloc(memmap_size);
|
||||
if (ret)
|
||||
goto got_map_ptr;
|
||||
|
||||
return NULL;
|
||||
got_map_page:
|
||||
ret = (struct page *)pfn_to_kaddr(page_to_pfn(page));
|
||||
got_map_ptr:
|
||||
memset(ret, 0, memmap_size);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
extern void zonetable_add(struct zone *zone, int nid, int zid, unsigned long pfn,
|
||||
unsigned long size);
|
||||
static void __add_zone(struct zone *zone, unsigned long phys_start_pfn)
|
||||
{
|
||||
struct pglist_data *pgdat = zone->zone_pgdat;
|
||||
int nr_pages = PAGES_PER_SECTION;
|
||||
int nid = pgdat->node_id;
|
||||
int zone_type;
|
||||
|
||||
zone_type = zone - pgdat->node_zones;
|
||||
memmap_init_zone(nr_pages, nid, zone_type, phys_start_pfn);
|
||||
zonetable_add(zone, nid, zone_type, phys_start_pfn, nr_pages);
|
||||
}
|
||||
|
||||
extern int sparse_add_one_section(struct zone *, unsigned long,
|
||||
struct page *mem_map);
|
||||
static int __add_section(struct zone *zone, unsigned long phys_start_pfn)
|
||||
{
|
||||
struct pglist_data *pgdat = zone->zone_pgdat;
|
||||
int nr_pages = PAGES_PER_SECTION;
|
||||
struct page *memmap;
|
||||
int ret;
|
||||
|
||||
/*
|
||||
* This can potentially allocate memory, and does its own
|
||||
* internal locking.
|
||||
*/
|
||||
sparse_index_init(pfn_to_section_nr(phys_start_pfn), pgdat->node_id);
|
||||
|
||||
pgdat_resize_lock(pgdat, &flags);
|
||||
memmap = __kmalloc_section_memmap(nr_pages);
|
||||
ret = sparse_add_one_section(zone, phys_start_pfn, memmap);
|
||||
pgdat_resize_unlock(pgdat, &flags);
|
||||
|
||||
if (ret <= 0) {
|
||||
/* the mem_map didn't get used */
|
||||
if (memmap >= (struct page *)VMALLOC_START &&
|
||||
memmap < (struct page *)VMALLOC_END)
|
||||
vfree(memmap);
|
||||
else
|
||||
free_pages((unsigned long)memmap,
|
||||
get_order(sizeof(struct page) * nr_pages));
|
||||
}
|
||||
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
__add_zone(zone, phys_start_pfn);
|
||||
return register_new_memory(__pfn_to_section(phys_start_pfn));
|
||||
}
|
||||
|
||||
/*
|
||||
* Reasonably generic function for adding memory. It is
|
||||
* expected that archs that support memory hotplug will
|
||||
* call this function after deciding the zone to which to
|
||||
* add the new pages.
|
||||
*/
|
||||
int __add_pages(struct zone *zone, unsigned long phys_start_pfn,
|
||||
unsigned long nr_pages)
|
||||
{
|
||||
unsigned long i;
|
||||
int err = 0;
|
||||
|
||||
for (i = 0; i < nr_pages; i += PAGES_PER_SECTION) {
|
||||
err = __add_section(zone, phys_start_pfn + i);
|
||||
|
||||
if (err)
|
||||
break;
|
||||
}
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static void grow_zone_span(struct zone *zone,
|
||||
unsigned long start_pfn, unsigned long end_pfn)
|
||||
{
|
||||
unsigned long old_zone_end_pfn;
|
||||
|
||||
zone_span_writelock(zone);
|
||||
|
||||
old_zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages;
|
||||
if (start_pfn < zone->zone_start_pfn)
|
||||
zone->zone_start_pfn = start_pfn;
|
||||
|
||||
if (end_pfn > old_zone_end_pfn)
|
||||
zone->spanned_pages = end_pfn - zone->zone_start_pfn;
|
||||
|
||||
zone_span_writeunlock(zone);
|
||||
}
|
||||
|
||||
static void grow_pgdat_span(struct pglist_data *pgdat,
|
||||
unsigned long start_pfn, unsigned long end_pfn)
|
||||
{
|
||||
unsigned long old_pgdat_end_pfn =
|
||||
pgdat->node_start_pfn + pgdat->node_spanned_pages;
|
||||
|
||||
if (start_pfn < pgdat->node_start_pfn)
|
||||
pgdat->node_start_pfn = start_pfn;
|
||||
|
||||
if (end_pfn > old_pgdat_end_pfn)
|
||||
pgdat->node_spanned_pages = end_pfn - pgdat->node_spanned_pages;
|
||||
}
|
||||
|
||||
int online_pages(unsigned long pfn, unsigned long nr_pages)
|
||||
{
|
||||
unsigned long i;
|
||||
unsigned long flags;
|
||||
unsigned long onlined_pages = 0;
|
||||
struct zone *zone;
|
||||
|
||||
/*
|
||||
* This doesn't need a lock to do pfn_to_page().
|
||||
* The section can't be removed here because of the
|
||||
* memory_block->state_sem.
|
||||
*/
|
||||
zone = page_zone(pfn_to_page(pfn));
|
||||
pgdat_resize_lock(zone->zone_pgdat, &flags);
|
||||
grow_zone_span(zone, pfn, pfn + nr_pages);
|
||||
grow_pgdat_span(zone->zone_pgdat, pfn, pfn + nr_pages);
|
||||
pgdat_resize_unlock(zone->zone_pgdat, &flags);
|
||||
|
||||
for (i = 0; i < nr_pages; i++) {
|
||||
struct page *page = pfn_to_page(pfn + i);
|
||||
online_page(page);
|
||||
onlined_pages++;
|
||||
}
|
||||
zone->present_pages += onlined_pages;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -1686,7 +1686,7 @@ static void __init calculate_zone_totalpages(struct pglist_data *pgdat,
|
|||
* up by free_all_bootmem() once the early boot process is
|
||||
* done. Non-atomic initialization, single-pass.
|
||||
*/
|
||||
void __init memmap_init_zone(unsigned long size, int nid, unsigned long zone,
|
||||
void __devinit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
|
||||
unsigned long start_pfn)
|
||||
{
|
||||
struct page *page;
|
||||
|
|
@ -2407,7 +2407,7 @@ static void setup_per_zone_lowmem_reserve(void)
|
|||
* that the pages_{min,low,high} values for each zone are set correctly
|
||||
* with respect to min_free_kbytes.
|
||||
*/
|
||||
static void setup_per_zone_pages_min(void)
|
||||
void setup_per_zone_pages_min(void)
|
||||
{
|
||||
unsigned long pages_min = min_free_kbytes >> (PAGE_SHIFT - 10);
|
||||
unsigned long lowmem_pages = 0;
|
||||
|
|
|
|||
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