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![Gavin Shan](/assets/img/avatar_default.png)
According to 'admin-guide/mm/memory-hotplug.rst', the memory block ID, instead of the section index, is shown by '/sys/devices/system/memory/ memoryX/phys_index'. Fix the comments to match with 'admin-guide/mm/memory-hotplug.rst'. Besides, use the existing helper memory_block_id() to convert the section index to the memory block index. No functional change intended. Signed-off-by: Gavin Shan <gshan@redhat.com> Link: https://lore.kernel.org/r/20230120055727.355483-2-gshan@redhat.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1199 lines
31 KiB
C
1199 lines
31 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Memory subsystem 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/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/memory_hotplug.h>
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#include <linux/mm.h>
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#include <linux/stat.h>
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#include <linux/slab.h>
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#include <linux/xarray.h>
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#include <linux/atomic.h>
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#include <linux/uaccess.h>
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#define MEMORY_CLASS_NAME "memory"
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static const char *const online_type_to_str[] = {
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[MMOP_OFFLINE] = "offline",
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[MMOP_ONLINE] = "online",
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[MMOP_ONLINE_KERNEL] = "online_kernel",
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[MMOP_ONLINE_MOVABLE] = "online_movable",
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};
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int mhp_online_type_from_str(const char *str)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(online_type_to_str); i++) {
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if (sysfs_streq(str, online_type_to_str[i]))
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return i;
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}
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return -EINVAL;
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}
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#define to_memory_block(dev) container_of(dev, struct memory_block, dev)
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static int sections_per_block;
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static inline unsigned long memory_block_id(unsigned long 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 inline unsigned long pfn_to_block_id(unsigned long pfn)
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{
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return memory_block_id(pfn_to_section_nr(pfn));
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}
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static inline unsigned long phys_to_block_id(unsigned long phys)
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{
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return pfn_to_block_id(PFN_DOWN(phys));
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}
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static int memory_subsys_online(struct device *dev);
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static int memory_subsys_offline(struct device *dev);
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static struct bus_type memory_subsys = {
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.name = MEMORY_CLASS_NAME,
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.dev_name = MEMORY_CLASS_NAME,
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.online = memory_subsys_online,
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.offline = memory_subsys_offline,
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};
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/*
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* Memory blocks are cached in a local radix tree to avoid
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* a costly linear search for the corresponding device on
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* the subsystem bus.
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*/
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static DEFINE_XARRAY(memory_blocks);
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/*
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* Memory groups, indexed by memory group id (mgid).
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*/
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static DEFINE_XARRAY_FLAGS(memory_groups, XA_FLAGS_ALLOC);
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#define MEMORY_GROUP_MARK_DYNAMIC XA_MARK_1
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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 void memory_block_release(struct device *dev)
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{
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struct memory_block *mem = to_memory_block(dev);
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kfree(mem);
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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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EXPORT_SYMBOL_GPL(memory_block_size_bytes);
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/* Show the memory block ID, relative to the memory block size */
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static ssize_t phys_index_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct memory_block *mem = to_memory_block(dev);
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return sysfs_emit(buf, "%08lx\n", memory_block_id(mem->start_section_nr));
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}
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/*
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* Legacy interface that we cannot remove. Always indicate "removable"
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* with CONFIG_MEMORY_HOTREMOVE - bad heuristic.
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*/
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static ssize_t removable_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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return sysfs_emit(buf, "%d\n", (int)IS_ENABLED(CONFIG_MEMORY_HOTREMOVE));
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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 state_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct memory_block *mem = to_memory_block(dev);
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const char *output;
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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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output = "online";
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break;
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case MEM_OFFLINE:
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output = "offline";
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break;
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case MEM_GOING_OFFLINE:
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output = "going-offline";
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break;
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default:
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WARN_ON(1);
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return sysfs_emit(buf, "ERROR-UNKNOWN-%ld\n", mem->state);
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}
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return sysfs_emit(buf, "%s\n", output);
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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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#if defined(CONFIG_MEMORY_FAILURE) && defined(CONFIG_MEMORY_HOTPLUG)
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static unsigned long memblk_nr_poison(struct memory_block *mem);
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#else
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static inline unsigned long memblk_nr_poison(struct memory_block *mem)
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{
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return 0;
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}
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#endif
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static int memory_block_online(struct memory_block *mem)
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{
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unsigned long start_pfn = section_nr_to_pfn(mem->start_section_nr);
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unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block;
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unsigned long nr_vmemmap_pages = mem->nr_vmemmap_pages;
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struct zone *zone;
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int ret;
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if (memblk_nr_poison(mem))
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return -EHWPOISON;
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zone = zone_for_pfn_range(mem->online_type, mem->nid, mem->group,
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start_pfn, nr_pages);
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/*
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* Although vmemmap pages have a different lifecycle than the pages
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* they describe (they remain until the memory is unplugged), doing
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* their initialization and accounting at memory onlining/offlining
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* stage helps to keep accounting easier to follow - e.g vmemmaps
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* belong to the same zone as the memory they backed.
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*/
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if (nr_vmemmap_pages) {
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ret = mhp_init_memmap_on_memory(start_pfn, nr_vmemmap_pages, zone);
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if (ret)
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return ret;
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}
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ret = online_pages(start_pfn + nr_vmemmap_pages,
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nr_pages - nr_vmemmap_pages, zone, mem->group);
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if (ret) {
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if (nr_vmemmap_pages)
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mhp_deinit_memmap_on_memory(start_pfn, nr_vmemmap_pages);
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return ret;
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}
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/*
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* Account once onlining succeeded. If the zone was unpopulated, it is
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* now already properly populated.
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*/
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if (nr_vmemmap_pages)
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adjust_present_page_count(pfn_to_page(start_pfn), mem->group,
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nr_vmemmap_pages);
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mem->zone = zone;
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return ret;
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}
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static int memory_block_offline(struct memory_block *mem)
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{
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unsigned long start_pfn = section_nr_to_pfn(mem->start_section_nr);
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unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block;
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unsigned long nr_vmemmap_pages = mem->nr_vmemmap_pages;
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int ret;
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if (!mem->zone)
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return -EINVAL;
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/*
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* Unaccount before offlining, such that unpopulated zone and kthreads
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* can properly be torn down in offline_pages().
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*/
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if (nr_vmemmap_pages)
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adjust_present_page_count(pfn_to_page(start_pfn), mem->group,
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-nr_vmemmap_pages);
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ret = offline_pages(start_pfn + nr_vmemmap_pages,
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nr_pages - nr_vmemmap_pages, mem->zone, mem->group);
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if (ret) {
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/* offline_pages() failed. Account back. */
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if (nr_vmemmap_pages)
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adjust_present_page_count(pfn_to_page(start_pfn),
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mem->group, nr_vmemmap_pages);
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return ret;
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}
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if (nr_vmemmap_pages)
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mhp_deinit_memmap_on_memory(start_pfn, nr_vmemmap_pages);
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mem->zone = NULL;
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return ret;
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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 ret;
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switch (action) {
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case MEM_ONLINE:
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ret = memory_block_online(mem);
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break;
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case MEM_OFFLINE:
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ret = memory_block_offline(mem);
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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__, mem->start_section_nr, 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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if (mem->state != from_state_req)
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return -EINVAL;
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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, to_state);
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mem->state = ret ? from_state_req : to_state;
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return ret;
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}
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/* The device lock serializes operations on memory_subsys_[online|offline] */
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static int memory_subsys_online(struct device *dev)
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{
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struct memory_block *mem = to_memory_block(dev);
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int ret;
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if (mem->state == MEM_ONLINE)
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return 0;
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/*
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* When called via device_online() without configuring the online_type,
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* we want to default to MMOP_ONLINE.
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*/
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if (mem->online_type == MMOP_OFFLINE)
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mem->online_type = MMOP_ONLINE;
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ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE);
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mem->online_type = MMOP_OFFLINE;
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return ret;
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}
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static int memory_subsys_offline(struct device *dev)
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{
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struct memory_block *mem = to_memory_block(dev);
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if (mem->state == MEM_OFFLINE)
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return 0;
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return memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE);
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}
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static ssize_t state_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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const int online_type = mhp_online_type_from_str(buf);
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struct memory_block *mem = to_memory_block(dev);
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int ret;
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if (online_type < 0)
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return -EINVAL;
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ret = lock_device_hotplug_sysfs();
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if (ret)
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return ret;
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switch (online_type) {
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case MMOP_ONLINE_KERNEL:
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case MMOP_ONLINE_MOVABLE:
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case MMOP_ONLINE:
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/* mem->online_type is protected by device_hotplug_lock */
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mem->online_type = online_type;
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ret = device_online(&mem->dev);
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break;
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case MMOP_OFFLINE:
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ret = device_offline(&mem->dev);
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break;
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default:
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ret = -EINVAL; /* should never happen */
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}
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unlock_device_hotplug();
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if (ret < 0)
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return ret;
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if (ret)
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return -EINVAL;
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return count;
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}
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/*
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* Legacy interface that we cannot remove: s390x exposes the storage increment
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* covered by a memory block, allowing for identifying which memory blocks
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* comprise a storage increment. Since a memory block spans complete
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* storage increments nowadays, this interface is basically unused. Other
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* archs never exposed != 0.
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*/
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static ssize_t phys_device_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct memory_block *mem = to_memory_block(dev);
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unsigned long start_pfn = section_nr_to_pfn(mem->start_section_nr);
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return sysfs_emit(buf, "%d\n",
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arch_get_memory_phys_device(start_pfn));
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}
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#ifdef CONFIG_MEMORY_HOTREMOVE
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static int print_allowed_zone(char *buf, int len, int nid,
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struct memory_group *group,
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unsigned long start_pfn, unsigned long nr_pages,
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int online_type, struct zone *default_zone)
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{
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struct zone *zone;
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zone = zone_for_pfn_range(online_type, nid, group, start_pfn, nr_pages);
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if (zone == default_zone)
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return 0;
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return sysfs_emit_at(buf, len, " %s", zone->name);
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}
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static ssize_t valid_zones_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct memory_block *mem = to_memory_block(dev);
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unsigned long start_pfn = section_nr_to_pfn(mem->start_section_nr);
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unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block;
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struct memory_group *group = mem->group;
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struct zone *default_zone;
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int nid = mem->nid;
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int len = 0;
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/*
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* Check the existing zone. Make sure that we do that only on the
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* online nodes otherwise the page_zone is not reliable
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*/
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if (mem->state == MEM_ONLINE) {
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/*
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* If !mem->zone, the memory block spans multiple zones and
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* cannot get offlined.
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*/
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default_zone = mem->zone;
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if (!default_zone)
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return sysfs_emit(buf, "%s\n", "none");
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len += sysfs_emit_at(buf, len, "%s", default_zone->name);
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goto out;
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}
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default_zone = zone_for_pfn_range(MMOP_ONLINE, nid, group,
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start_pfn, nr_pages);
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len += sysfs_emit_at(buf, len, "%s", default_zone->name);
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len += print_allowed_zone(buf, len, nid, group, start_pfn, nr_pages,
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MMOP_ONLINE_KERNEL, default_zone);
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len += print_allowed_zone(buf, len, nid, group, start_pfn, nr_pages,
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MMOP_ONLINE_MOVABLE, default_zone);
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out:
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len += sysfs_emit_at(buf, len, "\n");
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return len;
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}
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static DEVICE_ATTR_RO(valid_zones);
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#endif
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static DEVICE_ATTR_RO(phys_index);
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static DEVICE_ATTR_RW(state);
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static DEVICE_ATTR_RO(phys_device);
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static DEVICE_ATTR_RO(removable);
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/*
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* Show the memory block size (shared by all memory blocks).
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*/
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static ssize_t block_size_bytes_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sysfs_emit(buf, "%lx\n", memory_block_size_bytes());
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}
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static DEVICE_ATTR_RO(block_size_bytes);
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/*
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* Memory auto online policy.
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*/
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static ssize_t auto_online_blocks_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sysfs_emit(buf, "%s\n",
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online_type_to_str[mhp_default_online_type]);
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}
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|
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static ssize_t auto_online_blocks_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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const int online_type = mhp_online_type_from_str(buf);
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|
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if (online_type < 0)
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return -EINVAL;
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mhp_default_online_type = online_type;
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return count;
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}
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static DEVICE_ATTR_RW(auto_online_blocks);
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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 probe_store(struct device *dev, struct device_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, ret;
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unsigned long pages_per_block = PAGES_PER_SECTION * sections_per_block;
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ret = kstrtoull(buf, 0, &phys_addr);
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if (ret)
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return ret;
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|
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if (phys_addr & ((pages_per_block << PAGE_SHIFT) - 1))
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return -EINVAL;
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|
|
ret = lock_device_hotplug_sysfs();
|
|
if (ret)
|
|
return ret;
|
|
|
|
nid = memory_add_physaddr_to_nid(phys_addr);
|
|
ret = __add_memory(nid, phys_addr,
|
|
MIN_MEMORY_BLOCK_SIZE * sections_per_block,
|
|
MHP_NONE);
|
|
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = count;
|
|
out:
|
|
unlock_device_hotplug();
|
|
return ret;
|
|
}
|
|
|
|
static DEVICE_ATTR_WO(probe);
|
|
#endif
|
|
|
|
#ifdef CONFIG_MEMORY_FAILURE
|
|
/*
|
|
* Support for offlining pages of memory
|
|
*/
|
|
|
|
/* Soft offline a page */
|
|
static ssize_t soft_offline_page_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
int ret;
|
|
u64 pfn;
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
if (kstrtoull(buf, 0, &pfn) < 0)
|
|
return -EINVAL;
|
|
pfn >>= PAGE_SHIFT;
|
|
ret = soft_offline_page(pfn, 0);
|
|
return ret == 0 ? count : ret;
|
|
}
|
|
|
|
/* Forcibly offline a page, including killing processes. */
|
|
static ssize_t hard_offline_page_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
int ret;
|
|
u64 pfn;
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
if (kstrtoull(buf, 0, &pfn) < 0)
|
|
return -EINVAL;
|
|
pfn >>= PAGE_SHIFT;
|
|
ret = memory_failure(pfn, MF_SW_SIMULATED);
|
|
if (ret == -EOPNOTSUPP)
|
|
ret = 0;
|
|
return ret ? ret : count;
|
|
}
|
|
|
|
static DEVICE_ATTR_WO(soft_offline_page);
|
|
static DEVICE_ATTR_WO(hard_offline_page);
|
|
#endif
|
|
|
|
/* See phys_device_show(). */
|
|
int __weak arch_get_memory_phys_device(unsigned long start_pfn)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* A reference for the returned memory block device is acquired.
|
|
*
|
|
* Called under device_hotplug_lock.
|
|
*/
|
|
static struct memory_block *find_memory_block_by_id(unsigned long block_id)
|
|
{
|
|
struct memory_block *mem;
|
|
|
|
mem = xa_load(&memory_blocks, block_id);
|
|
if (mem)
|
|
get_device(&mem->dev);
|
|
return mem;
|
|
}
|
|
|
|
/*
|
|
* Called under device_hotplug_lock.
|
|
*/
|
|
struct memory_block *find_memory_block(unsigned long section_nr)
|
|
{
|
|
unsigned long block_id = memory_block_id(section_nr);
|
|
|
|
return find_memory_block_by_id(block_id);
|
|
}
|
|
|
|
static struct attribute *memory_memblk_attrs[] = {
|
|
&dev_attr_phys_index.attr,
|
|
&dev_attr_state.attr,
|
|
&dev_attr_phys_device.attr,
|
|
&dev_attr_removable.attr,
|
|
#ifdef CONFIG_MEMORY_HOTREMOVE
|
|
&dev_attr_valid_zones.attr,
|
|
#endif
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group memory_memblk_attr_group = {
|
|
.attrs = memory_memblk_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *memory_memblk_attr_groups[] = {
|
|
&memory_memblk_attr_group,
|
|
NULL,
|
|
};
|
|
|
|
static int __add_memory_block(struct memory_block *memory)
|
|
{
|
|
int ret;
|
|
|
|
memory->dev.bus = &memory_subsys;
|
|
memory->dev.id = memory->start_section_nr / sections_per_block;
|
|
memory->dev.release = memory_block_release;
|
|
memory->dev.groups = memory_memblk_attr_groups;
|
|
memory->dev.offline = memory->state == MEM_OFFLINE;
|
|
|
|
ret = device_register(&memory->dev);
|
|
if (ret) {
|
|
put_device(&memory->dev);
|
|
return ret;
|
|
}
|
|
ret = xa_err(xa_store(&memory_blocks, memory->dev.id, memory,
|
|
GFP_KERNEL));
|
|
if (ret)
|
|
device_unregister(&memory->dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct zone *early_node_zone_for_memory_block(struct memory_block *mem,
|
|
int nid)
|
|
{
|
|
const unsigned long start_pfn = section_nr_to_pfn(mem->start_section_nr);
|
|
const unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block;
|
|
struct zone *zone, *matching_zone = NULL;
|
|
pg_data_t *pgdat = NODE_DATA(nid);
|
|
int i;
|
|
|
|
/*
|
|
* This logic only works for early memory, when the applicable zones
|
|
* already span the memory block. We don't expect overlapping zones on
|
|
* a single node for early memory. So if we're told that some PFNs
|
|
* of a node fall into this memory block, we can assume that all node
|
|
* zones that intersect with the memory block are actually applicable.
|
|
* No need to look at the memmap.
|
|
*/
|
|
for (i = 0; i < MAX_NR_ZONES; i++) {
|
|
zone = pgdat->node_zones + i;
|
|
if (!populated_zone(zone))
|
|
continue;
|
|
if (!zone_intersects(zone, start_pfn, nr_pages))
|
|
continue;
|
|
if (!matching_zone) {
|
|
matching_zone = zone;
|
|
continue;
|
|
}
|
|
/* Spans multiple zones ... */
|
|
matching_zone = NULL;
|
|
break;
|
|
}
|
|
return matching_zone;
|
|
}
|
|
|
|
#ifdef CONFIG_NUMA
|
|
/**
|
|
* memory_block_add_nid() - Indicate that system RAM falling into this memory
|
|
* block device (partially) belongs to the given node.
|
|
* @mem: The memory block device.
|
|
* @nid: The node id.
|
|
* @context: The memory initialization context.
|
|
*
|
|
* Indicate that system RAM falling into this memory block (partially) belongs
|
|
* to the given node. If the context indicates ("early") that we are adding the
|
|
* node during node device subsystem initialization, this will also properly
|
|
* set/adjust mem->zone based on the zone ranges of the given node.
|
|
*/
|
|
void memory_block_add_nid(struct memory_block *mem, int nid,
|
|
enum meminit_context context)
|
|
{
|
|
if (context == MEMINIT_EARLY && mem->nid != nid) {
|
|
/*
|
|
* For early memory we have to determine the zone when setting
|
|
* the node id and handle multiple nodes spanning a single
|
|
* memory block by indicate via zone == NULL that we're not
|
|
* dealing with a single zone. So if we're setting the node id
|
|
* the first time, determine if there is a single zone. If we're
|
|
* setting the node id a second time to a different node,
|
|
* invalidate the single detected zone.
|
|
*/
|
|
if (mem->nid == NUMA_NO_NODE)
|
|
mem->zone = early_node_zone_for_memory_block(mem, nid);
|
|
else
|
|
mem->zone = NULL;
|
|
}
|
|
|
|
/*
|
|
* If this memory block spans multiple nodes, we only indicate
|
|
* the last processed node. If we span multiple nodes (not applicable
|
|
* to hotplugged memory), zone == NULL will prohibit memory offlining
|
|
* and consequently unplug.
|
|
*/
|
|
mem->nid = nid;
|
|
}
|
|
#endif
|
|
|
|
static int add_memory_block(unsigned long block_id, unsigned long state,
|
|
unsigned long nr_vmemmap_pages,
|
|
struct memory_group *group)
|
|
{
|
|
struct memory_block *mem;
|
|
int ret = 0;
|
|
|
|
mem = find_memory_block_by_id(block_id);
|
|
if (mem) {
|
|
put_device(&mem->dev);
|
|
return -EEXIST;
|
|
}
|
|
mem = kzalloc(sizeof(*mem), GFP_KERNEL);
|
|
if (!mem)
|
|
return -ENOMEM;
|
|
|
|
mem->start_section_nr = block_id * sections_per_block;
|
|
mem->state = state;
|
|
mem->nid = NUMA_NO_NODE;
|
|
mem->nr_vmemmap_pages = nr_vmemmap_pages;
|
|
INIT_LIST_HEAD(&mem->group_next);
|
|
|
|
#ifndef CONFIG_NUMA
|
|
if (state == MEM_ONLINE)
|
|
/*
|
|
* MEM_ONLINE at this point implies early memory. With NUMA,
|
|
* we'll determine the zone when setting the node id via
|
|
* memory_block_add_nid(). Memory hotplug updated the zone
|
|
* manually when memory onlining/offlining succeeds.
|
|
*/
|
|
mem->zone = early_node_zone_for_memory_block(mem, NUMA_NO_NODE);
|
|
#endif /* CONFIG_NUMA */
|
|
|
|
ret = __add_memory_block(mem);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (group) {
|
|
mem->group = group;
|
|
list_add(&mem->group_next, &group->memory_blocks);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init add_boot_memory_block(unsigned long base_section_nr)
|
|
{
|
|
int section_count = 0;
|
|
unsigned long nr;
|
|
|
|
for (nr = base_section_nr; nr < base_section_nr + sections_per_block;
|
|
nr++)
|
|
if (present_section_nr(nr))
|
|
section_count++;
|
|
|
|
if (section_count == 0)
|
|
return 0;
|
|
return add_memory_block(memory_block_id(base_section_nr),
|
|
MEM_ONLINE, 0, NULL);
|
|
}
|
|
|
|
static int add_hotplug_memory_block(unsigned long block_id,
|
|
unsigned long nr_vmemmap_pages,
|
|
struct memory_group *group)
|
|
{
|
|
return add_memory_block(block_id, MEM_OFFLINE, nr_vmemmap_pages, group);
|
|
}
|
|
|
|
static void remove_memory_block(struct memory_block *memory)
|
|
{
|
|
if (WARN_ON_ONCE(memory->dev.bus != &memory_subsys))
|
|
return;
|
|
|
|
WARN_ON(xa_erase(&memory_blocks, memory->dev.id) == NULL);
|
|
|
|
if (memory->group) {
|
|
list_del(&memory->group_next);
|
|
memory->group = NULL;
|
|
}
|
|
|
|
/* drop the ref. we got via find_memory_block() */
|
|
put_device(&memory->dev);
|
|
device_unregister(&memory->dev);
|
|
}
|
|
|
|
/*
|
|
* Create memory block devices for the given memory area. Start and size
|
|
* have to be aligned to memory block granularity. Memory block devices
|
|
* will be initialized as offline.
|
|
*
|
|
* Called under device_hotplug_lock.
|
|
*/
|
|
int create_memory_block_devices(unsigned long start, unsigned long size,
|
|
unsigned long vmemmap_pages,
|
|
struct memory_group *group)
|
|
{
|
|
const unsigned long start_block_id = pfn_to_block_id(PFN_DOWN(start));
|
|
unsigned long end_block_id = pfn_to_block_id(PFN_DOWN(start + size));
|
|
struct memory_block *mem;
|
|
unsigned long block_id;
|
|
int ret = 0;
|
|
|
|
if (WARN_ON_ONCE(!IS_ALIGNED(start, memory_block_size_bytes()) ||
|
|
!IS_ALIGNED(size, memory_block_size_bytes())))
|
|
return -EINVAL;
|
|
|
|
for (block_id = start_block_id; block_id != end_block_id; block_id++) {
|
|
ret = add_hotplug_memory_block(block_id, vmemmap_pages, group);
|
|
if (ret)
|
|
break;
|
|
}
|
|
if (ret) {
|
|
end_block_id = block_id;
|
|
for (block_id = start_block_id; block_id != end_block_id;
|
|
block_id++) {
|
|
mem = find_memory_block_by_id(block_id);
|
|
if (WARN_ON_ONCE(!mem))
|
|
continue;
|
|
remove_memory_block(mem);
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Remove memory block devices for the given memory area. Start and size
|
|
* have to be aligned to memory block granularity. Memory block devices
|
|
* have to be offline.
|
|
*
|
|
* Called under device_hotplug_lock.
|
|
*/
|
|
void remove_memory_block_devices(unsigned long start, unsigned long size)
|
|
{
|
|
const unsigned long start_block_id = pfn_to_block_id(PFN_DOWN(start));
|
|
const unsigned long end_block_id = pfn_to_block_id(PFN_DOWN(start + size));
|
|
struct memory_block *mem;
|
|
unsigned long block_id;
|
|
|
|
if (WARN_ON_ONCE(!IS_ALIGNED(start, memory_block_size_bytes()) ||
|
|
!IS_ALIGNED(size, memory_block_size_bytes())))
|
|
return;
|
|
|
|
for (block_id = start_block_id; block_id != end_block_id; block_id++) {
|
|
mem = find_memory_block_by_id(block_id);
|
|
if (WARN_ON_ONCE(!mem))
|
|
continue;
|
|
num_poisoned_pages_sub(-1UL, memblk_nr_poison(mem));
|
|
unregister_memory_block_under_nodes(mem);
|
|
remove_memory_block(mem);
|
|
}
|
|
}
|
|
|
|
static struct attribute *memory_root_attrs[] = {
|
|
#ifdef CONFIG_ARCH_MEMORY_PROBE
|
|
&dev_attr_probe.attr,
|
|
#endif
|
|
|
|
#ifdef CONFIG_MEMORY_FAILURE
|
|
&dev_attr_soft_offline_page.attr,
|
|
&dev_attr_hard_offline_page.attr,
|
|
#endif
|
|
|
|
&dev_attr_block_size_bytes.attr,
|
|
&dev_attr_auto_online_blocks.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group memory_root_attr_group = {
|
|
.attrs = memory_root_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *memory_root_attr_groups[] = {
|
|
&memory_root_attr_group,
|
|
NULL,
|
|
};
|
|
|
|
/*
|
|
* Initialize the sysfs support for memory devices. At the time this function
|
|
* is called, we cannot have concurrent creation/deletion of memory block
|
|
* devices, the device_hotplug_lock is not needed.
|
|
*/
|
|
void __init memory_dev_init(void)
|
|
{
|
|
int ret;
|
|
unsigned long block_sz, nr;
|
|
|
|
/* Validate the configured memory block size */
|
|
block_sz = memory_block_size_bytes();
|
|
if (!is_power_of_2(block_sz) || block_sz < MIN_MEMORY_BLOCK_SIZE)
|
|
panic("Memory block size not suitable: 0x%lx\n", block_sz);
|
|
sections_per_block = block_sz / MIN_MEMORY_BLOCK_SIZE;
|
|
|
|
ret = subsys_system_register(&memory_subsys, memory_root_attr_groups);
|
|
if (ret)
|
|
panic("%s() failed to register subsystem: %d\n", __func__, ret);
|
|
|
|
/*
|
|
* Create entries for memory sections that were found
|
|
* during boot and have been initialized
|
|
*/
|
|
for (nr = 0; nr <= __highest_present_section_nr;
|
|
nr += sections_per_block) {
|
|
ret = add_boot_memory_block(nr);
|
|
if (ret)
|
|
panic("%s() failed to add memory block: %d\n", __func__,
|
|
ret);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* walk_memory_blocks - walk through all present memory blocks overlapped
|
|
* by the range [start, start + size)
|
|
*
|
|
* @start: start address of the memory range
|
|
* @size: size of the memory range
|
|
* @arg: argument passed to func
|
|
* @func: callback for each memory section walked
|
|
*
|
|
* This function walks through all present memory blocks overlapped by the
|
|
* range [start, start + size), calling func on each memory block.
|
|
*
|
|
* In case func() returns an error, walking is aborted and the error is
|
|
* returned.
|
|
*
|
|
* Called under device_hotplug_lock.
|
|
*/
|
|
int walk_memory_blocks(unsigned long start, unsigned long size,
|
|
void *arg, walk_memory_blocks_func_t func)
|
|
{
|
|
const unsigned long start_block_id = phys_to_block_id(start);
|
|
const unsigned long end_block_id = phys_to_block_id(start + size - 1);
|
|
struct memory_block *mem;
|
|
unsigned long block_id;
|
|
int ret = 0;
|
|
|
|
if (!size)
|
|
return 0;
|
|
|
|
for (block_id = start_block_id; block_id <= end_block_id; block_id++) {
|
|
mem = find_memory_block_by_id(block_id);
|
|
if (!mem)
|
|
continue;
|
|
|
|
ret = func(mem, arg);
|
|
put_device(&mem->dev);
|
|
if (ret)
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
struct for_each_memory_block_cb_data {
|
|
walk_memory_blocks_func_t func;
|
|
void *arg;
|
|
};
|
|
|
|
static int for_each_memory_block_cb(struct device *dev, void *data)
|
|
{
|
|
struct memory_block *mem = to_memory_block(dev);
|
|
struct for_each_memory_block_cb_data *cb_data = data;
|
|
|
|
return cb_data->func(mem, cb_data->arg);
|
|
}
|
|
|
|
/**
|
|
* for_each_memory_block - walk through all present memory blocks
|
|
*
|
|
* @arg: argument passed to func
|
|
* @func: callback for each memory block walked
|
|
*
|
|
* This function walks through all present memory blocks, calling func on
|
|
* each memory block.
|
|
*
|
|
* In case func() returns an error, walking is aborted and the error is
|
|
* returned.
|
|
*/
|
|
int for_each_memory_block(void *arg, walk_memory_blocks_func_t func)
|
|
{
|
|
struct for_each_memory_block_cb_data cb_data = {
|
|
.func = func,
|
|
.arg = arg,
|
|
};
|
|
|
|
return bus_for_each_dev(&memory_subsys, NULL, &cb_data,
|
|
for_each_memory_block_cb);
|
|
}
|
|
|
|
/*
|
|
* This is an internal helper to unify allocation and initialization of
|
|
* memory groups. Note that the passed memory group will be copied to a
|
|
* dynamically allocated memory group. After this call, the passed
|
|
* memory group should no longer be used.
|
|
*/
|
|
static int memory_group_register(struct memory_group group)
|
|
{
|
|
struct memory_group *new_group;
|
|
uint32_t mgid;
|
|
int ret;
|
|
|
|
if (!node_possible(group.nid))
|
|
return -EINVAL;
|
|
|
|
new_group = kzalloc(sizeof(group), GFP_KERNEL);
|
|
if (!new_group)
|
|
return -ENOMEM;
|
|
*new_group = group;
|
|
INIT_LIST_HEAD(&new_group->memory_blocks);
|
|
|
|
ret = xa_alloc(&memory_groups, &mgid, new_group, xa_limit_31b,
|
|
GFP_KERNEL);
|
|
if (ret) {
|
|
kfree(new_group);
|
|
return ret;
|
|
} else if (group.is_dynamic) {
|
|
xa_set_mark(&memory_groups, mgid, MEMORY_GROUP_MARK_DYNAMIC);
|
|
}
|
|
return mgid;
|
|
}
|
|
|
|
/**
|
|
* memory_group_register_static() - Register a static memory group.
|
|
* @nid: The node id.
|
|
* @max_pages: The maximum number of pages we'll have in this static memory
|
|
* group.
|
|
*
|
|
* Register a new static memory group and return the memory group id.
|
|
* All memory in the group belongs to a single unit, such as a DIMM. All
|
|
* memory belonging to a static memory group is added in one go to be removed
|
|
* in one go -- it's static.
|
|
*
|
|
* Returns an error if out of memory, if the node id is invalid, if no new
|
|
* memory groups can be registered, or if max_pages is invalid (0). Otherwise,
|
|
* returns the new memory group id.
|
|
*/
|
|
int memory_group_register_static(int nid, unsigned long max_pages)
|
|
{
|
|
struct memory_group group = {
|
|
.nid = nid,
|
|
.s = {
|
|
.max_pages = max_pages,
|
|
},
|
|
};
|
|
|
|
if (!max_pages)
|
|
return -EINVAL;
|
|
return memory_group_register(group);
|
|
}
|
|
EXPORT_SYMBOL_GPL(memory_group_register_static);
|
|
|
|
/**
|
|
* memory_group_register_dynamic() - Register a dynamic memory group.
|
|
* @nid: The node id.
|
|
* @unit_pages: Unit in pages in which is memory added/removed in this dynamic
|
|
* memory group.
|
|
*
|
|
* Register a new dynamic memory group and return the memory group id.
|
|
* Memory within a dynamic memory group is added/removed dynamically
|
|
* in unit_pages.
|
|
*
|
|
* Returns an error if out of memory, if the node id is invalid, if no new
|
|
* memory groups can be registered, or if unit_pages is invalid (0, not a
|
|
* power of two, smaller than a single memory block). Otherwise, returns the
|
|
* new memory group id.
|
|
*/
|
|
int memory_group_register_dynamic(int nid, unsigned long unit_pages)
|
|
{
|
|
struct memory_group group = {
|
|
.nid = nid,
|
|
.is_dynamic = true,
|
|
.d = {
|
|
.unit_pages = unit_pages,
|
|
},
|
|
};
|
|
|
|
if (!unit_pages || !is_power_of_2(unit_pages) ||
|
|
unit_pages < PHYS_PFN(memory_block_size_bytes()))
|
|
return -EINVAL;
|
|
return memory_group_register(group);
|
|
}
|
|
EXPORT_SYMBOL_GPL(memory_group_register_dynamic);
|
|
|
|
/**
|
|
* memory_group_unregister() - Unregister a memory group.
|
|
* @mgid: the memory group id
|
|
*
|
|
* Unregister a memory group. If any memory block still belongs to this
|
|
* memory group, unregistering will fail.
|
|
*
|
|
* Returns -EINVAL if the memory group id is invalid, returns -EBUSY if some
|
|
* memory blocks still belong to this memory group and returns 0 if
|
|
* unregistering succeeded.
|
|
*/
|
|
int memory_group_unregister(int mgid)
|
|
{
|
|
struct memory_group *group;
|
|
|
|
if (mgid < 0)
|
|
return -EINVAL;
|
|
|
|
group = xa_load(&memory_groups, mgid);
|
|
if (!group)
|
|
return -EINVAL;
|
|
if (!list_empty(&group->memory_blocks))
|
|
return -EBUSY;
|
|
xa_erase(&memory_groups, mgid);
|
|
kfree(group);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(memory_group_unregister);
|
|
|
|
/*
|
|
* This is an internal helper only to be used in core memory hotplug code to
|
|
* lookup a memory group. We don't care about locking, as we don't expect a
|
|
* memory group to get unregistered while adding memory to it -- because
|
|
* the group and the memory is managed by the same driver.
|
|
*/
|
|
struct memory_group *memory_group_find_by_id(int mgid)
|
|
{
|
|
return xa_load(&memory_groups, mgid);
|
|
}
|
|
|
|
/*
|
|
* This is an internal helper only to be used in core memory hotplug code to
|
|
* walk all dynamic memory groups excluding a given memory group, either
|
|
* belonging to a specific node, or belonging to any node.
|
|
*/
|
|
int walk_dynamic_memory_groups(int nid, walk_memory_groups_func_t func,
|
|
struct memory_group *excluded, void *arg)
|
|
{
|
|
struct memory_group *group;
|
|
unsigned long index;
|
|
int ret = 0;
|
|
|
|
xa_for_each_marked(&memory_groups, index, group,
|
|
MEMORY_GROUP_MARK_DYNAMIC) {
|
|
if (group == excluded)
|
|
continue;
|
|
#ifdef CONFIG_NUMA
|
|
if (nid != NUMA_NO_NODE && group->nid != nid)
|
|
continue;
|
|
#endif /* CONFIG_NUMA */
|
|
ret = func(group, arg);
|
|
if (ret)
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
#if defined(CONFIG_MEMORY_FAILURE) && defined(CONFIG_MEMORY_HOTPLUG)
|
|
void memblk_nr_poison_inc(unsigned long pfn)
|
|
{
|
|
const unsigned long block_id = pfn_to_block_id(pfn);
|
|
struct memory_block *mem = find_memory_block_by_id(block_id);
|
|
|
|
if (mem)
|
|
atomic_long_inc(&mem->nr_hwpoison);
|
|
}
|
|
|
|
void memblk_nr_poison_sub(unsigned long pfn, long i)
|
|
{
|
|
const unsigned long block_id = pfn_to_block_id(pfn);
|
|
struct memory_block *mem = find_memory_block_by_id(block_id);
|
|
|
|
if (mem)
|
|
atomic_long_sub(i, &mem->nr_hwpoison);
|
|
}
|
|
|
|
static unsigned long memblk_nr_poison(struct memory_block *mem)
|
|
{
|
|
return atomic_long_read(&mem->nr_hwpoison);
|
|
}
|
|
#endif
|