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![Wei Yang](/assets/img/avatar_default.png)
memory_block may have a larger granularity than section, this is why we have base_section_nr. But base_memory_block_id seems a little misleading, since there is no larger granularity concept which groups several memory_block. What we need here is the exact memory_block_id to a section_nr. Let's rename it to make it more precise. Signed-off-by: Wei Yang <richard.weiyang@linux.alibaba.com> Link: https://lore.kernel.org/r/20200623025701.2016-2-richard.weiyang@linux.alibaba.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
830 lines
20 KiB
C
830 lines
20 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 memhp_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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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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/*
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* Show the first physical section index (number) of this memory block.
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*/
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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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unsigned long phys_index;
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phys_index = mem->start_section_nr / sections_per_block;
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return sprintf(buf, "%08lx\n", phys_index);
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}
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/*
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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 sprintf(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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ssize_t len = 0;
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/*
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* We can probably put these states in a nice little array
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* so that they're not open-coded
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*/
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switch (mem->state) {
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case MEM_ONLINE:
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len = sprintf(buf, "online\n");
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break;
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case MEM_OFFLINE:
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len = sprintf(buf, "offline\n");
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break;
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case MEM_GOING_OFFLINE:
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len = sprintf(buf, "going-offline\n");
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break;
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default:
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len = sprintf(buf, "ERROR-UNKNOWN-%ld\n",
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mem->state);
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WARN_ON(1);
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break;
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}
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return len;
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}
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int memory_notify(unsigned long val, void *v)
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{
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return blocking_notifier_call_chain(&memory_chain, val, v);
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}
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/*
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* MEMORY_HOTPLUG depends on SPARSEMEM in mm/Kconfig, so it is
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* OK to have direct references to sparsemem variables in here.
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*/
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static int
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memory_block_action(unsigned long start_section_nr, unsigned long action,
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int online_type, int nid)
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{
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unsigned long start_pfn;
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unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block;
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int ret;
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start_pfn = section_nr_to_pfn(start_section_nr);
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switch (action) {
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case MEM_ONLINE:
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ret = online_pages(start_pfn, nr_pages, online_type, nid);
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break;
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case MEM_OFFLINE:
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ret = offline_pages(start_pfn, nr_pages);
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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__, 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->start_section_nr, to_state,
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mem->online_type, mem->nid);
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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 = memhp_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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* 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 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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return sprintf(buf, "%d\n", mem->phys_device);
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}
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#ifdef CONFIG_MEMORY_HOTREMOVE
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static void print_allowed_zone(char *buf, int nid, unsigned long start_pfn,
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unsigned long nr_pages, int online_type,
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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, start_pfn, nr_pages);
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if (zone != default_zone) {
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strcat(buf, " ");
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strcat(buf, zone->name);
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}
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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 zone *default_zone;
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int nid;
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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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* The block contains more than one zone can not be offlined.
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* This can happen e.g. for ZONE_DMA and ZONE_DMA32
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*/
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default_zone = test_pages_in_a_zone(start_pfn,
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start_pfn + nr_pages);
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if (!default_zone)
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return sprintf(buf, "none\n");
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strcat(buf, default_zone->name);
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goto out;
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}
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nid = mem->nid;
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default_zone = zone_for_pfn_range(MMOP_ONLINE, nid, start_pfn,
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nr_pages);
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strcat(buf, default_zone->name);
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print_allowed_zone(buf, nid, start_pfn, nr_pages, MMOP_ONLINE_KERNEL,
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default_zone);
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print_allowed_zone(buf, nid, start_pfn, nr_pages, MMOP_ONLINE_MOVABLE,
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default_zone);
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out:
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strcat(buf, "\n");
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return strlen(buf);
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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 sprintf(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 sprintf(buf, "%s\n",
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online_type_to_str[memhp_default_online_type]);
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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 = memhp_online_type_from_str(buf);
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if (online_type < 0)
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return -EINVAL;
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memhp_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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if (phys_addr & ((pages_per_block << PAGE_SHIFT) - 1))
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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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nid = memory_add_physaddr_to_nid(phys_addr);
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ret = __add_memory(nid, phys_addr,
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MIN_MEMORY_BLOCK_SIZE * sections_per_block);
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if (ret)
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goto out;
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ret = count;
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out:
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unlock_device_hotplug();
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return ret;
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}
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static DEVICE_ATTR_WO(probe);
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#endif
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#ifdef CONFIG_MEMORY_FAILURE
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/*
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* Support for offlining pages of memory
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*/
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/* Soft offline a page */
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static ssize_t soft_offline_page_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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int ret;
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u64 pfn;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (kstrtoull(buf, 0, &pfn) < 0)
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return -EINVAL;
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pfn >>= PAGE_SHIFT;
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ret = soft_offline_page(pfn, 0);
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return ret == 0 ? count : ret;
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}
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/* Forcibly offline a page, including killing processes. */
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static ssize_t hard_offline_page_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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int ret;
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u64 pfn;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (kstrtoull(buf, 0, &pfn) < 0)
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return -EINVAL;
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pfn >>= PAGE_SHIFT;
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ret = memory_failure(pfn, 0);
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return ret ? ret : count;
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}
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static DEVICE_ATTR_WO(soft_offline_page);
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static DEVICE_ATTR_WO(hard_offline_page);
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#endif
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/*
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* Note that phys_device is optional. It is here to allow for
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* differentiation between which *physical* devices each
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* section belongs to...
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*/
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int __weak arch_get_memory_phys_device(unsigned long start_pfn)
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{
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return 0;
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}
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/*
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* A reference for the returned memory block device is acquired.
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*
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* Called under device_hotplug_lock.
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*/
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static struct memory_block *find_memory_block_by_id(unsigned long block_id)
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{
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struct memory_block *mem;
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mem = xa_load(&memory_blocks, block_id);
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if (mem)
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get_device(&mem->dev);
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return mem;
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}
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/*
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* Called under device_hotplug_lock.
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*/
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struct memory_block *find_memory_block(struct mem_section *section)
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{
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unsigned long block_id = memory_block_id(__section_nr(section));
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return find_memory_block_by_id(block_id);
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}
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static struct attribute *memory_memblk_attrs[] = {
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&dev_attr_phys_index.attr,
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&dev_attr_state.attr,
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&dev_attr_phys_device.attr,
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&dev_attr_removable.attr,
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#ifdef CONFIG_MEMORY_HOTREMOVE
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|
&dev_attr_valid_zones.attr,
|
|
#endif
|
|
NULL
|
|
};
|
|
|
|
static 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,
|
|
};
|
|
|
|
/*
|
|
* register_memory - Setup a sysfs device for a memory block
|
|
*/
|
|
static
|
|
int register_memory(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) {
|
|
put_device(&memory->dev);
|
|
device_unregister(&memory->dev);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int init_memory_block(unsigned long block_id, unsigned long state)
|
|
{
|
|
struct memory_block *mem;
|
|
unsigned long start_pfn;
|
|
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;
|
|
start_pfn = section_nr_to_pfn(mem->start_section_nr);
|
|
mem->phys_device = arch_get_memory_phys_device(start_pfn);
|
|
mem->nid = NUMA_NO_NODE;
|
|
|
|
ret = register_memory(mem);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int add_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 init_memory_block(memory_block_id(base_section_nr),
|
|
MEM_ONLINE);
|
|
}
|
|
|
|
static void unregister_memory(struct memory_block *memory)
|
|
{
|
|
if (WARN_ON_ONCE(memory->dev.bus != &memory_subsys))
|
|
return;
|
|
|
|
WARN_ON(xa_erase(&memory_blocks, memory->dev.id) == 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)
|
|
{
|
|
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 = init_memory_block(block_id, MEM_OFFLINE);
|
|
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;
|
|
unregister_memory(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;
|
|
unregister_memory_block_under_nodes(mem);
|
|
unregister_memory(mem);
|
|
}
|
|
}
|
|
|
|
/* return true if the memory block is offlined, otherwise, return false */
|
|
bool is_memblock_offlined(struct memory_block *mem)
|
|
{
|
|
return mem->state == MEM_OFFLINE;
|
|
}
|
|
|
|
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 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_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);
|
|
}
|