Release 4.12 drivers/base/memory.c

Directory: drivers/base
/*
 * Memory subsystem support
 *
 * Written by Matt Tolentino <matthew.e.tolentino@intel.com>
 *            Dave Hansen <haveblue@us.ibm.com>
 *
 * This file provides the necessary infrastructure to represent
 * a SPARSEMEM-memory-model system's physical memory in /sysfs.
 * All arch-independent code that assumes MEMORY_HOTPLUG requires
 * SPARSEMEM should be contained here, or in mm/memory_hotplug.c.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/topology.h>
#include <linux/capability.h>
#include <linux/device.h>
#include <linux/memory.h>
#include <linux/memory_hotplug.h>
#include <linux/mm.h>
#include <linux/mutex.h>
#include <linux/stat.h>
#include <linux/slab.h>

#include <linux/atomic.h>
#include <linux/uaccess.h>

static DEFINE_MUTEX(mem_sysfs_mutex);


#define MEMORY_CLASS_NAME	"memory"


#define to_memory_block(dev) container_of(dev, struct memory_block, dev)


static int sections_per_block;



static inline int base_memory_block_id(int section_nr)
{
	return section_nr / sections_per_block;
}

Contributors
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Nathan Fontenot 15 100.00% 1 100.00%
Total 15 100.00% 1 100.00%

static int memory_subsys_online(struct device *dev);
static int memory_subsys_offline(struct device *dev);


static struct bus_type memory_subsys = {
	.name = MEMORY_CLASS_NAME,
	.dev_name = MEMORY_CLASS_NAME,
	.online = memory_subsys_online,
	.offline = memory_subsys_offline,
};

static BLOCKING_NOTIFIER_HEAD(memory_chain);



int register_memory_notifier(struct notifier_block *nb)
{
	return blocking_notifier_chain_register(&memory_chain, nb);
}
Contributors
Person Tokens Prop Commits CommitProp
Dave Hansen 18 94.74% 1 50.00%
Alan Stern 1 5.26% 1 50.00%
Total 19 100.00% 2 100.00%


EXPORT_SYMBOL(register_memory_notifier);



void unregister_memory_notifier(struct notifier_block *nb)
{
	blocking_notifier_chain_unregister(&memory_chain, nb);
}
Contributors
Person Tokens Prop Commits CommitProp
Dave Hansen 17 94.44% 1 50.00%
Alan Stern 1 5.56% 1 50.00%
Total 18 100.00% 2 100.00%


EXPORT_SYMBOL(unregister_memory_notifier);

static ATOMIC_NOTIFIER_HEAD(memory_isolate_chain);



int register_memory_isolate_notifier(struct notifier_block *nb)
{
	return atomic_notifier_chain_register(&memory_isolate_chain, nb);
}
Contributors
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Robert Jennings 19 100.00% 1 100.00%
Total 19 100.00% 1 100.00%


EXPORT_SYMBOL(register_memory_isolate_notifier);



void unregister_memory_isolate_notifier(struct notifier_block *nb)
{
	atomic_notifier_chain_unregister(&memory_isolate_chain, nb);
}
Contributors
Person Tokens Prop Commits CommitProp
Robert Jennings 18 100.00% 1 100.00%
Total 18 100.00% 1 100.00%


EXPORT_SYMBOL(unregister_memory_isolate_notifier);



static void memory_block_release(struct device *dev)
{
	struct memory_block *mem = to_memory_block(dev);

	kfree(mem);
}

Contributors
Person Tokens Prop Commits CommitProp
Yasuaki Ishimatsu 25 96.15% 1 50.00%
Gu Zheng 1 3.85% 1 50.00%
Total 26 100.00% 2 100.00%



unsigned long __weak memory_block_size_bytes(void)
{
	return MIN_MEMORY_BLOCK_SIZE;
}

Contributors
Person Tokens Prop Commits CommitProp
Nathan Fontenot 12 100.00% 1 100.00%
Total 12 100.00% 1 100.00%



static unsigned long get_memory_block_size(void)
{
	unsigned long block_sz;

	block_sz = memory_block_size_bytes();

	/* Validate blk_sz is a power of 2 and not less than section size */
	if ((block_sz & (block_sz - 1)) || (block_sz < MIN_MEMORY_BLOCK_SIZE)) {
		WARN_ON(1);
		block_sz = MIN_MEMORY_BLOCK_SIZE;
	}

	return block_sz;
}

Contributors
Person Tokens Prop Commits CommitProp
Nathan Fontenot 51 100.00% 1 100.00%
Total 51 100.00% 1 100.00%

/*
 * use this as the physical section index that this memsection
 * uses.
 */



static ssize_t show_mem_start_phys_index(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct memory_block *mem = to_memory_block(dev);
	unsigned long phys_index;

	phys_index = mem->start_section_nr / sections_per_block;
	return sprintf(buf, "%08lx\n", phys_index);
}

Contributors
Person Tokens Prop Commits CommitProp
Dave Hansen 28 53.85% 1 20.00%
Nathan Fontenot 17 32.69% 1 20.00%
Andi Kleen 4 7.69% 1 20.00%
Kay Sievers 2 3.85% 1 20.00%
Gu Zheng 1 1.92% 1 20.00%
Total 52 100.00% 5 100.00%

/*
 * Show whether the section of memory is likely to be hot-removable
 */


static ssize_t show_mem_removable(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	unsigned long i, pfn;
	int ret = 1;
	struct memory_block *mem = to_memory_block(dev);

	for (i = 0; i < sections_per_block; i++) {
		if (!present_section_nr(mem->start_section_nr + i))
			continue;
		pfn = section_nr_to_pfn(mem->start_section_nr + i);
		ret &= is_mem_section_removable(pfn, PAGES_PER_SECTION);
	}

	return sprintf(buf, "%d\n", ret);
}

Contributors
Person Tokens Prop Commits CommitProp
Badari Pulavarty 53 53.54% 1 14.29%
Nathan Fontenot 26 26.26% 2 28.57%
Russ Anderson 13 13.13% 1 14.29%
Stephen Rothwell 4 4.04% 1 14.29%
Kay Sievers 2 2.02% 1 14.29%
Gu Zheng 1 1.01% 1 14.29%
Total 99 100.00% 7 100.00%

/*
 * online, offline, going offline, etc.
 */


static ssize_t show_mem_state(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct memory_block *mem = to_memory_block(dev);
	ssize_t len = 0;

	/*
         * We can probably put these states in a nice little array
         * so that they're not open-coded
         */
	switch (mem->state) {
	case MEM_ONLINE:
		len = sprintf(buf, "online\n");
		break;
	case MEM_OFFLINE:
		len = sprintf(buf, "offline\n");
		break;
	case MEM_GOING_OFFLINE:
		len = sprintf(buf, "going-offline\n");
		break;
	default:
		len = sprintf(buf, "ERROR-UNKNOWN-%ld\n",
				mem->state);
		WARN_ON(1);
		break;
	}

	return len;
}

Contributors
Person Tokens Prop Commits CommitProp
Dave Hansen 99 93.40% 1 25.00%
Andi Kleen 4 3.77% 1 25.00%
Kay Sievers 2 1.89% 1 25.00%
Gu Zheng 1 0.94% 1 25.00%
Total 106 100.00% 4 100.00%



int memory_notify(unsigned long val, void *v)
{
	return blocking_notifier_call_chain(&memory_chain, val, v);
}

Contributors
Person Tokens Prop Commits CommitProp
Dave Hansen 23 95.83% 1 50.00%
Alan Stern 1 4.17% 1 50.00%
Total 24 100.00% 2 100.00%



int memory_isolate_notify(unsigned long val, void *v)
{
	return atomic_notifier_call_chain(&memory_isolate_chain, val, v);
}

Contributors
Person Tokens Prop Commits CommitProp
Robert Jennings 24 100.00% 1 100.00%
Total 24 100.00% 1 100.00%

/*
 * The probe routines leave the pages reserved, just as the bootmem code does.
 * Make sure they're still that way.
 */


static bool pages_correctly_reserved(unsigned long start_pfn)
{
	int i, j;
	struct page *page;
	unsigned long pfn = start_pfn;

	/*
         * memmap between sections is not contiguous except with
         * SPARSEMEM_VMEMMAP. We lookup the page once per section
         * and assume memmap is contiguous within each section
         */
	for (i = 0; i < sections_per_block; i++, pfn += PAGES_PER_SECTION) {
		if (WARN_ON_ONCE(!pfn_valid(pfn)))
			return false;
		page = pfn_to_page(pfn);

		for (j = 0; j < PAGES_PER_SECTION; j++) {
			if (PageReserved(page + j))
				continue;

			printk(KERN_WARNING "section number %ld page number %d "
				"not reserved, was it already online?\n",
				pfn_to_section_nr(pfn), j);

			return false;
		}
	}

	return true;
}

Contributors
Person Tokens Prop Commits CommitProp
Mel Gorman 61 54.46% 1 25.00%
Dave Hansen 45 40.18% 1 25.00%
Greg Kroah-Hartman 3 2.68% 1 25.00%
Nathan Fontenot 3 2.68% 1 25.00%
Total 112 100.00% 4 100.00%

/*
 * MEMORY_HOTPLUG depends on SPARSEMEM in mm/Kconfig, so it is
 * OK to have direct references to sparsemem variables in here.
 * Must already be protected by mem_hotplug_begin().
 */

static int

memory_block_action(unsigned long phys_index, unsigned long action, int online_type)
{
	unsigned long start_pfn;
	unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block;
	int ret;

	start_pfn = section_nr_to_pfn(phys_index);

	switch (action) {
	case MEM_ONLINE:
		if (!pages_correctly_reserved(start_pfn))
			return -EBUSY;

		ret = online_pages(start_pfn, nr_pages, online_type);
		break;
	case MEM_OFFLINE:
		ret = offline_pages(start_pfn, nr_pages);
		break;
	default:
		WARN(1, KERN_WARNING "%s(%ld, %ld) unknown action: "
		     "%ld\n", __func__, phys_index, action, action);
		ret = -EINVAL;
	}

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Dave Hansen 48 43.24% 1 10.00%
Mel Gorman 43 38.74% 1 10.00%
Lai Jiangshan 5 4.50% 1 10.00%
Sheng Yong 3 2.70% 1 10.00%
Nathan Fontenot 3 2.70% 1 10.00%
Arjan van de Ven 3 2.70% 1 10.00%
Wen Congyang 2 1.80% 1 10.00%
Anton Blanchard 2 1.80% 1 10.00%
Harvey Harrison 1 0.90% 1 10.00%
Zhang Zhen 1 0.90% 1 10.00%
Total 111 100.00% 10 100.00%



static int memory_block_change_state(struct memory_block *mem,
		unsigned long to_state, unsigned long from_state_req)
{
	int ret = 0;

	if (mem->state != from_state_req)
		return -EINVAL;

	if (to_state == MEM_OFFLINE)
		mem->state = MEM_GOING_OFFLINE;

	ret = memory_block_action(mem->start_section_nr, to_state,
				mem->online_type);

	mem->state = ret ? from_state_req : to_state;

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Dave Hansen 39 51.32% 1 10.00%
Nathan Fontenot 21 27.63% 3 30.00%
Rafael J. Wysocki 9 11.84% 2 20.00%
Seth Jennings 3 3.95% 1 10.00%
Lai Jiangshan 2 2.63% 1 10.00%
Michael Holzheu 1 1.32% 1 10.00%
Anton Blanchard 1 1.32% 1 10.00%
Total 76 100.00% 10 100.00%

/* The device lock serializes operations on memory_subsys_[online|offline] */


static int memory_subsys_online(struct device *dev)
{
	struct memory_block *mem = to_memory_block(dev);
	int ret;

	if (mem->state == MEM_ONLINE)
		return 0;

	/*
         * If we are called from store_mem_state(), online_type will be
         * set >= 0 Otherwise we were called from the device online
         * attribute and need to set the online_type.
         */
	if (mem->online_type < 0)
		mem->online_type = MMOP_ONLINE_KEEP;

	/* Already under protection of mem_hotplug_begin() */
	ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE);

	/* clear online_type */
	mem->online_type = -1;

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Rafael J. Wysocki 40 54.79% 1 16.67%
Seth Jennings 27 36.99% 1 16.67%
Dave Hansen 3 4.11% 1 16.67%
David Rientjes 1 1.37% 1 16.67%
Gu Zheng 1 1.37% 1 16.67%
Tang Chen 1 1.37% 1 16.67%
Total 73 100.00% 6 100.00%



static int memory_subsys_offline(struct device *dev)
{
	struct memory_block *mem = to_memory_block(dev);

	if (mem->state == MEM_OFFLINE)
		return 0;

	/* Can't offline block with non-present sections */
	if (mem->section_count != sections_per_block)
		return -EINVAL;

	return memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE);
}

Contributors
Person Tokens Prop Commits CommitProp
Rafael J. Wysocki 36 65.45% 1 20.00%
Seth Jennings 15 27.27% 2 40.00%
Wen Congyang 3 5.45% 1 20.00%
Gu Zheng 1 1.82% 1 20.00%
Total 55 100.00% 5 100.00%


static ssize_t

store_mem_state(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct memory_block *mem = to_memory_block(dev);
	int ret, online_type;

	ret = lock_device_hotplug_sysfs();
	if (ret)
		return ret;

	if (sysfs_streq(buf, "online_kernel"))
		online_type = MMOP_ONLINE_KERNEL;
	else if (sysfs_streq(buf, "online_movable"))
		online_type = MMOP_ONLINE_MOVABLE;
	else if (sysfs_streq(buf, "online"))
		online_type = MMOP_ONLINE_KEEP;
	else if (sysfs_streq(buf, "offline"))
		online_type = MMOP_OFFLINE;
	else {
		ret = -EINVAL;
		goto err;
	}

	/*
         * Memory hotplug needs to hold mem_hotplug_begin() for probe to find
         * the correct memory block to online before doing device_online(dev),
         * which will take dev->mutex.  Take the lock early to prevent an
         * inversion, memory_subsys_online() callbacks will be implemented by
         * assuming it's already protected.
         */
	mem_hotplug_begin();

	switch (online_type) {
	case MMOP_ONLINE_KERNEL:
	case MMOP_ONLINE_MOVABLE:
	case MMOP_ONLINE_KEEP:
		mem->online_type = online_type;
		ret = device_online(&mem->dev);
		break;
	case MMOP_OFFLINE:
		ret = device_offline(&mem->dev);
		break;
	default:
		ret = -EINVAL; /* should never happen */
	}

	mem_hotplug_done();
err:
	unlock_device_hotplug();

	if (ret < 0)
		return ret;
	if (ret)
		return -EINVAL;

	return count;
}

Contributors
Person Tokens Prop Commits CommitProp
Dave Hansen 48 23.76% 1 6.67%
Seth Jennings 35 17.33% 1 6.67%
Rafael J. Wysocki 29 14.36% 1 6.67%
Lai Jiangshan 28 13.86% 1 6.67%
Tang Chen 12 5.94% 2 13.33%
Yasuaki Ishimatsu 10 4.95% 1 6.67%
Reza Arbab 10 4.95% 1 6.67%
Linus Torvalds 7 3.47% 1 6.67%
David Rientjes 7 3.47% 1 6.67%
Gu Zheng 5 2.48% 1 6.67%
Michael Holzheu 5 2.48% 1 6.67%
Andi Kleen 3 1.49% 1 6.67%
Kay Sievers 2 0.99% 1 6.67%
Wen Congyang 1 0.50% 1 6.67%
Total 202 100.00% 15 100.00%

/*
 * phys_device is a bad name for this.  What I really want
 * is a way to differentiate between memory ranges that
 * are part of physical devices that constitute
 * a complete removable unit or fru.
 * i.e. do these ranges belong to the same physical device,
 * s.t. if I offline all of these sections I can then
 * remove the physical device?
 */


static ssize_t show_phys_device(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct memory_block *mem = to_memory_block(dev);
	return sprintf(buf, "%d\n", mem->phys_device);
}

Contributors
Person Tokens Prop Commits CommitProp
Dave Hansen 35 83.33% 1 25.00%
Andi Kleen 4 9.52% 1 25.00%
Kay Sievers 2 4.76% 1 25.00%
Gu Zheng 1 2.38% 1 25.00%
Total 42 100.00% 4 100.00%

#ifdef CONFIG_MEMORY_HOTREMOVE


static ssize_t show_valid_zones(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct memory_block *mem = to_memory_block(dev);
	unsigned long start_pfn, end_pfn;
	unsigned long valid_start, valid_end, valid_pages;
	unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block;
	struct zone *zone;
	int zone_shift = 0;

	start_pfn = section_nr_to_pfn(mem->start_section_nr);
	end_pfn = start_pfn + nr_pages;

	/* The block contains more than one zone can not be offlined. */
	if (!test_pages_in_a_zone(start_pfn, end_pfn, &valid_start, &valid_end))
		return sprintf(buf, "none\n");

	zone = page_zone(pfn_to_page(valid_start));
	valid_pages = valid_end - valid_start;

	/* MMOP_ONLINE_KEEP */
	sprintf(buf, "%s", zone->name);

	/* MMOP_ONLINE_KERNEL */
	zone_can_shift(valid_start, valid_pages, ZONE_NORMAL, &zone_shift);
	if (zone_shift) {
		strcat(buf, " ");
		strcat(buf, (zone + zone_shift)->name);
	}

	/* MMOP_ONLINE_MOVABLE */
	zone_can_shift(valid_start, valid_pages, ZONE_MOVABLE, &zone_shift);
	if (zone_shift) {
		strcat(buf, " ");
		strcat(buf, (zone + zone_shift)->name);
	}

	strcat(buf, "\n");

	return strlen(buf);
}
Contributors
Person Tokens Prop Commits CommitProp
Zhang Zhen 128 57.92% 1 25.00%
Reza Arbab 59 26.70% 1 25.00%
Toshi Kani 28 12.67% 1 25.00%
Yasuaki Ishimatsu 6 2.71% 1 25.00%
Total 221 100.00% 4 100.00%

static DEVICE_ATTR(valid_zones, 0444, show_valid_zones, NULL);
#endif

static DEVICE_ATTR(phys_index, 0444, show_mem_start_phys_index, NULL);
static DEVICE_ATTR(state, 0644, show_mem_state, store_mem_state);
static DEVICE_ATTR(phys_device, 0444, show_phys_device, NULL);
static DEVICE_ATTR(removable, 0444, show_mem_removable, NULL);

/*
 * Block size attribute stuff
 */

static ssize_t

print_block_size(struct device *dev, struct device_attribute *attr,
		 char *buf)
{
	return sprintf(buf, "%lx\n", get_memory_block_size());
}

Contributors
Person Tokens Prop Commits CommitProp
Dave Hansen 19 61.29% 1 16.67%
Andi Kleen 4 12.90% 1 16.67%
Kay Sievers 3 9.68% 1 16.67%
Fengguang Wu 2 6.45% 1 16.67%
Nathan Fontenot 2 6.45% 1 16.67%
Linus Torvalds 1 3.23% 1 16.67%
Total 31 100.00% 6 100.00%

static DEVICE_ATTR(block_size_bytes, 0444, print_block_size, NULL);

/*
 * Memory auto online policy.
 */


static ssize_t

show_auto_online_blocks(struct device *dev, struct device_attribute *attr,
			char *buf)
{
	if (memhp_auto_online)
		return sprintf(buf, "online\n");
	else
		return sprintf(buf, "offline\n");
}

Contributors
Person Tokens Prop Commits CommitProp
Vitaly Kuznetsov 41 100.00% 1 100.00%
Total 41 100.00% 1 100.00%


static ssize_t

store_auto_online_blocks(struct device *dev, struct device_attribute *attr,
			 const char *buf, size_t count)
{
	if (sysfs_streq(buf, "online"))
		memhp_auto_online = true;
	else if (sysfs_streq(buf, "offline"))
		memhp_auto_online = false;
	else
		return -EINVAL;

	return count;
}

Contributors
Person Tokens Prop Commits CommitProp
Vitaly Kuznetsov 59 100.00% 1 100.00%
Total 59 100.00% 1 100.00%

static DEVICE_ATTR(auto_online_blocks, 0644, show_auto_online_blocks,
		   store_auto_online_blocks);

/*
 * Some architectures will have custom drivers to do this, and
 * will not need to do it from userspace.  The fake hot-add code
 * as well as ppc64 will do all of their discovery in userspace
 * and will require this interface.
 */
#ifdef CONFIG_ARCH_MEMORY_PROBE

static ssize_t

memory_probe_store(struct device *dev, struct device_attribute *attr,
		   const char *buf, size_t count)
{
	u64 phys_addr;
	int nid, ret;
	unsigned long pages_per_block = PAGES_PER_SECTION * sections_per_block;

	ret = kstrtoull(buf, 0, &phys_addr);
	if (ret)
		return ret;

	if (phys_addr & ((pages_per_block << PAGE_SHIFT) - 1))
		return -EINVAL;

	nid = memory_add_physaddr_to_nid(phys_addr);
	ret = add_memory(nid, phys_addr,
			 MIN_MEMORY_BLOCK_SIZE * sections_per_block);

	if (ret)
		goto out;

	ret = count;
out:
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Dave Hansen 44 38.94% 1 10.00%
Anton Blanchard 26 23.01% 1 10.00%
Zhang Zhen 12 10.62% 1 10.00%
Yasunori Goto 10 8.85% 1 10.00%
Nikanth Karthikesan 7 6.19% 1 10.00%
Andi Kleen 4 3.54% 1 10.00%
Kay Sievers 3 2.65% 1 10.00%
John Allen 3 2.65% 1 10.00%
Nathan Fontenot 2 1.77% 1 10.00%
Fengguang Wu 2 1.77% 1 10.00%
Total 113 100.00% 10 100.00%

static DEVICE_ATTR(probe, S_IWUSR, NULL, memory_probe_store);
#endif

#ifdef CONFIG_MEMORY_FAILURE
/*
 * Support for offlining pages of memory
 */

/* Soft offline a page */

static ssize_t

store_soft_offline_page(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;
	if (!pfn_valid(pfn))
		return -ENXIO;
	ret = soft_offline_page(pfn_to_page(pfn), 0);
	return ret == 0 ? count : ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Andi Kleen 91 93.81% 2 40.00%
Kay Sievers 3 3.09% 1 20.00%
Fengguang Wu 2 2.06% 1 20.00%
Jingoo Han 1 1.03% 1 20.00%
Total 97 100.00% 5 100.00%

/* Forcibly offline a page, including killing processes. */

static ssize_t

store_hard_offline_page(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, 0, 0);
	return ret ? ret : count;
}

Contributors
Person Tokens Prop Commits CommitProp
Andi Kleen 75 91.46% 2 33.33%
Kay Sievers 3 3.66% 1 16.67%
Fengguang Wu 2 2.44% 1 16.67%
Jingoo Han 1 1.22% 1 16.67%
Tony Luck 1 1.22% 1 16.67%
Total 82 100.00% 6 100.00%

static DEVICE_ATTR(soft_offline_page, S_IWUSR, NULL, store_soft_offline_page);
static DEVICE_ATTR(hard_offline_page, S_IWUSR, NULL, store_hard_offline_page);
#endif

/*
 * Note that phys_device is optional.  It is here to allow for
 * differentiation between which *physical* devices each
 * section belongs to...
 */


int __weak arch_get_memory_phys_device(unsigned long start_pfn)
{
	return 0;
}

Contributors
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Heiko Carstens 13 100.00% 1 100.00%
Total 13 100.00% 1 100.00%

/*
 * A reference for the returned object is held and the reference for the
 * hinted object is released.
 */


struct memory_block *find_memory_block_hinted(struct mem_section *section,
					      struct memory_block *hint)
{
	int block_id = base_memory_block_id(__section_nr(section));
	struct device *hintdev = hint ? &hint->dev : NULL;
	struct device *dev;

	dev = subsys_find_device_by_id(&memory_subsys, block_id, hintdev);
	if (hint)
		put_device(&hint->dev);
	if (!dev)
		return NULL;
	return to_memory_block(dev);
}

Contributors
Person Tokens Prop Commits CommitProp
Nathan Fontenot 55 64.71% 2 50.00%
Kay Sievers 29 34.12% 1 25.00%
Gu Zheng 1 1.18% 1 25.00%
Total 85 100.00% 4 100.00%

/*
 * For now, we have a linear search to go find the appropriate
 * memory_block corresponding to a particular phys_index. If
 * this gets to be a real problem, we can always use a radix
 * tree or something here.
 *
 * This could be made generic for all device subsystems.
 */


struct memory_block *find_memory_block(struct mem_section *section)
{
	return find_memory_block_hinted(section, NULL);
}

Contributors
Person Tokens Prop Commits CommitProp
Nathan Fontenot 20 100.00% 1 100.00%
Total 20 100.00% 1 100.00%


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 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)
{
	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;

	return device_register(&memory->dev);
}

Contributors
Person Tokens Prop Commits CommitProp
Nathan Fontenot 56 81.16% 1 33.33%
Linus Torvalds 12 17.39% 1 33.33%
Seth Jennings 1 1.45% 1 33.33%
Total 69 100.00% 3 100.00%



static int init_memory_block(struct memory_block **memory,
			     struct mem_section *section, unsigned long state)
{
	struct memory_block *mem;
	unsigned long start_pfn;
	int scn_nr;
	int ret = 0;

	mem = kzalloc(sizeof(*mem), GFP_KERNEL);
	if (!mem)
		return -ENOMEM;

	scn_nr = __section_nr(section);
	mem->start_section_nr =
			base_memory_block_id(scn_nr) * sections_per_block;
	mem->end_section_nr = mem->start_section_nr + sections_per_block - 1;
	mem->state = state;
	start_pfn = section_nr_to_pfn(mem->start_section_nr);
	mem->phys_device = arch_get_memory_phys_device(start_pfn);

	ret = register_memory(mem);

	*memory = mem;
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Nathan Fontenot 73 56.59% 4 57.14%
Dave Hansen 44 34.11% 2 28.57%
Heiko Carstens 12 9.30% 1 14.29%
Total 129 100.00% 7 100.00%



static int add_memory_block(int base_section_nr)
{
	struct memory_block *mem;
	int i, ret, section_count = 0, section_nr;

	for (i = base_section_nr;
	     (i < base_section_nr + sections_per_block) && i < NR_MEM_SECTIONS;
	     i++) {
		if (!present_section_nr(i))
			continue;
		if (section_count == 0)
			section_nr = i;
		section_count++;
	}

	if (section_count == 0)
		return 0;
	ret = init_memory_block(&mem, __nr_to_section(section_nr), MEM_ONLINE);
	if (ret)
		return ret;
	mem->section_count = section_count;
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Seth Jennings 58 52.73% 2 28.57%
Nathan Fontenot 31 28.18% 2 28.57%
Yinghai Lu 11 10.00% 1 14.29%
Dave Hansen 7 6.36% 1 14.29%
Heiko Carstens 3 2.73% 1 14.29%
Total 110 100.00% 7 100.00%



static bool is_zone_device_section(struct mem_section *ms)
{
	struct page *page;

	page = sparse_decode_mem_map(ms->section_mem_map, __section_nr(ms));
	return is_zone_device_page(page);
}

Contributors
Person Tokens Prop Commits CommitProp
Dan J Williams 36 100.00% 1 100.00%
Total 36 100.00% 1 100.00%

/*
 * need an interface for the VM to add new memory regions,
 * but without onlining it.
 */


int register_new_memory(int nid, struct mem_section *section)
{
	int ret = 0;
	struct memory_block *mem;

	if (is_zone_device_section(section))
		return 0;

	mutex_lock(&mem_sysfs_mutex);

	mem = find_memory_block(section);
	if (mem) {
		mem->section_count++;
		put_device(&mem->dev);
	} else {
		ret = init_memory_block(&mem, section, MEM_OFFLINE);
		if (ret)
			goto out;
		mem->section_count++;
	}

	if (mem->section_count == sections_per_block)
		ret = register_mem_sect_under_node(mem, nid);
out:
	mutex_unlock(&mem_sysfs_mutex);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Nathan Fontenot 69 57.50% 2 18.18%
Seth Jennings 16 13.33% 3 27.27%
Gary Hade 12 10.00% 1 9.09%
Dan J Williams 10 8.33% 1 9.09%
Yinghai Lu 6 5.00% 1 9.09%
Dave Hansen 4 3.33% 1 9.09%
David Rientjes 2 1.67% 1 9.09%
Kay Sievers 1 0.83% 1 9.09%
Total 120 100.00% 11 100.00%

#ifdef CONFIG_MEMORY_HOTREMOVE

static void

unregister_memory(struct memory_block *memory)
{
	BUG_ON(memory->dev.bus != &memory_subsys);

	/* drop the ref. we got in remove_memory_block() */
	put_device(&memory->dev);
	device_unregister(&memory->dev);
}

Contributors
Person Tokens Prop Commits CommitProp
David Rientjes 39 97.50% 1 50.00%
Seth Jennings 1 2.50% 1 50.00%
Total 40 100.00% 2 100.00%



static int remove_memory_section(unsigned long node_id,
			       struct mem_section *section, int phys_device)
{
	struct memory_block *mem;

	if (is_zone_device_section(section))
		return 0;

	mutex_lock(&mem_sysfs_mutex);
	mem = find_memory_block(section);
	unregister_mem_sect_under_nodes(mem, __section_nr(section));

	mem->section_count--;
	if (mem->section_count == 0)
		unregister_memory(mem);
	else
		put_device(&mem->dev);

	mutex_unlock(&mem_sysfs_mutex);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Nathan Fontenot 44 47.83% 4 40.00%
Dave Hansen 34 36.96% 1 10.00%
Dan J Williams 10 10.87% 1 10.00%
Seth Jennings 2 2.17% 2 20.00%
Kay Sievers 1 1.09% 1 10.00%
David Rientjes 1 1.09% 1 10.00%
Total 92 100.00% 10 100.00%



int unregister_memory_section(struct mem_section *section)
{
	if (!present_section(section))
		return -EINVAL;

	return remove_memory_section(0, section, 0);
}
Contributors
Person Tokens Prop Commits CommitProp
Dave Hansen 30 93.75% 1 33.33%
Andy Whitcroft 1 3.12% 1 33.33%
Seth Jennings 1 3.12% 1 33.33%
Total 32 100.00% 3 100.00%

#endif /* CONFIG_MEMORY_HOTREMOVE */

/* return true if the memory block is offlined, otherwise, return false */


bool is_memblock_offlined(struct memory_block *mem)
{
	return mem->state == MEM_OFFLINE;
}

Contributors
Person Tokens Prop Commits CommitProp
Yasuaki Ishimatsu 17 100.00% 1 100.00%
Total 17 100.00% 1 100.00%


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...
 */


int __init memory_dev_init(void)
{
	unsigned int i;
	int ret;
	int err;
	unsigned long block_sz;

	ret = subsys_system_register(&memory_subsys, memory_root_attr_groups);
	if (ret)
		goto out;

	block_sz = get_memory_block_size();
	sections_per_block = block_sz / MIN_MEMORY_BLOCK_SIZE;

	/*
         * Create entries for memory sections that were found
         * during boot and have been initialized
         */
	mutex_lock(&mem_sysfs_mutex);
	for (i = 0; i < NR_MEM_SECTIONS; i += sections_per_block) {
		err = add_memory_block(i);
		if (!ret)
			ret = err;
	}
	mutex_unlock(&mem_sysfs_mutex);

out:
	if (ret)
		printk(KERN_ERR "%s() failed: %d\n", __func__, ret);
	return ret;
}
Contributors
Person Tokens Prop Commits CommitProp
Dave Hansen 43 37.72% 1 12.50%
Andrew Morton 36 31.58% 1 12.50%
Nathan Fontenot 16 14.04% 2 25.00%
Seth Jennings 15 13.16% 2 25.00%
Kay Sievers 3 2.63% 1 12.50%
Harvey Harrison 1 0.88% 1 12.50%
Total 114 100.00% 8 100.00%

Overall Contributors
Person Tokens Prop Commits CommitProp
Dave Hansen 734 23.55% 2 2.41%
Nathan Fontenot 655 21.01% 8 9.64%
Andi Kleen 217 6.96% 4 4.82%
Seth Jennings 175 5.61% 10 12.05%
Zhang Zhen 168 5.39% 3 3.61%
Rafael J. Wysocki 144 4.62% 2 2.41%
Vitaly Kuznetsov 118 3.79% 1 1.20%
Mel Gorman 105 3.37% 1 1.20%
Robert Jennings 77 2.47% 1 1.20%
Kay Sievers 74 2.37% 2 2.41%
Reza Arbab 69 2.21% 2 2.41%
Badari Pulavarty 65 2.09% 1 1.20%
Yasuaki Ishimatsu 59 1.89% 4 4.82%
David Rientjes 58 1.86% 2 2.41%
Dan J Williams 56 1.80% 1 1.20%
Andrew Morton 36 1.15% 1 1.20%
Lai Jiangshan 35 1.12% 1 1.20%
Anton Blanchard 29 0.93% 2 2.41%
Toshi Kani 28 0.90% 1 1.20%
Heiko Carstens 28 0.90% 1 1.20%
Linus Torvalds 21 0.67% 4 4.82%
Gu Zheng 20 0.64% 1 1.20%
Yinghai Lu 17 0.55% 1 1.20%
Tang Chen 13 0.42% 2 2.41%
Russ Anderson 13 0.42% 1 1.20%
Gary Hade 12 0.38% 1 1.20%
Hannes Hering 10 0.32% 1 1.20%
Yasunori Goto 10 0.32% 1 1.20%
Fengguang Wu 8 0.26% 1 1.20%
Alan Stern 7 0.22% 1 1.20%
Nikanth Karthikesan 7 0.22% 1 1.20%
Michael Holzheu 6 0.19% 1 1.20%
Wen Congyang 6 0.19% 2 2.41%
David Shaohua Li 4 0.13% 1 1.20%
Stephen Rothwell 4 0.13% 1 1.20%
Arjan van de Ven 3 0.10% 1 1.20%
Tejun Heo 3 0.10% 1 1.20%
Greg Kroah-Hartman 3 0.10% 1 1.20%
Sheng Yong 3 0.10% 1 1.20%
John Allen 3 0.10% 1 1.20%
Daniel Walker 3 0.10% 1 1.20%
Jingoo Han 2 0.06% 1 1.20%
Harvey Harrison 2 0.06% 1 1.20%
Felipe Balbi 2 0.06% 1 1.20%
Randy Dunlap 2 0.06% 1 1.20%
Tony Luck 1 0.03% 1 1.20%
Arun Sharma 1 0.03% 1 1.20%
Andy Whitcroft 1 0.03% 1 1.20%
Total 3117 100.00% 83 100.00%
Directory: drivers/base

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Nathan Fontenot	15	100.00%	1	100.00%
Total	15	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.12 drivers/base/memory.c

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