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ACPI / memhotplug: Bind removable memory blocks to ACPI device nodes 

During ACPI memory hotplug configuration bind memory blocks residing
in modules removable through the standard ACPI mechanism to struct
acpi_device objects associated with ACPI namespace objects
representing those modules.  Accordingly, unbind those memory blocks
from the struct acpi_device objects when the memory modules in
question are being removed.

When "offline" operation for devices representing memory blocks is
introduced, this will allow the ACPI core's device hot-remove code to
use it to carry out remove_memory() for those memory blocks and check
the results of that before it actually removes the modules holding
them from the system.

Since walk_memory_range() is used for accessing all memory blocks
corresponding to a given ACPI namespace object, it is exported from
memory_hotplug.c so that the code in acpi_memhotplug.c can use it.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Vasilis Liaskovitis <vasilis.liaskovitis@profitbricks.com>
Reviewed-by: Toshi Kani <toshi.kani@hp.com>
This commit is contained in:
Rafael J. Wysocki 2013-05-08 00:29:49 +02:00
parent ac212b6980
commit e2ff39400d
3 changed files with 55 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

53
drivers/acpi/acpi_memhotplug.c
View File

@ -28,6 +28,7 @@
*/
#include <linux/acpi.h>
#include <linux/memory.h>
#include <linux/memory_hotplug.h>
#include "internal.h"
@ -166,13 +167,50 @@ static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
return 0;
}
static unsigned long acpi_meminfo_start_pfn(struct acpi_memory_info *info)
{
return PFN_DOWN(info->start_addr);
}
static unsigned long acpi_meminfo_end_pfn(struct acpi_memory_info *info)
{
return PFN_UP(info->start_addr + info->length-1);
}
static int acpi_bind_memblk(struct memory_block *mem, void *arg)
{
return acpi_bind_one(&mem->dev, (acpi_handle)arg);
}
static int acpi_bind_memory_blocks(struct acpi_memory_info *info,
acpi_handle handle)
{
return walk_memory_range(acpi_meminfo_start_pfn(info),
acpi_meminfo_end_pfn(info), (void *)handle,
acpi_bind_memblk);
}
static int acpi_unbind_memblk(struct memory_block *mem, void *arg)
{
acpi_unbind_one(&mem->dev);
return 0;
}
static void acpi_unbind_memory_blocks(struct acpi_memory_info *info,
acpi_handle handle)
{
walk_memory_range(acpi_meminfo_start_pfn(info),
acpi_meminfo_end_pfn(info), NULL, acpi_unbind_memblk);
}
static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
{
acpi_handle handle = mem_device->device->handle;
int result, num_enabled = 0;
struct acpi_memory_info *info;
int node;
node = acpi_get_node(mem_device->device->handle);
node = acpi_get_node(handle);
/*
* Tell the VM there is more memory here...
* Note: Assume that this function returns zero on success
@ -203,6 +241,12 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
if (result && result != -EEXIST)
continue;
result = acpi_bind_memory_blocks(info, handle);
if (result) {
acpi_unbind_memory_blocks(info, handle);
return -ENODEV;
}
info->enabled = 1;
/*
@ -229,10 +273,11 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
static int acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
{
acpi_handle handle = mem_device->device->handle;
int result = 0, nid;
struct acpi_memory_info *info, *n;
nid = acpi_get_node(mem_device->device->handle);
nid = acpi_get_node(handle);
list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
if (!info->enabled)
@ -240,6 +285,8 @@ static int acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
if (nid < 0)
nid = memory_add_physaddr_to_nid(info->start_addr);
acpi_unbind_memory_blocks(info, handle);
result = remove_memory(nid, info->start_addr, info->length);
if (result)
return result;
@ -300,7 +347,7 @@ static int acpi_memory_device_add(struct acpi_device *device,
if (result) {
dev_err(&device->dev, "acpi_memory_enable_device() error\n");
acpi_memory_device_free(mem_device);
return -ENODEV;
return result;
}
dev_dbg(&device->dev, "Memory device configured by ACPI\n");

2
include/linux/memory_hotplug.h
View File

@ -245,6 +245,8 @@ static inline int is_mem_section_removable(unsigned long pfn,
static inline void try_offline_node(int nid) {}
#endif /* CONFIG_MEMORY_HOTREMOVE */
extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
void *arg, int (*func)(struct memory_block *, void *));
extern int mem_online_node(int nid);
extern int add_memory(int nid, u64 start, u64 size);
extern int arch_add_memory(int nid, u64 start, u64 size);

4
mm/memory_hotplug.c
View File

@ -1618,6 +1618,7 @@ int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
{
return __offline_pages(start_pfn, start_pfn + nr_pages, 120 * HZ);
}
#endif /* CONFIG_MEMORY_HOTREMOVE */
/**
* walk_memory_range - walks through all mem sections in [start_pfn, end_pfn)
@ -1631,7 +1632,7 @@ int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
*
* Returns the return value of func.
*/
static int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
void *arg, int (*func)(struct memory_block *, void *))
{
struct memory_block *mem = NULL;
@ -1668,6 +1669,7 @@ static int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
return 0;
}
#ifdef CONFIG_MEMORY_HOTREMOVE
/**
* offline_memory_block_cb - callback function for offlining memory block
* @mem: the memory block to be offlined