mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Jarkko Nikula](/assets/img/avatar_default.png)
There is no need to carry potentially outdated Free Software Foundation mailing address in file headers since the COPYING file includes it. Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
390 lines
10 KiB
C
390 lines
10 KiB
C
/*
|
|
* Copyright (C) 2004, 2013 Intel Corporation
|
|
* Author: Naveen B S <naveen.b.s@intel.com>
|
|
* Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
|
|
*
|
|
* All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or (at
|
|
* your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
|
|
* NON INFRINGEMENT. See the GNU General Public License for more
|
|
* details.
|
|
*
|
|
* ACPI based HotPlug driver that supports Memory Hotplug
|
|
* This driver fields notifications from firmware for memory add
|
|
* and remove operations and alerts the VM of the affected memory
|
|
* ranges.
|
|
*/
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/memory.h>
|
|
#include <linux/memory_hotplug.h>
|
|
|
|
#include "internal.h"
|
|
|
|
#define ACPI_MEMORY_DEVICE_CLASS "memory"
|
|
#define ACPI_MEMORY_DEVICE_HID "PNP0C80"
|
|
#define ACPI_MEMORY_DEVICE_NAME "Hotplug Mem Device"
|
|
|
|
#define _COMPONENT ACPI_MEMORY_DEVICE_COMPONENT
|
|
|
|
#undef PREFIX
|
|
#define PREFIX "ACPI:memory_hp:"
|
|
|
|
ACPI_MODULE_NAME("acpi_memhotplug");
|
|
|
|
static const struct acpi_device_id memory_device_ids[] = {
|
|
{ACPI_MEMORY_DEVICE_HID, 0},
|
|
{"", 0},
|
|
};
|
|
|
|
#ifdef CONFIG_ACPI_HOTPLUG_MEMORY
|
|
|
|
/* Memory Device States */
|
|
#define MEMORY_INVALID_STATE 0
|
|
#define MEMORY_POWER_ON_STATE 1
|
|
#define MEMORY_POWER_OFF_STATE 2
|
|
|
|
static int acpi_memory_device_add(struct acpi_device *device,
|
|
const struct acpi_device_id *not_used);
|
|
static void acpi_memory_device_remove(struct acpi_device *device);
|
|
|
|
static struct acpi_scan_handler memory_device_handler = {
|
|
.ids = memory_device_ids,
|
|
.attach = acpi_memory_device_add,
|
|
.detach = acpi_memory_device_remove,
|
|
.hotplug = {
|
|
.enabled = true,
|
|
},
|
|
};
|
|
|
|
struct acpi_memory_info {
|
|
struct list_head list;
|
|
u64 start_addr; /* Memory Range start physical addr */
|
|
u64 length; /* Memory Range length */
|
|
unsigned short caching; /* memory cache attribute */
|
|
unsigned short write_protect; /* memory read/write attribute */
|
|
unsigned int enabled:1;
|
|
};
|
|
|
|
struct acpi_memory_device {
|
|
struct acpi_device * device;
|
|
unsigned int state; /* State of the memory device */
|
|
struct list_head res_list;
|
|
};
|
|
|
|
static acpi_status
|
|
acpi_memory_get_resource(struct acpi_resource *resource, void *context)
|
|
{
|
|
struct acpi_memory_device *mem_device = context;
|
|
struct acpi_resource_address64 address64;
|
|
struct acpi_memory_info *info, *new;
|
|
acpi_status status;
|
|
|
|
status = acpi_resource_to_address64(resource, &address64);
|
|
if (ACPI_FAILURE(status) ||
|
|
(address64.resource_type != ACPI_MEMORY_RANGE))
|
|
return AE_OK;
|
|
|
|
list_for_each_entry(info, &mem_device->res_list, list) {
|
|
/* Can we combine the resource range information? */
|
|
if ((info->caching == address64.info.mem.caching) &&
|
|
(info->write_protect == address64.info.mem.write_protect) &&
|
|
(info->start_addr + info->length == address64.address.minimum)) {
|
|
info->length += address64.address.address_length;
|
|
return AE_OK;
|
|
}
|
|
}
|
|
|
|
new = kzalloc(sizeof(struct acpi_memory_info), GFP_KERNEL);
|
|
if (!new)
|
|
return AE_ERROR;
|
|
|
|
INIT_LIST_HEAD(&new->list);
|
|
new->caching = address64.info.mem.caching;
|
|
new->write_protect = address64.info.mem.write_protect;
|
|
new->start_addr = address64.address.minimum;
|
|
new->length = address64.address.address_length;
|
|
list_add_tail(&new->list, &mem_device->res_list);
|
|
|
|
return AE_OK;
|
|
}
|
|
|
|
static void
|
|
acpi_memory_free_device_resources(struct acpi_memory_device *mem_device)
|
|
{
|
|
struct acpi_memory_info *info, *n;
|
|
|
|
list_for_each_entry_safe(info, n, &mem_device->res_list, list)
|
|
kfree(info);
|
|
INIT_LIST_HEAD(&mem_device->res_list);
|
|
}
|
|
|
|
static int
|
|
acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
|
|
{
|
|
acpi_status status;
|
|
|
|
if (!list_empty(&mem_device->res_list))
|
|
return 0;
|
|
|
|
status = acpi_walk_resources(mem_device->device->handle, METHOD_NAME__CRS,
|
|
acpi_memory_get_resource, mem_device);
|
|
if (ACPI_FAILURE(status)) {
|
|
acpi_memory_free_device_resources(mem_device);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
|
|
{
|
|
unsigned long long current_status;
|
|
|
|
/* Get device present/absent information from the _STA */
|
|
if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle,
|
|
METHOD_NAME__STA, NULL,
|
|
¤t_status)))
|
|
return -ENODEV;
|
|
/*
|
|
* Check for device status. Device should be
|
|
* present/enabled/functioning.
|
|
*/
|
|
if (!((current_status & ACPI_STA_DEVICE_PRESENT)
|
|
&& (current_status & ACPI_STA_DEVICE_ENABLED)
|
|
&& (current_status & ACPI_STA_DEVICE_FUNCTIONING)))
|
|
return -ENODEV;
|
|
|
|
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, arg);
|
|
}
|
|
|
|
static int acpi_bind_memory_blocks(struct acpi_memory_info *info,
|
|
struct acpi_device *adev)
|
|
{
|
|
return walk_memory_range(acpi_meminfo_start_pfn(info),
|
|
acpi_meminfo_end_pfn(info), adev,
|
|
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)
|
|
{
|
|
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(handle);
|
|
/*
|
|
* Tell the VM there is more memory here...
|
|
* Note: Assume that this function returns zero on success
|
|
* We don't have memory-hot-add rollback function,now.
|
|
* (i.e. memory-hot-remove function)
|
|
*/
|
|
list_for_each_entry(info, &mem_device->res_list, list) {
|
|
if (info->enabled) { /* just sanity check...*/
|
|
num_enabled++;
|
|
continue;
|
|
}
|
|
/*
|
|
* If the memory block size is zero, please ignore it.
|
|
* Don't try to do the following memory hotplug flowchart.
|
|
*/
|
|
if (!info->length)
|
|
continue;
|
|
if (node < 0)
|
|
node = memory_add_physaddr_to_nid(info->start_addr);
|
|
|
|
result = add_memory(node, info->start_addr, info->length);
|
|
|
|
/*
|
|
* If the memory block has been used by the kernel, add_memory()
|
|
* returns -EEXIST. If add_memory() returns the other error, it
|
|
* means that this memory block is not used by the kernel.
|
|
*/
|
|
if (result && result != -EEXIST)
|
|
continue;
|
|
|
|
result = acpi_bind_memory_blocks(info, mem_device->device);
|
|
if (result) {
|
|
acpi_unbind_memory_blocks(info);
|
|
return -ENODEV;
|
|
}
|
|
|
|
info->enabled = 1;
|
|
|
|
/*
|
|
* Add num_enable even if add_memory() returns -EEXIST, so the
|
|
* device is bound to this driver.
|
|
*/
|
|
num_enabled++;
|
|
}
|
|
if (!num_enabled) {
|
|
dev_err(&mem_device->device->dev, "add_memory failed\n");
|
|
mem_device->state = MEMORY_INVALID_STATE;
|
|
return -EINVAL;
|
|
}
|
|
/*
|
|
* Sometimes the memory device will contain several memory blocks.
|
|
* When one memory block is hot-added to the system memory, it will
|
|
* be regarded as a success.
|
|
* Otherwise if the last memory block can't be hot-added to the system
|
|
* memory, it will be failure and the memory device can't be bound with
|
|
* driver.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
static void acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
|
|
{
|
|
acpi_handle handle = mem_device->device->handle;
|
|
struct acpi_memory_info *info, *n;
|
|
int nid = acpi_get_node(handle);
|
|
|
|
list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
|
|
if (!info->enabled)
|
|
continue;
|
|
|
|
if (nid == NUMA_NO_NODE)
|
|
nid = memory_add_physaddr_to_nid(info->start_addr);
|
|
|
|
acpi_unbind_memory_blocks(info);
|
|
remove_memory(nid, info->start_addr, info->length);
|
|
list_del(&info->list);
|
|
kfree(info);
|
|
}
|
|
}
|
|
|
|
static void acpi_memory_device_free(struct acpi_memory_device *mem_device)
|
|
{
|
|
if (!mem_device)
|
|
return;
|
|
|
|
acpi_memory_free_device_resources(mem_device);
|
|
mem_device->device->driver_data = NULL;
|
|
kfree(mem_device);
|
|
}
|
|
|
|
static int acpi_memory_device_add(struct acpi_device *device,
|
|
const struct acpi_device_id *not_used)
|
|
{
|
|
struct acpi_memory_device *mem_device;
|
|
int result;
|
|
|
|
if (!device)
|
|
return -EINVAL;
|
|
|
|
mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL);
|
|
if (!mem_device)
|
|
return -ENOMEM;
|
|
|
|
INIT_LIST_HEAD(&mem_device->res_list);
|
|
mem_device->device = device;
|
|
sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME);
|
|
sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS);
|
|
device->driver_data = mem_device;
|
|
|
|
/* Get the range from the _CRS */
|
|
result = acpi_memory_get_device_resources(mem_device);
|
|
if (result) {
|
|
device->driver_data = NULL;
|
|
kfree(mem_device);
|
|
return result;
|
|
}
|
|
|
|
/* Set the device state */
|
|
mem_device->state = MEMORY_POWER_ON_STATE;
|
|
|
|
result = acpi_memory_check_device(mem_device);
|
|
if (result) {
|
|
acpi_memory_device_free(mem_device);
|
|
return 0;
|
|
}
|
|
|
|
result = acpi_memory_enable_device(mem_device);
|
|
if (result) {
|
|
dev_err(&device->dev, "acpi_memory_enable_device() error\n");
|
|
acpi_memory_device_free(mem_device);
|
|
return result;
|
|
}
|
|
|
|
dev_dbg(&device->dev, "Memory device configured by ACPI\n");
|
|
return 1;
|
|
}
|
|
|
|
static void acpi_memory_device_remove(struct acpi_device *device)
|
|
{
|
|
struct acpi_memory_device *mem_device;
|
|
|
|
if (!device || !acpi_driver_data(device))
|
|
return;
|
|
|
|
mem_device = acpi_driver_data(device);
|
|
acpi_memory_remove_memory(mem_device);
|
|
acpi_memory_device_free(mem_device);
|
|
}
|
|
|
|
static bool __initdata acpi_no_memhotplug;
|
|
|
|
void __init acpi_memory_hotplug_init(void)
|
|
{
|
|
if (acpi_no_memhotplug) {
|
|
memory_device_handler.attach = NULL;
|
|
acpi_scan_add_handler(&memory_device_handler);
|
|
return;
|
|
}
|
|
acpi_scan_add_handler_with_hotplug(&memory_device_handler, "memory");
|
|
}
|
|
|
|
static int __init disable_acpi_memory_hotplug(char *str)
|
|
{
|
|
acpi_no_memhotplug = true;
|
|
return 1;
|
|
}
|
|
__setup("acpi_no_memhotplug", disable_acpi_memory_hotplug);
|
|
|
|
#else
|
|
|
|
static struct acpi_scan_handler memory_device_handler = {
|
|
.ids = memory_device_ids,
|
|
};
|
|
|
|
void __init acpi_memory_hotplug_init(void)
|
|
{
|
|
acpi_scan_add_handler(&memory_device_handler);
|
|
}
|
|
|
|
#endif /* CONFIG_ACPI_HOTPLUG_MEMORY */
|