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60a5a19e74
Introduce a new function try_offline_node() to remove sysfs file of node when all memory sections of this node are removed. If some memory sections of this node are not removed, this function does nothing. Signed-off-by: Wen Congyang <wency@cn.fujitsu.com> Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Jiang Liu <jiang.liu@huawei.com> Cc: Jianguo Wu <wujianguo@huawei.com> Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Wu Jianguo <wujianguo@huawei.com> Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
570 lines
14 KiB
C
570 lines
14 KiB
C
/*
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* Copyright (C) 2004 Intel Corporation <naveen.b.s@intel.com>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*
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* ACPI based HotPlug driver that supports Memory Hotplug
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* This driver fields notifications from firmware for memory add
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* and remove operations and alerts the VM of the affected memory
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* ranges.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/memory_hotplug.h>
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#include <linux/slab.h>
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#include <linux/acpi.h>
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#include <acpi/acpi_drivers.h>
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#define ACPI_MEMORY_DEVICE_CLASS "memory"
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#define ACPI_MEMORY_DEVICE_HID "PNP0C80"
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#define ACPI_MEMORY_DEVICE_NAME "Hotplug Mem Device"
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#define _COMPONENT ACPI_MEMORY_DEVICE_COMPONENT
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#undef PREFIX
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#define PREFIX "ACPI:memory_hp:"
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ACPI_MODULE_NAME("acpi_memhotplug");
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MODULE_AUTHOR("Naveen B S <naveen.b.s@intel.com>");
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MODULE_DESCRIPTION("Hotplug Mem Driver");
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MODULE_LICENSE("GPL");
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/* Memory Device States */
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#define MEMORY_INVALID_STATE 0
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#define MEMORY_POWER_ON_STATE 1
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#define MEMORY_POWER_OFF_STATE 2
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static int acpi_memory_device_add(struct acpi_device *device);
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static int acpi_memory_device_remove(struct acpi_device *device);
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static const struct acpi_device_id memory_device_ids[] = {
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{ACPI_MEMORY_DEVICE_HID, 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, memory_device_ids);
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static struct acpi_driver acpi_memory_device_driver = {
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.name = "acpi_memhotplug",
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.class = ACPI_MEMORY_DEVICE_CLASS,
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.ids = memory_device_ids,
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.ops = {
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.add = acpi_memory_device_add,
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.remove = acpi_memory_device_remove,
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},
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};
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struct acpi_memory_info {
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struct list_head list;
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u64 start_addr; /* Memory Range start physical addr */
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u64 length; /* Memory Range length */
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unsigned short caching; /* memory cache attribute */
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unsigned short write_protect; /* memory read/write attribute */
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unsigned int enabled:1;
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unsigned int failed:1;
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};
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struct acpi_memory_device {
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struct acpi_device * device;
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unsigned int state; /* State of the memory device */
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struct list_head res_list;
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};
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static acpi_status
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acpi_memory_get_resource(struct acpi_resource *resource, void *context)
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{
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struct acpi_memory_device *mem_device = context;
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struct acpi_resource_address64 address64;
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struct acpi_memory_info *info, *new;
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acpi_status status;
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status = acpi_resource_to_address64(resource, &address64);
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if (ACPI_FAILURE(status) ||
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(address64.resource_type != ACPI_MEMORY_RANGE))
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return AE_OK;
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list_for_each_entry(info, &mem_device->res_list, list) {
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/* Can we combine the resource range information? */
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if ((info->caching == address64.info.mem.caching) &&
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(info->write_protect == address64.info.mem.write_protect) &&
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(info->start_addr + info->length == address64.minimum)) {
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info->length += address64.address_length;
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return AE_OK;
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}
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}
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new = kzalloc(sizeof(struct acpi_memory_info), GFP_KERNEL);
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if (!new)
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return AE_ERROR;
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INIT_LIST_HEAD(&new->list);
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new->caching = address64.info.mem.caching;
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new->write_protect = address64.info.mem.write_protect;
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new->start_addr = address64.minimum;
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new->length = address64.address_length;
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list_add_tail(&new->list, &mem_device->res_list);
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return AE_OK;
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}
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static void
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acpi_memory_free_device_resources(struct acpi_memory_device *mem_device)
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{
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struct acpi_memory_info *info, *n;
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list_for_each_entry_safe(info, n, &mem_device->res_list, list)
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kfree(info);
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INIT_LIST_HEAD(&mem_device->res_list);
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}
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static int
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acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
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{
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acpi_status status;
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if (!list_empty(&mem_device->res_list))
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return 0;
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status = acpi_walk_resources(mem_device->device->handle, METHOD_NAME__CRS,
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acpi_memory_get_resource, mem_device);
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if (ACPI_FAILURE(status)) {
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acpi_memory_free_device_resources(mem_device);
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return -EINVAL;
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}
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return 0;
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}
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static int acpi_memory_get_device(acpi_handle handle,
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struct acpi_memory_device **mem_device)
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{
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struct acpi_device *device = NULL;
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int result = 0;
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acpi_scan_lock_acquire();
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acpi_bus_get_device(handle, &device);
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if (device)
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goto end;
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/*
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* Now add the notified device. This creates the acpi_device
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* and invokes .add function
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*/
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result = acpi_bus_scan(handle);
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if (result) {
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acpi_handle_warn(handle, "ACPI namespace scan failed\n");
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result = -EINVAL;
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goto out;
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}
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result = acpi_bus_get_device(handle, &device);
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if (result) {
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acpi_handle_warn(handle, "Missing device object\n");
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result = -EINVAL;
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goto out;
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}
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end:
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*mem_device = acpi_driver_data(device);
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if (!(*mem_device)) {
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dev_err(&device->dev, "driver data not found\n");
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result = -ENODEV;
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goto out;
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}
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out:
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acpi_scan_lock_release();
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return result;
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}
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static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
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{
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unsigned long long current_status;
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/* Get device present/absent information from the _STA */
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if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle, "_STA",
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NULL, ¤t_status)))
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return -ENODEV;
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/*
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* Check for device status. Device should be
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* present/enabled/functioning.
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*/
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if (!((current_status & ACPI_STA_DEVICE_PRESENT)
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&& (current_status & ACPI_STA_DEVICE_ENABLED)
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&& (current_status & ACPI_STA_DEVICE_FUNCTIONING)))
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return -ENODEV;
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return 0;
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}
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static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
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{
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int result, num_enabled = 0;
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struct acpi_memory_info *info;
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int node;
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node = acpi_get_node(mem_device->device->handle);
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/*
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* Tell the VM there is more memory here...
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* Note: Assume that this function returns zero on success
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* We don't have memory-hot-add rollback function,now.
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* (i.e. memory-hot-remove function)
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*/
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list_for_each_entry(info, &mem_device->res_list, list) {
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if (info->enabled) { /* just sanity check...*/
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num_enabled++;
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continue;
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}
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/*
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* If the memory block size is zero, please ignore it.
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* Don't try to do the following memory hotplug flowchart.
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*/
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if (!info->length)
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continue;
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if (node < 0)
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node = memory_add_physaddr_to_nid(info->start_addr);
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result = add_memory(node, info->start_addr, info->length);
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/*
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* If the memory block has been used by the kernel, add_memory()
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* returns -EEXIST. If add_memory() returns the other error, it
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* means that this memory block is not used by the kernel.
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*/
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if (result && result != -EEXIST) {
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info->failed = 1;
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continue;
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}
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if (!result)
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info->enabled = 1;
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/*
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* Add num_enable even if add_memory() returns -EEXIST, so the
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* device is bound to this driver.
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*/
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num_enabled++;
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}
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if (!num_enabled) {
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dev_err(&mem_device->device->dev, "add_memory failed\n");
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mem_device->state = MEMORY_INVALID_STATE;
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return -EINVAL;
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}
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/*
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* Sometimes the memory device will contain several memory blocks.
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* When one memory block is hot-added to the system memory, it will
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* be regarded as a success.
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* Otherwise if the last memory block can't be hot-added to the system
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* memory, it will be failure and the memory device can't be bound with
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* driver.
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*/
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return 0;
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}
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static int acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
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{
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int result = 0, nid;
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struct acpi_memory_info *info, *n;
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nid = acpi_get_node(mem_device->device->handle);
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list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
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if (info->failed)
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/* The kernel does not use this memory block */
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continue;
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if (!info->enabled)
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/*
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* The kernel uses this memory block, but it may be not
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* managed by us.
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*/
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return -EBUSY;
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if (nid < 0)
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nid = memory_add_physaddr_to_nid(info->start_addr);
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result = remove_memory(nid, info->start_addr, info->length);
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if (result)
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return result;
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list_del(&info->list);
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kfree(info);
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}
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return result;
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}
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static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
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{
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struct acpi_memory_device *mem_device;
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struct acpi_device *device;
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struct acpi_eject_event *ej_event = NULL;
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u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
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acpi_status status;
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switch (event) {
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case ACPI_NOTIFY_BUS_CHECK:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"\nReceived BUS CHECK notification for device\n"));
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/* Fall Through */
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case ACPI_NOTIFY_DEVICE_CHECK:
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if (event == ACPI_NOTIFY_DEVICE_CHECK)
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"\nReceived DEVICE CHECK notification for device\n"));
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if (acpi_memory_get_device(handle, &mem_device)) {
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acpi_handle_err(handle, "Cannot find driver data\n");
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break;
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}
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ost_code = ACPI_OST_SC_SUCCESS;
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break;
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case ACPI_NOTIFY_EJECT_REQUEST:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"\nReceived EJECT REQUEST notification for device\n"));
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status = AE_ERROR;
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acpi_scan_lock_acquire();
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if (acpi_bus_get_device(handle, &device)) {
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acpi_handle_err(handle, "Device doesn't exist\n");
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goto unlock;
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}
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mem_device = acpi_driver_data(device);
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if (!mem_device) {
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acpi_handle_err(handle, "Driver Data is NULL\n");
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goto unlock;
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}
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ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
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if (!ej_event) {
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pr_err(PREFIX "No memory, dropping EJECT\n");
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goto unlock;
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}
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get_device(&device->dev);
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ej_event->device = device;
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ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
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/* The eject is carried out asynchronously. */
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status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device,
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ej_event);
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if (ACPI_FAILURE(status)) {
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put_device(&device->dev);
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kfree(ej_event);
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}
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unlock:
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acpi_scan_lock_release();
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if (ACPI_SUCCESS(status))
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return;
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default:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Unsupported event [0x%x]\n", event));
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/* non-hotplug event; possibly handled by other handler */
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return;
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}
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/* Inform firmware that the hotplug operation has completed */
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(void) acpi_evaluate_hotplug_ost(handle, event, ost_code, NULL);
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}
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static void acpi_memory_device_free(struct acpi_memory_device *mem_device)
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{
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if (!mem_device)
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return;
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acpi_memory_free_device_resources(mem_device);
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kfree(mem_device);
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}
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static int acpi_memory_device_add(struct acpi_device *device)
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{
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int result;
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struct acpi_memory_device *mem_device = NULL;
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if (!device)
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return -EINVAL;
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mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL);
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if (!mem_device)
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return -ENOMEM;
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INIT_LIST_HEAD(&mem_device->res_list);
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mem_device->device = device;
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sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME);
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sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS);
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device->driver_data = mem_device;
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/* Get the range from the _CRS */
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result = acpi_memory_get_device_resources(mem_device);
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if (result) {
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kfree(mem_device);
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return result;
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}
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/* Set the device state */
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mem_device->state = MEMORY_POWER_ON_STATE;
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pr_debug("%s\n", acpi_device_name(device));
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if (!acpi_memory_check_device(mem_device)) {
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/* call add_memory func */
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result = acpi_memory_enable_device(mem_device);
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if (result) {
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dev_err(&device->dev,
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"Error in acpi_memory_enable_device\n");
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acpi_memory_device_free(mem_device);
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}
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}
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return result;
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}
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static int acpi_memory_device_remove(struct acpi_device *device)
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{
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struct acpi_memory_device *mem_device = NULL;
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int result;
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if (!device || !acpi_driver_data(device))
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return -EINVAL;
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mem_device = acpi_driver_data(device);
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result = acpi_memory_remove_memory(mem_device);
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if (result)
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return result;
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acpi_memory_device_free(mem_device);
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return 0;
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}
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/*
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* Helper function to check for memory device
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*/
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static acpi_status is_memory_device(acpi_handle handle)
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{
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char *hardware_id;
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acpi_status status;
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struct acpi_device_info *info;
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status = acpi_get_object_info(handle, &info);
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if (ACPI_FAILURE(status))
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return status;
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if (!(info->valid & ACPI_VALID_HID)) {
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kfree(info);
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return AE_ERROR;
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}
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hardware_id = info->hardware_id.string;
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if ((hardware_id == NULL) ||
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(strcmp(hardware_id, ACPI_MEMORY_DEVICE_HID)))
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status = AE_ERROR;
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kfree(info);
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return status;
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}
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static acpi_status
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acpi_memory_register_notify_handler(acpi_handle handle,
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u32 level, void *ctxt, void **retv)
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{
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acpi_status status;
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status = is_memory_device(handle);
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if (ACPI_FAILURE(status))
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return AE_OK; /* continue */
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status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
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acpi_memory_device_notify, NULL);
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/* continue */
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return AE_OK;
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}
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static acpi_status
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acpi_memory_deregister_notify_handler(acpi_handle handle,
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u32 level, void *ctxt, void **retv)
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{
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acpi_status status;
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status = is_memory_device(handle);
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if (ACPI_FAILURE(status))
|
|
return AE_OK; /* continue */
|
|
|
|
status = acpi_remove_notify_handler(handle,
|
|
ACPI_SYSTEM_NOTIFY,
|
|
acpi_memory_device_notify);
|
|
|
|
return AE_OK; /* continue */
|
|
}
|
|
|
|
static int __init acpi_memory_device_init(void)
|
|
{
|
|
int result;
|
|
acpi_status status;
|
|
|
|
|
|
result = acpi_bus_register_driver(&acpi_memory_device_driver);
|
|
|
|
if (result < 0)
|
|
return -ENODEV;
|
|
|
|
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
|
|
ACPI_UINT32_MAX,
|
|
acpi_memory_register_notify_handler, NULL,
|
|
NULL, NULL);
|
|
|
|
if (ACPI_FAILURE(status)) {
|
|
ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed"));
|
|
acpi_bus_unregister_driver(&acpi_memory_device_driver);
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit acpi_memory_device_exit(void)
|
|
{
|
|
acpi_status status;
|
|
|
|
|
|
/*
|
|
* Adding this to un-install notification handlers for all the device
|
|
* handles.
|
|
*/
|
|
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
|
|
ACPI_UINT32_MAX,
|
|
acpi_memory_deregister_notify_handler, NULL,
|
|
NULL, NULL);
|
|
|
|
if (ACPI_FAILURE(status))
|
|
ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed"));
|
|
|
|
acpi_bus_unregister_driver(&acpi_memory_device_driver);
|
|
|
|
return;
|
|
}
|
|
|
|
module_init(acpi_memory_device_init);
|
|
module_exit(acpi_memory_device_exit);
|