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![Rafael J. Wysocki](/assets/img/avatar_default.png)
Prevent platform devices from being created for ACPI memory device objects if CONFIG_ACPI_HOTPLUG_MEMORY is unset by compiling out the memory hotplug scan handler's callbacks only in that case and still compiling its device ID list in and registering the scan handler in either case. Also unset the memory hotplug scan handler's .attach() callback if acpi_no_memhotplug is set, but still register the scan handler to avoid creating platform devices for ACPI memory devices in that case too. This change is based on a prototype from Zhang Rui. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
395 lines
10 KiB
C
395 lines
10 KiB
C
/*
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* Copyright (C) 2004, 2013 Intel Corporation
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* Author: Naveen B S <naveen.b.s@intel.com>
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* Author: Rafael J. Wysocki <rafael.j.wysocki@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/acpi.h>
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#include <linux/memory.h>
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#include <linux/memory_hotplug.h>
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#include "internal.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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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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#ifdef CONFIG_ACPI_HOTPLUG_MEMORY
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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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const struct acpi_device_id *not_used);
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static void acpi_memory_device_remove(struct acpi_device *device);
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static struct acpi_scan_handler memory_device_handler = {
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.ids = memory_device_ids,
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.attach = acpi_memory_device_add,
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.detach = acpi_memory_device_remove,
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.hotplug = {
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.enabled = true,
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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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};
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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_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,
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METHOD_NAME__STA, NULL,
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¤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 unsigned long acpi_meminfo_start_pfn(struct acpi_memory_info *info)
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{
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return PFN_DOWN(info->start_addr);
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}
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static unsigned long acpi_meminfo_end_pfn(struct acpi_memory_info *info)
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{
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return PFN_UP(info->start_addr + info->length-1);
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}
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static int acpi_bind_memblk(struct memory_block *mem, void *arg)
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{
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return acpi_bind_one(&mem->dev, arg);
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}
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static int acpi_bind_memory_blocks(struct acpi_memory_info *info,
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struct acpi_device *adev)
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{
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return walk_memory_range(acpi_meminfo_start_pfn(info),
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acpi_meminfo_end_pfn(info), adev,
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acpi_bind_memblk);
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}
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static int acpi_unbind_memblk(struct memory_block *mem, void *arg)
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{
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acpi_unbind_one(&mem->dev);
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return 0;
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}
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static void acpi_unbind_memory_blocks(struct acpi_memory_info *info)
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{
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walk_memory_range(acpi_meminfo_start_pfn(info),
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acpi_meminfo_end_pfn(info), NULL, acpi_unbind_memblk);
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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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acpi_handle handle = mem_device->device->handle;
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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(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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continue;
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result = acpi_bind_memory_blocks(info, mem_device->device);
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if (result) {
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acpi_unbind_memory_blocks(info);
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return -ENODEV;
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}
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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 void acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
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{
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acpi_handle handle = mem_device->device->handle;
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struct acpi_memory_info *info, *n;
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int nid = acpi_get_node(handle);
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list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
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if (!info->enabled)
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continue;
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if (nid == NUMA_NO_NODE)
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nid = memory_add_physaddr_to_nid(info->start_addr);
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acpi_unbind_memory_blocks(info);
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remove_memory(nid, info->start_addr, info->length);
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list_del(&info->list);
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kfree(info);
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}
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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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mem_device->device->driver_data = NULL;
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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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const struct acpi_device_id *not_used)
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{
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struct acpi_memory_device *mem_device;
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int result;
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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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device->driver_data = NULL;
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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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result = acpi_memory_check_device(mem_device);
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if (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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result = acpi_memory_enable_device(mem_device);
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if (result) {
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dev_err(&device->dev, "acpi_memory_enable_device() error\n");
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acpi_memory_device_free(mem_device);
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return result;
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}
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dev_dbg(&device->dev, "Memory device configured by ACPI\n");
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return 1;
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}
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static void acpi_memory_device_remove(struct acpi_device *device)
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{
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struct acpi_memory_device *mem_device;
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if (!device || !acpi_driver_data(device))
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return;
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mem_device = acpi_driver_data(device);
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acpi_memory_remove_memory(mem_device);
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acpi_memory_device_free(mem_device);
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}
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static bool __initdata acpi_no_memhotplug;
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void __init acpi_memory_hotplug_init(void)
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{
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if (acpi_no_memhotplug) {
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memory_device_handler.attach = NULL;
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acpi_scan_add_handler(&memory_device_handler);
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return;
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}
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acpi_scan_add_handler_with_hotplug(&memory_device_handler, "memory");
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}
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static int __init disable_acpi_memory_hotplug(char *str)
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{
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acpi_no_memhotplug = true;
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return 1;
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}
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__setup("acpi_no_memhotplug", disable_acpi_memory_hotplug);
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#else
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static struct acpi_scan_handler memory_device_handler = {
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.ids = memory_device_ids,
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};
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void __init acpi_memory_hotplug_init(void)
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{
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acpi_scan_add_handler(&memory_device_handler);
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}
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#endif /* CONFIG_ACPI_HOTPLUG_MEMORY */
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