![Rafael J. Wysocki](/assets/img/avatar_default.png)
The second argument of ACPI driver .remove() operation is only used by the ACPI processor driver and the value passed to that driver through it is always available from the given struct acpi_device object's removal_type field. For this reason, the second ACPI driver .remove() argument is in fact useless, so drop it. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Jiang Liu <jiang.liu@huawei.com> Acked-by: Toshi Kani <toshi.kani@hp.com> Acked-by: Yinghai Lu <yinghai@kernel.org>
548 lines
14 KiB
C
548 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
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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;
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if (!acpi_bus_get_device(handle, &device) && 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, "Cannot add acpi bus\n");
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return -EINVAL;
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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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return -EINVAL;
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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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return -ENODEV;
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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, "_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;
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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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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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result = remove_memory(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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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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if (acpi_bus_get_device(handle, &device)) {
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acpi_handle_err(handle, "Device doesn't exist\n");
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break;
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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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break;
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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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break;
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}
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ej_event->device = device;
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ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
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acpi_os_hotplug_execute(acpi_bus_hot_remove_device,
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(void *)ej_event);
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/* eject is performed asynchronously */
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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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return;
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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))
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return AE_OK; /* continue */
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status = acpi_remove_notify_handler(handle,
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ACPI_SYSTEM_NOTIFY,
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acpi_memory_device_notify);
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return AE_OK; /* continue */
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}
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static int __init acpi_memory_device_init(void)
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{
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int result;
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acpi_status status;
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result = acpi_bus_register_driver(&acpi_memory_device_driver);
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if (result < 0)
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return -ENODEV;
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
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ACPI_UINT32_MAX,
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acpi_memory_register_notify_handler, NULL,
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NULL, NULL);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed"));
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acpi_bus_unregister_driver(&acpi_memory_device_driver);
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return -ENODEV;
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}
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return 0;
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}
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static void __exit acpi_memory_device_exit(void)
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{
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acpi_status status;
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/*
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* Adding this to un-install notification handlers for all the device
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|
* 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);
|