579 lines
15 KiB
C
579 lines
15 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 firmare 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 <acpi/acpi_drivers.h>
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#define ACPI_MEMORY_DEVICE_COMPONENT 0x08000000UL
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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_DRIVER_NAME "Hotplug Mem Driver"
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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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ACPI_MODULE_NAME("acpi_memory")
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MODULE_AUTHOR("Naveen B S <naveen.b.s@intel.com>");
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MODULE_DESCRIPTION(ACPI_MEMORY_DEVICE_DRIVER_NAME);
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MODULE_LICENSE("GPL");
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/* ACPI _STA method values */
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#define ACPI_MEMORY_STA_PRESENT (0x00000001UL)
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#define ACPI_MEMORY_STA_ENABLED (0x00000002UL)
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#define ACPI_MEMORY_STA_FUNCTIONAL (0x00000008UL)
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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, int type);
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static int acpi_memory_device_start(struct acpi_device *device);
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static struct acpi_driver acpi_memory_device_driver = {
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.name = ACPI_MEMORY_DEVICE_DRIVER_NAME,
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.class = ACPI_MEMORY_DEVICE_CLASS,
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.ids = ACPI_MEMORY_DEVICE_HID,
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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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.start = acpi_memory_device_start,
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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 int acpi_hotmem_initialized;
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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 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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struct acpi_memory_info *info, *n;
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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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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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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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acpi_status status;
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acpi_handle phandle;
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struct acpi_device *device = NULL;
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struct acpi_device *pdevice = NULL;
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if (!acpi_bus_get_device(handle, &device) && device)
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goto end;
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status = acpi_get_parent(handle, &phandle);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status, "Cannot find acpi parent"));
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return -EINVAL;
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}
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/* Get the parent device */
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status = acpi_bus_get_device(phandle, &pdevice);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status, "Cannot get acpi bus device"));
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return -EINVAL;
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}
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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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status = acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status, "Cannot add acpi bus"));
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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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printk(KERN_ERR "\n driver data not found");
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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 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_MEMORY_STA_PRESENT)
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&& (current_status & ACPI_MEMORY_STA_ENABLED)
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&& (current_status & ACPI_MEMORY_STA_FUNCTIONAL)))
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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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/* 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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printk(KERN_ERR PREFIX "get_device_resources failed\n");
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mem_device->state = MEMORY_INVALID_STATE;
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return result;
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}
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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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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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if (result)
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continue;
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info->enabled = 1;
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num_enabled++;
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}
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if (!num_enabled) {
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printk(KERN_ERR PREFIX "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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return result;
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}
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static int acpi_memory_powerdown_device(struct acpi_memory_device *mem_device)
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{
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acpi_status status;
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struct acpi_object_list arg_list;
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union acpi_object arg;
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unsigned long current_status;
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/* Issue the _EJ0 command */
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arg_list.count = 1;
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arg_list.pointer = &arg;
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arg.type = ACPI_TYPE_INTEGER;
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arg.integer.value = 1;
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status = acpi_evaluate_object(mem_device->device->handle,
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"_EJ0", &arg_list, NULL);
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/* Return on _EJ0 failure */
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status, "_EJ0 failed"));
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return -ENODEV;
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}
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/* Evalute _STA to check if the device is disabled */
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status = acpi_evaluate_integer(mem_device->device->handle, "_STA",
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NULL, ¤t_status);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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/* Check for device status. Device should be disabled */
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if (current_status & ACPI_MEMORY_STA_ENABLED)
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return -EINVAL;
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return 0;
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}
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static int acpi_memory_disable_device(struct acpi_memory_device *mem_device)
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{
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int result;
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struct acpi_memory_info *info, *n;
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/*
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* Ask the VM to offline this memory range.
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* Note: Assume that this function returns zero on success
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*/
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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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result = remove_memory(info->start_addr, info->length);
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if (result)
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return result;
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}
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kfree(info);
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}
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/* Power-off and eject the device */
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result = acpi_memory_powerdown_device(mem_device);
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if (result) {
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/* Set the status of the device to invalid */
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mem_device->state = MEMORY_INVALID_STATE;
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return result;
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}
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mem_device->state = MEMORY_POWER_OFF_STATE;
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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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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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printk(KERN_ERR PREFIX "Cannot find driver data\n");
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return;
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}
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if (!acpi_memory_check_device(mem_device)) {
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if (acpi_memory_enable_device(mem_device))
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printk(KERN_ERR PREFIX
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"Cannot enable memory device\n");
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}
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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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printk(KERN_ERR PREFIX "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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printk(KERN_ERR PREFIX "Driver Data is NULL\n");
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break;
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}
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/*
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* Currently disabling memory device from kernel mode
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* TBD: Can also be disabled from user mode scripts
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* TBD: Can also be disabled by Callback registration
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* with generic sysfs driver
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*/
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if (acpi_memory_disable_device(mem_device))
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printk(KERN_ERR PREFIX
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"Disable memory device\n");
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/*
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* TBD: Invoke acpi_bus_remove to cleanup data structures
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*/
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break;
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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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break;
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}
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return;
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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 = kmalloc(sizeof(struct acpi_memory_device), GFP_KERNEL);
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if (!mem_device)
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return -ENOMEM;
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memset(mem_device, 0, sizeof(struct acpi_memory_device));
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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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acpi_driver_data(device) = 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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printk(KERN_DEBUG "%s \n", acpi_device_name(device));
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return result;
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}
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static int acpi_memory_device_remove(struct acpi_device *device, int type)
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{
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struct acpi_memory_device *mem_device = NULL;
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if (!device || !acpi_driver_data(device))
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return -EINVAL;
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mem_device = (struct acpi_memory_device *)acpi_driver_data(device);
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kfree(mem_device);
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return 0;
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}
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static int acpi_memory_device_start (struct acpi_device *device)
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{
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struct acpi_memory_device *mem_device;
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int result = 0;
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/*
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* Early boot code has recognized memory area by EFI/E820.
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* If DSDT shows these memory devices on boot, hotplug is not necessary
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* for them. So, it just returns until completion of this driver's
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* start up.
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*/
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if (!acpi_hotmem_initialized)
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return 0;
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mem_device = acpi_driver_data(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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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Error in acpi_memory_enable_device\n"));
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}
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return result;
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}
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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_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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struct acpi_device_info *info;
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status = acpi_get_object_info(handle, &buffer);
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if (ACPI_FAILURE(status))
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return status;
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info = buffer.pointer;
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if (!(info->valid & ACPI_VALID_HID)) {
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kfree(buffer.pointer);
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return AE_ERROR;
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}
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hardware_id = info->hardware_id.value;
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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(buffer.pointer);
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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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|
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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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|
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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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|
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return AE_OK; /* continue */
|
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}
|
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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);
|
|
|
|
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);
|
|
|
|
if (ACPI_FAILURE(status)) {
|
|
ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed"));
|
|
acpi_bus_unregister_driver(&acpi_memory_device_driver);
|
|
return -ENODEV;
|
|
}
|
|
|
|
acpi_hotmem_initialized = 1;
|
|
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);
|
|
|
|
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);
|