![KAMEZAWA Hiroyuki](/assets/img/avatar_default.png)
drivers/acpi/acpi_memhotplug.c: In function `acpi_memory_get_device_resources': drivers/acpi/acpi_memhotplug.c:101: error: structure has no member named `attribute' drivers/acpi/acpi_memhotplug.c:103: error: structure has no member named `attribute' drivers/acpi/acpi_memhotplug.c: In function `acpi_memory_disable_device': drivers/acpi/acpi_memhotplug.c:253: warning: unused variable `attr' Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Len Brown <len.brown@intel.com>
525 lines
14 KiB
C
525 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 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 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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},
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};
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struct acpi_memory_device {
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acpi_handle handle;
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unsigned int state; /* State of the memory device */
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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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u64 start_addr; /* Memory Range start physical addr */
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u64 end_addr; /* Memory Range end physical addr */
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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_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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struct acpi_resource *resource = NULL;
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struct acpi_resource_address64 address64;
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ACPI_FUNCTION_TRACE("acpi_memory_get_device_resources");
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/* Get the range from the _CRS */
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status = acpi_get_current_resources(mem_device->handle, &buffer);
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if (ACPI_FAILURE(status))
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return_VALUE(-EINVAL);
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resource = (struct acpi_resource *)buffer.pointer;
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status = acpi_resource_to_address64(resource, &address64);
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if (ACPI_SUCCESS(status)) {
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if (address64.resource_type == ACPI_MEMORY_RANGE) {
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/* Populate the structure */
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mem_device->caching =
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address64.info.mem.caching;
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mem_device->write_protect =
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address64.info.mem.write_protect;
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mem_device->start_addr = address64.minimum;
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mem_device->end_addr = address64.maximum;
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}
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}
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acpi_os_free(buffer.pointer);
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return_VALUE(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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ACPI_FUNCTION_TRACE("acpi_memory_get_device");
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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_DEBUG_PRINT((ACPI_DB_ERROR, "Error in acpi_get_parent\n"));
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return_VALUE(-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_DEBUG_PRINT((ACPI_DB_ERROR,
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"Error in acpi_bus_get_device\n"));
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return_VALUE(-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_DEBUG_PRINT((ACPI_DB_ERROR, "Error in acpi_bus_add\n"));
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return_VALUE(-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_VALUE(-ENODEV);
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}
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return_VALUE(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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ACPI_FUNCTION_TRACE("acpi_memory_check_device");
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/* Get device present/absent information from the _STA */
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if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->handle, "_STA",
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NULL, ¤t_status)))
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return_VALUE(-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_VALUE(-ENODEV);
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return_VALUE(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;
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ACPI_FUNCTION_TRACE("acpi_memory_enable_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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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"\nget_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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/*
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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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*/
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result = add_memory(mem_device->start_addr,
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(mem_device->end_addr - mem_device->start_addr) + 1);
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if (result) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "\nadd_memory 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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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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ACPI_FUNCTION_TRACE("acpi_memory_powerdown_device");
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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->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_DEBUG_PRINT((ACPI_DB_ERROR, "_EJ0 failed.\n"));
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return_VALUE(-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->handle, "_STA",
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NULL, ¤t_status);
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if (ACPI_FAILURE(status))
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return_VALUE(-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_VALUE(-EINVAL);
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return_VALUE(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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u64 start = mem_device->start_addr;
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u64 len = mem_device->end_addr - start + 1;
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ACPI_FUNCTION_TRACE("acpi_memory_disable_device");
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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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result = remove_memory(start, len);
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if (result) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Hot-Remove failed.\n"));
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return_VALUE(result);
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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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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Device Power Down failed.\n"));
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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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ACPI_FUNCTION_TRACE("acpi_memory_device_notify");
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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_DEBUG_PRINT((ACPI_DB_ERROR,
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"Error in finding driver data\n"));
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return_VOID;
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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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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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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_DEBUG_PRINT((ACPI_DB_ERROR,
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"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_DEBUG_PRINT((ACPI_DB_ERROR,
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"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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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Error in acpi_memory_disable_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_VOID;
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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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ACPI_FUNCTION_TRACE("acpi_memory_device_add");
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if (!device)
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return_VALUE(-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_VALUE(-ENOMEM);
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memset(mem_device, 0, sizeof(struct acpi_memory_device));
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mem_device->handle = device->handle;
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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_VALUE(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_INFO "%s \n", acpi_device_name(device));
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return_VALUE(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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ACPI_FUNCTION_TRACE("acpi_memory_device_remove");
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if (!device || !acpi_driver_data(device))
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return_VALUE(-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_VALUE(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_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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struct acpi_device_info *info;
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ACPI_FUNCTION_TRACE("is_memory_device");
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status = acpi_get_object_info(handle, &buffer);
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if (ACPI_FAILURE(status))
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return_ACPI_STATUS(AE_ERROR);
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info = buffer.pointer;
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if (!(info->valid & ACPI_VALID_HID)) {
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acpi_os_free(buffer.pointer);
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return_ACPI_STATUS(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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acpi_os_free(buffer.pointer);
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return_ACPI_STATUS(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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ACPI_FUNCTION_TRACE("acpi_memory_register_notify_handler");
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status = is_memory_device(handle);
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if (ACPI_FAILURE(status))
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return_ACPI_STATUS(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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if (ACPI_FAILURE(status)) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Error installing notify handler\n"));
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return_ACPI_STATUS(AE_OK); /* continue */
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}
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return_ACPI_STATUS(status);
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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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ACPI_FUNCTION_TRACE("acpi_memory_deregister_notify_handler");
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status = is_memory_device(handle);
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if (ACPI_FAILURE(status))
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return_ACPI_STATUS(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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if (ACPI_FAILURE(status)) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Error removing notify handler\n"));
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return_ACPI_STATUS(AE_OK); /* continue */
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}
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return_ACPI_STATUS(status);
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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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ACPI_FUNCTION_TRACE("acpi_memory_device_init");
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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_VALUE(-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,
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NULL, NULL);
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if (ACPI_FAILURE(status)) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "walk_namespace failed\n"));
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acpi_bus_unregister_driver(&acpi_memory_device_driver);
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return_VALUE(-ENODEV);
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}
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return_VALUE(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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ACPI_FUNCTION_TRACE("acpi_memory_device_exit");
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|
|
/*
|
|
* 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_DEBUG_PRINT((ACPI_DB_ERROR, "walk_namespace failed\n"));
|
|
|
|
acpi_bus_unregister_driver(&acpi_memory_device_driver);
|
|
|
|
return_VOID;
|
|
}
|
|
|
|
module_init(acpi_memory_device_init);
|
|
module_exit(acpi_memory_device_exit);
|