blob: d98571385656154b8ef39664852e808397846a11 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (C) 2004 Intel Corporation <naveen.b.s@intel.com>
3 *
4 * All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
14 * NON INFRINGEMENT. See the GNU General Public License for more
15 * details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 *
21 *
22 * ACPI based HotPlug driver that supports Memory Hotplug
Nick Andrewc7060d92009-01-03 18:53:39 +110023 * This driver fields notifications from firmware for memory add
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 * and remove operations and alerts the VM of the affected memory
25 * ranges.
26 */
27
28#include <linux/kernel.h>
29#include <linux/module.h>
30#include <linux/init.h>
31#include <linux/types.h>
32#include <linux/memory_hotplug.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090033#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <acpi/acpi_drivers.h>
35
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#define ACPI_MEMORY_DEVICE_CLASS "memory"
37#define ACPI_MEMORY_DEVICE_HID "PNP0C80"
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#define ACPI_MEMORY_DEVICE_NAME "Hotplug Mem Device"
39
40#define _COMPONENT ACPI_MEMORY_DEVICE_COMPONENT
41
Zhao Yakuiaa7b2b22009-07-03 10:49:03 +080042#undef PREFIX
43#define PREFIX "ACPI:memory_hp:"
44
Len Brownf52fd662007-02-12 22:42:12 -050045ACPI_MODULE_NAME("acpi_memhotplug");
46MODULE_AUTHOR("Naveen B S <naveen.b.s@intel.com>");
Len Brown7cda93e2007-02-12 23:50:02 -050047MODULE_DESCRIPTION("Hotplug Mem Driver");
Linus Torvalds1da177e2005-04-16 15:20:36 -070048MODULE_LICENSE("GPL");
49
Linus Torvalds1da177e2005-04-16 15:20:36 -070050/* Memory Device States */
51#define MEMORY_INVALID_STATE 0
52#define MEMORY_POWER_ON_STATE 1
53#define MEMORY_POWER_OFF_STATE 2
54
Len Brown4be44fc2005-08-05 00:44:28 -040055static int acpi_memory_device_add(struct acpi_device *device);
56static int acpi_memory_device_remove(struct acpi_device *device, int type);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Thomas Renninger1ba90e32007-07-23 14:44:41 +020058static const struct acpi_device_id memory_device_ids[] = {
59 {ACPI_MEMORY_DEVICE_HID, 0},
60 {"", 0},
61};
62MODULE_DEVICE_TABLE(acpi, memory_device_ids);
63
Linus Torvalds1da177e2005-04-16 15:20:36 -070064static struct acpi_driver acpi_memory_device_driver = {
Len Brownc2b6705b2007-02-12 23:33:40 -050065 .name = "acpi_memhotplug",
Len Brown4be44fc2005-08-05 00:44:28 -040066 .class = ACPI_MEMORY_DEVICE_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +020067 .ids = memory_device_ids,
Len Brown4be44fc2005-08-05 00:44:28 -040068 .ops = {
69 .add = acpi_memory_device_add,
70 .remove = acpi_memory_device_remove,
71 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070072};
73
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -070074struct acpi_memory_info {
75 struct list_head list;
76 u64 start_addr; /* Memory Range start physical addr */
77 u64 length; /* Memory Range length */
78 unsigned short caching; /* memory cache attribute */
79 unsigned short write_protect; /* memory read/write attribute */
80 unsigned int enabled:1;
81};
82
Linus Torvalds1da177e2005-04-16 15:20:36 -070083struct acpi_memory_device {
Patrick Mochel3b748632006-05-19 16:54:38 -040084 struct acpi_device * device;
Len Brown4be44fc2005-08-05 00:44:28 -040085 unsigned int state; /* State of the memory device */
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -070086 struct list_head res_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087};
88
Yasunori Goto887b9592006-10-19 23:28:31 -070089static int acpi_hotmem_initialized;
90
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -070091static acpi_status
92acpi_memory_get_resource(struct acpi_resource *resource, void *context)
93{
94 struct acpi_memory_device *mem_device = context;
95 struct acpi_resource_address64 address64;
96 struct acpi_memory_info *info, *new;
97 acpi_status status;
98
99 status = acpi_resource_to_address64(resource, &address64);
100 if (ACPI_FAILURE(status) ||
101 (address64.resource_type != ACPI_MEMORY_RANGE))
102 return AE_OK;
103
104 list_for_each_entry(info, &mem_device->res_list, list) {
105 /* Can we combine the resource range information? */
106 if ((info->caching == address64.info.mem.caching) &&
107 (info->write_protect == address64.info.mem.write_protect) &&
108 (info->start_addr + info->length == address64.minimum)) {
109 info->length += address64.address_length;
110 return AE_OK;
111 }
112 }
113
114 new = kzalloc(sizeof(struct acpi_memory_info), GFP_KERNEL);
115 if (!new)
116 return AE_ERROR;
117
118 INIT_LIST_HEAD(&new->list);
119 new->caching = address64.info.mem.caching;
120 new->write_protect = address64.info.mem.write_protect;
121 new->start_addr = address64.minimum;
122 new->length = address64.address_length;
123 list_add_tail(&new->list, &mem_device->res_list);
124
125 return AE_OK;
126}
127
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128static int
129acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
130{
131 acpi_status status;
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -0700132 struct acpi_memory_info *info, *n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
KAMEZAWA Hiroyuki5d2870f2006-08-05 12:15:04 -0700135 if (!list_empty(&mem_device->res_list))
136 return 0;
137
Patrick Mochelb8632782006-05-19 16:54:41 -0400138 status = acpi_walk_resources(mem_device->device->handle, METHOD_NAME__CRS,
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -0700139 acpi_memory_get_resource, mem_device);
140 if (ACPI_FAILURE(status)) {
141 list_for_each_entry_safe(info, n, &mem_device->res_list, list)
142 kfree(info);
KAMEZAWA Hiroyuki5d2870f2006-08-05 12:15:04 -0700143 INIT_LIST_HEAD(&mem_device->res_list);
Patrick Mocheld550d982006-06-27 00:41:40 -0400144 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 }
146
Patrick Mocheld550d982006-06-27 00:41:40 -0400147 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148}
149
150static int
151acpi_memory_get_device(acpi_handle handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400152 struct acpi_memory_device **mem_device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153{
154 acpi_status status;
155 acpi_handle phandle;
156 struct acpi_device *device = NULL;
157 struct acpi_device *pdevice = NULL;
Zhao Yakuiaa7b2b22009-07-03 10:49:03 +0800158 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
161 if (!acpi_bus_get_device(handle, &device) && device)
162 goto end;
163
164 status = acpi_get_parent(handle, &phandle);
165 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400166 ACPI_EXCEPTION((AE_INFO, status, "Cannot find acpi parent"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400167 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 }
169
170 /* Get the parent device */
Zhao Yakuiaa7b2b22009-07-03 10:49:03 +0800171 result = acpi_bus_get_device(phandle, &pdevice);
172 if (result) {
173 printk(KERN_WARNING PREFIX "Cannot get acpi bus device");
Patrick Mocheld550d982006-06-27 00:41:40 -0400174 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 }
176
177 /*
178 * Now add the notified device. This creates the acpi_device
179 * and invokes .add function
180 */
Zhao Yakuiaa7b2b22009-07-03 10:49:03 +0800181 result = acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE);
182 if (result) {
183 printk(KERN_WARNING PREFIX "Cannot add acpi bus");
Patrick Mocheld550d982006-06-27 00:41:40 -0400184 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 }
186
Len Brown4be44fc2005-08-05 00:44:28 -0400187 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 *mem_device = acpi_driver_data(device);
189 if (!(*mem_device)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400190 printk(KERN_ERR "\n driver data not found");
Patrick Mocheld550d982006-06-27 00:41:40 -0400191 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 }
193
Patrick Mocheld550d982006-06-27 00:41:40 -0400194 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195}
196
Len Brown4be44fc2005-08-05 00:44:28 -0400197static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198{
Matthew Wilcox27663c52008-10-10 02:22:59 -0400199 unsigned long long current_status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
201 /* Get device present/absent information from the _STA */
Patrick Mochelb8632782006-05-19 16:54:41 -0400202 if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle, "_STA",
Len Brown4be44fc2005-08-05 00:44:28 -0400203 NULL, &current_status)))
Patrick Mocheld550d982006-06-27 00:41:40 -0400204 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 /*
206 * Check for device status. Device should be
207 * present/enabled/functioning.
208 */
Bjorn Helgaasa0bd4ac2007-04-25 14:17:39 -0400209 if (!((current_status & ACPI_STA_DEVICE_PRESENT)
210 && (current_status & ACPI_STA_DEVICE_ENABLED)
211 && (current_status & ACPI_STA_DEVICE_FUNCTIONING)))
Patrick Mocheld550d982006-06-27 00:41:40 -0400212 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
Patrick Mocheld550d982006-06-27 00:41:40 -0400214 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215}
216
Len Brown4be44fc2005-08-05 00:44:28 -0400217static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218{
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -0700219 int result, num_enabled = 0;
220 struct acpi_memory_info *info;
Yasunori Goto1e3590e2006-06-27 02:53:31 -0700221 int node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224 /* Get the range from the _CRS */
225 result = acpi_memory_get_device_resources(mem_device);
226 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400227 printk(KERN_ERR PREFIX "get_device_resources failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 mem_device->state = MEMORY_INVALID_STATE;
229 return result;
230 }
231
Patrick Mochelb8632782006-05-19 16:54:41 -0400232 node = acpi_get_node(mem_device->device->handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 /*
234 * Tell the VM there is more memory here...
235 * Note: Assume that this function returns zero on success
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -0700236 * We don't have memory-hot-add rollback function,now.
237 * (i.e. memory-hot-remove function)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 */
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -0700239 list_for_each_entry(info, &mem_device->res_list, list) {
KAMEZAWA Hiroyukifa25d8d2006-08-05 12:15:02 -0700240 if (info->enabled) { /* just sanity check...*/
Yasunori Gotodd56a8e2006-06-27 02:53:29 -0700241 num_enabled++;
242 continue;
243 }
Zhao Yakui5d2619f2009-07-07 10:56:11 +0800244 /*
245 * If the memory block size is zero, please ignore it.
246 * Don't try to do the following memory hotplug flowchart.
247 */
248 if (!info->length)
249 continue;
Keith Mannthey8c2676a2006-09-30 23:27:07 -0700250 if (node < 0)
251 node = memory_add_physaddr_to_nid(info->start_addr);
252
Yasunori Gotobc02af92006-06-27 02:53:30 -0700253 result = add_memory(node, info->start_addr, info->length);
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -0700254 if (result)
255 continue;
256 info->enabled = 1;
257 num_enabled++;
258 }
259 if (!num_enabled) {
akpm@osdl.org0a1f1ab2006-06-30 03:15:00 -0400260 printk(KERN_ERR PREFIX "add_memory failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 mem_device->state = MEMORY_INVALID_STATE;
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -0700262 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 }
Zhao Yakui5d2619f2009-07-07 10:56:11 +0800264 /*
265 * Sometimes the memory device will contain several memory blocks.
266 * When one memory block is hot-added to the system memory, it will
267 * be regarded as a success.
268 * Otherwise if the last memory block can't be hot-added to the system
269 * memory, it will be failure and the memory device can't be bound with
270 * driver.
271 */
272 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273}
274
Len Brown4be44fc2005-08-05 00:44:28 -0400275static int acpi_memory_powerdown_device(struct acpi_memory_device *mem_device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276{
277 acpi_status status;
Len Brown4be44fc2005-08-05 00:44:28 -0400278 struct acpi_object_list arg_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 union acpi_object arg;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400280 unsigned long long current_status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282
283 /* Issue the _EJ0 command */
284 arg_list.count = 1;
285 arg_list.pointer = &arg;
286 arg.type = ACPI_TYPE_INTEGER;
287 arg.integer.value = 1;
Patrick Mochelb8632782006-05-19 16:54:41 -0400288 status = acpi_evaluate_object(mem_device->device->handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400289 "_EJ0", &arg_list, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 /* Return on _EJ0 failure */
291 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400292 ACPI_EXCEPTION((AE_INFO, status, "_EJ0 failed"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400293 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 }
295
296 /* Evalute _STA to check if the device is disabled */
Patrick Mochelb8632782006-05-19 16:54:41 -0400297 status = acpi_evaluate_integer(mem_device->device->handle, "_STA",
Len Brown4be44fc2005-08-05 00:44:28 -0400298 NULL, &current_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400300 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
302 /* Check for device status. Device should be disabled */
Bjorn Helgaasa0bd4ac2007-04-25 14:17:39 -0400303 if (current_status & ACPI_STA_DEVICE_ENABLED)
Patrick Mocheld550d982006-06-27 00:41:40 -0400304 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
Patrick Mocheld550d982006-06-27 00:41:40 -0400306 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307}
308
Len Brown4be44fc2005-08-05 00:44:28 -0400309static int acpi_memory_disable_device(struct acpi_memory_device *mem_device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310{
311 int result;
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -0700312 struct acpi_memory_info *info, *n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
315 /*
316 * Ask the VM to offline this memory range.
317 * Note: Assume that this function returns zero on success
318 */
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -0700319 list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
320 if (info->enabled) {
321 result = remove_memory(info->start_addr, info->length);
322 if (result)
323 return result;
324 }
325 kfree(info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 }
327
328 /* Power-off and eject the device */
329 result = acpi_memory_powerdown_device(mem_device);
330 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 /* Set the status of the device to invalid */
332 mem_device->state = MEMORY_INVALID_STATE;
333 return result;
334 }
335
336 mem_device->state = MEMORY_POWER_OFF_STATE;
337 return result;
338}
339
Len Brown4be44fc2005-08-05 00:44:28 -0400340static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341{
342 struct acpi_memory_device *mem_device;
343 struct acpi_device *device;
344
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
346 switch (event) {
347 case ACPI_NOTIFY_BUS_CHECK:
348 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400349 "\nReceived BUS CHECK notification for device\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 /* Fall Through */
351 case ACPI_NOTIFY_DEVICE_CHECK:
352 if (event == ACPI_NOTIFY_DEVICE_CHECK)
353 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400354 "\nReceived DEVICE CHECK notification for device\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 if (acpi_memory_get_device(handle, &mem_device)) {
Len Brown64684632006-06-26 23:41:38 -0400356 printk(KERN_ERR PREFIX "Cannot find driver data\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400357 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 }
359
360 if (!acpi_memory_check_device(mem_device)) {
361 if (acpi_memory_enable_device(mem_device))
Len Brown64684632006-06-26 23:41:38 -0400362 printk(KERN_ERR PREFIX
363 "Cannot enable memory device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 }
365 break;
366 case ACPI_NOTIFY_EJECT_REQUEST:
367 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400368 "\nReceived EJECT REQUEST notification for device\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369
370 if (acpi_bus_get_device(handle, &device)) {
Len Brown64684632006-06-26 23:41:38 -0400371 printk(KERN_ERR PREFIX "Device doesn't exist\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 break;
373 }
374 mem_device = acpi_driver_data(device);
375 if (!mem_device) {
Len Brown64684632006-06-26 23:41:38 -0400376 printk(KERN_ERR PREFIX "Driver Data is NULL\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 break;
378 }
379
380 /*
381 * Currently disabling memory device from kernel mode
382 * TBD: Can also be disabled from user mode scripts
383 * TBD: Can also be disabled by Callback registration
Len Brown4be44fc2005-08-05 00:44:28 -0400384 * with generic sysfs driver
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 */
386 if (acpi_memory_disable_device(mem_device))
Len Brown64684632006-06-26 23:41:38 -0400387 printk(KERN_ERR PREFIX
388 "Disable memory device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 /*
390 * TBD: Invoke acpi_bus_remove to cleanup data structures
391 */
392 break;
393 default:
394 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400395 "Unsupported event [0x%x]\n", event));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 break;
397 }
398
Patrick Mocheld550d982006-06-27 00:41:40 -0400399 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400}
401
Len Brown4be44fc2005-08-05 00:44:28 -0400402static int acpi_memory_device_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403{
404 int result;
405 struct acpi_memory_device *mem_device = NULL;
406
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
408 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400409 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
Burman Yan36bcbec2006-12-19 12:56:11 -0800411 mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 if (!mem_device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400413 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -0700415 INIT_LIST_HEAD(&mem_device->res_list);
Patrick Mochel3b748632006-05-19 16:54:38 -0400416 mem_device->device = device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME);
418 sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700419 device->driver_data = mem_device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
421 /* Get the range from the _CRS */
422 result = acpi_memory_get_device_resources(mem_device);
423 if (result) {
424 kfree(mem_device);
Patrick Mocheld550d982006-06-27 00:41:40 -0400425 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 }
427
428 /* Set the device state */
429 mem_device->state = MEMORY_POWER_ON_STATE;
430
Yasunori Goto6cbe44c2006-10-19 23:28:30 -0700431 printk(KERN_DEBUG "%s \n", acpi_device_name(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
Bjorn Helgaas80f20fe2009-06-22 20:41:25 +0000433 /*
434 * Early boot code has recognized memory area by EFI/E820.
435 * If DSDT shows these memory devices on boot, hotplug is not necessary
436 * for them. So, it just returns until completion of this driver's
437 * start up.
438 */
439 if (!acpi_hotmem_initialized)
440 return 0;
441
442 if (!acpi_memory_check_device(mem_device)) {
443 /* call add_memory func */
444 result = acpi_memory_enable_device(mem_device);
445 if (result)
446 printk(KERN_ERR PREFIX
447 "Error in acpi_memory_enable_device\n");
448 }
Patrick Mocheld550d982006-06-27 00:41:40 -0400449 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450}
451
Len Brown4be44fc2005-08-05 00:44:28 -0400452static int acpi_memory_device_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453{
454 struct acpi_memory_device *mem_device = NULL;
455
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
457 if (!device || !acpi_driver_data(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400458 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200460 mem_device = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 kfree(mem_device);
462
Patrick Mocheld550d982006-06-27 00:41:40 -0400463 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464}
465
466/*
467 * Helper function to check for memory device
468 */
Len Brown4be44fc2005-08-05 00:44:28 -0400469static acpi_status is_memory_device(acpi_handle handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470{
471 char *hardware_id;
472 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 struct acpi_device_info *info;
474
Bob Moore15b8dd52009-06-29 13:39:29 +0800475 status = acpi_get_object_info(handle, &info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400477 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 if (!(info->valid & ACPI_VALID_HID)) {
Bob Moore15b8dd52009-06-29 13:39:29 +0800480 kfree(info);
Patrick Mocheld550d982006-06-27 00:41:40 -0400481 return AE_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 }
483
Bob Moore15b8dd52009-06-29 13:39:29 +0800484 hardware_id = info->hardware_id.string;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 if ((hardware_id == NULL) ||
Len Brown4be44fc2005-08-05 00:44:28 -0400486 (strcmp(hardware_id, ACPI_MEMORY_DEVICE_HID)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 status = AE_ERROR;
488
Bob Moore15b8dd52009-06-29 13:39:29 +0800489 kfree(info);
Patrick Mocheld550d982006-06-27 00:41:40 -0400490 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491}
492
493static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400494acpi_memory_register_notify_handler(acpi_handle handle,
495 u32 level, void *ctxt, void **retv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496{
497 acpi_status status;
498
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
500 status = is_memory_device(handle);
Yasunori Goto07dd4852006-08-14 22:37:32 -0700501 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400502 return AE_OK; /* continue */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503
Thomas Renningera6fc6722006-06-26 23:58:43 -0400504 status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
505 acpi_memory_device_notify, NULL);
506 /* continue */
Patrick Mocheld550d982006-06-27 00:41:40 -0400507 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508}
509
510static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400511acpi_memory_deregister_notify_handler(acpi_handle handle,
512 u32 level, void *ctxt, void **retv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513{
514 acpi_status status;
515
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516
517 status = is_memory_device(handle);
Yasunori Goto07dd4852006-08-14 22:37:32 -0700518 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400519 return AE_OK; /* continue */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520
521 status = acpi_remove_notify_handler(handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400522 ACPI_SYSTEM_NOTIFY,
523 acpi_memory_device_notify);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524
Patrick Mocheld550d982006-06-27 00:41:40 -0400525 return AE_OK; /* continue */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526}
527
Len Brown4be44fc2005-08-05 00:44:28 -0400528static int __init acpi_memory_device_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529{
530 int result;
531 acpi_status status;
532
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
534 result = acpi_bus_register_driver(&acpi_memory_device_driver);
535
536 if (result < 0)
Patrick Mocheld550d982006-06-27 00:41:40 -0400537 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
539 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
Len Brown4be44fc2005-08-05 00:44:28 -0400540 ACPI_UINT32_MAX,
Lin Ming22635762009-11-13 10:06:08 +0800541 acpi_memory_register_notify_handler, NULL,
Len Brown4be44fc2005-08-05 00:44:28 -0400542 NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543
Len Brown4be44fc2005-08-05 00:44:28 -0400544 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400545 ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 acpi_bus_unregister_driver(&acpi_memory_device_driver);
Patrick Mocheld550d982006-06-27 00:41:40 -0400547 return -ENODEV;
Len Brown4be44fc2005-08-05 00:44:28 -0400548 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
Yasunori Goto887b9592006-10-19 23:28:31 -0700550 acpi_hotmem_initialized = 1;
Patrick Mocheld550d982006-06-27 00:41:40 -0400551 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552}
553
Len Brown4be44fc2005-08-05 00:44:28 -0400554static void __exit acpi_memory_device_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555{
556 acpi_status status;
557
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
559 /*
560 * Adding this to un-install notification handlers for all the device
561 * handles.
562 */
563 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
Len Brown4be44fc2005-08-05 00:44:28 -0400564 ACPI_UINT32_MAX,
Lin Ming22635762009-11-13 10:06:08 +0800565 acpi_memory_deregister_notify_handler, NULL,
Len Brown4be44fc2005-08-05 00:44:28 -0400566 NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567
Len Brown4be44fc2005-08-05 00:44:28 -0400568 if (ACPI_FAILURE(status))
Thomas Renningera6fc6722006-06-26 23:58:43 -0400569 ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570
571 acpi_bus_unregister_driver(&acpi_memory_device_driver);
572
Patrick Mocheld550d982006-06-27 00:41:40 -0400573 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574}
575
576module_init(acpi_memory_device_init);
577module_exit(acpi_memory_device_exit);