Commit | Line | Data |
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1da177e4 | 1 | /* |
0a347644 RW |
2 | * Copyright (C) 2004, 2013 Intel Corporation |
3 | * Author: Naveen B S <naveen.b.s@intel.com> | |
4 | * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com> | |
1da177e4 LT |
5 | * |
6 | * All rights reserved. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or (at | |
11 | * your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
16 | * NON INFRINGEMENT. See the GNU General Public License for more | |
17 | * details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | * | |
23 | * | |
24 | * ACPI based HotPlug driver that supports Memory Hotplug | |
c7060d9e | 25 | * This driver fields notifications from firmware for memory add |
1da177e4 LT |
26 | * and remove operations and alerts the VM of the affected memory |
27 | * ranges. | |
28 | */ | |
29 | ||
ab6c5709 | 30 | #include <linux/acpi.h> |
0a347644 RW |
31 | #include <linux/memory_hotplug.h> |
32 | ||
33 | #include "internal.h" | |
1da177e4 | 34 | |
1da177e4 LT |
35 | #define ACPI_MEMORY_DEVICE_CLASS "memory" |
36 | #define ACPI_MEMORY_DEVICE_HID "PNP0C80" | |
1da177e4 LT |
37 | #define ACPI_MEMORY_DEVICE_NAME "Hotplug Mem Device" |
38 | ||
39 | #define _COMPONENT ACPI_MEMORY_DEVICE_COMPONENT | |
40 | ||
aa7b2b2e ZY |
41 | #undef PREFIX |
42 | #define PREFIX "ACPI:memory_hp:" | |
43 | ||
f52fd66d | 44 | ACPI_MODULE_NAME("acpi_memhotplug"); |
1da177e4 | 45 | |
1da177e4 LT |
46 | /* Memory Device States */ |
47 | #define MEMORY_INVALID_STATE 0 | |
48 | #define MEMORY_POWER_ON_STATE 1 | |
49 | #define MEMORY_POWER_OFF_STATE 2 | |
50 | ||
0a347644 RW |
51 | static int acpi_memory_device_add(struct acpi_device *device, |
52 | const struct acpi_device_id *not_used); | |
53 | static void acpi_memory_device_remove(struct acpi_device *device); | |
1da177e4 | 54 | |
1ba90e3a TR |
55 | static const struct acpi_device_id memory_device_ids[] = { |
56 | {ACPI_MEMORY_DEVICE_HID, 0}, | |
57 | {"", 0}, | |
58 | }; | |
1ba90e3a | 59 | |
0a347644 | 60 | static struct acpi_scan_handler memory_device_handler = { |
1ba90e3a | 61 | .ids = memory_device_ids, |
0a347644 RW |
62 | .attach = acpi_memory_device_add, |
63 | .detach = acpi_memory_device_remove, | |
64 | .hotplug = { | |
65 | .enabled = true, | |
66 | }, | |
1da177e4 LT |
67 | }; |
68 | ||
9ac02398 KH |
69 | struct acpi_memory_info { |
70 | struct list_head list; | |
71 | u64 start_addr; /* Memory Range start physical addr */ | |
72 | u64 length; /* Memory Range length */ | |
73 | unsigned short caching; /* memory cache attribute */ | |
74 | unsigned short write_protect; /* memory read/write attribute */ | |
75 | unsigned int enabled:1; | |
76 | }; | |
77 | ||
1da177e4 | 78 | struct acpi_memory_device { |
3b74863d | 79 | struct acpi_device * device; |
4be44fcd | 80 | unsigned int state; /* State of the memory device */ |
9ac02398 | 81 | struct list_head res_list; |
1da177e4 LT |
82 | }; |
83 | ||
9ac02398 KH |
84 | static acpi_status |
85 | acpi_memory_get_resource(struct acpi_resource *resource, void *context) | |
86 | { | |
87 | struct acpi_memory_device *mem_device = context; | |
88 | struct acpi_resource_address64 address64; | |
89 | struct acpi_memory_info *info, *new; | |
90 | acpi_status status; | |
91 | ||
92 | status = acpi_resource_to_address64(resource, &address64); | |
93 | if (ACPI_FAILURE(status) || | |
94 | (address64.resource_type != ACPI_MEMORY_RANGE)) | |
95 | return AE_OK; | |
96 | ||
97 | list_for_each_entry(info, &mem_device->res_list, list) { | |
98 | /* Can we combine the resource range information? */ | |
99 | if ((info->caching == address64.info.mem.caching) && | |
100 | (info->write_protect == address64.info.mem.write_protect) && | |
101 | (info->start_addr + info->length == address64.minimum)) { | |
102 | info->length += address64.address_length; | |
103 | return AE_OK; | |
104 | } | |
105 | } | |
106 | ||
107 | new = kzalloc(sizeof(struct acpi_memory_info), GFP_KERNEL); | |
108 | if (!new) | |
109 | return AE_ERROR; | |
110 | ||
111 | INIT_LIST_HEAD(&new->list); | |
112 | new->caching = address64.info.mem.caching; | |
113 | new->write_protect = address64.info.mem.write_protect; | |
114 | new->start_addr = address64.minimum; | |
115 | new->length = address64.address_length; | |
116 | list_add_tail(&new->list, &mem_device->res_list); | |
117 | ||
118 | return AE_OK; | |
119 | } | |
120 | ||
386e52b9 WC |
121 | static void |
122 | acpi_memory_free_device_resources(struct acpi_memory_device *mem_device) | |
123 | { | |
124 | struct acpi_memory_info *info, *n; | |
125 | ||
126 | list_for_each_entry_safe(info, n, &mem_device->res_list, list) | |
127 | kfree(info); | |
128 | INIT_LIST_HEAD(&mem_device->res_list); | |
129 | } | |
130 | ||
1da177e4 LT |
131 | static int |
132 | acpi_memory_get_device_resources(struct acpi_memory_device *mem_device) | |
133 | { | |
134 | acpi_status status; | |
1da177e4 | 135 | |
5d2870fa KH |
136 | if (!list_empty(&mem_device->res_list)) |
137 | return 0; | |
138 | ||
b8632785 | 139 | status = acpi_walk_resources(mem_device->device->handle, METHOD_NAME__CRS, |
9ac02398 KH |
140 | acpi_memory_get_resource, mem_device); |
141 | if (ACPI_FAILURE(status)) { | |
386e52b9 | 142 | acpi_memory_free_device_resources(mem_device); |
d550d98d | 143 | return -EINVAL; |
1da177e4 LT |
144 | } |
145 | ||
d550d98d | 146 | return 0; |
1da177e4 LT |
147 | } |
148 | ||
4be44fcd | 149 | static int acpi_memory_check_device(struct acpi_memory_device *mem_device) |
1da177e4 | 150 | { |
27663c58 | 151 | unsigned long long current_status; |
1da177e4 LT |
152 | |
153 | /* Get device present/absent information from the _STA */ | |
b8632785 | 154 | if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle, "_STA", |
4be44fcd | 155 | NULL, ¤t_status))) |
d550d98d | 156 | return -ENODEV; |
1da177e4 LT |
157 | /* |
158 | * Check for device status. Device should be | |
159 | * present/enabled/functioning. | |
160 | */ | |
a0bd4ac4 BH |
161 | if (!((current_status & ACPI_STA_DEVICE_PRESENT) |
162 | && (current_status & ACPI_STA_DEVICE_ENABLED) | |
163 | && (current_status & ACPI_STA_DEVICE_FUNCTIONING))) | |
d550d98d | 164 | return -ENODEV; |
1da177e4 | 165 | |
d550d98d | 166 | return 0; |
1da177e4 LT |
167 | } |
168 | ||
4be44fcd | 169 | static int acpi_memory_enable_device(struct acpi_memory_device *mem_device) |
1da177e4 | 170 | { |
9ac02398 KH |
171 | int result, num_enabled = 0; |
172 | struct acpi_memory_info *info; | |
1e3590e2 | 173 | int node; |
1da177e4 | 174 | |
b8632785 | 175 | node = acpi_get_node(mem_device->device->handle); |
1da177e4 LT |
176 | /* |
177 | * Tell the VM there is more memory here... | |
178 | * Note: Assume that this function returns zero on success | |
9ac02398 KH |
179 | * We don't have memory-hot-add rollback function,now. |
180 | * (i.e. memory-hot-remove function) | |
1da177e4 | 181 | */ |
9ac02398 | 182 | list_for_each_entry(info, &mem_device->res_list, list) { |
fa25d8d6 | 183 | if (info->enabled) { /* just sanity check...*/ |
dd56a8e3 YG |
184 | num_enabled++; |
185 | continue; | |
186 | } | |
5d2619fc ZY |
187 | /* |
188 | * If the memory block size is zero, please ignore it. | |
189 | * Don't try to do the following memory hotplug flowchart. | |
190 | */ | |
191 | if (!info->length) | |
192 | continue; | |
8c2676a5 KM |
193 | if (node < 0) |
194 | node = memory_add_physaddr_to_nid(info->start_addr); | |
195 | ||
bc02af93 | 196 | result = add_memory(node, info->start_addr, info->length); |
65479472 WC |
197 | |
198 | /* | |
199 | * If the memory block has been used by the kernel, add_memory() | |
200 | * returns -EEXIST. If add_memory() returns the other error, it | |
201 | * means that this memory block is not used by the kernel. | |
202 | */ | |
fd4655c2 | 203 | if (result && result != -EEXIST) |
9ac02398 | 204 | continue; |
65479472 | 205 | |
bb49d82d YI |
206 | info->enabled = 1; |
207 | ||
65479472 WC |
208 | /* |
209 | * Add num_enable even if add_memory() returns -EEXIST, so the | |
210 | * device is bound to this driver. | |
211 | */ | |
9ac02398 KH |
212 | num_enabled++; |
213 | } | |
214 | if (!num_enabled) { | |
ab6c5709 | 215 | dev_err(&mem_device->device->dev, "add_memory failed\n"); |
1da177e4 | 216 | mem_device->state = MEMORY_INVALID_STATE; |
9ac02398 | 217 | return -EINVAL; |
1da177e4 | 218 | } |
5d2619fc ZY |
219 | /* |
220 | * Sometimes the memory device will contain several memory blocks. | |
221 | * When one memory block is hot-added to the system memory, it will | |
222 | * be regarded as a success. | |
223 | * Otherwise if the last memory block can't be hot-added to the system | |
224 | * memory, it will be failure and the memory device can't be bound with | |
225 | * driver. | |
226 | */ | |
227 | return 0; | |
1da177e4 LT |
228 | } |
229 | ||
19387b27 | 230 | static int acpi_memory_remove_memory(struct acpi_memory_device *mem_device) |
1da177e4 | 231 | { |
60a5a19e | 232 | int result = 0, nid; |
9ac02398 | 233 | struct acpi_memory_info *info, *n; |
1da177e4 | 234 | |
60a5a19e TC |
235 | nid = acpi_get_node(mem_device->device->handle); |
236 | ||
9ac02398 | 237 | list_for_each_entry_safe(info, n, &mem_device->res_list, list) { |
65479472 | 238 | if (!info->enabled) |
fd4655c2 | 239 | continue; |
65479472 | 240 | |
60a5a19e TC |
241 | if (nid < 0) |
242 | nid = memory_add_physaddr_to_nid(info->start_addr); | |
243 | result = remove_memory(nid, info->start_addr, info->length); | |
65479472 WC |
244 | if (result) |
245 | return result; | |
19387b27 YI |
246 | |
247 | list_del(&info->list); | |
9ac02398 | 248 | kfree(info); |
1da177e4 LT |
249 | } |
250 | ||
65479472 | 251 | return result; |
19387b27 YI |
252 | } |
253 | ||
386e52b9 WC |
254 | static void acpi_memory_device_free(struct acpi_memory_device *mem_device) |
255 | { | |
256 | if (!mem_device) | |
257 | return; | |
258 | ||
259 | acpi_memory_free_device_resources(mem_device); | |
0a347644 | 260 | mem_device->device->driver_data = NULL; |
386e52b9 WC |
261 | kfree(mem_device); |
262 | } | |
263 | ||
0a347644 RW |
264 | static int acpi_memory_device_add(struct acpi_device *device, |
265 | const struct acpi_device_id *not_used) | |
1da177e4 | 266 | { |
0a347644 | 267 | struct acpi_memory_device *mem_device; |
1da177e4 | 268 | int result; |
1da177e4 LT |
269 | |
270 | if (!device) | |
d550d98d | 271 | return -EINVAL; |
1da177e4 | 272 | |
36bcbec7 | 273 | mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL); |
1da177e4 | 274 | if (!mem_device) |
d550d98d | 275 | return -ENOMEM; |
1da177e4 | 276 | |
9ac02398 | 277 | INIT_LIST_HEAD(&mem_device->res_list); |
3b74863d | 278 | mem_device->device = device; |
1da177e4 LT |
279 | sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME); |
280 | sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS); | |
db89b4f0 | 281 | device->driver_data = mem_device; |
1da177e4 LT |
282 | |
283 | /* Get the range from the _CRS */ | |
284 | result = acpi_memory_get_device_resources(mem_device); | |
285 | if (result) { | |
bf59e129 | 286 | device->driver_data = NULL; |
1da177e4 | 287 | kfree(mem_device); |
d550d98d | 288 | return result; |
1da177e4 LT |
289 | } |
290 | ||
291 | /* Set the device state */ | |
292 | mem_device->state = MEMORY_POWER_ON_STATE; | |
293 | ||
0a347644 RW |
294 | result = acpi_memory_check_device(mem_device); |
295 | if (result) { | |
296 | acpi_memory_device_free(mem_device); | |
297 | return 0; | |
298 | } | |
1da177e4 | 299 | |
0a347644 RW |
300 | result = acpi_memory_enable_device(mem_device); |
301 | if (result) { | |
302 | dev_err(&device->dev, "acpi_memory_enable_device() error\n"); | |
303 | acpi_memory_device_free(mem_device); | |
304 | return -ENODEV; | |
1f425994 | 305 | } |
0a347644 RW |
306 | |
307 | dev_dbg(&device->dev, "Memory device configured by ACPI\n"); | |
308 | return 1; | |
1f425994 YG |
309 | } |
310 | ||
0a347644 | 311 | static void acpi_memory_device_remove(struct acpi_device *device) |
80f20fef | 312 | { |
0a347644 | 313 | struct acpi_memory_device *mem_device; |
80f20fef BH |
314 | |
315 | if (!device || !acpi_driver_data(device)) | |
0a347644 | 316 | return; |
80f20fef BH |
317 | |
318 | mem_device = acpi_driver_data(device); | |
0a347644 | 319 | acpi_memory_remove_memory(mem_device); |
386e52b9 | 320 | acpi_memory_device_free(mem_device); |
1da177e4 LT |
321 | } |
322 | ||
0a347644 | 323 | void __init acpi_memory_hotplug_init(void) |
1da177e4 | 324 | { |
0a347644 | 325 | acpi_scan_add_handler_with_hotplug(&memory_device_handler, "memory"); |
1da177e4 | 326 | } |