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ef92e7ca LJ |
1 | /* |
2 | * Copyright (C) 2012 Intel Corporation | |
3 | * Author: Liu Jinsong <jinsong.liu@intel.com> | |
4 | * Author: Jiang Yunhong <yunhong.jiang@intel.com> | |
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 | ||
18 | #include <linux/kernel.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/types.h> | |
22 | #include <linux/acpi.h> | |
23 | #include <acpi/acpi_drivers.h> | |
24 | #include <xen/acpi.h> | |
25 | #include <xen/interface/platform.h> | |
26 | #include <asm/xen/hypercall.h> | |
27 | ||
28 | #define PREFIX "ACPI:xen_memory_hotplug:" | |
29 | ||
30 | struct acpi_memory_info { | |
31 | struct list_head list; | |
32 | u64 start_addr; /* Memory Range start physical addr */ | |
33 | u64 length; /* Memory Range length */ | |
34 | unsigned short caching; /* memory cache attribute */ | |
35 | unsigned short write_protect; /* memory read/write attribute */ | |
36 | /* copied from buffer getting from _CRS */ | |
37 | unsigned int enabled:1; | |
38 | }; | |
39 | ||
40 | struct acpi_memory_device { | |
41 | struct acpi_device *device; | |
42 | struct list_head res_list; | |
43 | }; | |
44 | ||
45 | static bool acpi_hotmem_initialized __read_mostly; | |
46 | ||
47 | static int xen_hotadd_memory(int pxm, struct acpi_memory_info *info) | |
48 | { | |
49 | int rc; | |
50 | struct xen_platform_op op; | |
51 | ||
52 | op.cmd = XENPF_mem_hotadd; | |
53 | op.u.mem_add.spfn = info->start_addr >> PAGE_SHIFT; | |
54 | op.u.mem_add.epfn = (info->start_addr + info->length) >> PAGE_SHIFT; | |
55 | op.u.mem_add.pxm = pxm; | |
56 | ||
57 | rc = HYPERVISOR_dom0_op(&op); | |
58 | if (rc) | |
59 | pr_err(PREFIX "Xen Hotplug Memory Add failed on " | |
60 | "0x%lx -> 0x%lx, _PXM: %d, error: %d\n", | |
61 | (unsigned long)info->start_addr, | |
62 | (unsigned long)(info->start_addr + info->length), | |
63 | pxm, rc); | |
64 | ||
65 | return rc; | |
66 | } | |
67 | ||
ef92e7ca LJ |
68 | static int xen_acpi_memory_enable_device(struct acpi_memory_device *mem_device) |
69 | { | |
70 | int pxm, result; | |
71 | int num_enabled = 0; | |
72 | struct acpi_memory_info *info; | |
73 | ||
74 | if (!mem_device) | |
75 | return -EINVAL; | |
76 | ||
77 | pxm = xen_acpi_get_pxm(mem_device->device->handle); | |
78 | if (pxm < 0) | |
79 | return pxm; | |
80 | ||
81 | list_for_each_entry(info, &mem_device->res_list, list) { | |
82 | if (info->enabled) { /* just sanity check...*/ | |
83 | num_enabled++; | |
84 | continue; | |
85 | } | |
86 | ||
87 | if (!info->length) | |
88 | continue; | |
89 | ||
90 | result = xen_hotadd_memory(pxm, info); | |
91 | if (result) | |
92 | continue; | |
93 | info->enabled = 1; | |
94 | num_enabled++; | |
95 | } | |
96 | ||
97 | if (!num_enabled) | |
98 | return -ENODEV; | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | static acpi_status | |
104 | acpi_memory_get_resource(struct acpi_resource *resource, void *context) | |
105 | { | |
106 | struct acpi_memory_device *mem_device = context; | |
107 | struct acpi_resource_address64 address64; | |
108 | struct acpi_memory_info *info, *new; | |
109 | acpi_status status; | |
110 | ||
111 | status = acpi_resource_to_address64(resource, &address64); | |
112 | if (ACPI_FAILURE(status) || | |
113 | (address64.resource_type != ACPI_MEMORY_RANGE)) | |
114 | return AE_OK; | |
115 | ||
116 | list_for_each_entry(info, &mem_device->res_list, list) { | |
117 | if ((info->caching == address64.info.mem.caching) && | |
118 | (info->write_protect == address64.info.mem.write_protect) && | |
119 | (info->start_addr + info->length == address64.minimum)) { | |
120 | info->length += address64.address_length; | |
121 | return AE_OK; | |
122 | } | |
123 | } | |
124 | ||
125 | new = kzalloc(sizeof(struct acpi_memory_info), GFP_KERNEL); | |
126 | if (!new) | |
127 | return AE_ERROR; | |
128 | ||
129 | INIT_LIST_HEAD(&new->list); | |
130 | new->caching = address64.info.mem.caching; | |
131 | new->write_protect = address64.info.mem.write_protect; | |
132 | new->start_addr = address64.minimum; | |
133 | new->length = address64.address_length; | |
134 | list_add_tail(&new->list, &mem_device->res_list); | |
135 | ||
136 | return AE_OK; | |
137 | } | |
138 | ||
139 | static int | |
140 | acpi_memory_get_device_resources(struct acpi_memory_device *mem_device) | |
141 | { | |
142 | acpi_status status; | |
143 | struct acpi_memory_info *info, *n; | |
144 | ||
145 | if (!list_empty(&mem_device->res_list)) | |
146 | return 0; | |
147 | ||
148 | status = acpi_walk_resources(mem_device->device->handle, | |
149 | METHOD_NAME__CRS, acpi_memory_get_resource, mem_device); | |
150 | ||
151 | if (ACPI_FAILURE(status)) { | |
152 | list_for_each_entry_safe(info, n, &mem_device->res_list, list) | |
153 | kfree(info); | |
154 | INIT_LIST_HEAD(&mem_device->res_list); | |
155 | return -EINVAL; | |
156 | } | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
484400ff LJ |
161 | static int acpi_memory_get_device(acpi_handle handle, |
162 | struct acpi_memory_device **mem_device) | |
ef92e7ca | 163 | { |
ef92e7ca | 164 | struct acpi_device *device = NULL; |
484400ff | 165 | int result = 0; |
ef92e7ca | 166 | |
484400ff | 167 | acpi_scan_lock_acquire(); |
ef92e7ca | 168 | |
484400ff LJ |
169 | acpi_bus_get_device(handle, &device); |
170 | if (device) | |
171 | goto end; | |
ef92e7ca LJ |
172 | |
173 | /* | |
174 | * Now add the notified device. This creates the acpi_device | |
175 | * and invokes .add function | |
176 | */ | |
77be36de | 177 | result = acpi_bus_scan(handle); |
ef92e7ca | 178 | if (result) { |
484400ff LJ |
179 | pr_warn(PREFIX "ACPI namespace scan failed\n"); |
180 | result = -EINVAL; | |
181 | goto out; | |
182 | } | |
183 | result = acpi_bus_get_device(handle, &device); | |
184 | if (result) { | |
185 | pr_warn(PREFIX "Missing device object\n"); | |
186 | result = -EINVAL; | |
187 | goto out; | |
ef92e7ca LJ |
188 | } |
189 | ||
190 | end: | |
191 | *mem_device = acpi_driver_data(device); | |
192 | if (!(*mem_device)) { | |
484400ff LJ |
193 | pr_err(PREFIX "driver data not found\n"); |
194 | result = -ENODEV; | |
195 | goto out; | |
ef92e7ca LJ |
196 | } |
197 | ||
484400ff LJ |
198 | out: |
199 | acpi_scan_lock_release(); | |
200 | return result; | |
ef92e7ca LJ |
201 | } |
202 | ||
203 | static int acpi_memory_check_device(struct acpi_memory_device *mem_device) | |
204 | { | |
205 | unsigned long long current_status; | |
206 | ||
207 | /* Get device present/absent information from the _STA */ | |
208 | if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle, | |
209 | "_STA", NULL, ¤t_status))) | |
210 | return -ENODEV; | |
211 | /* | |
212 | * Check for device status. Device should be | |
213 | * present/enabled/functioning. | |
214 | */ | |
215 | if (!((current_status & ACPI_STA_DEVICE_PRESENT) | |
216 | && (current_status & ACPI_STA_DEVICE_ENABLED) | |
217 | && (current_status & ACPI_STA_DEVICE_FUNCTIONING))) | |
218 | return -ENODEV; | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
223 | static int acpi_memory_disable_device(struct acpi_memory_device *mem_device) | |
224 | { | |
225 | pr_debug(PREFIX "Xen does not support memory hotremove\n"); | |
226 | ||
227 | return -ENOSYS; | |
228 | } | |
229 | ||
230 | static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data) | |
231 | { | |
232 | struct acpi_memory_device *mem_device; | |
233 | struct acpi_device *device; | |
234 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */ | |
235 | ||
236 | switch (event) { | |
237 | case ACPI_NOTIFY_BUS_CHECK: | |
238 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
239 | "\nReceived BUS CHECK notification for device\n")); | |
240 | /* Fall Through */ | |
241 | case ACPI_NOTIFY_DEVICE_CHECK: | |
242 | if (event == ACPI_NOTIFY_DEVICE_CHECK) | |
243 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
244 | "\nReceived DEVICE CHECK notification for device\n")); | |
245 | ||
246 | if (acpi_memory_get_device(handle, &mem_device)) { | |
247 | pr_err(PREFIX "Cannot find driver data\n"); | |
248 | break; | |
249 | } | |
250 | ||
251 | ost_code = ACPI_OST_SC_SUCCESS; | |
252 | break; | |
253 | ||
254 | case ACPI_NOTIFY_EJECT_REQUEST: | |
255 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
256 | "\nReceived EJECT REQUEST notification for device\n")); | |
257 | ||
484400ff | 258 | acpi_scan_lock_acquire(); |
ef92e7ca | 259 | if (acpi_bus_get_device(handle, &device)) { |
484400ff | 260 | acpi_scan_lock_release(); |
ef92e7ca LJ |
261 | pr_err(PREFIX "Device doesn't exist\n"); |
262 | break; | |
263 | } | |
264 | mem_device = acpi_driver_data(device); | |
265 | if (!mem_device) { | |
484400ff | 266 | acpi_scan_lock_release(); |
ef92e7ca LJ |
267 | pr_err(PREFIX "Driver Data is NULL\n"); |
268 | break; | |
269 | } | |
270 | ||
271 | /* | |
272 | * TBD: implement acpi_memory_disable_device and invoke | |
273 | * acpi_bus_remove if Xen support hotremove in the future | |
274 | */ | |
275 | acpi_memory_disable_device(mem_device); | |
484400ff | 276 | acpi_scan_lock_release(); |
ef92e7ca LJ |
277 | break; |
278 | ||
279 | default: | |
280 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
281 | "Unsupported event [0x%x]\n", event)); | |
282 | /* non-hotplug event; possibly handled by other handler */ | |
283 | return; | |
284 | } | |
285 | ||
286 | (void) acpi_evaluate_hotplug_ost(handle, event, ost_code, NULL); | |
287 | return; | |
288 | } | |
289 | ||
290 | static int xen_acpi_memory_device_add(struct acpi_device *device) | |
291 | { | |
292 | int result; | |
293 | struct acpi_memory_device *mem_device = NULL; | |
294 | ||
295 | ||
296 | if (!device) | |
297 | return -EINVAL; | |
298 | ||
299 | mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL); | |
300 | if (!mem_device) | |
301 | return -ENOMEM; | |
302 | ||
303 | INIT_LIST_HEAD(&mem_device->res_list); | |
304 | mem_device->device = device; | |
305 | sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME); | |
306 | sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS); | |
307 | device->driver_data = mem_device; | |
308 | ||
309 | /* Get the range from the _CRS */ | |
310 | result = acpi_memory_get_device_resources(mem_device); | |
311 | if (result) { | |
312 | kfree(mem_device); | |
313 | return result; | |
314 | } | |
315 | ||
316 | /* | |
317 | * For booting existed memory devices, early boot code has recognized | |
318 | * memory area by EFI/E820. If DSDT shows these memory devices on boot, | |
319 | * hotplug is not necessary for them. | |
320 | * For hot-added memory devices during runtime, it need hypercall to | |
321 | * Xen hypervisor to add memory. | |
322 | */ | |
323 | if (!acpi_hotmem_initialized) | |
324 | return 0; | |
325 | ||
326 | if (!acpi_memory_check_device(mem_device)) | |
327 | result = xen_acpi_memory_enable_device(mem_device); | |
328 | ||
329 | return result; | |
330 | } | |
331 | ||
77be36de | 332 | static int xen_acpi_memory_device_remove(struct acpi_device *device) |
ef92e7ca LJ |
333 | { |
334 | struct acpi_memory_device *mem_device = NULL; | |
335 | ||
336 | if (!device || !acpi_driver_data(device)) | |
337 | return -EINVAL; | |
338 | ||
339 | mem_device = acpi_driver_data(device); | |
340 | kfree(mem_device); | |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
345 | /* | |
346 | * Helper function to check for memory device | |
347 | */ | |
348 | static acpi_status is_memory_device(acpi_handle handle) | |
349 | { | |
350 | char *hardware_id; | |
351 | acpi_status status; | |
352 | struct acpi_device_info *info; | |
353 | ||
354 | status = acpi_get_object_info(handle, &info); | |
355 | if (ACPI_FAILURE(status)) | |
356 | return status; | |
357 | ||
358 | if (!(info->valid & ACPI_VALID_HID)) { | |
359 | kfree(info); | |
360 | return AE_ERROR; | |
361 | } | |
362 | ||
363 | hardware_id = info->hardware_id.string; | |
364 | if ((hardware_id == NULL) || | |
365 | (strcmp(hardware_id, ACPI_MEMORY_DEVICE_HID))) | |
366 | status = AE_ERROR; | |
367 | ||
368 | kfree(info); | |
369 | return status; | |
370 | } | |
371 | ||
372 | static acpi_status | |
373 | acpi_memory_register_notify_handler(acpi_handle handle, | |
374 | u32 level, void *ctxt, void **retv) | |
375 | { | |
376 | acpi_status status; | |
377 | ||
378 | status = is_memory_device(handle); | |
379 | if (ACPI_FAILURE(status)) | |
380 | return AE_OK; /* continue */ | |
381 | ||
382 | status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, | |
383 | acpi_memory_device_notify, NULL); | |
384 | /* continue */ | |
385 | return AE_OK; | |
386 | } | |
387 | ||
388 | static acpi_status | |
389 | acpi_memory_deregister_notify_handler(acpi_handle handle, | |
390 | u32 level, void *ctxt, void **retv) | |
391 | { | |
392 | acpi_status status; | |
393 | ||
394 | status = is_memory_device(handle); | |
395 | if (ACPI_FAILURE(status)) | |
396 | return AE_OK; /* continue */ | |
397 | ||
398 | status = acpi_remove_notify_handler(handle, | |
399 | ACPI_SYSTEM_NOTIFY, | |
400 | acpi_memory_device_notify); | |
401 | ||
402 | return AE_OK; /* continue */ | |
403 | } | |
404 | ||
405 | static const struct acpi_device_id memory_device_ids[] = { | |
406 | {ACPI_MEMORY_DEVICE_HID, 0}, | |
407 | {"", 0}, | |
408 | }; | |
409 | MODULE_DEVICE_TABLE(acpi, memory_device_ids); | |
410 | ||
411 | static struct acpi_driver xen_acpi_memory_device_driver = { | |
412 | .name = "acpi_memhotplug", | |
413 | .class = ACPI_MEMORY_DEVICE_CLASS, | |
414 | .ids = memory_device_ids, | |
415 | .ops = { | |
416 | .add = xen_acpi_memory_device_add, | |
417 | .remove = xen_acpi_memory_device_remove, | |
418 | }, | |
419 | }; | |
420 | ||
421 | static int __init xen_acpi_memory_device_init(void) | |
422 | { | |
423 | int result; | |
424 | acpi_status status; | |
425 | ||
426 | if (!xen_initial_domain()) | |
427 | return -ENODEV; | |
428 | ||
429 | /* unregister the stub which only used to reserve driver space */ | |
430 | xen_stub_memory_device_exit(); | |
431 | ||
432 | result = acpi_bus_register_driver(&xen_acpi_memory_device_driver); | |
433 | if (result < 0) { | |
434 | xen_stub_memory_device_init(); | |
435 | return -ENODEV; | |
436 | } | |
437 | ||
438 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
439 | ACPI_UINT32_MAX, | |
440 | acpi_memory_register_notify_handler, | |
441 | NULL, NULL, NULL); | |
442 | ||
443 | if (ACPI_FAILURE(status)) { | |
444 | pr_warn(PREFIX "walk_namespace failed\n"); | |
445 | acpi_bus_unregister_driver(&xen_acpi_memory_device_driver); | |
446 | xen_stub_memory_device_init(); | |
447 | return -ENODEV; | |
448 | } | |
449 | ||
450 | acpi_hotmem_initialized = true; | |
451 | return 0; | |
452 | } | |
453 | ||
454 | static void __exit xen_acpi_memory_device_exit(void) | |
455 | { | |
456 | acpi_status status; | |
457 | ||
458 | if (!xen_initial_domain()) | |
459 | return; | |
460 | ||
461 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
462 | ACPI_UINT32_MAX, | |
463 | acpi_memory_deregister_notify_handler, | |
464 | NULL, NULL, NULL); | |
465 | if (ACPI_FAILURE(status)) | |
466 | pr_warn(PREFIX "walk_namespace failed\n"); | |
467 | ||
468 | acpi_bus_unregister_driver(&xen_acpi_memory_device_driver); | |
469 | ||
470 | /* | |
471 | * stub reserve space again to prevent any chance of native | |
472 | * driver loading. | |
473 | */ | |
474 | xen_stub_memory_device_init(); | |
475 | return; | |
476 | } | |
477 | ||
478 | module_init(xen_acpi_memory_device_init); | |
479 | module_exit(xen_acpi_memory_device_exit); | |
480 | ACPI_MODULE_NAME("xen-acpi-memhotplug"); | |
481 | MODULE_AUTHOR("Liu Jinsong <jinsong.liu@intel.com>"); | |
482 | MODULE_DESCRIPTION("Xen Hotplug Mem Driver"); | |
483 | MODULE_LICENSE("GPL"); |