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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 | ||
283c0972 JP |
18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
19 | ||
ef92e7ca LJ |
20 | #include <linux/kernel.h> |
21 | #include <linux/module.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/types.h> | |
24 | #include <linux/acpi.h> | |
25 | #include <acpi/acpi_drivers.h> | |
26 | #include <xen/acpi.h> | |
27 | #include <xen/interface/platform.h> | |
28 | #include <asm/xen/hypercall.h> | |
29 | ||
30 | #define PREFIX "ACPI:xen_memory_hotplug:" | |
31 | ||
32 | struct acpi_memory_info { | |
33 | struct list_head list; | |
34 | u64 start_addr; /* Memory Range start physical addr */ | |
35 | u64 length; /* Memory Range length */ | |
36 | unsigned short caching; /* memory cache attribute */ | |
37 | unsigned short write_protect; /* memory read/write attribute */ | |
38 | /* copied from buffer getting from _CRS */ | |
39 | unsigned int enabled:1; | |
40 | }; | |
41 | ||
42 | struct acpi_memory_device { | |
43 | struct acpi_device *device; | |
44 | struct list_head res_list; | |
45 | }; | |
46 | ||
47 | static bool acpi_hotmem_initialized __read_mostly; | |
48 | ||
49 | static int xen_hotadd_memory(int pxm, struct acpi_memory_info *info) | |
50 | { | |
51 | int rc; | |
52 | struct xen_platform_op op; | |
53 | ||
54 | op.cmd = XENPF_mem_hotadd; | |
55 | op.u.mem_add.spfn = info->start_addr >> PAGE_SHIFT; | |
56 | op.u.mem_add.epfn = (info->start_addr + info->length) >> PAGE_SHIFT; | |
57 | op.u.mem_add.pxm = pxm; | |
58 | ||
59 | rc = HYPERVISOR_dom0_op(&op); | |
60 | if (rc) | |
61 | pr_err(PREFIX "Xen Hotplug Memory Add failed on " | |
62 | "0x%lx -> 0x%lx, _PXM: %d, error: %d\n", | |
63 | (unsigned long)info->start_addr, | |
64 | (unsigned long)(info->start_addr + info->length), | |
65 | pxm, rc); | |
66 | ||
67 | return rc; | |
68 | } | |
69 | ||
ef92e7ca LJ |
70 | static int xen_acpi_memory_enable_device(struct acpi_memory_device *mem_device) |
71 | { | |
72 | int pxm, result; | |
73 | int num_enabled = 0; | |
74 | struct acpi_memory_info *info; | |
75 | ||
76 | if (!mem_device) | |
77 | return -EINVAL; | |
78 | ||
79 | pxm = xen_acpi_get_pxm(mem_device->device->handle); | |
80 | if (pxm < 0) | |
81 | return pxm; | |
82 | ||
83 | list_for_each_entry(info, &mem_device->res_list, list) { | |
84 | if (info->enabled) { /* just sanity check...*/ | |
85 | num_enabled++; | |
86 | continue; | |
87 | } | |
88 | ||
89 | if (!info->length) | |
90 | continue; | |
91 | ||
92 | result = xen_hotadd_memory(pxm, info); | |
93 | if (result) | |
94 | continue; | |
95 | info->enabled = 1; | |
96 | num_enabled++; | |
97 | } | |
98 | ||
99 | if (!num_enabled) | |
100 | return -ENODEV; | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | static acpi_status | |
106 | acpi_memory_get_resource(struct acpi_resource *resource, void *context) | |
107 | { | |
108 | struct acpi_memory_device *mem_device = context; | |
109 | struct acpi_resource_address64 address64; | |
110 | struct acpi_memory_info *info, *new; | |
111 | acpi_status status; | |
112 | ||
113 | status = acpi_resource_to_address64(resource, &address64); | |
114 | if (ACPI_FAILURE(status) || | |
115 | (address64.resource_type != ACPI_MEMORY_RANGE)) | |
116 | return AE_OK; | |
117 | ||
118 | list_for_each_entry(info, &mem_device->res_list, list) { | |
119 | if ((info->caching == address64.info.mem.caching) && | |
120 | (info->write_protect == address64.info.mem.write_protect) && | |
121 | (info->start_addr + info->length == address64.minimum)) { | |
122 | info->length += address64.address_length; | |
123 | return AE_OK; | |
124 | } | |
125 | } | |
126 | ||
127 | new = kzalloc(sizeof(struct acpi_memory_info), GFP_KERNEL); | |
128 | if (!new) | |
129 | return AE_ERROR; | |
130 | ||
131 | INIT_LIST_HEAD(&new->list); | |
132 | new->caching = address64.info.mem.caching; | |
133 | new->write_protect = address64.info.mem.write_protect; | |
134 | new->start_addr = address64.minimum; | |
135 | new->length = address64.address_length; | |
136 | list_add_tail(&new->list, &mem_device->res_list); | |
137 | ||
138 | return AE_OK; | |
139 | } | |
140 | ||
141 | static int | |
142 | acpi_memory_get_device_resources(struct acpi_memory_device *mem_device) | |
143 | { | |
144 | acpi_status status; | |
145 | struct acpi_memory_info *info, *n; | |
146 | ||
147 | if (!list_empty(&mem_device->res_list)) | |
148 | return 0; | |
149 | ||
150 | status = acpi_walk_resources(mem_device->device->handle, | |
151 | METHOD_NAME__CRS, acpi_memory_get_resource, mem_device); | |
152 | ||
153 | if (ACPI_FAILURE(status)) { | |
154 | list_for_each_entry_safe(info, n, &mem_device->res_list, list) | |
155 | kfree(info); | |
156 | INIT_LIST_HEAD(&mem_device->res_list); | |
157 | return -EINVAL; | |
158 | } | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
484400ff LJ |
163 | static int acpi_memory_get_device(acpi_handle handle, |
164 | struct acpi_memory_device **mem_device) | |
ef92e7ca | 165 | { |
ef92e7ca | 166 | struct acpi_device *device = NULL; |
484400ff | 167 | int result = 0; |
ef92e7ca | 168 | |
484400ff | 169 | acpi_scan_lock_acquire(); |
ef92e7ca | 170 | |
484400ff LJ |
171 | acpi_bus_get_device(handle, &device); |
172 | if (device) | |
173 | goto end; | |
ef92e7ca LJ |
174 | |
175 | /* | |
176 | * Now add the notified device. This creates the acpi_device | |
177 | * and invokes .add function | |
178 | */ | |
77be36de | 179 | result = acpi_bus_scan(handle); |
ef92e7ca | 180 | if (result) { |
484400ff LJ |
181 | pr_warn(PREFIX "ACPI namespace scan failed\n"); |
182 | result = -EINVAL; | |
183 | goto out; | |
184 | } | |
185 | result = acpi_bus_get_device(handle, &device); | |
186 | if (result) { | |
187 | pr_warn(PREFIX "Missing device object\n"); | |
188 | result = -EINVAL; | |
189 | goto out; | |
ef92e7ca LJ |
190 | } |
191 | ||
192 | end: | |
193 | *mem_device = acpi_driver_data(device); | |
194 | if (!(*mem_device)) { | |
484400ff LJ |
195 | pr_err(PREFIX "driver data not found\n"); |
196 | result = -ENODEV; | |
197 | goto out; | |
ef92e7ca LJ |
198 | } |
199 | ||
484400ff LJ |
200 | out: |
201 | acpi_scan_lock_release(); | |
202 | return result; | |
ef92e7ca LJ |
203 | } |
204 | ||
205 | static int acpi_memory_check_device(struct acpi_memory_device *mem_device) | |
206 | { | |
207 | unsigned long long current_status; | |
208 | ||
209 | /* Get device present/absent information from the _STA */ | |
210 | if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle, | |
211 | "_STA", NULL, ¤t_status))) | |
212 | return -ENODEV; | |
213 | /* | |
214 | * Check for device status. Device should be | |
215 | * present/enabled/functioning. | |
216 | */ | |
217 | if (!((current_status & ACPI_STA_DEVICE_PRESENT) | |
218 | && (current_status & ACPI_STA_DEVICE_ENABLED) | |
219 | && (current_status & ACPI_STA_DEVICE_FUNCTIONING))) | |
220 | return -ENODEV; | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
225 | static int acpi_memory_disable_device(struct acpi_memory_device *mem_device) | |
226 | { | |
227 | pr_debug(PREFIX "Xen does not support memory hotremove\n"); | |
228 | ||
229 | return -ENOSYS; | |
230 | } | |
231 | ||
232 | static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data) | |
233 | { | |
234 | struct acpi_memory_device *mem_device; | |
235 | struct acpi_device *device; | |
236 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */ | |
237 | ||
238 | switch (event) { | |
239 | case ACPI_NOTIFY_BUS_CHECK: | |
240 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
241 | "\nReceived BUS CHECK notification for device\n")); | |
242 | /* Fall Through */ | |
243 | case ACPI_NOTIFY_DEVICE_CHECK: | |
244 | if (event == ACPI_NOTIFY_DEVICE_CHECK) | |
245 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
246 | "\nReceived DEVICE CHECK notification for device\n")); | |
247 | ||
248 | if (acpi_memory_get_device(handle, &mem_device)) { | |
249 | pr_err(PREFIX "Cannot find driver data\n"); | |
250 | break; | |
251 | } | |
252 | ||
253 | ost_code = ACPI_OST_SC_SUCCESS; | |
254 | break; | |
255 | ||
256 | case ACPI_NOTIFY_EJECT_REQUEST: | |
257 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
258 | "\nReceived EJECT REQUEST notification for device\n")); | |
259 | ||
484400ff | 260 | acpi_scan_lock_acquire(); |
ef92e7ca | 261 | if (acpi_bus_get_device(handle, &device)) { |
484400ff | 262 | acpi_scan_lock_release(); |
ef92e7ca LJ |
263 | pr_err(PREFIX "Device doesn't exist\n"); |
264 | break; | |
265 | } | |
266 | mem_device = acpi_driver_data(device); | |
267 | if (!mem_device) { | |
484400ff | 268 | acpi_scan_lock_release(); |
ef92e7ca LJ |
269 | pr_err(PREFIX "Driver Data is NULL\n"); |
270 | break; | |
271 | } | |
272 | ||
273 | /* | |
274 | * TBD: implement acpi_memory_disable_device and invoke | |
275 | * acpi_bus_remove if Xen support hotremove in the future | |
276 | */ | |
277 | acpi_memory_disable_device(mem_device); | |
484400ff | 278 | acpi_scan_lock_release(); |
ef92e7ca LJ |
279 | break; |
280 | ||
281 | default: | |
282 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
283 | "Unsupported event [0x%x]\n", event)); | |
284 | /* non-hotplug event; possibly handled by other handler */ | |
285 | return; | |
286 | } | |
287 | ||
288 | (void) acpi_evaluate_hotplug_ost(handle, event, ost_code, NULL); | |
289 | return; | |
290 | } | |
291 | ||
292 | static int xen_acpi_memory_device_add(struct acpi_device *device) | |
293 | { | |
294 | int result; | |
295 | struct acpi_memory_device *mem_device = NULL; | |
296 | ||
297 | ||
298 | if (!device) | |
299 | return -EINVAL; | |
300 | ||
301 | mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL); | |
302 | if (!mem_device) | |
303 | return -ENOMEM; | |
304 | ||
305 | INIT_LIST_HEAD(&mem_device->res_list); | |
306 | mem_device->device = device; | |
307 | sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME); | |
308 | sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS); | |
309 | device->driver_data = mem_device; | |
310 | ||
311 | /* Get the range from the _CRS */ | |
312 | result = acpi_memory_get_device_resources(mem_device); | |
313 | if (result) { | |
314 | kfree(mem_device); | |
315 | return result; | |
316 | } | |
317 | ||
318 | /* | |
319 | * For booting existed memory devices, early boot code has recognized | |
320 | * memory area by EFI/E820. If DSDT shows these memory devices on boot, | |
321 | * hotplug is not necessary for them. | |
322 | * For hot-added memory devices during runtime, it need hypercall to | |
323 | * Xen hypervisor to add memory. | |
324 | */ | |
325 | if (!acpi_hotmem_initialized) | |
326 | return 0; | |
327 | ||
328 | if (!acpi_memory_check_device(mem_device)) | |
329 | result = xen_acpi_memory_enable_device(mem_device); | |
330 | ||
331 | return result; | |
332 | } | |
333 | ||
77be36de | 334 | static int xen_acpi_memory_device_remove(struct acpi_device *device) |
ef92e7ca LJ |
335 | { |
336 | struct acpi_memory_device *mem_device = NULL; | |
337 | ||
338 | if (!device || !acpi_driver_data(device)) | |
339 | return -EINVAL; | |
340 | ||
341 | mem_device = acpi_driver_data(device); | |
342 | kfree(mem_device); | |
343 | ||
344 | return 0; | |
345 | } | |
346 | ||
347 | /* | |
348 | * Helper function to check for memory device | |
349 | */ | |
350 | static acpi_status is_memory_device(acpi_handle handle) | |
351 | { | |
352 | char *hardware_id; | |
353 | acpi_status status; | |
354 | struct acpi_device_info *info; | |
355 | ||
356 | status = acpi_get_object_info(handle, &info); | |
357 | if (ACPI_FAILURE(status)) | |
358 | return status; | |
359 | ||
360 | if (!(info->valid & ACPI_VALID_HID)) { | |
361 | kfree(info); | |
362 | return AE_ERROR; | |
363 | } | |
364 | ||
365 | hardware_id = info->hardware_id.string; | |
366 | if ((hardware_id == NULL) || | |
367 | (strcmp(hardware_id, ACPI_MEMORY_DEVICE_HID))) | |
368 | status = AE_ERROR; | |
369 | ||
370 | kfree(info); | |
371 | return status; | |
372 | } | |
373 | ||
374 | static acpi_status | |
375 | acpi_memory_register_notify_handler(acpi_handle handle, | |
376 | u32 level, void *ctxt, void **retv) | |
377 | { | |
378 | acpi_status status; | |
379 | ||
380 | status = is_memory_device(handle); | |
381 | if (ACPI_FAILURE(status)) | |
382 | return AE_OK; /* continue */ | |
383 | ||
384 | status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, | |
385 | acpi_memory_device_notify, NULL); | |
386 | /* continue */ | |
387 | return AE_OK; | |
388 | } | |
389 | ||
390 | static acpi_status | |
391 | acpi_memory_deregister_notify_handler(acpi_handle handle, | |
392 | u32 level, void *ctxt, void **retv) | |
393 | { | |
394 | acpi_status status; | |
395 | ||
396 | status = is_memory_device(handle); | |
397 | if (ACPI_FAILURE(status)) | |
398 | return AE_OK; /* continue */ | |
399 | ||
400 | status = acpi_remove_notify_handler(handle, | |
401 | ACPI_SYSTEM_NOTIFY, | |
402 | acpi_memory_device_notify); | |
403 | ||
404 | return AE_OK; /* continue */ | |
405 | } | |
406 | ||
407 | static const struct acpi_device_id memory_device_ids[] = { | |
408 | {ACPI_MEMORY_DEVICE_HID, 0}, | |
409 | {"", 0}, | |
410 | }; | |
411 | MODULE_DEVICE_TABLE(acpi, memory_device_ids); | |
412 | ||
413 | static struct acpi_driver xen_acpi_memory_device_driver = { | |
414 | .name = "acpi_memhotplug", | |
415 | .class = ACPI_MEMORY_DEVICE_CLASS, | |
416 | .ids = memory_device_ids, | |
417 | .ops = { | |
418 | .add = xen_acpi_memory_device_add, | |
419 | .remove = xen_acpi_memory_device_remove, | |
420 | }, | |
421 | }; | |
422 | ||
423 | static int __init xen_acpi_memory_device_init(void) | |
424 | { | |
425 | int result; | |
426 | acpi_status status; | |
427 | ||
428 | if (!xen_initial_domain()) | |
429 | return -ENODEV; | |
430 | ||
431 | /* unregister the stub which only used to reserve driver space */ | |
432 | xen_stub_memory_device_exit(); | |
433 | ||
434 | result = acpi_bus_register_driver(&xen_acpi_memory_device_driver); | |
435 | if (result < 0) { | |
436 | xen_stub_memory_device_init(); | |
437 | return -ENODEV; | |
438 | } | |
439 | ||
440 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
441 | ACPI_UINT32_MAX, | |
442 | acpi_memory_register_notify_handler, | |
443 | NULL, NULL, NULL); | |
444 | ||
445 | if (ACPI_FAILURE(status)) { | |
446 | pr_warn(PREFIX "walk_namespace failed\n"); | |
447 | acpi_bus_unregister_driver(&xen_acpi_memory_device_driver); | |
448 | xen_stub_memory_device_init(); | |
449 | return -ENODEV; | |
450 | } | |
451 | ||
452 | acpi_hotmem_initialized = true; | |
453 | return 0; | |
454 | } | |
455 | ||
456 | static void __exit xen_acpi_memory_device_exit(void) | |
457 | { | |
458 | acpi_status status; | |
459 | ||
460 | if (!xen_initial_domain()) | |
461 | return; | |
462 | ||
463 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
464 | ACPI_UINT32_MAX, | |
465 | acpi_memory_deregister_notify_handler, | |
466 | NULL, NULL, NULL); | |
467 | if (ACPI_FAILURE(status)) | |
468 | pr_warn(PREFIX "walk_namespace failed\n"); | |
469 | ||
470 | acpi_bus_unregister_driver(&xen_acpi_memory_device_driver); | |
471 | ||
472 | /* | |
473 | * stub reserve space again to prevent any chance of native | |
474 | * driver loading. | |
475 | */ | |
476 | xen_stub_memory_device_init(); | |
477 | return; | |
478 | } | |
479 | ||
480 | module_init(xen_acpi_memory_device_init); | |
481 | module_exit(xen_acpi_memory_device_exit); | |
482 | ACPI_MODULE_NAME("xen-acpi-memhotplug"); | |
483 | MODULE_AUTHOR("Liu Jinsong <jinsong.liu@intel.com>"); | |
484 | MODULE_DESCRIPTION("Xen Hotplug Mem Driver"); | |
485 | MODULE_LICENSE("GPL"); |