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3b20eb23 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3e7ee490 | 2 | /* |
3e7ee490 HJ |
3 | * Copyright (c) 2009, Microsoft Corporation. |
4 | * | |
3e7ee490 HJ |
5 | * Authors: |
6 | * Haiyang Zhang <haiyangz@microsoft.com> | |
7 | * Hank Janssen <hjanssen@microsoft.com> | |
b0069f43 | 8 | * K. Y. Srinivasan <kys@microsoft.com> |
3e7ee490 | 9 | */ |
0a46618d HJ |
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
11 | ||
3e7ee490 HJ |
12 | #include <linux/init.h> |
13 | #include <linux/module.h> | |
14 | #include <linux/device.h> | |
3e7ee490 HJ |
15 | #include <linux/interrupt.h> |
16 | #include <linux/sysctl.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
b0069f43 | 18 | #include <linux/acpi.h> |
8b5d6d3b | 19 | #include <linux/completion.h> |
46a97191 | 20 | #include <linux/hyperv.h> |
b0209501 | 21 | #include <linux/kernel_stat.h> |
4061ed9e | 22 | #include <linux/clockchips.h> |
e513229b | 23 | #include <linux/cpu.h> |
68db0cf1 IM |
24 | #include <linux/sched/task_stack.h> |
25 | ||
302a3c0f | 26 | #include <asm/mshyperv.h> |
96c1d058 NM |
27 | #include <linux/notifier.h> |
28 | #include <linux/ptrace.h> | |
35464483 | 29 | #include <linux/screen_info.h> |
510f7aef | 30 | #include <linux/kdebug.h> |
6d146aef | 31 | #include <linux/efi.h> |
4b44f2d1 | 32 | #include <linux/random.h> |
0f2a6619 | 33 | #include "hyperv_vmbus.h" |
3e7ee490 | 34 | |
fc76936d SH |
35 | struct vmbus_dynid { |
36 | struct list_head node; | |
37 | struct hv_vmbus_device_id id; | |
38 | }; | |
39 | ||
607c1a11 | 40 | static struct acpi_device *hv_acpi_dev; |
1168ac22 | 41 | |
71a6655d | 42 | static struct completion probe_event; |
98db4335 | 43 | |
76d36ab7 | 44 | static int hyperv_cpuhp_online; |
96c1d058 | 45 | |
81b18bce SM |
46 | static void *hv_panic_page; |
47 | ||
510f7aef VK |
48 | static int hyperv_panic_event(struct notifier_block *nb, unsigned long val, |
49 | void *args) | |
50 | { | |
51 | struct pt_regs *regs; | |
52 | ||
53 | regs = current_pt_regs(); | |
54 | ||
7ed4325a | 55 | hyperv_report_panic(regs, val); |
96c1d058 NM |
56 | return NOTIFY_DONE; |
57 | } | |
58 | ||
510f7aef VK |
59 | static int hyperv_die_event(struct notifier_block *nb, unsigned long val, |
60 | void *args) | |
61 | { | |
62 | struct die_args *die = (struct die_args *)args; | |
63 | struct pt_regs *regs = die->regs; | |
64 | ||
7ed4325a | 65 | hyperv_report_panic(regs, val); |
510f7aef VK |
66 | return NOTIFY_DONE; |
67 | } | |
68 | ||
69 | static struct notifier_block hyperv_die_block = { | |
70 | .notifier_call = hyperv_die_event, | |
71 | }; | |
96c1d058 NM |
72 | static struct notifier_block hyperv_panic_block = { |
73 | .notifier_call = hyperv_panic_event, | |
74 | }; | |
75 | ||
6d146aef JO |
76 | static const char *fb_mmio_name = "fb_range"; |
77 | static struct resource *fb_mmio; | |
e2e80841 SH |
78 | static struct resource *hyperv_mmio; |
79 | static DEFINE_SEMAPHORE(hyperv_mmio_lock); | |
98db4335 | 80 | |
cf6a2eac S |
81 | static int vmbus_exists(void) |
82 | { | |
83 | if (hv_acpi_dev == NULL) | |
84 | return -ENODEV; | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
fd776ba9 OH |
89 | #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2) |
90 | static void print_alias_name(struct hv_device *hv_dev, char *alias_name) | |
91 | { | |
92 | int i; | |
93 | for (i = 0; i < VMBUS_ALIAS_LEN; i += 2) | |
94 | sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]); | |
95 | } | |
96 | ||
c2e5df61 | 97 | static u8 channel_monitor_group(const struct vmbus_channel *channel) |
76c52bbe GKH |
98 | { |
99 | return (u8)channel->offermsg.monitorid / 32; | |
100 | } | |
101 | ||
c2e5df61 | 102 | static u8 channel_monitor_offset(const struct vmbus_channel *channel) |
76c52bbe GKH |
103 | { |
104 | return (u8)channel->offermsg.monitorid % 32; | |
105 | } | |
106 | ||
c2e5df61 SH |
107 | static u32 channel_pending(const struct vmbus_channel *channel, |
108 | const struct hv_monitor_page *monitor_page) | |
76c52bbe GKH |
109 | { |
110 | u8 monitor_group = channel_monitor_group(channel); | |
c2e5df61 | 111 | |
76c52bbe GKH |
112 | return monitor_page->trigger_group[monitor_group].pending; |
113 | } | |
114 | ||
c2e5df61 SH |
115 | static u32 channel_latency(const struct vmbus_channel *channel, |
116 | const struct hv_monitor_page *monitor_page) | |
1cee272b GKH |
117 | { |
118 | u8 monitor_group = channel_monitor_group(channel); | |
119 | u8 monitor_offset = channel_monitor_offset(channel); | |
c2e5df61 | 120 | |
1cee272b GKH |
121 | return monitor_page->latency[monitor_group][monitor_offset]; |
122 | } | |
123 | ||
4947c745 GKH |
124 | static u32 channel_conn_id(struct vmbus_channel *channel, |
125 | struct hv_monitor_page *monitor_page) | |
126 | { | |
127 | u8 monitor_group = channel_monitor_group(channel); | |
128 | u8 monitor_offset = channel_monitor_offset(channel); | |
129 | return monitor_page->parameter[monitor_group][monitor_offset].connectionid.u.id; | |
130 | } | |
131 | ||
03f3a910 GKH |
132 | static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr, |
133 | char *buf) | |
134 | { | |
135 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
136 | ||
137 | if (!hv_dev->channel) | |
138 | return -ENODEV; | |
139 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid); | |
140 | } | |
141 | static DEVICE_ATTR_RO(id); | |
142 | ||
a8fb5f3d GKH |
143 | static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr, |
144 | char *buf) | |
145 | { | |
146 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
147 | ||
148 | if (!hv_dev->channel) | |
149 | return -ENODEV; | |
150 | return sprintf(buf, "%d\n", hv_dev->channel->state); | |
151 | } | |
152 | static DEVICE_ATTR_RO(state); | |
153 | ||
5ffd00e2 GKH |
154 | static ssize_t monitor_id_show(struct device *dev, |
155 | struct device_attribute *dev_attr, char *buf) | |
156 | { | |
157 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
158 | ||
159 | if (!hv_dev->channel) | |
160 | return -ENODEV; | |
161 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.monitorid); | |
162 | } | |
163 | static DEVICE_ATTR_RO(monitor_id); | |
164 | ||
68234c04 GKH |
165 | static ssize_t class_id_show(struct device *dev, |
166 | struct device_attribute *dev_attr, char *buf) | |
167 | { | |
168 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
169 | ||
170 | if (!hv_dev->channel) | |
171 | return -ENODEV; | |
172 | return sprintf(buf, "{%pUl}\n", | |
173 | hv_dev->channel->offermsg.offer.if_type.b); | |
174 | } | |
175 | static DEVICE_ATTR_RO(class_id); | |
176 | ||
7c55e1d0 GKH |
177 | static ssize_t device_id_show(struct device *dev, |
178 | struct device_attribute *dev_attr, char *buf) | |
179 | { | |
180 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
181 | ||
182 | if (!hv_dev->channel) | |
183 | return -ENODEV; | |
184 | return sprintf(buf, "{%pUl}\n", | |
185 | hv_dev->channel->offermsg.offer.if_instance.b); | |
186 | } | |
187 | static DEVICE_ATTR_RO(device_id); | |
188 | ||
647fa371 GKH |
189 | static ssize_t modalias_show(struct device *dev, |
190 | struct device_attribute *dev_attr, char *buf) | |
191 | { | |
192 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
193 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
194 | ||
195 | print_alias_name(hv_dev, alias_name); | |
196 | return sprintf(buf, "vmbus:%s\n", alias_name); | |
197 | } | |
198 | static DEVICE_ATTR_RO(modalias); | |
199 | ||
7ceb1c37 SH |
200 | #ifdef CONFIG_NUMA |
201 | static ssize_t numa_node_show(struct device *dev, | |
202 | struct device_attribute *attr, char *buf) | |
203 | { | |
204 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
205 | ||
206 | if (!hv_dev->channel) | |
207 | return -ENODEV; | |
208 | ||
209 | return sprintf(buf, "%d\n", hv_dev->channel->numa_node); | |
210 | } | |
211 | static DEVICE_ATTR_RO(numa_node); | |
212 | #endif | |
213 | ||
76c52bbe GKH |
214 | static ssize_t server_monitor_pending_show(struct device *dev, |
215 | struct device_attribute *dev_attr, | |
216 | char *buf) | |
217 | { | |
218 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
219 | ||
220 | if (!hv_dev->channel) | |
221 | return -ENODEV; | |
222 | return sprintf(buf, "%d\n", | |
223 | channel_pending(hv_dev->channel, | |
fd8e3c35 | 224 | vmbus_connection.monitor_pages[0])); |
76c52bbe GKH |
225 | } |
226 | static DEVICE_ATTR_RO(server_monitor_pending); | |
227 | ||
228 | static ssize_t client_monitor_pending_show(struct device *dev, | |
229 | struct device_attribute *dev_attr, | |
230 | char *buf) | |
231 | { | |
232 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
233 | ||
234 | if (!hv_dev->channel) | |
235 | return -ENODEV; | |
236 | return sprintf(buf, "%d\n", | |
237 | channel_pending(hv_dev->channel, | |
238 | vmbus_connection.monitor_pages[1])); | |
239 | } | |
240 | static DEVICE_ATTR_RO(client_monitor_pending); | |
68234c04 | 241 | |
1cee272b GKH |
242 | static ssize_t server_monitor_latency_show(struct device *dev, |
243 | struct device_attribute *dev_attr, | |
244 | char *buf) | |
245 | { | |
246 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
247 | ||
248 | if (!hv_dev->channel) | |
249 | return -ENODEV; | |
250 | return sprintf(buf, "%d\n", | |
251 | channel_latency(hv_dev->channel, | |
252 | vmbus_connection.monitor_pages[0])); | |
253 | } | |
254 | static DEVICE_ATTR_RO(server_monitor_latency); | |
255 | ||
256 | static ssize_t client_monitor_latency_show(struct device *dev, | |
257 | struct device_attribute *dev_attr, | |
258 | char *buf) | |
259 | { | |
260 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
261 | ||
262 | if (!hv_dev->channel) | |
263 | return -ENODEV; | |
264 | return sprintf(buf, "%d\n", | |
265 | channel_latency(hv_dev->channel, | |
266 | vmbus_connection.monitor_pages[1])); | |
267 | } | |
268 | static DEVICE_ATTR_RO(client_monitor_latency); | |
269 | ||
4947c745 GKH |
270 | static ssize_t server_monitor_conn_id_show(struct device *dev, |
271 | struct device_attribute *dev_attr, | |
272 | char *buf) | |
273 | { | |
274 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
275 | ||
276 | if (!hv_dev->channel) | |
277 | return -ENODEV; | |
278 | return sprintf(buf, "%d\n", | |
279 | channel_conn_id(hv_dev->channel, | |
280 | vmbus_connection.monitor_pages[0])); | |
281 | } | |
282 | static DEVICE_ATTR_RO(server_monitor_conn_id); | |
283 | ||
284 | static ssize_t client_monitor_conn_id_show(struct device *dev, | |
285 | struct device_attribute *dev_attr, | |
286 | char *buf) | |
287 | { | |
288 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
289 | ||
290 | if (!hv_dev->channel) | |
291 | return -ENODEV; | |
292 | return sprintf(buf, "%d\n", | |
293 | channel_conn_id(hv_dev->channel, | |
294 | vmbus_connection.monitor_pages[1])); | |
295 | } | |
296 | static DEVICE_ATTR_RO(client_monitor_conn_id); | |
297 | ||
98f4c651 GKH |
298 | static ssize_t out_intr_mask_show(struct device *dev, |
299 | struct device_attribute *dev_attr, char *buf) | |
300 | { | |
301 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
302 | struct hv_ring_buffer_debug_info outbound; | |
ba50bf1c | 303 | int ret; |
98f4c651 GKH |
304 | |
305 | if (!hv_dev->channel) | |
306 | return -ENODEV; | |
ba50bf1c DC |
307 | |
308 | ret = hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, | |
309 | &outbound); | |
310 | if (ret < 0) | |
311 | return ret; | |
312 | ||
98f4c651 GKH |
313 | return sprintf(buf, "%d\n", outbound.current_interrupt_mask); |
314 | } | |
315 | static DEVICE_ATTR_RO(out_intr_mask); | |
316 | ||
317 | static ssize_t out_read_index_show(struct device *dev, | |
318 | struct device_attribute *dev_attr, char *buf) | |
319 | { | |
320 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
321 | struct hv_ring_buffer_debug_info outbound; | |
ba50bf1c | 322 | int ret; |
98f4c651 GKH |
323 | |
324 | if (!hv_dev->channel) | |
325 | return -ENODEV; | |
ba50bf1c DC |
326 | |
327 | ret = hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, | |
328 | &outbound); | |
329 | if (ret < 0) | |
330 | return ret; | |
98f4c651 GKH |
331 | return sprintf(buf, "%d\n", outbound.current_read_index); |
332 | } | |
333 | static DEVICE_ATTR_RO(out_read_index); | |
334 | ||
335 | static ssize_t out_write_index_show(struct device *dev, | |
336 | struct device_attribute *dev_attr, | |
337 | char *buf) | |
338 | { | |
339 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
340 | struct hv_ring_buffer_debug_info outbound; | |
ba50bf1c | 341 | int ret; |
98f4c651 GKH |
342 | |
343 | if (!hv_dev->channel) | |
344 | return -ENODEV; | |
ba50bf1c DC |
345 | |
346 | ret = hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, | |
347 | &outbound); | |
348 | if (ret < 0) | |
349 | return ret; | |
98f4c651 GKH |
350 | return sprintf(buf, "%d\n", outbound.current_write_index); |
351 | } | |
352 | static DEVICE_ATTR_RO(out_write_index); | |
353 | ||
354 | static ssize_t out_read_bytes_avail_show(struct device *dev, | |
355 | struct device_attribute *dev_attr, | |
356 | char *buf) | |
357 | { | |
358 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
359 | struct hv_ring_buffer_debug_info outbound; | |
ba50bf1c | 360 | int ret; |
98f4c651 GKH |
361 | |
362 | if (!hv_dev->channel) | |
363 | return -ENODEV; | |
ba50bf1c DC |
364 | |
365 | ret = hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, | |
366 | &outbound); | |
367 | if (ret < 0) | |
368 | return ret; | |
98f4c651 GKH |
369 | return sprintf(buf, "%d\n", outbound.bytes_avail_toread); |
370 | } | |
371 | static DEVICE_ATTR_RO(out_read_bytes_avail); | |
372 | ||
373 | static ssize_t out_write_bytes_avail_show(struct device *dev, | |
374 | struct device_attribute *dev_attr, | |
375 | char *buf) | |
376 | { | |
377 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
378 | struct hv_ring_buffer_debug_info outbound; | |
ba50bf1c | 379 | int ret; |
98f4c651 GKH |
380 | |
381 | if (!hv_dev->channel) | |
382 | return -ENODEV; | |
ba50bf1c DC |
383 | |
384 | ret = hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, | |
385 | &outbound); | |
386 | if (ret < 0) | |
387 | return ret; | |
98f4c651 GKH |
388 | return sprintf(buf, "%d\n", outbound.bytes_avail_towrite); |
389 | } | |
390 | static DEVICE_ATTR_RO(out_write_bytes_avail); | |
391 | ||
392 | static ssize_t in_intr_mask_show(struct device *dev, | |
393 | struct device_attribute *dev_attr, char *buf) | |
394 | { | |
395 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
396 | struct hv_ring_buffer_debug_info inbound; | |
ba50bf1c | 397 | int ret; |
98f4c651 GKH |
398 | |
399 | if (!hv_dev->channel) | |
400 | return -ENODEV; | |
ba50bf1c DC |
401 | |
402 | ret = hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
403 | if (ret < 0) | |
404 | return ret; | |
405 | ||
98f4c651 GKH |
406 | return sprintf(buf, "%d\n", inbound.current_interrupt_mask); |
407 | } | |
408 | static DEVICE_ATTR_RO(in_intr_mask); | |
409 | ||
410 | static ssize_t in_read_index_show(struct device *dev, | |
411 | struct device_attribute *dev_attr, char *buf) | |
412 | { | |
413 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
414 | struct hv_ring_buffer_debug_info inbound; | |
ba50bf1c | 415 | int ret; |
98f4c651 GKH |
416 | |
417 | if (!hv_dev->channel) | |
418 | return -ENODEV; | |
ba50bf1c DC |
419 | |
420 | ret = hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
421 | if (ret < 0) | |
422 | return ret; | |
423 | ||
98f4c651 GKH |
424 | return sprintf(buf, "%d\n", inbound.current_read_index); |
425 | } | |
426 | static DEVICE_ATTR_RO(in_read_index); | |
427 | ||
428 | static ssize_t in_write_index_show(struct device *dev, | |
429 | struct device_attribute *dev_attr, char *buf) | |
430 | { | |
431 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
432 | struct hv_ring_buffer_debug_info inbound; | |
ba50bf1c | 433 | int ret; |
98f4c651 GKH |
434 | |
435 | if (!hv_dev->channel) | |
436 | return -ENODEV; | |
ba50bf1c DC |
437 | |
438 | ret = hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
439 | if (ret < 0) | |
440 | return ret; | |
441 | ||
98f4c651 GKH |
442 | return sprintf(buf, "%d\n", inbound.current_write_index); |
443 | } | |
444 | static DEVICE_ATTR_RO(in_write_index); | |
445 | ||
446 | static ssize_t in_read_bytes_avail_show(struct device *dev, | |
447 | struct device_attribute *dev_attr, | |
448 | char *buf) | |
449 | { | |
450 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
451 | struct hv_ring_buffer_debug_info inbound; | |
ba50bf1c | 452 | int ret; |
98f4c651 GKH |
453 | |
454 | if (!hv_dev->channel) | |
455 | return -ENODEV; | |
ba50bf1c DC |
456 | |
457 | ret = hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
458 | if (ret < 0) | |
459 | return ret; | |
460 | ||
98f4c651 GKH |
461 | return sprintf(buf, "%d\n", inbound.bytes_avail_toread); |
462 | } | |
463 | static DEVICE_ATTR_RO(in_read_bytes_avail); | |
464 | ||
465 | static ssize_t in_write_bytes_avail_show(struct device *dev, | |
466 | struct device_attribute *dev_attr, | |
467 | char *buf) | |
468 | { | |
469 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
470 | struct hv_ring_buffer_debug_info inbound; | |
ba50bf1c | 471 | int ret; |
98f4c651 GKH |
472 | |
473 | if (!hv_dev->channel) | |
474 | return -ENODEV; | |
ba50bf1c DC |
475 | |
476 | ret = hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
477 | if (ret < 0) | |
478 | return ret; | |
479 | ||
98f4c651 GKH |
480 | return sprintf(buf, "%d\n", inbound.bytes_avail_towrite); |
481 | } | |
482 | static DEVICE_ATTR_RO(in_write_bytes_avail); | |
483 | ||
042ab031 DC |
484 | static ssize_t channel_vp_mapping_show(struct device *dev, |
485 | struct device_attribute *dev_attr, | |
486 | char *buf) | |
487 | { | |
488 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
489 | struct vmbus_channel *channel = hv_dev->channel, *cur_sc; | |
490 | unsigned long flags; | |
491 | int buf_size = PAGE_SIZE, n_written, tot_written; | |
492 | struct list_head *cur; | |
493 | ||
494 | if (!channel) | |
495 | return -ENODEV; | |
496 | ||
497 | tot_written = snprintf(buf, buf_size, "%u:%u\n", | |
498 | channel->offermsg.child_relid, channel->target_cpu); | |
499 | ||
500 | spin_lock_irqsave(&channel->lock, flags); | |
501 | ||
502 | list_for_each(cur, &channel->sc_list) { | |
503 | if (tot_written >= buf_size - 1) | |
504 | break; | |
505 | ||
506 | cur_sc = list_entry(cur, struct vmbus_channel, sc_list); | |
507 | n_written = scnprintf(buf + tot_written, | |
508 | buf_size - tot_written, | |
509 | "%u:%u\n", | |
510 | cur_sc->offermsg.child_relid, | |
511 | cur_sc->target_cpu); | |
512 | tot_written += n_written; | |
513 | } | |
514 | ||
515 | spin_unlock_irqrestore(&channel->lock, flags); | |
516 | ||
517 | return tot_written; | |
518 | } | |
519 | static DEVICE_ATTR_RO(channel_vp_mapping); | |
520 | ||
7047f17d S |
521 | static ssize_t vendor_show(struct device *dev, |
522 | struct device_attribute *dev_attr, | |
523 | char *buf) | |
524 | { | |
525 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
526 | return sprintf(buf, "0x%x\n", hv_dev->vendor_id); | |
527 | } | |
528 | static DEVICE_ATTR_RO(vendor); | |
529 | ||
530 | static ssize_t device_show(struct device *dev, | |
531 | struct device_attribute *dev_attr, | |
532 | char *buf) | |
533 | { | |
534 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
535 | return sprintf(buf, "0x%x\n", hv_dev->device_id); | |
536 | } | |
537 | static DEVICE_ATTR_RO(device); | |
538 | ||
d765edbb SH |
539 | static ssize_t driver_override_store(struct device *dev, |
540 | struct device_attribute *attr, | |
541 | const char *buf, size_t count) | |
542 | { | |
543 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
544 | char *driver_override, *old, *cp; | |
545 | ||
546 | /* We need to keep extra room for a newline */ | |
547 | if (count >= (PAGE_SIZE - 1)) | |
548 | return -EINVAL; | |
549 | ||
550 | driver_override = kstrndup(buf, count, GFP_KERNEL); | |
551 | if (!driver_override) | |
552 | return -ENOMEM; | |
553 | ||
554 | cp = strchr(driver_override, '\n'); | |
555 | if (cp) | |
556 | *cp = '\0'; | |
557 | ||
558 | device_lock(dev); | |
559 | old = hv_dev->driver_override; | |
560 | if (strlen(driver_override)) { | |
561 | hv_dev->driver_override = driver_override; | |
562 | } else { | |
563 | kfree(driver_override); | |
564 | hv_dev->driver_override = NULL; | |
565 | } | |
566 | device_unlock(dev); | |
567 | ||
568 | kfree(old); | |
569 | ||
570 | return count; | |
571 | } | |
572 | ||
573 | static ssize_t driver_override_show(struct device *dev, | |
574 | struct device_attribute *attr, char *buf) | |
575 | { | |
576 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
577 | ssize_t len; | |
578 | ||
579 | device_lock(dev); | |
580 | len = snprintf(buf, PAGE_SIZE, "%s\n", hv_dev->driver_override); | |
581 | device_unlock(dev); | |
582 | ||
583 | return len; | |
584 | } | |
585 | static DEVICE_ATTR_RW(driver_override); | |
586 | ||
98f4c651 | 587 | /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ |
fc76936d | 588 | static struct attribute *vmbus_dev_attrs[] = { |
03f3a910 | 589 | &dev_attr_id.attr, |
a8fb5f3d | 590 | &dev_attr_state.attr, |
5ffd00e2 | 591 | &dev_attr_monitor_id.attr, |
68234c04 | 592 | &dev_attr_class_id.attr, |
7c55e1d0 | 593 | &dev_attr_device_id.attr, |
647fa371 | 594 | &dev_attr_modalias.attr, |
7ceb1c37 SH |
595 | #ifdef CONFIG_NUMA |
596 | &dev_attr_numa_node.attr, | |
597 | #endif | |
76c52bbe GKH |
598 | &dev_attr_server_monitor_pending.attr, |
599 | &dev_attr_client_monitor_pending.attr, | |
1cee272b GKH |
600 | &dev_attr_server_monitor_latency.attr, |
601 | &dev_attr_client_monitor_latency.attr, | |
4947c745 GKH |
602 | &dev_attr_server_monitor_conn_id.attr, |
603 | &dev_attr_client_monitor_conn_id.attr, | |
98f4c651 GKH |
604 | &dev_attr_out_intr_mask.attr, |
605 | &dev_attr_out_read_index.attr, | |
606 | &dev_attr_out_write_index.attr, | |
607 | &dev_attr_out_read_bytes_avail.attr, | |
608 | &dev_attr_out_write_bytes_avail.attr, | |
609 | &dev_attr_in_intr_mask.attr, | |
610 | &dev_attr_in_read_index.attr, | |
611 | &dev_attr_in_write_index.attr, | |
612 | &dev_attr_in_read_bytes_avail.attr, | |
613 | &dev_attr_in_write_bytes_avail.attr, | |
042ab031 | 614 | &dev_attr_channel_vp_mapping.attr, |
7047f17d S |
615 | &dev_attr_vendor.attr, |
616 | &dev_attr_device.attr, | |
d765edbb | 617 | &dev_attr_driver_override.attr, |
03f3a910 GKH |
618 | NULL, |
619 | }; | |
46fc1548 KB |
620 | |
621 | /* | |
622 | * Device-level attribute_group callback function. Returns the permission for | |
623 | * each attribute, and returns 0 if an attribute is not visible. | |
624 | */ | |
625 | static umode_t vmbus_dev_attr_is_visible(struct kobject *kobj, | |
626 | struct attribute *attr, int idx) | |
627 | { | |
628 | struct device *dev = kobj_to_dev(kobj); | |
629 | const struct hv_device *hv_dev = device_to_hv_device(dev); | |
630 | ||
631 | /* Hide the monitor attributes if the monitor mechanism is not used. */ | |
632 | if (!hv_dev->channel->offermsg.monitor_allocated && | |
633 | (attr == &dev_attr_monitor_id.attr || | |
634 | attr == &dev_attr_server_monitor_pending.attr || | |
635 | attr == &dev_attr_client_monitor_pending.attr || | |
636 | attr == &dev_attr_server_monitor_latency.attr || | |
637 | attr == &dev_attr_client_monitor_latency.attr || | |
638 | attr == &dev_attr_server_monitor_conn_id.attr || | |
639 | attr == &dev_attr_client_monitor_conn_id.attr)) | |
640 | return 0; | |
641 | ||
642 | return attr->mode; | |
643 | } | |
644 | ||
645 | static const struct attribute_group vmbus_dev_group = { | |
646 | .attrs = vmbus_dev_attrs, | |
647 | .is_visible = vmbus_dev_attr_is_visible | |
648 | }; | |
649 | __ATTRIBUTE_GROUPS(vmbus_dev); | |
03f3a910 | 650 | |
adde2487 S |
651 | /* |
652 | * vmbus_uevent - add uevent for our device | |
653 | * | |
654 | * This routine is invoked when a device is added or removed on the vmbus to | |
655 | * generate a uevent to udev in the userspace. The udev will then look at its | |
656 | * rule and the uevent generated here to load the appropriate driver | |
0ddda660 S |
657 | * |
658 | * The alias string will be of the form vmbus:guid where guid is the string | |
659 | * representation of the device guid (each byte of the guid will be | |
660 | * represented with two hex characters. | |
adde2487 S |
661 | */ |
662 | static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) | |
663 | { | |
664 | struct hv_device *dev = device_to_hv_device(device); | |
fd776ba9 OH |
665 | int ret; |
666 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
0ddda660 | 667 | |
fd776ba9 | 668 | print_alias_name(dev, alias_name); |
0ddda660 S |
669 | ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); |
670 | return ret; | |
adde2487 S |
671 | } |
672 | ||
d765edbb | 673 | static const struct hv_vmbus_device_id * |
593db803 | 674 | hv_vmbus_dev_match(const struct hv_vmbus_device_id *id, const guid_t *guid) |
d765edbb SH |
675 | { |
676 | if (id == NULL) | |
677 | return NULL; /* empty device table */ | |
678 | ||
593db803 AS |
679 | for (; !guid_is_null(&id->guid); id++) |
680 | if (guid_equal(&id->guid, guid)) | |
d765edbb SH |
681 | return id; |
682 | ||
683 | return NULL; | |
684 | } | |
685 | ||
686 | static const struct hv_vmbus_device_id * | |
593db803 | 687 | hv_vmbus_dynid_match(struct hv_driver *drv, const guid_t *guid) |
3037a7b6 | 688 | { |
fc76936d SH |
689 | const struct hv_vmbus_device_id *id = NULL; |
690 | struct vmbus_dynid *dynid; | |
691 | ||
fc76936d SH |
692 | spin_lock(&drv->dynids.lock); |
693 | list_for_each_entry(dynid, &drv->dynids.list, node) { | |
593db803 | 694 | if (guid_equal(&dynid->id.guid, guid)) { |
fc76936d SH |
695 | id = &dynid->id; |
696 | break; | |
697 | } | |
698 | } | |
699 | spin_unlock(&drv->dynids.lock); | |
700 | ||
d765edbb SH |
701 | return id; |
702 | } | |
fc76936d | 703 | |
593db803 | 704 | static const struct hv_vmbus_device_id vmbus_device_null; |
fc76936d | 705 | |
d765edbb SH |
706 | /* |
707 | * Return a matching hv_vmbus_device_id pointer. | |
708 | * If there is no match, return NULL. | |
709 | */ | |
710 | static const struct hv_vmbus_device_id *hv_vmbus_get_id(struct hv_driver *drv, | |
711 | struct hv_device *dev) | |
712 | { | |
593db803 | 713 | const guid_t *guid = &dev->dev_type; |
d765edbb | 714 | const struct hv_vmbus_device_id *id; |
3037a7b6 | 715 | |
d765edbb SH |
716 | /* When driver_override is set, only bind to the matching driver */ |
717 | if (dev->driver_override && strcmp(dev->driver_override, drv->name)) | |
718 | return NULL; | |
719 | ||
720 | /* Look at the dynamic ids first, before the static ones */ | |
721 | id = hv_vmbus_dynid_match(drv, guid); | |
722 | if (!id) | |
723 | id = hv_vmbus_dev_match(drv->id_table, guid); | |
724 | ||
725 | /* driver_override will always match, send a dummy id */ | |
726 | if (!id && dev->driver_override) | |
727 | id = &vmbus_device_null; | |
728 | ||
729 | return id; | |
3037a7b6 S |
730 | } |
731 | ||
fc76936d | 732 | /* vmbus_add_dynid - add a new device ID to this driver and re-probe devices */ |
593db803 | 733 | static int vmbus_add_dynid(struct hv_driver *drv, guid_t *guid) |
fc76936d SH |
734 | { |
735 | struct vmbus_dynid *dynid; | |
736 | ||
737 | dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); | |
738 | if (!dynid) | |
739 | return -ENOMEM; | |
740 | ||
741 | dynid->id.guid = *guid; | |
742 | ||
743 | spin_lock(&drv->dynids.lock); | |
744 | list_add_tail(&dynid->node, &drv->dynids.list); | |
745 | spin_unlock(&drv->dynids.lock); | |
746 | ||
747 | return driver_attach(&drv->driver); | |
748 | } | |
749 | ||
750 | static void vmbus_free_dynids(struct hv_driver *drv) | |
751 | { | |
752 | struct vmbus_dynid *dynid, *n; | |
753 | ||
754 | spin_lock(&drv->dynids.lock); | |
755 | list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) { | |
756 | list_del(&dynid->node); | |
757 | kfree(dynid); | |
758 | } | |
759 | spin_unlock(&drv->dynids.lock); | |
760 | } | |
761 | ||
fc76936d SH |
762 | /* |
763 | * store_new_id - sysfs frontend to vmbus_add_dynid() | |
764 | * | |
765 | * Allow GUIDs to be added to an existing driver via sysfs. | |
766 | */ | |
767 | static ssize_t new_id_store(struct device_driver *driver, const char *buf, | |
768 | size_t count) | |
769 | { | |
770 | struct hv_driver *drv = drv_to_hv_drv(driver); | |
593db803 | 771 | guid_t guid; |
fc76936d SH |
772 | ssize_t retval; |
773 | ||
593db803 | 774 | retval = guid_parse(buf, &guid); |
31100108 AS |
775 | if (retval) |
776 | return retval; | |
fc76936d | 777 | |
d765edbb | 778 | if (hv_vmbus_dynid_match(drv, &guid)) |
fc76936d SH |
779 | return -EEXIST; |
780 | ||
781 | retval = vmbus_add_dynid(drv, &guid); | |
782 | if (retval) | |
783 | return retval; | |
784 | return count; | |
785 | } | |
786 | static DRIVER_ATTR_WO(new_id); | |
787 | ||
788 | /* | |
789 | * store_remove_id - remove a PCI device ID from this driver | |
790 | * | |
791 | * Removes a dynamic pci device ID to this driver. | |
792 | */ | |
793 | static ssize_t remove_id_store(struct device_driver *driver, const char *buf, | |
794 | size_t count) | |
795 | { | |
796 | struct hv_driver *drv = drv_to_hv_drv(driver); | |
797 | struct vmbus_dynid *dynid, *n; | |
593db803 | 798 | guid_t guid; |
31100108 | 799 | ssize_t retval; |
fc76936d | 800 | |
593db803 | 801 | retval = guid_parse(buf, &guid); |
31100108 AS |
802 | if (retval) |
803 | return retval; | |
fc76936d | 804 | |
31100108 | 805 | retval = -ENODEV; |
fc76936d SH |
806 | spin_lock(&drv->dynids.lock); |
807 | list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) { | |
808 | struct hv_vmbus_device_id *id = &dynid->id; | |
809 | ||
593db803 | 810 | if (guid_equal(&id->guid, &guid)) { |
fc76936d SH |
811 | list_del(&dynid->node); |
812 | kfree(dynid); | |
813 | retval = count; | |
814 | break; | |
815 | } | |
816 | } | |
817 | spin_unlock(&drv->dynids.lock); | |
818 | ||
819 | return retval; | |
820 | } | |
821 | static DRIVER_ATTR_WO(remove_id); | |
822 | ||
823 | static struct attribute *vmbus_drv_attrs[] = { | |
824 | &driver_attr_new_id.attr, | |
825 | &driver_attr_remove_id.attr, | |
826 | NULL, | |
827 | }; | |
828 | ATTRIBUTE_GROUPS(vmbus_drv); | |
3037a7b6 | 829 | |
b7fc147b S |
830 | |
831 | /* | |
832 | * vmbus_match - Attempt to match the specified device to the specified driver | |
833 | */ | |
834 | static int vmbus_match(struct device *device, struct device_driver *driver) | |
835 | { | |
b7fc147b | 836 | struct hv_driver *drv = drv_to_hv_drv(driver); |
e8e27047 | 837 | struct hv_device *hv_dev = device_to_hv_device(device); |
b7fc147b | 838 | |
8981da32 DC |
839 | /* The hv_sock driver handles all hv_sock offers. */ |
840 | if (is_hvsock_channel(hv_dev->channel)) | |
841 | return drv->hvsock; | |
842 | ||
d765edbb | 843 | if (hv_vmbus_get_id(drv, hv_dev)) |
3037a7b6 | 844 | return 1; |
de632a2b | 845 | |
5841a829 | 846 | return 0; |
b7fc147b S |
847 | } |
848 | ||
f1f0d67b S |
849 | /* |
850 | * vmbus_probe - Add the new vmbus's child device | |
851 | */ | |
852 | static int vmbus_probe(struct device *child_device) | |
853 | { | |
854 | int ret = 0; | |
855 | struct hv_driver *drv = | |
856 | drv_to_hv_drv(child_device->driver); | |
9efd21e1 | 857 | struct hv_device *dev = device_to_hv_device(child_device); |
84946899 | 858 | const struct hv_vmbus_device_id *dev_id; |
f1f0d67b | 859 | |
d765edbb | 860 | dev_id = hv_vmbus_get_id(drv, dev); |
9efd21e1 | 861 | if (drv->probe) { |
84946899 | 862 | ret = drv->probe(dev, dev_id); |
b14a7b30 | 863 | if (ret != 0) |
0a46618d HJ |
864 | pr_err("probe failed for device %s (%d)\n", |
865 | dev_name(child_device), ret); | |
f1f0d67b | 866 | |
f1f0d67b | 867 | } else { |
0a46618d HJ |
868 | pr_err("probe not set for driver %s\n", |
869 | dev_name(child_device)); | |
6de925b1 | 870 | ret = -ENODEV; |
f1f0d67b S |
871 | } |
872 | return ret; | |
873 | } | |
874 | ||
c5dce3db S |
875 | /* |
876 | * vmbus_remove - Remove a vmbus device | |
877 | */ | |
878 | static int vmbus_remove(struct device *child_device) | |
879 | { | |
d15a0301 | 880 | struct hv_driver *drv; |
415b023a | 881 | struct hv_device *dev = device_to_hv_device(child_device); |
c5dce3db | 882 | |
d15a0301 S |
883 | if (child_device->driver) { |
884 | drv = drv_to_hv_drv(child_device->driver); | |
885 | if (drv->remove) | |
886 | drv->remove(dev); | |
d15a0301 | 887 | } |
c5dce3db S |
888 | |
889 | return 0; | |
890 | } | |
891 | ||
eb1bb259 S |
892 | |
893 | /* | |
894 | * vmbus_shutdown - Shutdown a vmbus device | |
895 | */ | |
896 | static void vmbus_shutdown(struct device *child_device) | |
897 | { | |
898 | struct hv_driver *drv; | |
ca6887fb | 899 | struct hv_device *dev = device_to_hv_device(child_device); |
eb1bb259 S |
900 | |
901 | ||
902 | /* The device may not be attached yet */ | |
903 | if (!child_device->driver) | |
904 | return; | |
905 | ||
906 | drv = drv_to_hv_drv(child_device->driver); | |
907 | ||
ca6887fb S |
908 | if (drv->shutdown) |
909 | drv->shutdown(dev); | |
eb1bb259 S |
910 | } |
911 | ||
086e7a56 S |
912 | |
913 | /* | |
914 | * vmbus_device_release - Final callback release of the vmbus child device | |
915 | */ | |
916 | static void vmbus_device_release(struct device *device) | |
917 | { | |
e8e27047 | 918 | struct hv_device *hv_dev = device_to_hv_device(device); |
34c6801e | 919 | struct vmbus_channel *channel = hv_dev->channel; |
086e7a56 | 920 | |
54a66265 | 921 | mutex_lock(&vmbus_connection.channel_mutex); |
800b9329 | 922 | hv_process_channel_removal(channel); |
54a66265 | 923 | mutex_unlock(&vmbus_connection.channel_mutex); |
e8e27047 | 924 | kfree(hv_dev); |
086e7a56 S |
925 | } |
926 | ||
454f18a9 | 927 | /* The one and only one */ |
9adcac5c S |
928 | static struct bus_type hv_bus = { |
929 | .name = "vmbus", | |
930 | .match = vmbus_match, | |
931 | .shutdown = vmbus_shutdown, | |
932 | .remove = vmbus_remove, | |
933 | .probe = vmbus_probe, | |
934 | .uevent = vmbus_uevent, | |
fc76936d SH |
935 | .dev_groups = vmbus_dev_groups, |
936 | .drv_groups = vmbus_drv_groups, | |
3e7ee490 HJ |
937 | }; |
938 | ||
bf6506f6 TT |
939 | struct onmessage_work_context { |
940 | struct work_struct work; | |
941 | struct hv_message msg; | |
942 | }; | |
943 | ||
944 | static void vmbus_onmessage_work(struct work_struct *work) | |
945 | { | |
946 | struct onmessage_work_context *ctx; | |
947 | ||
09a19628 VK |
948 | /* Do not process messages if we're in DISCONNECTED state */ |
949 | if (vmbus_connection.conn_state == DISCONNECTED) | |
950 | return; | |
951 | ||
bf6506f6 TT |
952 | ctx = container_of(work, struct onmessage_work_context, |
953 | work); | |
954 | vmbus_onmessage(&ctx->msg); | |
955 | kfree(ctx); | |
956 | } | |
957 | ||
37cdd991 SH |
958 | static void hv_process_timer_expiration(struct hv_message *msg, |
959 | struct hv_per_cpu_context *hv_cpu) | |
4061ed9e | 960 | { |
37cdd991 | 961 | struct clock_event_device *dev = hv_cpu->clk_evt; |
4061ed9e S |
962 | |
963 | if (dev->event_handler) | |
964 | dev->event_handler(dev); | |
965 | ||
cd95aad5 | 966 | vmbus_signal_eom(msg, HVMSG_TIMER_EXPIRED); |
4061ed9e S |
967 | } |
968 | ||
d81274aa | 969 | void vmbus_on_msg_dpc(unsigned long data) |
36199a99 | 970 | { |
37cdd991 SH |
971 | struct hv_per_cpu_context *hv_cpu = (void *)data; |
972 | void *page_addr = hv_cpu->synic_message_page; | |
36199a99 GKH |
973 | struct hv_message *msg = (struct hv_message *)page_addr + |
974 | VMBUS_MESSAGE_SINT; | |
652594c7 | 975 | struct vmbus_channel_message_header *hdr; |
e6242fa0 | 976 | const struct vmbus_channel_message_table_entry *entry; |
bf6506f6 | 977 | struct onmessage_work_context *ctx; |
cd95aad5 | 978 | u32 message_type = msg->header.message_type; |
36199a99 | 979 | |
cd95aad5 | 980 | if (message_type == HVMSG_NONE) |
7be3e169 VK |
981 | /* no msg */ |
982 | return; | |
652594c7 | 983 | |
7be3e169 | 984 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
652594c7 | 985 | |
c9fe0f8f VK |
986 | trace_vmbus_on_msg_dpc(hdr); |
987 | ||
7be3e169 VK |
988 | if (hdr->msgtype >= CHANNELMSG_COUNT) { |
989 | WARN_ONCE(1, "unknown msgtype=%d\n", hdr->msgtype); | |
990 | goto msg_handled; | |
991 | } | |
652594c7 | 992 | |
7be3e169 VK |
993 | entry = &channel_message_table[hdr->msgtype]; |
994 | if (entry->handler_type == VMHT_BLOCKING) { | |
995 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); | |
996 | if (ctx == NULL) | |
997 | return; | |
652594c7 | 998 | |
7be3e169 VK |
999 | INIT_WORK(&ctx->work, vmbus_onmessage_work); |
1000 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
652594c7 | 1001 | |
54a66265 S |
1002 | /* |
1003 | * The host can generate a rescind message while we | |
1004 | * may still be handling the original offer. We deal with | |
1005 | * this condition by ensuring the processing is done on the | |
1006 | * same CPU. | |
1007 | */ | |
1008 | switch (hdr->msgtype) { | |
1009 | case CHANNELMSG_RESCIND_CHANNELOFFER: | |
1010 | /* | |
1011 | * If we are handling the rescind message; | |
1012 | * schedule the work on the global work queue. | |
1013 | */ | |
1014 | schedule_work_on(vmbus_connection.connect_cpu, | |
1015 | &ctx->work); | |
1016 | break; | |
1017 | ||
1018 | case CHANNELMSG_OFFERCHANNEL: | |
1019 | atomic_inc(&vmbus_connection.offer_in_progress); | |
1020 | queue_work_on(vmbus_connection.connect_cpu, | |
1021 | vmbus_connection.work_queue, | |
1022 | &ctx->work); | |
1023 | break; | |
1024 | ||
1025 | default: | |
1026 | queue_work(vmbus_connection.work_queue, &ctx->work); | |
1027 | } | |
7be3e169 VK |
1028 | } else |
1029 | entry->message_handler(hdr); | |
36199a99 | 1030 | |
652594c7 | 1031 | msg_handled: |
cd95aad5 | 1032 | vmbus_signal_eom(msg, message_type); |
36199a99 GKH |
1033 | } |
1034 | ||
631e63a9 | 1035 | |
b71e3282 SH |
1036 | /* |
1037 | * Direct callback for channels using other deferred processing | |
1038 | */ | |
1039 | static void vmbus_channel_isr(struct vmbus_channel *channel) | |
1040 | { | |
1041 | void (*callback_fn)(void *); | |
1042 | ||
1043 | callback_fn = READ_ONCE(channel->onchannel_callback); | |
1044 | if (likely(callback_fn != NULL)) | |
1045 | (*callback_fn)(channel->channel_callback_context); | |
1046 | } | |
1047 | ||
631e63a9 SH |
1048 | /* |
1049 | * Schedule all channels with events pending | |
1050 | */ | |
1051 | static void vmbus_chan_sched(struct hv_per_cpu_context *hv_cpu) | |
1052 | { | |
1053 | unsigned long *recv_int_page; | |
1054 | u32 maxbits, relid; | |
1055 | ||
1056 | if (vmbus_proto_version < VERSION_WIN8) { | |
1057 | maxbits = MAX_NUM_CHANNELS_SUPPORTED; | |
1058 | recv_int_page = vmbus_connection.recv_int_page; | |
1059 | } else { | |
1060 | /* | |
1061 | * When the host is win8 and beyond, the event page | |
1062 | * can be directly checked to get the id of the channel | |
1063 | * that has the interrupt pending. | |
1064 | */ | |
1065 | void *page_addr = hv_cpu->synic_event_page; | |
1066 | union hv_synic_event_flags *event | |
1067 | = (union hv_synic_event_flags *)page_addr + | |
1068 | VMBUS_MESSAGE_SINT; | |
1069 | ||
1070 | maxbits = HV_EVENT_FLAGS_COUNT; | |
1071 | recv_int_page = event->flags; | |
1072 | } | |
1073 | ||
1074 | if (unlikely(!recv_int_page)) | |
1075 | return; | |
1076 | ||
1077 | for_each_set_bit(relid, recv_int_page, maxbits) { | |
1078 | struct vmbus_channel *channel; | |
1079 | ||
1080 | if (!sync_test_and_clear_bit(relid, recv_int_page)) | |
1081 | continue; | |
1082 | ||
1083 | /* Special case - vmbus channel protocol msg */ | |
1084 | if (relid == 0) | |
1085 | continue; | |
1086 | ||
8200f208 SH |
1087 | rcu_read_lock(); |
1088 | ||
631e63a9 | 1089 | /* Find channel based on relid */ |
8200f208 | 1090 | list_for_each_entry_rcu(channel, &hv_cpu->chan_list, percpu_list) { |
b71e3282 SH |
1091 | if (channel->offermsg.child_relid != relid) |
1092 | continue; | |
1093 | ||
6f3d791f S |
1094 | if (channel->rescind) |
1095 | continue; | |
1096 | ||
991f8f1c VK |
1097 | trace_vmbus_chan_sched(channel); |
1098 | ||
6981fbf3 SH |
1099 | ++channel->interrupts; |
1100 | ||
b71e3282 SH |
1101 | switch (channel->callback_mode) { |
1102 | case HV_CALL_ISR: | |
1103 | vmbus_channel_isr(channel); | |
631e63a9 | 1104 | break; |
b71e3282 SH |
1105 | |
1106 | case HV_CALL_BATCHED: | |
1107 | hv_begin_read(&channel->inbound); | |
1108 | /* fallthrough */ | |
1109 | case HV_CALL_DIRECT: | |
1110 | tasklet_schedule(&channel->callback_event); | |
631e63a9 SH |
1111 | } |
1112 | } | |
8200f208 SH |
1113 | |
1114 | rcu_read_unlock(); | |
631e63a9 SH |
1115 | } |
1116 | } | |
1117 | ||
76d388cd | 1118 | static void vmbus_isr(void) |
36199a99 | 1119 | { |
37cdd991 SH |
1120 | struct hv_per_cpu_context *hv_cpu |
1121 | = this_cpu_ptr(hv_context.cpu_context); | |
1122 | void *page_addr = hv_cpu->synic_event_page; | |
36199a99 GKH |
1123 | struct hv_message *msg; |
1124 | union hv_synic_event_flags *event; | |
ae4636e6 | 1125 | bool handled = false; |
36199a99 | 1126 | |
37cdd991 | 1127 | if (unlikely(page_addr == NULL)) |
76d388cd | 1128 | return; |
5ab05951 S |
1129 | |
1130 | event = (union hv_synic_event_flags *)page_addr + | |
1131 | VMBUS_MESSAGE_SINT; | |
7341d908 S |
1132 | /* |
1133 | * Check for events before checking for messages. This is the order | |
1134 | * in which events and messages are checked in Windows guests on | |
1135 | * Hyper-V, and the Windows team suggested we do the same. | |
1136 | */ | |
36199a99 | 1137 | |
6552ecd7 S |
1138 | if ((vmbus_proto_version == VERSION_WS2008) || |
1139 | (vmbus_proto_version == VERSION_WIN7)) { | |
36199a99 | 1140 | |
6552ecd7 | 1141 | /* Since we are a child, we only need to check bit 0 */ |
5c1bec61 | 1142 | if (sync_test_and_clear_bit(0, event->flags)) |
6552ecd7 | 1143 | handled = true; |
6552ecd7 S |
1144 | } else { |
1145 | /* | |
1146 | * Our host is win8 or above. The signaling mechanism | |
1147 | * has changed and we can directly look at the event page. | |
1148 | * If bit n is set then we have an interrup on the channel | |
1149 | * whose id is n. | |
1150 | */ | |
ae4636e6 | 1151 | handled = true; |
ae4636e6 | 1152 | } |
793be9c7 | 1153 | |
6552ecd7 | 1154 | if (handled) |
631e63a9 | 1155 | vmbus_chan_sched(hv_cpu); |
6552ecd7 | 1156 | |
37cdd991 | 1157 | page_addr = hv_cpu->synic_message_page; |
7341d908 S |
1158 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; |
1159 | ||
1160 | /* Check if there are actual msgs to be processed */ | |
4061ed9e S |
1161 | if (msg->header.message_type != HVMSG_NONE) { |
1162 | if (msg->header.message_type == HVMSG_TIMER_EXPIRED) | |
37cdd991 | 1163 | hv_process_timer_expiration(msg, hv_cpu); |
4061ed9e | 1164 | else |
37cdd991 | 1165 | tasklet_schedule(&hv_cpu->msg_dpc); |
4061ed9e | 1166 | } |
4b44f2d1 SM |
1167 | |
1168 | add_interrupt_randomness(HYPERVISOR_CALLBACK_VECTOR, 0); | |
793be9c7 S |
1169 | } |
1170 | ||
81b18bce SM |
1171 | /* |
1172 | * Boolean to control whether to report panic messages over Hyper-V. | |
1173 | * | |
1174 | * It can be set via /proc/sys/kernel/hyperv/record_panic_msg | |
1175 | */ | |
1176 | static int sysctl_record_panic_msg = 1; | |
1177 | ||
1178 | /* | |
1179 | * Callback from kmsg_dump. Grab as much as possible from the end of the kmsg | |
1180 | * buffer and call into Hyper-V to transfer the data. | |
1181 | */ | |
1182 | static void hv_kmsg_dump(struct kmsg_dumper *dumper, | |
1183 | enum kmsg_dump_reason reason) | |
1184 | { | |
1185 | size_t bytes_written; | |
1186 | phys_addr_t panic_pa; | |
1187 | ||
1188 | /* We are only interested in panics. */ | |
1189 | if ((reason != KMSG_DUMP_PANIC) || (!sysctl_record_panic_msg)) | |
1190 | return; | |
1191 | ||
1192 | panic_pa = virt_to_phys(hv_panic_page); | |
1193 | ||
1194 | /* | |
1195 | * Write dump contents to the page. No need to synchronize; panic should | |
1196 | * be single-threaded. | |
1197 | */ | |
ddcaf3ca SM |
1198 | kmsg_dump_get_buffer(dumper, true, hv_panic_page, PAGE_SIZE, |
1199 | &bytes_written); | |
1200 | if (bytes_written) | |
1201 | hyperv_report_panic_msg(panic_pa, bytes_written); | |
81b18bce SM |
1202 | } |
1203 | ||
1204 | static struct kmsg_dumper hv_kmsg_dumper = { | |
1205 | .dump = hv_kmsg_dump, | |
1206 | }; | |
1207 | ||
1208 | static struct ctl_table_header *hv_ctl_table_hdr; | |
1209 | static int zero; | |
1210 | static int one = 1; | |
1211 | ||
1212 | /* | |
1213 | * sysctl option to allow the user to control whether kmsg data should be | |
1214 | * reported to Hyper-V on panic. | |
1215 | */ | |
1216 | static struct ctl_table hv_ctl_table[] = { | |
1217 | { | |
1218 | .procname = "hyperv_record_panic_msg", | |
1219 | .data = &sysctl_record_panic_msg, | |
1220 | .maxlen = sizeof(int), | |
1221 | .mode = 0644, | |
1222 | .proc_handler = proc_dointvec_minmax, | |
1223 | .extra1 = &zero, | |
1224 | .extra2 = &one | |
1225 | }, | |
1226 | {} | |
1227 | }; | |
1228 | ||
1229 | static struct ctl_table hv_root_table[] = { | |
1230 | { | |
1231 | .procname = "kernel", | |
1232 | .mode = 0555, | |
1233 | .child = hv_ctl_table | |
1234 | }, | |
1235 | {} | |
1236 | }; | |
e513229b | 1237 | |
3e189519 | 1238 | /* |
90c9960e GKH |
1239 | * vmbus_bus_init -Main vmbus driver initialization routine. |
1240 | * | |
1241 | * Here, we | |
0686e4f4 | 1242 | * - initialize the vmbus driver context |
0686e4f4 | 1243 | * - invoke the vmbus hv main init routine |
0686e4f4 | 1244 | * - retrieve the channel offers |
90c9960e | 1245 | */ |
efc26722 | 1246 | static int vmbus_bus_init(void) |
3e7ee490 | 1247 | { |
90c9960e | 1248 | int ret; |
3e7ee490 | 1249 | |
6d26e38f GKH |
1250 | /* Hypervisor initialization...setup hypercall page..etc */ |
1251 | ret = hv_init(); | |
90c9960e | 1252 | if (ret != 0) { |
0a46618d | 1253 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); |
d6c1c5de | 1254 | return ret; |
3e7ee490 HJ |
1255 | } |
1256 | ||
9adcac5c | 1257 | ret = bus_register(&hv_bus); |
d6c1c5de | 1258 | if (ret) |
d6f3609d | 1259 | return ret; |
3e7ee490 | 1260 | |
76d388cd | 1261 | hv_setup_vmbus_irq(vmbus_isr); |
3e7ee490 | 1262 | |
2608fb65 JW |
1263 | ret = hv_synic_alloc(); |
1264 | if (ret) | |
1265 | goto err_alloc; | |
800b6902 | 1266 | /* |
302a3c0f | 1267 | * Initialize the per-cpu interrupt state and |
800b6902 S |
1268 | * connect to the host. |
1269 | */ | |
4a5f3cde | 1270 | ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hyperv/vmbus:online", |
76d36ab7 VK |
1271 | hv_synic_init, hv_synic_cleanup); |
1272 | if (ret < 0) | |
1273 | goto err_alloc; | |
1274 | hyperv_cpuhp_online = ret; | |
1275 | ||
800b6902 | 1276 | ret = vmbus_connect(); |
8b9987e9 | 1277 | if (ret) |
17efbee8 | 1278 | goto err_connect; |
800b6902 | 1279 | |
96c1d058 NM |
1280 | /* |
1281 | * Only register if the crash MSRs are available | |
1282 | */ | |
cc2dd402 | 1283 | if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) { |
81b18bce SM |
1284 | u64 hyperv_crash_ctl; |
1285 | /* | |
1286 | * Sysctl registration is not fatal, since by default | |
1287 | * reporting is enabled. | |
1288 | */ | |
1289 | hv_ctl_table_hdr = register_sysctl_table(hv_root_table); | |
1290 | if (!hv_ctl_table_hdr) | |
1291 | pr_err("Hyper-V: sysctl table register error"); | |
1292 | ||
1293 | /* | |
1294 | * Register for panic kmsg callback only if the right | |
1295 | * capability is supported by the hypervisor. | |
1296 | */ | |
9d9c9656 | 1297 | hv_get_crash_ctl(hyperv_crash_ctl); |
81b18bce SM |
1298 | if (hyperv_crash_ctl & HV_CRASH_CTL_CRASH_NOTIFY_MSG) { |
1299 | hv_panic_page = (void *)get_zeroed_page(GFP_KERNEL); | |
1300 | if (hv_panic_page) { | |
1301 | ret = kmsg_dump_register(&hv_kmsg_dumper); | |
1302 | if (ret) | |
1303 | pr_err("Hyper-V: kmsg dump register " | |
1304 | "error 0x%x\n", ret); | |
1305 | } else | |
1306 | pr_err("Hyper-V: panic message page memory " | |
1307 | "allocation failed"); | |
1308 | } | |
1309 | ||
510f7aef | 1310 | register_die_notifier(&hyperv_die_block); |
96c1d058 NM |
1311 | atomic_notifier_chain_register(&panic_notifier_list, |
1312 | &hyperv_panic_block); | |
1313 | } | |
1314 | ||
2d6e882b | 1315 | vmbus_request_offers(); |
8b5d6d3b | 1316 | |
d6c1c5de | 1317 | return 0; |
8b9987e9 | 1318 | |
17efbee8 | 1319 | err_connect: |
76d36ab7 | 1320 | cpuhp_remove_state(hyperv_cpuhp_online); |
2608fb65 JW |
1321 | err_alloc: |
1322 | hv_synic_free(); | |
76d388cd | 1323 | hv_remove_vmbus_irq(); |
8b9987e9 | 1324 | |
8b9987e9 | 1325 | bus_unregister(&hv_bus); |
81b18bce | 1326 | free_page((unsigned long)hv_panic_page); |
8afc06dd SM |
1327 | unregister_sysctl_table(hv_ctl_table_hdr); |
1328 | hv_ctl_table_hdr = NULL; | |
8b9987e9 | 1329 | return ret; |
3e7ee490 HJ |
1330 | } |
1331 | ||
90c9960e | 1332 | /** |
35464483 JO |
1333 | * __vmbus_child_driver_register() - Register a vmbus's driver |
1334 | * @hv_driver: Pointer to driver structure you want to register | |
768fa219 GKH |
1335 | * @owner: owner module of the drv |
1336 | * @mod_name: module name string | |
3e189519 HJ |
1337 | * |
1338 | * Registers the given driver with Linux through the 'driver_register()' call | |
768fa219 | 1339 | * and sets up the hyper-v vmbus handling for this driver. |
3e189519 HJ |
1340 | * It will return the state of the 'driver_register()' call. |
1341 | * | |
90c9960e | 1342 | */ |
768fa219 | 1343 | int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) |
3e7ee490 | 1344 | { |
5d48a1c2 | 1345 | int ret; |
3e7ee490 | 1346 | |
768fa219 | 1347 | pr_info("registering driver %s\n", hv_driver->name); |
3e7ee490 | 1348 | |
cf6a2eac S |
1349 | ret = vmbus_exists(); |
1350 | if (ret < 0) | |
1351 | return ret; | |
1352 | ||
768fa219 GKH |
1353 | hv_driver->driver.name = hv_driver->name; |
1354 | hv_driver->driver.owner = owner; | |
1355 | hv_driver->driver.mod_name = mod_name; | |
1356 | hv_driver->driver.bus = &hv_bus; | |
3e7ee490 | 1357 | |
fc76936d SH |
1358 | spin_lock_init(&hv_driver->dynids.lock); |
1359 | INIT_LIST_HEAD(&hv_driver->dynids.list); | |
1360 | ||
768fa219 | 1361 | ret = driver_register(&hv_driver->driver); |
3e7ee490 | 1362 | |
5d48a1c2 | 1363 | return ret; |
3e7ee490 | 1364 | } |
768fa219 | 1365 | EXPORT_SYMBOL_GPL(__vmbus_driver_register); |
3e7ee490 | 1366 | |
90c9960e | 1367 | /** |
768fa219 | 1368 | * vmbus_driver_unregister() - Unregister a vmbus's driver |
35464483 JO |
1369 | * @hv_driver: Pointer to driver structure you want to |
1370 | * un-register | |
3e189519 | 1371 | * |
768fa219 GKH |
1372 | * Un-register the given driver that was previous registered with a call to |
1373 | * vmbus_driver_register() | |
90c9960e | 1374 | */ |
768fa219 | 1375 | void vmbus_driver_unregister(struct hv_driver *hv_driver) |
3e7ee490 | 1376 | { |
768fa219 | 1377 | pr_info("unregistering driver %s\n", hv_driver->name); |
3e7ee490 | 1378 | |
fc76936d | 1379 | if (!vmbus_exists()) { |
8f257a14 | 1380 | driver_unregister(&hv_driver->driver); |
fc76936d SH |
1381 | vmbus_free_dynids(hv_driver); |
1382 | } | |
3e7ee490 | 1383 | } |
768fa219 | 1384 | EXPORT_SYMBOL_GPL(vmbus_driver_unregister); |
3e7ee490 | 1385 | |
c2e5df61 SH |
1386 | |
1387 | /* | |
1388 | * Called when last reference to channel is gone. | |
1389 | */ | |
1390 | static void vmbus_chan_release(struct kobject *kobj) | |
1391 | { | |
1392 | struct vmbus_channel *channel | |
1393 | = container_of(kobj, struct vmbus_channel, kobj); | |
1394 | ||
1395 | kfree_rcu(channel, rcu); | |
1396 | } | |
1397 | ||
1398 | struct vmbus_chan_attribute { | |
1399 | struct attribute attr; | |
14948e39 | 1400 | ssize_t (*show)(struct vmbus_channel *chan, char *buf); |
c2e5df61 SH |
1401 | ssize_t (*store)(struct vmbus_channel *chan, |
1402 | const char *buf, size_t count); | |
1403 | }; | |
1404 | #define VMBUS_CHAN_ATTR(_name, _mode, _show, _store) \ | |
1405 | struct vmbus_chan_attribute chan_attr_##_name \ | |
1406 | = __ATTR(_name, _mode, _show, _store) | |
1407 | #define VMBUS_CHAN_ATTR_RW(_name) \ | |
1408 | struct vmbus_chan_attribute chan_attr_##_name = __ATTR_RW(_name) | |
1409 | #define VMBUS_CHAN_ATTR_RO(_name) \ | |
1410 | struct vmbus_chan_attribute chan_attr_##_name = __ATTR_RO(_name) | |
1411 | #define VMBUS_CHAN_ATTR_WO(_name) \ | |
1412 | struct vmbus_chan_attribute chan_attr_##_name = __ATTR_WO(_name) | |
1413 | ||
1414 | static ssize_t vmbus_chan_attr_show(struct kobject *kobj, | |
1415 | struct attribute *attr, char *buf) | |
1416 | { | |
1417 | const struct vmbus_chan_attribute *attribute | |
1418 | = container_of(attr, struct vmbus_chan_attribute, attr); | |
14948e39 | 1419 | struct vmbus_channel *chan |
c2e5df61 SH |
1420 | = container_of(kobj, struct vmbus_channel, kobj); |
1421 | ||
1422 | if (!attribute->show) | |
1423 | return -EIO; | |
1424 | ||
1425 | return attribute->show(chan, buf); | |
1426 | } | |
1427 | ||
1428 | static const struct sysfs_ops vmbus_chan_sysfs_ops = { | |
1429 | .show = vmbus_chan_attr_show, | |
1430 | }; | |
1431 | ||
14948e39 | 1432 | static ssize_t out_mask_show(struct vmbus_channel *channel, char *buf) |
c2e5df61 | 1433 | { |
14948e39 KB |
1434 | struct hv_ring_buffer_info *rbi = &channel->outbound; |
1435 | ssize_t ret; | |
c2e5df61 | 1436 | |
14948e39 KB |
1437 | mutex_lock(&rbi->ring_buffer_mutex); |
1438 | if (!rbi->ring_buffer) { | |
1439 | mutex_unlock(&rbi->ring_buffer_mutex); | |
fcedbb29 | 1440 | return -EINVAL; |
14948e39 | 1441 | } |
fcedbb29 | 1442 | |
14948e39 KB |
1443 | ret = sprintf(buf, "%u\n", rbi->ring_buffer->interrupt_mask); |
1444 | mutex_unlock(&rbi->ring_buffer_mutex); | |
1445 | return ret; | |
c2e5df61 | 1446 | } |
875c362b | 1447 | static VMBUS_CHAN_ATTR_RO(out_mask); |
c2e5df61 | 1448 | |
14948e39 | 1449 | static ssize_t in_mask_show(struct vmbus_channel *channel, char *buf) |
c2e5df61 | 1450 | { |
14948e39 KB |
1451 | struct hv_ring_buffer_info *rbi = &channel->inbound; |
1452 | ssize_t ret; | |
c2e5df61 | 1453 | |
14948e39 KB |
1454 | mutex_lock(&rbi->ring_buffer_mutex); |
1455 | if (!rbi->ring_buffer) { | |
1456 | mutex_unlock(&rbi->ring_buffer_mutex); | |
fcedbb29 | 1457 | return -EINVAL; |
14948e39 | 1458 | } |
fcedbb29 | 1459 | |
14948e39 KB |
1460 | ret = sprintf(buf, "%u\n", rbi->ring_buffer->interrupt_mask); |
1461 | mutex_unlock(&rbi->ring_buffer_mutex); | |
1462 | return ret; | |
c2e5df61 | 1463 | } |
875c362b | 1464 | static VMBUS_CHAN_ATTR_RO(in_mask); |
c2e5df61 | 1465 | |
14948e39 | 1466 | static ssize_t read_avail_show(struct vmbus_channel *channel, char *buf) |
c2e5df61 | 1467 | { |
14948e39 KB |
1468 | struct hv_ring_buffer_info *rbi = &channel->inbound; |
1469 | ssize_t ret; | |
c2e5df61 | 1470 | |
14948e39 KB |
1471 | mutex_lock(&rbi->ring_buffer_mutex); |
1472 | if (!rbi->ring_buffer) { | |
1473 | mutex_unlock(&rbi->ring_buffer_mutex); | |
fcedbb29 | 1474 | return -EINVAL; |
14948e39 | 1475 | } |
fcedbb29 | 1476 | |
14948e39 KB |
1477 | ret = sprintf(buf, "%u\n", hv_get_bytes_to_read(rbi)); |
1478 | mutex_unlock(&rbi->ring_buffer_mutex); | |
1479 | return ret; | |
c2e5df61 | 1480 | } |
875c362b | 1481 | static VMBUS_CHAN_ATTR_RO(read_avail); |
c2e5df61 | 1482 | |
14948e39 | 1483 | static ssize_t write_avail_show(struct vmbus_channel *channel, char *buf) |
c2e5df61 | 1484 | { |
14948e39 KB |
1485 | struct hv_ring_buffer_info *rbi = &channel->outbound; |
1486 | ssize_t ret; | |
c2e5df61 | 1487 | |
14948e39 KB |
1488 | mutex_lock(&rbi->ring_buffer_mutex); |
1489 | if (!rbi->ring_buffer) { | |
1490 | mutex_unlock(&rbi->ring_buffer_mutex); | |
fcedbb29 | 1491 | return -EINVAL; |
14948e39 | 1492 | } |
fcedbb29 | 1493 | |
14948e39 KB |
1494 | ret = sprintf(buf, "%u\n", hv_get_bytes_to_write(rbi)); |
1495 | mutex_unlock(&rbi->ring_buffer_mutex); | |
1496 | return ret; | |
c2e5df61 | 1497 | } |
875c362b | 1498 | static VMBUS_CHAN_ATTR_RO(write_avail); |
c2e5df61 | 1499 | |
14948e39 | 1500 | static ssize_t show_target_cpu(struct vmbus_channel *channel, char *buf) |
c2e5df61 SH |
1501 | { |
1502 | return sprintf(buf, "%u\n", channel->target_cpu); | |
1503 | } | |
875c362b | 1504 | static VMBUS_CHAN_ATTR(cpu, S_IRUGO, show_target_cpu, NULL); |
c2e5df61 | 1505 | |
14948e39 | 1506 | static ssize_t channel_pending_show(struct vmbus_channel *channel, |
c2e5df61 SH |
1507 | char *buf) |
1508 | { | |
1509 | return sprintf(buf, "%d\n", | |
1510 | channel_pending(channel, | |
1511 | vmbus_connection.monitor_pages[1])); | |
1512 | } | |
875c362b | 1513 | static VMBUS_CHAN_ATTR(pending, S_IRUGO, channel_pending_show, NULL); |
c2e5df61 | 1514 | |
14948e39 | 1515 | static ssize_t channel_latency_show(struct vmbus_channel *channel, |
c2e5df61 SH |
1516 | char *buf) |
1517 | { | |
1518 | return sprintf(buf, "%d\n", | |
1519 | channel_latency(channel, | |
1520 | vmbus_connection.monitor_pages[1])); | |
1521 | } | |
875c362b | 1522 | static VMBUS_CHAN_ATTR(latency, S_IRUGO, channel_latency_show, NULL); |
c2e5df61 | 1523 | |
14948e39 | 1524 | static ssize_t channel_interrupts_show(struct vmbus_channel *channel, char *buf) |
6981fbf3 SH |
1525 | { |
1526 | return sprintf(buf, "%llu\n", channel->interrupts); | |
1527 | } | |
875c362b | 1528 | static VMBUS_CHAN_ATTR(interrupts, S_IRUGO, channel_interrupts_show, NULL); |
6981fbf3 | 1529 | |
14948e39 | 1530 | static ssize_t channel_events_show(struct vmbus_channel *channel, char *buf) |
6981fbf3 SH |
1531 | { |
1532 | return sprintf(buf, "%llu\n", channel->sig_events); | |
1533 | } | |
875c362b | 1534 | static VMBUS_CHAN_ATTR(events, S_IRUGO, channel_events_show, NULL); |
6981fbf3 | 1535 | |
14948e39 | 1536 | static ssize_t channel_intr_in_full_show(struct vmbus_channel *channel, |
396ae57e KB |
1537 | char *buf) |
1538 | { | |
1539 | return sprintf(buf, "%llu\n", | |
1540 | (unsigned long long)channel->intr_in_full); | |
1541 | } | |
1542 | static VMBUS_CHAN_ATTR(intr_in_full, 0444, channel_intr_in_full_show, NULL); | |
1543 | ||
14948e39 | 1544 | static ssize_t channel_intr_out_empty_show(struct vmbus_channel *channel, |
396ae57e KB |
1545 | char *buf) |
1546 | { | |
1547 | return sprintf(buf, "%llu\n", | |
1548 | (unsigned long long)channel->intr_out_empty); | |
1549 | } | |
1550 | static VMBUS_CHAN_ATTR(intr_out_empty, 0444, channel_intr_out_empty_show, NULL); | |
1551 | ||
14948e39 | 1552 | static ssize_t channel_out_full_first_show(struct vmbus_channel *channel, |
396ae57e KB |
1553 | char *buf) |
1554 | { | |
1555 | return sprintf(buf, "%llu\n", | |
1556 | (unsigned long long)channel->out_full_first); | |
1557 | } | |
1558 | static VMBUS_CHAN_ATTR(out_full_first, 0444, channel_out_full_first_show, NULL); | |
1559 | ||
14948e39 | 1560 | static ssize_t channel_out_full_total_show(struct vmbus_channel *channel, |
396ae57e KB |
1561 | char *buf) |
1562 | { | |
1563 | return sprintf(buf, "%llu\n", | |
1564 | (unsigned long long)channel->out_full_total); | |
1565 | } | |
1566 | static VMBUS_CHAN_ATTR(out_full_total, 0444, channel_out_full_total_show, NULL); | |
1567 | ||
14948e39 | 1568 | static ssize_t subchannel_monitor_id_show(struct vmbus_channel *channel, |
f0fa2974 SH |
1569 | char *buf) |
1570 | { | |
1571 | return sprintf(buf, "%u\n", channel->offermsg.monitorid); | |
1572 | } | |
1573 | static VMBUS_CHAN_ATTR(monitor_id, S_IRUGO, subchannel_monitor_id_show, NULL); | |
1574 | ||
14948e39 | 1575 | static ssize_t subchannel_id_show(struct vmbus_channel *channel, |
f0fa2974 SH |
1576 | char *buf) |
1577 | { | |
1578 | return sprintf(buf, "%u\n", | |
1579 | channel->offermsg.offer.sub_channel_index); | |
1580 | } | |
1581 | static VMBUS_CHAN_ATTR_RO(subchannel_id); | |
1582 | ||
c2e5df61 SH |
1583 | static struct attribute *vmbus_chan_attrs[] = { |
1584 | &chan_attr_out_mask.attr, | |
1585 | &chan_attr_in_mask.attr, | |
1586 | &chan_attr_read_avail.attr, | |
1587 | &chan_attr_write_avail.attr, | |
1588 | &chan_attr_cpu.attr, | |
1589 | &chan_attr_pending.attr, | |
1590 | &chan_attr_latency.attr, | |
6981fbf3 SH |
1591 | &chan_attr_interrupts.attr, |
1592 | &chan_attr_events.attr, | |
396ae57e KB |
1593 | &chan_attr_intr_in_full.attr, |
1594 | &chan_attr_intr_out_empty.attr, | |
1595 | &chan_attr_out_full_first.attr, | |
1596 | &chan_attr_out_full_total.attr, | |
f0fa2974 SH |
1597 | &chan_attr_monitor_id.attr, |
1598 | &chan_attr_subchannel_id.attr, | |
c2e5df61 SH |
1599 | NULL |
1600 | }; | |
1601 | ||
46fc1548 KB |
1602 | /* |
1603 | * Channel-level attribute_group callback function. Returns the permission for | |
1604 | * each attribute, and returns 0 if an attribute is not visible. | |
1605 | */ | |
1606 | static umode_t vmbus_chan_attr_is_visible(struct kobject *kobj, | |
1607 | struct attribute *attr, int idx) | |
1608 | { | |
1609 | const struct vmbus_channel *channel = | |
1610 | container_of(kobj, struct vmbus_channel, kobj); | |
1611 | ||
1612 | /* Hide the monitor attributes if the monitor mechanism is not used. */ | |
1613 | if (!channel->offermsg.monitor_allocated && | |
1614 | (attr == &chan_attr_pending.attr || | |
1615 | attr == &chan_attr_latency.attr || | |
1616 | attr == &chan_attr_monitor_id.attr)) | |
1617 | return 0; | |
1618 | ||
1619 | return attr->mode; | |
1620 | } | |
1621 | ||
1622 | static struct attribute_group vmbus_chan_group = { | |
1623 | .attrs = vmbus_chan_attrs, | |
1624 | .is_visible = vmbus_chan_attr_is_visible | |
1625 | }; | |
1626 | ||
c2e5df61 SH |
1627 | static struct kobj_type vmbus_chan_ktype = { |
1628 | .sysfs_ops = &vmbus_chan_sysfs_ops, | |
1629 | .release = vmbus_chan_release, | |
c2e5df61 SH |
1630 | }; |
1631 | ||
1632 | /* | |
1633 | * vmbus_add_channel_kobj - setup a sub-directory under device/channels | |
1634 | */ | |
1635 | int vmbus_add_channel_kobj(struct hv_device *dev, struct vmbus_channel *channel) | |
1636 | { | |
46fc1548 | 1637 | const struct device *device = &dev->device; |
c2e5df61 SH |
1638 | struct kobject *kobj = &channel->kobj; |
1639 | u32 relid = channel->offermsg.child_relid; | |
1640 | int ret; | |
1641 | ||
1642 | kobj->kset = dev->channels_kset; | |
1643 | ret = kobject_init_and_add(kobj, &vmbus_chan_ktype, NULL, | |
1644 | "%u", relid); | |
1645 | if (ret) | |
1646 | return ret; | |
1647 | ||
46fc1548 KB |
1648 | ret = sysfs_create_group(kobj, &vmbus_chan_group); |
1649 | ||
1650 | if (ret) { | |
1651 | /* | |
1652 | * The calling functions' error handling paths will cleanup the | |
1653 | * empty channel directory. | |
1654 | */ | |
1655 | dev_err(device, "Unable to set up channel sysfs files\n"); | |
1656 | return ret; | |
1657 | } | |
1658 | ||
c2e5df61 SH |
1659 | kobject_uevent(kobj, KOBJ_ADD); |
1660 | ||
1661 | return 0; | |
1662 | } | |
1663 | ||
46fc1548 KB |
1664 | /* |
1665 | * vmbus_remove_channel_attr_group - remove the channel's attribute group | |
1666 | */ | |
1667 | void vmbus_remove_channel_attr_group(struct vmbus_channel *channel) | |
1668 | { | |
1669 | sysfs_remove_group(&channel->kobj, &vmbus_chan_group); | |
1670 | } | |
1671 | ||
3e189519 | 1672 | /* |
f2c73011 | 1673 | * vmbus_device_create - Creates and registers a new child device |
3e189519 | 1674 | * on the vmbus. |
90c9960e | 1675 | */ |
593db803 AS |
1676 | struct hv_device *vmbus_device_create(const guid_t *type, |
1677 | const guid_t *instance, | |
1b9d48f2 | 1678 | struct vmbus_channel *channel) |
3e7ee490 | 1679 | { |
3d3b5518 | 1680 | struct hv_device *child_device_obj; |
3e7ee490 | 1681 | |
6bad88da S |
1682 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); |
1683 | if (!child_device_obj) { | |
0a46618d | 1684 | pr_err("Unable to allocate device object for child device\n"); |
3e7ee490 HJ |
1685 | return NULL; |
1686 | } | |
1687 | ||
cae5b843 | 1688 | child_device_obj->channel = channel; |
593db803 AS |
1689 | guid_copy(&child_device_obj->dev_type, type); |
1690 | guid_copy(&child_device_obj->dev_instance, instance); | |
7047f17d | 1691 | child_device_obj->vendor_id = 0x1414; /* MSFT vendor ID */ |
3e7ee490 | 1692 | |
3e7ee490 HJ |
1693 | return child_device_obj; |
1694 | } | |
1695 | ||
3e189519 | 1696 | /* |
22794281 | 1697 | * vmbus_device_register - Register the child device |
90c9960e | 1698 | */ |
22794281 | 1699 | int vmbus_device_register(struct hv_device *child_device_obj) |
3e7ee490 | 1700 | { |
c2e5df61 SH |
1701 | struct kobject *kobj = &child_device_obj->device.kobj; |
1702 | int ret; | |
6bad88da | 1703 | |
f6b2db08 | 1704 | dev_set_name(&child_device_obj->device, "%pUl", |
b294809d | 1705 | child_device_obj->channel->offermsg.offer.if_instance.b); |
3e7ee490 | 1706 | |
0bce28b6 | 1707 | child_device_obj->device.bus = &hv_bus; |
607c1a11 | 1708 | child_device_obj->device.parent = &hv_acpi_dev->dev; |
6bad88da | 1709 | child_device_obj->device.release = vmbus_device_release; |
3e7ee490 | 1710 | |
90c9960e GKH |
1711 | /* |
1712 | * Register with the LDM. This will kick off the driver/device | |
1713 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
1714 | */ | |
6bad88da | 1715 | ret = device_register(&child_device_obj->device); |
c2e5df61 | 1716 | if (ret) { |
0a46618d | 1717 | pr_err("Unable to register child device\n"); |
c2e5df61 SH |
1718 | return ret; |
1719 | } | |
1720 | ||
1721 | child_device_obj->channels_kset = kset_create_and_add("channels", | |
1722 | NULL, kobj); | |
1723 | if (!child_device_obj->channels_kset) { | |
1724 | ret = -ENOMEM; | |
1725 | goto err_dev_unregister; | |
1726 | } | |
1727 | ||
1728 | ret = vmbus_add_channel_kobj(child_device_obj, | |
1729 | child_device_obj->channel); | |
1730 | if (ret) { | |
1731 | pr_err("Unable to register primary channeln"); | |
1732 | goto err_kset_unregister; | |
1733 | } | |
1734 | ||
1735 | return 0; | |
1736 | ||
1737 | err_kset_unregister: | |
1738 | kset_unregister(child_device_obj->channels_kset); | |
3e7ee490 | 1739 | |
c2e5df61 SH |
1740 | err_dev_unregister: |
1741 | device_unregister(&child_device_obj->device); | |
3e7ee490 HJ |
1742 | return ret; |
1743 | } | |
1744 | ||
3e189519 | 1745 | /* |
696453ba | 1746 | * vmbus_device_unregister - Remove the specified child device |
3e189519 | 1747 | * from the vmbus. |
90c9960e | 1748 | */ |
696453ba | 1749 | void vmbus_device_unregister(struct hv_device *device_obj) |
3e7ee490 | 1750 | { |
84672369 FS |
1751 | pr_debug("child device %s unregistered\n", |
1752 | dev_name(&device_obj->device)); | |
1753 | ||
869b5567 DC |
1754 | kset_unregister(device_obj->channels_kset); |
1755 | ||
90c9960e GKH |
1756 | /* |
1757 | * Kick off the process of unregistering the device. | |
1758 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
1759 | */ | |
6bad88da | 1760 | device_unregister(&device_obj->device); |
3e7ee490 HJ |
1761 | } |
1762 | ||
3e7ee490 | 1763 | |
b0069f43 | 1764 | /* |
7f163a6f | 1765 | * VMBUS is an acpi enumerated device. Get the information we |
90f34535 | 1766 | * need from DSDT. |
b0069f43 | 1767 | */ |
7f163a6f | 1768 | #define VTPM_BASE_ADDRESS 0xfed40000 |
90f34535 | 1769 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx) |
b0069f43 | 1770 | { |
7f163a6f JO |
1771 | resource_size_t start = 0; |
1772 | resource_size_t end = 0; | |
1773 | struct resource *new_res; | |
1774 | struct resource **old_res = &hyperv_mmio; | |
1775 | struct resource **prev_res = NULL; | |
1776 | ||
90f34535 | 1777 | switch (res->type) { |
7f163a6f JO |
1778 | |
1779 | /* | |
1780 | * "Address" descriptors are for bus windows. Ignore | |
1781 | * "memory" descriptors, which are for registers on | |
1782 | * devices. | |
1783 | */ | |
1784 | case ACPI_RESOURCE_TYPE_ADDRESS32: | |
1785 | start = res->data.address32.address.minimum; | |
1786 | end = res->data.address32.address.maximum; | |
4eb923f8 | 1787 | break; |
b0069f43 | 1788 | |
90f34535 | 1789 | case ACPI_RESOURCE_TYPE_ADDRESS64: |
7f163a6f JO |
1790 | start = res->data.address64.address.minimum; |
1791 | end = res->data.address64.address.maximum; | |
4eb923f8 | 1792 | break; |
7f163a6f JO |
1793 | |
1794 | default: | |
1795 | /* Unused resource type */ | |
1796 | return AE_OK; | |
1797 | ||
b0069f43 | 1798 | } |
7f163a6f JO |
1799 | /* |
1800 | * Ignore ranges that are below 1MB, as they're not | |
1801 | * necessary or useful here. | |
1802 | */ | |
1803 | if (end < 0x100000) | |
1804 | return AE_OK; | |
1805 | ||
1806 | new_res = kzalloc(sizeof(*new_res), GFP_ATOMIC); | |
1807 | if (!new_res) | |
1808 | return AE_NO_MEMORY; | |
1809 | ||
1810 | /* If this range overlaps the virtual TPM, truncate it. */ | |
1811 | if (end > VTPM_BASE_ADDRESS && start < VTPM_BASE_ADDRESS) | |
1812 | end = VTPM_BASE_ADDRESS; | |
1813 | ||
1814 | new_res->name = "hyperv mmio"; | |
1815 | new_res->flags = IORESOURCE_MEM; | |
1816 | new_res->start = start; | |
1817 | new_res->end = end; | |
1818 | ||
40f26f31 | 1819 | /* |
40f26f31 JO |
1820 | * If two ranges are adjacent, merge them. |
1821 | */ | |
7f163a6f JO |
1822 | do { |
1823 | if (!*old_res) { | |
1824 | *old_res = new_res; | |
1825 | break; | |
1826 | } | |
1827 | ||
40f26f31 JO |
1828 | if (((*old_res)->end + 1) == new_res->start) { |
1829 | (*old_res)->end = new_res->end; | |
1830 | kfree(new_res); | |
1831 | break; | |
1832 | } | |
1833 | ||
1834 | if ((*old_res)->start == new_res->end + 1) { | |
1835 | (*old_res)->start = new_res->start; | |
1836 | kfree(new_res); | |
1837 | break; | |
1838 | } | |
1839 | ||
23a06831 | 1840 | if ((*old_res)->start > new_res->end) { |
7f163a6f JO |
1841 | new_res->sibling = *old_res; |
1842 | if (prev_res) | |
1843 | (*prev_res)->sibling = new_res; | |
1844 | *old_res = new_res; | |
1845 | break; | |
1846 | } | |
1847 | ||
1848 | prev_res = old_res; | |
1849 | old_res = &(*old_res)->sibling; | |
1850 | ||
1851 | } while (1); | |
b0069f43 S |
1852 | |
1853 | return AE_OK; | |
1854 | } | |
1855 | ||
7f163a6f JO |
1856 | static int vmbus_acpi_remove(struct acpi_device *device) |
1857 | { | |
1858 | struct resource *cur_res; | |
1859 | struct resource *next_res; | |
1860 | ||
1861 | if (hyperv_mmio) { | |
6d146aef JO |
1862 | if (fb_mmio) { |
1863 | __release_region(hyperv_mmio, fb_mmio->start, | |
1864 | resource_size(fb_mmio)); | |
1865 | fb_mmio = NULL; | |
1866 | } | |
1867 | ||
7f163a6f JO |
1868 | for (cur_res = hyperv_mmio; cur_res; cur_res = next_res) { |
1869 | next_res = cur_res->sibling; | |
1870 | kfree(cur_res); | |
1871 | } | |
1872 | } | |
1873 | ||
1874 | return 0; | |
1875 | } | |
1876 | ||
6d146aef JO |
1877 | static void vmbus_reserve_fb(void) |
1878 | { | |
1879 | int size; | |
1880 | /* | |
1881 | * Make a claim for the frame buffer in the resource tree under the | |
1882 | * first node, which will be the one below 4GB. The length seems to | |
1883 | * be underreported, particularly in a Generation 1 VM. So start out | |
1884 | * reserving a larger area and make it smaller until it succeeds. | |
1885 | */ | |
1886 | ||
1887 | if (screen_info.lfb_base) { | |
1888 | if (efi_enabled(EFI_BOOT)) | |
1889 | size = max_t(__u32, screen_info.lfb_size, 0x800000); | |
1890 | else | |
1891 | size = max_t(__u32, screen_info.lfb_size, 0x4000000); | |
1892 | ||
1893 | for (; !fb_mmio && (size >= 0x100000); size >>= 1) { | |
1894 | fb_mmio = __request_region(hyperv_mmio, | |
1895 | screen_info.lfb_base, size, | |
1896 | fb_mmio_name, 0); | |
1897 | } | |
1898 | } | |
1899 | } | |
1900 | ||
35464483 JO |
1901 | /** |
1902 | * vmbus_allocate_mmio() - Pick a memory-mapped I/O range. | |
1903 | * @new: If successful, supplied a pointer to the | |
1904 | * allocated MMIO space. | |
1905 | * @device_obj: Identifies the caller | |
1906 | * @min: Minimum guest physical address of the | |
1907 | * allocation | |
1908 | * @max: Maximum guest physical address | |
1909 | * @size: Size of the range to be allocated | |
1910 | * @align: Alignment of the range to be allocated | |
1911 | * @fb_overlap_ok: Whether this allocation can be allowed | |
1912 | * to overlap the video frame buffer. | |
1913 | * | |
1914 | * This function walks the resources granted to VMBus by the | |
1915 | * _CRS object in the ACPI namespace underneath the parent | |
1916 | * "bridge" whether that's a root PCI bus in the Generation 1 | |
1917 | * case or a Module Device in the Generation 2 case. It then | |
1918 | * attempts to allocate from the global MMIO pool in a way that | |
1919 | * matches the constraints supplied in these parameters and by | |
1920 | * that _CRS. | |
1921 | * | |
1922 | * Return: 0 on success, -errno on failure | |
1923 | */ | |
1924 | int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj, | |
1925 | resource_size_t min, resource_size_t max, | |
1926 | resource_size_t size, resource_size_t align, | |
1927 | bool fb_overlap_ok) | |
1928 | { | |
be000f93 | 1929 | struct resource *iter, *shadow; |
ea37a6b8 | 1930 | resource_size_t range_min, range_max, start; |
35464483 | 1931 | const char *dev_n = dev_name(&device_obj->device); |
ea37a6b8 | 1932 | int retval; |
e16dad6b JO |
1933 | |
1934 | retval = -ENXIO; | |
1935 | down(&hyperv_mmio_lock); | |
35464483 | 1936 | |
ea37a6b8 JO |
1937 | /* |
1938 | * If overlaps with frame buffers are allowed, then first attempt to | |
1939 | * make the allocation from within the reserved region. Because it | |
1940 | * is already reserved, no shadow allocation is necessary. | |
1941 | */ | |
1942 | if (fb_overlap_ok && fb_mmio && !(min > fb_mmio->end) && | |
1943 | !(max < fb_mmio->start)) { | |
1944 | ||
1945 | range_min = fb_mmio->start; | |
1946 | range_max = fb_mmio->end; | |
1947 | start = (range_min + align - 1) & ~(align - 1); | |
1948 | for (; start + size - 1 <= range_max; start += align) { | |
1949 | *new = request_mem_region_exclusive(start, size, dev_n); | |
1950 | if (*new) { | |
1951 | retval = 0; | |
1952 | goto exit; | |
1953 | } | |
1954 | } | |
1955 | } | |
1956 | ||
35464483 JO |
1957 | for (iter = hyperv_mmio; iter; iter = iter->sibling) { |
1958 | if ((iter->start >= max) || (iter->end <= min)) | |
1959 | continue; | |
1960 | ||
1961 | range_min = iter->start; | |
1962 | range_max = iter->end; | |
ea37a6b8 JO |
1963 | start = (range_min + align - 1) & ~(align - 1); |
1964 | for (; start + size - 1 <= range_max; start += align) { | |
1965 | shadow = __request_region(iter, start, size, NULL, | |
1966 | IORESOURCE_BUSY); | |
1967 | if (!shadow) | |
1968 | continue; | |
1969 | ||
1970 | *new = request_mem_region_exclusive(start, size, dev_n); | |
1971 | if (*new) { | |
1972 | shadow->name = (char *)*new; | |
1973 | retval = 0; | |
1974 | goto exit; | |
35464483 JO |
1975 | } |
1976 | ||
ea37a6b8 | 1977 | __release_region(iter, start, size); |
35464483 JO |
1978 | } |
1979 | } | |
1980 | ||
e16dad6b JO |
1981 | exit: |
1982 | up(&hyperv_mmio_lock); | |
1983 | return retval; | |
35464483 JO |
1984 | } |
1985 | EXPORT_SYMBOL_GPL(vmbus_allocate_mmio); | |
1986 | ||
97fb77dc JO |
1987 | /** |
1988 | * vmbus_free_mmio() - Free a memory-mapped I/O range. | |
1989 | * @start: Base address of region to release. | |
1990 | * @size: Size of the range to be allocated | |
1991 | * | |
1992 | * This function releases anything requested by | |
1993 | * vmbus_mmio_allocate(). | |
1994 | */ | |
1995 | void vmbus_free_mmio(resource_size_t start, resource_size_t size) | |
1996 | { | |
be000f93 JO |
1997 | struct resource *iter; |
1998 | ||
1999 | down(&hyperv_mmio_lock); | |
2000 | for (iter = hyperv_mmio; iter; iter = iter->sibling) { | |
2001 | if ((iter->start >= start + size) || (iter->end <= start)) | |
2002 | continue; | |
2003 | ||
2004 | __release_region(iter, start, size); | |
2005 | } | |
97fb77dc | 2006 | release_mem_region(start, size); |
be000f93 | 2007 | up(&hyperv_mmio_lock); |
97fb77dc JO |
2008 | |
2009 | } | |
2010 | EXPORT_SYMBOL_GPL(vmbus_free_mmio); | |
2011 | ||
b0069f43 S |
2012 | static int vmbus_acpi_add(struct acpi_device *device) |
2013 | { | |
2014 | acpi_status result; | |
90f34535 | 2015 | int ret_val = -ENODEV; |
7f163a6f | 2016 | struct acpi_device *ancestor; |
b0069f43 | 2017 | |
607c1a11 S |
2018 | hv_acpi_dev = device; |
2019 | ||
0a4425b6 | 2020 | result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
90f34535 | 2021 | vmbus_walk_resources, NULL); |
b0069f43 | 2022 | |
90f34535 S |
2023 | if (ACPI_FAILURE(result)) |
2024 | goto acpi_walk_err; | |
2025 | /* | |
7f163a6f JO |
2026 | * Some ancestor of the vmbus acpi device (Gen1 or Gen2 |
2027 | * firmware) is the VMOD that has the mmio ranges. Get that. | |
90f34535 | 2028 | */ |
7f163a6f JO |
2029 | for (ancestor = device->parent; ancestor; ancestor = ancestor->parent) { |
2030 | result = acpi_walk_resources(ancestor->handle, METHOD_NAME__CRS, | |
2031 | vmbus_walk_resources, NULL); | |
90f34535 S |
2032 | |
2033 | if (ACPI_FAILURE(result)) | |
7f163a6f | 2034 | continue; |
6d146aef JO |
2035 | if (hyperv_mmio) { |
2036 | vmbus_reserve_fb(); | |
7f163a6f | 2037 | break; |
6d146aef | 2038 | } |
b0069f43 | 2039 | } |
90f34535 S |
2040 | ret_val = 0; |
2041 | ||
2042 | acpi_walk_err: | |
b0069f43 | 2043 | complete(&probe_event); |
7f163a6f JO |
2044 | if (ret_val) |
2045 | vmbus_acpi_remove(device); | |
90f34535 | 2046 | return ret_val; |
b0069f43 S |
2047 | } |
2048 | ||
2049 | static const struct acpi_device_id vmbus_acpi_device_ids[] = { | |
2050 | {"VMBUS", 0}, | |
9d7b18d1 | 2051 | {"VMBus", 0}, |
b0069f43 S |
2052 | {"", 0}, |
2053 | }; | |
2054 | MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); | |
2055 | ||
2056 | static struct acpi_driver vmbus_acpi_driver = { | |
2057 | .name = "vmbus", | |
2058 | .ids = vmbus_acpi_device_ids, | |
2059 | .ops = { | |
2060 | .add = vmbus_acpi_add, | |
e4ecb41c | 2061 | .remove = vmbus_acpi_remove, |
b0069f43 S |
2062 | }, |
2063 | }; | |
2064 | ||
2517281d VK |
2065 | static void hv_kexec_handler(void) |
2066 | { | |
2517281d | 2067 | hv_synic_clockevents_cleanup(); |
75ff3a8a | 2068 | vmbus_initiate_unload(false); |
523b9408 VK |
2069 | vmbus_connection.conn_state = DISCONNECTED; |
2070 | /* Make sure conn_state is set as hv_synic_cleanup checks for it */ | |
2071 | mb(); | |
76d36ab7 | 2072 | cpuhp_remove_state(hyperv_cpuhp_online); |
d6f3609d | 2073 | hyperv_cleanup(); |
2517281d VK |
2074 | }; |
2075 | ||
b4370df2 VK |
2076 | static void hv_crash_handler(struct pt_regs *regs) |
2077 | { | |
75ff3a8a | 2078 | vmbus_initiate_unload(true); |
b4370df2 VK |
2079 | /* |
2080 | * In crash handler we can't schedule synic cleanup for all CPUs, | |
2081 | * doing the cleanup for current CPU only. This should be sufficient | |
2082 | * for kdump. | |
2083 | */ | |
523b9408 | 2084 | vmbus_connection.conn_state = DISCONNECTED; |
76d36ab7 | 2085 | hv_synic_cleanup(smp_processor_id()); |
d6f3609d | 2086 | hyperv_cleanup(); |
b4370df2 VK |
2087 | }; |
2088 | ||
607c1a11 | 2089 | static int __init hv_acpi_init(void) |
1168ac22 | 2090 | { |
2dda95f8 | 2091 | int ret, t; |
b0069f43 | 2092 | |
4a5f3cde | 2093 | if (!hv_is_hyperv_initialized()) |
0592969e JW |
2094 | return -ENODEV; |
2095 | ||
b0069f43 S |
2096 | init_completion(&probe_event); |
2097 | ||
2098 | /* | |
efc26722 | 2099 | * Get ACPI resources first. |
b0069f43 | 2100 | */ |
0246604c S |
2101 | ret = acpi_bus_register_driver(&vmbus_acpi_driver); |
2102 | ||
b0069f43 S |
2103 | if (ret) |
2104 | return ret; | |
2105 | ||
2dda95f8 S |
2106 | t = wait_for_completion_timeout(&probe_event, 5*HZ); |
2107 | if (t == 0) { | |
2108 | ret = -ETIMEDOUT; | |
2109 | goto cleanup; | |
2110 | } | |
b0069f43 | 2111 | |
efc26722 | 2112 | ret = vmbus_bus_init(); |
91fd799e | 2113 | if (ret) |
2dda95f8 S |
2114 | goto cleanup; |
2115 | ||
2517281d | 2116 | hv_setup_kexec_handler(hv_kexec_handler); |
b4370df2 | 2117 | hv_setup_crash_handler(hv_crash_handler); |
2517281d | 2118 | |
2dda95f8 S |
2119 | return 0; |
2120 | ||
2121 | cleanup: | |
2122 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
cf6a2eac | 2123 | hv_acpi_dev = NULL; |
91fd799e | 2124 | return ret; |
1168ac22 S |
2125 | } |
2126 | ||
93e5bd06 S |
2127 | static void __exit vmbus_exit(void) |
2128 | { | |
e72e7ac5 VK |
2129 | int cpu; |
2130 | ||
2517281d | 2131 | hv_remove_kexec_handler(); |
b4370df2 | 2132 | hv_remove_crash_handler(); |
09a19628 | 2133 | vmbus_connection.conn_state = DISCONNECTED; |
e086748c | 2134 | hv_synic_clockevents_cleanup(); |
2db84eff | 2135 | vmbus_disconnect(); |
76d388cd | 2136 | hv_remove_vmbus_irq(); |
37cdd991 SH |
2137 | for_each_online_cpu(cpu) { |
2138 | struct hv_per_cpu_context *hv_cpu | |
2139 | = per_cpu_ptr(hv_context.cpu_context, cpu); | |
2140 | ||
2141 | tasklet_kill(&hv_cpu->msg_dpc); | |
2142 | } | |
93e5bd06 | 2143 | vmbus_free_channels(); |
37cdd991 | 2144 | |
cc2dd402 | 2145 | if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) { |
81b18bce | 2146 | kmsg_dump_unregister(&hv_kmsg_dumper); |
510f7aef | 2147 | unregister_die_notifier(&hyperv_die_block); |
096c605f VK |
2148 | atomic_notifier_chain_unregister(&panic_notifier_list, |
2149 | &hyperv_panic_block); | |
2150 | } | |
81b18bce SM |
2151 | |
2152 | free_page((unsigned long)hv_panic_page); | |
8afc06dd SM |
2153 | unregister_sysctl_table(hv_ctl_table_hdr); |
2154 | hv_ctl_table_hdr = NULL; | |
93e5bd06 | 2155 | bus_unregister(&hv_bus); |
37cdd991 | 2156 | |
76d36ab7 | 2157 | cpuhp_remove_state(hyperv_cpuhp_online); |
06210b42 | 2158 | hv_synic_free(); |
93e5bd06 S |
2159 | acpi_bus_unregister_driver(&vmbus_acpi_driver); |
2160 | } | |
2161 | ||
1168ac22 | 2162 | |
90c9960e | 2163 | MODULE_LICENSE("GPL"); |
3e7ee490 | 2164 | |
43d4e119 | 2165 | subsys_initcall(hv_acpi_init); |
93e5bd06 | 2166 | module_exit(vmbus_exit); |