Commit | Line | Data |
---|---|---|
3e7ee490 | 1 | /* |
3e7ee490 HJ |
2 | * Copyright (c) 2009, Microsoft Corporation. |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
16 | * | |
17 | * Authors: | |
18 | * Haiyang Zhang <haiyangz@microsoft.com> | |
19 | * Hank Janssen <hjanssen@microsoft.com> | |
b0069f43 | 20 | * K. Y. Srinivasan <kys@microsoft.com> |
52e5c1ce | 21 | * |
3e7ee490 | 22 | */ |
0a46618d HJ |
23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
24 | ||
3e7ee490 HJ |
25 | #include <linux/init.h> |
26 | #include <linux/module.h> | |
27 | #include <linux/device.h> | |
3e7ee490 HJ |
28 | #include <linux/interrupt.h> |
29 | #include <linux/sysctl.h> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
b0069f43 | 31 | #include <linux/acpi.h> |
8b5d6d3b | 32 | #include <linux/completion.h> |
46a97191 | 33 | #include <linux/hyperv.h> |
b0209501 | 34 | #include <linux/kernel_stat.h> |
4061ed9e | 35 | #include <linux/clockchips.h> |
e513229b | 36 | #include <linux/cpu.h> |
407dd164 | 37 | #include <asm/hyperv.h> |
1f94ea81 | 38 | #include <asm/hypervisor.h> |
302a3c0f | 39 | #include <asm/mshyperv.h> |
96c1d058 NM |
40 | #include <linux/notifier.h> |
41 | #include <linux/ptrace.h> | |
35464483 | 42 | #include <linux/screen_info.h> |
510f7aef | 43 | #include <linux/kdebug.h> |
0f2a6619 | 44 | #include "hyperv_vmbus.h" |
3e7ee490 | 45 | |
607c1a11 | 46 | static struct acpi_device *hv_acpi_dev; |
1168ac22 | 47 | |
59c0e4f0 | 48 | static struct tasklet_struct msg_dpc; |
71a6655d | 49 | static struct completion probe_event; |
b0069f43 | 50 | static int irq; |
98db4335 | 51 | |
96c1d058 | 52 | |
510f7aef | 53 | static void hyperv_report_panic(struct pt_regs *regs) |
96c1d058 | 54 | { |
510f7aef | 55 | static bool panic_reported; |
96c1d058 | 56 | |
510f7aef VK |
57 | /* |
58 | * We prefer to report panic on 'die' chain as we have proper | |
59 | * registers to report, but if we miss it (e.g. on BUG()) we need | |
60 | * to report it on 'panic'. | |
61 | */ | |
62 | if (panic_reported) | |
63 | return; | |
64 | panic_reported = true; | |
96c1d058 NM |
65 | |
66 | wrmsrl(HV_X64_MSR_CRASH_P0, regs->ip); | |
67 | wrmsrl(HV_X64_MSR_CRASH_P1, regs->ax); | |
68 | wrmsrl(HV_X64_MSR_CRASH_P2, regs->bx); | |
69 | wrmsrl(HV_X64_MSR_CRASH_P3, regs->cx); | |
70 | wrmsrl(HV_X64_MSR_CRASH_P4, regs->dx); | |
71 | ||
72 | /* | |
73 | * Let Hyper-V know there is crash data available | |
74 | */ | |
75 | wrmsrl(HV_X64_MSR_CRASH_CTL, HV_CRASH_CTL_CRASH_NOTIFY); | |
510f7aef VK |
76 | } |
77 | ||
78 | static int hyperv_panic_event(struct notifier_block *nb, unsigned long val, | |
79 | void *args) | |
80 | { | |
81 | struct pt_regs *regs; | |
82 | ||
83 | regs = current_pt_regs(); | |
84 | ||
85 | hyperv_report_panic(regs); | |
96c1d058 NM |
86 | return NOTIFY_DONE; |
87 | } | |
88 | ||
510f7aef VK |
89 | static int hyperv_die_event(struct notifier_block *nb, unsigned long val, |
90 | void *args) | |
91 | { | |
92 | struct die_args *die = (struct die_args *)args; | |
93 | struct pt_regs *regs = die->regs; | |
94 | ||
95 | hyperv_report_panic(regs); | |
96 | return NOTIFY_DONE; | |
97 | } | |
98 | ||
99 | static struct notifier_block hyperv_die_block = { | |
100 | .notifier_call = hyperv_die_event, | |
101 | }; | |
96c1d058 NM |
102 | static struct notifier_block hyperv_panic_block = { |
103 | .notifier_call = hyperv_panic_event, | |
104 | }; | |
105 | ||
7f163a6f | 106 | struct resource *hyperv_mmio; |
98db4335 | 107 | |
cf6a2eac S |
108 | static int vmbus_exists(void) |
109 | { | |
110 | if (hv_acpi_dev == NULL) | |
111 | return -ENODEV; | |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
fd776ba9 OH |
116 | #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2) |
117 | static void print_alias_name(struct hv_device *hv_dev, char *alias_name) | |
118 | { | |
119 | int i; | |
120 | for (i = 0; i < VMBUS_ALIAS_LEN; i += 2) | |
121 | sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]); | |
122 | } | |
123 | ||
76c52bbe GKH |
124 | static u8 channel_monitor_group(struct vmbus_channel *channel) |
125 | { | |
126 | return (u8)channel->offermsg.monitorid / 32; | |
127 | } | |
128 | ||
129 | static u8 channel_monitor_offset(struct vmbus_channel *channel) | |
130 | { | |
131 | return (u8)channel->offermsg.monitorid % 32; | |
132 | } | |
133 | ||
134 | static u32 channel_pending(struct vmbus_channel *channel, | |
135 | struct hv_monitor_page *monitor_page) | |
136 | { | |
137 | u8 monitor_group = channel_monitor_group(channel); | |
138 | return monitor_page->trigger_group[monitor_group].pending; | |
139 | } | |
140 | ||
1cee272b GKH |
141 | static u32 channel_latency(struct vmbus_channel *channel, |
142 | struct hv_monitor_page *monitor_page) | |
143 | { | |
144 | u8 monitor_group = channel_monitor_group(channel); | |
145 | u8 monitor_offset = channel_monitor_offset(channel); | |
146 | return monitor_page->latency[monitor_group][monitor_offset]; | |
147 | } | |
148 | ||
4947c745 GKH |
149 | static u32 channel_conn_id(struct vmbus_channel *channel, |
150 | struct hv_monitor_page *monitor_page) | |
151 | { | |
152 | u8 monitor_group = channel_monitor_group(channel); | |
153 | u8 monitor_offset = channel_monitor_offset(channel); | |
154 | return monitor_page->parameter[monitor_group][monitor_offset].connectionid.u.id; | |
155 | } | |
156 | ||
03f3a910 GKH |
157 | static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr, |
158 | char *buf) | |
159 | { | |
160 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
161 | ||
162 | if (!hv_dev->channel) | |
163 | return -ENODEV; | |
164 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid); | |
165 | } | |
166 | static DEVICE_ATTR_RO(id); | |
167 | ||
a8fb5f3d GKH |
168 | static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr, |
169 | char *buf) | |
170 | { | |
171 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
172 | ||
173 | if (!hv_dev->channel) | |
174 | return -ENODEV; | |
175 | return sprintf(buf, "%d\n", hv_dev->channel->state); | |
176 | } | |
177 | static DEVICE_ATTR_RO(state); | |
178 | ||
5ffd00e2 GKH |
179 | static ssize_t monitor_id_show(struct device *dev, |
180 | struct device_attribute *dev_attr, char *buf) | |
181 | { | |
182 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
183 | ||
184 | if (!hv_dev->channel) | |
185 | return -ENODEV; | |
186 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.monitorid); | |
187 | } | |
188 | static DEVICE_ATTR_RO(monitor_id); | |
189 | ||
68234c04 GKH |
190 | static ssize_t class_id_show(struct device *dev, |
191 | struct device_attribute *dev_attr, char *buf) | |
192 | { | |
193 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
194 | ||
195 | if (!hv_dev->channel) | |
196 | return -ENODEV; | |
197 | return sprintf(buf, "{%pUl}\n", | |
198 | hv_dev->channel->offermsg.offer.if_type.b); | |
199 | } | |
200 | static DEVICE_ATTR_RO(class_id); | |
201 | ||
7c55e1d0 GKH |
202 | static ssize_t device_id_show(struct device *dev, |
203 | struct device_attribute *dev_attr, char *buf) | |
204 | { | |
205 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
206 | ||
207 | if (!hv_dev->channel) | |
208 | return -ENODEV; | |
209 | return sprintf(buf, "{%pUl}\n", | |
210 | hv_dev->channel->offermsg.offer.if_instance.b); | |
211 | } | |
212 | static DEVICE_ATTR_RO(device_id); | |
213 | ||
647fa371 GKH |
214 | static ssize_t modalias_show(struct device *dev, |
215 | struct device_attribute *dev_attr, char *buf) | |
216 | { | |
217 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
218 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
219 | ||
220 | print_alias_name(hv_dev, alias_name); | |
221 | return sprintf(buf, "vmbus:%s\n", alias_name); | |
222 | } | |
223 | static DEVICE_ATTR_RO(modalias); | |
224 | ||
76c52bbe GKH |
225 | static ssize_t server_monitor_pending_show(struct device *dev, |
226 | struct device_attribute *dev_attr, | |
227 | char *buf) | |
228 | { | |
229 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
230 | ||
231 | if (!hv_dev->channel) | |
232 | return -ENODEV; | |
233 | return sprintf(buf, "%d\n", | |
234 | channel_pending(hv_dev->channel, | |
235 | vmbus_connection.monitor_pages[1])); | |
236 | } | |
237 | static DEVICE_ATTR_RO(server_monitor_pending); | |
238 | ||
239 | static ssize_t client_monitor_pending_show(struct device *dev, | |
240 | struct device_attribute *dev_attr, | |
241 | char *buf) | |
242 | { | |
243 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
244 | ||
245 | if (!hv_dev->channel) | |
246 | return -ENODEV; | |
247 | return sprintf(buf, "%d\n", | |
248 | channel_pending(hv_dev->channel, | |
249 | vmbus_connection.monitor_pages[1])); | |
250 | } | |
251 | static DEVICE_ATTR_RO(client_monitor_pending); | |
68234c04 | 252 | |
1cee272b GKH |
253 | static ssize_t server_monitor_latency_show(struct device *dev, |
254 | struct device_attribute *dev_attr, | |
255 | char *buf) | |
256 | { | |
257 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
258 | ||
259 | if (!hv_dev->channel) | |
260 | return -ENODEV; | |
261 | return sprintf(buf, "%d\n", | |
262 | channel_latency(hv_dev->channel, | |
263 | vmbus_connection.monitor_pages[0])); | |
264 | } | |
265 | static DEVICE_ATTR_RO(server_monitor_latency); | |
266 | ||
267 | static ssize_t client_monitor_latency_show(struct device *dev, | |
268 | struct device_attribute *dev_attr, | |
269 | char *buf) | |
270 | { | |
271 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
272 | ||
273 | if (!hv_dev->channel) | |
274 | return -ENODEV; | |
275 | return sprintf(buf, "%d\n", | |
276 | channel_latency(hv_dev->channel, | |
277 | vmbus_connection.monitor_pages[1])); | |
278 | } | |
279 | static DEVICE_ATTR_RO(client_monitor_latency); | |
280 | ||
4947c745 GKH |
281 | static ssize_t server_monitor_conn_id_show(struct device *dev, |
282 | struct device_attribute *dev_attr, | |
283 | char *buf) | |
284 | { | |
285 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
286 | ||
287 | if (!hv_dev->channel) | |
288 | return -ENODEV; | |
289 | return sprintf(buf, "%d\n", | |
290 | channel_conn_id(hv_dev->channel, | |
291 | vmbus_connection.monitor_pages[0])); | |
292 | } | |
293 | static DEVICE_ATTR_RO(server_monitor_conn_id); | |
294 | ||
295 | static ssize_t client_monitor_conn_id_show(struct device *dev, | |
296 | struct device_attribute *dev_attr, | |
297 | char *buf) | |
298 | { | |
299 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
300 | ||
301 | if (!hv_dev->channel) | |
302 | return -ENODEV; | |
303 | return sprintf(buf, "%d\n", | |
304 | channel_conn_id(hv_dev->channel, | |
305 | vmbus_connection.monitor_pages[1])); | |
306 | } | |
307 | static DEVICE_ATTR_RO(client_monitor_conn_id); | |
308 | ||
98f4c651 GKH |
309 | static ssize_t out_intr_mask_show(struct device *dev, |
310 | struct device_attribute *dev_attr, char *buf) | |
311 | { | |
312 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
313 | struct hv_ring_buffer_debug_info outbound; | |
314 | ||
315 | if (!hv_dev->channel) | |
316 | return -ENODEV; | |
317 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
318 | return sprintf(buf, "%d\n", outbound.current_interrupt_mask); | |
319 | } | |
320 | static DEVICE_ATTR_RO(out_intr_mask); | |
321 | ||
322 | static ssize_t out_read_index_show(struct device *dev, | |
323 | struct device_attribute *dev_attr, char *buf) | |
324 | { | |
325 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
326 | struct hv_ring_buffer_debug_info outbound; | |
327 | ||
328 | if (!hv_dev->channel) | |
329 | return -ENODEV; | |
330 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
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; | |
341 | ||
342 | if (!hv_dev->channel) | |
343 | return -ENODEV; | |
344 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
345 | return sprintf(buf, "%d\n", outbound.current_write_index); | |
346 | } | |
347 | static DEVICE_ATTR_RO(out_write_index); | |
348 | ||
349 | static ssize_t out_read_bytes_avail_show(struct device *dev, | |
350 | struct device_attribute *dev_attr, | |
351 | char *buf) | |
352 | { | |
353 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
354 | struct hv_ring_buffer_debug_info outbound; | |
355 | ||
356 | if (!hv_dev->channel) | |
357 | return -ENODEV; | |
358 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
359 | return sprintf(buf, "%d\n", outbound.bytes_avail_toread); | |
360 | } | |
361 | static DEVICE_ATTR_RO(out_read_bytes_avail); | |
362 | ||
363 | static ssize_t out_write_bytes_avail_show(struct device *dev, | |
364 | struct device_attribute *dev_attr, | |
365 | char *buf) | |
366 | { | |
367 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
368 | struct hv_ring_buffer_debug_info outbound; | |
369 | ||
370 | if (!hv_dev->channel) | |
371 | return -ENODEV; | |
372 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
373 | return sprintf(buf, "%d\n", outbound.bytes_avail_towrite); | |
374 | } | |
375 | static DEVICE_ATTR_RO(out_write_bytes_avail); | |
376 | ||
377 | static ssize_t in_intr_mask_show(struct device *dev, | |
378 | struct device_attribute *dev_attr, char *buf) | |
379 | { | |
380 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
381 | struct hv_ring_buffer_debug_info inbound; | |
382 | ||
383 | if (!hv_dev->channel) | |
384 | return -ENODEV; | |
385 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
386 | return sprintf(buf, "%d\n", inbound.current_interrupt_mask); | |
387 | } | |
388 | static DEVICE_ATTR_RO(in_intr_mask); | |
389 | ||
390 | static ssize_t in_read_index_show(struct device *dev, | |
391 | struct device_attribute *dev_attr, char *buf) | |
392 | { | |
393 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
394 | struct hv_ring_buffer_debug_info inbound; | |
395 | ||
396 | if (!hv_dev->channel) | |
397 | return -ENODEV; | |
398 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
399 | return sprintf(buf, "%d\n", inbound.current_read_index); | |
400 | } | |
401 | static DEVICE_ATTR_RO(in_read_index); | |
402 | ||
403 | static ssize_t in_write_index_show(struct device *dev, | |
404 | struct device_attribute *dev_attr, char *buf) | |
405 | { | |
406 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
407 | struct hv_ring_buffer_debug_info inbound; | |
408 | ||
409 | if (!hv_dev->channel) | |
410 | return -ENODEV; | |
411 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
412 | return sprintf(buf, "%d\n", inbound.current_write_index); | |
413 | } | |
414 | static DEVICE_ATTR_RO(in_write_index); | |
415 | ||
416 | static ssize_t in_read_bytes_avail_show(struct device *dev, | |
417 | struct device_attribute *dev_attr, | |
418 | char *buf) | |
419 | { | |
420 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
421 | struct hv_ring_buffer_debug_info inbound; | |
422 | ||
423 | if (!hv_dev->channel) | |
424 | return -ENODEV; | |
425 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
426 | return sprintf(buf, "%d\n", inbound.bytes_avail_toread); | |
427 | } | |
428 | static DEVICE_ATTR_RO(in_read_bytes_avail); | |
429 | ||
430 | static ssize_t in_write_bytes_avail_show(struct device *dev, | |
431 | struct device_attribute *dev_attr, | |
432 | char *buf) | |
433 | { | |
434 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
435 | struct hv_ring_buffer_debug_info inbound; | |
436 | ||
437 | if (!hv_dev->channel) | |
438 | return -ENODEV; | |
439 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
440 | return sprintf(buf, "%d\n", inbound.bytes_avail_towrite); | |
441 | } | |
442 | static DEVICE_ATTR_RO(in_write_bytes_avail); | |
443 | ||
042ab031 DC |
444 | static ssize_t channel_vp_mapping_show(struct device *dev, |
445 | struct device_attribute *dev_attr, | |
446 | char *buf) | |
447 | { | |
448 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
449 | struct vmbus_channel *channel = hv_dev->channel, *cur_sc; | |
450 | unsigned long flags; | |
451 | int buf_size = PAGE_SIZE, n_written, tot_written; | |
452 | struct list_head *cur; | |
453 | ||
454 | if (!channel) | |
455 | return -ENODEV; | |
456 | ||
457 | tot_written = snprintf(buf, buf_size, "%u:%u\n", | |
458 | channel->offermsg.child_relid, channel->target_cpu); | |
459 | ||
460 | spin_lock_irqsave(&channel->lock, flags); | |
461 | ||
462 | list_for_each(cur, &channel->sc_list) { | |
463 | if (tot_written >= buf_size - 1) | |
464 | break; | |
465 | ||
466 | cur_sc = list_entry(cur, struct vmbus_channel, sc_list); | |
467 | n_written = scnprintf(buf + tot_written, | |
468 | buf_size - tot_written, | |
469 | "%u:%u\n", | |
470 | cur_sc->offermsg.child_relid, | |
471 | cur_sc->target_cpu); | |
472 | tot_written += n_written; | |
473 | } | |
474 | ||
475 | spin_unlock_irqrestore(&channel->lock, flags); | |
476 | ||
477 | return tot_written; | |
478 | } | |
479 | static DEVICE_ATTR_RO(channel_vp_mapping); | |
480 | ||
98f4c651 | 481 | /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ |
03f3a910 GKH |
482 | static struct attribute *vmbus_attrs[] = { |
483 | &dev_attr_id.attr, | |
a8fb5f3d | 484 | &dev_attr_state.attr, |
5ffd00e2 | 485 | &dev_attr_monitor_id.attr, |
68234c04 | 486 | &dev_attr_class_id.attr, |
7c55e1d0 | 487 | &dev_attr_device_id.attr, |
647fa371 | 488 | &dev_attr_modalias.attr, |
76c52bbe GKH |
489 | &dev_attr_server_monitor_pending.attr, |
490 | &dev_attr_client_monitor_pending.attr, | |
1cee272b GKH |
491 | &dev_attr_server_monitor_latency.attr, |
492 | &dev_attr_client_monitor_latency.attr, | |
4947c745 GKH |
493 | &dev_attr_server_monitor_conn_id.attr, |
494 | &dev_attr_client_monitor_conn_id.attr, | |
98f4c651 GKH |
495 | &dev_attr_out_intr_mask.attr, |
496 | &dev_attr_out_read_index.attr, | |
497 | &dev_attr_out_write_index.attr, | |
498 | &dev_attr_out_read_bytes_avail.attr, | |
499 | &dev_attr_out_write_bytes_avail.attr, | |
500 | &dev_attr_in_intr_mask.attr, | |
501 | &dev_attr_in_read_index.attr, | |
502 | &dev_attr_in_write_index.attr, | |
503 | &dev_attr_in_read_bytes_avail.attr, | |
504 | &dev_attr_in_write_bytes_avail.attr, | |
042ab031 | 505 | &dev_attr_channel_vp_mapping.attr, |
03f3a910 GKH |
506 | NULL, |
507 | }; | |
508 | ATTRIBUTE_GROUPS(vmbus); | |
509 | ||
adde2487 S |
510 | /* |
511 | * vmbus_uevent - add uevent for our device | |
512 | * | |
513 | * This routine is invoked when a device is added or removed on the vmbus to | |
514 | * generate a uevent to udev in the userspace. The udev will then look at its | |
515 | * rule and the uevent generated here to load the appropriate driver | |
0ddda660 S |
516 | * |
517 | * The alias string will be of the form vmbus:guid where guid is the string | |
518 | * representation of the device guid (each byte of the guid will be | |
519 | * represented with two hex characters. | |
adde2487 S |
520 | */ |
521 | static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) | |
522 | { | |
523 | struct hv_device *dev = device_to_hv_device(device); | |
fd776ba9 OH |
524 | int ret; |
525 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
0ddda660 | 526 | |
fd776ba9 | 527 | print_alias_name(dev, alias_name); |
0ddda660 S |
528 | ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); |
529 | return ret; | |
adde2487 S |
530 | } |
531 | ||
1b9d48f2 | 532 | static const uuid_le null_guid; |
5841a829 S |
533 | |
534 | static inline bool is_null_guid(const __u8 *guid) | |
535 | { | |
536 | if (memcmp(guid, &null_guid, sizeof(uuid_le))) | |
537 | return false; | |
538 | return true; | |
539 | } | |
540 | ||
3037a7b6 S |
541 | /* |
542 | * Return a matching hv_vmbus_device_id pointer. | |
543 | * If there is no match, return NULL. | |
544 | */ | |
545 | static const struct hv_vmbus_device_id *hv_vmbus_get_id( | |
546 | const struct hv_vmbus_device_id *id, | |
1b9d48f2 | 547 | const __u8 *guid) |
3037a7b6 S |
548 | { |
549 | for (; !is_null_guid(id->guid); id++) | |
550 | if (!memcmp(&id->guid, guid, sizeof(uuid_le))) | |
551 | return id; | |
552 | ||
553 | return NULL; | |
554 | } | |
555 | ||
556 | ||
b7fc147b S |
557 | |
558 | /* | |
559 | * vmbus_match - Attempt to match the specified device to the specified driver | |
560 | */ | |
561 | static int vmbus_match(struct device *device, struct device_driver *driver) | |
562 | { | |
b7fc147b | 563 | struct hv_driver *drv = drv_to_hv_drv(driver); |
e8e27047 | 564 | struct hv_device *hv_dev = device_to_hv_device(device); |
b7fc147b | 565 | |
3037a7b6 S |
566 | if (hv_vmbus_get_id(drv->id_table, hv_dev->dev_type.b)) |
567 | return 1; | |
de632a2b | 568 | |
5841a829 | 569 | return 0; |
b7fc147b S |
570 | } |
571 | ||
f1f0d67b S |
572 | /* |
573 | * vmbus_probe - Add the new vmbus's child device | |
574 | */ | |
575 | static int vmbus_probe(struct device *child_device) | |
576 | { | |
577 | int ret = 0; | |
578 | struct hv_driver *drv = | |
579 | drv_to_hv_drv(child_device->driver); | |
9efd21e1 | 580 | struct hv_device *dev = device_to_hv_device(child_device); |
84946899 | 581 | const struct hv_vmbus_device_id *dev_id; |
f1f0d67b | 582 | |
84946899 | 583 | dev_id = hv_vmbus_get_id(drv->id_table, dev->dev_type.b); |
9efd21e1 | 584 | if (drv->probe) { |
84946899 | 585 | ret = drv->probe(dev, dev_id); |
b14a7b30 | 586 | if (ret != 0) |
0a46618d HJ |
587 | pr_err("probe failed for device %s (%d)\n", |
588 | dev_name(child_device), ret); | |
f1f0d67b | 589 | |
f1f0d67b | 590 | } else { |
0a46618d HJ |
591 | pr_err("probe not set for driver %s\n", |
592 | dev_name(child_device)); | |
6de925b1 | 593 | ret = -ENODEV; |
f1f0d67b S |
594 | } |
595 | return ret; | |
596 | } | |
597 | ||
c5dce3db S |
598 | /* |
599 | * vmbus_remove - Remove a vmbus device | |
600 | */ | |
601 | static int vmbus_remove(struct device *child_device) | |
602 | { | |
d15a0301 | 603 | struct hv_driver *drv; |
415b023a | 604 | struct hv_device *dev = device_to_hv_device(child_device); |
ed6cfcc5 | 605 | u32 relid = dev->channel->offermsg.child_relid; |
c5dce3db | 606 | |
d15a0301 S |
607 | if (child_device->driver) { |
608 | drv = drv_to_hv_drv(child_device->driver); | |
609 | if (drv->remove) | |
610 | drv->remove(dev); | |
ed6cfcc5 S |
611 | else { |
612 | hv_process_channel_removal(dev->channel, relid); | |
d15a0301 S |
613 | pr_err("remove not set for driver %s\n", |
614 | dev_name(child_device)); | |
ed6cfcc5 S |
615 | } |
616 | } else { | |
617 | /* | |
618 | * We don't have a driver for this device; deal with the | |
619 | * rescind message by removing the channel. | |
620 | */ | |
621 | hv_process_channel_removal(dev->channel, relid); | |
d15a0301 | 622 | } |
c5dce3db S |
623 | |
624 | return 0; | |
625 | } | |
626 | ||
eb1bb259 S |
627 | |
628 | /* | |
629 | * vmbus_shutdown - Shutdown a vmbus device | |
630 | */ | |
631 | static void vmbus_shutdown(struct device *child_device) | |
632 | { | |
633 | struct hv_driver *drv; | |
ca6887fb | 634 | struct hv_device *dev = device_to_hv_device(child_device); |
eb1bb259 S |
635 | |
636 | ||
637 | /* The device may not be attached yet */ | |
638 | if (!child_device->driver) | |
639 | return; | |
640 | ||
641 | drv = drv_to_hv_drv(child_device->driver); | |
642 | ||
ca6887fb S |
643 | if (drv->shutdown) |
644 | drv->shutdown(dev); | |
eb1bb259 S |
645 | |
646 | return; | |
647 | } | |
648 | ||
086e7a56 S |
649 | |
650 | /* | |
651 | * vmbus_device_release - Final callback release of the vmbus child device | |
652 | */ | |
653 | static void vmbus_device_release(struct device *device) | |
654 | { | |
e8e27047 | 655 | struct hv_device *hv_dev = device_to_hv_device(device); |
086e7a56 | 656 | |
e8e27047 | 657 | kfree(hv_dev); |
086e7a56 S |
658 | |
659 | } | |
660 | ||
454f18a9 | 661 | /* The one and only one */ |
9adcac5c S |
662 | static struct bus_type hv_bus = { |
663 | .name = "vmbus", | |
664 | .match = vmbus_match, | |
665 | .shutdown = vmbus_shutdown, | |
666 | .remove = vmbus_remove, | |
667 | .probe = vmbus_probe, | |
668 | .uevent = vmbus_uevent, | |
03f3a910 | 669 | .dev_groups = vmbus_groups, |
3e7ee490 HJ |
670 | }; |
671 | ||
bf6506f6 TT |
672 | struct onmessage_work_context { |
673 | struct work_struct work; | |
674 | struct hv_message msg; | |
675 | }; | |
676 | ||
677 | static void vmbus_onmessage_work(struct work_struct *work) | |
678 | { | |
679 | struct onmessage_work_context *ctx; | |
680 | ||
09a19628 VK |
681 | /* Do not process messages if we're in DISCONNECTED state */ |
682 | if (vmbus_connection.conn_state == DISCONNECTED) | |
683 | return; | |
684 | ||
bf6506f6 TT |
685 | ctx = container_of(work, struct onmessage_work_context, |
686 | work); | |
687 | vmbus_onmessage(&ctx->msg); | |
688 | kfree(ctx); | |
689 | } | |
690 | ||
d8a60e00 | 691 | static void hv_process_timer_expiration(struct hv_message *msg, int cpu) |
4061ed9e S |
692 | { |
693 | struct clock_event_device *dev = hv_context.clk_evt[cpu]; | |
694 | ||
695 | if (dev->event_handler) | |
696 | dev->event_handler(dev); | |
697 | ||
698 | msg->header.message_type = HVMSG_NONE; | |
699 | ||
700 | /* | |
701 | * Make sure the write to MessageType (ie set to | |
702 | * HVMSG_NONE) happens before we read the | |
703 | * MessagePending and EOMing. Otherwise, the EOMing | |
704 | * will not deliver any more messages since there is | |
705 | * no empty slot | |
706 | */ | |
707 | mb(); | |
708 | ||
709 | if (msg->header.message_flags.msg_pending) { | |
710 | /* | |
711 | * This will cause message queue rescan to | |
712 | * possibly deliver another msg from the | |
713 | * hypervisor | |
714 | */ | |
715 | wrmsrl(HV_X64_MSR_EOM, 0); | |
716 | } | |
717 | } | |
718 | ||
62c1059d | 719 | static void vmbus_on_msg_dpc(unsigned long data) |
36199a99 GKH |
720 | { |
721 | int cpu = smp_processor_id(); | |
722 | void *page_addr = hv_context.synic_message_page[cpu]; | |
723 | struct hv_message *msg = (struct hv_message *)page_addr + | |
724 | VMBUS_MESSAGE_SINT; | |
652594c7 DC |
725 | struct vmbus_channel_message_header *hdr; |
726 | struct vmbus_channel_message_table_entry *entry; | |
bf6506f6 | 727 | struct onmessage_work_context *ctx; |
36199a99 GKH |
728 | |
729 | while (1) { | |
652594c7 | 730 | if (msg->header.message_type == HVMSG_NONE) |
36199a99 GKH |
731 | /* no msg */ |
732 | break; | |
652594c7 DC |
733 | |
734 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; | |
735 | ||
736 | if (hdr->msgtype >= CHANNELMSG_COUNT) { | |
737 | WARN_ONCE(1, "unknown msgtype=%d\n", hdr->msgtype); | |
738 | goto msg_handled; | |
739 | } | |
740 | ||
741 | entry = &channel_message_table[hdr->msgtype]; | |
742 | if (entry->handler_type == VMHT_BLOCKING) { | |
bf6506f6 TT |
743 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); |
744 | if (ctx == NULL) | |
36199a99 | 745 | continue; |
652594c7 | 746 | |
bf6506f6 TT |
747 | INIT_WORK(&ctx->work, vmbus_onmessage_work); |
748 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
652594c7 | 749 | |
da9fcb72 | 750 | queue_work(vmbus_connection.work_queue, &ctx->work); |
652594c7 DC |
751 | } else |
752 | entry->message_handler(hdr); | |
36199a99 | 753 | |
652594c7 | 754 | msg_handled: |
36199a99 GKH |
755 | msg->header.message_type = HVMSG_NONE; |
756 | ||
757 | /* | |
758 | * Make sure the write to MessageType (ie set to | |
759 | * HVMSG_NONE) happens before we read the | |
760 | * MessagePending and EOMing. Otherwise, the EOMing | |
761 | * will not deliver any more messages since there is | |
762 | * no empty slot | |
763 | */ | |
35848f68 | 764 | mb(); |
36199a99 GKH |
765 | |
766 | if (msg->header.message_flags.msg_pending) { | |
767 | /* | |
768 | * This will cause message queue rescan to | |
769 | * possibly deliver another msg from the | |
770 | * hypervisor | |
771 | */ | |
772 | wrmsrl(HV_X64_MSR_EOM, 0); | |
773 | } | |
774 | } | |
775 | } | |
776 | ||
76d388cd | 777 | static void vmbus_isr(void) |
36199a99 | 778 | { |
36199a99 GKH |
779 | int cpu = smp_processor_id(); |
780 | void *page_addr; | |
781 | struct hv_message *msg; | |
782 | union hv_synic_event_flags *event; | |
ae4636e6 | 783 | bool handled = false; |
36199a99 | 784 | |
5ab05951 S |
785 | page_addr = hv_context.synic_event_page[cpu]; |
786 | if (page_addr == NULL) | |
76d388cd | 787 | return; |
5ab05951 S |
788 | |
789 | event = (union hv_synic_event_flags *)page_addr + | |
790 | VMBUS_MESSAGE_SINT; | |
7341d908 S |
791 | /* |
792 | * Check for events before checking for messages. This is the order | |
793 | * in which events and messages are checked in Windows guests on | |
794 | * Hyper-V, and the Windows team suggested we do the same. | |
795 | */ | |
36199a99 | 796 | |
6552ecd7 S |
797 | if ((vmbus_proto_version == VERSION_WS2008) || |
798 | (vmbus_proto_version == VERSION_WIN7)) { | |
36199a99 | 799 | |
6552ecd7 S |
800 | /* Since we are a child, we only need to check bit 0 */ |
801 | if (sync_test_and_clear_bit(0, | |
802 | (unsigned long *) &event->flags32[0])) { | |
803 | handled = true; | |
804 | } | |
805 | } else { | |
806 | /* | |
807 | * Our host is win8 or above. The signaling mechanism | |
808 | * has changed and we can directly look at the event page. | |
809 | * If bit n is set then we have an interrup on the channel | |
810 | * whose id is n. | |
811 | */ | |
ae4636e6 | 812 | handled = true; |
ae4636e6 | 813 | } |
793be9c7 | 814 | |
6552ecd7 | 815 | if (handled) |
db11f12a | 816 | tasklet_schedule(hv_context.event_dpc[cpu]); |
6552ecd7 S |
817 | |
818 | ||
7341d908 S |
819 | page_addr = hv_context.synic_message_page[cpu]; |
820 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; | |
821 | ||
822 | /* Check if there are actual msgs to be processed */ | |
4061ed9e S |
823 | if (msg->header.message_type != HVMSG_NONE) { |
824 | if (msg->header.message_type == HVMSG_TIMER_EXPIRED) | |
825 | hv_process_timer_expiration(msg, cpu); | |
826 | else | |
827 | tasklet_schedule(&msg_dpc); | |
828 | } | |
793be9c7 S |
829 | } |
830 | ||
e513229b | 831 | |
3e189519 | 832 | /* |
90c9960e GKH |
833 | * vmbus_bus_init -Main vmbus driver initialization routine. |
834 | * | |
835 | * Here, we | |
0686e4f4 | 836 | * - initialize the vmbus driver context |
0686e4f4 LL |
837 | * - invoke the vmbus hv main init routine |
838 | * - get the irq resource | |
0686e4f4 | 839 | * - retrieve the channel offers |
90c9960e | 840 | */ |
9aaa995e | 841 | static int vmbus_bus_init(int irq) |
3e7ee490 | 842 | { |
90c9960e | 843 | int ret; |
3e7ee490 | 844 | |
6d26e38f GKH |
845 | /* Hypervisor initialization...setup hypercall page..etc */ |
846 | ret = hv_init(); | |
90c9960e | 847 | if (ret != 0) { |
0a46618d | 848 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); |
d6c1c5de | 849 | return ret; |
3e7ee490 HJ |
850 | } |
851 | ||
59c0e4f0 | 852 | tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0); |
3e7ee490 | 853 | |
9adcac5c | 854 | ret = bus_register(&hv_bus); |
d6c1c5de | 855 | if (ret) |
8b9987e9 | 856 | goto err_cleanup; |
3e7ee490 | 857 | |
76d388cd | 858 | hv_setup_vmbus_irq(vmbus_isr); |
3e7ee490 | 859 | |
2608fb65 JW |
860 | ret = hv_synic_alloc(); |
861 | if (ret) | |
862 | goto err_alloc; | |
800b6902 | 863 | /* |
302a3c0f | 864 | * Initialize the per-cpu interrupt state and |
800b6902 S |
865 | * connect to the host. |
866 | */ | |
302a3c0f | 867 | on_each_cpu(hv_synic_init, NULL, 1); |
800b6902 | 868 | ret = vmbus_connect(); |
8b9987e9 | 869 | if (ret) |
2608fb65 | 870 | goto err_alloc; |
800b6902 | 871 | |
f39c4280 VK |
872 | if (vmbus_proto_version > VERSION_WIN7) |
873 | cpu_hotplug_disable(); | |
96c1d058 NM |
874 | |
875 | /* | |
876 | * Only register if the crash MSRs are available | |
877 | */ | |
cc2dd402 | 878 | if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) { |
510f7aef | 879 | register_die_notifier(&hyperv_die_block); |
96c1d058 NM |
880 | atomic_notifier_chain_register(&panic_notifier_list, |
881 | &hyperv_panic_block); | |
882 | } | |
883 | ||
2d6e882b | 884 | vmbus_request_offers(); |
8b5d6d3b | 885 | |
d6c1c5de | 886 | return 0; |
8b9987e9 | 887 | |
2608fb65 JW |
888 | err_alloc: |
889 | hv_synic_free(); | |
76d388cd | 890 | hv_remove_vmbus_irq(); |
8b9987e9 | 891 | |
8b9987e9 S |
892 | bus_unregister(&hv_bus); |
893 | ||
894 | err_cleanup: | |
895 | hv_cleanup(); | |
896 | ||
897 | return ret; | |
3e7ee490 HJ |
898 | } |
899 | ||
90c9960e | 900 | /** |
35464483 JO |
901 | * __vmbus_child_driver_register() - Register a vmbus's driver |
902 | * @hv_driver: Pointer to driver structure you want to register | |
768fa219 GKH |
903 | * @owner: owner module of the drv |
904 | * @mod_name: module name string | |
3e189519 HJ |
905 | * |
906 | * Registers the given driver with Linux through the 'driver_register()' call | |
768fa219 | 907 | * and sets up the hyper-v vmbus handling for this driver. |
3e189519 HJ |
908 | * It will return the state of the 'driver_register()' call. |
909 | * | |
90c9960e | 910 | */ |
768fa219 | 911 | int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) |
3e7ee490 | 912 | { |
5d48a1c2 | 913 | int ret; |
3e7ee490 | 914 | |
768fa219 | 915 | pr_info("registering driver %s\n", hv_driver->name); |
3e7ee490 | 916 | |
cf6a2eac S |
917 | ret = vmbus_exists(); |
918 | if (ret < 0) | |
919 | return ret; | |
920 | ||
768fa219 GKH |
921 | hv_driver->driver.name = hv_driver->name; |
922 | hv_driver->driver.owner = owner; | |
923 | hv_driver->driver.mod_name = mod_name; | |
924 | hv_driver->driver.bus = &hv_bus; | |
3e7ee490 | 925 | |
768fa219 | 926 | ret = driver_register(&hv_driver->driver); |
3e7ee490 | 927 | |
5d48a1c2 | 928 | return ret; |
3e7ee490 | 929 | } |
768fa219 | 930 | EXPORT_SYMBOL_GPL(__vmbus_driver_register); |
3e7ee490 | 931 | |
90c9960e | 932 | /** |
768fa219 | 933 | * vmbus_driver_unregister() - Unregister a vmbus's driver |
35464483 JO |
934 | * @hv_driver: Pointer to driver structure you want to |
935 | * un-register | |
3e189519 | 936 | * |
768fa219 GKH |
937 | * Un-register the given driver that was previous registered with a call to |
938 | * vmbus_driver_register() | |
90c9960e | 939 | */ |
768fa219 | 940 | void vmbus_driver_unregister(struct hv_driver *hv_driver) |
3e7ee490 | 941 | { |
768fa219 | 942 | pr_info("unregistering driver %s\n", hv_driver->name); |
3e7ee490 | 943 | |
cf6a2eac | 944 | if (!vmbus_exists()) |
8f257a14 | 945 | driver_unregister(&hv_driver->driver); |
3e7ee490 | 946 | } |
768fa219 | 947 | EXPORT_SYMBOL_GPL(vmbus_driver_unregister); |
3e7ee490 | 948 | |
3e189519 | 949 | /* |
f2c73011 | 950 | * vmbus_device_create - Creates and registers a new child device |
3e189519 | 951 | * on the vmbus. |
90c9960e | 952 | */ |
1b9d48f2 | 953 | struct hv_device *vmbus_device_create(const uuid_le *type, |
954 | const uuid_le *instance, | |
955 | struct vmbus_channel *channel) | |
3e7ee490 | 956 | { |
3d3b5518 | 957 | struct hv_device *child_device_obj; |
3e7ee490 | 958 | |
6bad88da S |
959 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); |
960 | if (!child_device_obj) { | |
0a46618d | 961 | pr_err("Unable to allocate device object for child device\n"); |
3e7ee490 HJ |
962 | return NULL; |
963 | } | |
964 | ||
cae5b843 | 965 | child_device_obj->channel = channel; |
358d2ee2 | 966 | memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); |
ca623ad3 | 967 | memcpy(&child_device_obj->dev_instance, instance, |
358d2ee2 | 968 | sizeof(uuid_le)); |
3e7ee490 | 969 | |
3e7ee490 | 970 | |
3e7ee490 HJ |
971 | return child_device_obj; |
972 | } | |
973 | ||
3e189519 | 974 | /* |
22794281 | 975 | * vmbus_device_register - Register the child device |
90c9960e | 976 | */ |
22794281 | 977 | int vmbus_device_register(struct hv_device *child_device_obj) |
3e7ee490 | 978 | { |
90c9960e | 979 | int ret = 0; |
6bad88da | 980 | |
bc63b6f6 VK |
981 | dev_set_name(&child_device_obj->device, "vmbus_%d", |
982 | child_device_obj->channel->id); | |
3e7ee490 | 983 | |
0bce28b6 | 984 | child_device_obj->device.bus = &hv_bus; |
607c1a11 | 985 | child_device_obj->device.parent = &hv_acpi_dev->dev; |
6bad88da | 986 | child_device_obj->device.release = vmbus_device_release; |
3e7ee490 | 987 | |
90c9960e GKH |
988 | /* |
989 | * Register with the LDM. This will kick off the driver/device | |
990 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
991 | */ | |
6bad88da | 992 | ret = device_register(&child_device_obj->device); |
3e7ee490 | 993 | |
3e7ee490 | 994 | if (ret) |
0a46618d | 995 | pr_err("Unable to register child device\n"); |
3e7ee490 | 996 | else |
84672369 | 997 | pr_debug("child device %s registered\n", |
0a46618d | 998 | dev_name(&child_device_obj->device)); |
3e7ee490 | 999 | |
3e7ee490 HJ |
1000 | return ret; |
1001 | } | |
1002 | ||
3e189519 | 1003 | /* |
696453ba | 1004 | * vmbus_device_unregister - Remove the specified child device |
3e189519 | 1005 | * from the vmbus. |
90c9960e | 1006 | */ |
696453ba | 1007 | void vmbus_device_unregister(struct hv_device *device_obj) |
3e7ee490 | 1008 | { |
84672369 FS |
1009 | pr_debug("child device %s unregistered\n", |
1010 | dev_name(&device_obj->device)); | |
1011 | ||
90c9960e GKH |
1012 | /* |
1013 | * Kick off the process of unregistering the device. | |
1014 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
1015 | */ | |
6bad88da | 1016 | device_unregister(&device_obj->device); |
3e7ee490 HJ |
1017 | } |
1018 | ||
3e7ee490 | 1019 | |
b0069f43 | 1020 | /* |
7f163a6f | 1021 | * VMBUS is an acpi enumerated device. Get the information we |
90f34535 | 1022 | * need from DSDT. |
b0069f43 | 1023 | */ |
7f163a6f | 1024 | #define VTPM_BASE_ADDRESS 0xfed40000 |
90f34535 | 1025 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx) |
b0069f43 | 1026 | { |
7f163a6f JO |
1027 | resource_size_t start = 0; |
1028 | resource_size_t end = 0; | |
1029 | struct resource *new_res; | |
1030 | struct resource **old_res = &hyperv_mmio; | |
1031 | struct resource **prev_res = NULL; | |
1032 | ||
90f34535 S |
1033 | switch (res->type) { |
1034 | case ACPI_RESOURCE_TYPE_IRQ: | |
1035 | irq = res->data.irq.interrupts[0]; | |
7f163a6f JO |
1036 | return AE_OK; |
1037 | ||
1038 | /* | |
1039 | * "Address" descriptors are for bus windows. Ignore | |
1040 | * "memory" descriptors, which are for registers on | |
1041 | * devices. | |
1042 | */ | |
1043 | case ACPI_RESOURCE_TYPE_ADDRESS32: | |
1044 | start = res->data.address32.address.minimum; | |
1045 | end = res->data.address32.address.maximum; | |
4eb923f8 | 1046 | break; |
b0069f43 | 1047 | |
90f34535 | 1048 | case ACPI_RESOURCE_TYPE_ADDRESS64: |
7f163a6f JO |
1049 | start = res->data.address64.address.minimum; |
1050 | end = res->data.address64.address.maximum; | |
4eb923f8 | 1051 | break; |
7f163a6f JO |
1052 | |
1053 | default: | |
1054 | /* Unused resource type */ | |
1055 | return AE_OK; | |
1056 | ||
b0069f43 | 1057 | } |
7f163a6f JO |
1058 | /* |
1059 | * Ignore ranges that are below 1MB, as they're not | |
1060 | * necessary or useful here. | |
1061 | */ | |
1062 | if (end < 0x100000) | |
1063 | return AE_OK; | |
1064 | ||
1065 | new_res = kzalloc(sizeof(*new_res), GFP_ATOMIC); | |
1066 | if (!new_res) | |
1067 | return AE_NO_MEMORY; | |
1068 | ||
1069 | /* If this range overlaps the virtual TPM, truncate it. */ | |
1070 | if (end > VTPM_BASE_ADDRESS && start < VTPM_BASE_ADDRESS) | |
1071 | end = VTPM_BASE_ADDRESS; | |
1072 | ||
1073 | new_res->name = "hyperv mmio"; | |
1074 | new_res->flags = IORESOURCE_MEM; | |
1075 | new_res->start = start; | |
1076 | new_res->end = end; | |
1077 | ||
1078 | do { | |
1079 | if (!*old_res) { | |
1080 | *old_res = new_res; | |
1081 | break; | |
1082 | } | |
1083 | ||
1084 | if ((*old_res)->end < new_res->start) { | |
1085 | new_res->sibling = *old_res; | |
1086 | if (prev_res) | |
1087 | (*prev_res)->sibling = new_res; | |
1088 | *old_res = new_res; | |
1089 | break; | |
1090 | } | |
1091 | ||
1092 | prev_res = old_res; | |
1093 | old_res = &(*old_res)->sibling; | |
1094 | ||
1095 | } while (1); | |
b0069f43 S |
1096 | |
1097 | return AE_OK; | |
1098 | } | |
1099 | ||
7f163a6f JO |
1100 | static int vmbus_acpi_remove(struct acpi_device *device) |
1101 | { | |
1102 | struct resource *cur_res; | |
1103 | struct resource *next_res; | |
1104 | ||
1105 | if (hyperv_mmio) { | |
1106 | for (cur_res = hyperv_mmio; cur_res; cur_res = next_res) { | |
1107 | next_res = cur_res->sibling; | |
1108 | kfree(cur_res); | |
1109 | } | |
1110 | } | |
1111 | ||
1112 | return 0; | |
1113 | } | |
1114 | ||
35464483 JO |
1115 | /** |
1116 | * vmbus_allocate_mmio() - Pick a memory-mapped I/O range. | |
1117 | * @new: If successful, supplied a pointer to the | |
1118 | * allocated MMIO space. | |
1119 | * @device_obj: Identifies the caller | |
1120 | * @min: Minimum guest physical address of the | |
1121 | * allocation | |
1122 | * @max: Maximum guest physical address | |
1123 | * @size: Size of the range to be allocated | |
1124 | * @align: Alignment of the range to be allocated | |
1125 | * @fb_overlap_ok: Whether this allocation can be allowed | |
1126 | * to overlap the video frame buffer. | |
1127 | * | |
1128 | * This function walks the resources granted to VMBus by the | |
1129 | * _CRS object in the ACPI namespace underneath the parent | |
1130 | * "bridge" whether that's a root PCI bus in the Generation 1 | |
1131 | * case or a Module Device in the Generation 2 case. It then | |
1132 | * attempts to allocate from the global MMIO pool in a way that | |
1133 | * matches the constraints supplied in these parameters and by | |
1134 | * that _CRS. | |
1135 | * | |
1136 | * Return: 0 on success, -errno on failure | |
1137 | */ | |
1138 | int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj, | |
1139 | resource_size_t min, resource_size_t max, | |
1140 | resource_size_t size, resource_size_t align, | |
1141 | bool fb_overlap_ok) | |
1142 | { | |
1143 | struct resource *iter; | |
1144 | resource_size_t range_min, range_max, start, local_min, local_max; | |
1145 | const char *dev_n = dev_name(&device_obj->device); | |
1146 | u32 fb_end = screen_info.lfb_base + (screen_info.lfb_size << 1); | |
1147 | int i; | |
1148 | ||
1149 | for (iter = hyperv_mmio; iter; iter = iter->sibling) { | |
1150 | if ((iter->start >= max) || (iter->end <= min)) | |
1151 | continue; | |
1152 | ||
1153 | range_min = iter->start; | |
1154 | range_max = iter->end; | |
1155 | ||
1156 | /* If this range overlaps the frame buffer, split it into | |
1157 | two tries. */ | |
1158 | for (i = 0; i < 2; i++) { | |
1159 | local_min = range_min; | |
1160 | local_max = range_max; | |
1161 | if (fb_overlap_ok || (range_min >= fb_end) || | |
1162 | (range_max <= screen_info.lfb_base)) { | |
1163 | i++; | |
1164 | } else { | |
1165 | if ((range_min <= screen_info.lfb_base) && | |
1166 | (range_max >= screen_info.lfb_base)) { | |
1167 | /* | |
1168 | * The frame buffer is in this window, | |
1169 | * so trim this into the part that | |
1170 | * preceeds the frame buffer. | |
1171 | */ | |
1172 | local_max = screen_info.lfb_base - 1; | |
1173 | range_min = fb_end; | |
1174 | } else { | |
1175 | range_min = fb_end; | |
1176 | continue; | |
1177 | } | |
1178 | } | |
1179 | ||
1180 | start = (local_min + align - 1) & ~(align - 1); | |
1181 | for (; start + size - 1 <= local_max; start += align) { | |
1182 | *new = request_mem_region_exclusive(start, size, | |
1183 | dev_n); | |
1184 | if (*new) | |
1185 | return 0; | |
1186 | } | |
1187 | } | |
1188 | } | |
1189 | ||
1190 | return -ENXIO; | |
1191 | } | |
1192 | EXPORT_SYMBOL_GPL(vmbus_allocate_mmio); | |
1193 | ||
b0069f43 S |
1194 | static int vmbus_acpi_add(struct acpi_device *device) |
1195 | { | |
1196 | acpi_status result; | |
90f34535 | 1197 | int ret_val = -ENODEV; |
7f163a6f | 1198 | struct acpi_device *ancestor; |
b0069f43 | 1199 | |
607c1a11 S |
1200 | hv_acpi_dev = device; |
1201 | ||
0a4425b6 | 1202 | result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
90f34535 | 1203 | vmbus_walk_resources, NULL); |
b0069f43 | 1204 | |
90f34535 S |
1205 | if (ACPI_FAILURE(result)) |
1206 | goto acpi_walk_err; | |
1207 | /* | |
7f163a6f JO |
1208 | * Some ancestor of the vmbus acpi device (Gen1 or Gen2 |
1209 | * firmware) is the VMOD that has the mmio ranges. Get that. | |
90f34535 | 1210 | */ |
7f163a6f JO |
1211 | for (ancestor = device->parent; ancestor; ancestor = ancestor->parent) { |
1212 | result = acpi_walk_resources(ancestor->handle, METHOD_NAME__CRS, | |
1213 | vmbus_walk_resources, NULL); | |
90f34535 S |
1214 | |
1215 | if (ACPI_FAILURE(result)) | |
7f163a6f JO |
1216 | continue; |
1217 | if (hyperv_mmio) | |
1218 | break; | |
b0069f43 | 1219 | } |
90f34535 S |
1220 | ret_val = 0; |
1221 | ||
1222 | acpi_walk_err: | |
b0069f43 | 1223 | complete(&probe_event); |
7f163a6f JO |
1224 | if (ret_val) |
1225 | vmbus_acpi_remove(device); | |
90f34535 | 1226 | return ret_val; |
b0069f43 S |
1227 | } |
1228 | ||
1229 | static const struct acpi_device_id vmbus_acpi_device_ids[] = { | |
1230 | {"VMBUS", 0}, | |
9d7b18d1 | 1231 | {"VMBus", 0}, |
b0069f43 S |
1232 | {"", 0}, |
1233 | }; | |
1234 | MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); | |
1235 | ||
1236 | static struct acpi_driver vmbus_acpi_driver = { | |
1237 | .name = "vmbus", | |
1238 | .ids = vmbus_acpi_device_ids, | |
1239 | .ops = { | |
1240 | .add = vmbus_acpi_add, | |
e4ecb41c | 1241 | .remove = vmbus_acpi_remove, |
b0069f43 S |
1242 | }, |
1243 | }; | |
1244 | ||
2517281d VK |
1245 | static void hv_kexec_handler(void) |
1246 | { | |
1247 | int cpu; | |
1248 | ||
1249 | hv_synic_clockevents_cleanup(); | |
1250 | vmbus_initiate_unload(); | |
1251 | for_each_online_cpu(cpu) | |
1252 | smp_call_function_single(cpu, hv_synic_cleanup, NULL, 1); | |
1253 | hv_cleanup(); | |
1254 | }; | |
1255 | ||
b4370df2 VK |
1256 | static void hv_crash_handler(struct pt_regs *regs) |
1257 | { | |
1258 | vmbus_initiate_unload(); | |
1259 | /* | |
1260 | * In crash handler we can't schedule synic cleanup for all CPUs, | |
1261 | * doing the cleanup for current CPU only. This should be sufficient | |
1262 | * for kdump. | |
1263 | */ | |
1264 | hv_synic_cleanup(NULL); | |
1265 | hv_cleanup(); | |
1266 | }; | |
1267 | ||
607c1a11 | 1268 | static int __init hv_acpi_init(void) |
1168ac22 | 1269 | { |
2dda95f8 | 1270 | int ret, t; |
b0069f43 | 1271 | |
1f94ea81 | 1272 | if (x86_hyper != &x86_hyper_ms_hyperv) |
0592969e JW |
1273 | return -ENODEV; |
1274 | ||
b0069f43 S |
1275 | init_completion(&probe_event); |
1276 | ||
1277 | /* | |
1278 | * Get irq resources first. | |
1279 | */ | |
0246604c S |
1280 | ret = acpi_bus_register_driver(&vmbus_acpi_driver); |
1281 | ||
b0069f43 S |
1282 | if (ret) |
1283 | return ret; | |
1284 | ||
2dda95f8 S |
1285 | t = wait_for_completion_timeout(&probe_event, 5*HZ); |
1286 | if (t == 0) { | |
1287 | ret = -ETIMEDOUT; | |
1288 | goto cleanup; | |
1289 | } | |
b0069f43 S |
1290 | |
1291 | if (irq <= 0) { | |
2dda95f8 S |
1292 | ret = -ENODEV; |
1293 | goto cleanup; | |
b0069f43 S |
1294 | } |
1295 | ||
91fd799e S |
1296 | ret = vmbus_bus_init(irq); |
1297 | if (ret) | |
2dda95f8 S |
1298 | goto cleanup; |
1299 | ||
2517281d | 1300 | hv_setup_kexec_handler(hv_kexec_handler); |
b4370df2 | 1301 | hv_setup_crash_handler(hv_crash_handler); |
2517281d | 1302 | |
2dda95f8 S |
1303 | return 0; |
1304 | ||
1305 | cleanup: | |
1306 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
cf6a2eac | 1307 | hv_acpi_dev = NULL; |
91fd799e | 1308 | return ret; |
1168ac22 S |
1309 | } |
1310 | ||
93e5bd06 S |
1311 | static void __exit vmbus_exit(void) |
1312 | { | |
e72e7ac5 VK |
1313 | int cpu; |
1314 | ||
2517281d | 1315 | hv_remove_kexec_handler(); |
b4370df2 | 1316 | hv_remove_crash_handler(); |
09a19628 | 1317 | vmbus_connection.conn_state = DISCONNECTED; |
e086748c | 1318 | hv_synic_clockevents_cleanup(); |
2db84eff | 1319 | vmbus_disconnect(); |
76d388cd | 1320 | hv_remove_vmbus_irq(); |
1959a28e | 1321 | tasklet_kill(&msg_dpc); |
93e5bd06 | 1322 | vmbus_free_channels(); |
cc2dd402 | 1323 | if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) { |
510f7aef | 1324 | unregister_die_notifier(&hyperv_die_block); |
096c605f VK |
1325 | atomic_notifier_chain_unregister(&panic_notifier_list, |
1326 | &hyperv_panic_block); | |
1327 | } | |
93e5bd06 S |
1328 | bus_unregister(&hv_bus); |
1329 | hv_cleanup(); | |
1959a28e VK |
1330 | for_each_online_cpu(cpu) { |
1331 | tasklet_kill(hv_context.event_dpc[cpu]); | |
e72e7ac5 | 1332 | smp_call_function_single(cpu, hv_synic_cleanup, NULL, 1); |
1959a28e | 1333 | } |
06210b42 | 1334 | hv_synic_free(); |
93e5bd06 | 1335 | acpi_bus_unregister_driver(&vmbus_acpi_driver); |
f39c4280 VK |
1336 | if (vmbus_proto_version > VERSION_WIN7) |
1337 | cpu_hotplug_enable(); | |
93e5bd06 S |
1338 | } |
1339 | ||
1168ac22 | 1340 | |
90c9960e | 1341 | MODULE_LICENSE("GPL"); |
3e7ee490 | 1342 | |
43d4e119 | 1343 | subsys_initcall(hv_acpi_init); |
93e5bd06 | 1344 | module_exit(vmbus_exit); |