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Commit | Line | Data |
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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> |
68db0cf1 IM |
37 | #include <linux/sched/task_stack.h> |
38 | ||
407dd164 | 39 | #include <asm/hyperv.h> |
1f94ea81 | 40 | #include <asm/hypervisor.h> |
302a3c0f | 41 | #include <asm/mshyperv.h> |
96c1d058 NM |
42 | #include <linux/notifier.h> |
43 | #include <linux/ptrace.h> | |
35464483 | 44 | #include <linux/screen_info.h> |
510f7aef | 45 | #include <linux/kdebug.h> |
6d146aef | 46 | #include <linux/efi.h> |
4b44f2d1 | 47 | #include <linux/random.h> |
0f2a6619 | 48 | #include "hyperv_vmbus.h" |
3e7ee490 | 49 | |
fc76936d SH |
50 | struct vmbus_dynid { |
51 | struct list_head node; | |
52 | struct hv_vmbus_device_id id; | |
53 | }; | |
54 | ||
607c1a11 | 55 | static struct acpi_device *hv_acpi_dev; |
1168ac22 | 56 | |
71a6655d | 57 | static struct completion probe_event; |
98db4335 | 58 | |
76d36ab7 | 59 | static int hyperv_cpuhp_online; |
96c1d058 | 60 | |
510f7aef VK |
61 | static int hyperv_panic_event(struct notifier_block *nb, unsigned long val, |
62 | void *args) | |
63 | { | |
64 | struct pt_regs *regs; | |
65 | ||
66 | regs = current_pt_regs(); | |
67 | ||
7ed4325a | 68 | hyperv_report_panic(regs, val); |
96c1d058 NM |
69 | return NOTIFY_DONE; |
70 | } | |
71 | ||
510f7aef VK |
72 | static int hyperv_die_event(struct notifier_block *nb, unsigned long val, |
73 | void *args) | |
74 | { | |
75 | struct die_args *die = (struct die_args *)args; | |
76 | struct pt_regs *regs = die->regs; | |
77 | ||
7ed4325a | 78 | hyperv_report_panic(regs, val); |
510f7aef VK |
79 | return NOTIFY_DONE; |
80 | } | |
81 | ||
82 | static struct notifier_block hyperv_die_block = { | |
83 | .notifier_call = hyperv_die_event, | |
84 | }; | |
96c1d058 NM |
85 | static struct notifier_block hyperv_panic_block = { |
86 | .notifier_call = hyperv_panic_event, | |
87 | }; | |
88 | ||
6d146aef JO |
89 | static const char *fb_mmio_name = "fb_range"; |
90 | static struct resource *fb_mmio; | |
e2e80841 SH |
91 | static struct resource *hyperv_mmio; |
92 | static DEFINE_SEMAPHORE(hyperv_mmio_lock); | |
98db4335 | 93 | |
cf6a2eac S |
94 | static int vmbus_exists(void) |
95 | { | |
96 | if (hv_acpi_dev == NULL) | |
97 | return -ENODEV; | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
fd776ba9 OH |
102 | #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2) |
103 | static void print_alias_name(struct hv_device *hv_dev, char *alias_name) | |
104 | { | |
105 | int i; | |
106 | for (i = 0; i < VMBUS_ALIAS_LEN; i += 2) | |
107 | sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]); | |
108 | } | |
109 | ||
c2e5df61 | 110 | static u8 channel_monitor_group(const struct vmbus_channel *channel) |
76c52bbe GKH |
111 | { |
112 | return (u8)channel->offermsg.monitorid / 32; | |
113 | } | |
114 | ||
c2e5df61 | 115 | static u8 channel_monitor_offset(const struct vmbus_channel *channel) |
76c52bbe GKH |
116 | { |
117 | return (u8)channel->offermsg.monitorid % 32; | |
118 | } | |
119 | ||
c2e5df61 SH |
120 | static u32 channel_pending(const struct vmbus_channel *channel, |
121 | const struct hv_monitor_page *monitor_page) | |
76c52bbe GKH |
122 | { |
123 | u8 monitor_group = channel_monitor_group(channel); | |
c2e5df61 | 124 | |
76c52bbe GKH |
125 | return monitor_page->trigger_group[monitor_group].pending; |
126 | } | |
127 | ||
c2e5df61 SH |
128 | static u32 channel_latency(const struct vmbus_channel *channel, |
129 | const struct hv_monitor_page *monitor_page) | |
1cee272b GKH |
130 | { |
131 | u8 monitor_group = channel_monitor_group(channel); | |
132 | u8 monitor_offset = channel_monitor_offset(channel); | |
c2e5df61 | 133 | |
1cee272b GKH |
134 | return monitor_page->latency[monitor_group][monitor_offset]; |
135 | } | |
136 | ||
4947c745 GKH |
137 | static u32 channel_conn_id(struct vmbus_channel *channel, |
138 | struct hv_monitor_page *monitor_page) | |
139 | { | |
140 | u8 monitor_group = channel_monitor_group(channel); | |
141 | u8 monitor_offset = channel_monitor_offset(channel); | |
142 | return monitor_page->parameter[monitor_group][monitor_offset].connectionid.u.id; | |
143 | } | |
144 | ||
03f3a910 GKH |
145 | static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr, |
146 | char *buf) | |
147 | { | |
148 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
149 | ||
150 | if (!hv_dev->channel) | |
151 | return -ENODEV; | |
152 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid); | |
153 | } | |
154 | static DEVICE_ATTR_RO(id); | |
155 | ||
a8fb5f3d GKH |
156 | static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr, |
157 | char *buf) | |
158 | { | |
159 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
160 | ||
161 | if (!hv_dev->channel) | |
162 | return -ENODEV; | |
163 | return sprintf(buf, "%d\n", hv_dev->channel->state); | |
164 | } | |
165 | static DEVICE_ATTR_RO(state); | |
166 | ||
5ffd00e2 GKH |
167 | static ssize_t monitor_id_show(struct device *dev, |
168 | struct device_attribute *dev_attr, char *buf) | |
169 | { | |
170 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
171 | ||
172 | if (!hv_dev->channel) | |
173 | return -ENODEV; | |
174 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.monitorid); | |
175 | } | |
176 | static DEVICE_ATTR_RO(monitor_id); | |
177 | ||
68234c04 GKH |
178 | static ssize_t class_id_show(struct device *dev, |
179 | struct device_attribute *dev_attr, char *buf) | |
180 | { | |
181 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
182 | ||
183 | if (!hv_dev->channel) | |
184 | return -ENODEV; | |
185 | return sprintf(buf, "{%pUl}\n", | |
186 | hv_dev->channel->offermsg.offer.if_type.b); | |
187 | } | |
188 | static DEVICE_ATTR_RO(class_id); | |
189 | ||
7c55e1d0 GKH |
190 | static ssize_t device_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_instance.b); | |
199 | } | |
200 | static DEVICE_ATTR_RO(device_id); | |
201 | ||
647fa371 GKH |
202 | static ssize_t modalias_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 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
207 | ||
208 | print_alias_name(hv_dev, alias_name); | |
209 | return sprintf(buf, "vmbus:%s\n", alias_name); | |
210 | } | |
211 | static DEVICE_ATTR_RO(modalias); | |
212 | ||
76c52bbe GKH |
213 | static ssize_t server_monitor_pending_show(struct device *dev, |
214 | struct device_attribute *dev_attr, | |
215 | char *buf) | |
216 | { | |
217 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
218 | ||
219 | if (!hv_dev->channel) | |
220 | return -ENODEV; | |
221 | return sprintf(buf, "%d\n", | |
222 | channel_pending(hv_dev->channel, | |
223 | vmbus_connection.monitor_pages[1])); | |
224 | } | |
225 | static DEVICE_ATTR_RO(server_monitor_pending); | |
226 | ||
227 | static ssize_t client_monitor_pending_show(struct device *dev, | |
228 | struct device_attribute *dev_attr, | |
229 | char *buf) | |
230 | { | |
231 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
232 | ||
233 | if (!hv_dev->channel) | |
234 | return -ENODEV; | |
235 | return sprintf(buf, "%d\n", | |
236 | channel_pending(hv_dev->channel, | |
237 | vmbus_connection.monitor_pages[1])); | |
238 | } | |
239 | static DEVICE_ATTR_RO(client_monitor_pending); | |
68234c04 | 240 | |
1cee272b GKH |
241 | static ssize_t server_monitor_latency_show(struct device *dev, |
242 | struct device_attribute *dev_attr, | |
243 | char *buf) | |
244 | { | |
245 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
246 | ||
247 | if (!hv_dev->channel) | |
248 | return -ENODEV; | |
249 | return sprintf(buf, "%d\n", | |
250 | channel_latency(hv_dev->channel, | |
251 | vmbus_connection.monitor_pages[0])); | |
252 | } | |
253 | static DEVICE_ATTR_RO(server_monitor_latency); | |
254 | ||
255 | static ssize_t client_monitor_latency_show(struct device *dev, | |
256 | struct device_attribute *dev_attr, | |
257 | char *buf) | |
258 | { | |
259 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
260 | ||
261 | if (!hv_dev->channel) | |
262 | return -ENODEV; | |
263 | return sprintf(buf, "%d\n", | |
264 | channel_latency(hv_dev->channel, | |
265 | vmbus_connection.monitor_pages[1])); | |
266 | } | |
267 | static DEVICE_ATTR_RO(client_monitor_latency); | |
268 | ||
4947c745 GKH |
269 | static ssize_t server_monitor_conn_id_show(struct device *dev, |
270 | struct device_attribute *dev_attr, | |
271 | char *buf) | |
272 | { | |
273 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
274 | ||
275 | if (!hv_dev->channel) | |
276 | return -ENODEV; | |
277 | return sprintf(buf, "%d\n", | |
278 | channel_conn_id(hv_dev->channel, | |
279 | vmbus_connection.monitor_pages[0])); | |
280 | } | |
281 | static DEVICE_ATTR_RO(server_monitor_conn_id); | |
282 | ||
283 | static ssize_t client_monitor_conn_id_show(struct device *dev, | |
284 | struct device_attribute *dev_attr, | |
285 | char *buf) | |
286 | { | |
287 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
288 | ||
289 | if (!hv_dev->channel) | |
290 | return -ENODEV; | |
291 | return sprintf(buf, "%d\n", | |
292 | channel_conn_id(hv_dev->channel, | |
293 | vmbus_connection.monitor_pages[1])); | |
294 | } | |
295 | static DEVICE_ATTR_RO(client_monitor_conn_id); | |
296 | ||
98f4c651 GKH |
297 | static ssize_t out_intr_mask_show(struct device *dev, |
298 | struct device_attribute *dev_attr, char *buf) | |
299 | { | |
300 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
301 | struct hv_ring_buffer_debug_info outbound; | |
302 | ||
303 | if (!hv_dev->channel) | |
304 | return -ENODEV; | |
305 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
306 | return sprintf(buf, "%d\n", outbound.current_interrupt_mask); | |
307 | } | |
308 | static DEVICE_ATTR_RO(out_intr_mask); | |
309 | ||
310 | static ssize_t out_read_index_show(struct device *dev, | |
311 | struct device_attribute *dev_attr, char *buf) | |
312 | { | |
313 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
314 | struct hv_ring_buffer_debug_info outbound; | |
315 | ||
316 | if (!hv_dev->channel) | |
317 | return -ENODEV; | |
318 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
319 | return sprintf(buf, "%d\n", outbound.current_read_index); | |
320 | } | |
321 | static DEVICE_ATTR_RO(out_read_index); | |
322 | ||
323 | static ssize_t out_write_index_show(struct device *dev, | |
324 | struct device_attribute *dev_attr, | |
325 | char *buf) | |
326 | { | |
327 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
328 | struct hv_ring_buffer_debug_info outbound; | |
329 | ||
330 | if (!hv_dev->channel) | |
331 | return -ENODEV; | |
332 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
333 | return sprintf(buf, "%d\n", outbound.current_write_index); | |
334 | } | |
335 | static DEVICE_ATTR_RO(out_write_index); | |
336 | ||
337 | static ssize_t out_read_bytes_avail_show(struct device *dev, | |
338 | struct device_attribute *dev_attr, | |
339 | char *buf) | |
340 | { | |
341 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
342 | struct hv_ring_buffer_debug_info outbound; | |
343 | ||
344 | if (!hv_dev->channel) | |
345 | return -ENODEV; | |
346 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
347 | return sprintf(buf, "%d\n", outbound.bytes_avail_toread); | |
348 | } | |
349 | static DEVICE_ATTR_RO(out_read_bytes_avail); | |
350 | ||
351 | static ssize_t out_write_bytes_avail_show(struct device *dev, | |
352 | struct device_attribute *dev_attr, | |
353 | char *buf) | |
354 | { | |
355 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
356 | struct hv_ring_buffer_debug_info outbound; | |
357 | ||
358 | if (!hv_dev->channel) | |
359 | return -ENODEV; | |
360 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
361 | return sprintf(buf, "%d\n", outbound.bytes_avail_towrite); | |
362 | } | |
363 | static DEVICE_ATTR_RO(out_write_bytes_avail); | |
364 | ||
365 | static ssize_t in_intr_mask_show(struct device *dev, | |
366 | struct device_attribute *dev_attr, char *buf) | |
367 | { | |
368 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
369 | struct hv_ring_buffer_debug_info inbound; | |
370 | ||
371 | if (!hv_dev->channel) | |
372 | return -ENODEV; | |
373 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
374 | return sprintf(buf, "%d\n", inbound.current_interrupt_mask); | |
375 | } | |
376 | static DEVICE_ATTR_RO(in_intr_mask); | |
377 | ||
378 | static ssize_t in_read_index_show(struct device *dev, | |
379 | struct device_attribute *dev_attr, char *buf) | |
380 | { | |
381 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
382 | struct hv_ring_buffer_debug_info inbound; | |
383 | ||
384 | if (!hv_dev->channel) | |
385 | return -ENODEV; | |
386 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
387 | return sprintf(buf, "%d\n", inbound.current_read_index); | |
388 | } | |
389 | static DEVICE_ATTR_RO(in_read_index); | |
390 | ||
391 | static ssize_t in_write_index_show(struct device *dev, | |
392 | struct device_attribute *dev_attr, char *buf) | |
393 | { | |
394 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
395 | struct hv_ring_buffer_debug_info inbound; | |
396 | ||
397 | if (!hv_dev->channel) | |
398 | return -ENODEV; | |
399 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
400 | return sprintf(buf, "%d\n", inbound.current_write_index); | |
401 | } | |
402 | static DEVICE_ATTR_RO(in_write_index); | |
403 | ||
404 | static ssize_t in_read_bytes_avail_show(struct device *dev, | |
405 | struct device_attribute *dev_attr, | |
406 | char *buf) | |
407 | { | |
408 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
409 | struct hv_ring_buffer_debug_info inbound; | |
410 | ||
411 | if (!hv_dev->channel) | |
412 | return -ENODEV; | |
413 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
414 | return sprintf(buf, "%d\n", inbound.bytes_avail_toread); | |
415 | } | |
416 | static DEVICE_ATTR_RO(in_read_bytes_avail); | |
417 | ||
418 | static ssize_t in_write_bytes_avail_show(struct device *dev, | |
419 | struct device_attribute *dev_attr, | |
420 | char *buf) | |
421 | { | |
422 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
423 | struct hv_ring_buffer_debug_info inbound; | |
424 | ||
425 | if (!hv_dev->channel) | |
426 | return -ENODEV; | |
427 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
428 | return sprintf(buf, "%d\n", inbound.bytes_avail_towrite); | |
429 | } | |
430 | static DEVICE_ATTR_RO(in_write_bytes_avail); | |
431 | ||
042ab031 DC |
432 | static ssize_t channel_vp_mapping_show(struct device *dev, |
433 | struct device_attribute *dev_attr, | |
434 | char *buf) | |
435 | { | |
436 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
437 | struct vmbus_channel *channel = hv_dev->channel, *cur_sc; | |
438 | unsigned long flags; | |
439 | int buf_size = PAGE_SIZE, n_written, tot_written; | |
440 | struct list_head *cur; | |
441 | ||
442 | if (!channel) | |
443 | return -ENODEV; | |
444 | ||
445 | tot_written = snprintf(buf, buf_size, "%u:%u\n", | |
446 | channel->offermsg.child_relid, channel->target_cpu); | |
447 | ||
448 | spin_lock_irqsave(&channel->lock, flags); | |
449 | ||
450 | list_for_each(cur, &channel->sc_list) { | |
451 | if (tot_written >= buf_size - 1) | |
452 | break; | |
453 | ||
454 | cur_sc = list_entry(cur, struct vmbus_channel, sc_list); | |
455 | n_written = scnprintf(buf + tot_written, | |
456 | buf_size - tot_written, | |
457 | "%u:%u\n", | |
458 | cur_sc->offermsg.child_relid, | |
459 | cur_sc->target_cpu); | |
460 | tot_written += n_written; | |
461 | } | |
462 | ||
463 | spin_unlock_irqrestore(&channel->lock, flags); | |
464 | ||
465 | return tot_written; | |
466 | } | |
467 | static DEVICE_ATTR_RO(channel_vp_mapping); | |
468 | ||
7047f17d S |
469 | static ssize_t vendor_show(struct device *dev, |
470 | struct device_attribute *dev_attr, | |
471 | char *buf) | |
472 | { | |
473 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
474 | return sprintf(buf, "0x%x\n", hv_dev->vendor_id); | |
475 | } | |
476 | static DEVICE_ATTR_RO(vendor); | |
477 | ||
478 | static ssize_t device_show(struct device *dev, | |
479 | struct device_attribute *dev_attr, | |
480 | char *buf) | |
481 | { | |
482 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
483 | return sprintf(buf, "0x%x\n", hv_dev->device_id); | |
484 | } | |
485 | static DEVICE_ATTR_RO(device); | |
486 | ||
98f4c651 | 487 | /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ |
fc76936d | 488 | static struct attribute *vmbus_dev_attrs[] = { |
03f3a910 | 489 | &dev_attr_id.attr, |
a8fb5f3d | 490 | &dev_attr_state.attr, |
5ffd00e2 | 491 | &dev_attr_monitor_id.attr, |
68234c04 | 492 | &dev_attr_class_id.attr, |
7c55e1d0 | 493 | &dev_attr_device_id.attr, |
647fa371 | 494 | &dev_attr_modalias.attr, |
76c52bbe GKH |
495 | &dev_attr_server_monitor_pending.attr, |
496 | &dev_attr_client_monitor_pending.attr, | |
1cee272b GKH |
497 | &dev_attr_server_monitor_latency.attr, |
498 | &dev_attr_client_monitor_latency.attr, | |
4947c745 GKH |
499 | &dev_attr_server_monitor_conn_id.attr, |
500 | &dev_attr_client_monitor_conn_id.attr, | |
98f4c651 GKH |
501 | &dev_attr_out_intr_mask.attr, |
502 | &dev_attr_out_read_index.attr, | |
503 | &dev_attr_out_write_index.attr, | |
504 | &dev_attr_out_read_bytes_avail.attr, | |
505 | &dev_attr_out_write_bytes_avail.attr, | |
506 | &dev_attr_in_intr_mask.attr, | |
507 | &dev_attr_in_read_index.attr, | |
508 | &dev_attr_in_write_index.attr, | |
509 | &dev_attr_in_read_bytes_avail.attr, | |
510 | &dev_attr_in_write_bytes_avail.attr, | |
042ab031 | 511 | &dev_attr_channel_vp_mapping.attr, |
7047f17d S |
512 | &dev_attr_vendor.attr, |
513 | &dev_attr_device.attr, | |
03f3a910 GKH |
514 | NULL, |
515 | }; | |
fc76936d | 516 | ATTRIBUTE_GROUPS(vmbus_dev); |
03f3a910 | 517 | |
adde2487 S |
518 | /* |
519 | * vmbus_uevent - add uevent for our device | |
520 | * | |
521 | * This routine is invoked when a device is added or removed on the vmbus to | |
522 | * generate a uevent to udev in the userspace. The udev will then look at its | |
523 | * rule and the uevent generated here to load the appropriate driver | |
0ddda660 S |
524 | * |
525 | * The alias string will be of the form vmbus:guid where guid is the string | |
526 | * representation of the device guid (each byte of the guid will be | |
527 | * represented with two hex characters. | |
adde2487 S |
528 | */ |
529 | static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) | |
530 | { | |
531 | struct hv_device *dev = device_to_hv_device(device); | |
fd776ba9 OH |
532 | int ret; |
533 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
0ddda660 | 534 | |
fd776ba9 | 535 | print_alias_name(dev, alias_name); |
0ddda660 S |
536 | ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); |
537 | return ret; | |
adde2487 S |
538 | } |
539 | ||
1b9d48f2 | 540 | static const uuid_le null_guid; |
5841a829 | 541 | |
af3ff643 | 542 | static inline bool is_null_guid(const uuid_le *guid) |
5841a829 | 543 | { |
4ae92508 | 544 | if (uuid_le_cmp(*guid, null_guid)) |
5841a829 S |
545 | return false; |
546 | return true; | |
547 | } | |
548 | ||
3037a7b6 S |
549 | /* |
550 | * Return a matching hv_vmbus_device_id pointer. | |
551 | * If there is no match, return NULL. | |
552 | */ | |
fc76936d | 553 | static const struct hv_vmbus_device_id *hv_vmbus_get_id(struct hv_driver *drv, |
af3ff643 | 554 | const uuid_le *guid) |
3037a7b6 | 555 | { |
fc76936d SH |
556 | const struct hv_vmbus_device_id *id = NULL; |
557 | struct vmbus_dynid *dynid; | |
558 | ||
559 | /* Look at the dynamic ids first, before the static ones */ | |
560 | spin_lock(&drv->dynids.lock); | |
561 | list_for_each_entry(dynid, &drv->dynids.list, node) { | |
562 | if (!uuid_le_cmp(dynid->id.guid, *guid)) { | |
563 | id = &dynid->id; | |
564 | break; | |
565 | } | |
566 | } | |
567 | spin_unlock(&drv->dynids.lock); | |
568 | ||
569 | if (id) | |
570 | return id; | |
571 | ||
572 | id = drv->id_table; | |
573 | if (id == NULL) | |
574 | return NULL; /* empty device table */ | |
575 | ||
af3ff643 | 576 | for (; !is_null_guid(&id->guid); id++) |
4ae92508 | 577 | if (!uuid_le_cmp(id->guid, *guid)) |
3037a7b6 S |
578 | return id; |
579 | ||
580 | return NULL; | |
581 | } | |
582 | ||
fc76936d SH |
583 | /* vmbus_add_dynid - add a new device ID to this driver and re-probe devices */ |
584 | static int vmbus_add_dynid(struct hv_driver *drv, uuid_le *guid) | |
585 | { | |
586 | struct vmbus_dynid *dynid; | |
587 | ||
588 | dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); | |
589 | if (!dynid) | |
590 | return -ENOMEM; | |
591 | ||
592 | dynid->id.guid = *guid; | |
593 | ||
594 | spin_lock(&drv->dynids.lock); | |
595 | list_add_tail(&dynid->node, &drv->dynids.list); | |
596 | spin_unlock(&drv->dynids.lock); | |
597 | ||
598 | return driver_attach(&drv->driver); | |
599 | } | |
600 | ||
601 | static void vmbus_free_dynids(struct hv_driver *drv) | |
602 | { | |
603 | struct vmbus_dynid *dynid, *n; | |
604 | ||
605 | spin_lock(&drv->dynids.lock); | |
606 | list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) { | |
607 | list_del(&dynid->node); | |
608 | kfree(dynid); | |
609 | } | |
610 | spin_unlock(&drv->dynids.lock); | |
611 | } | |
612 | ||
fc76936d SH |
613 | /* |
614 | * store_new_id - sysfs frontend to vmbus_add_dynid() | |
615 | * | |
616 | * Allow GUIDs to be added to an existing driver via sysfs. | |
617 | */ | |
618 | static ssize_t new_id_store(struct device_driver *driver, const char *buf, | |
619 | size_t count) | |
620 | { | |
621 | struct hv_driver *drv = drv_to_hv_drv(driver); | |
31100108 | 622 | uuid_le guid; |
fc76936d SH |
623 | ssize_t retval; |
624 | ||
31100108 AS |
625 | retval = uuid_le_to_bin(buf, &guid); |
626 | if (retval) | |
627 | return retval; | |
fc76936d SH |
628 | |
629 | if (hv_vmbus_get_id(drv, &guid)) | |
630 | return -EEXIST; | |
631 | ||
632 | retval = vmbus_add_dynid(drv, &guid); | |
633 | if (retval) | |
634 | return retval; | |
635 | return count; | |
636 | } | |
637 | static DRIVER_ATTR_WO(new_id); | |
638 | ||
639 | /* | |
640 | * store_remove_id - remove a PCI device ID from this driver | |
641 | * | |
642 | * Removes a dynamic pci device ID to this driver. | |
643 | */ | |
644 | static ssize_t remove_id_store(struct device_driver *driver, const char *buf, | |
645 | size_t count) | |
646 | { | |
647 | struct hv_driver *drv = drv_to_hv_drv(driver); | |
648 | struct vmbus_dynid *dynid, *n; | |
31100108 AS |
649 | uuid_le guid; |
650 | ssize_t retval; | |
fc76936d | 651 | |
31100108 AS |
652 | retval = uuid_le_to_bin(buf, &guid); |
653 | if (retval) | |
654 | return retval; | |
fc76936d | 655 | |
31100108 | 656 | retval = -ENODEV; |
fc76936d SH |
657 | spin_lock(&drv->dynids.lock); |
658 | list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) { | |
659 | struct hv_vmbus_device_id *id = &dynid->id; | |
660 | ||
661 | if (!uuid_le_cmp(id->guid, guid)) { | |
662 | list_del(&dynid->node); | |
663 | kfree(dynid); | |
664 | retval = count; | |
665 | break; | |
666 | } | |
667 | } | |
668 | spin_unlock(&drv->dynids.lock); | |
669 | ||
670 | return retval; | |
671 | } | |
672 | static DRIVER_ATTR_WO(remove_id); | |
673 | ||
674 | static struct attribute *vmbus_drv_attrs[] = { | |
675 | &driver_attr_new_id.attr, | |
676 | &driver_attr_remove_id.attr, | |
677 | NULL, | |
678 | }; | |
679 | ATTRIBUTE_GROUPS(vmbus_drv); | |
3037a7b6 | 680 | |
b7fc147b S |
681 | |
682 | /* | |
683 | * vmbus_match - Attempt to match the specified device to the specified driver | |
684 | */ | |
685 | static int vmbus_match(struct device *device, struct device_driver *driver) | |
686 | { | |
b7fc147b | 687 | struct hv_driver *drv = drv_to_hv_drv(driver); |
e8e27047 | 688 | struct hv_device *hv_dev = device_to_hv_device(device); |
b7fc147b | 689 | |
8981da32 DC |
690 | /* The hv_sock driver handles all hv_sock offers. */ |
691 | if (is_hvsock_channel(hv_dev->channel)) | |
692 | return drv->hvsock; | |
693 | ||
fc76936d | 694 | if (hv_vmbus_get_id(drv, &hv_dev->dev_type)) |
3037a7b6 | 695 | return 1; |
de632a2b | 696 | |
5841a829 | 697 | return 0; |
b7fc147b S |
698 | } |
699 | ||
f1f0d67b S |
700 | /* |
701 | * vmbus_probe - Add the new vmbus's child device | |
702 | */ | |
703 | static int vmbus_probe(struct device *child_device) | |
704 | { | |
705 | int ret = 0; | |
706 | struct hv_driver *drv = | |
707 | drv_to_hv_drv(child_device->driver); | |
9efd21e1 | 708 | struct hv_device *dev = device_to_hv_device(child_device); |
84946899 | 709 | const struct hv_vmbus_device_id *dev_id; |
f1f0d67b | 710 | |
fc76936d | 711 | dev_id = hv_vmbus_get_id(drv, &dev->dev_type); |
9efd21e1 | 712 | if (drv->probe) { |
84946899 | 713 | ret = drv->probe(dev, dev_id); |
b14a7b30 | 714 | if (ret != 0) |
0a46618d HJ |
715 | pr_err("probe failed for device %s (%d)\n", |
716 | dev_name(child_device), ret); | |
f1f0d67b | 717 | |
f1f0d67b | 718 | } else { |
0a46618d HJ |
719 | pr_err("probe not set for driver %s\n", |
720 | dev_name(child_device)); | |
6de925b1 | 721 | ret = -ENODEV; |
f1f0d67b S |
722 | } |
723 | return ret; | |
724 | } | |
725 | ||
c5dce3db S |
726 | /* |
727 | * vmbus_remove - Remove a vmbus device | |
728 | */ | |
729 | static int vmbus_remove(struct device *child_device) | |
730 | { | |
d15a0301 | 731 | struct hv_driver *drv; |
415b023a | 732 | struct hv_device *dev = device_to_hv_device(child_device); |
c5dce3db | 733 | |
d15a0301 S |
734 | if (child_device->driver) { |
735 | drv = drv_to_hv_drv(child_device->driver); | |
736 | if (drv->remove) | |
737 | drv->remove(dev); | |
d15a0301 | 738 | } |
c5dce3db S |
739 | |
740 | return 0; | |
741 | } | |
742 | ||
eb1bb259 S |
743 | |
744 | /* | |
745 | * vmbus_shutdown - Shutdown a vmbus device | |
746 | */ | |
747 | static void vmbus_shutdown(struct device *child_device) | |
748 | { | |
749 | struct hv_driver *drv; | |
ca6887fb | 750 | struct hv_device *dev = device_to_hv_device(child_device); |
eb1bb259 S |
751 | |
752 | ||
753 | /* The device may not be attached yet */ | |
754 | if (!child_device->driver) | |
755 | return; | |
756 | ||
757 | drv = drv_to_hv_drv(child_device->driver); | |
758 | ||
ca6887fb S |
759 | if (drv->shutdown) |
760 | drv->shutdown(dev); | |
eb1bb259 S |
761 | } |
762 | ||
086e7a56 S |
763 | |
764 | /* | |
765 | * vmbus_device_release - Final callback release of the vmbus child device | |
766 | */ | |
767 | static void vmbus_device_release(struct device *device) | |
768 | { | |
e8e27047 | 769 | struct hv_device *hv_dev = device_to_hv_device(device); |
34c6801e | 770 | struct vmbus_channel *channel = hv_dev->channel; |
086e7a56 | 771 | |
54a66265 | 772 | mutex_lock(&vmbus_connection.channel_mutex); |
192b2d78 | 773 | hv_process_channel_removal(channel->offermsg.child_relid); |
54a66265 | 774 | mutex_unlock(&vmbus_connection.channel_mutex); |
e8e27047 | 775 | kfree(hv_dev); |
086e7a56 S |
776 | |
777 | } | |
778 | ||
454f18a9 | 779 | /* The one and only one */ |
9adcac5c S |
780 | static struct bus_type hv_bus = { |
781 | .name = "vmbus", | |
782 | .match = vmbus_match, | |
783 | .shutdown = vmbus_shutdown, | |
784 | .remove = vmbus_remove, | |
785 | .probe = vmbus_probe, | |
786 | .uevent = vmbus_uevent, | |
fc76936d SH |
787 | .dev_groups = vmbus_dev_groups, |
788 | .drv_groups = vmbus_drv_groups, | |
3e7ee490 HJ |
789 | }; |
790 | ||
bf6506f6 TT |
791 | struct onmessage_work_context { |
792 | struct work_struct work; | |
793 | struct hv_message msg; | |
794 | }; | |
795 | ||
796 | static void vmbus_onmessage_work(struct work_struct *work) | |
797 | { | |
798 | struct onmessage_work_context *ctx; | |
799 | ||
09a19628 VK |
800 | /* Do not process messages if we're in DISCONNECTED state */ |
801 | if (vmbus_connection.conn_state == DISCONNECTED) | |
802 | return; | |
803 | ||
bf6506f6 TT |
804 | ctx = container_of(work, struct onmessage_work_context, |
805 | work); | |
806 | vmbus_onmessage(&ctx->msg); | |
807 | kfree(ctx); | |
808 | } | |
809 | ||
37cdd991 SH |
810 | static void hv_process_timer_expiration(struct hv_message *msg, |
811 | struct hv_per_cpu_context *hv_cpu) | |
4061ed9e | 812 | { |
37cdd991 | 813 | struct clock_event_device *dev = hv_cpu->clk_evt; |
4061ed9e S |
814 | |
815 | if (dev->event_handler) | |
816 | dev->event_handler(dev); | |
817 | ||
cd95aad5 | 818 | vmbus_signal_eom(msg, HVMSG_TIMER_EXPIRED); |
4061ed9e S |
819 | } |
820 | ||
d81274aa | 821 | void vmbus_on_msg_dpc(unsigned long data) |
36199a99 | 822 | { |
37cdd991 SH |
823 | struct hv_per_cpu_context *hv_cpu = (void *)data; |
824 | void *page_addr = hv_cpu->synic_message_page; | |
36199a99 GKH |
825 | struct hv_message *msg = (struct hv_message *)page_addr + |
826 | VMBUS_MESSAGE_SINT; | |
652594c7 | 827 | struct vmbus_channel_message_header *hdr; |
e6242fa0 | 828 | const struct vmbus_channel_message_table_entry *entry; |
bf6506f6 | 829 | struct onmessage_work_context *ctx; |
cd95aad5 | 830 | u32 message_type = msg->header.message_type; |
36199a99 | 831 | |
cd95aad5 | 832 | if (message_type == HVMSG_NONE) |
7be3e169 VK |
833 | /* no msg */ |
834 | return; | |
652594c7 | 835 | |
7be3e169 | 836 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
652594c7 | 837 | |
c9fe0f8f VK |
838 | trace_vmbus_on_msg_dpc(hdr); |
839 | ||
7be3e169 VK |
840 | if (hdr->msgtype >= CHANNELMSG_COUNT) { |
841 | WARN_ONCE(1, "unknown msgtype=%d\n", hdr->msgtype); | |
842 | goto msg_handled; | |
843 | } | |
652594c7 | 844 | |
7be3e169 VK |
845 | entry = &channel_message_table[hdr->msgtype]; |
846 | if (entry->handler_type == VMHT_BLOCKING) { | |
847 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); | |
848 | if (ctx == NULL) | |
849 | return; | |
652594c7 | 850 | |
7be3e169 VK |
851 | INIT_WORK(&ctx->work, vmbus_onmessage_work); |
852 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
652594c7 | 853 | |
54a66265 S |
854 | /* |
855 | * The host can generate a rescind message while we | |
856 | * may still be handling the original offer. We deal with | |
857 | * this condition by ensuring the processing is done on the | |
858 | * same CPU. | |
859 | */ | |
860 | switch (hdr->msgtype) { | |
861 | case CHANNELMSG_RESCIND_CHANNELOFFER: | |
862 | /* | |
863 | * If we are handling the rescind message; | |
864 | * schedule the work on the global work queue. | |
865 | */ | |
866 | schedule_work_on(vmbus_connection.connect_cpu, | |
867 | &ctx->work); | |
868 | break; | |
869 | ||
870 | case CHANNELMSG_OFFERCHANNEL: | |
871 | atomic_inc(&vmbus_connection.offer_in_progress); | |
872 | queue_work_on(vmbus_connection.connect_cpu, | |
873 | vmbus_connection.work_queue, | |
874 | &ctx->work); | |
875 | break; | |
876 | ||
877 | default: | |
878 | queue_work(vmbus_connection.work_queue, &ctx->work); | |
879 | } | |
7be3e169 VK |
880 | } else |
881 | entry->message_handler(hdr); | |
36199a99 | 882 | |
652594c7 | 883 | msg_handled: |
cd95aad5 | 884 | vmbus_signal_eom(msg, message_type); |
36199a99 GKH |
885 | } |
886 | ||
631e63a9 | 887 | |
b71e3282 SH |
888 | /* |
889 | * Direct callback for channels using other deferred processing | |
890 | */ | |
891 | static void vmbus_channel_isr(struct vmbus_channel *channel) | |
892 | { | |
893 | void (*callback_fn)(void *); | |
894 | ||
895 | callback_fn = READ_ONCE(channel->onchannel_callback); | |
896 | if (likely(callback_fn != NULL)) | |
897 | (*callback_fn)(channel->channel_callback_context); | |
898 | } | |
899 | ||
631e63a9 SH |
900 | /* |
901 | * Schedule all channels with events pending | |
902 | */ | |
903 | static void vmbus_chan_sched(struct hv_per_cpu_context *hv_cpu) | |
904 | { | |
905 | unsigned long *recv_int_page; | |
906 | u32 maxbits, relid; | |
907 | ||
908 | if (vmbus_proto_version < VERSION_WIN8) { | |
909 | maxbits = MAX_NUM_CHANNELS_SUPPORTED; | |
910 | recv_int_page = vmbus_connection.recv_int_page; | |
911 | } else { | |
912 | /* | |
913 | * When the host is win8 and beyond, the event page | |
914 | * can be directly checked to get the id of the channel | |
915 | * that has the interrupt pending. | |
916 | */ | |
917 | void *page_addr = hv_cpu->synic_event_page; | |
918 | union hv_synic_event_flags *event | |
919 | = (union hv_synic_event_flags *)page_addr + | |
920 | VMBUS_MESSAGE_SINT; | |
921 | ||
922 | maxbits = HV_EVENT_FLAGS_COUNT; | |
923 | recv_int_page = event->flags; | |
924 | } | |
925 | ||
926 | if (unlikely(!recv_int_page)) | |
927 | return; | |
928 | ||
929 | for_each_set_bit(relid, recv_int_page, maxbits) { | |
930 | struct vmbus_channel *channel; | |
931 | ||
932 | if (!sync_test_and_clear_bit(relid, recv_int_page)) | |
933 | continue; | |
934 | ||
935 | /* Special case - vmbus channel protocol msg */ | |
936 | if (relid == 0) | |
937 | continue; | |
938 | ||
8200f208 SH |
939 | rcu_read_lock(); |
940 | ||
631e63a9 | 941 | /* Find channel based on relid */ |
8200f208 | 942 | list_for_each_entry_rcu(channel, &hv_cpu->chan_list, percpu_list) { |
b71e3282 SH |
943 | if (channel->offermsg.child_relid != relid) |
944 | continue; | |
945 | ||
6f3d791f S |
946 | if (channel->rescind) |
947 | continue; | |
948 | ||
991f8f1c VK |
949 | trace_vmbus_chan_sched(channel); |
950 | ||
6981fbf3 SH |
951 | ++channel->interrupts; |
952 | ||
b71e3282 SH |
953 | switch (channel->callback_mode) { |
954 | case HV_CALL_ISR: | |
955 | vmbus_channel_isr(channel); | |
631e63a9 | 956 | break; |
b71e3282 SH |
957 | |
958 | case HV_CALL_BATCHED: | |
959 | hv_begin_read(&channel->inbound); | |
960 | /* fallthrough */ | |
961 | case HV_CALL_DIRECT: | |
962 | tasklet_schedule(&channel->callback_event); | |
631e63a9 SH |
963 | } |
964 | } | |
8200f208 SH |
965 | |
966 | rcu_read_unlock(); | |
631e63a9 SH |
967 | } |
968 | } | |
969 | ||
76d388cd | 970 | static void vmbus_isr(void) |
36199a99 | 971 | { |
37cdd991 SH |
972 | struct hv_per_cpu_context *hv_cpu |
973 | = this_cpu_ptr(hv_context.cpu_context); | |
974 | void *page_addr = hv_cpu->synic_event_page; | |
36199a99 GKH |
975 | struct hv_message *msg; |
976 | union hv_synic_event_flags *event; | |
ae4636e6 | 977 | bool handled = false; |
36199a99 | 978 | |
37cdd991 | 979 | if (unlikely(page_addr == NULL)) |
76d388cd | 980 | return; |
5ab05951 S |
981 | |
982 | event = (union hv_synic_event_flags *)page_addr + | |
983 | VMBUS_MESSAGE_SINT; | |
7341d908 S |
984 | /* |
985 | * Check for events before checking for messages. This is the order | |
986 | * in which events and messages are checked in Windows guests on | |
987 | * Hyper-V, and the Windows team suggested we do the same. | |
988 | */ | |
36199a99 | 989 | |
6552ecd7 S |
990 | if ((vmbus_proto_version == VERSION_WS2008) || |
991 | (vmbus_proto_version == VERSION_WIN7)) { | |
36199a99 | 992 | |
6552ecd7 | 993 | /* Since we are a child, we only need to check bit 0 */ |
5c1bec61 | 994 | if (sync_test_and_clear_bit(0, event->flags)) |
6552ecd7 | 995 | handled = true; |
6552ecd7 S |
996 | } else { |
997 | /* | |
998 | * Our host is win8 or above. The signaling mechanism | |
999 | * has changed and we can directly look at the event page. | |
1000 | * If bit n is set then we have an interrup on the channel | |
1001 | * whose id is n. | |
1002 | */ | |
ae4636e6 | 1003 | handled = true; |
ae4636e6 | 1004 | } |
793be9c7 | 1005 | |
6552ecd7 | 1006 | if (handled) |
631e63a9 | 1007 | vmbus_chan_sched(hv_cpu); |
6552ecd7 | 1008 | |
37cdd991 | 1009 | page_addr = hv_cpu->synic_message_page; |
7341d908 S |
1010 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; |
1011 | ||
1012 | /* Check if there are actual msgs to be processed */ | |
4061ed9e S |
1013 | if (msg->header.message_type != HVMSG_NONE) { |
1014 | if (msg->header.message_type == HVMSG_TIMER_EXPIRED) | |
37cdd991 | 1015 | hv_process_timer_expiration(msg, hv_cpu); |
4061ed9e | 1016 | else |
37cdd991 | 1017 | tasklet_schedule(&hv_cpu->msg_dpc); |
4061ed9e | 1018 | } |
4b44f2d1 SM |
1019 | |
1020 | add_interrupt_randomness(HYPERVISOR_CALLBACK_VECTOR, 0); | |
793be9c7 S |
1021 | } |
1022 | ||
e513229b | 1023 | |
3e189519 | 1024 | /* |
90c9960e GKH |
1025 | * vmbus_bus_init -Main vmbus driver initialization routine. |
1026 | * | |
1027 | * Here, we | |
0686e4f4 | 1028 | * - initialize the vmbus driver context |
0686e4f4 | 1029 | * - invoke the vmbus hv main init routine |
0686e4f4 | 1030 | * - retrieve the channel offers |
90c9960e | 1031 | */ |
efc26722 | 1032 | static int vmbus_bus_init(void) |
3e7ee490 | 1033 | { |
90c9960e | 1034 | int ret; |
3e7ee490 | 1035 | |
6d26e38f GKH |
1036 | /* Hypervisor initialization...setup hypercall page..etc */ |
1037 | ret = hv_init(); | |
90c9960e | 1038 | if (ret != 0) { |
0a46618d | 1039 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); |
d6c1c5de | 1040 | return ret; |
3e7ee490 HJ |
1041 | } |
1042 | ||
9adcac5c | 1043 | ret = bus_register(&hv_bus); |
d6c1c5de | 1044 | if (ret) |
d6f3609d | 1045 | return ret; |
3e7ee490 | 1046 | |
76d388cd | 1047 | hv_setup_vmbus_irq(vmbus_isr); |
3e7ee490 | 1048 | |
2608fb65 JW |
1049 | ret = hv_synic_alloc(); |
1050 | if (ret) | |
1051 | goto err_alloc; | |
800b6902 | 1052 | /* |
302a3c0f | 1053 | * Initialize the per-cpu interrupt state and |
800b6902 S |
1054 | * connect to the host. |
1055 | */ | |
76d36ab7 VK |
1056 | ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/hyperv:online", |
1057 | hv_synic_init, hv_synic_cleanup); | |
1058 | if (ret < 0) | |
1059 | goto err_alloc; | |
1060 | hyperv_cpuhp_online = ret; | |
1061 | ||
800b6902 | 1062 | ret = vmbus_connect(); |
8b9987e9 | 1063 | if (ret) |
17efbee8 | 1064 | goto err_connect; |
800b6902 | 1065 | |
96c1d058 NM |
1066 | /* |
1067 | * Only register if the crash MSRs are available | |
1068 | */ | |
cc2dd402 | 1069 | if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) { |
510f7aef | 1070 | register_die_notifier(&hyperv_die_block); |
96c1d058 NM |
1071 | atomic_notifier_chain_register(&panic_notifier_list, |
1072 | &hyperv_panic_block); | |
1073 | } | |
1074 | ||
2d6e882b | 1075 | vmbus_request_offers(); |
8b5d6d3b | 1076 | |
d6c1c5de | 1077 | return 0; |
8b9987e9 | 1078 | |
17efbee8 | 1079 | err_connect: |
76d36ab7 | 1080 | cpuhp_remove_state(hyperv_cpuhp_online); |
2608fb65 JW |
1081 | err_alloc: |
1082 | hv_synic_free(); | |
76d388cd | 1083 | hv_remove_vmbus_irq(); |
8b9987e9 | 1084 | |
8b9987e9 S |
1085 | bus_unregister(&hv_bus); |
1086 | ||
8b9987e9 | 1087 | return ret; |
3e7ee490 HJ |
1088 | } |
1089 | ||
90c9960e | 1090 | /** |
35464483 JO |
1091 | * __vmbus_child_driver_register() - Register a vmbus's driver |
1092 | * @hv_driver: Pointer to driver structure you want to register | |
768fa219 GKH |
1093 | * @owner: owner module of the drv |
1094 | * @mod_name: module name string | |
3e189519 HJ |
1095 | * |
1096 | * Registers the given driver with Linux through the 'driver_register()' call | |
768fa219 | 1097 | * and sets up the hyper-v vmbus handling for this driver. |
3e189519 HJ |
1098 | * It will return the state of the 'driver_register()' call. |
1099 | * | |
90c9960e | 1100 | */ |
768fa219 | 1101 | int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) |
3e7ee490 | 1102 | { |
5d48a1c2 | 1103 | int ret; |
3e7ee490 | 1104 | |
768fa219 | 1105 | pr_info("registering driver %s\n", hv_driver->name); |
3e7ee490 | 1106 | |
cf6a2eac S |
1107 | ret = vmbus_exists(); |
1108 | if (ret < 0) | |
1109 | return ret; | |
1110 | ||
768fa219 GKH |
1111 | hv_driver->driver.name = hv_driver->name; |
1112 | hv_driver->driver.owner = owner; | |
1113 | hv_driver->driver.mod_name = mod_name; | |
1114 | hv_driver->driver.bus = &hv_bus; | |
3e7ee490 | 1115 | |
fc76936d SH |
1116 | spin_lock_init(&hv_driver->dynids.lock); |
1117 | INIT_LIST_HEAD(&hv_driver->dynids.list); | |
1118 | ||
768fa219 | 1119 | ret = driver_register(&hv_driver->driver); |
3e7ee490 | 1120 | |
5d48a1c2 | 1121 | return ret; |
3e7ee490 | 1122 | } |
768fa219 | 1123 | EXPORT_SYMBOL_GPL(__vmbus_driver_register); |
3e7ee490 | 1124 | |
90c9960e | 1125 | /** |
768fa219 | 1126 | * vmbus_driver_unregister() - Unregister a vmbus's driver |
35464483 JO |
1127 | * @hv_driver: Pointer to driver structure you want to |
1128 | * un-register | |
3e189519 | 1129 | * |
768fa219 GKH |
1130 | * Un-register the given driver that was previous registered with a call to |
1131 | * vmbus_driver_register() | |
90c9960e | 1132 | */ |
768fa219 | 1133 | void vmbus_driver_unregister(struct hv_driver *hv_driver) |
3e7ee490 | 1134 | { |
768fa219 | 1135 | pr_info("unregistering driver %s\n", hv_driver->name); |
3e7ee490 | 1136 | |
fc76936d | 1137 | if (!vmbus_exists()) { |
8f257a14 | 1138 | driver_unregister(&hv_driver->driver); |
fc76936d SH |
1139 | vmbus_free_dynids(hv_driver); |
1140 | } | |
3e7ee490 | 1141 | } |
768fa219 | 1142 | EXPORT_SYMBOL_GPL(vmbus_driver_unregister); |
3e7ee490 | 1143 | |
c2e5df61 SH |
1144 | |
1145 | /* | |
1146 | * Called when last reference to channel is gone. | |
1147 | */ | |
1148 | static void vmbus_chan_release(struct kobject *kobj) | |
1149 | { | |
1150 | struct vmbus_channel *channel | |
1151 | = container_of(kobj, struct vmbus_channel, kobj); | |
1152 | ||
1153 | kfree_rcu(channel, rcu); | |
1154 | } | |
1155 | ||
1156 | struct vmbus_chan_attribute { | |
1157 | struct attribute attr; | |
1158 | ssize_t (*show)(const struct vmbus_channel *chan, char *buf); | |
1159 | ssize_t (*store)(struct vmbus_channel *chan, | |
1160 | const char *buf, size_t count); | |
1161 | }; | |
1162 | #define VMBUS_CHAN_ATTR(_name, _mode, _show, _store) \ | |
1163 | struct vmbus_chan_attribute chan_attr_##_name \ | |
1164 | = __ATTR(_name, _mode, _show, _store) | |
1165 | #define VMBUS_CHAN_ATTR_RW(_name) \ | |
1166 | struct vmbus_chan_attribute chan_attr_##_name = __ATTR_RW(_name) | |
1167 | #define VMBUS_CHAN_ATTR_RO(_name) \ | |
1168 | struct vmbus_chan_attribute chan_attr_##_name = __ATTR_RO(_name) | |
1169 | #define VMBUS_CHAN_ATTR_WO(_name) \ | |
1170 | struct vmbus_chan_attribute chan_attr_##_name = __ATTR_WO(_name) | |
1171 | ||
1172 | static ssize_t vmbus_chan_attr_show(struct kobject *kobj, | |
1173 | struct attribute *attr, char *buf) | |
1174 | { | |
1175 | const struct vmbus_chan_attribute *attribute | |
1176 | = container_of(attr, struct vmbus_chan_attribute, attr); | |
1177 | const struct vmbus_channel *chan | |
1178 | = container_of(kobj, struct vmbus_channel, kobj); | |
1179 | ||
1180 | if (!attribute->show) | |
1181 | return -EIO; | |
1182 | ||
86718da7 SH |
1183 | if (chan->state != CHANNEL_OPENED_STATE) |
1184 | return -EINVAL; | |
1185 | ||
c2e5df61 SH |
1186 | return attribute->show(chan, buf); |
1187 | } | |
1188 | ||
1189 | static const struct sysfs_ops vmbus_chan_sysfs_ops = { | |
1190 | .show = vmbus_chan_attr_show, | |
1191 | }; | |
1192 | ||
1193 | static ssize_t out_mask_show(const struct vmbus_channel *channel, char *buf) | |
1194 | { | |
1195 | const struct hv_ring_buffer_info *rbi = &channel->outbound; | |
1196 | ||
1197 | return sprintf(buf, "%u\n", rbi->ring_buffer->interrupt_mask); | |
1198 | } | |
1199 | VMBUS_CHAN_ATTR_RO(out_mask); | |
1200 | ||
1201 | static ssize_t in_mask_show(const struct vmbus_channel *channel, char *buf) | |
1202 | { | |
1203 | const struct hv_ring_buffer_info *rbi = &channel->inbound; | |
1204 | ||
1205 | return sprintf(buf, "%u\n", rbi->ring_buffer->interrupt_mask); | |
1206 | } | |
1207 | VMBUS_CHAN_ATTR_RO(in_mask); | |
1208 | ||
1209 | static ssize_t read_avail_show(const struct vmbus_channel *channel, char *buf) | |
1210 | { | |
1211 | const struct hv_ring_buffer_info *rbi = &channel->inbound; | |
1212 | ||
1213 | return sprintf(buf, "%u\n", hv_get_bytes_to_read(rbi)); | |
1214 | } | |
1215 | VMBUS_CHAN_ATTR_RO(read_avail); | |
1216 | ||
1217 | static ssize_t write_avail_show(const struct vmbus_channel *channel, char *buf) | |
1218 | { | |
1219 | const struct hv_ring_buffer_info *rbi = &channel->outbound; | |
1220 | ||
1221 | return sprintf(buf, "%u\n", hv_get_bytes_to_write(rbi)); | |
1222 | } | |
1223 | VMBUS_CHAN_ATTR_RO(write_avail); | |
1224 | ||
1225 | static ssize_t show_target_cpu(const struct vmbus_channel *channel, char *buf) | |
1226 | { | |
1227 | return sprintf(buf, "%u\n", channel->target_cpu); | |
1228 | } | |
1229 | VMBUS_CHAN_ATTR(cpu, S_IRUGO, show_target_cpu, NULL); | |
1230 | ||
1231 | static ssize_t channel_pending_show(const struct vmbus_channel *channel, | |
1232 | char *buf) | |
1233 | { | |
1234 | return sprintf(buf, "%d\n", | |
1235 | channel_pending(channel, | |
1236 | vmbus_connection.monitor_pages[1])); | |
1237 | } | |
1238 | VMBUS_CHAN_ATTR(pending, S_IRUGO, channel_pending_show, NULL); | |
1239 | ||
1240 | static ssize_t channel_latency_show(const struct vmbus_channel *channel, | |
1241 | char *buf) | |
1242 | { | |
1243 | return sprintf(buf, "%d\n", | |
1244 | channel_latency(channel, | |
1245 | vmbus_connection.monitor_pages[1])); | |
1246 | } | |
1247 | VMBUS_CHAN_ATTR(latency, S_IRUGO, channel_latency_show, NULL); | |
1248 | ||
6981fbf3 SH |
1249 | static ssize_t channel_interrupts_show(const struct vmbus_channel *channel, char *buf) |
1250 | { | |
1251 | return sprintf(buf, "%llu\n", channel->interrupts); | |
1252 | } | |
1253 | VMBUS_CHAN_ATTR(interrupts, S_IRUGO, channel_interrupts_show, NULL); | |
1254 | ||
1255 | static ssize_t channel_events_show(const struct vmbus_channel *channel, char *buf) | |
1256 | { | |
1257 | return sprintf(buf, "%llu\n", channel->sig_events); | |
1258 | } | |
1259 | VMBUS_CHAN_ATTR(events, S_IRUGO, channel_events_show, NULL); | |
1260 | ||
c2e5df61 SH |
1261 | static struct attribute *vmbus_chan_attrs[] = { |
1262 | &chan_attr_out_mask.attr, | |
1263 | &chan_attr_in_mask.attr, | |
1264 | &chan_attr_read_avail.attr, | |
1265 | &chan_attr_write_avail.attr, | |
1266 | &chan_attr_cpu.attr, | |
1267 | &chan_attr_pending.attr, | |
1268 | &chan_attr_latency.attr, | |
6981fbf3 SH |
1269 | &chan_attr_interrupts.attr, |
1270 | &chan_attr_events.attr, | |
c2e5df61 SH |
1271 | NULL |
1272 | }; | |
1273 | ||
1274 | static struct kobj_type vmbus_chan_ktype = { | |
1275 | .sysfs_ops = &vmbus_chan_sysfs_ops, | |
1276 | .release = vmbus_chan_release, | |
1277 | .default_attrs = vmbus_chan_attrs, | |
1278 | }; | |
1279 | ||
1280 | /* | |
1281 | * vmbus_add_channel_kobj - setup a sub-directory under device/channels | |
1282 | */ | |
1283 | int vmbus_add_channel_kobj(struct hv_device *dev, struct vmbus_channel *channel) | |
1284 | { | |
1285 | struct kobject *kobj = &channel->kobj; | |
1286 | u32 relid = channel->offermsg.child_relid; | |
1287 | int ret; | |
1288 | ||
1289 | kobj->kset = dev->channels_kset; | |
1290 | ret = kobject_init_and_add(kobj, &vmbus_chan_ktype, NULL, | |
1291 | "%u", relid); | |
1292 | if (ret) | |
1293 | return ret; | |
1294 | ||
1295 | kobject_uevent(kobj, KOBJ_ADD); | |
1296 | ||
1297 | return 0; | |
1298 | } | |
1299 | ||
3e189519 | 1300 | /* |
f2c73011 | 1301 | * vmbus_device_create - Creates and registers a new child device |
3e189519 | 1302 | * on the vmbus. |
90c9960e | 1303 | */ |
1b9d48f2 | 1304 | struct hv_device *vmbus_device_create(const uuid_le *type, |
1305 | const uuid_le *instance, | |
1306 | struct vmbus_channel *channel) | |
3e7ee490 | 1307 | { |
3d3b5518 | 1308 | struct hv_device *child_device_obj; |
3e7ee490 | 1309 | |
6bad88da S |
1310 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); |
1311 | if (!child_device_obj) { | |
0a46618d | 1312 | pr_err("Unable to allocate device object for child device\n"); |
3e7ee490 HJ |
1313 | return NULL; |
1314 | } | |
1315 | ||
cae5b843 | 1316 | child_device_obj->channel = channel; |
358d2ee2 | 1317 | memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); |
ca623ad3 | 1318 | memcpy(&child_device_obj->dev_instance, instance, |
358d2ee2 | 1319 | sizeof(uuid_le)); |
7047f17d | 1320 | child_device_obj->vendor_id = 0x1414; /* MSFT vendor ID */ |
3e7ee490 | 1321 | |
3e7ee490 | 1322 | |
3e7ee490 HJ |
1323 | return child_device_obj; |
1324 | } | |
1325 | ||
3e189519 | 1326 | /* |
22794281 | 1327 | * vmbus_device_register - Register the child device |
90c9960e | 1328 | */ |
22794281 | 1329 | int vmbus_device_register(struct hv_device *child_device_obj) |
3e7ee490 | 1330 | { |
c2e5df61 SH |
1331 | struct kobject *kobj = &child_device_obj->device.kobj; |
1332 | int ret; | |
6bad88da | 1333 | |
f6b2db08 | 1334 | dev_set_name(&child_device_obj->device, "%pUl", |
b294809d | 1335 | child_device_obj->channel->offermsg.offer.if_instance.b); |
3e7ee490 | 1336 | |
0bce28b6 | 1337 | child_device_obj->device.bus = &hv_bus; |
607c1a11 | 1338 | child_device_obj->device.parent = &hv_acpi_dev->dev; |
6bad88da | 1339 | child_device_obj->device.release = vmbus_device_release; |
3e7ee490 | 1340 | |
90c9960e GKH |
1341 | /* |
1342 | * Register with the LDM. This will kick off the driver/device | |
1343 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
1344 | */ | |
6bad88da | 1345 | ret = device_register(&child_device_obj->device); |
c2e5df61 | 1346 | if (ret) { |
0a46618d | 1347 | pr_err("Unable to register child device\n"); |
c2e5df61 SH |
1348 | return ret; |
1349 | } | |
1350 | ||
1351 | child_device_obj->channels_kset = kset_create_and_add("channels", | |
1352 | NULL, kobj); | |
1353 | if (!child_device_obj->channels_kset) { | |
1354 | ret = -ENOMEM; | |
1355 | goto err_dev_unregister; | |
1356 | } | |
1357 | ||
1358 | ret = vmbus_add_channel_kobj(child_device_obj, | |
1359 | child_device_obj->channel); | |
1360 | if (ret) { | |
1361 | pr_err("Unable to register primary channeln"); | |
1362 | goto err_kset_unregister; | |
1363 | } | |
1364 | ||
1365 | return 0; | |
1366 | ||
1367 | err_kset_unregister: | |
1368 | kset_unregister(child_device_obj->channels_kset); | |
3e7ee490 | 1369 | |
c2e5df61 SH |
1370 | err_dev_unregister: |
1371 | device_unregister(&child_device_obj->device); | |
3e7ee490 HJ |
1372 | return ret; |
1373 | } | |
1374 | ||
3e189519 | 1375 | /* |
696453ba | 1376 | * vmbus_device_unregister - Remove the specified child device |
3e189519 | 1377 | * from the vmbus. |
90c9960e | 1378 | */ |
696453ba | 1379 | void vmbus_device_unregister(struct hv_device *device_obj) |
3e7ee490 | 1380 | { |
84672369 FS |
1381 | pr_debug("child device %s unregistered\n", |
1382 | dev_name(&device_obj->device)); | |
1383 | ||
869b5567 DC |
1384 | kset_unregister(device_obj->channels_kset); |
1385 | ||
90c9960e GKH |
1386 | /* |
1387 | * Kick off the process of unregistering the device. | |
1388 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
1389 | */ | |
6bad88da | 1390 | device_unregister(&device_obj->device); |
3e7ee490 HJ |
1391 | } |
1392 | ||
3e7ee490 | 1393 | |
b0069f43 | 1394 | /* |
7f163a6f | 1395 | * VMBUS is an acpi enumerated device. Get the information we |
90f34535 | 1396 | * need from DSDT. |
b0069f43 | 1397 | */ |
7f163a6f | 1398 | #define VTPM_BASE_ADDRESS 0xfed40000 |
90f34535 | 1399 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx) |
b0069f43 | 1400 | { |
7f163a6f JO |
1401 | resource_size_t start = 0; |
1402 | resource_size_t end = 0; | |
1403 | struct resource *new_res; | |
1404 | struct resource **old_res = &hyperv_mmio; | |
1405 | struct resource **prev_res = NULL; | |
1406 | ||
90f34535 | 1407 | switch (res->type) { |
7f163a6f JO |
1408 | |
1409 | /* | |
1410 | * "Address" descriptors are for bus windows. Ignore | |
1411 | * "memory" descriptors, which are for registers on | |
1412 | * devices. | |
1413 | */ | |
1414 | case ACPI_RESOURCE_TYPE_ADDRESS32: | |
1415 | start = res->data.address32.address.minimum; | |
1416 | end = res->data.address32.address.maximum; | |
4eb923f8 | 1417 | break; |
b0069f43 | 1418 | |
90f34535 | 1419 | case ACPI_RESOURCE_TYPE_ADDRESS64: |
7f163a6f JO |
1420 | start = res->data.address64.address.minimum; |
1421 | end = res->data.address64.address.maximum; | |
4eb923f8 | 1422 | break; |
7f163a6f JO |
1423 | |
1424 | default: | |
1425 | /* Unused resource type */ | |
1426 | return AE_OK; | |
1427 | ||
b0069f43 | 1428 | } |
7f163a6f JO |
1429 | /* |
1430 | * Ignore ranges that are below 1MB, as they're not | |
1431 | * necessary or useful here. | |
1432 | */ | |
1433 | if (end < 0x100000) | |
1434 | return AE_OK; | |
1435 | ||
1436 | new_res = kzalloc(sizeof(*new_res), GFP_ATOMIC); | |
1437 | if (!new_res) | |
1438 | return AE_NO_MEMORY; | |
1439 | ||
1440 | /* If this range overlaps the virtual TPM, truncate it. */ | |
1441 | if (end > VTPM_BASE_ADDRESS && start < VTPM_BASE_ADDRESS) | |
1442 | end = VTPM_BASE_ADDRESS; | |
1443 | ||
1444 | new_res->name = "hyperv mmio"; | |
1445 | new_res->flags = IORESOURCE_MEM; | |
1446 | new_res->start = start; | |
1447 | new_res->end = end; | |
1448 | ||
40f26f31 | 1449 | /* |
40f26f31 JO |
1450 | * If two ranges are adjacent, merge them. |
1451 | */ | |
7f163a6f JO |
1452 | do { |
1453 | if (!*old_res) { | |
1454 | *old_res = new_res; | |
1455 | break; | |
1456 | } | |
1457 | ||
40f26f31 JO |
1458 | if (((*old_res)->end + 1) == new_res->start) { |
1459 | (*old_res)->end = new_res->end; | |
1460 | kfree(new_res); | |
1461 | break; | |
1462 | } | |
1463 | ||
1464 | if ((*old_res)->start == new_res->end + 1) { | |
1465 | (*old_res)->start = new_res->start; | |
1466 | kfree(new_res); | |
1467 | break; | |
1468 | } | |
1469 | ||
23a06831 | 1470 | if ((*old_res)->start > new_res->end) { |
7f163a6f JO |
1471 | new_res->sibling = *old_res; |
1472 | if (prev_res) | |
1473 | (*prev_res)->sibling = new_res; | |
1474 | *old_res = new_res; | |
1475 | break; | |
1476 | } | |
1477 | ||
1478 | prev_res = old_res; | |
1479 | old_res = &(*old_res)->sibling; | |
1480 | ||
1481 | } while (1); | |
b0069f43 S |
1482 | |
1483 | return AE_OK; | |
1484 | } | |
1485 | ||
7f163a6f JO |
1486 | static int vmbus_acpi_remove(struct acpi_device *device) |
1487 | { | |
1488 | struct resource *cur_res; | |
1489 | struct resource *next_res; | |
1490 | ||
1491 | if (hyperv_mmio) { | |
6d146aef JO |
1492 | if (fb_mmio) { |
1493 | __release_region(hyperv_mmio, fb_mmio->start, | |
1494 | resource_size(fb_mmio)); | |
1495 | fb_mmio = NULL; | |
1496 | } | |
1497 | ||
7f163a6f JO |
1498 | for (cur_res = hyperv_mmio; cur_res; cur_res = next_res) { |
1499 | next_res = cur_res->sibling; | |
1500 | kfree(cur_res); | |
1501 | } | |
1502 | } | |
1503 | ||
1504 | return 0; | |
1505 | } | |
1506 | ||
6d146aef JO |
1507 | static void vmbus_reserve_fb(void) |
1508 | { | |
1509 | int size; | |
1510 | /* | |
1511 | * Make a claim for the frame buffer in the resource tree under the | |
1512 | * first node, which will be the one below 4GB. The length seems to | |
1513 | * be underreported, particularly in a Generation 1 VM. So start out | |
1514 | * reserving a larger area and make it smaller until it succeeds. | |
1515 | */ | |
1516 | ||
1517 | if (screen_info.lfb_base) { | |
1518 | if (efi_enabled(EFI_BOOT)) | |
1519 | size = max_t(__u32, screen_info.lfb_size, 0x800000); | |
1520 | else | |
1521 | size = max_t(__u32, screen_info.lfb_size, 0x4000000); | |
1522 | ||
1523 | for (; !fb_mmio && (size >= 0x100000); size >>= 1) { | |
1524 | fb_mmio = __request_region(hyperv_mmio, | |
1525 | screen_info.lfb_base, size, | |
1526 | fb_mmio_name, 0); | |
1527 | } | |
1528 | } | |
1529 | } | |
1530 | ||
35464483 JO |
1531 | /** |
1532 | * vmbus_allocate_mmio() - Pick a memory-mapped I/O range. | |
1533 | * @new: If successful, supplied a pointer to the | |
1534 | * allocated MMIO space. | |
1535 | * @device_obj: Identifies the caller | |
1536 | * @min: Minimum guest physical address of the | |
1537 | * allocation | |
1538 | * @max: Maximum guest physical address | |
1539 | * @size: Size of the range to be allocated | |
1540 | * @align: Alignment of the range to be allocated | |
1541 | * @fb_overlap_ok: Whether this allocation can be allowed | |
1542 | * to overlap the video frame buffer. | |
1543 | * | |
1544 | * This function walks the resources granted to VMBus by the | |
1545 | * _CRS object in the ACPI namespace underneath the parent | |
1546 | * "bridge" whether that's a root PCI bus in the Generation 1 | |
1547 | * case or a Module Device in the Generation 2 case. It then | |
1548 | * attempts to allocate from the global MMIO pool in a way that | |
1549 | * matches the constraints supplied in these parameters and by | |
1550 | * that _CRS. | |
1551 | * | |
1552 | * Return: 0 on success, -errno on failure | |
1553 | */ | |
1554 | int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj, | |
1555 | resource_size_t min, resource_size_t max, | |
1556 | resource_size_t size, resource_size_t align, | |
1557 | bool fb_overlap_ok) | |
1558 | { | |
be000f93 | 1559 | struct resource *iter, *shadow; |
ea37a6b8 | 1560 | resource_size_t range_min, range_max, start; |
35464483 | 1561 | const char *dev_n = dev_name(&device_obj->device); |
ea37a6b8 | 1562 | int retval; |
e16dad6b JO |
1563 | |
1564 | retval = -ENXIO; | |
1565 | down(&hyperv_mmio_lock); | |
35464483 | 1566 | |
ea37a6b8 JO |
1567 | /* |
1568 | * If overlaps with frame buffers are allowed, then first attempt to | |
1569 | * make the allocation from within the reserved region. Because it | |
1570 | * is already reserved, no shadow allocation is necessary. | |
1571 | */ | |
1572 | if (fb_overlap_ok && fb_mmio && !(min > fb_mmio->end) && | |
1573 | !(max < fb_mmio->start)) { | |
1574 | ||
1575 | range_min = fb_mmio->start; | |
1576 | range_max = fb_mmio->end; | |
1577 | start = (range_min + align - 1) & ~(align - 1); | |
1578 | for (; start + size - 1 <= range_max; start += align) { | |
1579 | *new = request_mem_region_exclusive(start, size, dev_n); | |
1580 | if (*new) { | |
1581 | retval = 0; | |
1582 | goto exit; | |
1583 | } | |
1584 | } | |
1585 | } | |
1586 | ||
35464483 JO |
1587 | for (iter = hyperv_mmio; iter; iter = iter->sibling) { |
1588 | if ((iter->start >= max) || (iter->end <= min)) | |
1589 | continue; | |
1590 | ||
1591 | range_min = iter->start; | |
1592 | range_max = iter->end; | |
ea37a6b8 JO |
1593 | start = (range_min + align - 1) & ~(align - 1); |
1594 | for (; start + size - 1 <= range_max; start += align) { | |
1595 | shadow = __request_region(iter, start, size, NULL, | |
1596 | IORESOURCE_BUSY); | |
1597 | if (!shadow) | |
1598 | continue; | |
1599 | ||
1600 | *new = request_mem_region_exclusive(start, size, dev_n); | |
1601 | if (*new) { | |
1602 | shadow->name = (char *)*new; | |
1603 | retval = 0; | |
1604 | goto exit; | |
35464483 JO |
1605 | } |
1606 | ||
ea37a6b8 | 1607 | __release_region(iter, start, size); |
35464483 JO |
1608 | } |
1609 | } | |
1610 | ||
e16dad6b JO |
1611 | exit: |
1612 | up(&hyperv_mmio_lock); | |
1613 | return retval; | |
35464483 JO |
1614 | } |
1615 | EXPORT_SYMBOL_GPL(vmbus_allocate_mmio); | |
1616 | ||
97fb77dc JO |
1617 | /** |
1618 | * vmbus_free_mmio() - Free a memory-mapped I/O range. | |
1619 | * @start: Base address of region to release. | |
1620 | * @size: Size of the range to be allocated | |
1621 | * | |
1622 | * This function releases anything requested by | |
1623 | * vmbus_mmio_allocate(). | |
1624 | */ | |
1625 | void vmbus_free_mmio(resource_size_t start, resource_size_t size) | |
1626 | { | |
be000f93 JO |
1627 | struct resource *iter; |
1628 | ||
1629 | down(&hyperv_mmio_lock); | |
1630 | for (iter = hyperv_mmio; iter; iter = iter->sibling) { | |
1631 | if ((iter->start >= start + size) || (iter->end <= start)) | |
1632 | continue; | |
1633 | ||
1634 | __release_region(iter, start, size); | |
1635 | } | |
97fb77dc | 1636 | release_mem_region(start, size); |
be000f93 | 1637 | up(&hyperv_mmio_lock); |
97fb77dc JO |
1638 | |
1639 | } | |
1640 | EXPORT_SYMBOL_GPL(vmbus_free_mmio); | |
1641 | ||
b0069f43 S |
1642 | static int vmbus_acpi_add(struct acpi_device *device) |
1643 | { | |
1644 | acpi_status result; | |
90f34535 | 1645 | int ret_val = -ENODEV; |
7f163a6f | 1646 | struct acpi_device *ancestor; |
b0069f43 | 1647 | |
607c1a11 S |
1648 | hv_acpi_dev = device; |
1649 | ||
0a4425b6 | 1650 | result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
90f34535 | 1651 | vmbus_walk_resources, NULL); |
b0069f43 | 1652 | |
90f34535 S |
1653 | if (ACPI_FAILURE(result)) |
1654 | goto acpi_walk_err; | |
1655 | /* | |
7f163a6f JO |
1656 | * Some ancestor of the vmbus acpi device (Gen1 or Gen2 |
1657 | * firmware) is the VMOD that has the mmio ranges. Get that. | |
90f34535 | 1658 | */ |
7f163a6f JO |
1659 | for (ancestor = device->parent; ancestor; ancestor = ancestor->parent) { |
1660 | result = acpi_walk_resources(ancestor->handle, METHOD_NAME__CRS, | |
1661 | vmbus_walk_resources, NULL); | |
90f34535 S |
1662 | |
1663 | if (ACPI_FAILURE(result)) | |
7f163a6f | 1664 | continue; |
6d146aef JO |
1665 | if (hyperv_mmio) { |
1666 | vmbus_reserve_fb(); | |
7f163a6f | 1667 | break; |
6d146aef | 1668 | } |
b0069f43 | 1669 | } |
90f34535 S |
1670 | ret_val = 0; |
1671 | ||
1672 | acpi_walk_err: | |
b0069f43 | 1673 | complete(&probe_event); |
7f163a6f JO |
1674 | if (ret_val) |
1675 | vmbus_acpi_remove(device); | |
90f34535 | 1676 | return ret_val; |
b0069f43 S |
1677 | } |
1678 | ||
1679 | static const struct acpi_device_id vmbus_acpi_device_ids[] = { | |
1680 | {"VMBUS", 0}, | |
9d7b18d1 | 1681 | {"VMBus", 0}, |
b0069f43 S |
1682 | {"", 0}, |
1683 | }; | |
1684 | MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); | |
1685 | ||
1686 | static struct acpi_driver vmbus_acpi_driver = { | |
1687 | .name = "vmbus", | |
1688 | .ids = vmbus_acpi_device_ids, | |
1689 | .ops = { | |
1690 | .add = vmbus_acpi_add, | |
e4ecb41c | 1691 | .remove = vmbus_acpi_remove, |
b0069f43 S |
1692 | }, |
1693 | }; | |
1694 | ||
2517281d VK |
1695 | static void hv_kexec_handler(void) |
1696 | { | |
2517281d | 1697 | hv_synic_clockevents_cleanup(); |
75ff3a8a | 1698 | vmbus_initiate_unload(false); |
523b9408 VK |
1699 | vmbus_connection.conn_state = DISCONNECTED; |
1700 | /* Make sure conn_state is set as hv_synic_cleanup checks for it */ | |
1701 | mb(); | |
76d36ab7 | 1702 | cpuhp_remove_state(hyperv_cpuhp_online); |
d6f3609d | 1703 | hyperv_cleanup(); |
2517281d VK |
1704 | }; |
1705 | ||
b4370df2 VK |
1706 | static void hv_crash_handler(struct pt_regs *regs) |
1707 | { | |
75ff3a8a | 1708 | vmbus_initiate_unload(true); |
b4370df2 VK |
1709 | /* |
1710 | * In crash handler we can't schedule synic cleanup for all CPUs, | |
1711 | * doing the cleanup for current CPU only. This should be sufficient | |
1712 | * for kdump. | |
1713 | */ | |
523b9408 | 1714 | vmbus_connection.conn_state = DISCONNECTED; |
76d36ab7 | 1715 | hv_synic_cleanup(smp_processor_id()); |
d6f3609d | 1716 | hyperv_cleanup(); |
b4370df2 VK |
1717 | }; |
1718 | ||
607c1a11 | 1719 | static int __init hv_acpi_init(void) |
1168ac22 | 1720 | { |
2dda95f8 | 1721 | int ret, t; |
b0069f43 | 1722 | |
03b2a320 | 1723 | if (x86_hyper_type != X86_HYPER_MS_HYPERV) |
0592969e JW |
1724 | return -ENODEV; |
1725 | ||
b0069f43 S |
1726 | init_completion(&probe_event); |
1727 | ||
1728 | /* | |
efc26722 | 1729 | * Get ACPI resources first. |
b0069f43 | 1730 | */ |
0246604c S |
1731 | ret = acpi_bus_register_driver(&vmbus_acpi_driver); |
1732 | ||
b0069f43 S |
1733 | if (ret) |
1734 | return ret; | |
1735 | ||
2dda95f8 S |
1736 | t = wait_for_completion_timeout(&probe_event, 5*HZ); |
1737 | if (t == 0) { | |
1738 | ret = -ETIMEDOUT; | |
1739 | goto cleanup; | |
1740 | } | |
b0069f43 | 1741 | |
efc26722 | 1742 | ret = vmbus_bus_init(); |
91fd799e | 1743 | if (ret) |
2dda95f8 S |
1744 | goto cleanup; |
1745 | ||
2517281d | 1746 | hv_setup_kexec_handler(hv_kexec_handler); |
b4370df2 | 1747 | hv_setup_crash_handler(hv_crash_handler); |
2517281d | 1748 | |
2dda95f8 S |
1749 | return 0; |
1750 | ||
1751 | cleanup: | |
1752 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
cf6a2eac | 1753 | hv_acpi_dev = NULL; |
91fd799e | 1754 | return ret; |
1168ac22 S |
1755 | } |
1756 | ||
93e5bd06 S |
1757 | static void __exit vmbus_exit(void) |
1758 | { | |
e72e7ac5 VK |
1759 | int cpu; |
1760 | ||
2517281d | 1761 | hv_remove_kexec_handler(); |
b4370df2 | 1762 | hv_remove_crash_handler(); |
09a19628 | 1763 | vmbus_connection.conn_state = DISCONNECTED; |
e086748c | 1764 | hv_synic_clockevents_cleanup(); |
2db84eff | 1765 | vmbus_disconnect(); |
76d388cd | 1766 | hv_remove_vmbus_irq(); |
37cdd991 SH |
1767 | for_each_online_cpu(cpu) { |
1768 | struct hv_per_cpu_context *hv_cpu | |
1769 | = per_cpu_ptr(hv_context.cpu_context, cpu); | |
1770 | ||
1771 | tasklet_kill(&hv_cpu->msg_dpc); | |
1772 | } | |
93e5bd06 | 1773 | vmbus_free_channels(); |
37cdd991 | 1774 | |
cc2dd402 | 1775 | if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) { |
510f7aef | 1776 | unregister_die_notifier(&hyperv_die_block); |
096c605f VK |
1777 | atomic_notifier_chain_unregister(&panic_notifier_list, |
1778 | &hyperv_panic_block); | |
1779 | } | |
93e5bd06 | 1780 | bus_unregister(&hv_bus); |
37cdd991 | 1781 | |
76d36ab7 | 1782 | cpuhp_remove_state(hyperv_cpuhp_online); |
06210b42 | 1783 | hv_synic_free(); |
93e5bd06 S |
1784 | acpi_bus_unregister_driver(&vmbus_acpi_driver); |
1785 | } | |
1786 | ||
1168ac22 | 1787 | |
90c9960e | 1788 | MODULE_LICENSE("GPL"); |
3e7ee490 | 1789 | |
43d4e119 | 1790 | subsys_initcall(hv_acpi_init); |
93e5bd06 | 1791 | module_exit(vmbus_exit); |