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Hank Janssen3e7ee492009-07-13 16:02:34 -07001/*
Hank Janssen3e7ee492009-07-13 16:02:34 -07002 * 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>
K. Y. Srinivasanb0069f42011-04-29 13:45:15 -070020 * K. Y. Srinivasan <kys@microsoft.com>
K. Y. Srinivasan52e5c1c2011-03-15 15:03:34 -070021 *
Hank Janssen3e7ee492009-07-13 16:02:34 -070022 */
Hank Janssen0a466182011-03-29 13:58:47 -070023#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
Hank Janssen3e7ee492009-07-13 16:02:34 -070025#include <linux/init.h>
26#include <linux/module.h>
27#include <linux/device.h>
Hank Janssen3e7ee492009-07-13 16:02:34 -070028#include <linux/interrupt.h>
29#include <linux/sysctl.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090030#include <linux/slab.h>
K. Y. Srinivasanb0069f42011-04-29 13:45:15 -070031#include <linux/acpi.h>
Haiyang Zhang8b5d6d32010-05-28 23:22:44 +000032#include <linux/completion.h>
Greg Kroah-Hartman46a97192011-10-04 12:29:52 -070033#include <linux/hyperv.h>
K. Y. Srinivasanb0209502012-12-01 06:46:54 -080034#include <linux/kernel_stat.h>
K. Y. Srinivasan4061ed92015-01-09 23:54:32 -080035#include <linux/clockchips.h>
Vitaly Kuznetsove5132292015-02-27 11:25:51 -080036#include <linux/cpu.h>
Greg Kroah-Hartman407dd162011-10-11 08:36:44 -060037#include <asm/hyperv.h>
Jason Wang1f94ea82012-08-31 13:32:44 +080038#include <asm/hypervisor.h>
K. Y. Srinivasan302a3c02013-02-17 11:30:44 -080039#include <asm/mshyperv.h>
Nick Meier96c1d052015-02-28 11:39:01 -080040#include <linux/notifier.h>
41#include <linux/ptrace.h>
Jake Oshins35464482015-08-05 00:52:37 -070042#include <linux/screen_info.h>
Vitaly Kuznetsov510f7ae2015-08-01 16:08:10 -070043#include <linux/kdebug.h>
Jake Oshins6d146ae2016-04-05 10:22:55 -070044#include <linux/efi.h>
Stephan Mueller4b44f2d2016-05-02 02:14:34 -040045#include <linux/random.h>
K. Y. Srinivasan0f2a6612011-05-12 19:34:28 -070046#include "hyperv_vmbus.h"
Hank Janssen3e7ee492009-07-13 16:02:34 -070047
Stephen Hemmingerfc769362016-12-03 12:34:39 -080048struct vmbus_dynid {
49 struct list_head node;
50 struct hv_vmbus_device_id id;
51};
52
K. Y. Srinivasan607c1a12011-06-06 15:49:39 -070053static struct acpi_device *hv_acpi_dev;
K. Y. Srinivasan1168ac22011-03-15 15:03:32 -070054
K. Y. Srinivasan71a66552011-04-29 13:45:04 -070055static struct completion probe_event;
Hank Janssen3e7ee492009-07-13 16:02:34 -070056
Vitaly Kuznetsov76d36ab2016-12-07 14:53:11 -080057static int hyperv_cpuhp_online;
Nick Meier96c1d052015-02-28 11:39:01 -080058
Vitaly Kuznetsov510f7ae2015-08-01 16:08:10 -070059static void hyperv_report_panic(struct pt_regs *regs)
Nick Meier96c1d052015-02-28 11:39:01 -080060{
Vitaly Kuznetsov510f7ae2015-08-01 16:08:10 -070061 static bool panic_reported;
Nick Meier96c1d052015-02-28 11:39:01 -080062
Vitaly Kuznetsov510f7ae2015-08-01 16:08:10 -070063 /*
64 * We prefer to report panic on 'die' chain as we have proper
65 * registers to report, but if we miss it (e.g. on BUG()) we need
66 * to report it on 'panic'.
67 */
68 if (panic_reported)
69 return;
70 panic_reported = true;
Nick Meier96c1d052015-02-28 11:39:01 -080071
72 wrmsrl(HV_X64_MSR_CRASH_P0, regs->ip);
73 wrmsrl(HV_X64_MSR_CRASH_P1, regs->ax);
74 wrmsrl(HV_X64_MSR_CRASH_P2, regs->bx);
75 wrmsrl(HV_X64_MSR_CRASH_P3, regs->cx);
76 wrmsrl(HV_X64_MSR_CRASH_P4, regs->dx);
77
78 /*
79 * Let Hyper-V know there is crash data available
80 */
81 wrmsrl(HV_X64_MSR_CRASH_CTL, HV_CRASH_CTL_CRASH_NOTIFY);
Vitaly Kuznetsov510f7ae2015-08-01 16:08:10 -070082}
83
84static int hyperv_panic_event(struct notifier_block *nb, unsigned long val,
85 void *args)
86{
87 struct pt_regs *regs;
88
89 regs = current_pt_regs();
90
91 hyperv_report_panic(regs);
Nick Meier96c1d052015-02-28 11:39:01 -080092 return NOTIFY_DONE;
93}
94
Vitaly Kuznetsov510f7ae2015-08-01 16:08:10 -070095static int hyperv_die_event(struct notifier_block *nb, unsigned long val,
96 void *args)
97{
98 struct die_args *die = (struct die_args *)args;
99 struct pt_regs *regs = die->regs;
100
101 hyperv_report_panic(regs);
102 return NOTIFY_DONE;
103}
104
105static struct notifier_block hyperv_die_block = {
106 .notifier_call = hyperv_die_event,
107};
Nick Meier96c1d052015-02-28 11:39:01 -0800108static struct notifier_block hyperv_panic_block = {
109 .notifier_call = hyperv_panic_event,
110};
111
Jake Oshins6d146ae2016-04-05 10:22:55 -0700112static const char *fb_mmio_name = "fb_range";
113static struct resource *fb_mmio;
Stephen Hemmingere2e80842016-09-07 05:39:33 -0700114static struct resource *hyperv_mmio;
115static DEFINE_SEMAPHORE(hyperv_mmio_lock);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700116
K. Y. Srinivasancf6a2ea2011-12-01 09:59:34 -0800117static int vmbus_exists(void)
118{
119 if (hv_acpi_dev == NULL)
120 return -ENODEV;
121
122 return 0;
123}
124
Olaf Heringfd776ba2011-09-02 18:25:56 +0200125#define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2)
126static void print_alias_name(struct hv_device *hv_dev, char *alias_name)
127{
128 int i;
129 for (i = 0; i < VMBUS_ALIAS_LEN; i += 2)
130 sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]);
131}
132
Greg Kroah-Hartman76c52bb2013-09-13 11:32:56 -0700133static u8 channel_monitor_group(struct vmbus_channel *channel)
134{
135 return (u8)channel->offermsg.monitorid / 32;
136}
137
138static u8 channel_monitor_offset(struct vmbus_channel *channel)
139{
140 return (u8)channel->offermsg.monitorid % 32;
141}
142
143static u32 channel_pending(struct vmbus_channel *channel,
144 struct hv_monitor_page *monitor_page)
145{
146 u8 monitor_group = channel_monitor_group(channel);
147 return monitor_page->trigger_group[monitor_group].pending;
148}
149
Greg Kroah-Hartman1cee2722013-09-13 11:32:57 -0700150static u32 channel_latency(struct vmbus_channel *channel,
151 struct hv_monitor_page *monitor_page)
152{
153 u8 monitor_group = channel_monitor_group(channel);
154 u8 monitor_offset = channel_monitor_offset(channel);
155 return monitor_page->latency[monitor_group][monitor_offset];
156}
157
Greg Kroah-Hartman4947c742013-09-13 11:32:58 -0700158static u32 channel_conn_id(struct vmbus_channel *channel,
159 struct hv_monitor_page *monitor_page)
160{
161 u8 monitor_group = channel_monitor_group(channel);
162 u8 monitor_offset = channel_monitor_offset(channel);
163 return monitor_page->parameter[monitor_group][monitor_offset].connectionid.u.id;
164}
165
Greg Kroah-Hartman03f3a912013-09-13 11:32:49 -0700166static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr,
167 char *buf)
168{
169 struct hv_device *hv_dev = device_to_hv_device(dev);
170
171 if (!hv_dev->channel)
172 return -ENODEV;
173 return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid);
174}
175static DEVICE_ATTR_RO(id);
176
Greg Kroah-Hartmana8fb5f32013-09-13 11:32:50 -0700177static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr,
178 char *buf)
179{
180 struct hv_device *hv_dev = device_to_hv_device(dev);
181
182 if (!hv_dev->channel)
183 return -ENODEV;
184 return sprintf(buf, "%d\n", hv_dev->channel->state);
185}
186static DEVICE_ATTR_RO(state);
187
Greg Kroah-Hartman5ffd00e2013-09-13 11:32:51 -0700188static ssize_t monitor_id_show(struct device *dev,
189 struct device_attribute *dev_attr, char *buf)
190{
191 struct hv_device *hv_dev = device_to_hv_device(dev);
192
193 if (!hv_dev->channel)
194 return -ENODEV;
195 return sprintf(buf, "%d\n", hv_dev->channel->offermsg.monitorid);
196}
197static DEVICE_ATTR_RO(monitor_id);
198
Greg Kroah-Hartman68234c02013-09-13 11:32:53 -0700199static ssize_t class_id_show(struct device *dev,
200 struct device_attribute *dev_attr, char *buf)
201{
202 struct hv_device *hv_dev = device_to_hv_device(dev);
203
204 if (!hv_dev->channel)
205 return -ENODEV;
206 return sprintf(buf, "{%pUl}\n",
207 hv_dev->channel->offermsg.offer.if_type.b);
208}
209static DEVICE_ATTR_RO(class_id);
210
Greg Kroah-Hartman7c55e1d2013-09-13 11:32:54 -0700211static ssize_t device_id_show(struct device *dev,
212 struct device_attribute *dev_attr, char *buf)
213{
214 struct hv_device *hv_dev = device_to_hv_device(dev);
215
216 if (!hv_dev->channel)
217 return -ENODEV;
218 return sprintf(buf, "{%pUl}\n",
219 hv_dev->channel->offermsg.offer.if_instance.b);
220}
221static DEVICE_ATTR_RO(device_id);
222
Greg Kroah-Hartman647fa372013-09-13 11:32:52 -0700223static ssize_t modalias_show(struct device *dev,
224 struct device_attribute *dev_attr, char *buf)
225{
226 struct hv_device *hv_dev = device_to_hv_device(dev);
227 char alias_name[VMBUS_ALIAS_LEN + 1];
228
229 print_alias_name(hv_dev, alias_name);
230 return sprintf(buf, "vmbus:%s\n", alias_name);
231}
232static DEVICE_ATTR_RO(modalias);
233
Greg Kroah-Hartman76c52bb2013-09-13 11:32:56 -0700234static ssize_t server_monitor_pending_show(struct device *dev,
235 struct device_attribute *dev_attr,
236 char *buf)
237{
238 struct hv_device *hv_dev = device_to_hv_device(dev);
239
240 if (!hv_dev->channel)
241 return -ENODEV;
242 return sprintf(buf, "%d\n",
243 channel_pending(hv_dev->channel,
244 vmbus_connection.monitor_pages[1]));
245}
246static DEVICE_ATTR_RO(server_monitor_pending);
247
248static ssize_t client_monitor_pending_show(struct device *dev,
249 struct device_attribute *dev_attr,
250 char *buf)
251{
252 struct hv_device *hv_dev = device_to_hv_device(dev);
253
254 if (!hv_dev->channel)
255 return -ENODEV;
256 return sprintf(buf, "%d\n",
257 channel_pending(hv_dev->channel,
258 vmbus_connection.monitor_pages[1]));
259}
260static DEVICE_ATTR_RO(client_monitor_pending);
Greg Kroah-Hartman68234c02013-09-13 11:32:53 -0700261
Greg Kroah-Hartman1cee2722013-09-13 11:32:57 -0700262static ssize_t server_monitor_latency_show(struct device *dev,
263 struct device_attribute *dev_attr,
264 char *buf)
265{
266 struct hv_device *hv_dev = device_to_hv_device(dev);
267
268 if (!hv_dev->channel)
269 return -ENODEV;
270 return sprintf(buf, "%d\n",
271 channel_latency(hv_dev->channel,
272 vmbus_connection.monitor_pages[0]));
273}
274static DEVICE_ATTR_RO(server_monitor_latency);
275
276static ssize_t client_monitor_latency_show(struct device *dev,
277 struct device_attribute *dev_attr,
278 char *buf)
279{
280 struct hv_device *hv_dev = device_to_hv_device(dev);
281
282 if (!hv_dev->channel)
283 return -ENODEV;
284 return sprintf(buf, "%d\n",
285 channel_latency(hv_dev->channel,
286 vmbus_connection.monitor_pages[1]));
287}
288static DEVICE_ATTR_RO(client_monitor_latency);
289
Greg Kroah-Hartman4947c742013-09-13 11:32:58 -0700290static ssize_t server_monitor_conn_id_show(struct device *dev,
291 struct device_attribute *dev_attr,
292 char *buf)
293{
294 struct hv_device *hv_dev = device_to_hv_device(dev);
295
296 if (!hv_dev->channel)
297 return -ENODEV;
298 return sprintf(buf, "%d\n",
299 channel_conn_id(hv_dev->channel,
300 vmbus_connection.monitor_pages[0]));
301}
302static DEVICE_ATTR_RO(server_monitor_conn_id);
303
304static ssize_t client_monitor_conn_id_show(struct device *dev,
305 struct device_attribute *dev_attr,
306 char *buf)
307{
308 struct hv_device *hv_dev = device_to_hv_device(dev);
309
310 if (!hv_dev->channel)
311 return -ENODEV;
312 return sprintf(buf, "%d\n",
313 channel_conn_id(hv_dev->channel,
314 vmbus_connection.monitor_pages[1]));
315}
316static DEVICE_ATTR_RO(client_monitor_conn_id);
317
Greg Kroah-Hartman98f4c652013-09-13 11:33:01 -0700318static ssize_t out_intr_mask_show(struct device *dev,
319 struct device_attribute *dev_attr, char *buf)
320{
321 struct hv_device *hv_dev = device_to_hv_device(dev);
322 struct hv_ring_buffer_debug_info outbound;
323
324 if (!hv_dev->channel)
325 return -ENODEV;
326 hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);
327 return sprintf(buf, "%d\n", outbound.current_interrupt_mask);
328}
329static DEVICE_ATTR_RO(out_intr_mask);
330
331static ssize_t out_read_index_show(struct device *dev,
332 struct device_attribute *dev_attr, char *buf)
333{
334 struct hv_device *hv_dev = device_to_hv_device(dev);
335 struct hv_ring_buffer_debug_info outbound;
336
337 if (!hv_dev->channel)
338 return -ENODEV;
339 hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);
340 return sprintf(buf, "%d\n", outbound.current_read_index);
341}
342static DEVICE_ATTR_RO(out_read_index);
343
344static ssize_t out_write_index_show(struct device *dev,
345 struct device_attribute *dev_attr,
346 char *buf)
347{
348 struct hv_device *hv_dev = device_to_hv_device(dev);
349 struct hv_ring_buffer_debug_info outbound;
350
351 if (!hv_dev->channel)
352 return -ENODEV;
353 hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);
354 return sprintf(buf, "%d\n", outbound.current_write_index);
355}
356static DEVICE_ATTR_RO(out_write_index);
357
358static ssize_t out_read_bytes_avail_show(struct device *dev,
359 struct device_attribute *dev_attr,
360 char *buf)
361{
362 struct hv_device *hv_dev = device_to_hv_device(dev);
363 struct hv_ring_buffer_debug_info outbound;
364
365 if (!hv_dev->channel)
366 return -ENODEV;
367 hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);
368 return sprintf(buf, "%d\n", outbound.bytes_avail_toread);
369}
370static DEVICE_ATTR_RO(out_read_bytes_avail);
371
372static ssize_t out_write_bytes_avail_show(struct device *dev,
373 struct device_attribute *dev_attr,
374 char *buf)
375{
376 struct hv_device *hv_dev = device_to_hv_device(dev);
377 struct hv_ring_buffer_debug_info outbound;
378
379 if (!hv_dev->channel)
380 return -ENODEV;
381 hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);
382 return sprintf(buf, "%d\n", outbound.bytes_avail_towrite);
383}
384static DEVICE_ATTR_RO(out_write_bytes_avail);
385
386static ssize_t in_intr_mask_show(struct device *dev,
387 struct device_attribute *dev_attr, char *buf)
388{
389 struct hv_device *hv_dev = device_to_hv_device(dev);
390 struct hv_ring_buffer_debug_info inbound;
391
392 if (!hv_dev->channel)
393 return -ENODEV;
394 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
395 return sprintf(buf, "%d\n", inbound.current_interrupt_mask);
396}
397static DEVICE_ATTR_RO(in_intr_mask);
398
399static ssize_t in_read_index_show(struct device *dev,
400 struct device_attribute *dev_attr, char *buf)
401{
402 struct hv_device *hv_dev = device_to_hv_device(dev);
403 struct hv_ring_buffer_debug_info inbound;
404
405 if (!hv_dev->channel)
406 return -ENODEV;
407 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
408 return sprintf(buf, "%d\n", inbound.current_read_index);
409}
410static DEVICE_ATTR_RO(in_read_index);
411
412static ssize_t in_write_index_show(struct device *dev,
413 struct device_attribute *dev_attr, char *buf)
414{
415 struct hv_device *hv_dev = device_to_hv_device(dev);
416 struct hv_ring_buffer_debug_info inbound;
417
418 if (!hv_dev->channel)
419 return -ENODEV;
420 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
421 return sprintf(buf, "%d\n", inbound.current_write_index);
422}
423static DEVICE_ATTR_RO(in_write_index);
424
425static ssize_t in_read_bytes_avail_show(struct device *dev,
426 struct device_attribute *dev_attr,
427 char *buf)
428{
429 struct hv_device *hv_dev = device_to_hv_device(dev);
430 struct hv_ring_buffer_debug_info inbound;
431
432 if (!hv_dev->channel)
433 return -ENODEV;
434 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
435 return sprintf(buf, "%d\n", inbound.bytes_avail_toread);
436}
437static DEVICE_ATTR_RO(in_read_bytes_avail);
438
439static ssize_t in_write_bytes_avail_show(struct device *dev,
440 struct device_attribute *dev_attr,
441 char *buf)
442{
443 struct hv_device *hv_dev = device_to_hv_device(dev);
444 struct hv_ring_buffer_debug_info inbound;
445
446 if (!hv_dev->channel)
447 return -ENODEV;
448 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
449 return sprintf(buf, "%d\n", inbound.bytes_avail_towrite);
450}
451static DEVICE_ATTR_RO(in_write_bytes_avail);
452
Dexuan Cui042ab032015-08-05 00:52:43 -0700453static ssize_t channel_vp_mapping_show(struct device *dev,
454 struct device_attribute *dev_attr,
455 char *buf)
456{
457 struct hv_device *hv_dev = device_to_hv_device(dev);
458 struct vmbus_channel *channel = hv_dev->channel, *cur_sc;
459 unsigned long flags;
460 int buf_size = PAGE_SIZE, n_written, tot_written;
461 struct list_head *cur;
462
463 if (!channel)
464 return -ENODEV;
465
466 tot_written = snprintf(buf, buf_size, "%u:%u\n",
467 channel->offermsg.child_relid, channel->target_cpu);
468
469 spin_lock_irqsave(&channel->lock, flags);
470
471 list_for_each(cur, &channel->sc_list) {
472 if (tot_written >= buf_size - 1)
473 break;
474
475 cur_sc = list_entry(cur, struct vmbus_channel, sc_list);
476 n_written = scnprintf(buf + tot_written,
477 buf_size - tot_written,
478 "%u:%u\n",
479 cur_sc->offermsg.child_relid,
480 cur_sc->target_cpu);
481 tot_written += n_written;
482 }
483
484 spin_unlock_irqrestore(&channel->lock, flags);
485
486 return tot_written;
487}
488static DEVICE_ATTR_RO(channel_vp_mapping);
489
K. Y. Srinivasan7047f172015-12-25 20:00:30 -0800490static ssize_t vendor_show(struct device *dev,
491 struct device_attribute *dev_attr,
492 char *buf)
493{
494 struct hv_device *hv_dev = device_to_hv_device(dev);
495 return sprintf(buf, "0x%x\n", hv_dev->vendor_id);
496}
497static DEVICE_ATTR_RO(vendor);
498
499static ssize_t device_show(struct device *dev,
500 struct device_attribute *dev_attr,
501 char *buf)
502{
503 struct hv_device *hv_dev = device_to_hv_device(dev);
504 return sprintf(buf, "0x%x\n", hv_dev->device_id);
505}
506static DEVICE_ATTR_RO(device);
507
Greg Kroah-Hartman98f4c652013-09-13 11:33:01 -0700508/* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */
Stephen Hemmingerfc769362016-12-03 12:34:39 -0800509static struct attribute *vmbus_dev_attrs[] = {
Greg Kroah-Hartman03f3a912013-09-13 11:32:49 -0700510 &dev_attr_id.attr,
Greg Kroah-Hartmana8fb5f32013-09-13 11:32:50 -0700511 &dev_attr_state.attr,
Greg Kroah-Hartman5ffd00e2013-09-13 11:32:51 -0700512 &dev_attr_monitor_id.attr,
Greg Kroah-Hartman68234c02013-09-13 11:32:53 -0700513 &dev_attr_class_id.attr,
Greg Kroah-Hartman7c55e1d2013-09-13 11:32:54 -0700514 &dev_attr_device_id.attr,
Greg Kroah-Hartman647fa372013-09-13 11:32:52 -0700515 &dev_attr_modalias.attr,
Greg Kroah-Hartman76c52bb2013-09-13 11:32:56 -0700516 &dev_attr_server_monitor_pending.attr,
517 &dev_attr_client_monitor_pending.attr,
Greg Kroah-Hartman1cee2722013-09-13 11:32:57 -0700518 &dev_attr_server_monitor_latency.attr,
519 &dev_attr_client_monitor_latency.attr,
Greg Kroah-Hartman4947c742013-09-13 11:32:58 -0700520 &dev_attr_server_monitor_conn_id.attr,
521 &dev_attr_client_monitor_conn_id.attr,
Greg Kroah-Hartman98f4c652013-09-13 11:33:01 -0700522 &dev_attr_out_intr_mask.attr,
523 &dev_attr_out_read_index.attr,
524 &dev_attr_out_write_index.attr,
525 &dev_attr_out_read_bytes_avail.attr,
526 &dev_attr_out_write_bytes_avail.attr,
527 &dev_attr_in_intr_mask.attr,
528 &dev_attr_in_read_index.attr,
529 &dev_attr_in_write_index.attr,
530 &dev_attr_in_read_bytes_avail.attr,
531 &dev_attr_in_write_bytes_avail.attr,
Dexuan Cui042ab032015-08-05 00:52:43 -0700532 &dev_attr_channel_vp_mapping.attr,
K. Y. Srinivasan7047f172015-12-25 20:00:30 -0800533 &dev_attr_vendor.attr,
534 &dev_attr_device.attr,
Greg Kroah-Hartman03f3a912013-09-13 11:32:49 -0700535 NULL,
536};
Stephen Hemmingerfc769362016-12-03 12:34:39 -0800537ATTRIBUTE_GROUPS(vmbus_dev);
Greg Kroah-Hartman03f3a912013-09-13 11:32:49 -0700538
K. Y. Srinivasanadde2482011-03-15 15:03:37 -0700539/*
540 * vmbus_uevent - add uevent for our device
541 *
542 * This routine is invoked when a device is added or removed on the vmbus to
543 * generate a uevent to udev in the userspace. The udev will then look at its
544 * rule and the uevent generated here to load the appropriate driver
K. Y. Srinivasan0ddda662011-08-25 09:48:38 -0700545 *
546 * The alias string will be of the form vmbus:guid where guid is the string
547 * representation of the device guid (each byte of the guid will be
548 * represented with two hex characters.
K. Y. Srinivasanadde2482011-03-15 15:03:37 -0700549 */
550static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env)
551{
552 struct hv_device *dev = device_to_hv_device(device);
Olaf Heringfd776ba2011-09-02 18:25:56 +0200553 int ret;
554 char alias_name[VMBUS_ALIAS_LEN + 1];
K. Y. Srinivasanadde2482011-03-15 15:03:37 -0700555
Olaf Heringfd776ba2011-09-02 18:25:56 +0200556 print_alias_name(dev, alias_name);
K. Y. Srinivasan0ddda662011-08-25 09:48:38 -0700557 ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name);
558 return ret;
K. Y. Srinivasanadde2482011-03-15 15:03:37 -0700559}
560
stephen hemminger1b9d48f2014-06-03 08:38:15 -0700561static const uuid_le null_guid;
K. Y. Srinivasan5841a822011-08-25 09:48:39 -0700562
K. Y. Srinivasanaf3ff642015-12-14 16:01:43 -0800563static inline bool is_null_guid(const uuid_le *guid)
K. Y. Srinivasan5841a822011-08-25 09:48:39 -0700564{
K. Y. Srinivasan4ae92502015-12-14 16:01:44 -0800565 if (uuid_le_cmp(*guid, null_guid))
K. Y. Srinivasan5841a822011-08-25 09:48:39 -0700566 return false;
567 return true;
568}
569
K. Y. Srinivasan3037a7b2011-09-13 10:59:37 -0700570/*
571 * Return a matching hv_vmbus_device_id pointer.
572 * If there is no match, return NULL.
573 */
Stephen Hemmingerfc769362016-12-03 12:34:39 -0800574static const struct hv_vmbus_device_id *hv_vmbus_get_id(struct hv_driver *drv,
K. Y. Srinivasanaf3ff642015-12-14 16:01:43 -0800575 const uuid_le *guid)
K. Y. Srinivasan3037a7b2011-09-13 10:59:37 -0700576{
Stephen Hemmingerfc769362016-12-03 12:34:39 -0800577 const struct hv_vmbus_device_id *id = NULL;
578 struct vmbus_dynid *dynid;
579
580 /* Look at the dynamic ids first, before the static ones */
581 spin_lock(&drv->dynids.lock);
582 list_for_each_entry(dynid, &drv->dynids.list, node) {
583 if (!uuid_le_cmp(dynid->id.guid, *guid)) {
584 id = &dynid->id;
585 break;
586 }
587 }
588 spin_unlock(&drv->dynids.lock);
589
590 if (id)
591 return id;
592
593 id = drv->id_table;
594 if (id == NULL)
595 return NULL; /* empty device table */
596
K. Y. Srinivasanaf3ff642015-12-14 16:01:43 -0800597 for (; !is_null_guid(&id->guid); id++)
K. Y. Srinivasan4ae92502015-12-14 16:01:44 -0800598 if (!uuid_le_cmp(id->guid, *guid))
K. Y. Srinivasan3037a7b2011-09-13 10:59:37 -0700599 return id;
600
601 return NULL;
602}
603
Stephen Hemmingerfc769362016-12-03 12:34:39 -0800604/* vmbus_add_dynid - add a new device ID to this driver and re-probe devices */
605static int vmbus_add_dynid(struct hv_driver *drv, uuid_le *guid)
606{
607 struct vmbus_dynid *dynid;
608
609 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
610 if (!dynid)
611 return -ENOMEM;
612
613 dynid->id.guid = *guid;
614
615 spin_lock(&drv->dynids.lock);
616 list_add_tail(&dynid->node, &drv->dynids.list);
617 spin_unlock(&drv->dynids.lock);
618
619 return driver_attach(&drv->driver);
620}
621
622static void vmbus_free_dynids(struct hv_driver *drv)
623{
624 struct vmbus_dynid *dynid, *n;
625
626 spin_lock(&drv->dynids.lock);
627 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
628 list_del(&dynid->node);
629 kfree(dynid);
630 }
631 spin_unlock(&drv->dynids.lock);
632}
633
634/* Parse string of form: 1b4e28ba-2fa1-11d2-883f-b9a761bde3f */
635static int get_uuid_le(const char *str, uuid_le *uu)
636{
637 unsigned int b[16];
638 int i;
639
640 if (strlen(str) < 37)
641 return -1;
642
643 for (i = 0; i < 36; i++) {
644 switch (i) {
645 case 8: case 13: case 18: case 23:
646 if (str[i] != '-')
647 return -1;
648 break;
649 default:
650 if (!isxdigit(str[i]))
651 return -1;
652 }
653 }
654
655 /* unparse little endian output byte order */
656 if (sscanf(str,
657 "%2x%2x%2x%2x-%2x%2x-%2x%2x-%2x%2x-%2x%2x%2x%2x%2x%2x",
658 &b[3], &b[2], &b[1], &b[0],
659 &b[5], &b[4], &b[7], &b[6], &b[8], &b[9],
660 &b[10], &b[11], &b[12], &b[13], &b[14], &b[15]) != 16)
661 return -1;
662
663 for (i = 0; i < 16; i++)
664 uu->b[i] = b[i];
665 return 0;
666}
667
668/*
669 * store_new_id - sysfs frontend to vmbus_add_dynid()
670 *
671 * Allow GUIDs to be added to an existing driver via sysfs.
672 */
673static ssize_t new_id_store(struct device_driver *driver, const char *buf,
674 size_t count)
675{
676 struct hv_driver *drv = drv_to_hv_drv(driver);
677 uuid_le guid = NULL_UUID_LE;
678 ssize_t retval;
679
680 if (get_uuid_le(buf, &guid) != 0)
681 return -EINVAL;
682
683 if (hv_vmbus_get_id(drv, &guid))
684 return -EEXIST;
685
686 retval = vmbus_add_dynid(drv, &guid);
687 if (retval)
688 return retval;
689 return count;
690}
691static DRIVER_ATTR_WO(new_id);
692
693/*
694 * store_remove_id - remove a PCI device ID from this driver
695 *
696 * Removes a dynamic pci device ID to this driver.
697 */
698static ssize_t remove_id_store(struct device_driver *driver, const char *buf,
699 size_t count)
700{
701 struct hv_driver *drv = drv_to_hv_drv(driver);
702 struct vmbus_dynid *dynid, *n;
703 uuid_le guid = NULL_UUID_LE;
704 size_t retval = -ENODEV;
705
706 if (get_uuid_le(buf, &guid))
707 return -EINVAL;
708
709 spin_lock(&drv->dynids.lock);
710 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
711 struct hv_vmbus_device_id *id = &dynid->id;
712
713 if (!uuid_le_cmp(id->guid, guid)) {
714 list_del(&dynid->node);
715 kfree(dynid);
716 retval = count;
717 break;
718 }
719 }
720 spin_unlock(&drv->dynids.lock);
721
722 return retval;
723}
724static DRIVER_ATTR_WO(remove_id);
725
726static struct attribute *vmbus_drv_attrs[] = {
727 &driver_attr_new_id.attr,
728 &driver_attr_remove_id.attr,
729 NULL,
730};
731ATTRIBUTE_GROUPS(vmbus_drv);
K. Y. Srinivasan3037a7b2011-09-13 10:59:37 -0700732
K. Y. Srinivasanb7fc1472011-03-15 15:03:38 -0700733
734/*
735 * vmbus_match - Attempt to match the specified device to the specified driver
736 */
737static int vmbus_match(struct device *device, struct device_driver *driver)
738{
K. Y. Srinivasanb7fc1472011-03-15 15:03:38 -0700739 struct hv_driver *drv = drv_to_hv_drv(driver);
K. Y. Srinivasane8e27042011-06-06 15:50:04 -0700740 struct hv_device *hv_dev = device_to_hv_device(device);
K. Y. Srinivasanb7fc1472011-03-15 15:03:38 -0700741
Dexuan Cui8981da32016-01-27 22:29:41 -0800742 /* The hv_sock driver handles all hv_sock offers. */
743 if (is_hvsock_channel(hv_dev->channel))
744 return drv->hvsock;
745
Stephen Hemmingerfc769362016-12-03 12:34:39 -0800746 if (hv_vmbus_get_id(drv, &hv_dev->dev_type))
K. Y. Srinivasan3037a7b2011-09-13 10:59:37 -0700747 return 1;
K. Y. Srinivasande632a22011-04-26 09:20:24 -0700748
K. Y. Srinivasan5841a822011-08-25 09:48:39 -0700749 return 0;
K. Y. Srinivasanb7fc1472011-03-15 15:03:38 -0700750}
751
K. Y. Srinivasanf1f0d672011-03-15 15:03:39 -0700752/*
753 * vmbus_probe - Add the new vmbus's child device
754 */
755static int vmbus_probe(struct device *child_device)
756{
757 int ret = 0;
758 struct hv_driver *drv =
759 drv_to_hv_drv(child_device->driver);
K. Y. Srinivasan9efd21e2011-04-29 13:45:10 -0700760 struct hv_device *dev = device_to_hv_device(child_device);
K. Y. Srinivasan84946892011-09-13 10:59:38 -0700761 const struct hv_vmbus_device_id *dev_id;
K. Y. Srinivasanf1f0d672011-03-15 15:03:39 -0700762
Stephen Hemmingerfc769362016-12-03 12:34:39 -0800763 dev_id = hv_vmbus_get_id(drv, &dev->dev_type);
K. Y. Srinivasan9efd21e2011-04-29 13:45:10 -0700764 if (drv->probe) {
K. Y. Srinivasan84946892011-09-13 10:59:38 -0700765 ret = drv->probe(dev, dev_id);
K. Y. Srinivasanb14a7b32011-04-29 13:45:03 -0700766 if (ret != 0)
Hank Janssen0a466182011-03-29 13:58:47 -0700767 pr_err("probe failed for device %s (%d)\n",
768 dev_name(child_device), ret);
K. Y. Srinivasanf1f0d672011-03-15 15:03:39 -0700769
K. Y. Srinivasanf1f0d672011-03-15 15:03:39 -0700770 } else {
Hank Janssen0a466182011-03-29 13:58:47 -0700771 pr_err("probe not set for driver %s\n",
772 dev_name(child_device));
K. Y. Srinivasan6de925b2011-06-06 15:50:07 -0700773 ret = -ENODEV;
K. Y. Srinivasanf1f0d672011-03-15 15:03:39 -0700774 }
775 return ret;
776}
777
K. Y. Srinivasanc5dce3d2011-03-15 15:03:40 -0700778/*
779 * vmbus_remove - Remove a vmbus device
780 */
781static int vmbus_remove(struct device *child_device)
782{
K. Y. Srinivasand15a0302015-02-28 11:18:16 -0800783 struct hv_driver *drv;
K. Y. Srinivasan415b0232011-04-29 13:45:12 -0700784 struct hv_device *dev = device_to_hv_device(child_device);
K. Y. Srinivasanc5dce3d2011-03-15 15:03:40 -0700785
K. Y. Srinivasand15a0302015-02-28 11:18:16 -0800786 if (child_device->driver) {
787 drv = drv_to_hv_drv(child_device->driver);
788 if (drv->remove)
789 drv->remove(dev);
K. Y. Srinivasand15a0302015-02-28 11:18:16 -0800790 }
K. Y. Srinivasanc5dce3d2011-03-15 15:03:40 -0700791
792 return 0;
793}
794
K. Y. Srinivasaneb1bb252011-03-15 15:03:41 -0700795
796/*
797 * vmbus_shutdown - Shutdown a vmbus device
798 */
799static void vmbus_shutdown(struct device *child_device)
800{
801 struct hv_driver *drv;
K. Y. Srinivasanca6887f2011-04-29 13:45:14 -0700802 struct hv_device *dev = device_to_hv_device(child_device);
K. Y. Srinivasaneb1bb252011-03-15 15:03:41 -0700803
804
805 /* The device may not be attached yet */
806 if (!child_device->driver)
807 return;
808
809 drv = drv_to_hv_drv(child_device->driver);
810
K. Y. Srinivasanca6887f2011-04-29 13:45:14 -0700811 if (drv->shutdown)
812 drv->shutdown(dev);
K. Y. Srinivasaneb1bb252011-03-15 15:03:41 -0700813
814 return;
815}
816
K. Y. Srinivasan086e7a52011-03-15 15:03:42 -0700817
818/*
819 * vmbus_device_release - Final callback release of the vmbus child device
820 */
821static void vmbus_device_release(struct device *device)
822{
K. Y. Srinivasane8e27042011-06-06 15:50:04 -0700823 struct hv_device *hv_dev = device_to_hv_device(device);
Dexuan Cui34c68012015-12-14 16:01:49 -0800824 struct vmbus_channel *channel = hv_dev->channel;
K. Y. Srinivasan086e7a52011-03-15 15:03:42 -0700825
Dexuan Cui34c68012015-12-14 16:01:49 -0800826 hv_process_channel_removal(channel,
827 channel->offermsg.child_relid);
K. Y. Srinivasane8e27042011-06-06 15:50:04 -0700828 kfree(hv_dev);
K. Y. Srinivasan086e7a52011-03-15 15:03:42 -0700829
830}
831
Bill Pemberton454f18a2009-07-27 16:47:24 -0400832/* The one and only one */
K. Y. Srinivasan9adcac52011-04-29 13:45:08 -0700833static struct bus_type hv_bus = {
834 .name = "vmbus",
835 .match = vmbus_match,
836 .shutdown = vmbus_shutdown,
837 .remove = vmbus_remove,
838 .probe = vmbus_probe,
839 .uevent = vmbus_uevent,
Stephen Hemmingerfc769362016-12-03 12:34:39 -0800840 .dev_groups = vmbus_dev_groups,
841 .drv_groups = vmbus_drv_groups,
Hank Janssen3e7ee492009-07-13 16:02:34 -0700842};
843
Timo Teräsbf6506f2010-12-15 20:48:08 +0200844struct onmessage_work_context {
845 struct work_struct work;
846 struct hv_message msg;
847};
848
849static void vmbus_onmessage_work(struct work_struct *work)
850{
851 struct onmessage_work_context *ctx;
852
Vitaly Kuznetsov09a19622015-02-27 11:25:54 -0800853 /* Do not process messages if we're in DISCONNECTED state */
854 if (vmbus_connection.conn_state == DISCONNECTED)
855 return;
856
Timo Teräsbf6506f2010-12-15 20:48:08 +0200857 ctx = container_of(work, struct onmessage_work_context,
858 work);
859 vmbus_onmessage(&ctx->msg);
860 kfree(ctx);
861}
862
kbuild test robotd8a60e02015-01-26 01:17:54 +0800863static void hv_process_timer_expiration(struct hv_message *msg, int cpu)
K. Y. Srinivasan4061ed92015-01-09 23:54:32 -0800864{
865 struct clock_event_device *dev = hv_context.clk_evt[cpu];
866
867 if (dev->event_handler)
868 dev->event_handler(dev);
869
Vitaly Kuznetsovcd95aad2016-04-30 19:21:34 -0700870 vmbus_signal_eom(msg, HVMSG_TIMER_EXPIRED);
K. Y. Srinivasan4061ed92015-01-09 23:54:32 -0800871}
872
K. Y. Srinivasand81274a2016-02-26 15:13:21 -0800873void vmbus_on_msg_dpc(unsigned long data)
Greg Kroah-Hartman36199a92010-12-02 11:59:22 -0800874{
875 int cpu = smp_processor_id();
876 void *page_addr = hv_context.synic_message_page[cpu];
877 struct hv_message *msg = (struct hv_message *)page_addr +
878 VMBUS_MESSAGE_SINT;
Dexuan Cui652594c2015-03-27 09:10:08 -0700879 struct vmbus_channel_message_header *hdr;
880 struct vmbus_channel_message_table_entry *entry;
Timo Teräsbf6506f2010-12-15 20:48:08 +0200881 struct onmessage_work_context *ctx;
Vitaly Kuznetsovcd95aad2016-04-30 19:21:34 -0700882 u32 message_type = msg->header.message_type;
Greg Kroah-Hartman36199a92010-12-02 11:59:22 -0800883
Vitaly Kuznetsovcd95aad2016-04-30 19:21:34 -0700884 if (message_type == HVMSG_NONE)
Vitaly Kuznetsov7be3e162016-02-26 15:13:15 -0800885 /* no msg */
886 return;
Dexuan Cui652594c2015-03-27 09:10:08 -0700887
Vitaly Kuznetsov7be3e162016-02-26 15:13:15 -0800888 hdr = (struct vmbus_channel_message_header *)msg->u.payload;
Dexuan Cui652594c2015-03-27 09:10:08 -0700889
Vitaly Kuznetsov7be3e162016-02-26 15:13:15 -0800890 if (hdr->msgtype >= CHANNELMSG_COUNT) {
891 WARN_ONCE(1, "unknown msgtype=%d\n", hdr->msgtype);
892 goto msg_handled;
893 }
Dexuan Cui652594c2015-03-27 09:10:08 -0700894
Vitaly Kuznetsov7be3e162016-02-26 15:13:15 -0800895 entry = &channel_message_table[hdr->msgtype];
896 if (entry->handler_type == VMHT_BLOCKING) {
897 ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC);
898 if (ctx == NULL)
899 return;
Dexuan Cui652594c2015-03-27 09:10:08 -0700900
Vitaly Kuznetsov7be3e162016-02-26 15:13:15 -0800901 INIT_WORK(&ctx->work, vmbus_onmessage_work);
902 memcpy(&ctx->msg, msg, sizeof(*msg));
Greg Kroah-Hartman36199a92010-12-02 11:59:22 -0800903
Vitaly Kuznetsov7be3e162016-02-26 15:13:15 -0800904 queue_work(vmbus_connection.work_queue, &ctx->work);
905 } else
906 entry->message_handler(hdr);
Dexuan Cui652594c2015-03-27 09:10:08 -0700907
908msg_handled:
Vitaly Kuznetsovcd95aad2016-04-30 19:21:34 -0700909 vmbus_signal_eom(msg, message_type);
Greg Kroah-Hartman36199a92010-12-02 11:59:22 -0800910}
911
Thomas Gleixner76d388c2014-03-05 13:42:14 +0100912static void vmbus_isr(void)
Greg Kroah-Hartman36199a92010-12-02 11:59:22 -0800913{
Greg Kroah-Hartman36199a92010-12-02 11:59:22 -0800914 int cpu = smp_processor_id();
915 void *page_addr;
916 struct hv_message *msg;
917 union hv_synic_event_flags *event;
K. Y. Srinivasanae4636e2011-08-27 11:31:35 -0700918 bool handled = false;
Greg Kroah-Hartman36199a92010-12-02 11:59:22 -0800919
K. Y. Srinivasan5ab05952012-12-01 06:46:55 -0800920 page_addr = hv_context.synic_event_page[cpu];
921 if (page_addr == NULL)
Thomas Gleixner76d388c2014-03-05 13:42:14 +0100922 return;
K. Y. Srinivasan5ab05952012-12-01 06:46:55 -0800923
924 event = (union hv_synic_event_flags *)page_addr +
925 VMBUS_MESSAGE_SINT;
K. Y. Srinivasan7341d902011-08-31 14:35:56 -0700926 /*
927 * Check for events before checking for messages. This is the order
928 * in which events and messages are checked in Windows guests on
929 * Hyper-V, and the Windows team suggested we do the same.
930 */
Greg Kroah-Hartman36199a92010-12-02 11:59:22 -0800931
K. Y. Srinivasan6552ecd2012-12-01 06:46:49 -0800932 if ((vmbus_proto_version == VERSION_WS2008) ||
933 (vmbus_proto_version == VERSION_WIN7)) {
Greg Kroah-Hartman36199a92010-12-02 11:59:22 -0800934
K. Y. Srinivasan6552ecd2012-12-01 06:46:49 -0800935 /* Since we are a child, we only need to check bit 0 */
936 if (sync_test_and_clear_bit(0,
937 (unsigned long *) &event->flags32[0])) {
938 handled = true;
939 }
940 } else {
941 /*
942 * Our host is win8 or above. The signaling mechanism
943 * has changed and we can directly look at the event page.
944 * If bit n is set then we have an interrup on the channel
945 * whose id is n.
946 */
K. Y. Srinivasanae4636e2011-08-27 11:31:35 -0700947 handled = true;
K. Y. Srinivasan793be9c2011-03-15 15:03:43 -0700948 }
K. Y. Srinivasanae4636e2011-08-27 11:31:35 -0700949
K. Y. Srinivasan6552ecd2012-12-01 06:46:49 -0800950 if (handled)
K. Y. Srinivasandb11f122012-12-01 06:46:53 -0800951 tasklet_schedule(hv_context.event_dpc[cpu]);
K. Y. Srinivasan6552ecd2012-12-01 06:46:49 -0800952
953
K. Y. Srinivasan7341d902011-08-31 14:35:56 -0700954 page_addr = hv_context.synic_message_page[cpu];
955 msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;
956
957 /* Check if there are actual msgs to be processed */
K. Y. Srinivasan4061ed92015-01-09 23:54:32 -0800958 if (msg->header.message_type != HVMSG_NONE) {
959 if (msg->header.message_type == HVMSG_TIMER_EXPIRED)
960 hv_process_timer_expiration(msg, cpu);
961 else
K. Y. Srinivasand81274a2016-02-26 15:13:21 -0800962 tasklet_schedule(hv_context.msg_dpc[cpu]);
K. Y. Srinivasan4061ed92015-01-09 23:54:32 -0800963 }
Stephan Mueller4b44f2d2016-05-02 02:14:34 -0400964
965 add_interrupt_randomness(HYPERVISOR_CALLBACK_VECTOR, 0);
K. Y. Srinivasan793be9c2011-03-15 15:03:43 -0700966}
967
Vitaly Kuznetsove5132292015-02-27 11:25:51 -0800968
Hank Janssen3e189512010-03-04 22:11:00 +0000969/*
Greg Kroah-Hartman90c99602009-09-02 07:11:14 -0700970 * vmbus_bus_init -Main vmbus driver initialization routine.
971 *
972 * Here, we
Lars Lindley0686e4f2010-03-11 23:51:23 +0100973 * - initialize the vmbus driver context
Lars Lindley0686e4f2010-03-11 23:51:23 +0100974 * - invoke the vmbus hv main init routine
Lars Lindley0686e4f2010-03-11 23:51:23 +0100975 * - retrieve the channel offers
Greg Kroah-Hartman90c99602009-09-02 07:11:14 -0700976 */
K. Y. Srinivasanefc26722015-12-14 16:01:46 -0800977static int vmbus_bus_init(void)
Hank Janssen3e7ee492009-07-13 16:02:34 -0700978{
Greg Kroah-Hartman90c99602009-09-02 07:11:14 -0700979 int ret;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700980
Greg Kroah-Hartman6d26e38fa22010-12-02 12:08:08 -0800981 /* Hypervisor initialization...setup hypercall page..etc */
982 ret = hv_init();
Greg Kroah-Hartman90c99602009-09-02 07:11:14 -0700983 if (ret != 0) {
Hank Janssen0a466182011-03-29 13:58:47 -0700984 pr_err("Unable to initialize the hypervisor - 0x%x\n", ret);
K. Y. Srinivasand6c1c5d2011-06-06 15:50:08 -0700985 return ret;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700986 }
987
K. Y. Srinivasan9adcac52011-04-29 13:45:08 -0700988 ret = bus_register(&hv_bus);
K. Y. Srinivasand6c1c5d2011-06-06 15:50:08 -0700989 if (ret)
K. Y. Srinivasan8b9987e2011-08-31 14:35:55 -0700990 goto err_cleanup;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700991
Thomas Gleixner76d388c2014-03-05 13:42:14 +0100992 hv_setup_vmbus_irq(vmbus_isr);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700993
Jason Wang2608fb62013-06-19 11:28:10 +0800994 ret = hv_synic_alloc();
995 if (ret)
996 goto err_alloc;
K. Y. Srinivasan800b6902011-03-15 15:03:33 -0700997 /*
K. Y. Srinivasan302a3c02013-02-17 11:30:44 -0800998 * Initialize the per-cpu interrupt state and
K. Y. Srinivasan800b6902011-03-15 15:03:33 -0700999 * connect to the host.
1000 */
Vitaly Kuznetsov76d36ab2016-12-07 14:53:11 -08001001 ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/hyperv:online",
1002 hv_synic_init, hv_synic_cleanup);
1003 if (ret < 0)
1004 goto err_alloc;
1005 hyperv_cpuhp_online = ret;
1006
K. Y. Srinivasan800b6902011-03-15 15:03:33 -07001007 ret = vmbus_connect();
K. Y. Srinivasan8b9987e2011-08-31 14:35:55 -07001008 if (ret)
Andrey Smetanin17efbee2015-12-14 16:01:38 -08001009 goto err_connect;
K. Y. Srinivasan800b6902011-03-15 15:03:33 -07001010
Nick Meier96c1d052015-02-28 11:39:01 -08001011 /*
1012 * Only register if the crash MSRs are available
1013 */
Denis V. Lunevcc2dd402015-08-01 16:08:20 -07001014 if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
Vitaly Kuznetsov510f7ae2015-08-01 16:08:10 -07001015 register_die_notifier(&hyperv_die_block);
Nick Meier96c1d052015-02-28 11:39:01 -08001016 atomic_notifier_chain_register(&panic_notifier_list,
1017 &hyperv_panic_block);
1018 }
1019
Greg Kroah-Hartman2d6e8822010-12-02 08:50:58 -08001020 vmbus_request_offers();
Haiyang Zhang8b5d6d32010-05-28 23:22:44 +00001021
K. Y. Srinivasand6c1c5d2011-06-06 15:50:08 -07001022 return 0;
K. Y. Srinivasan8b9987e2011-08-31 14:35:55 -07001023
Andrey Smetanin17efbee2015-12-14 16:01:38 -08001024err_connect:
Vitaly Kuznetsov76d36ab2016-12-07 14:53:11 -08001025 cpuhp_remove_state(hyperv_cpuhp_online);
Jason Wang2608fb62013-06-19 11:28:10 +08001026err_alloc:
1027 hv_synic_free();
Thomas Gleixner76d388c2014-03-05 13:42:14 +01001028 hv_remove_vmbus_irq();
K. Y. Srinivasan8b9987e2011-08-31 14:35:55 -07001029
K. Y. Srinivasan8b9987e2011-08-31 14:35:55 -07001030 bus_unregister(&hv_bus);
1031
1032err_cleanup:
Vitaly Kuznetsova9f61ca2016-06-03 17:09:22 -07001033 hv_cleanup(false);
K. Y. Srinivasan8b9987e2011-08-31 14:35:55 -07001034
1035 return ret;
Hank Janssen3e7ee492009-07-13 16:02:34 -07001036}
1037
Greg Kroah-Hartman90c99602009-09-02 07:11:14 -07001038/**
Jake Oshins35464482015-08-05 00:52:37 -07001039 * __vmbus_child_driver_register() - Register a vmbus's driver
1040 * @hv_driver: Pointer to driver structure you want to register
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001041 * @owner: owner module of the drv
1042 * @mod_name: module name string
Hank Janssen3e189512010-03-04 22:11:00 +00001043 *
1044 * Registers the given driver with Linux through the 'driver_register()' call
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001045 * and sets up the hyper-v vmbus handling for this driver.
Hank Janssen3e189512010-03-04 22:11:00 +00001046 * It will return the state of the 'driver_register()' call.
1047 *
Greg Kroah-Hartman90c99602009-09-02 07:11:14 -07001048 */
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001049int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name)
Hank Janssen3e7ee492009-07-13 16:02:34 -07001050{
Bill Pemberton5d48a1c2009-07-27 16:47:36 -04001051 int ret;
Hank Janssen3e7ee492009-07-13 16:02:34 -07001052
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001053 pr_info("registering driver %s\n", hv_driver->name);
Hank Janssen3e7ee492009-07-13 16:02:34 -07001054
K. Y. Srinivasancf6a2ea2011-12-01 09:59:34 -08001055 ret = vmbus_exists();
1056 if (ret < 0)
1057 return ret;
1058
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001059 hv_driver->driver.name = hv_driver->name;
1060 hv_driver->driver.owner = owner;
1061 hv_driver->driver.mod_name = mod_name;
1062 hv_driver->driver.bus = &hv_bus;
Hank Janssen3e7ee492009-07-13 16:02:34 -07001063
Stephen Hemmingerfc769362016-12-03 12:34:39 -08001064 spin_lock_init(&hv_driver->dynids.lock);
1065 INIT_LIST_HEAD(&hv_driver->dynids.list);
1066
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001067 ret = driver_register(&hv_driver->driver);
Hank Janssen3e7ee492009-07-13 16:02:34 -07001068
Bill Pemberton5d48a1c2009-07-27 16:47:36 -04001069 return ret;
Hank Janssen3e7ee492009-07-13 16:02:34 -07001070}
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001071EXPORT_SYMBOL_GPL(__vmbus_driver_register);
Hank Janssen3e7ee492009-07-13 16:02:34 -07001072
Greg Kroah-Hartman90c99602009-09-02 07:11:14 -07001073/**
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001074 * vmbus_driver_unregister() - Unregister a vmbus's driver
Jake Oshins35464482015-08-05 00:52:37 -07001075 * @hv_driver: Pointer to driver structure you want to
1076 * un-register
Hank Janssen3e189512010-03-04 22:11:00 +00001077 *
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001078 * Un-register the given driver that was previous registered with a call to
1079 * vmbus_driver_register()
Greg Kroah-Hartman90c99602009-09-02 07:11:14 -07001080 */
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001081void vmbus_driver_unregister(struct hv_driver *hv_driver)
Hank Janssen3e7ee492009-07-13 16:02:34 -07001082{
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001083 pr_info("unregistering driver %s\n", hv_driver->name);
Hank Janssen3e7ee492009-07-13 16:02:34 -07001084
Stephen Hemmingerfc769362016-12-03 12:34:39 -08001085 if (!vmbus_exists()) {
K. Y. Srinivasan8f257a12011-12-27 13:49:37 -08001086 driver_unregister(&hv_driver->driver);
Stephen Hemmingerfc769362016-12-03 12:34:39 -08001087 vmbus_free_dynids(hv_driver);
1088 }
Hank Janssen3e7ee492009-07-13 16:02:34 -07001089}
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001090EXPORT_SYMBOL_GPL(vmbus_driver_unregister);
Hank Janssen3e7ee492009-07-13 16:02:34 -07001091
Hank Janssen3e189512010-03-04 22:11:00 +00001092/*
K. Y. Srinivasanf2c73012011-09-08 07:24:12 -07001093 * vmbus_device_create - Creates and registers a new child device
Hank Janssen3e189512010-03-04 22:11:00 +00001094 * on the vmbus.
Greg Kroah-Hartman90c99602009-09-02 07:11:14 -07001095 */
stephen hemminger1b9d48f2014-06-03 08:38:15 -07001096struct hv_device *vmbus_device_create(const uuid_le *type,
1097 const uuid_le *instance,
1098 struct vmbus_channel *channel)
Hank Janssen3e7ee492009-07-13 16:02:34 -07001099{
Nicolas Palix3d3b5512009-07-28 17:32:53 +02001100 struct hv_device *child_device_obj;
Hank Janssen3e7ee492009-07-13 16:02:34 -07001101
K. Y. Srinivasan6bad88da2011-03-07 13:35:48 -08001102 child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL);
1103 if (!child_device_obj) {
Hank Janssen0a466182011-03-29 13:58:47 -07001104 pr_err("Unable to allocate device object for child device\n");
Hank Janssen3e7ee492009-07-13 16:02:34 -07001105 return NULL;
1106 }
1107
Greg Kroah-Hartmancae5b842010-10-21 09:05:27 -07001108 child_device_obj->channel = channel;
K. Y. Srinivasan358d2ee2011-08-25 09:48:28 -07001109 memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le));
Haiyang Zhangca623ad2011-01-26 12:12:11 -08001110 memcpy(&child_device_obj->dev_instance, instance,
K. Y. Srinivasan358d2ee2011-08-25 09:48:28 -07001111 sizeof(uuid_le));
K. Y. Srinivasan7047f172015-12-25 20:00:30 -08001112 child_device_obj->vendor_id = 0x1414; /* MSFT vendor ID */
Hank Janssen3e7ee492009-07-13 16:02:34 -07001113
Hank Janssen3e7ee492009-07-13 16:02:34 -07001114
Hank Janssen3e7ee492009-07-13 16:02:34 -07001115 return child_device_obj;
1116}
1117
Hank Janssen3e189512010-03-04 22:11:00 +00001118/*
K. Y. Srinivasan227942812011-09-08 07:24:13 -07001119 * vmbus_device_register - Register the child device
Greg Kroah-Hartman90c99602009-09-02 07:11:14 -07001120 */
K. Y. Srinivasan227942812011-09-08 07:24:13 -07001121int vmbus_device_register(struct hv_device *child_device_obj)
Hank Janssen3e7ee492009-07-13 16:02:34 -07001122{
Greg Kroah-Hartman90c99602009-09-02 07:11:14 -07001123 int ret = 0;
K. Y. Srinivasan6bad88da2011-03-07 13:35:48 -08001124
Stephen Hemmingerf6b2db02016-11-01 00:01:59 -07001125 dev_set_name(&child_device_obj->device, "%pUl",
Vitaly Kuznetsovb2948092016-09-16 09:01:17 -07001126 child_device_obj->channel->offermsg.offer.if_instance.b);
Hank Janssen3e7ee492009-07-13 16:02:34 -07001127
K. Y. Srinivasan0bce28b2011-08-27 11:31:39 -07001128 child_device_obj->device.bus = &hv_bus;
K. Y. Srinivasan607c1a12011-06-06 15:49:39 -07001129 child_device_obj->device.parent = &hv_acpi_dev->dev;
K. Y. Srinivasan6bad88da2011-03-07 13:35:48 -08001130 child_device_obj->device.release = vmbus_device_release;
Hank Janssen3e7ee492009-07-13 16:02:34 -07001131
Greg Kroah-Hartman90c99602009-09-02 07:11:14 -07001132 /*
1133 * Register with the LDM. This will kick off the driver/device
1134 * binding...which will eventually call vmbus_match() and vmbus_probe()
1135 */
K. Y. Srinivasan6bad88da2011-03-07 13:35:48 -08001136 ret = device_register(&child_device_obj->device);
Hank Janssen3e7ee492009-07-13 16:02:34 -07001137
Hank Janssen3e7ee492009-07-13 16:02:34 -07001138 if (ret)
Hank Janssen0a466182011-03-29 13:58:47 -07001139 pr_err("Unable to register child device\n");
Hank Janssen3e7ee492009-07-13 16:02:34 -07001140 else
Fernando Soto84672362013-06-14 23:13:35 +00001141 pr_debug("child device %s registered\n",
Hank Janssen0a466182011-03-29 13:58:47 -07001142 dev_name(&child_device_obj->device));
Hank Janssen3e7ee492009-07-13 16:02:34 -07001143
Hank Janssen3e7ee492009-07-13 16:02:34 -07001144 return ret;
1145}
1146
Hank Janssen3e189512010-03-04 22:11:00 +00001147/*
K. Y. Srinivasan696453b2011-09-08 07:24:14 -07001148 * vmbus_device_unregister - Remove the specified child device
Hank Janssen3e189512010-03-04 22:11:00 +00001149 * from the vmbus.
Greg Kroah-Hartman90c99602009-09-02 07:11:14 -07001150 */
K. Y. Srinivasan696453b2011-09-08 07:24:14 -07001151void vmbus_device_unregister(struct hv_device *device_obj)
Hank Janssen3e7ee492009-07-13 16:02:34 -07001152{
Fernando Soto84672362013-06-14 23:13:35 +00001153 pr_debug("child device %s unregistered\n",
1154 dev_name(&device_obj->device));
1155
Greg Kroah-Hartman90c99602009-09-02 07:11:14 -07001156 /*
1157 * Kick off the process of unregistering the device.
1158 * This will call vmbus_remove() and eventually vmbus_device_release()
1159 */
K. Y. Srinivasan6bad88da2011-03-07 13:35:48 -08001160 device_unregister(&device_obj->device);
Hank Janssen3e7ee492009-07-13 16:02:34 -07001161}
1162
Hank Janssen3e7ee492009-07-13 16:02:34 -07001163
K. Y. Srinivasanb0069f42011-04-29 13:45:15 -07001164/*
Jake Oshins7f163a62015-08-05 00:52:36 -07001165 * VMBUS is an acpi enumerated device. Get the information we
K. Y. Srinivasan90f34532014-01-29 18:14:39 -08001166 * need from DSDT.
K. Y. Srinivasanb0069f42011-04-29 13:45:15 -07001167 */
Jake Oshins7f163a62015-08-05 00:52:36 -07001168#define VTPM_BASE_ADDRESS 0xfed40000
K. Y. Srinivasan90f34532014-01-29 18:14:39 -08001169static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx)
K. Y. Srinivasanb0069f42011-04-29 13:45:15 -07001170{
Jake Oshins7f163a62015-08-05 00:52:36 -07001171 resource_size_t start = 0;
1172 resource_size_t end = 0;
1173 struct resource *new_res;
1174 struct resource **old_res = &hyperv_mmio;
1175 struct resource **prev_res = NULL;
1176
K. Y. Srinivasan90f34532014-01-29 18:14:39 -08001177 switch (res->type) {
Jake Oshins7f163a62015-08-05 00:52:36 -07001178
1179 /*
1180 * "Address" descriptors are for bus windows. Ignore
1181 * "memory" descriptors, which are for registers on
1182 * devices.
1183 */
1184 case ACPI_RESOURCE_TYPE_ADDRESS32:
1185 start = res->data.address32.address.minimum;
1186 end = res->data.address32.address.maximum;
Gerd Hoffmann4eb923f2014-02-24 14:17:08 +01001187 break;
K. Y. Srinivasanb0069f42011-04-29 13:45:15 -07001188
K. Y. Srinivasan90f34532014-01-29 18:14:39 -08001189 case ACPI_RESOURCE_TYPE_ADDRESS64:
Jake Oshins7f163a62015-08-05 00:52:36 -07001190 start = res->data.address64.address.minimum;
1191 end = res->data.address64.address.maximum;
Gerd Hoffmann4eb923f2014-02-24 14:17:08 +01001192 break;
Jake Oshins7f163a62015-08-05 00:52:36 -07001193
1194 default:
1195 /* Unused resource type */
1196 return AE_OK;
1197
K. Y. Srinivasanb0069f42011-04-29 13:45:15 -07001198 }
Jake Oshins7f163a62015-08-05 00:52:36 -07001199 /*
1200 * Ignore ranges that are below 1MB, as they're not
1201 * necessary or useful here.
1202 */
1203 if (end < 0x100000)
1204 return AE_OK;
1205
1206 new_res = kzalloc(sizeof(*new_res), GFP_ATOMIC);
1207 if (!new_res)
1208 return AE_NO_MEMORY;
1209
1210 /* If this range overlaps the virtual TPM, truncate it. */
1211 if (end > VTPM_BASE_ADDRESS && start < VTPM_BASE_ADDRESS)
1212 end = VTPM_BASE_ADDRESS;
1213
1214 new_res->name = "hyperv mmio";
1215 new_res->flags = IORESOURCE_MEM;
1216 new_res->start = start;
1217 new_res->end = end;
1218
Jake Oshins40f26f32015-12-14 16:01:52 -08001219 /*
Jake Oshins40f26f32015-12-14 16:01:52 -08001220 * If two ranges are adjacent, merge them.
1221 */
Jake Oshins7f163a62015-08-05 00:52:36 -07001222 do {
1223 if (!*old_res) {
1224 *old_res = new_res;
1225 break;
1226 }
1227
Jake Oshins40f26f32015-12-14 16:01:52 -08001228 if (((*old_res)->end + 1) == new_res->start) {
1229 (*old_res)->end = new_res->end;
1230 kfree(new_res);
1231 break;
1232 }
1233
1234 if ((*old_res)->start == new_res->end + 1) {
1235 (*old_res)->start = new_res->start;
1236 kfree(new_res);
1237 break;
1238 }
1239
Jake Oshins23a06832016-04-05 10:22:53 -07001240 if ((*old_res)->start > new_res->end) {
Jake Oshins7f163a62015-08-05 00:52:36 -07001241 new_res->sibling = *old_res;
1242 if (prev_res)
1243 (*prev_res)->sibling = new_res;
1244 *old_res = new_res;
1245 break;
1246 }
1247
1248 prev_res = old_res;
1249 old_res = &(*old_res)->sibling;
1250
1251 } while (1);
K. Y. Srinivasanb0069f42011-04-29 13:45:15 -07001252
1253 return AE_OK;
1254}
1255
Jake Oshins7f163a62015-08-05 00:52:36 -07001256static int vmbus_acpi_remove(struct acpi_device *device)
1257{
1258 struct resource *cur_res;
1259 struct resource *next_res;
1260
1261 if (hyperv_mmio) {
Jake Oshins6d146ae2016-04-05 10:22:55 -07001262 if (fb_mmio) {
1263 __release_region(hyperv_mmio, fb_mmio->start,
1264 resource_size(fb_mmio));
1265 fb_mmio = NULL;
1266 }
1267
Jake Oshins7f163a62015-08-05 00:52:36 -07001268 for (cur_res = hyperv_mmio; cur_res; cur_res = next_res) {
1269 next_res = cur_res->sibling;
1270 kfree(cur_res);
1271 }
1272 }
1273
1274 return 0;
1275}
1276
Jake Oshins6d146ae2016-04-05 10:22:55 -07001277static void vmbus_reserve_fb(void)
1278{
1279 int size;
1280 /*
1281 * Make a claim for the frame buffer in the resource tree under the
1282 * first node, which will be the one below 4GB. The length seems to
1283 * be underreported, particularly in a Generation 1 VM. So start out
1284 * reserving a larger area and make it smaller until it succeeds.
1285 */
1286
1287 if (screen_info.lfb_base) {
1288 if (efi_enabled(EFI_BOOT))
1289 size = max_t(__u32, screen_info.lfb_size, 0x800000);
1290 else
1291 size = max_t(__u32, screen_info.lfb_size, 0x4000000);
1292
1293 for (; !fb_mmio && (size >= 0x100000); size >>= 1) {
1294 fb_mmio = __request_region(hyperv_mmio,
1295 screen_info.lfb_base, size,
1296 fb_mmio_name, 0);
1297 }
1298 }
1299}
1300
Jake Oshins35464482015-08-05 00:52:37 -07001301/**
1302 * vmbus_allocate_mmio() - Pick a memory-mapped I/O range.
1303 * @new: If successful, supplied a pointer to the
1304 * allocated MMIO space.
1305 * @device_obj: Identifies the caller
1306 * @min: Minimum guest physical address of the
1307 * allocation
1308 * @max: Maximum guest physical address
1309 * @size: Size of the range to be allocated
1310 * @align: Alignment of the range to be allocated
1311 * @fb_overlap_ok: Whether this allocation can be allowed
1312 * to overlap the video frame buffer.
1313 *
1314 * This function walks the resources granted to VMBus by the
1315 * _CRS object in the ACPI namespace underneath the parent
1316 * "bridge" whether that's a root PCI bus in the Generation 1
1317 * case or a Module Device in the Generation 2 case. It then
1318 * attempts to allocate from the global MMIO pool in a way that
1319 * matches the constraints supplied in these parameters and by
1320 * that _CRS.
1321 *
1322 * Return: 0 on success, -errno on failure
1323 */
1324int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
1325 resource_size_t min, resource_size_t max,
1326 resource_size_t size, resource_size_t align,
1327 bool fb_overlap_ok)
1328{
Jake Oshinsbe000f92016-04-05 10:22:54 -07001329 struct resource *iter, *shadow;
Jake Oshinsea37a6b2016-04-05 10:22:56 -07001330 resource_size_t range_min, range_max, start;
Jake Oshins35464482015-08-05 00:52:37 -07001331 const char *dev_n = dev_name(&device_obj->device);
Jake Oshinsea37a6b2016-04-05 10:22:56 -07001332 int retval;
Jake Oshinse16dad62016-04-05 10:22:50 -07001333
1334 retval = -ENXIO;
1335 down(&hyperv_mmio_lock);
Jake Oshins35464482015-08-05 00:52:37 -07001336
Jake Oshinsea37a6b2016-04-05 10:22:56 -07001337 /*
1338 * If overlaps with frame buffers are allowed, then first attempt to
1339 * make the allocation from within the reserved region. Because it
1340 * is already reserved, no shadow allocation is necessary.
1341 */
1342 if (fb_overlap_ok && fb_mmio && !(min > fb_mmio->end) &&
1343 !(max < fb_mmio->start)) {
1344
1345 range_min = fb_mmio->start;
1346 range_max = fb_mmio->end;
1347 start = (range_min + align - 1) & ~(align - 1);
1348 for (; start + size - 1 <= range_max; start += align) {
1349 *new = request_mem_region_exclusive(start, size, dev_n);
1350 if (*new) {
1351 retval = 0;
1352 goto exit;
1353 }
1354 }
1355 }
1356
Jake Oshins35464482015-08-05 00:52:37 -07001357 for (iter = hyperv_mmio; iter; iter = iter->sibling) {
1358 if ((iter->start >= max) || (iter->end <= min))
1359 continue;
1360
1361 range_min = iter->start;
1362 range_max = iter->end;
Jake Oshinsea37a6b2016-04-05 10:22:56 -07001363 start = (range_min + align - 1) & ~(align - 1);
1364 for (; start + size - 1 <= range_max; start += align) {
1365 shadow = __request_region(iter, start, size, NULL,
1366 IORESOURCE_BUSY);
1367 if (!shadow)
1368 continue;
Jake Oshins35464482015-08-05 00:52:37 -07001369
Jake Oshinsea37a6b2016-04-05 10:22:56 -07001370 *new = request_mem_region_exclusive(start, size, dev_n);
1371 if (*new) {
1372 shadow->name = (char *)*new;
1373 retval = 0;
1374 goto exit;
Jake Oshins35464482015-08-05 00:52:37 -07001375 }
1376
Jake Oshinsea37a6b2016-04-05 10:22:56 -07001377 __release_region(iter, start, size);
Jake Oshins35464482015-08-05 00:52:37 -07001378 }
1379 }
1380
Jake Oshinse16dad62016-04-05 10:22:50 -07001381exit:
1382 up(&hyperv_mmio_lock);
1383 return retval;
Jake Oshins35464482015-08-05 00:52:37 -07001384}
1385EXPORT_SYMBOL_GPL(vmbus_allocate_mmio);
1386
Jake Oshins619848b2015-12-14 16:01:39 -08001387/**
Jake Oshins97fb77dc2016-04-05 10:22:51 -07001388 * vmbus_free_mmio() - Free a memory-mapped I/O range.
1389 * @start: Base address of region to release.
1390 * @size: Size of the range to be allocated
1391 *
1392 * This function releases anything requested by
1393 * vmbus_mmio_allocate().
1394 */
1395void vmbus_free_mmio(resource_size_t start, resource_size_t size)
1396{
Jake Oshinsbe000f92016-04-05 10:22:54 -07001397 struct resource *iter;
1398
1399 down(&hyperv_mmio_lock);
1400 for (iter = hyperv_mmio; iter; iter = iter->sibling) {
1401 if ((iter->start >= start + size) || (iter->end <= start))
1402 continue;
1403
1404 __release_region(iter, start, size);
1405 }
Jake Oshins97fb77dc2016-04-05 10:22:51 -07001406 release_mem_region(start, size);
Jake Oshinsbe000f92016-04-05 10:22:54 -07001407 up(&hyperv_mmio_lock);
Jake Oshins97fb77dc2016-04-05 10:22:51 -07001408
1409}
1410EXPORT_SYMBOL_GPL(vmbus_free_mmio);
1411
1412/**
Jake Oshins619848b2015-12-14 16:01:39 -08001413 * vmbus_cpu_number_to_vp_number() - Map CPU to VP.
1414 * @cpu_number: CPU number in Linux terms
1415 *
1416 * This function returns the mapping between the Linux processor
1417 * number and the hypervisor's virtual processor number, useful
1418 * in making hypercalls and such that talk about specific
1419 * processors.
1420 *
1421 * Return: Virtual processor number in Hyper-V terms
1422 */
1423int vmbus_cpu_number_to_vp_number(int cpu_number)
1424{
1425 return hv_context.vp_index[cpu_number];
1426}
1427EXPORT_SYMBOL_GPL(vmbus_cpu_number_to_vp_number);
1428
K. Y. Srinivasanb0069f42011-04-29 13:45:15 -07001429static int vmbus_acpi_add(struct acpi_device *device)
1430{
1431 acpi_status result;
K. Y. Srinivasan90f34532014-01-29 18:14:39 -08001432 int ret_val = -ENODEV;
Jake Oshins7f163a62015-08-05 00:52:36 -07001433 struct acpi_device *ancestor;
K. Y. Srinivasanb0069f42011-04-29 13:45:15 -07001434
K. Y. Srinivasan607c1a12011-06-06 15:49:39 -07001435 hv_acpi_dev = device;
1436
K. Y. Srinivasan0a4425b2011-08-27 11:31:38 -07001437 result = acpi_walk_resources(device->handle, METHOD_NAME__CRS,
K. Y. Srinivasan90f34532014-01-29 18:14:39 -08001438 vmbus_walk_resources, NULL);
K. Y. Srinivasanb0069f42011-04-29 13:45:15 -07001439
K. Y. Srinivasan90f34532014-01-29 18:14:39 -08001440 if (ACPI_FAILURE(result))
1441 goto acpi_walk_err;
1442 /*
Jake Oshins7f163a62015-08-05 00:52:36 -07001443 * Some ancestor of the vmbus acpi device (Gen1 or Gen2
1444 * firmware) is the VMOD that has the mmio ranges. Get that.
K. Y. Srinivasan90f34532014-01-29 18:14:39 -08001445 */
Jake Oshins7f163a62015-08-05 00:52:36 -07001446 for (ancestor = device->parent; ancestor; ancestor = ancestor->parent) {
1447 result = acpi_walk_resources(ancestor->handle, METHOD_NAME__CRS,
1448 vmbus_walk_resources, NULL);
K. Y. Srinivasan90f34532014-01-29 18:14:39 -08001449
1450 if (ACPI_FAILURE(result))
Jake Oshins7f163a62015-08-05 00:52:36 -07001451 continue;
Jake Oshins6d146ae2016-04-05 10:22:55 -07001452 if (hyperv_mmio) {
1453 vmbus_reserve_fb();
Jake Oshins7f163a62015-08-05 00:52:36 -07001454 break;
Jake Oshins6d146ae2016-04-05 10:22:55 -07001455 }
K. Y. Srinivasanb0069f42011-04-29 13:45:15 -07001456 }
K. Y. Srinivasan90f34532014-01-29 18:14:39 -08001457 ret_val = 0;
1458
1459acpi_walk_err:
K. Y. Srinivasanb0069f42011-04-29 13:45:15 -07001460 complete(&probe_event);
Jake Oshins7f163a62015-08-05 00:52:36 -07001461 if (ret_val)
1462 vmbus_acpi_remove(device);
K. Y. Srinivasan90f34532014-01-29 18:14:39 -08001463 return ret_val;
K. Y. Srinivasanb0069f42011-04-29 13:45:15 -07001464}
1465
1466static const struct acpi_device_id vmbus_acpi_device_ids[] = {
1467 {"VMBUS", 0},
K. Y. Srinivasan9d7b18d2011-06-06 15:49:42 -07001468 {"VMBus", 0},
K. Y. Srinivasanb0069f42011-04-29 13:45:15 -07001469 {"", 0},
1470};
1471MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids);
1472
1473static struct acpi_driver vmbus_acpi_driver = {
1474 .name = "vmbus",
1475 .ids = vmbus_acpi_device_ids,
1476 .ops = {
1477 .add = vmbus_acpi_add,
Vitaly Kuznetsove4ecb412015-04-22 21:31:28 -07001478 .remove = vmbus_acpi_remove,
K. Y. Srinivasanb0069f42011-04-29 13:45:15 -07001479 },
1480};
1481
Vitaly Kuznetsov25172812015-08-01 16:08:07 -07001482static void hv_kexec_handler(void)
1483{
Vitaly Kuznetsov25172812015-08-01 16:08:07 -07001484 hv_synic_clockevents_cleanup();
Vitaly Kuznetsov75ff3a82016-02-26 15:13:16 -08001485 vmbus_initiate_unload(false);
Vitaly Kuznetsov523b9402016-12-07 14:53:12 -08001486 vmbus_connection.conn_state = DISCONNECTED;
1487 /* Make sure conn_state is set as hv_synic_cleanup checks for it */
1488 mb();
Vitaly Kuznetsov76d36ab2016-12-07 14:53:11 -08001489 cpuhp_remove_state(hyperv_cpuhp_online);
Vitaly Kuznetsova9f61ca2016-06-03 17:09:22 -07001490 hv_cleanup(false);
Vitaly Kuznetsov25172812015-08-01 16:08:07 -07001491};
1492
Vitaly Kuznetsovb4370df2015-08-01 16:08:09 -07001493static void hv_crash_handler(struct pt_regs *regs)
1494{
Vitaly Kuznetsov75ff3a82016-02-26 15:13:16 -08001495 vmbus_initiate_unload(true);
Vitaly Kuznetsovb4370df2015-08-01 16:08:09 -07001496 /*
1497 * In crash handler we can't schedule synic cleanup for all CPUs,
1498 * doing the cleanup for current CPU only. This should be sufficient
1499 * for kdump.
1500 */
Vitaly Kuznetsov523b9402016-12-07 14:53:12 -08001501 vmbus_connection.conn_state = DISCONNECTED;
Vitaly Kuznetsov76d36ab2016-12-07 14:53:11 -08001502 hv_synic_cleanup(smp_processor_id());
Vitaly Kuznetsova9f61ca2016-06-03 17:09:22 -07001503 hv_cleanup(true);
Vitaly Kuznetsovb4370df2015-08-01 16:08:09 -07001504};
1505
K. Y. Srinivasan607c1a12011-06-06 15:49:39 -07001506static int __init hv_acpi_init(void)
K. Y. Srinivasan1168ac22011-03-15 15:03:32 -07001507{
K. Y. Srinivasan2dda95f2011-07-15 13:38:56 -07001508 int ret, t;
K. Y. Srinivasanb0069f42011-04-29 13:45:15 -07001509
Jason Wang1f94ea82012-08-31 13:32:44 +08001510 if (x86_hyper != &x86_hyper_ms_hyperv)
Jason Wang05929692012-08-17 18:52:43 +08001511 return -ENODEV;
1512
K. Y. Srinivasanb0069f42011-04-29 13:45:15 -07001513 init_completion(&probe_event);
1514
1515 /*
K. Y. Srinivasanefc26722015-12-14 16:01:46 -08001516 * Get ACPI resources first.
K. Y. Srinivasanb0069f42011-04-29 13:45:15 -07001517 */
K. Y. Srinivasan02466042011-06-06 15:49:40 -07001518 ret = acpi_bus_register_driver(&vmbus_acpi_driver);
1519
K. Y. Srinivasanb0069f42011-04-29 13:45:15 -07001520 if (ret)
1521 return ret;
1522
K. Y. Srinivasan2dda95f2011-07-15 13:38:56 -07001523 t = wait_for_completion_timeout(&probe_event, 5*HZ);
1524 if (t == 0) {
1525 ret = -ETIMEDOUT;
1526 goto cleanup;
1527 }
K. Y. Srinivasanb0069f42011-04-29 13:45:15 -07001528
K. Y. Srinivasanefc26722015-12-14 16:01:46 -08001529 ret = vmbus_bus_init();
K. Y. Srinivasan91fd7992011-06-16 13:16:38 -07001530 if (ret)
K. Y. Srinivasan2dda95f2011-07-15 13:38:56 -07001531 goto cleanup;
1532
Vitaly Kuznetsov25172812015-08-01 16:08:07 -07001533 hv_setup_kexec_handler(hv_kexec_handler);
Vitaly Kuznetsovb4370df2015-08-01 16:08:09 -07001534 hv_setup_crash_handler(hv_crash_handler);
Vitaly Kuznetsov25172812015-08-01 16:08:07 -07001535
K. Y. Srinivasan2dda95f2011-07-15 13:38:56 -07001536 return 0;
1537
1538cleanup:
1539 acpi_bus_unregister_driver(&vmbus_acpi_driver);
K. Y. Srinivasancf6a2ea2011-12-01 09:59:34 -08001540 hv_acpi_dev = NULL;
K. Y. Srinivasan91fd7992011-06-16 13:16:38 -07001541 return ret;
K. Y. Srinivasan1168ac22011-03-15 15:03:32 -07001542}
1543
K. Y. Srinivasan93e5bd02011-12-12 09:29:17 -08001544static void __exit vmbus_exit(void)
1545{
Vitaly Kuznetsove72e7ac2015-02-27 11:25:55 -08001546 int cpu;
1547
Vitaly Kuznetsov25172812015-08-01 16:08:07 -07001548 hv_remove_kexec_handler();
Vitaly Kuznetsovb4370df2015-08-01 16:08:09 -07001549 hv_remove_crash_handler();
Vitaly Kuznetsov09a19622015-02-27 11:25:54 -08001550 vmbus_connection.conn_state = DISCONNECTED;
Vitaly Kuznetsove0867482015-02-27 11:25:57 -08001551 hv_synic_clockevents_cleanup();
K. Y. Srinivasan2db84ef2015-04-22 21:31:32 -07001552 vmbus_disconnect();
Thomas Gleixner76d388c2014-03-05 13:42:14 +01001553 hv_remove_vmbus_irq();
K. Y. Srinivasand81274a2016-02-26 15:13:21 -08001554 for_each_online_cpu(cpu)
1555 tasklet_kill(hv_context.msg_dpc[cpu]);
K. Y. Srinivasan93e5bd02011-12-12 09:29:17 -08001556 vmbus_free_channels();
Denis V. Lunevcc2dd402015-08-01 16:08:20 -07001557 if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
Vitaly Kuznetsov510f7ae2015-08-01 16:08:10 -07001558 unregister_die_notifier(&hyperv_die_block);
Vitaly Kuznetsov096c6052015-04-22 21:31:29 -07001559 atomic_notifier_chain_unregister(&panic_notifier_list,
1560 &hyperv_panic_block);
1561 }
K. Y. Srinivasan93e5bd02011-12-12 09:29:17 -08001562 bus_unregister(&hv_bus);
Vitaly Kuznetsova9f61ca2016-06-03 17:09:22 -07001563 hv_cleanup(false);
Vitaly Kuznetsov1959a282015-05-06 17:47:41 -07001564 for_each_online_cpu(cpu) {
1565 tasklet_kill(hv_context.event_dpc[cpu]);
Vitaly Kuznetsov1959a282015-05-06 17:47:41 -07001566 }
Vitaly Kuznetsov76d36ab2016-12-07 14:53:11 -08001567 cpuhp_remove_state(hyperv_cpuhp_online);
Vitaly Kuznetsov06210b42f2015-08-01 16:08:05 -07001568 hv_synic_free();
K. Y. Srinivasan93e5bd02011-12-12 09:29:17 -08001569 acpi_bus_unregister_driver(&vmbus_acpi_driver);
1570}
1571
K. Y. Srinivasan1168ac22011-03-15 15:03:32 -07001572
Greg Kroah-Hartman90c99602009-09-02 07:11:14 -07001573MODULE_LICENSE("GPL");
Hank Janssen3e7ee492009-07-13 16:02:34 -07001574
K. Y. Srinivasan43d4e112011-10-24 11:28:12 -07001575subsys_initcall(hv_acpi_init);
K. Y. Srinivasan93e5bd02011-12-12 09:29:17 -08001576module_exit(vmbus_exit);