2 * Copyright (c) 2009, Microsoft Corporation.
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.
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
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.
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
20 * K. Y. Srinivasan <kys@microsoft.com>
23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
25 #include <linux/init.h>
26 #include <linux/module.h>
27 #include <linux/device.h>
28 #include <linux/interrupt.h>
29 #include <linux/sysctl.h>
30 #include <linux/slab.h>
31 #include <linux/acpi.h>
32 #include <linux/completion.h>
33 #include <linux/hyperv.h>
34 #include <linux/kernel_stat.h>
35 #include <linux/clockchips.h>
36 #include <linux/cpu.h>
37 #include <asm/hyperv.h>
38 #include <asm/hypervisor.h>
39 #include <asm/mshyperv.h>
40 #include <linux/notifier.h>
41 #include <linux/ptrace.h>
42 #include <linux/screen_info.h>
43 #include <linux/kdebug.h>
44 #include <linux/efi.h>
45 #include <linux/random.h>
46 #include "hyperv_vmbus.h"
49 struct list_head node
;
50 struct hv_vmbus_device_id id
;
53 static struct acpi_device
*hv_acpi_dev
;
55 static struct completion probe_event
;
57 static int hyperv_cpuhp_online
;
59 static int hyperv_panic_event(struct notifier_block
*nb
, unsigned long val
,
64 regs
= current_pt_regs();
66 hyperv_report_panic(regs
);
70 static int hyperv_die_event(struct notifier_block
*nb
, unsigned long val
,
73 struct die_args
*die
= (struct die_args
*)args
;
74 struct pt_regs
*regs
= die
->regs
;
76 hyperv_report_panic(regs
);
80 static struct notifier_block hyperv_die_block
= {
81 .notifier_call
= hyperv_die_event
,
83 static struct notifier_block hyperv_panic_block
= {
84 .notifier_call
= hyperv_panic_event
,
87 static const char *fb_mmio_name
= "fb_range";
88 static struct resource
*fb_mmio
;
89 static struct resource
*hyperv_mmio
;
90 static DEFINE_SEMAPHORE(hyperv_mmio_lock
);
92 static int vmbus_exists(void)
94 if (hv_acpi_dev
== NULL
)
100 #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2)
101 static void print_alias_name(struct hv_device
*hv_dev
, char *alias_name
)
104 for (i
= 0; i
< VMBUS_ALIAS_LEN
; i
+= 2)
105 sprintf(&alias_name
[i
], "%02x", hv_dev
->dev_type
.b
[i
/2]);
108 static u8
channel_monitor_group(struct vmbus_channel
*channel
)
110 return (u8
)channel
->offermsg
.monitorid
/ 32;
113 static u8
channel_monitor_offset(struct vmbus_channel
*channel
)
115 return (u8
)channel
->offermsg
.monitorid
% 32;
118 static u32
channel_pending(struct vmbus_channel
*channel
,
119 struct hv_monitor_page
*monitor_page
)
121 u8 monitor_group
= channel_monitor_group(channel
);
122 return monitor_page
->trigger_group
[monitor_group
].pending
;
125 static u32
channel_latency(struct vmbus_channel
*channel
,
126 struct hv_monitor_page
*monitor_page
)
128 u8 monitor_group
= channel_monitor_group(channel
);
129 u8 monitor_offset
= channel_monitor_offset(channel
);
130 return monitor_page
->latency
[monitor_group
][monitor_offset
];
133 static u32
channel_conn_id(struct vmbus_channel
*channel
,
134 struct hv_monitor_page
*monitor_page
)
136 u8 monitor_group
= channel_monitor_group(channel
);
137 u8 monitor_offset
= channel_monitor_offset(channel
);
138 return monitor_page
->parameter
[monitor_group
][monitor_offset
].connectionid
.u
.id
;
141 static ssize_t
id_show(struct device
*dev
, struct device_attribute
*dev_attr
,
144 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
146 if (!hv_dev
->channel
)
148 return sprintf(buf
, "%d\n", hv_dev
->channel
->offermsg
.child_relid
);
150 static DEVICE_ATTR_RO(id
);
152 static ssize_t
state_show(struct device
*dev
, struct device_attribute
*dev_attr
,
155 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
157 if (!hv_dev
->channel
)
159 return sprintf(buf
, "%d\n", hv_dev
->channel
->state
);
161 static DEVICE_ATTR_RO(state
);
163 static ssize_t
monitor_id_show(struct device
*dev
,
164 struct device_attribute
*dev_attr
, char *buf
)
166 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
168 if (!hv_dev
->channel
)
170 return sprintf(buf
, "%d\n", hv_dev
->channel
->offermsg
.monitorid
);
172 static DEVICE_ATTR_RO(monitor_id
);
174 static ssize_t
class_id_show(struct device
*dev
,
175 struct device_attribute
*dev_attr
, char *buf
)
177 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
179 if (!hv_dev
->channel
)
181 return sprintf(buf
, "{%pUl}\n",
182 hv_dev
->channel
->offermsg
.offer
.if_type
.b
);
184 static DEVICE_ATTR_RO(class_id
);
186 static ssize_t
device_id_show(struct device
*dev
,
187 struct device_attribute
*dev_attr
, char *buf
)
189 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
191 if (!hv_dev
->channel
)
193 return sprintf(buf
, "{%pUl}\n",
194 hv_dev
->channel
->offermsg
.offer
.if_instance
.b
);
196 static DEVICE_ATTR_RO(device_id
);
198 static ssize_t
modalias_show(struct device
*dev
,
199 struct device_attribute
*dev_attr
, char *buf
)
201 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
202 char alias_name
[VMBUS_ALIAS_LEN
+ 1];
204 print_alias_name(hv_dev
, alias_name
);
205 return sprintf(buf
, "vmbus:%s\n", alias_name
);
207 static DEVICE_ATTR_RO(modalias
);
209 static ssize_t
server_monitor_pending_show(struct device
*dev
,
210 struct device_attribute
*dev_attr
,
213 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
215 if (!hv_dev
->channel
)
217 return sprintf(buf
, "%d\n",
218 channel_pending(hv_dev
->channel
,
219 vmbus_connection
.monitor_pages
[1]));
221 static DEVICE_ATTR_RO(server_monitor_pending
);
223 static ssize_t
client_monitor_pending_show(struct device
*dev
,
224 struct device_attribute
*dev_attr
,
227 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
229 if (!hv_dev
->channel
)
231 return sprintf(buf
, "%d\n",
232 channel_pending(hv_dev
->channel
,
233 vmbus_connection
.monitor_pages
[1]));
235 static DEVICE_ATTR_RO(client_monitor_pending
);
237 static ssize_t
server_monitor_latency_show(struct device
*dev
,
238 struct device_attribute
*dev_attr
,
241 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
243 if (!hv_dev
->channel
)
245 return sprintf(buf
, "%d\n",
246 channel_latency(hv_dev
->channel
,
247 vmbus_connection
.monitor_pages
[0]));
249 static DEVICE_ATTR_RO(server_monitor_latency
);
251 static ssize_t
client_monitor_latency_show(struct device
*dev
,
252 struct device_attribute
*dev_attr
,
255 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
257 if (!hv_dev
->channel
)
259 return sprintf(buf
, "%d\n",
260 channel_latency(hv_dev
->channel
,
261 vmbus_connection
.monitor_pages
[1]));
263 static DEVICE_ATTR_RO(client_monitor_latency
);
265 static ssize_t
server_monitor_conn_id_show(struct device
*dev
,
266 struct device_attribute
*dev_attr
,
269 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
271 if (!hv_dev
->channel
)
273 return sprintf(buf
, "%d\n",
274 channel_conn_id(hv_dev
->channel
,
275 vmbus_connection
.monitor_pages
[0]));
277 static DEVICE_ATTR_RO(server_monitor_conn_id
);
279 static ssize_t
client_monitor_conn_id_show(struct device
*dev
,
280 struct device_attribute
*dev_attr
,
283 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
285 if (!hv_dev
->channel
)
287 return sprintf(buf
, "%d\n",
288 channel_conn_id(hv_dev
->channel
,
289 vmbus_connection
.monitor_pages
[1]));
291 static DEVICE_ATTR_RO(client_monitor_conn_id
);
293 static ssize_t
out_intr_mask_show(struct device
*dev
,
294 struct device_attribute
*dev_attr
, char *buf
)
296 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
297 struct hv_ring_buffer_debug_info outbound
;
299 if (!hv_dev
->channel
)
301 hv_ringbuffer_get_debuginfo(&hv_dev
->channel
->outbound
, &outbound
);
302 return sprintf(buf
, "%d\n", outbound
.current_interrupt_mask
);
304 static DEVICE_ATTR_RO(out_intr_mask
);
306 static ssize_t
out_read_index_show(struct device
*dev
,
307 struct device_attribute
*dev_attr
, char *buf
)
309 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
310 struct hv_ring_buffer_debug_info outbound
;
312 if (!hv_dev
->channel
)
314 hv_ringbuffer_get_debuginfo(&hv_dev
->channel
->outbound
, &outbound
);
315 return sprintf(buf
, "%d\n", outbound
.current_read_index
);
317 static DEVICE_ATTR_RO(out_read_index
);
319 static ssize_t
out_write_index_show(struct device
*dev
,
320 struct device_attribute
*dev_attr
,
323 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
324 struct hv_ring_buffer_debug_info outbound
;
326 if (!hv_dev
->channel
)
328 hv_ringbuffer_get_debuginfo(&hv_dev
->channel
->outbound
, &outbound
);
329 return sprintf(buf
, "%d\n", outbound
.current_write_index
);
331 static DEVICE_ATTR_RO(out_write_index
);
333 static ssize_t
out_read_bytes_avail_show(struct device
*dev
,
334 struct device_attribute
*dev_attr
,
337 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
338 struct hv_ring_buffer_debug_info outbound
;
340 if (!hv_dev
->channel
)
342 hv_ringbuffer_get_debuginfo(&hv_dev
->channel
->outbound
, &outbound
);
343 return sprintf(buf
, "%d\n", outbound
.bytes_avail_toread
);
345 static DEVICE_ATTR_RO(out_read_bytes_avail
);
347 static ssize_t
out_write_bytes_avail_show(struct device
*dev
,
348 struct device_attribute
*dev_attr
,
351 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
352 struct hv_ring_buffer_debug_info outbound
;
354 if (!hv_dev
->channel
)
356 hv_ringbuffer_get_debuginfo(&hv_dev
->channel
->outbound
, &outbound
);
357 return sprintf(buf
, "%d\n", outbound
.bytes_avail_towrite
);
359 static DEVICE_ATTR_RO(out_write_bytes_avail
);
361 static ssize_t
in_intr_mask_show(struct device
*dev
,
362 struct device_attribute
*dev_attr
, char *buf
)
364 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
365 struct hv_ring_buffer_debug_info inbound
;
367 if (!hv_dev
->channel
)
369 hv_ringbuffer_get_debuginfo(&hv_dev
->channel
->inbound
, &inbound
);
370 return sprintf(buf
, "%d\n", inbound
.current_interrupt_mask
);
372 static DEVICE_ATTR_RO(in_intr_mask
);
374 static ssize_t
in_read_index_show(struct device
*dev
,
375 struct device_attribute
*dev_attr
, char *buf
)
377 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
378 struct hv_ring_buffer_debug_info inbound
;
380 if (!hv_dev
->channel
)
382 hv_ringbuffer_get_debuginfo(&hv_dev
->channel
->inbound
, &inbound
);
383 return sprintf(buf
, "%d\n", inbound
.current_read_index
);
385 static DEVICE_ATTR_RO(in_read_index
);
387 static ssize_t
in_write_index_show(struct device
*dev
,
388 struct device_attribute
*dev_attr
, char *buf
)
390 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
391 struct hv_ring_buffer_debug_info inbound
;
393 if (!hv_dev
->channel
)
395 hv_ringbuffer_get_debuginfo(&hv_dev
->channel
->inbound
, &inbound
);
396 return sprintf(buf
, "%d\n", inbound
.current_write_index
);
398 static DEVICE_ATTR_RO(in_write_index
);
400 static ssize_t
in_read_bytes_avail_show(struct device
*dev
,
401 struct device_attribute
*dev_attr
,
404 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
405 struct hv_ring_buffer_debug_info inbound
;
407 if (!hv_dev
->channel
)
409 hv_ringbuffer_get_debuginfo(&hv_dev
->channel
->inbound
, &inbound
);
410 return sprintf(buf
, "%d\n", inbound
.bytes_avail_toread
);
412 static DEVICE_ATTR_RO(in_read_bytes_avail
);
414 static ssize_t
in_write_bytes_avail_show(struct device
*dev
,
415 struct device_attribute
*dev_attr
,
418 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
419 struct hv_ring_buffer_debug_info inbound
;
421 if (!hv_dev
->channel
)
423 hv_ringbuffer_get_debuginfo(&hv_dev
->channel
->inbound
, &inbound
);
424 return sprintf(buf
, "%d\n", inbound
.bytes_avail_towrite
);
426 static DEVICE_ATTR_RO(in_write_bytes_avail
);
428 static ssize_t
channel_vp_mapping_show(struct device
*dev
,
429 struct device_attribute
*dev_attr
,
432 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
433 struct vmbus_channel
*channel
= hv_dev
->channel
, *cur_sc
;
435 int buf_size
= PAGE_SIZE
, n_written
, tot_written
;
436 struct list_head
*cur
;
441 tot_written
= snprintf(buf
, buf_size
, "%u:%u\n",
442 channel
->offermsg
.child_relid
, channel
->target_cpu
);
444 spin_lock_irqsave(&channel
->lock
, flags
);
446 list_for_each(cur
, &channel
->sc_list
) {
447 if (tot_written
>= buf_size
- 1)
450 cur_sc
= list_entry(cur
, struct vmbus_channel
, sc_list
);
451 n_written
= scnprintf(buf
+ tot_written
,
452 buf_size
- tot_written
,
454 cur_sc
->offermsg
.child_relid
,
456 tot_written
+= n_written
;
459 spin_unlock_irqrestore(&channel
->lock
, flags
);
463 static DEVICE_ATTR_RO(channel_vp_mapping
);
465 static ssize_t
vendor_show(struct device
*dev
,
466 struct device_attribute
*dev_attr
,
469 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
470 return sprintf(buf
, "0x%x\n", hv_dev
->vendor_id
);
472 static DEVICE_ATTR_RO(vendor
);
474 static ssize_t
device_show(struct device
*dev
,
475 struct device_attribute
*dev_attr
,
478 struct hv_device
*hv_dev
= device_to_hv_device(dev
);
479 return sprintf(buf
, "0x%x\n", hv_dev
->device_id
);
481 static DEVICE_ATTR_RO(device
);
483 /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */
484 static struct attribute
*vmbus_dev_attrs
[] = {
486 &dev_attr_state
.attr
,
487 &dev_attr_monitor_id
.attr
,
488 &dev_attr_class_id
.attr
,
489 &dev_attr_device_id
.attr
,
490 &dev_attr_modalias
.attr
,
491 &dev_attr_server_monitor_pending
.attr
,
492 &dev_attr_client_monitor_pending
.attr
,
493 &dev_attr_server_monitor_latency
.attr
,
494 &dev_attr_client_monitor_latency
.attr
,
495 &dev_attr_server_monitor_conn_id
.attr
,
496 &dev_attr_client_monitor_conn_id
.attr
,
497 &dev_attr_out_intr_mask
.attr
,
498 &dev_attr_out_read_index
.attr
,
499 &dev_attr_out_write_index
.attr
,
500 &dev_attr_out_read_bytes_avail
.attr
,
501 &dev_attr_out_write_bytes_avail
.attr
,
502 &dev_attr_in_intr_mask
.attr
,
503 &dev_attr_in_read_index
.attr
,
504 &dev_attr_in_write_index
.attr
,
505 &dev_attr_in_read_bytes_avail
.attr
,
506 &dev_attr_in_write_bytes_avail
.attr
,
507 &dev_attr_channel_vp_mapping
.attr
,
508 &dev_attr_vendor
.attr
,
509 &dev_attr_device
.attr
,
512 ATTRIBUTE_GROUPS(vmbus_dev
);
515 * vmbus_uevent - add uevent for our device
517 * This routine is invoked when a device is added or removed on the vmbus to
518 * generate a uevent to udev in the userspace. The udev will then look at its
519 * rule and the uevent generated here to load the appropriate driver
521 * The alias string will be of the form vmbus:guid where guid is the string
522 * representation of the device guid (each byte of the guid will be
523 * represented with two hex characters.
525 static int vmbus_uevent(struct device
*device
, struct kobj_uevent_env
*env
)
527 struct hv_device
*dev
= device_to_hv_device(device
);
529 char alias_name
[VMBUS_ALIAS_LEN
+ 1];
531 print_alias_name(dev
, alias_name
);
532 ret
= add_uevent_var(env
, "MODALIAS=vmbus:%s", alias_name
);
536 static const uuid_le null_guid
;
538 static inline bool is_null_guid(const uuid_le
*guid
)
540 if (uuid_le_cmp(*guid
, null_guid
))
546 * Return a matching hv_vmbus_device_id pointer.
547 * If there is no match, return NULL.
549 static const struct hv_vmbus_device_id
*hv_vmbus_get_id(struct hv_driver
*drv
,
552 const struct hv_vmbus_device_id
*id
= NULL
;
553 struct vmbus_dynid
*dynid
;
555 /* Look at the dynamic ids first, before the static ones */
556 spin_lock(&drv
->dynids
.lock
);
557 list_for_each_entry(dynid
, &drv
->dynids
.list
, node
) {
558 if (!uuid_le_cmp(dynid
->id
.guid
, *guid
)) {
563 spin_unlock(&drv
->dynids
.lock
);
570 return NULL
; /* empty device table */
572 for (; !is_null_guid(&id
->guid
); id
++)
573 if (!uuid_le_cmp(id
->guid
, *guid
))
579 /* vmbus_add_dynid - add a new device ID to this driver and re-probe devices */
580 static int vmbus_add_dynid(struct hv_driver
*drv
, uuid_le
*guid
)
582 struct vmbus_dynid
*dynid
;
584 dynid
= kzalloc(sizeof(*dynid
), GFP_KERNEL
);
588 dynid
->id
.guid
= *guid
;
590 spin_lock(&drv
->dynids
.lock
);
591 list_add_tail(&dynid
->node
, &drv
->dynids
.list
);
592 spin_unlock(&drv
->dynids
.lock
);
594 return driver_attach(&drv
->driver
);
597 static void vmbus_free_dynids(struct hv_driver
*drv
)
599 struct vmbus_dynid
*dynid
, *n
;
601 spin_lock(&drv
->dynids
.lock
);
602 list_for_each_entry_safe(dynid
, n
, &drv
->dynids
.list
, node
) {
603 list_del(&dynid
->node
);
606 spin_unlock(&drv
->dynids
.lock
);
609 /* Parse string of form: 1b4e28ba-2fa1-11d2-883f-b9a761bde3f */
610 static int get_uuid_le(const char *str
, uuid_le
*uu
)
615 if (strlen(str
) < 37)
618 for (i
= 0; i
< 36; i
++) {
620 case 8: case 13: case 18: case 23:
625 if (!isxdigit(str
[i
]))
630 /* unparse little endian output byte order */
632 "%2x%2x%2x%2x-%2x%2x-%2x%2x-%2x%2x-%2x%2x%2x%2x%2x%2x",
633 &b
[3], &b
[2], &b
[1], &b
[0],
634 &b
[5], &b
[4], &b
[7], &b
[6], &b
[8], &b
[9],
635 &b
[10], &b
[11], &b
[12], &b
[13], &b
[14], &b
[15]) != 16)
638 for (i
= 0; i
< 16; i
++)
644 * store_new_id - sysfs frontend to vmbus_add_dynid()
646 * Allow GUIDs to be added to an existing driver via sysfs.
648 static ssize_t
new_id_store(struct device_driver
*driver
, const char *buf
,
651 struct hv_driver
*drv
= drv_to_hv_drv(driver
);
652 uuid_le guid
= NULL_UUID_LE
;
655 if (get_uuid_le(buf
, &guid
) != 0)
658 if (hv_vmbus_get_id(drv
, &guid
))
661 retval
= vmbus_add_dynid(drv
, &guid
);
666 static DRIVER_ATTR_WO(new_id
);
669 * store_remove_id - remove a PCI device ID from this driver
671 * Removes a dynamic pci device ID to this driver.
673 static ssize_t
remove_id_store(struct device_driver
*driver
, const char *buf
,
676 struct hv_driver
*drv
= drv_to_hv_drv(driver
);
677 struct vmbus_dynid
*dynid
, *n
;
678 uuid_le guid
= NULL_UUID_LE
;
679 size_t retval
= -ENODEV
;
681 if (get_uuid_le(buf
, &guid
))
684 spin_lock(&drv
->dynids
.lock
);
685 list_for_each_entry_safe(dynid
, n
, &drv
->dynids
.list
, node
) {
686 struct hv_vmbus_device_id
*id
= &dynid
->id
;
688 if (!uuid_le_cmp(id
->guid
, guid
)) {
689 list_del(&dynid
->node
);
695 spin_unlock(&drv
->dynids
.lock
);
699 static DRIVER_ATTR_WO(remove_id
);
701 static struct attribute
*vmbus_drv_attrs
[] = {
702 &driver_attr_new_id
.attr
,
703 &driver_attr_remove_id
.attr
,
706 ATTRIBUTE_GROUPS(vmbus_drv
);
710 * vmbus_match - Attempt to match the specified device to the specified driver
712 static int vmbus_match(struct device
*device
, struct device_driver
*driver
)
714 struct hv_driver
*drv
= drv_to_hv_drv(driver
);
715 struct hv_device
*hv_dev
= device_to_hv_device(device
);
717 /* The hv_sock driver handles all hv_sock offers. */
718 if (is_hvsock_channel(hv_dev
->channel
))
721 if (hv_vmbus_get_id(drv
, &hv_dev
->dev_type
))
728 * vmbus_probe - Add the new vmbus's child device
730 static int vmbus_probe(struct device
*child_device
)
733 struct hv_driver
*drv
=
734 drv_to_hv_drv(child_device
->driver
);
735 struct hv_device
*dev
= device_to_hv_device(child_device
);
736 const struct hv_vmbus_device_id
*dev_id
;
738 dev_id
= hv_vmbus_get_id(drv
, &dev
->dev_type
);
740 ret
= drv
->probe(dev
, dev_id
);
742 pr_err("probe failed for device %s (%d)\n",
743 dev_name(child_device
), ret
);
746 pr_err("probe not set for driver %s\n",
747 dev_name(child_device
));
754 * vmbus_remove - Remove a vmbus device
756 static int vmbus_remove(struct device
*child_device
)
758 struct hv_driver
*drv
;
759 struct hv_device
*dev
= device_to_hv_device(child_device
);
761 if (child_device
->driver
) {
762 drv
= drv_to_hv_drv(child_device
->driver
);
772 * vmbus_shutdown - Shutdown a vmbus device
774 static void vmbus_shutdown(struct device
*child_device
)
776 struct hv_driver
*drv
;
777 struct hv_device
*dev
= device_to_hv_device(child_device
);
780 /* The device may not be attached yet */
781 if (!child_device
->driver
)
784 drv
= drv_to_hv_drv(child_device
->driver
);
794 * vmbus_device_release - Final callback release of the vmbus child device
796 static void vmbus_device_release(struct device
*device
)
798 struct hv_device
*hv_dev
= device_to_hv_device(device
);
799 struct vmbus_channel
*channel
= hv_dev
->channel
;
801 hv_process_channel_removal(channel
,
802 channel
->offermsg
.child_relid
);
807 /* The one and only one */
808 static struct bus_type hv_bus
= {
810 .match
= vmbus_match
,
811 .shutdown
= vmbus_shutdown
,
812 .remove
= vmbus_remove
,
813 .probe
= vmbus_probe
,
814 .uevent
= vmbus_uevent
,
815 .dev_groups
= vmbus_dev_groups
,
816 .drv_groups
= vmbus_drv_groups
,
819 struct onmessage_work_context
{
820 struct work_struct work
;
821 struct hv_message msg
;
824 static void vmbus_onmessage_work(struct work_struct
*work
)
826 struct onmessage_work_context
*ctx
;
828 /* Do not process messages if we're in DISCONNECTED state */
829 if (vmbus_connection
.conn_state
== DISCONNECTED
)
832 ctx
= container_of(work
, struct onmessage_work_context
,
834 vmbus_onmessage(&ctx
->msg
);
838 static void hv_process_timer_expiration(struct hv_message
*msg
, int cpu
)
840 struct clock_event_device
*dev
= hv_context
.clk_evt
[cpu
];
842 if (dev
->event_handler
)
843 dev
->event_handler(dev
);
845 vmbus_signal_eom(msg
, HVMSG_TIMER_EXPIRED
);
848 void vmbus_on_msg_dpc(unsigned long data
)
850 int cpu
= smp_processor_id();
851 void *page_addr
= hv_context
.synic_message_page
[cpu
];
852 struct hv_message
*msg
= (struct hv_message
*)page_addr
+
854 struct vmbus_channel_message_header
*hdr
;
855 struct vmbus_channel_message_table_entry
*entry
;
856 struct onmessage_work_context
*ctx
;
857 u32 message_type
= msg
->header
.message_type
;
859 if (message_type
== HVMSG_NONE
)
863 hdr
= (struct vmbus_channel_message_header
*)msg
->u
.payload
;
865 if (hdr
->msgtype
>= CHANNELMSG_COUNT
) {
866 WARN_ONCE(1, "unknown msgtype=%d\n", hdr
->msgtype
);
870 entry
= &channel_message_table
[hdr
->msgtype
];
871 if (entry
->handler_type
== VMHT_BLOCKING
) {
872 ctx
= kmalloc(sizeof(*ctx
), GFP_ATOMIC
);
876 INIT_WORK(&ctx
->work
, vmbus_onmessage_work
);
877 memcpy(&ctx
->msg
, msg
, sizeof(*msg
));
879 queue_work(vmbus_connection
.work_queue
, &ctx
->work
);
881 entry
->message_handler(hdr
);
884 vmbus_signal_eom(msg
, message_type
);
887 static void vmbus_isr(void)
889 int cpu
= smp_processor_id();
891 struct hv_message
*msg
;
892 union hv_synic_event_flags
*event
;
893 bool handled
= false;
895 page_addr
= hv_context
.synic_event_page
[cpu
];
896 if (page_addr
== NULL
)
899 event
= (union hv_synic_event_flags
*)page_addr
+
902 * Check for events before checking for messages. This is the order
903 * in which events and messages are checked in Windows guests on
904 * Hyper-V, and the Windows team suggested we do the same.
907 if ((vmbus_proto_version
== VERSION_WS2008
) ||
908 (vmbus_proto_version
== VERSION_WIN7
)) {
910 /* Since we are a child, we only need to check bit 0 */
911 if (sync_test_and_clear_bit(0,
912 (unsigned long *) &event
->flags32
[0])) {
917 * Our host is win8 or above. The signaling mechanism
918 * has changed and we can directly look at the event page.
919 * If bit n is set then we have an interrup on the channel
926 tasklet_schedule(hv_context
.event_dpc
[cpu
]);
929 page_addr
= hv_context
.synic_message_page
[cpu
];
930 msg
= (struct hv_message
*)page_addr
+ VMBUS_MESSAGE_SINT
;
932 /* Check if there are actual msgs to be processed */
933 if (msg
->header
.message_type
!= HVMSG_NONE
) {
934 if (msg
->header
.message_type
== HVMSG_TIMER_EXPIRED
)
935 hv_process_timer_expiration(msg
, cpu
);
937 tasklet_schedule(hv_context
.msg_dpc
[cpu
]);
940 add_interrupt_randomness(HYPERVISOR_CALLBACK_VECTOR
, 0);
945 * vmbus_bus_init -Main vmbus driver initialization routine.
948 * - initialize the vmbus driver context
949 * - invoke the vmbus hv main init routine
950 * - retrieve the channel offers
952 static int vmbus_bus_init(void)
956 /* Hypervisor initialization...setup hypercall page..etc */
959 pr_err("Unable to initialize the hypervisor - 0x%x\n", ret
);
963 ret
= bus_register(&hv_bus
);
967 hv_setup_vmbus_irq(vmbus_isr
);
969 ret
= hv_synic_alloc();
973 * Initialize the per-cpu interrupt state and
974 * connect to the host.
976 ret
= cpuhp_setup_state(CPUHP_AP_ONLINE_DYN
, "x86/hyperv:online",
977 hv_synic_init
, hv_synic_cleanup
);
980 hyperv_cpuhp_online
= ret
;
982 ret
= vmbus_connect();
987 * Only register if the crash MSRs are available
989 if (ms_hyperv
.misc_features
& HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE
) {
990 register_die_notifier(&hyperv_die_block
);
991 atomic_notifier_chain_register(&panic_notifier_list
,
992 &hyperv_panic_block
);
995 vmbus_request_offers();
1000 cpuhp_remove_state(hyperv_cpuhp_online
);
1003 hv_remove_vmbus_irq();
1005 bus_unregister(&hv_bus
);
1011 * __vmbus_child_driver_register() - Register a vmbus's driver
1012 * @hv_driver: Pointer to driver structure you want to register
1013 * @owner: owner module of the drv
1014 * @mod_name: module name string
1016 * Registers the given driver with Linux through the 'driver_register()' call
1017 * and sets up the hyper-v vmbus handling for this driver.
1018 * It will return the state of the 'driver_register()' call.
1021 int __vmbus_driver_register(struct hv_driver
*hv_driver
, struct module
*owner
, const char *mod_name
)
1025 pr_info("registering driver %s\n", hv_driver
->name
);
1027 ret
= vmbus_exists();
1031 hv_driver
->driver
.name
= hv_driver
->name
;
1032 hv_driver
->driver
.owner
= owner
;
1033 hv_driver
->driver
.mod_name
= mod_name
;
1034 hv_driver
->driver
.bus
= &hv_bus
;
1036 spin_lock_init(&hv_driver
->dynids
.lock
);
1037 INIT_LIST_HEAD(&hv_driver
->dynids
.list
);
1039 ret
= driver_register(&hv_driver
->driver
);
1043 EXPORT_SYMBOL_GPL(__vmbus_driver_register
);
1046 * vmbus_driver_unregister() - Unregister a vmbus's driver
1047 * @hv_driver: Pointer to driver structure you want to
1050 * Un-register the given driver that was previous registered with a call to
1051 * vmbus_driver_register()
1053 void vmbus_driver_unregister(struct hv_driver
*hv_driver
)
1055 pr_info("unregistering driver %s\n", hv_driver
->name
);
1057 if (!vmbus_exists()) {
1058 driver_unregister(&hv_driver
->driver
);
1059 vmbus_free_dynids(hv_driver
);
1062 EXPORT_SYMBOL_GPL(vmbus_driver_unregister
);
1065 * vmbus_device_create - Creates and registers a new child device
1068 struct hv_device
*vmbus_device_create(const uuid_le
*type
,
1069 const uuid_le
*instance
,
1070 struct vmbus_channel
*channel
)
1072 struct hv_device
*child_device_obj
;
1074 child_device_obj
= kzalloc(sizeof(struct hv_device
), GFP_KERNEL
);
1075 if (!child_device_obj
) {
1076 pr_err("Unable to allocate device object for child device\n");
1080 child_device_obj
->channel
= channel
;
1081 memcpy(&child_device_obj
->dev_type
, type
, sizeof(uuid_le
));
1082 memcpy(&child_device_obj
->dev_instance
, instance
,
1084 child_device_obj
->vendor_id
= 0x1414; /* MSFT vendor ID */
1087 return child_device_obj
;
1091 * vmbus_device_register - Register the child device
1093 int vmbus_device_register(struct hv_device
*child_device_obj
)
1097 dev_set_name(&child_device_obj
->device
, "%pUl",
1098 child_device_obj
->channel
->offermsg
.offer
.if_instance
.b
);
1100 child_device_obj
->device
.bus
= &hv_bus
;
1101 child_device_obj
->device
.parent
= &hv_acpi_dev
->dev
;
1102 child_device_obj
->device
.release
= vmbus_device_release
;
1105 * Register with the LDM. This will kick off the driver/device
1106 * binding...which will eventually call vmbus_match() and vmbus_probe()
1108 ret
= device_register(&child_device_obj
->device
);
1111 pr_err("Unable to register child device\n");
1113 pr_debug("child device %s registered\n",
1114 dev_name(&child_device_obj
->device
));
1120 * vmbus_device_unregister - Remove the specified child device
1123 void vmbus_device_unregister(struct hv_device
*device_obj
)
1125 pr_debug("child device %s unregistered\n",
1126 dev_name(&device_obj
->device
));
1129 * Kick off the process of unregistering the device.
1130 * This will call vmbus_remove() and eventually vmbus_device_release()
1132 device_unregister(&device_obj
->device
);
1137 * VMBUS is an acpi enumerated device. Get the information we
1140 #define VTPM_BASE_ADDRESS 0xfed40000
1141 static acpi_status
vmbus_walk_resources(struct acpi_resource
*res
, void *ctx
)
1143 resource_size_t start
= 0;
1144 resource_size_t end
= 0;
1145 struct resource
*new_res
;
1146 struct resource
**old_res
= &hyperv_mmio
;
1147 struct resource
**prev_res
= NULL
;
1149 switch (res
->type
) {
1152 * "Address" descriptors are for bus windows. Ignore
1153 * "memory" descriptors, which are for registers on
1156 case ACPI_RESOURCE_TYPE_ADDRESS32
:
1157 start
= res
->data
.address32
.address
.minimum
;
1158 end
= res
->data
.address32
.address
.maximum
;
1161 case ACPI_RESOURCE_TYPE_ADDRESS64
:
1162 start
= res
->data
.address64
.address
.minimum
;
1163 end
= res
->data
.address64
.address
.maximum
;
1167 /* Unused resource type */
1172 * Ignore ranges that are below 1MB, as they're not
1173 * necessary or useful here.
1178 new_res
= kzalloc(sizeof(*new_res
), GFP_ATOMIC
);
1180 return AE_NO_MEMORY
;
1182 /* If this range overlaps the virtual TPM, truncate it. */
1183 if (end
> VTPM_BASE_ADDRESS
&& start
< VTPM_BASE_ADDRESS
)
1184 end
= VTPM_BASE_ADDRESS
;
1186 new_res
->name
= "hyperv mmio";
1187 new_res
->flags
= IORESOURCE_MEM
;
1188 new_res
->start
= start
;
1192 * If two ranges are adjacent, merge them.
1200 if (((*old_res
)->end
+ 1) == new_res
->start
) {
1201 (*old_res
)->end
= new_res
->end
;
1206 if ((*old_res
)->start
== new_res
->end
+ 1) {
1207 (*old_res
)->start
= new_res
->start
;
1212 if ((*old_res
)->start
> new_res
->end
) {
1213 new_res
->sibling
= *old_res
;
1215 (*prev_res
)->sibling
= new_res
;
1221 old_res
= &(*old_res
)->sibling
;
1228 static int vmbus_acpi_remove(struct acpi_device
*device
)
1230 struct resource
*cur_res
;
1231 struct resource
*next_res
;
1235 __release_region(hyperv_mmio
, fb_mmio
->start
,
1236 resource_size(fb_mmio
));
1240 for (cur_res
= hyperv_mmio
; cur_res
; cur_res
= next_res
) {
1241 next_res
= cur_res
->sibling
;
1249 static void vmbus_reserve_fb(void)
1253 * Make a claim for the frame buffer in the resource tree under the
1254 * first node, which will be the one below 4GB. The length seems to
1255 * be underreported, particularly in a Generation 1 VM. So start out
1256 * reserving a larger area and make it smaller until it succeeds.
1259 if (screen_info
.lfb_base
) {
1260 if (efi_enabled(EFI_BOOT
))
1261 size
= max_t(__u32
, screen_info
.lfb_size
, 0x800000);
1263 size
= max_t(__u32
, screen_info
.lfb_size
, 0x4000000);
1265 for (; !fb_mmio
&& (size
>= 0x100000); size
>>= 1) {
1266 fb_mmio
= __request_region(hyperv_mmio
,
1267 screen_info
.lfb_base
, size
,
1274 * vmbus_allocate_mmio() - Pick a memory-mapped I/O range.
1275 * @new: If successful, supplied a pointer to the
1276 * allocated MMIO space.
1277 * @device_obj: Identifies the caller
1278 * @min: Minimum guest physical address of the
1280 * @max: Maximum guest physical address
1281 * @size: Size of the range to be allocated
1282 * @align: Alignment of the range to be allocated
1283 * @fb_overlap_ok: Whether this allocation can be allowed
1284 * to overlap the video frame buffer.
1286 * This function walks the resources granted to VMBus by the
1287 * _CRS object in the ACPI namespace underneath the parent
1288 * "bridge" whether that's a root PCI bus in the Generation 1
1289 * case or a Module Device in the Generation 2 case. It then
1290 * attempts to allocate from the global MMIO pool in a way that
1291 * matches the constraints supplied in these parameters and by
1294 * Return: 0 on success, -errno on failure
1296 int vmbus_allocate_mmio(struct resource
**new, struct hv_device
*device_obj
,
1297 resource_size_t min
, resource_size_t max
,
1298 resource_size_t size
, resource_size_t align
,
1301 struct resource
*iter
, *shadow
;
1302 resource_size_t range_min
, range_max
, start
;
1303 const char *dev_n
= dev_name(&device_obj
->device
);
1307 down(&hyperv_mmio_lock
);
1310 * If overlaps with frame buffers are allowed, then first attempt to
1311 * make the allocation from within the reserved region. Because it
1312 * is already reserved, no shadow allocation is necessary.
1314 if (fb_overlap_ok
&& fb_mmio
&& !(min
> fb_mmio
->end
) &&
1315 !(max
< fb_mmio
->start
)) {
1317 range_min
= fb_mmio
->start
;
1318 range_max
= fb_mmio
->end
;
1319 start
= (range_min
+ align
- 1) & ~(align
- 1);
1320 for (; start
+ size
- 1 <= range_max
; start
+= align
) {
1321 *new = request_mem_region_exclusive(start
, size
, dev_n
);
1329 for (iter
= hyperv_mmio
; iter
; iter
= iter
->sibling
) {
1330 if ((iter
->start
>= max
) || (iter
->end
<= min
))
1333 range_min
= iter
->start
;
1334 range_max
= iter
->end
;
1335 start
= (range_min
+ align
- 1) & ~(align
- 1);
1336 for (; start
+ size
- 1 <= range_max
; start
+= align
) {
1337 shadow
= __request_region(iter
, start
, size
, NULL
,
1342 *new = request_mem_region_exclusive(start
, size
, dev_n
);
1344 shadow
->name
= (char *)*new;
1349 __release_region(iter
, start
, size
);
1354 up(&hyperv_mmio_lock
);
1357 EXPORT_SYMBOL_GPL(vmbus_allocate_mmio
);
1360 * vmbus_free_mmio() - Free a memory-mapped I/O range.
1361 * @start: Base address of region to release.
1362 * @size: Size of the range to be allocated
1364 * This function releases anything requested by
1365 * vmbus_mmio_allocate().
1367 void vmbus_free_mmio(resource_size_t start
, resource_size_t size
)
1369 struct resource
*iter
;
1371 down(&hyperv_mmio_lock
);
1372 for (iter
= hyperv_mmio
; iter
; iter
= iter
->sibling
) {
1373 if ((iter
->start
>= start
+ size
) || (iter
->end
<= start
))
1376 __release_region(iter
, start
, size
);
1378 release_mem_region(start
, size
);
1379 up(&hyperv_mmio_lock
);
1382 EXPORT_SYMBOL_GPL(vmbus_free_mmio
);
1385 * vmbus_cpu_number_to_vp_number() - Map CPU to VP.
1386 * @cpu_number: CPU number in Linux terms
1388 * This function returns the mapping between the Linux processor
1389 * number and the hypervisor's virtual processor number, useful
1390 * in making hypercalls and such that talk about specific
1393 * Return: Virtual processor number in Hyper-V terms
1395 int vmbus_cpu_number_to_vp_number(int cpu_number
)
1397 return hv_context
.vp_index
[cpu_number
];
1399 EXPORT_SYMBOL_GPL(vmbus_cpu_number_to_vp_number
);
1401 static int vmbus_acpi_add(struct acpi_device
*device
)
1404 int ret_val
= -ENODEV
;
1405 struct acpi_device
*ancestor
;
1407 hv_acpi_dev
= device
;
1409 result
= acpi_walk_resources(device
->handle
, METHOD_NAME__CRS
,
1410 vmbus_walk_resources
, NULL
);
1412 if (ACPI_FAILURE(result
))
1415 * Some ancestor of the vmbus acpi device (Gen1 or Gen2
1416 * firmware) is the VMOD that has the mmio ranges. Get that.
1418 for (ancestor
= device
->parent
; ancestor
; ancestor
= ancestor
->parent
) {
1419 result
= acpi_walk_resources(ancestor
->handle
, METHOD_NAME__CRS
,
1420 vmbus_walk_resources
, NULL
);
1422 if (ACPI_FAILURE(result
))
1432 complete(&probe_event
);
1434 vmbus_acpi_remove(device
);
1438 static const struct acpi_device_id vmbus_acpi_device_ids
[] = {
1443 MODULE_DEVICE_TABLE(acpi
, vmbus_acpi_device_ids
);
1445 static struct acpi_driver vmbus_acpi_driver
= {
1447 .ids
= vmbus_acpi_device_ids
,
1449 .add
= vmbus_acpi_add
,
1450 .remove
= vmbus_acpi_remove
,
1454 static void hv_kexec_handler(void)
1456 hv_synic_clockevents_cleanup();
1457 vmbus_initiate_unload(false);
1458 vmbus_connection
.conn_state
= DISCONNECTED
;
1459 /* Make sure conn_state is set as hv_synic_cleanup checks for it */
1461 cpuhp_remove_state(hyperv_cpuhp_online
);
1465 static void hv_crash_handler(struct pt_regs
*regs
)
1467 vmbus_initiate_unload(true);
1469 * In crash handler we can't schedule synic cleanup for all CPUs,
1470 * doing the cleanup for current CPU only. This should be sufficient
1473 vmbus_connection
.conn_state
= DISCONNECTED
;
1474 hv_synic_cleanup(smp_processor_id());
1478 static int __init
hv_acpi_init(void)
1482 if (x86_hyper
!= &x86_hyper_ms_hyperv
)
1485 init_completion(&probe_event
);
1488 * Get ACPI resources first.
1490 ret
= acpi_bus_register_driver(&vmbus_acpi_driver
);
1495 t
= wait_for_completion_timeout(&probe_event
, 5*HZ
);
1501 ret
= vmbus_bus_init();
1505 hv_setup_kexec_handler(hv_kexec_handler
);
1506 hv_setup_crash_handler(hv_crash_handler
);
1511 acpi_bus_unregister_driver(&vmbus_acpi_driver
);
1516 static void __exit
vmbus_exit(void)
1520 hv_remove_kexec_handler();
1521 hv_remove_crash_handler();
1522 vmbus_connection
.conn_state
= DISCONNECTED
;
1523 hv_synic_clockevents_cleanup();
1525 hv_remove_vmbus_irq();
1526 for_each_online_cpu(cpu
)
1527 tasklet_kill(hv_context
.msg_dpc
[cpu
]);
1528 vmbus_free_channels();
1529 if (ms_hyperv
.misc_features
& HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE
) {
1530 unregister_die_notifier(&hyperv_die_block
);
1531 atomic_notifier_chain_unregister(&panic_notifier_list
,
1532 &hyperv_panic_block
);
1534 bus_unregister(&hv_bus
);
1535 for_each_online_cpu(cpu
) {
1536 tasklet_kill(hv_context
.event_dpc
[cpu
]);
1538 cpuhp_remove_state(hyperv_cpuhp_online
);
1540 acpi_bus_unregister_driver(&vmbus_acpi_driver
);
1544 MODULE_LICENSE("GPL");
1546 subsys_initcall(hv_acpi_init
);
1547 module_exit(vmbus_exit
);