3 * Copyright (C) 2010 - 2015 UNISYS CORPORATION
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
13 * NON INFRINGEMENT. See the GNU General Public License for more
17 #include <linux/acpi.h>
18 #include <linux/cdev.h>
19 #include <linux/ctype.h>
22 #include <linux/nls.h>
23 #include <linux/netdevice.h>
24 #include <linux/platform_device.h>
25 #include <linux/uuid.h>
26 #include <linux/crash_dump.h>
28 #include "channel_guid.h"
29 #include "controlvmchannel.h"
30 #include "controlvmcompletionstatus.h"
31 #include "guestlinuxdebug.h"
32 #include "periodic_work.h"
35 #include "visorbus_private.h"
36 #include "vmcallinterface.h"
38 #define CURRENT_FILE_PC VISOR_CHIPSET_PC_visorchipset_main_c
40 #define MAX_NAME_SIZE 128
41 #define MAX_IP_SIZE 50
42 #define MAXOUTSTANDINGCHANNELCOMMAND 256
43 #define POLLJIFFIES_CONTROLVMCHANNEL_FAST 1
44 #define POLLJIFFIES_CONTROLVMCHANNEL_SLOW 100
46 #define MAX_CONTROLVM_PAYLOAD_BYTES (1024*128)
48 #define VISORCHIPSET_MMAP_CONTROLCHANOFFSET 0x00000000
51 #define UNISYS_SPAR_LEAF_ID 0x40000000
53 /* The s-Par leaf ID returns "UnisysSpar64" encoded across ebx, ecx, edx */
54 #define UNISYS_SPAR_ID_EBX 0x73696e55
55 #define UNISYS_SPAR_ID_ECX 0x70537379
56 #define UNISYS_SPAR_ID_EDX 0x34367261
61 static int visorchipset_major;
62 static int visorchipset_visorbusregwait = 1; /* default is on */
63 static int visorchipset_holdchipsetready;
64 static unsigned long controlvm_payload_bytes_buffered;
67 visorchipset_open(struct inode *inode, struct file *file)
69 unsigned minor_number = iminor(inode);
73 file->private_data = NULL;
78 visorchipset_release(struct inode *inode, struct file *file)
83 /* When the controlvm channel is idle for at least MIN_IDLE_SECONDS,
84 * we switch to slow polling mode. As soon as we get a controlvm
85 * message, we switch back to fast polling mode.
87 #define MIN_IDLE_SECONDS 10
88 static unsigned long poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_FAST;
89 static unsigned long most_recent_message_jiffies; /* when we got our last
90 * controlvm message */
91 static int visorbusregistered;
93 #define MAX_CHIPSET_EVENTS 2
94 static u8 chipset_events[MAX_CHIPSET_EVENTS] = { 0, 0 };
96 struct parser_context {
97 unsigned long allocbytes;
98 unsigned long param_bytes;
100 unsigned long bytes_remaining;
105 static struct delayed_work periodic_controlvm_work;
106 static struct workqueue_struct *periodic_controlvm_workqueue;
107 static DEFINE_SEMAPHORE(notifier_lock);
109 static struct cdev file_cdev;
110 static struct visorchannel **file_controlvm_channel;
111 static struct controlvm_message_header g_chipset_msg_hdr;
112 static struct controlvm_message_packet g_devicechangestate_packet;
114 static LIST_HEAD(bus_info_list);
115 static LIST_HEAD(dev_info_list);
117 static struct visorchannel *controlvm_channel;
119 /* Manages the request payload in the controlvm channel */
120 struct visor_controlvm_payload_info {
121 u8 __iomem *ptr; /* pointer to base address of payload pool */
122 u64 offset; /* offset from beginning of controlvm
123 * channel to beginning of payload * pool */
124 u32 bytes; /* number of bytes in payload pool */
127 static struct visor_controlvm_payload_info controlvm_payload_info;
129 /* The following globals are used to handle the scenario where we are unable to
130 * offload the payload from a controlvm message due to memory requirements. In
131 * this scenario, we simply stash the controlvm message, then attempt to
132 * process it again the next time controlvm_periodic_work() runs.
134 static struct controlvm_message controlvm_pending_msg;
135 static bool controlvm_pending_msg_valid;
137 /* This identifies a data buffer that has been received via a controlvm messages
138 * in a remote --> local CONTROLVM_TRANSMIT_FILE conversation.
140 struct putfile_buffer_entry {
141 struct list_head next; /* putfile_buffer_entry list */
142 struct parser_context *parser_ctx; /* points to input data buffer */
145 /* List of struct putfile_request *, via next_putfile_request member.
146 * Each entry in this list identifies an outstanding TRANSMIT_FILE
149 static LIST_HEAD(putfile_request_list);
151 /* This describes a buffer and its current state of transfer (e.g., how many
152 * bytes have already been supplied as putfile data, and how many bytes are
153 * remaining) for a putfile_request.
155 struct putfile_active_buffer {
156 /* a payload from a controlvm message, containing a file data buffer */
157 struct parser_context *parser_ctx;
158 /* points within data area of parser_ctx to next byte of data */
160 /* # bytes left from <pnext> to the end of this data buffer */
161 size_t bytes_remaining;
164 #define PUTFILE_REQUEST_SIG 0x0906101302281211
165 /* This identifies a single remote --> local CONTROLVM_TRANSMIT_FILE
166 * conversation. Structs of this type are dynamically linked into
167 * <Putfile_request_list>.
169 struct putfile_request {
170 u64 sig; /* PUTFILE_REQUEST_SIG */
172 /* header from original TransmitFile request */
173 struct controlvm_message_header controlvm_header;
174 u64 file_request_number; /* from original TransmitFile request */
176 /* link to next struct putfile_request */
177 struct list_head next_putfile_request;
179 /* most-recent sequence number supplied via a controlvm message */
180 u64 data_sequence_number;
182 /* head of putfile_buffer_entry list, which describes the data to be
183 * supplied as putfile data;
184 * - this list is added to when controlvm messages come in that supply
186 * - this list is removed from via the hotplug program that is actually
187 * consuming these buffers to write as file data */
188 struct list_head input_buffer_list;
189 spinlock_t req_list_lock; /* lock for input_buffer_list */
191 /* waiters for input_buffer_list to go non-empty */
192 wait_queue_head_t input_buffer_wq;
194 /* data not yet read within current putfile_buffer_entry */
195 struct putfile_active_buffer active_buf;
197 /* <0 = failed, 0 = in-progress, >0 = successful; */
198 /* note that this must be set with req_list_lock, and if you set <0, */
199 /* it is your responsibility to also free up all of the other objects */
200 /* in this struct (like input_buffer_list, active_buf.parser_ctx) */
201 /* before releasing the lock */
202 int completion_status;
205 struct parahotplug_request {
206 struct list_head list;
208 unsigned long expiration;
209 struct controlvm_message msg;
212 static LIST_HEAD(parahotplug_request_list);
213 static DEFINE_SPINLOCK(parahotplug_request_list_lock); /* lock for above */
214 static void parahotplug_process_list(void);
216 /* Manages the info for a CONTROLVM_DUMP_CAPTURESTATE /
217 * CONTROLVM_REPORTEVENT.
219 static struct visorchipset_busdev_notifiers busdev_notifiers;
221 static void bus_create_response(struct visor_device *p, int response);
222 static void bus_destroy_response(struct visor_device *p, int response);
223 static void device_create_response(struct visor_device *p, int response);
224 static void device_destroy_response(struct visor_device *p, int response);
225 static void device_resume_response(struct visor_device *p, int response);
227 static void visorchipset_device_pause_response(struct visor_device *p,
230 static struct visorchipset_busdev_responders busdev_responders = {
231 .bus_create = bus_create_response,
232 .bus_destroy = bus_destroy_response,
233 .device_create = device_create_response,
234 .device_destroy = device_destroy_response,
235 .device_pause = visorchipset_device_pause_response,
236 .device_resume = device_resume_response,
239 /* info for /dev/visorchipset */
240 static dev_t major_dev = -1; /**< indicates major num for device */
242 /* prototypes for attributes */
243 static ssize_t toolaction_show(struct device *dev,
244 struct device_attribute *attr, char *buf);
245 static ssize_t toolaction_store(struct device *dev,
246 struct device_attribute *attr,
247 const char *buf, size_t count);
248 static DEVICE_ATTR_RW(toolaction);
250 static ssize_t boottotool_show(struct device *dev,
251 struct device_attribute *attr, char *buf);
252 static ssize_t boottotool_store(struct device *dev,
253 struct device_attribute *attr, const char *buf,
255 static DEVICE_ATTR_RW(boottotool);
257 static ssize_t error_show(struct device *dev, struct device_attribute *attr,
259 static ssize_t error_store(struct device *dev, struct device_attribute *attr,
260 const char *buf, size_t count);
261 static DEVICE_ATTR_RW(error);
263 static ssize_t textid_show(struct device *dev, struct device_attribute *attr,
265 static ssize_t textid_store(struct device *dev, struct device_attribute *attr,
266 const char *buf, size_t count);
267 static DEVICE_ATTR_RW(textid);
269 static ssize_t remaining_steps_show(struct device *dev,
270 struct device_attribute *attr, char *buf);
271 static ssize_t remaining_steps_store(struct device *dev,
272 struct device_attribute *attr,
273 const char *buf, size_t count);
274 static DEVICE_ATTR_RW(remaining_steps);
276 static ssize_t chipsetready_store(struct device *dev,
277 struct device_attribute *attr,
278 const char *buf, size_t count);
279 static DEVICE_ATTR_WO(chipsetready);
281 static ssize_t devicedisabled_store(struct device *dev,
282 struct device_attribute *attr,
283 const char *buf, size_t count);
284 static DEVICE_ATTR_WO(devicedisabled);
286 static ssize_t deviceenabled_store(struct device *dev,
287 struct device_attribute *attr,
288 const char *buf, size_t count);
289 static DEVICE_ATTR_WO(deviceenabled);
291 static struct attribute *visorchipset_install_attrs[] = {
292 &dev_attr_toolaction.attr,
293 &dev_attr_boottotool.attr,
294 &dev_attr_error.attr,
295 &dev_attr_textid.attr,
296 &dev_attr_remaining_steps.attr,
300 static struct attribute_group visorchipset_install_group = {
302 .attrs = visorchipset_install_attrs
305 static struct attribute *visorchipset_guest_attrs[] = {
306 &dev_attr_chipsetready.attr,
310 static struct attribute_group visorchipset_guest_group = {
312 .attrs = visorchipset_guest_attrs
315 static struct attribute *visorchipset_parahotplug_attrs[] = {
316 &dev_attr_devicedisabled.attr,
317 &dev_attr_deviceenabled.attr,
321 static struct attribute_group visorchipset_parahotplug_group = {
322 .name = "parahotplug",
323 .attrs = visorchipset_parahotplug_attrs
326 static const struct attribute_group *visorchipset_dev_groups[] = {
327 &visorchipset_install_group,
328 &visorchipset_guest_group,
329 &visorchipset_parahotplug_group,
333 static void visorchipset_dev_release(struct device *dev)
337 /* /sys/devices/platform/visorchipset */
338 static struct platform_device visorchipset_platform_device = {
339 .name = "visorchipset",
341 .dev.groups = visorchipset_dev_groups,
342 .dev.release = visorchipset_dev_release,
345 /* Function prototypes */
346 static void controlvm_respond(struct controlvm_message_header *msg_hdr,
348 static void controlvm_respond_chipset_init(
349 struct controlvm_message_header *msg_hdr, int response,
350 enum ultra_chipset_feature features);
351 static void controlvm_respond_physdev_changestate(
352 struct controlvm_message_header *msg_hdr, int response,
353 struct spar_segment_state state);
356 static void parser_done(struct parser_context *ctx);
358 static struct parser_context *
359 parser_init_byte_stream(u64 addr, u32 bytes, bool local, bool *retry)
361 int allocbytes = sizeof(struct parser_context) + bytes;
362 struct parser_context *rc = NULL;
363 struct parser_context *ctx = NULL;
369 * alloc an 0 extra byte to ensure payload is
373 if ((controlvm_payload_bytes_buffered + bytes)
374 > MAX_CONTROLVM_PAYLOAD_BYTES) {
380 ctx = kzalloc(allocbytes, GFP_KERNEL|__GFP_NORETRY);
388 ctx->allocbytes = allocbytes;
389 ctx->param_bytes = bytes;
391 ctx->bytes_remaining = 0;
392 ctx->byte_stream = false;
396 if (addr > virt_to_phys(high_memory - 1)) {
400 p = __va((unsigned long) (addr));
401 memcpy(ctx->data, p, bytes);
403 void __iomem *mapping;
405 if (!request_mem_region(addr, bytes, "visorchipset")) {
410 mapping = ioremap_cache(addr, bytes);
412 release_mem_region(addr, bytes);
416 memcpy_fromio(ctx->data, mapping, bytes);
417 release_mem_region(addr, bytes);
420 ctx->byte_stream = true;
424 controlvm_payload_bytes_buffered += ctx->param_bytes;
435 parser_id_get(struct parser_context *ctx)
437 struct spar_controlvm_parameters_header *phdr = NULL;
441 phdr = (struct spar_controlvm_parameters_header *)(ctx->data);
445 /** Describes the state from the perspective of which controlvm messages have
446 * been received for a bus or device.
449 enum PARSER_WHICH_STRING {
450 PARSERSTRING_INITIATOR,
452 PARSERSTRING_CONNECTION,
453 PARSERSTRING_NAME, /* TODO: only PARSERSTRING_NAME is used ? */
457 parser_param_start(struct parser_context *ctx,
458 enum PARSER_WHICH_STRING which_string)
460 struct spar_controlvm_parameters_header *phdr = NULL;
464 phdr = (struct spar_controlvm_parameters_header *)(ctx->data);
465 switch (which_string) {
466 case PARSERSTRING_INITIATOR:
467 ctx->curr = ctx->data + phdr->initiator_offset;
468 ctx->bytes_remaining = phdr->initiator_length;
470 case PARSERSTRING_TARGET:
471 ctx->curr = ctx->data + phdr->target_offset;
472 ctx->bytes_remaining = phdr->target_length;
474 case PARSERSTRING_CONNECTION:
475 ctx->curr = ctx->data + phdr->connection_offset;
476 ctx->bytes_remaining = phdr->connection_length;
478 case PARSERSTRING_NAME:
479 ctx->curr = ctx->data + phdr->name_offset;
480 ctx->bytes_remaining = phdr->name_length;
490 static void parser_done(struct parser_context *ctx)
494 controlvm_payload_bytes_buffered -= ctx->param_bytes;
499 parser_string_get(struct parser_context *ctx)
503 int value_length = -1;
510 nscan = ctx->bytes_remaining;
515 for (i = 0, value_length = -1; i < nscan; i++)
516 if (pscan[i] == '\0') {
520 if (value_length < 0) /* '\0' was not included in the length */
521 value_length = nscan;
522 value = kmalloc(value_length + 1, GFP_KERNEL|__GFP_NORETRY);
525 if (value_length > 0)
526 memcpy(value, pscan, value_length);
527 ((u8 *) (value))[value_length] = '\0';
532 static ssize_t toolaction_show(struct device *dev,
533 struct device_attribute *attr,
538 visorchannel_read(controlvm_channel,
539 offsetof(struct spar_controlvm_channel_protocol,
540 tool_action), &tool_action, sizeof(u8));
541 return scnprintf(buf, PAGE_SIZE, "%u\n", tool_action);
544 static ssize_t toolaction_store(struct device *dev,
545 struct device_attribute *attr,
546 const char *buf, size_t count)
551 if (kstrtou8(buf, 10, &tool_action))
554 ret = visorchannel_write(controlvm_channel,
555 offsetof(struct spar_controlvm_channel_protocol,
557 &tool_action, sizeof(u8));
564 static ssize_t boottotool_show(struct device *dev,
565 struct device_attribute *attr,
568 struct efi_spar_indication efi_spar_indication;
570 visorchannel_read(controlvm_channel,
571 offsetof(struct spar_controlvm_channel_protocol,
572 efi_spar_ind), &efi_spar_indication,
573 sizeof(struct efi_spar_indication));
574 return scnprintf(buf, PAGE_SIZE, "%u\n",
575 efi_spar_indication.boot_to_tool);
578 static ssize_t boottotool_store(struct device *dev,
579 struct device_attribute *attr,
580 const char *buf, size_t count)
583 struct efi_spar_indication efi_spar_indication;
585 if (kstrtoint(buf, 10, &val))
588 efi_spar_indication.boot_to_tool = val;
589 ret = visorchannel_write(controlvm_channel,
590 offsetof(struct spar_controlvm_channel_protocol,
591 efi_spar_ind), &(efi_spar_indication),
592 sizeof(struct efi_spar_indication));
599 static ssize_t error_show(struct device *dev, struct device_attribute *attr,
604 visorchannel_read(controlvm_channel,
605 offsetof(struct spar_controlvm_channel_protocol,
607 &error, sizeof(u32));
608 return scnprintf(buf, PAGE_SIZE, "%i\n", error);
611 static ssize_t error_store(struct device *dev, struct device_attribute *attr,
612 const char *buf, size_t count)
617 if (kstrtou32(buf, 10, &error))
620 ret = visorchannel_write(controlvm_channel,
621 offsetof(struct spar_controlvm_channel_protocol,
623 &error, sizeof(u32));
629 static ssize_t textid_show(struct device *dev, struct device_attribute *attr,
634 visorchannel_read(controlvm_channel,
635 offsetof(struct spar_controlvm_channel_protocol,
636 installation_text_id),
637 &text_id, sizeof(u32));
638 return scnprintf(buf, PAGE_SIZE, "%i\n", text_id);
641 static ssize_t textid_store(struct device *dev, struct device_attribute *attr,
642 const char *buf, size_t count)
647 if (kstrtou32(buf, 10, &text_id))
650 ret = visorchannel_write(controlvm_channel,
651 offsetof(struct spar_controlvm_channel_protocol,
652 installation_text_id),
653 &text_id, sizeof(u32));
659 static ssize_t remaining_steps_show(struct device *dev,
660 struct device_attribute *attr, char *buf)
664 visorchannel_read(controlvm_channel,
665 offsetof(struct spar_controlvm_channel_protocol,
666 installation_remaining_steps),
667 &remaining_steps, sizeof(u16));
668 return scnprintf(buf, PAGE_SIZE, "%hu\n", remaining_steps);
671 static ssize_t remaining_steps_store(struct device *dev,
672 struct device_attribute *attr,
673 const char *buf, size_t count)
678 if (kstrtou16(buf, 10, &remaining_steps))
681 ret = visorchannel_write(controlvm_channel,
682 offsetof(struct spar_controlvm_channel_protocol,
683 installation_remaining_steps),
684 &remaining_steps, sizeof(u16));
690 struct visor_busdev {
695 static int match_visorbus_dev_by_id(struct device *dev, void *data)
697 struct visor_device *vdev = to_visor_device(dev);
698 struct visor_busdev *id = (struct visor_busdev *)data;
699 u32 bus_no = id->bus_no;
700 u32 dev_no = id->dev_no;
702 if ((vdev->chipset_bus_no == bus_no) &&
703 (vdev->chipset_dev_no == dev_no))
708 struct visor_device *visorbus_get_device_by_id(u32 bus_no, u32 dev_no,
709 struct visor_device *from)
712 struct device *dev_start = NULL;
713 struct visor_device *vdev = NULL;
714 struct visor_busdev id = {
720 dev_start = &from->device;
721 dev = bus_find_device(&visorbus_type, dev_start, (void *)&id,
722 match_visorbus_dev_by_id);
724 vdev = to_visor_device(dev);
727 EXPORT_SYMBOL(visorbus_get_device_by_id);
730 check_chipset_events(void)
734 /* Check events to determine if response should be sent */
735 for (i = 0; i < MAX_CHIPSET_EVENTS; i++)
736 send_msg &= chipset_events[i];
741 clear_chipset_events(void)
744 /* Clear chipset_events */
745 for (i = 0; i < MAX_CHIPSET_EVENTS; i++)
746 chipset_events[i] = 0;
750 visorchipset_register_busdev(
751 struct visorchipset_busdev_notifiers *notifiers,
752 struct visorchipset_busdev_responders *responders,
753 struct ultra_vbus_deviceinfo *driver_info)
755 down(¬ifier_lock);
757 memset(&busdev_notifiers, 0,
758 sizeof(busdev_notifiers));
759 visorbusregistered = 0; /* clear flag */
761 busdev_notifiers = *notifiers;
762 visorbusregistered = 1; /* set flag */
765 *responders = busdev_responders;
767 bus_device_info_init(driver_info, "chipset", "visorchipset",
772 EXPORT_SYMBOL_GPL(visorchipset_register_busdev);
775 chipset_init(struct controlvm_message *inmsg)
777 static int chipset_inited;
778 enum ultra_chipset_feature features = 0;
779 int rc = CONTROLVM_RESP_SUCCESS;
781 POSTCODE_LINUX_2(CHIPSET_INIT_ENTRY_PC, POSTCODE_SEVERITY_INFO);
782 if (chipset_inited) {
783 rc = -CONTROLVM_RESP_ERROR_ALREADY_DONE;
787 POSTCODE_LINUX_2(CHIPSET_INIT_EXIT_PC, POSTCODE_SEVERITY_INFO);
789 /* Set features to indicate we support parahotplug (if Command
790 * also supports it). */
792 inmsg->cmd.init_chipset.
793 features & ULTRA_CHIPSET_FEATURE_PARA_HOTPLUG;
795 /* Set the "reply" bit so Command knows this is a
796 * features-aware driver. */
797 features |= ULTRA_CHIPSET_FEATURE_REPLY;
800 if (inmsg->hdr.flags.response_expected)
801 controlvm_respond_chipset_init(&inmsg->hdr, rc, features);
805 controlvm_init_response(struct controlvm_message *msg,
806 struct controlvm_message_header *msg_hdr, int response)
808 memset(msg, 0, sizeof(struct controlvm_message));
809 memcpy(&msg->hdr, msg_hdr, sizeof(struct controlvm_message_header));
810 msg->hdr.payload_bytes = 0;
811 msg->hdr.payload_vm_offset = 0;
812 msg->hdr.payload_max_bytes = 0;
814 msg->hdr.flags.failed = 1;
815 msg->hdr.completion_status = (u32) (-response);
820 controlvm_respond(struct controlvm_message_header *msg_hdr, int response)
822 struct controlvm_message outmsg;
824 controlvm_init_response(&outmsg, msg_hdr, response);
825 if (outmsg.hdr.flags.test_message == 1)
828 if (!visorchannel_signalinsert(controlvm_channel,
829 CONTROLVM_QUEUE_REQUEST, &outmsg)) {
835 controlvm_respond_chipset_init(struct controlvm_message_header *msg_hdr,
837 enum ultra_chipset_feature features)
839 struct controlvm_message outmsg;
841 controlvm_init_response(&outmsg, msg_hdr, response);
842 outmsg.cmd.init_chipset.features = features;
843 if (!visorchannel_signalinsert(controlvm_channel,
844 CONTROLVM_QUEUE_REQUEST, &outmsg)) {
849 static void controlvm_respond_physdev_changestate(
850 struct controlvm_message_header *msg_hdr, int response,
851 struct spar_segment_state state)
853 struct controlvm_message outmsg;
855 controlvm_init_response(&outmsg, msg_hdr, response);
856 outmsg.cmd.device_change_state.state = state;
857 outmsg.cmd.device_change_state.flags.phys_device = 1;
858 if (!visorchannel_signalinsert(controlvm_channel,
859 CONTROLVM_QUEUE_REQUEST, &outmsg)) {
864 enum crash_obj_type {
870 bus_responder(enum controlvm_id cmd_id,
871 struct controlvm_message_header *pending_msg_hdr,
874 if (pending_msg_hdr == NULL)
875 return; /* no controlvm response needed */
877 if (pending_msg_hdr->id != (u32)cmd_id)
880 controlvm_respond(pending_msg_hdr, response);
884 device_changestate_responder(enum controlvm_id cmd_id,
885 struct visor_device *p, int response,
886 struct spar_segment_state response_state)
888 struct controlvm_message outmsg;
889 u32 bus_no = p->chipset_bus_no;
890 u32 dev_no = p->chipset_dev_no;
892 if (p->pending_msg_hdr == NULL)
893 return; /* no controlvm response needed */
894 if (p->pending_msg_hdr->id != cmd_id)
897 controlvm_init_response(&outmsg, p->pending_msg_hdr, response);
899 outmsg.cmd.device_change_state.bus_no = bus_no;
900 outmsg.cmd.device_change_state.dev_no = dev_no;
901 outmsg.cmd.device_change_state.state = response_state;
903 if (!visorchannel_signalinsert(controlvm_channel,
904 CONTROLVM_QUEUE_REQUEST, &outmsg))
909 device_responder(enum controlvm_id cmd_id,
910 struct controlvm_message_header *pending_msg_hdr,
913 if (pending_msg_hdr == NULL)
914 return; /* no controlvm response needed */
916 if (pending_msg_hdr->id != (u32)cmd_id)
919 controlvm_respond(pending_msg_hdr, response);
923 bus_epilog(struct visor_device *bus_info,
924 u32 cmd, struct controlvm_message_header *msg_hdr,
925 int response, bool need_response)
927 bool notified = false;
928 struct controlvm_message_header *pmsg_hdr = NULL;
931 /* relying on a valid passed in response code */
932 /* be lazy and re-use msg_hdr for this failure, is this ok?? */
937 if (bus_info->pending_msg_hdr) {
938 /* only non-NULL if dev is still waiting on a response */
939 response = -CONTROLVM_RESP_ERROR_MESSAGE_ID_INVALID_FOR_CLIENT;
940 pmsg_hdr = bus_info->pending_msg_hdr;
945 pmsg_hdr = kzalloc(sizeof(*pmsg_hdr), GFP_KERNEL);
947 response = -CONTROLVM_RESP_ERROR_KMALLOC_FAILED;
951 memcpy(pmsg_hdr, msg_hdr,
952 sizeof(struct controlvm_message_header));
953 bus_info->pending_msg_hdr = pmsg_hdr;
956 down(¬ifier_lock);
957 if (response == CONTROLVM_RESP_SUCCESS) {
959 case CONTROLVM_BUS_CREATE:
960 if (busdev_notifiers.bus_create) {
961 (*busdev_notifiers.bus_create) (bus_info);
965 case CONTROLVM_BUS_DESTROY:
966 if (busdev_notifiers.bus_destroy) {
967 (*busdev_notifiers.bus_destroy) (bus_info);
975 /* The callback function just called above is responsible
976 * for calling the appropriate visorchipset_busdev_responders
977 * function, which will call bus_responder()
982 * Do not kfree(pmsg_hdr) as this is the failure path.
983 * The success path ('notified') will call the responder
984 * directly and kfree() there.
986 bus_responder(cmd, pmsg_hdr, response);
991 device_epilog(struct visor_device *dev_info,
992 struct spar_segment_state state, u32 cmd,
993 struct controlvm_message_header *msg_hdr, int response,
994 bool need_response, bool for_visorbus)
996 struct visorchipset_busdev_notifiers *notifiers;
997 bool notified = false;
998 struct controlvm_message_header *pmsg_hdr = NULL;
1000 notifiers = &busdev_notifiers;
1003 /* relying on a valid passed in response code */
1004 /* be lazy and re-use msg_hdr for this failure, is this ok?? */
1009 if (dev_info->pending_msg_hdr) {
1010 /* only non-NULL if dev is still waiting on a response */
1011 response = -CONTROLVM_RESP_ERROR_MESSAGE_ID_INVALID_FOR_CLIENT;
1012 pmsg_hdr = dev_info->pending_msg_hdr;
1016 if (need_response) {
1017 pmsg_hdr = kzalloc(sizeof(*pmsg_hdr), GFP_KERNEL);
1019 response = -CONTROLVM_RESP_ERROR_KMALLOC_FAILED;
1023 memcpy(pmsg_hdr, msg_hdr,
1024 sizeof(struct controlvm_message_header));
1025 dev_info->pending_msg_hdr = pmsg_hdr;
1028 down(¬ifier_lock);
1029 if (response >= 0) {
1031 case CONTROLVM_DEVICE_CREATE:
1032 if (notifiers->device_create) {
1033 (*notifiers->device_create) (dev_info);
1037 case CONTROLVM_DEVICE_CHANGESTATE:
1038 /* ServerReady / ServerRunning / SegmentStateRunning */
1039 if (state.alive == segment_state_running.alive &&
1041 segment_state_running.operating) {
1042 if (notifiers->device_resume) {
1043 (*notifiers->device_resume) (dev_info);
1047 /* ServerNotReady / ServerLost / SegmentStateStandby */
1048 else if (state.alive == segment_state_standby.alive &&
1050 segment_state_standby.operating) {
1051 /* technically this is standby case
1052 * where server is lost
1054 if (notifiers->device_pause) {
1055 (*notifiers->device_pause) (dev_info);
1060 case CONTROLVM_DEVICE_DESTROY:
1061 if (notifiers->device_destroy) {
1062 (*notifiers->device_destroy) (dev_info);
1070 /* The callback function just called above is responsible
1071 * for calling the appropriate visorchipset_busdev_responders
1072 * function, which will call device_responder()
1077 * Do not kfree(pmsg_hdr) as this is the failure path.
1078 * The success path ('notified') will call the responder
1079 * directly and kfree() there.
1081 device_responder(cmd, pmsg_hdr, response);
1086 bus_create(struct controlvm_message *inmsg)
1088 struct controlvm_message_packet *cmd = &inmsg->cmd;
1089 u32 bus_no = cmd->create_bus.bus_no;
1090 int rc = CONTROLVM_RESP_SUCCESS;
1091 struct visor_device *bus_info;
1092 struct visorchannel *visorchannel;
1094 bus_info = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL);
1095 if (bus_info && (bus_info->state.created == 1)) {
1096 POSTCODE_LINUX_3(BUS_CREATE_FAILURE_PC, bus_no,
1097 POSTCODE_SEVERITY_ERR);
1098 rc = -CONTROLVM_RESP_ERROR_ALREADY_DONE;
1101 bus_info = kzalloc(sizeof(*bus_info), GFP_KERNEL);
1103 POSTCODE_LINUX_3(BUS_CREATE_FAILURE_PC, bus_no,
1104 POSTCODE_SEVERITY_ERR);
1105 rc = -CONTROLVM_RESP_ERROR_KMALLOC_FAILED;
1109 INIT_LIST_HEAD(&bus_info->list_all);
1110 bus_info->chipset_bus_no = bus_no;
1111 bus_info->chipset_dev_no = BUS_ROOT_DEVICE;
1113 POSTCODE_LINUX_3(BUS_CREATE_ENTRY_PC, bus_no, POSTCODE_SEVERITY_INFO);
1115 visorchannel = visorchannel_create(cmd->create_bus.channel_addr,
1116 cmd->create_bus.channel_bytes,
1118 cmd->create_bus.bus_data_type_uuid);
1120 if (!visorchannel) {
1121 POSTCODE_LINUX_3(BUS_CREATE_FAILURE_PC, bus_no,
1122 POSTCODE_SEVERITY_ERR);
1123 rc = -CONTROLVM_RESP_ERROR_KMALLOC_FAILED;
1128 bus_info->visorchannel = visorchannel;
1130 POSTCODE_LINUX_3(BUS_CREATE_EXIT_PC, bus_no, POSTCODE_SEVERITY_INFO);
1133 bus_epilog(bus_info, CONTROLVM_BUS_CREATE, &inmsg->hdr,
1134 rc, inmsg->hdr.flags.response_expected == 1);
1138 bus_destroy(struct controlvm_message *inmsg)
1140 struct controlvm_message_packet *cmd = &inmsg->cmd;
1141 u32 bus_no = cmd->destroy_bus.bus_no;
1142 struct visor_device *bus_info;
1143 int rc = CONTROLVM_RESP_SUCCESS;
1145 bus_info = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL);
1147 rc = -CONTROLVM_RESP_ERROR_BUS_INVALID;
1148 else if (bus_info->state.created == 0)
1149 rc = -CONTROLVM_RESP_ERROR_ALREADY_DONE;
1151 bus_epilog(bus_info, CONTROLVM_BUS_DESTROY, &inmsg->hdr,
1152 rc, inmsg->hdr.flags.response_expected == 1);
1154 /* bus_info is freed as part of the busdevice_release function */
1158 bus_configure(struct controlvm_message *inmsg,
1159 struct parser_context *parser_ctx)
1161 struct controlvm_message_packet *cmd = &inmsg->cmd;
1163 struct visor_device *bus_info;
1164 int rc = CONTROLVM_RESP_SUCCESS;
1166 bus_no = cmd->configure_bus.bus_no;
1167 POSTCODE_LINUX_3(BUS_CONFIGURE_ENTRY_PC, bus_no,
1168 POSTCODE_SEVERITY_INFO);
1170 bus_info = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL);
1172 POSTCODE_LINUX_3(BUS_CONFIGURE_FAILURE_PC, bus_no,
1173 POSTCODE_SEVERITY_ERR);
1174 rc = -CONTROLVM_RESP_ERROR_BUS_INVALID;
1175 } else if (bus_info->state.created == 0) {
1176 POSTCODE_LINUX_3(BUS_CONFIGURE_FAILURE_PC, bus_no,
1177 POSTCODE_SEVERITY_ERR);
1178 rc = -CONTROLVM_RESP_ERROR_BUS_INVALID;
1179 } else if (bus_info->pending_msg_hdr != NULL) {
1180 POSTCODE_LINUX_3(BUS_CONFIGURE_FAILURE_PC, bus_no,
1181 POSTCODE_SEVERITY_ERR);
1182 rc = -CONTROLVM_RESP_ERROR_MESSAGE_ID_INVALID_FOR_CLIENT;
1184 visorchannel_set_clientpartition(bus_info->visorchannel,
1185 cmd->configure_bus.guest_handle);
1186 bus_info->partition_uuid = parser_id_get(parser_ctx);
1187 parser_param_start(parser_ctx, PARSERSTRING_NAME);
1188 bus_info->name = parser_string_get(parser_ctx);
1190 POSTCODE_LINUX_3(BUS_CONFIGURE_EXIT_PC, bus_no,
1191 POSTCODE_SEVERITY_INFO);
1193 bus_epilog(bus_info, CONTROLVM_BUS_CONFIGURE, &inmsg->hdr,
1194 rc, inmsg->hdr.flags.response_expected == 1);
1198 my_device_create(struct controlvm_message *inmsg)
1200 struct controlvm_message_packet *cmd = &inmsg->cmd;
1201 u32 bus_no = cmd->create_device.bus_no;
1202 u32 dev_no = cmd->create_device.dev_no;
1203 struct visor_device *dev_info = NULL;
1204 struct visor_device *bus_info;
1205 struct visorchannel *visorchannel;
1206 int rc = CONTROLVM_RESP_SUCCESS;
1208 bus_info = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL);
1210 POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no,
1211 POSTCODE_SEVERITY_ERR);
1212 rc = -CONTROLVM_RESP_ERROR_BUS_INVALID;
1216 if (bus_info->state.created == 0) {
1217 POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no,
1218 POSTCODE_SEVERITY_ERR);
1219 rc = -CONTROLVM_RESP_ERROR_BUS_INVALID;
1223 dev_info = visorbus_get_device_by_id(bus_no, dev_no, NULL);
1224 if (dev_info && (dev_info->state.created == 1)) {
1225 POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no,
1226 POSTCODE_SEVERITY_ERR);
1227 rc = -CONTROLVM_RESP_ERROR_ALREADY_DONE;
1231 dev_info = kzalloc(sizeof(*dev_info), GFP_KERNEL);
1233 POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no,
1234 POSTCODE_SEVERITY_ERR);
1235 rc = -CONTROLVM_RESP_ERROR_KMALLOC_FAILED;
1239 dev_info->chipset_bus_no = bus_no;
1240 dev_info->chipset_dev_no = dev_no;
1241 dev_info->inst = cmd->create_device.dev_inst_uuid;
1243 /* not sure where the best place to set the 'parent' */
1244 dev_info->device.parent = &bus_info->device;
1246 POSTCODE_LINUX_4(DEVICE_CREATE_ENTRY_PC, dev_no, bus_no,
1247 POSTCODE_SEVERITY_INFO);
1250 visorchannel_create_with_lock(cmd->create_device.channel_addr,
1251 cmd->create_device.channel_bytes,
1253 cmd->create_device.data_type_uuid);
1255 if (!visorchannel) {
1256 POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no,
1257 POSTCODE_SEVERITY_ERR);
1258 rc = -CONTROLVM_RESP_ERROR_KMALLOC_FAILED;
1263 dev_info->visorchannel = visorchannel;
1264 dev_info->channel_type_guid = cmd->create_device.data_type_uuid;
1265 POSTCODE_LINUX_4(DEVICE_CREATE_EXIT_PC, dev_no, bus_no,
1266 POSTCODE_SEVERITY_INFO);
1268 device_epilog(dev_info, segment_state_running,
1269 CONTROLVM_DEVICE_CREATE, &inmsg->hdr, rc,
1270 inmsg->hdr.flags.response_expected == 1, 1);
1274 my_device_changestate(struct controlvm_message *inmsg)
1276 struct controlvm_message_packet *cmd = &inmsg->cmd;
1277 u32 bus_no = cmd->device_change_state.bus_no;
1278 u32 dev_no = cmd->device_change_state.dev_no;
1279 struct spar_segment_state state = cmd->device_change_state.state;
1280 struct visor_device *dev_info;
1281 int rc = CONTROLVM_RESP_SUCCESS;
1283 dev_info = visorbus_get_device_by_id(bus_no, dev_no, NULL);
1285 POSTCODE_LINUX_4(DEVICE_CHANGESTATE_FAILURE_PC, dev_no, bus_no,
1286 POSTCODE_SEVERITY_ERR);
1287 rc = -CONTROLVM_RESP_ERROR_DEVICE_INVALID;
1288 } else if (dev_info->state.created == 0) {
1289 POSTCODE_LINUX_4(DEVICE_CHANGESTATE_FAILURE_PC, dev_no, bus_no,
1290 POSTCODE_SEVERITY_ERR);
1291 rc = -CONTROLVM_RESP_ERROR_DEVICE_INVALID;
1293 if ((rc >= CONTROLVM_RESP_SUCCESS) && dev_info)
1294 device_epilog(dev_info, state,
1295 CONTROLVM_DEVICE_CHANGESTATE, &inmsg->hdr, rc,
1296 inmsg->hdr.flags.response_expected == 1, 1);
1300 my_device_destroy(struct controlvm_message *inmsg)
1302 struct controlvm_message_packet *cmd = &inmsg->cmd;
1303 u32 bus_no = cmd->destroy_device.bus_no;
1304 u32 dev_no = cmd->destroy_device.dev_no;
1305 struct visor_device *dev_info;
1306 int rc = CONTROLVM_RESP_SUCCESS;
1308 dev_info = visorbus_get_device_by_id(bus_no, dev_no, NULL);
1310 rc = -CONTROLVM_RESP_ERROR_DEVICE_INVALID;
1311 else if (dev_info->state.created == 0)
1312 rc = -CONTROLVM_RESP_ERROR_ALREADY_DONE;
1314 if ((rc >= CONTROLVM_RESP_SUCCESS) && dev_info)
1315 device_epilog(dev_info, segment_state_running,
1316 CONTROLVM_DEVICE_DESTROY, &inmsg->hdr, rc,
1317 inmsg->hdr.flags.response_expected == 1, 1);
1320 /* When provided with the physical address of the controlvm channel
1321 * (phys_addr), the offset to the payload area we need to manage
1322 * (offset), and the size of this payload area (bytes), fills in the
1323 * controlvm_payload_info struct. Returns true for success or false
1327 initialize_controlvm_payload_info(u64 phys_addr, u64 offset, u32 bytes,
1328 struct visor_controlvm_payload_info *info)
1330 u8 __iomem *payload = NULL;
1331 int rc = CONTROLVM_RESP_SUCCESS;
1334 rc = -CONTROLVM_RESP_ERROR_PAYLOAD_INVALID;
1337 memset(info, 0, sizeof(struct visor_controlvm_payload_info));
1338 if ((offset == 0) || (bytes == 0)) {
1339 rc = -CONTROLVM_RESP_ERROR_PAYLOAD_INVALID;
1342 payload = ioremap_cache(phys_addr + offset, bytes);
1344 rc = -CONTROLVM_RESP_ERROR_IOREMAP_FAILED;
1348 info->offset = offset;
1349 info->bytes = bytes;
1350 info->ptr = payload;
1363 destroy_controlvm_payload_info(struct visor_controlvm_payload_info *info)
1369 memset(info, 0, sizeof(struct visor_controlvm_payload_info));
1373 initialize_controlvm_payload(void)
1375 u64 phys_addr = visorchannel_get_physaddr(controlvm_channel);
1376 u64 payload_offset = 0;
1377 u32 payload_bytes = 0;
1379 if (visorchannel_read(controlvm_channel,
1380 offsetof(struct spar_controlvm_channel_protocol,
1381 request_payload_offset),
1382 &payload_offset, sizeof(payload_offset)) < 0) {
1383 POSTCODE_LINUX_2(CONTROLVM_INIT_FAILURE_PC,
1384 POSTCODE_SEVERITY_ERR);
1387 if (visorchannel_read(controlvm_channel,
1388 offsetof(struct spar_controlvm_channel_protocol,
1389 request_payload_bytes),
1390 &payload_bytes, sizeof(payload_bytes)) < 0) {
1391 POSTCODE_LINUX_2(CONTROLVM_INIT_FAILURE_PC,
1392 POSTCODE_SEVERITY_ERR);
1395 initialize_controlvm_payload_info(phys_addr,
1396 payload_offset, payload_bytes,
1397 &controlvm_payload_info);
1400 /* Send ACTION=online for DEVPATH=/sys/devices/platform/visorchipset.
1401 * Returns CONTROLVM_RESP_xxx code.
1404 visorchipset_chipset_ready(void)
1406 kobject_uevent(&visorchipset_platform_device.dev.kobj, KOBJ_ONLINE);
1407 return CONTROLVM_RESP_SUCCESS;
1411 visorchipset_chipset_selftest(void)
1413 char env_selftest[20];
1414 char *envp[] = { env_selftest, NULL };
1416 sprintf(env_selftest, "SPARSP_SELFTEST=%d", 1);
1417 kobject_uevent_env(&visorchipset_platform_device.dev.kobj, KOBJ_CHANGE,
1419 return CONTROLVM_RESP_SUCCESS;
1422 /* Send ACTION=offline for DEVPATH=/sys/devices/platform/visorchipset.
1423 * Returns CONTROLVM_RESP_xxx code.
1426 visorchipset_chipset_notready(void)
1428 kobject_uevent(&visorchipset_platform_device.dev.kobj, KOBJ_OFFLINE);
1429 return CONTROLVM_RESP_SUCCESS;
1433 chipset_ready(struct controlvm_message_header *msg_hdr)
1435 int rc = visorchipset_chipset_ready();
1437 if (rc != CONTROLVM_RESP_SUCCESS)
1439 if (msg_hdr->flags.response_expected && !visorchipset_holdchipsetready)
1440 controlvm_respond(msg_hdr, rc);
1441 if (msg_hdr->flags.response_expected && visorchipset_holdchipsetready) {
1442 /* Send CHIPSET_READY response when all modules have been loaded
1443 * and disks mounted for the partition
1445 g_chipset_msg_hdr = *msg_hdr;
1450 chipset_selftest(struct controlvm_message_header *msg_hdr)
1452 int rc = visorchipset_chipset_selftest();
1454 if (rc != CONTROLVM_RESP_SUCCESS)
1456 if (msg_hdr->flags.response_expected)
1457 controlvm_respond(msg_hdr, rc);
1461 chipset_notready(struct controlvm_message_header *msg_hdr)
1463 int rc = visorchipset_chipset_notready();
1465 if (rc != CONTROLVM_RESP_SUCCESS)
1467 if (msg_hdr->flags.response_expected)
1468 controlvm_respond(msg_hdr, rc);
1471 /* This is your "one-stop" shop for grabbing the next message from the
1472 * CONTROLVM_QUEUE_EVENT queue in the controlvm channel.
1475 read_controlvm_event(struct controlvm_message *msg)
1477 if (visorchannel_signalremove(controlvm_channel,
1478 CONTROLVM_QUEUE_EVENT, msg)) {
1480 if (msg->hdr.flags.test_message == 1)
1488 * The general parahotplug flow works as follows. The visorchipset
1489 * driver receives a DEVICE_CHANGESTATE message from Command
1490 * specifying a physical device to enable or disable. The CONTROLVM
1491 * message handler calls parahotplug_process_message, which then adds
1492 * the message to a global list and kicks off a udev event which
1493 * causes a user level script to enable or disable the specified
1494 * device. The udev script then writes to
1495 * /proc/visorchipset/parahotplug, which causes parahotplug_proc_write
1496 * to get called, at which point the appropriate CONTROLVM message is
1497 * retrieved from the list and responded to.
1500 #define PARAHOTPLUG_TIMEOUT_MS 2000
1503 * Generate unique int to match an outstanding CONTROLVM message with a
1504 * udev script /proc response
1507 parahotplug_next_id(void)
1509 static atomic_t id = ATOMIC_INIT(0);
1511 return atomic_inc_return(&id);
1515 * Returns the time (in jiffies) when a CONTROLVM message on the list
1516 * should expire -- PARAHOTPLUG_TIMEOUT_MS in the future
1518 static unsigned long
1519 parahotplug_next_expiration(void)
1521 return jiffies + msecs_to_jiffies(PARAHOTPLUG_TIMEOUT_MS);
1525 * Create a parahotplug_request, which is basically a wrapper for a
1526 * CONTROLVM_MESSAGE that we can stick on a list
1528 static struct parahotplug_request *
1529 parahotplug_request_create(struct controlvm_message *msg)
1531 struct parahotplug_request *req;
1533 req = kmalloc(sizeof(*req), GFP_KERNEL | __GFP_NORETRY);
1537 req->id = parahotplug_next_id();
1538 req->expiration = parahotplug_next_expiration();
1545 * Free a parahotplug_request.
1548 parahotplug_request_destroy(struct parahotplug_request *req)
1554 * Cause uevent to run the user level script to do the disable/enable
1555 * specified in (the CONTROLVM message in) the specified
1556 * parahotplug_request
1559 parahotplug_request_kickoff(struct parahotplug_request *req)
1561 struct controlvm_message_packet *cmd = &req->msg.cmd;
1562 char env_cmd[40], env_id[40], env_state[40], env_bus[40], env_dev[40],
1565 env_cmd, env_id, env_state, env_bus, env_dev, env_func, NULL
1568 sprintf(env_cmd, "SPAR_PARAHOTPLUG=1");
1569 sprintf(env_id, "SPAR_PARAHOTPLUG_ID=%d", req->id);
1570 sprintf(env_state, "SPAR_PARAHOTPLUG_STATE=%d",
1571 cmd->device_change_state.state.active);
1572 sprintf(env_bus, "SPAR_PARAHOTPLUG_BUS=%d",
1573 cmd->device_change_state.bus_no);
1574 sprintf(env_dev, "SPAR_PARAHOTPLUG_DEVICE=%d",
1575 cmd->device_change_state.dev_no >> 3);
1576 sprintf(env_func, "SPAR_PARAHOTPLUG_FUNCTION=%d",
1577 cmd->device_change_state.dev_no & 0x7);
1579 kobject_uevent_env(&visorchipset_platform_device.dev.kobj, KOBJ_CHANGE,
1584 * Remove any request from the list that's been on there too long and
1585 * respond with an error.
1588 parahotplug_process_list(void)
1590 struct list_head *pos;
1591 struct list_head *tmp;
1593 spin_lock(¶hotplug_request_list_lock);
1595 list_for_each_safe(pos, tmp, ¶hotplug_request_list) {
1596 struct parahotplug_request *req =
1597 list_entry(pos, struct parahotplug_request, list);
1599 if (!time_after_eq(jiffies, req->expiration))
1603 if (req->msg.hdr.flags.response_expected)
1604 controlvm_respond_physdev_changestate(
1606 CONTROLVM_RESP_ERROR_DEVICE_UDEV_TIMEOUT,
1607 req->msg.cmd.device_change_state.state);
1608 parahotplug_request_destroy(req);
1611 spin_unlock(¶hotplug_request_list_lock);
1615 * Called from the /proc handler, which means the user script has
1616 * finished the enable/disable. Find the matching identifier, and
1617 * respond to the CONTROLVM message with success.
1620 parahotplug_request_complete(int id, u16 active)
1622 struct list_head *pos;
1623 struct list_head *tmp;
1625 spin_lock(¶hotplug_request_list_lock);
1627 /* Look for a request matching "id". */
1628 list_for_each_safe(pos, tmp, ¶hotplug_request_list) {
1629 struct parahotplug_request *req =
1630 list_entry(pos, struct parahotplug_request, list);
1631 if (req->id == id) {
1632 /* Found a match. Remove it from the list and
1636 spin_unlock(¶hotplug_request_list_lock);
1637 req->msg.cmd.device_change_state.state.active = active;
1638 if (req->msg.hdr.flags.response_expected)
1639 controlvm_respond_physdev_changestate(
1640 &req->msg.hdr, CONTROLVM_RESP_SUCCESS,
1641 req->msg.cmd.device_change_state.state);
1642 parahotplug_request_destroy(req);
1647 spin_unlock(¶hotplug_request_list_lock);
1652 * Enables or disables a PCI device by kicking off a udev script
1655 parahotplug_process_message(struct controlvm_message *inmsg)
1657 struct parahotplug_request *req;
1659 req = parahotplug_request_create(inmsg);
1664 if (inmsg->cmd.device_change_state.state.active) {
1665 /* For enable messages, just respond with success
1666 * right away. This is a bit of a hack, but there are
1667 * issues with the early enable messages we get (with
1668 * either the udev script not detecting that the device
1669 * is up, or not getting called at all). Fortunately
1670 * the messages that get lost don't matter anyway, as
1671 * devices are automatically enabled at
1674 parahotplug_request_kickoff(req);
1675 controlvm_respond_physdev_changestate(&inmsg->hdr,
1676 CONTROLVM_RESP_SUCCESS,
1677 inmsg->cmd.device_change_state.state);
1678 parahotplug_request_destroy(req);
1680 /* For disable messages, add the request to the
1681 * request list before kicking off the udev script. It
1682 * won't get responded to until the script has
1683 * indicated it's done.
1685 spin_lock(¶hotplug_request_list_lock);
1686 list_add_tail(&req->list, ¶hotplug_request_list);
1687 spin_unlock(¶hotplug_request_list_lock);
1689 parahotplug_request_kickoff(req);
1693 /* Process a controlvm message.
1695 * false - this function will return false only in the case where the
1696 * controlvm message was NOT processed, but processing must be
1697 * retried before reading the next controlvm message; a
1698 * scenario where this can occur is when we need to throttle
1699 * the allocation of memory in which to copy out controlvm
1701 * true - processing of the controlvm message completed,
1702 * either successfully or with an error.
1705 handle_command(struct controlvm_message inmsg, u64 channel_addr)
1707 struct controlvm_message_packet *cmd = &inmsg.cmd;
1710 struct parser_context *parser_ctx = NULL;
1712 struct controlvm_message ackmsg;
1714 /* create parsing context if necessary */
1715 local_addr = (inmsg.hdr.flags.test_message == 1);
1716 if (channel_addr == 0)
1718 parm_addr = channel_addr + inmsg.hdr.payload_vm_offset;
1719 parm_bytes = inmsg.hdr.payload_bytes;
1721 /* Parameter and channel addresses within test messages actually lie
1722 * within our OS-controlled memory. We need to know that, because it
1723 * makes a difference in how we compute the virtual address.
1725 if (parm_addr && parm_bytes) {
1729 parser_init_byte_stream(parm_addr, parm_bytes,
1730 local_addr, &retry);
1731 if (!parser_ctx && retry)
1736 controlvm_init_response(&ackmsg, &inmsg.hdr,
1737 CONTROLVM_RESP_SUCCESS);
1738 if (controlvm_channel)
1739 visorchannel_signalinsert(controlvm_channel,
1740 CONTROLVM_QUEUE_ACK,
1743 switch (inmsg.hdr.id) {
1744 case CONTROLVM_CHIPSET_INIT:
1745 chipset_init(&inmsg);
1747 case CONTROLVM_BUS_CREATE:
1750 case CONTROLVM_BUS_DESTROY:
1751 bus_destroy(&inmsg);
1753 case CONTROLVM_BUS_CONFIGURE:
1754 bus_configure(&inmsg, parser_ctx);
1756 case CONTROLVM_DEVICE_CREATE:
1757 my_device_create(&inmsg);
1759 case CONTROLVM_DEVICE_CHANGESTATE:
1760 if (cmd->device_change_state.flags.phys_device) {
1761 parahotplug_process_message(&inmsg);
1763 /* save the hdr and cmd structures for later use */
1764 /* when sending back the response to Command */
1765 my_device_changestate(&inmsg);
1766 g_devicechangestate_packet = inmsg.cmd;
1770 case CONTROLVM_DEVICE_DESTROY:
1771 my_device_destroy(&inmsg);
1773 case CONTROLVM_DEVICE_CONFIGURE:
1774 /* no op for now, just send a respond that we passed */
1775 if (inmsg.hdr.flags.response_expected)
1776 controlvm_respond(&inmsg.hdr, CONTROLVM_RESP_SUCCESS);
1778 case CONTROLVM_CHIPSET_READY:
1779 chipset_ready(&inmsg.hdr);
1781 case CONTROLVM_CHIPSET_SELFTEST:
1782 chipset_selftest(&inmsg.hdr);
1784 case CONTROLVM_CHIPSET_STOP:
1785 chipset_notready(&inmsg.hdr);
1788 if (inmsg.hdr.flags.response_expected)
1789 controlvm_respond(&inmsg.hdr,
1790 -CONTROLVM_RESP_ERROR_MESSAGE_ID_UNKNOWN);
1795 parser_done(parser_ctx);
1801 static inline unsigned int
1802 issue_vmcall_io_controlvm_addr(u64 *control_addr, u32 *control_bytes)
1804 struct vmcall_io_controlvm_addr_params params;
1805 int result = VMCALL_SUCCESS;
1808 physaddr = virt_to_phys(¶ms);
1809 ISSUE_IO_VMCALL(VMCALL_IO_CONTROLVM_ADDR, physaddr, result);
1810 if (VMCALL_SUCCESSFUL(result)) {
1811 *control_addr = params.address;
1812 *control_bytes = params.channel_bytes;
1817 static u64 controlvm_get_channel_address(void)
1822 if (!VMCALL_SUCCESSFUL(issue_vmcall_io_controlvm_addr(&addr, &size)))
1829 controlvm_periodic_work(struct work_struct *work)
1831 struct controlvm_message inmsg;
1832 bool got_command = false;
1833 bool handle_command_failed = false;
1834 static u64 poll_count;
1836 /* make sure visorbus server is registered for controlvm callbacks */
1837 if (visorchipset_visorbusregwait && !visorbusregistered)
1841 if (poll_count >= 250)
1846 /* Check events to determine if response to CHIPSET_READY
1849 if (visorchipset_holdchipsetready &&
1850 (g_chipset_msg_hdr.id != CONTROLVM_INVALID)) {
1851 if (check_chipset_events() == 1) {
1852 controlvm_respond(&g_chipset_msg_hdr, 0);
1853 clear_chipset_events();
1854 memset(&g_chipset_msg_hdr, 0,
1855 sizeof(struct controlvm_message_header));
1859 while (visorchannel_signalremove(controlvm_channel,
1860 CONTROLVM_QUEUE_RESPONSE,
1864 if (controlvm_pending_msg_valid) {
1865 /* we throttled processing of a prior
1866 * msg, so try to process it again
1867 * rather than reading a new one
1869 inmsg = controlvm_pending_msg;
1870 controlvm_pending_msg_valid = false;
1873 got_command = read_controlvm_event(&inmsg);
1877 handle_command_failed = false;
1878 while (got_command && (!handle_command_failed)) {
1879 most_recent_message_jiffies = jiffies;
1880 if (handle_command(inmsg,
1881 visorchannel_get_physaddr
1882 (controlvm_channel)))
1883 got_command = read_controlvm_event(&inmsg);
1885 /* this is a scenario where throttling
1886 * is required, but probably NOT an
1887 * error...; we stash the current
1888 * controlvm msg so we will attempt to
1889 * reprocess it on our next loop
1891 handle_command_failed = true;
1892 controlvm_pending_msg = inmsg;
1893 controlvm_pending_msg_valid = true;
1897 /* parahotplug_worker */
1898 parahotplug_process_list();
1902 if (time_after(jiffies,
1903 most_recent_message_jiffies + (HZ * MIN_IDLE_SECONDS))) {
1904 /* it's been longer than MIN_IDLE_SECONDS since we
1905 * processed our last controlvm message; slow down the
1908 if (poll_jiffies != POLLJIFFIES_CONTROLVMCHANNEL_SLOW)
1909 poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_SLOW;
1911 if (poll_jiffies != POLLJIFFIES_CONTROLVMCHANNEL_FAST)
1912 poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_FAST;
1915 queue_delayed_work(periodic_controlvm_workqueue,
1916 &periodic_controlvm_work, poll_jiffies);
1920 setup_crash_devices_work_queue(struct work_struct *work)
1922 struct controlvm_message local_crash_bus_msg;
1923 struct controlvm_message local_crash_dev_msg;
1924 struct controlvm_message msg;
1925 u32 local_crash_msg_offset;
1926 u16 local_crash_msg_count;
1928 /* make sure visorbus is registered for controlvm callbacks */
1929 if (visorchipset_visorbusregwait && !visorbusregistered)
1932 POSTCODE_LINUX_2(CRASH_DEV_ENTRY_PC, POSTCODE_SEVERITY_INFO);
1934 /* send init chipset msg */
1935 msg.hdr.id = CONTROLVM_CHIPSET_INIT;
1936 msg.cmd.init_chipset.bus_count = 23;
1937 msg.cmd.init_chipset.switch_count = 0;
1941 /* get saved message count */
1942 if (visorchannel_read(controlvm_channel,
1943 offsetof(struct spar_controlvm_channel_protocol,
1944 saved_crash_message_count),
1945 &local_crash_msg_count, sizeof(u16)) < 0) {
1946 POSTCODE_LINUX_2(CRASH_DEV_CTRL_RD_FAILURE_PC,
1947 POSTCODE_SEVERITY_ERR);
1951 if (local_crash_msg_count != CONTROLVM_CRASHMSG_MAX) {
1952 POSTCODE_LINUX_3(CRASH_DEV_COUNT_FAILURE_PC,
1953 local_crash_msg_count,
1954 POSTCODE_SEVERITY_ERR);
1958 /* get saved crash message offset */
1959 if (visorchannel_read(controlvm_channel,
1960 offsetof(struct spar_controlvm_channel_protocol,
1961 saved_crash_message_offset),
1962 &local_crash_msg_offset, sizeof(u32)) < 0) {
1963 POSTCODE_LINUX_2(CRASH_DEV_CTRL_RD_FAILURE_PC,
1964 POSTCODE_SEVERITY_ERR);
1968 /* read create device message for storage bus offset */
1969 if (visorchannel_read(controlvm_channel,
1970 local_crash_msg_offset,
1971 &local_crash_bus_msg,
1972 sizeof(struct controlvm_message)) < 0) {
1973 POSTCODE_LINUX_2(CRASH_DEV_RD_BUS_FAIULRE_PC,
1974 POSTCODE_SEVERITY_ERR);
1978 /* read create device message for storage device */
1979 if (visorchannel_read(controlvm_channel,
1980 local_crash_msg_offset +
1981 sizeof(struct controlvm_message),
1982 &local_crash_dev_msg,
1983 sizeof(struct controlvm_message)) < 0) {
1984 POSTCODE_LINUX_2(CRASH_DEV_RD_DEV_FAIULRE_PC,
1985 POSTCODE_SEVERITY_ERR);
1989 /* reuse IOVM create bus message */
1990 if (local_crash_bus_msg.cmd.create_bus.channel_addr) {
1991 bus_create(&local_crash_bus_msg);
1993 POSTCODE_LINUX_2(CRASH_DEV_BUS_NULL_FAILURE_PC,
1994 POSTCODE_SEVERITY_ERR);
1998 /* reuse create device message for storage device */
1999 if (local_crash_dev_msg.cmd.create_device.channel_addr) {
2000 my_device_create(&local_crash_dev_msg);
2002 POSTCODE_LINUX_2(CRASH_DEV_DEV_NULL_FAILURE_PC,
2003 POSTCODE_SEVERITY_ERR);
2006 POSTCODE_LINUX_2(CRASH_DEV_EXIT_PC, POSTCODE_SEVERITY_INFO);
2011 poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_SLOW;
2013 queue_delayed_work(periodic_controlvm_workqueue,
2014 &periodic_controlvm_work, poll_jiffies);
2018 bus_create_response(struct visor_device *bus_info, int response)
2021 bus_info->state.created = 1;
2023 bus_responder(CONTROLVM_BUS_CREATE, bus_info->pending_msg_hdr,
2026 kfree(bus_info->pending_msg_hdr);
2027 bus_info->pending_msg_hdr = NULL;
2031 bus_destroy_response(struct visor_device *bus_info, int response)
2033 bus_responder(CONTROLVM_BUS_DESTROY, bus_info->pending_msg_hdr,
2036 kfree(bus_info->pending_msg_hdr);
2037 bus_info->pending_msg_hdr = NULL;
2041 device_create_response(struct visor_device *dev_info, int response)
2044 dev_info->state.created = 1;
2046 device_responder(CONTROLVM_DEVICE_CREATE, dev_info->pending_msg_hdr,
2049 kfree(dev_info->pending_msg_hdr);
2050 dev_info->pending_msg_hdr = NULL;
2054 device_destroy_response(struct visor_device *dev_info, int response)
2056 device_responder(CONTROLVM_DEVICE_DESTROY, dev_info->pending_msg_hdr,
2059 kfree(dev_info->pending_msg_hdr);
2060 dev_info->pending_msg_hdr = NULL;
2064 visorchipset_device_pause_response(struct visor_device *dev_info,
2067 device_changestate_responder(CONTROLVM_DEVICE_CHANGESTATE,
2069 segment_state_standby);
2071 kfree(dev_info->pending_msg_hdr);
2072 dev_info->pending_msg_hdr = NULL;
2076 device_resume_response(struct visor_device *dev_info, int response)
2078 device_changestate_responder(CONTROLVM_DEVICE_CHANGESTATE,
2080 segment_state_running);
2082 kfree(dev_info->pending_msg_hdr);
2083 dev_info->pending_msg_hdr = NULL;
2086 static ssize_t chipsetready_store(struct device *dev,
2087 struct device_attribute *attr,
2088 const char *buf, size_t count)
2092 if (sscanf(buf, "%63s", msgtype) != 1)
2095 if (!strcmp(msgtype, "CALLHOMEDISK_MOUNTED")) {
2096 chipset_events[0] = 1;
2098 } else if (!strcmp(msgtype, "MODULES_LOADED")) {
2099 chipset_events[1] = 1;
2105 /* The parahotplug/devicedisabled interface gets called by our support script
2106 * when an SR-IOV device has been shut down. The ID is passed to the script
2107 * and then passed back when the device has been removed.
2109 static ssize_t devicedisabled_store(struct device *dev,
2110 struct device_attribute *attr,
2111 const char *buf, size_t count)
2115 if (kstrtouint(buf, 10, &id))
2118 parahotplug_request_complete(id, 0);
2122 /* The parahotplug/deviceenabled interface gets called by our support script
2123 * when an SR-IOV device has been recovered. The ID is passed to the script
2124 * and then passed back when the device has been brought back up.
2126 static ssize_t deviceenabled_store(struct device *dev,
2127 struct device_attribute *attr,
2128 const char *buf, size_t count)
2132 if (kstrtouint(buf, 10, &id))
2135 parahotplug_request_complete(id, 1);
2140 visorchipset_mmap(struct file *file, struct vm_area_struct *vma)
2142 unsigned long physaddr = 0;
2143 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
2146 /* sv_enable_dfp(); */
2147 if (offset & (PAGE_SIZE - 1))
2148 return -ENXIO; /* need aligned offsets */
2151 case VISORCHIPSET_MMAP_CONTROLCHANOFFSET:
2152 vma->vm_flags |= VM_IO;
2153 if (!*file_controlvm_channel)
2156 visorchannel_read(*file_controlvm_channel,
2157 offsetof(struct spar_controlvm_channel_protocol,
2158 gp_control_channel),
2159 &addr, sizeof(addr));
2163 physaddr = (unsigned long)addr;
2164 if (remap_pfn_range(vma, vma->vm_start,
2165 physaddr >> PAGE_SHIFT,
2166 vma->vm_end - vma->vm_start,
2167 /*pgprot_noncached */
2168 (vma->vm_page_prot))) {
2178 static inline s64 issue_vmcall_query_guest_virtual_time_offset(void)
2180 u64 result = VMCALL_SUCCESS;
2183 ISSUE_IO_VMCALL(VMCALL_QUERY_GUEST_VIRTUAL_TIME_OFFSET, physaddr,
2188 static inline int issue_vmcall_update_physical_time(u64 adjustment)
2190 int result = VMCALL_SUCCESS;
2192 ISSUE_IO_VMCALL(VMCALL_UPDATE_PHYSICAL_TIME, adjustment, result);
2196 static long visorchipset_ioctl(struct file *file, unsigned int cmd,
2203 case VMCALL_QUERY_GUEST_VIRTUAL_TIME_OFFSET:
2204 /* get the physical rtc offset */
2205 vrtc_offset = issue_vmcall_query_guest_virtual_time_offset();
2206 if (copy_to_user((void __user *)arg, &vrtc_offset,
2207 sizeof(vrtc_offset))) {
2211 case VMCALL_UPDATE_PHYSICAL_TIME:
2212 if (copy_from_user(&adjustment, (void __user *)arg,
2213 sizeof(adjustment))) {
2216 return issue_vmcall_update_physical_time(adjustment);
2222 static const struct file_operations visorchipset_fops = {
2223 .owner = THIS_MODULE,
2224 .open = visorchipset_open,
2227 .unlocked_ioctl = visorchipset_ioctl,
2228 .release = visorchipset_release,
2229 .mmap = visorchipset_mmap,
2233 visorchipset_file_init(dev_t major_dev, struct visorchannel **controlvm_channel)
2237 file_controlvm_channel = controlvm_channel;
2238 cdev_init(&file_cdev, &visorchipset_fops);
2239 file_cdev.owner = THIS_MODULE;
2240 if (MAJOR(major_dev) == 0) {
2241 rc = alloc_chrdev_region(&major_dev, 0, 1, "visorchipset");
2242 /* dynamic major device number registration required */
2246 /* static major device number registration required */
2247 rc = register_chrdev_region(major_dev, 1, "visorchipset");
2251 rc = cdev_add(&file_cdev, MKDEV(MAJOR(major_dev), 0), 1);
2253 unregister_chrdev_region(major_dev, 1);
2260 visorchipset_init(struct acpi_device *acpi_device)
2264 int tmp_sz = sizeof(struct spar_controlvm_channel_protocol);
2265 uuid_le uuid = SPAR_CONTROLVM_CHANNEL_PROTOCOL_UUID;
2267 addr = controlvm_get_channel_address();
2271 memset(&busdev_notifiers, 0, sizeof(busdev_notifiers));
2272 memset(&controlvm_payload_info, 0, sizeof(controlvm_payload_info));
2274 controlvm_channel = visorchannel_create_with_lock(addr, tmp_sz,
2276 if (SPAR_CONTROLVM_CHANNEL_OK_CLIENT(
2277 visorchannel_get_header(controlvm_channel))) {
2278 initialize_controlvm_payload();
2280 visorchannel_destroy(controlvm_channel);
2281 controlvm_channel = NULL;
2285 major_dev = MKDEV(visorchipset_major, 0);
2286 rc = visorchipset_file_init(major_dev, &controlvm_channel);
2288 POSTCODE_LINUX_2(CHIPSET_INIT_FAILURE_PC, DIAG_SEVERITY_ERR);
2292 memset(&g_chipset_msg_hdr, 0, sizeof(struct controlvm_message_header));
2294 /* if booting in a crash kernel */
2295 if (is_kdump_kernel())
2296 INIT_DELAYED_WORK(&periodic_controlvm_work,
2297 setup_crash_devices_work_queue);
2299 INIT_DELAYED_WORK(&periodic_controlvm_work,
2300 controlvm_periodic_work);
2301 periodic_controlvm_workqueue =
2302 create_singlethread_workqueue("visorchipset_controlvm");
2304 if (!periodic_controlvm_workqueue) {
2305 POSTCODE_LINUX_2(CREATE_WORKQUEUE_FAILED_PC,
2310 most_recent_message_jiffies = jiffies;
2311 poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_FAST;
2312 rc = queue_delayed_work(periodic_controlvm_workqueue,
2313 &periodic_controlvm_work, poll_jiffies);
2315 POSTCODE_LINUX_2(QUEUE_DELAYED_WORK_PC,
2320 visorchipset_platform_device.dev.devt = major_dev;
2321 if (platform_device_register(&visorchipset_platform_device) < 0) {
2322 POSTCODE_LINUX_2(DEVICE_REGISTER_FAILURE_PC, DIAG_SEVERITY_ERR);
2326 POSTCODE_LINUX_2(CHIPSET_INIT_SUCCESS_PC, POSTCODE_SEVERITY_INFO);
2328 rc = visorbus_init();
2331 POSTCODE_LINUX_3(CHIPSET_INIT_FAILURE_PC, rc,
2332 POSTCODE_SEVERITY_ERR);
2338 visorchipset_file_cleanup(dev_t major_dev)
2341 cdev_del(&file_cdev);
2342 file_cdev.ops = NULL;
2343 unregister_chrdev_region(major_dev, 1);
2347 visorchipset_exit(struct acpi_device *acpi_device)
2349 POSTCODE_LINUX_2(DRIVER_EXIT_PC, POSTCODE_SEVERITY_INFO);
2353 cancel_delayed_work(&periodic_controlvm_work);
2354 flush_workqueue(periodic_controlvm_workqueue);
2355 destroy_workqueue(periodic_controlvm_workqueue);
2356 periodic_controlvm_workqueue = NULL;
2357 destroy_controlvm_payload_info(&controlvm_payload_info);
2359 memset(&g_chipset_msg_hdr, 0, sizeof(struct controlvm_message_header));
2361 visorchannel_destroy(controlvm_channel);
2363 visorchipset_file_cleanup(visorchipset_platform_device.dev.devt);
2364 platform_device_unregister(&visorchipset_platform_device);
2365 POSTCODE_LINUX_2(DRIVER_EXIT_PC, POSTCODE_SEVERITY_INFO);
2370 static const struct acpi_device_id unisys_device_ids[] = {
2375 static struct acpi_driver unisys_acpi_driver = {
2376 .name = "unisys_acpi",
2377 .class = "unisys_acpi_class",
2378 .owner = THIS_MODULE,
2379 .ids = unisys_device_ids,
2381 .add = visorchipset_init,
2382 .remove = visorchipset_exit,
2386 MODULE_DEVICE_TABLE(acpi, unisys_device_ids);
2388 static __init uint32_t visorutil_spar_detect(void)
2390 unsigned int eax, ebx, ecx, edx;
2392 if (cpu_has_hypervisor) {
2394 cpuid(UNISYS_SPAR_LEAF_ID, &eax, &ebx, &ecx, &edx);
2395 return (ebx == UNISYS_SPAR_ID_EBX) &&
2396 (ecx == UNISYS_SPAR_ID_ECX) &&
2397 (edx == UNISYS_SPAR_ID_EDX);
2403 static int init_unisys(void)
2407 if (!visorutil_spar_detect())
2410 result = acpi_bus_register_driver(&unisys_acpi_driver);
2414 pr_info("Unisys Visorchipset Driver Loaded.\n");
2418 static void exit_unisys(void)
2420 acpi_bus_unregister_driver(&unisys_acpi_driver);
2423 module_param_named(major, visorchipset_major, int, S_IRUGO);
2424 MODULE_PARM_DESC(visorchipset_major,
2425 "major device number to use for the device node");
2426 module_param_named(visorbusregwait, visorchipset_visorbusregwait, int, S_IRUGO);
2427 MODULE_PARM_DESC(visorchipset_visorbusreqwait,
2428 "1 to have the module wait for the visor bus to register");
2429 module_param_named(holdchipsetready, visorchipset_holdchipsetready,
2431 MODULE_PARM_DESC(visorchipset_holdchipsetready,
2432 "1 to hold response to CHIPSET_READY");
2434 module_init(init_unisys);
2435 module_exit(exit_unisys);
2437 MODULE_AUTHOR("Unisys");
2438 MODULE_LICENSE("GPL");
2439 MODULE_DESCRIPTION("Supervisor chipset driver for service partition: ver "
2441 MODULE_VERSION(VERSION);