drivers/staging/unisys/visorchipset/visorchipset_main.c

   1 /* visorchipset_main.c
   2  *
   3  * Copyright (C) 2010 - 2013 UNISYS CORPORATION
   4  * All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or (at
   9  * your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  14  * NON INFRINGEMENT.  See the GNU General Public License for more
  15  * details.
  16  */
  17
  18 #include "globals.h"
  19 #include "visorchipset.h"
  20 #include "procobjecttree.h"
  21 #include "visorchannel.h"
  22 #include "periodic_work.h"
  23 #include "file.h"
  24 #include "parser.h"
  25 #include "uisutils.h"
  26 #include "controlvmcompletionstatus.h"
  27 #include "guestlinuxdebug.h"
  28
  29 #include <linux/nls.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/platform_device.h>
  32 #include <linux/uuid.h>
  33
  34 #define CURRENT_FILE_PC VISOR_CHIPSET_PC_visorchipset_main_c
  35 #define TEST_VNIC_PHYSITF "eth0"        /* physical network itf for
  36                                          * vnic loopback test */
  37 #define TEST_VNIC_SWITCHNO 1
  38 #define TEST_VNIC_BUSNO 9
  39
  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
  45
  46 /* When the controlvm channel is idle for at least MIN_IDLE_SECONDS,
  47 * we switch to slow polling mode.  As soon as we get a controlvm
  48 * message, we switch back to fast polling mode.
  49 */
  50 #define MIN_IDLE_SECONDS 10
  51 static ulong Poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_FAST;
  52 static ulong Most_recent_message_jiffies;       /* when we got our last
  53                                                  * controlvm message */
  54 static inline char *
  55 NONULLSTR(char *s)
  56 {
  57         if (s)
  58                 return s;
  59         return "";
  60 }
  61
  62 static int serverregistered;
  63 static int clientregistered;
  64
  65 #define MAX_CHIPSET_EVENTS 2
  66 static u8 chipset_events[MAX_CHIPSET_EVENTS] = { 0, 0 };
  67
  68 static struct delayed_work Periodic_controlvm_work;
  69 static struct workqueue_struct *Periodic_controlvm_workqueue;
  70 static DEFINE_SEMAPHORE(NotifierLock);
  71
  72 static struct controlvm_message_header g_DiagMsgHdr;
  73 static struct controlvm_message_header g_ChipSetMsgHdr;
  74 static struct controlvm_message_header g_DelDumpMsgHdr;
  75 static const uuid_le UltraDiagPoolChannelProtocolGuid =
  76         SPAR_DIAG_POOL_CHANNEL_PROTOCOL_UUID;
  77 /* 0xffffff is an invalid Bus/Device number */
  78 static ulong g_diagpoolBusNo = 0xffffff;
  79 static ulong g_diagpoolDevNo = 0xffffff;
  80 static struct controlvm_message_packet g_DeviceChangeStatePacket;
  81
  82 /* Only VNIC and VHBA channels are sent to visorclientbus (aka
  83  * "visorhackbus")
  84  */
  85 #define FOR_VISORHACKBUS(channel_type_guid) \
  86         (((uuid_le_cmp(channel_type_guid,\
  87                        spar_vnic_channel_protocol_uuid) == 0)\
  88         || (uuid_le_cmp(channel_type_guid,\
  89                         spar_vhba_channel_protocol_uuid) == 0)))
  90 #define FOR_VISORBUS(channel_type_guid) (!(FOR_VISORHACKBUS(channel_type_guid)))
  91
  92 #define is_diagpool_channel(channel_type_guid) \
  93          (uuid_le_cmp(channel_type_guid, UltraDiagPoolChannelProtocolGuid) == 0)
  94
  95 static LIST_HEAD(BusInfoList);
  96 static LIST_HEAD(DevInfoList);
  97
  98 static struct visorchannel *ControlVm_channel;
  99
 100 struct controlvm_payload_info {
 101         u8 __iomem *ptr;        /* pointer to base address of payload pool */
 102         u64 offset;             /* offset from beginning of controlvm
 103                                  * channel to beginning of payload * pool */
 104         u32 bytes;              /* number of bytes in payload pool */
 105 };
 106
 107 /* Manages the request payload in the controlvm channel */
 108 static struct controlvm_payload_info ControlVm_payload_info;
 109
 110 static struct channel_header *Test_Vnic_channel;
 111
 112 struct livedump_info {
 113         struct controlvm_message_header Dumpcapture_header;
 114         struct controlvm_message_header Gettextdump_header;
 115         struct controlvm_message_header Dumpcomplete_header;
 116         BOOL Gettextdump_outstanding;
 117         u32 crc32;
 118         ulong length;
 119         atomic_t buffers_in_use;
 120         ulong destination;
 121 };
 122 /* Manages the info for a CONTROLVM_DUMP_CAPTURESTATE /
 123  * CONTROLVM_DUMP_GETTEXTDUMP / CONTROLVM_DUMP_COMPLETE conversation.
 124  */
 125 static struct livedump_info LiveDump_info;
 126
 127 /* The following globals are used to handle the scenario where we are unable to
 128  * offload the payload from a controlvm message due to memory requirements.  In
 129  * this scenario, we simply stash the controlvm message, then attempt to
 130  * process it again the next time controlvm_periodic_work() runs.
 131  */
 132 static struct controlvm_message ControlVm_Pending_Msg;
 133 static BOOL ControlVm_Pending_Msg_Valid = FALSE;
 134
 135 /* Pool of struct putfile_buffer_entry, for keeping track of pending (incoming)
 136  * TRANSMIT_FILE PutFile payloads.
 137  */
 138 static struct kmem_cache *Putfile_buffer_list_pool;
 139 static const char Putfile_buffer_list_pool_name[] =
 140         "controlvm_putfile_buffer_list_pool";
 141
 142 /* This identifies a data buffer that has been received via a controlvm messages
 143  * in a remote --> local CONTROLVM_TRANSMIT_FILE conversation.
 144  */
 145 struct putfile_buffer_entry {
 146         struct list_head next;  /* putfile_buffer_entry list */
 147         PARSER_CONTEXT *parser_ctx; /* points to buffer containing input data */
 148 };
 149
 150 /* List of struct putfile_request *, via next_putfile_request member.
 151  * Each entry in this list identifies an outstanding TRANSMIT_FILE
 152  * conversation.
 153  */
 154 static LIST_HEAD(Putfile_request_list);
 155
 156 /* This describes a buffer and its current state of transfer (e.g., how many
 157  * bytes have already been supplied as putfile data, and how many bytes are
 158  * remaining) for a putfile_request.
 159  */
 160 struct putfile_active_buffer {
 161         /* a payload from a controlvm message, containing a file data buffer */
 162         PARSER_CONTEXT *parser_ctx;
 163         /* points within data area of parser_ctx to next byte of data */
 164         u8 *pnext;
 165         /* # bytes left from <pnext> to the end of this data buffer */
 166         size_t bytes_remaining;
 167 };
 168
 169 #define PUTFILE_REQUEST_SIG 0x0906101302281211
 170 /* This identifies a single remote --> local CONTROLVM_TRANSMIT_FILE
 171  * conversation.  Structs of this type are dynamically linked into
 172  * <Putfile_request_list>.
 173  */
 174 struct putfile_request {
 175         u64 sig;                /* PUTFILE_REQUEST_SIG */
 176
 177         /* header from original TransmitFile request */
 178         struct controlvm_message_header controlvm_header;
 179         u64 file_request_number;        /* from original TransmitFile request */
 180
 181         /* link to next struct putfile_request */
 182         struct list_head next_putfile_request;
 183
 184         /* most-recent sequence number supplied via a controlvm message */
 185         u64 data_sequence_number;
 186
 187         /* head of putfile_buffer_entry list, which describes the data to be
 188          * supplied as putfile data;
 189          * - this list is added to when controlvm messages come in that supply
 190          * file data
 191          * - this list is removed from via the hotplug program that is actually
 192          * consuming these buffers to write as file data */
 193         struct list_head input_buffer_list;
 194         spinlock_t req_list_lock;       /* lock for input_buffer_list */
 195
 196         /* waiters for input_buffer_list to go non-empty */
 197         wait_queue_head_t input_buffer_wq;
 198
 199         /* data not yet read within current putfile_buffer_entry */
 200         struct putfile_active_buffer active_buf;
 201
 202         /* <0 = failed, 0 = in-progress, >0 = successful; */
 203         /* note that this must be set with req_list_lock, and if you set <0, */
 204         /* it is your responsibility to also free up all of the other objects */
 205         /* in this struct (like input_buffer_list, active_buf.parser_ctx) */
 206         /* before releasing the lock */
 207         int completion_status;
 208 };
 209
 210 static atomic_t Visorchipset_cache_buffers_in_use = ATOMIC_INIT(0);
 211
 212 struct parahotplug_request {
 213         struct list_head list;
 214         int id;
 215         unsigned long expiration;
 216         struct controlvm_message msg;
 217 };
 218
 219 static LIST_HEAD(Parahotplug_request_list);
 220 static DEFINE_SPINLOCK(Parahotplug_request_list_lock);  /* lock for above */
 221 static void parahotplug_process_list(void);
 222
 223 /* Manages the info for a CONTROLVM_DUMP_CAPTURESTATE /
 224  * CONTROLVM_REPORTEVENT.
 225  */
 226 static struct visorchipset_busdev_notifiers BusDev_Server_Notifiers;
 227 static struct visorchipset_busdev_notifiers BusDev_Client_Notifiers;
 228
 229 static void bus_create_response(ulong busNo, int response);
 230 static void bus_destroy_response(ulong busNo, int response);
 231 static void device_create_response(ulong busNo, ulong devNo, int response);
 232 static void device_destroy_response(ulong busNo, ulong devNo, int response);
 233 static void device_resume_response(ulong busNo, ulong devNo, int response);
 234
 235 static struct visorchipset_busdev_responders BusDev_Responders = {
 236         .bus_create = bus_create_response,
 237         .bus_destroy = bus_destroy_response,
 238         .device_create = device_create_response,
 239         .device_destroy = device_destroy_response,
 240         .device_pause = visorchipset_device_pause_response,
 241         .device_resume = device_resume_response,
 242 };
 243
 244 /* info for /dev/visorchipset */
 245 static dev_t MajorDev = -1; /**< indicates major num for device */
 246
 247 /* prototypes for attributes */
 248 static ssize_t toolaction_show(struct device *dev,
 249         struct device_attribute *attr, char *buf);
 250 static ssize_t toolaction_store(struct device *dev,
 251         struct device_attribute *attr, const char *buf, size_t count);
 252 static DEVICE_ATTR_RW(toolaction);
 253
 254 static ssize_t boottotool_show(struct device *dev,
 255         struct device_attribute *attr, char *buf);
 256 static ssize_t boottotool_store(struct device *dev,
 257         struct device_attribute *attr, const char *buf, size_t count);
 258 static DEVICE_ATTR_RW(boottotool);
 259
 260 static ssize_t error_show(struct device *dev, struct device_attribute *attr,
 261         char *buf);
 262 static ssize_t error_store(struct device *dev, struct device_attribute *attr,
 263         const char *buf, size_t count);
 264 static DEVICE_ATTR_RW(error);
 265
 266 static ssize_t textid_show(struct device *dev, struct device_attribute *attr,
 267         char *buf);
 268 static ssize_t textid_store(struct device *dev, struct device_attribute *attr,
 269         const char *buf, size_t count);
 270 static DEVICE_ATTR_RW(textid);
 271
 272 static ssize_t remaining_steps_show(struct device *dev,
 273         struct device_attribute *attr, char *buf);
 274 static ssize_t remaining_steps_store(struct device *dev,
 275         struct device_attribute *attr, const char *buf, size_t count);
 276 static DEVICE_ATTR_RW(remaining_steps);
 277
 278 static ssize_t chipsetready_store(struct device *dev,
 279                 struct device_attribute *attr, const char *buf, size_t count);
 280 static DEVICE_ATTR_WO(chipsetready);
 281
 282 static ssize_t devicedisabled_store(struct device *dev,
 283                 struct device_attribute *attr, const char *buf, size_t count);
 284 static DEVICE_ATTR_WO(devicedisabled);
 285
 286 static ssize_t deviceenabled_store(struct device *dev,
 287                 struct device_attribute *attr, const char *buf, size_t count);
 288 static DEVICE_ATTR_WO(deviceenabled);
 289
 290 static struct attribute *visorchipset_install_attrs[] = {
 291         &dev_attr_toolaction.attr,
 292         &dev_attr_boottotool.attr,
 293         &dev_attr_error.attr,
 294         &dev_attr_textid.attr,
 295         &dev_attr_remaining_steps.attr,
 296         NULL
 297 };
 298
 299 static struct attribute_group visorchipset_install_group = {
 300         .name = "install",
 301         .attrs = visorchipset_install_attrs
 302 };
 303
 304 static struct attribute *visorchipset_guest_attrs[] = {
 305         &dev_attr_chipsetready.attr,
 306         NULL
 307 };
 308
 309 static struct attribute_group visorchipset_guest_group = {
 310         .name = "guest",
 311         .attrs = visorchipset_guest_attrs
 312 };
 313
 314 static struct attribute *visorchipset_parahotplug_attrs[] = {
 315         &dev_attr_devicedisabled.attr,
 316         &dev_attr_deviceenabled.attr,
 317         NULL
 318 };
 319
 320 static struct attribute_group visorchipset_parahotplug_group = {
 321         .name = "parahotplug",
 322         .attrs = visorchipset_parahotplug_attrs
 323 };
 324
 325 static const struct attribute_group *visorchipset_dev_groups[] = {
 326         &visorchipset_install_group,
 327         &visorchipset_guest_group,
 328         &visorchipset_parahotplug_group,
 329         NULL
 330 };
 331
 332 /* /sys/devices/platform/visorchipset */
 333 static struct platform_device Visorchipset_platform_device = {
 334         .name = "visorchipset",
 335         .id = -1,
 336         .dev.groups = visorchipset_dev_groups,
 337 };
 338
 339 /* Function prototypes */
 340 static void controlvm_respond(struct controlvm_message_header *msgHdr,
 341                               int response);
 342 static void controlvm_respond_chipset_init(
 343                 struct controlvm_message_header *msgHdr, int response,
 344                 enum ultra_chipset_feature features);
 345 static void controlvm_respond_physdev_changestate(
 346                 struct controlvm_message_header *msgHdr, int response,
 347                 struct spar_segment_state state);
 348
 349 static ssize_t toolaction_show(struct device *dev,
 350                                struct device_attribute *attr,
 351                                char *buf)
 352 {
 353         u8 toolAction;
 354
 355         visorchannel_read(ControlVm_channel,
 356                 offsetof(struct spar_controlvm_channel_protocol,
 357                            tool_action), &toolAction, sizeof(u8));
 358         return scnprintf(buf, PAGE_SIZE, "%u\n", toolAction);
 359 }
 360
 361 static ssize_t toolaction_store(struct device *dev,
 362                                 struct device_attribute *attr,
 363                                 const char *buf, size_t count)
 364 {
 365         u8 toolAction;
 366         int ret;
 367
 368         if (kstrtou8(buf, 10, &toolAction) != 0)
 369                 return -EINVAL;
 370
 371         ret = visorchannel_write(ControlVm_channel,
 372                 offsetof(struct spar_controlvm_channel_protocol, tool_action),
 373                 &toolAction, sizeof(u8));
 374
 375         if (ret)
 376                 return ret;
 377         return count;
 378 }
 379
 380 static ssize_t boottotool_show(struct device *dev,
 381                                struct device_attribute *attr,
 382                                char *buf)
 383 {
 384         struct efi_spar_indication efiSparIndication;
 385
 386         visorchannel_read(ControlVm_channel,
 387                 offsetof(struct spar_controlvm_channel_protocol,
 388                         efi_spar_ind), &efiSparIndication,
 389                 sizeof(struct efi_spar_indication));
 390         return scnprintf(buf, PAGE_SIZE, "%u\n",
 391                         efiSparIndication.boot_to_tool);
 392 }
 393
 394 static ssize_t boottotool_store(struct device *dev,
 395                                 struct device_attribute *attr,
 396                                 const char *buf, size_t count)
 397 {
 398         int val, ret;
 399         struct efi_spar_indication efiSparIndication;
 400
 401         if (kstrtoint(buf, 10, &val) != 0)
 402                 return -EINVAL;
 403
 404         efiSparIndication.boot_to_tool = val;
 405         ret = visorchannel_write(ControlVm_channel,
 406                         offsetof(struct spar_controlvm_channel_protocol,
 407                                 efi_spar_ind),
 408                         &(efiSparIndication),
 409                 sizeof(struct efi_spar_indication));
 410
 411         if (ret)
 412                 return ret;
 413         return count;
 414 }
 415
 416 static ssize_t error_show(struct device *dev, struct device_attribute *attr,
 417                 char *buf)
 418 {
 419         u32 error;
 420
 421         visorchannel_read(ControlVm_channel, offsetof(
 422                 struct spar_controlvm_channel_protocol, installation_error),
 423                 &error, sizeof(u32));
 424         return scnprintf(buf, PAGE_SIZE, "%i\n", error);
 425 }
 426
 427 static ssize_t error_store(struct device *dev, struct device_attribute *attr,
 428                 const char *buf, size_t count)
 429 {
 430         u32 error;
 431         int ret;
 432
 433         if (kstrtou32(buf, 10, &error) != 0)
 434                 return -EINVAL;
 435
 436         ret = visorchannel_write(ControlVm_channel,
 437                         offsetof(struct spar_controlvm_channel_protocol,
 438                                 installation_error),
 439                         &error, sizeof(u32));
 440         if (ret)
 441                 return ret;
 442         return count;
 443 }
 444
 445 static ssize_t textid_show(struct device *dev, struct device_attribute *attr,
 446                 char *buf)
 447 {
 448         u32 textId;
 449
 450         visorchannel_read(ControlVm_channel, offsetof(
 451                 struct spar_controlvm_channel_protocol, installation_text_id),
 452                 &textId, sizeof(u32));
 453         return scnprintf(buf, PAGE_SIZE, "%i\n", textId);
 454 }
 455
 456 static ssize_t textid_store(struct device *dev, struct device_attribute *attr,
 457                 const char *buf, size_t count)
 458 {
 459         u32 textId;
 460         int ret;
 461
 462         if (kstrtou32(buf, 10, &textId) != 0)
 463                 return -EINVAL;
 464
 465         ret = visorchannel_write(ControlVm_channel,
 466                         offsetof(struct spar_controlvm_channel_protocol,
 467                                 installation_text_id),
 468                         &textId, sizeof(u32));
 469         if (ret)
 470                 return ret;
 471         return count;
 472 }
 473
 474
 475 static ssize_t remaining_steps_show(struct device *dev,
 476         struct device_attribute *attr, char *buf)
 477 {
 478         u16 remainingSteps;
 479
 480         visorchannel_read(ControlVm_channel,
 481                 offsetof(struct spar_controlvm_channel_protocol,
 482                         installation_remaining_steps),
 483                 &remainingSteps,
 484                 sizeof(u16));
 485         return scnprintf(buf, PAGE_SIZE, "%hu\n", remainingSteps);
 486 }
 487
 488 static ssize_t remaining_steps_store(struct device *dev,
 489         struct device_attribute *attr, const char *buf, size_t count)
 490 {
 491         u16 remainingSteps;
 492         int ret;
 493
 494         if (kstrtou16(buf, 10, &remainingSteps) != 0)
 495                 return -EINVAL;
 496
 497         ret = visorchannel_write(ControlVm_channel,
 498                         offsetof(struct spar_controlvm_channel_protocol,
 499                                 installation_remaining_steps),
 500                         &remainingSteps, sizeof(u16));
 501         if (ret)
 502                 return ret;
 503         return count;
 504 }
 505
 506 #if 0
 507 static void
 508 testUnicode(void)
 509 {
 510         wchar_t unicodeString[] = { 'a', 'b', 'c', 0 };
 511         char s[sizeof(unicodeString) * NLS_MAX_CHARSET_SIZE];
 512         wchar_t unicode2[99];
 513
 514         /* NOTE: Either due to a bug, or feature I don't understand, the
 515          *       kernel utf8_mbstowcs() and utf_wcstombs() do NOT copy the
 516          *       trailed NUL byte!!   REALLY!!!!!    Arrrrgggghhhhh
 517          */
 518
 519         LOGINF("sizeof(wchar_t) = %d", sizeof(wchar_t));
 520         LOGINF("utf8_wcstombs=%d",
 521                chrs = utf8_wcstombs(s, unicodeString, sizeof(s)));
 522         if (chrs >= 0)
 523                 s[chrs] = '\0'; /* GRRRRRRRR */
 524         LOGINF("s='%s'", s);
 525         LOGINF("utf8_mbstowcs=%d", chrs = utf8_mbstowcs(unicode2, s, 100));
 526         if (chrs >= 0)
 527                 unicode2[chrs] = 0;     /* GRRRRRRRR */
 528         if (memcmp(unicodeString, unicode2, sizeof(unicodeString)) == 0)
 529                 LOGINF("strings match... good");
 530         else
 531                 LOGINF("strings did not match!!");
 532 }
 533 #endif
 534
 535 static void
 536 busInfo_clear(void *v)
 537 {
 538         struct visorchipset_bus_info *p = (struct visorchipset_bus_info *) (v);
 539
 540         if (p->proc_object) {
 541                 visor_proc_DestroyObject(p->proc_object);
 542                 p->proc_object = NULL;
 543         }
 544         kfree(p->name);
 545         p->name = NULL;
 546
 547         kfree(p->description);
 548         p->description = NULL;
 549
 550         p->state.created = 0;
 551         memset(p, 0, sizeof(struct visorchipset_bus_info));
 552 }
 553
 554 static void
 555 devInfo_clear(void *v)
 556 {
 557         struct visorchipset_device_info *p =
 558                         (struct visorchipset_device_info *)(v);
 559
 560         p->state.created = 0;
 561         memset(p, 0, sizeof(struct visorchipset_device_info));
 562 }
 563
 564 static u8
 565 check_chipset_events(void)
 566 {
 567         int i;
 568         u8 send_msg = 1;
 569         /* Check events to determine if response should be sent */
 570         for (i = 0; i < MAX_CHIPSET_EVENTS; i++)
 571                 send_msg &= chipset_events[i];
 572         return send_msg;
 573 }
 574
 575 static void
 576 clear_chipset_events(void)
 577 {
 578         int i;
 579         /* Clear chipset_events */
 580         for (i = 0; i < MAX_CHIPSET_EVENTS; i++)
 581                 chipset_events[i] = 0;
 582 }
 583
 584 void
 585 visorchipset_register_busdev_server(
 586                         struct visorchipset_busdev_notifiers *notifiers,
 587                         struct visorchipset_busdev_responders *responders,
 588                         struct ultra_vbus_deviceinfo *driver_info)
 589 {
 590         down(&NotifierLock);
 591         if (notifiers == NULL) {
 592                 memset(&BusDev_Server_Notifiers, 0,
 593                        sizeof(BusDev_Server_Notifiers));
 594                 serverregistered = 0;   /* clear flag */
 595         } else {
 596                 BusDev_Server_Notifiers = *notifiers;
 597                 serverregistered = 1;   /* set flag */
 598         }
 599         if (responders)
 600                 *responders = BusDev_Responders;
 601         if (driver_info)
 602                 bus_device_info_init(driver_info, "chipset", "visorchipset",
 603                                    VERSION, NULL);
 604
 605         up(&NotifierLock);
 606 }
 607 EXPORT_SYMBOL_GPL(visorchipset_register_busdev_server);
 608
 609 void
 610 visorchipset_register_busdev_client(
 611                         struct visorchipset_busdev_notifiers *notifiers,
 612                         struct visorchipset_busdev_responders *responders,
 613                         struct ultra_vbus_deviceinfo *driver_info)
 614 {
 615         down(&NotifierLock);
 616         if (notifiers == NULL) {
 617                 memset(&BusDev_Client_Notifiers, 0,
 618                        sizeof(BusDev_Client_Notifiers));
 619                 clientregistered = 0;   /* clear flag */
 620         } else {
 621                 BusDev_Client_Notifiers = *notifiers;
 622                 clientregistered = 1;   /* set flag */
 623         }
 624         if (responders)
 625                 *responders = BusDev_Responders;
 626         if (driver_info)
 627                 bus_device_info_init(driver_info, "chipset(bolts)",
 628                                      "visorchipset", VERSION, NULL);
 629         up(&NotifierLock);
 630 }
 631 EXPORT_SYMBOL_GPL(visorchipset_register_busdev_client);
 632
 633 static void
 634 cleanup_controlvm_structures(void)
 635 {
 636         struct visorchipset_bus_info *bi, *tmp_bi;
 637         struct visorchipset_device_info *di, *tmp_di;
 638
 639         list_for_each_entry_safe(bi, tmp_bi, &BusInfoList, entry) {
 640                 busInfo_clear(bi);
 641                 list_del(&bi->entry);
 642                 kfree(bi);
 643         }
 644
 645         list_for_each_entry_safe(di, tmp_di, &DevInfoList, entry) {
 646                 devInfo_clear(di);
 647                 list_del(&di->entry);
 648                 kfree(di);
 649         }
 650 }
 651
 652 static void
 653 chipset_init(struct controlvm_message *inmsg)
 654 {
 655         static int chipset_inited;
 656         enum ultra_chipset_feature features = 0;
 657         int rc = CONTROLVM_RESP_SUCCESS;
 658
 659         POSTCODE_LINUX_2(CHIPSET_INIT_ENTRY_PC, POSTCODE_SEVERITY_INFO);
 660         if (chipset_inited) {
 661                 rc = -CONTROLVM_RESP_ERROR_ALREADY_DONE;
 662                 goto Away;
 663         }
 664         chipset_inited = 1;
 665         POSTCODE_LINUX_2(CHIPSET_INIT_EXIT_PC, POSTCODE_SEVERITY_INFO);
 666
 667         /* Set features to indicate we support parahotplug (if Command
 668          * also supports it). */
 669         features =
 670             inmsg->cmd.init_chipset.
 671             features & ULTRA_CHIPSET_FEATURE_PARA_HOTPLUG;
 672
 673         /* Set the "reply" bit so Command knows this is a
 674          * features-aware driver. */
 675         features |= ULTRA_CHIPSET_FEATURE_REPLY;
 676
 677 Away:
 678         if (rc < 0)
 679                 cleanup_controlvm_structures();
 680         if (inmsg->hdr.flags.response_expected)
 681                 controlvm_respond_chipset_init(&inmsg->hdr, rc, features);
 682 }
 683
 684 static void
 685 controlvm_init_response(struct controlvm_message *msg,
 686                         struct controlvm_message_header *msgHdr, int response)
 687 {
 688         memset(msg, 0, sizeof(struct controlvm_message));
 689         memcpy(&msg->hdr, msgHdr, sizeof(struct controlvm_message_header));
 690         msg->hdr.payload_bytes = 0;
 691         msg->hdr.payload_vm_offset = 0;
 692         msg->hdr.payload_max_bytes = 0;
 693         if (response < 0) {
 694                 msg->hdr.flags.failed = 1;
 695                 msg->hdr.completion_status = (u32) (-response);
 696         }
 697 }
 698
 699 static void
 700 controlvm_respond(struct controlvm_message_header *msgHdr, int response)
 701 {
 702         struct controlvm_message outmsg;
 703
 704         controlvm_init_response(&outmsg, msgHdr, response);
 705         /* For DiagPool channel DEVICE_CHANGESTATE, we need to send
 706         * back the deviceChangeState structure in the packet. */
 707         if (msgHdr->id == CONTROLVM_DEVICE_CHANGESTATE
 708             && g_DeviceChangeStatePacket.device_change_state.bus_no ==
 709             g_diagpoolBusNo
 710             && g_DeviceChangeStatePacket.device_change_state.dev_no ==
 711             g_diagpoolDevNo)
 712                 outmsg.cmd = g_DeviceChangeStatePacket;
 713         if (outmsg.hdr.flags.test_message == 1)
 714                 return;
 715
 716         if (!visorchannel_signalinsert(ControlVm_channel,
 717                                        CONTROLVM_QUEUE_REQUEST, &outmsg)) {
 718                 return;
 719         }
 720 }
 721
 722 static void
 723 controlvm_respond_chipset_init(struct controlvm_message_header *msgHdr,
 724                                int response,
 725                                enum ultra_chipset_feature features)
 726 {
 727         struct controlvm_message outmsg;
 728
 729         controlvm_init_response(&outmsg, msgHdr, response);
 730         outmsg.cmd.init_chipset.features = features;
 731         if (!visorchannel_signalinsert(ControlVm_channel,
 732                                        CONTROLVM_QUEUE_REQUEST, &outmsg)) {
 733                 return;
 734         }
 735 }
 736
 737 static void controlvm_respond_physdev_changestate(
 738                 struct controlvm_message_header *msgHdr, int response,
 739                 struct spar_segment_state state)
 740 {
 741         struct controlvm_message outmsg;
 742
 743         controlvm_init_response(&outmsg, msgHdr, response);
 744         outmsg.cmd.device_change_state.state = state;
 745         outmsg.cmd.device_change_state.flags.phys_device = 1;
 746         if (!visorchannel_signalinsert(ControlVm_channel,
 747                                        CONTROLVM_QUEUE_REQUEST, &outmsg)) {
 748                 return;
 749         }
 750 }
 751
 752 void
 753 visorchipset_save_message(struct controlvm_message *msg,
 754                           enum crash_obj_type type)
 755 {
 756         u32 localSavedCrashMsgOffset;
 757         u16 localSavedCrashMsgCount;
 758
 759         /* get saved message count */
 760         if (visorchannel_read(ControlVm_channel,
 761                               offsetof(struct spar_controlvm_channel_protocol,
 762                                        saved_crash_message_count),
 763                               &localSavedCrashMsgCount, sizeof(u16)) < 0) {
 764                 POSTCODE_LINUX_2(CRASH_DEV_CTRL_RD_FAILURE_PC,
 765                                  POSTCODE_SEVERITY_ERR);
 766                 return;
 767         }
 768
 769         if (localSavedCrashMsgCount != CONTROLVM_CRASHMSG_MAX) {
 770                 POSTCODE_LINUX_3(CRASH_DEV_COUNT_FAILURE_PC,
 771                                  localSavedCrashMsgCount,
 772                                  POSTCODE_SEVERITY_ERR);
 773                 return;
 774         }
 775
 776         /* get saved crash message offset */
 777         if (visorchannel_read(ControlVm_channel,
 778                               offsetof(struct spar_controlvm_channel_protocol,
 779                                        saved_crash_message_offset),
 780                               &localSavedCrashMsgOffset, sizeof(u32)) < 0) {
 781                 POSTCODE_LINUX_2(CRASH_DEV_CTRL_RD_FAILURE_PC,
 782                                  POSTCODE_SEVERITY_ERR);
 783                 return;
 784         }
 785
 786         if (type == CRASH_BUS) {
 787                 if (visorchannel_write(ControlVm_channel,
 788                                        localSavedCrashMsgOffset,
 789                                        msg,
 790                                        sizeof(struct controlvm_message)) < 0) {
 791                         POSTCODE_LINUX_2(SAVE_MSG_BUS_FAILURE_PC,
 792                                          POSTCODE_SEVERITY_ERR);
 793                         return;
 794                 }
 795         } else {
 796                 if (visorchannel_write(ControlVm_channel,
 797                                        localSavedCrashMsgOffset +
 798                                        sizeof(struct controlvm_message), msg,
 799                                        sizeof(struct controlvm_message)) < 0) {
 800                         POSTCODE_LINUX_2(SAVE_MSG_DEV_FAILURE_PC,
 801                                          POSTCODE_SEVERITY_ERR);
 802                         return;
 803                 }
 804         }
 805 }
 806 EXPORT_SYMBOL_GPL(visorchipset_save_message);
 807
 808 static void
 809 bus_responder(enum controlvm_id cmdId, ulong busNo, int response)
 810 {
 811         struct visorchipset_bus_info *p = NULL;
 812         BOOL need_clear = FALSE;
 813
 814         p = findbus(&BusInfoList, busNo);
 815         if (!p)
 816                 return;
 817
 818         if (response < 0) {
 819                 if ((cmdId == CONTROLVM_BUS_CREATE) &&
 820                     (response != (-CONTROLVM_RESP_ERROR_ALREADY_DONE)))
 821                         /* undo the row we just created... */
 822                         delbusdevices(&DevInfoList, busNo);
 823         } else {
 824                 if (cmdId == CONTROLVM_BUS_CREATE)
 825                         p->state.created = 1;
 826                 if (cmdId == CONTROLVM_BUS_DESTROY)
 827                         need_clear = TRUE;
 828         }
 829
 830         if (p->pending_msg_hdr.id == CONTROLVM_INVALID)
 831                 return;         /* no controlvm response needed */
 832         if (p->pending_msg_hdr.id != (u32) cmdId)
 833                 return;
 834         controlvm_respond(&p->pending_msg_hdr, response);
 835         p->pending_msg_hdr.id = CONTROLVM_INVALID;
 836         if (need_clear) {
 837                 busInfo_clear(p);
 838                 delbusdevices(&DevInfoList, busNo);
 839         }
 840 }
 841
 842 static void
 843 device_changestate_responder(enum controlvm_id cmdId,
 844                              ulong busNo, ulong devNo, int response,
 845                              struct spar_segment_state responseState)
 846 {
 847         struct visorchipset_device_info *p = NULL;
 848         struct controlvm_message outmsg;
 849
 850         p = finddevice(&DevInfoList, busNo, devNo);
 851         if (!p)
 852                 return;
 853         if (p->pending_msg_hdr.id == CONTROLVM_INVALID)
 854                 return;         /* no controlvm response needed */
 855         if (p->pending_msg_hdr.id != cmdId)
 856                 return;
 857
 858         controlvm_init_response(&outmsg, &p->pending_msg_hdr, response);
 859
 860         outmsg.cmd.device_change_state.bus_no = busNo;
 861         outmsg.cmd.device_change_state.dev_no = devNo;
 862         outmsg.cmd.device_change_state.state = responseState;
 863
 864         if (!visorchannel_signalinsert(ControlVm_channel,
 865                                        CONTROLVM_QUEUE_REQUEST, &outmsg))
 866                 return;
 867
 868         p->pending_msg_hdr.id = CONTROLVM_INVALID;
 869 }
 870
 871 static void
 872 device_responder(enum controlvm_id cmdId, ulong busNo, ulong devNo,
 873                  int response)
 874 {
 875         struct visorchipset_device_info *p = NULL;
 876         BOOL need_clear = FALSE;
 877
 878         p = finddevice(&DevInfoList, busNo, devNo);
 879         if (!p)
 880                 return;
 881         if (response >= 0) {
 882                 if (cmdId == CONTROLVM_DEVICE_CREATE)
 883                         p->state.created = 1;
 884                 if (cmdId == CONTROLVM_DEVICE_DESTROY)
 885                         need_clear = TRUE;
 886         }
 887
 888         if (p->pending_msg_hdr.id == CONTROLVM_INVALID)
 889                 return;         /* no controlvm response needed */
 890
 891         if (p->pending_msg_hdr.id != (u32) cmdId)
 892                 return;
 893
 894         controlvm_respond(&p->pending_msg_hdr, response);
 895         p->pending_msg_hdr.id = CONTROLVM_INVALID;
 896         if (need_clear)
 897                 devInfo_clear(p);
 898 }
 899
 900 static void
 901 bus_epilog(u32 busNo,
 902            u32 cmd, struct controlvm_message_header *msgHdr,
 903            int response, BOOL needResponse)
 904 {
 905         BOOL notified = FALSE;
 906
 907         struct visorchipset_bus_info *pBusInfo = findbus(&BusInfoList, busNo);
 908
 909         if (!pBusInfo)
 910                 return;
 911
 912         if (needResponse) {
 913                 memcpy(&pBusInfo->pending_msg_hdr, msgHdr,
 914                        sizeof(struct controlvm_message_header));
 915         } else
 916                 pBusInfo->pending_msg_hdr.id = CONTROLVM_INVALID;
 917
 918         down(&NotifierLock);
 919         if (response == CONTROLVM_RESP_SUCCESS) {
 920                 switch (cmd) {
 921                 case CONTROLVM_BUS_CREATE:
 922                         /* We can't tell from the bus_create
 923                         * information which of our 2 bus flavors the
 924                         * devices on this bus will ultimately end up.
 925                         * FORTUNATELY, it turns out it is harmless to
 926                         * send the bus_create to both of them.  We can
 927                         * narrow things down a little bit, though,
 928                         * because we know: - BusDev_Server can handle
 929                         * either server or client devices
 930                         * - BusDev_Client can handle ONLY client
 931                         * devices */
 932                         if (BusDev_Server_Notifiers.bus_create) {
 933                                 (*BusDev_Server_Notifiers.bus_create) (busNo);
 934                                 notified = TRUE;
 935                         }
 936                         if ((!pBusInfo->flags.server) /*client */ &&
 937                             BusDev_Client_Notifiers.bus_create) {
 938                                 (*BusDev_Client_Notifiers.bus_create) (busNo);
 939                                 notified = TRUE;
 940                         }
 941                         break;
 942                 case CONTROLVM_BUS_DESTROY:
 943                         if (BusDev_Server_Notifiers.bus_destroy) {
 944                                 (*BusDev_Server_Notifiers.bus_destroy) (busNo);
 945                                 notified = TRUE;
 946                         }
 947                         if ((!pBusInfo->flags.server) /*client */ &&
 948                             BusDev_Client_Notifiers.bus_destroy) {
 949                                 (*BusDev_Client_Notifiers.bus_destroy) (busNo);
 950                                 notified = TRUE;
 951                         }
 952                         break;
 953                 }
 954         }
 955         if (notified)
 956                 /* The callback function just called above is responsible
 957                  * for calling the appropriate visorchipset_busdev_responders
 958                  * function, which will call bus_responder()
 959                  */
 960                 ;
 961         else
 962                 bus_responder(cmd, busNo, response);
 963         up(&NotifierLock);
 964 }
 965
 966 static void
 967 device_epilog(u32 busNo, u32 devNo, struct spar_segment_state state, u32 cmd,
 968               struct controlvm_message_header *msgHdr, int response,
 969               BOOL needResponse, BOOL for_visorbus)
 970 {
 971         struct visorchipset_busdev_notifiers *notifiers = NULL;
 972         BOOL notified = FALSE;
 973
 974         struct visorchipset_device_info *pDevInfo =
 975                 finddevice(&DevInfoList, busNo, devNo);
 976         char *envp[] = {
 977                 "SPARSP_DIAGPOOL_PAUSED_STATE = 1",
 978                 NULL
 979         };
 980
 981         if (!pDevInfo)
 982                 return;
 983
 984         if (for_visorbus)
 985                 notifiers = &BusDev_Server_Notifiers;
 986         else
 987                 notifiers = &BusDev_Client_Notifiers;
 988         if (needResponse) {
 989                 memcpy(&pDevInfo->pending_msg_hdr, msgHdr,
 990                        sizeof(struct controlvm_message_header));
 991         } else
 992                 pDevInfo->pending_msg_hdr.id = CONTROLVM_INVALID;
 993
 994         down(&NotifierLock);
 995         if (response >= 0) {
 996                 switch (cmd) {
 997                 case CONTROLVM_DEVICE_CREATE:
 998                         if (notifiers->device_create) {
 999                                 (*notifiers->device_create) (busNo, devNo);
1000                                 notified = TRUE;
1001                         }
1002                         break;
1003                 case CONTROLVM_DEVICE_CHANGESTATE:
1004                         /* ServerReady / ServerRunning / SegmentStateRunning */
1005                         if (state.alive == segment_state_running.alive &&
1006                             state.operating ==
1007                                 segment_state_running.operating) {
1008                                 if (notifiers->device_resume) {
1009                                         (*notifiers->device_resume) (busNo,
1010                                                                      devNo);
1011                                         notified = TRUE;
1012                                 }
1013                         }
1014                         /* ServerNotReady / ServerLost / SegmentStateStandby */
1015                         else if (state.alive == segment_state_standby.alive &&
1016                                  state.operating ==
1017                                  segment_state_standby.operating) {
1018                                 /* technically this is standby case
1019                                  * where server is lost
1020                                  */
1021                                 if (notifiers->device_pause) {
1022                                         (*notifiers->device_pause) (busNo,
1023                                                                     devNo);
1024                                         notified = TRUE;
1025                                 }
1026                         } else if (state.alive == segment_state_paused.alive &&
1027                                    state.operating ==
1028                                    segment_state_paused.operating) {
1029                                 /* this is lite pause where channel is
1030                                  * still valid just 'pause' of it
1031                                  */
1032                                 if (busNo == g_diagpoolBusNo
1033                                     && devNo == g_diagpoolDevNo) {
1034                                         /* this will trigger the
1035                                          * diag_shutdown.sh script in
1036                                          * the visorchipset hotplug */
1037                                         kobject_uevent_env
1038                                             (&Visorchipset_platform_device.dev.
1039                                              kobj, KOBJ_ONLINE, envp);
1040                                 }
1041                         }
1042                         break;
1043                 case CONTROLVM_DEVICE_DESTROY:
1044                         if (notifiers->device_destroy) {
1045                                 (*notifiers->device_destroy) (busNo, devNo);
1046                                 notified = TRUE;
1047                         }
1048                         break;
1049                 }
1050         }
1051         if (notified)
1052                 /* The callback function just called above is responsible
1053                  * for calling the appropriate visorchipset_busdev_responders
1054                  * function, which will call device_responder()
1055                  */
1056                 ;
1057         else
1058                 device_responder(cmd, busNo, devNo, response);
1059         up(&NotifierLock);
1060 }
1061
1062 static void
1063 bus_create(struct controlvm_message *inmsg)
1064 {
1065         struct controlvm_message_packet *cmd = &inmsg->cmd;
1066         ulong busNo = cmd->create_bus.bus_no;
1067         int rc = CONTROLVM_RESP_SUCCESS;
1068         struct visorchipset_bus_info *pBusInfo = NULL;
1069
1070
1071         pBusInfo = findbus(&BusInfoList, busNo);
1072         if (pBusInfo && (pBusInfo->state.created == 1)) {
1073                 POSTCODE_LINUX_3(BUS_CREATE_FAILURE_PC, busNo,
1074                                  POSTCODE_SEVERITY_ERR);
1075                 rc = -CONTROLVM_RESP_ERROR_ALREADY_DONE;
1076                 goto Away;
1077         }
1078         pBusInfo = kzalloc(sizeof(struct visorchipset_bus_info), GFP_KERNEL);
1079         if (pBusInfo == NULL) {
1080                 POSTCODE_LINUX_3(BUS_CREATE_FAILURE_PC, busNo,
1081                                  POSTCODE_SEVERITY_ERR);
1082                 rc = -CONTROLVM_RESP_ERROR_KMALLOC_FAILED;
1083                 goto Away;
1084         }
1085
1086         INIT_LIST_HEAD(&pBusInfo->entry);
1087         pBusInfo->bus_no = busNo;
1088         pBusInfo->dev_no = cmd->create_bus.dev_count;
1089
1090         POSTCODE_LINUX_3(BUS_CREATE_ENTRY_PC, busNo, POSTCODE_SEVERITY_INFO);
1091
1092         if (inmsg->hdr.flags.test_message == 1)
1093                 pBusInfo->chan_info.addr_type = ADDRTYPE_LOCALTEST;
1094         else
1095                 pBusInfo->chan_info.addr_type = ADDRTYPE_LOCALPHYSICAL;
1096
1097         pBusInfo->flags.server = inmsg->hdr.flags.server;
1098         pBusInfo->chan_info.channel_addr = cmd->create_bus.channel_addr;
1099         pBusInfo->chan_info.n_channel_bytes = cmd->create_bus.channel_bytes;
1100         pBusInfo->chan_info.channel_type_uuid =
1101                         cmd->create_bus.bus_data_type_uuid;
1102         pBusInfo->chan_info.channel_inst_uuid = cmd->create_bus.bus_inst_uuid;
1103
1104         list_add(&pBusInfo->entry, &BusInfoList);
1105
1106         POSTCODE_LINUX_3(BUS_CREATE_EXIT_PC, busNo, POSTCODE_SEVERITY_INFO);
1107
1108 Away:
1109         bus_epilog(busNo, CONTROLVM_BUS_CREATE, &inmsg->hdr,
1110                    rc, inmsg->hdr.flags.response_expected == 1);
1111 }
1112
1113 static void
1114 bus_destroy(struct controlvm_message *inmsg)
1115 {
1116         struct controlvm_message_packet *cmd = &inmsg->cmd;
1117         ulong busNo = cmd->destroy_bus.bus_no;
1118         struct visorchipset_bus_info *pBusInfo;
1119         int rc = CONTROLVM_RESP_SUCCESS;
1120
1121         pBusInfo = findbus(&BusInfoList, busNo);
1122         if (!pBusInfo) {
1123                 rc = -CONTROLVM_RESP_ERROR_BUS_INVALID;
1124                 goto Away;
1125         }
1126         if (pBusInfo->state.created == 0) {
1127                 rc = -CONTROLVM_RESP_ERROR_ALREADY_DONE;
1128                 goto Away;
1129         }
1130
1131 Away:
1132         bus_epilog(busNo, CONTROLVM_BUS_DESTROY, &inmsg->hdr,
1133                    rc, inmsg->hdr.flags.response_expected == 1);
1134 }
1135
1136 static void
1137 bus_configure(struct controlvm_message *inmsg, PARSER_CONTEXT *parser_ctx)
1138 {
1139         struct controlvm_message_packet *cmd = &inmsg->cmd;
1140         ulong busNo = cmd->configure_bus.bus_no;
1141         struct visorchipset_bus_info *pBusInfo = NULL;
1142         int rc = CONTROLVM_RESP_SUCCESS;
1143         char s[99];
1144
1145         busNo = cmd->configure_bus.bus_no;
1146         POSTCODE_LINUX_3(BUS_CONFIGURE_ENTRY_PC, busNo, POSTCODE_SEVERITY_INFO);
1147
1148         pBusInfo = findbus(&BusInfoList, busNo);
1149         if (!pBusInfo) {
1150                 POSTCODE_LINUX_3(BUS_CONFIGURE_FAILURE_PC, busNo,
1151                                  POSTCODE_SEVERITY_ERR);
1152                 rc = -CONTROLVM_RESP_ERROR_BUS_INVALID;
1153                 goto Away;
1154         }
1155         if (pBusInfo->state.created == 0) {
1156                 POSTCODE_LINUX_3(BUS_CONFIGURE_FAILURE_PC, busNo,
1157                                  POSTCODE_SEVERITY_ERR);
1158                 rc = -CONTROLVM_RESP_ERROR_BUS_INVALID;
1159                 goto Away;
1160         }
1161         /* TBD - add this check to other commands also... */
1162         if (pBusInfo->pending_msg_hdr.id != CONTROLVM_INVALID) {
1163                 POSTCODE_LINUX_3(BUS_CONFIGURE_FAILURE_PC, busNo,
1164                                  POSTCODE_SEVERITY_ERR);
1165                 rc = -CONTROLVM_RESP_ERROR_MESSAGE_ID_INVALID_FOR_CLIENT;
1166                 goto Away;
1167         }
1168
1169         pBusInfo->partition_handle = cmd->configure_bus.guest_handle;
1170         pBusInfo->partition_uuid = parser_id_get(parser_ctx);
1171         parser_param_start(parser_ctx, PARSERSTRING_NAME);
1172         pBusInfo->name = parser_string_get(parser_ctx);
1173
1174         visorchannel_uuid_id(&pBusInfo->partition_uuid, s);
1175         POSTCODE_LINUX_3(BUS_CONFIGURE_EXIT_PC, busNo, POSTCODE_SEVERITY_INFO);
1176 Away:
1177         bus_epilog(busNo, CONTROLVM_BUS_CONFIGURE, &inmsg->hdr,
1178                    rc, inmsg->hdr.flags.response_expected == 1);
1179 }
1180
1181 static void
1182 my_device_create(struct controlvm_message *inmsg)
1183 {
1184         struct controlvm_message_packet *cmd = &inmsg->cmd;
1185         ulong busNo = cmd->create_device.bus_no;
1186         ulong devNo = cmd->create_device.dev_no;
1187         struct visorchipset_device_info *pDevInfo = NULL;
1188         struct visorchipset_bus_info *pBusInfo = NULL;
1189         int rc = CONTROLVM_RESP_SUCCESS;
1190
1191         pDevInfo = finddevice(&DevInfoList, busNo, devNo);
1192         if (pDevInfo && (pDevInfo->state.created == 1)) {
1193                 POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, devNo, busNo,
1194                                  POSTCODE_SEVERITY_ERR);
1195                 rc = -CONTROLVM_RESP_ERROR_ALREADY_DONE;
1196                 goto Away;
1197         }
1198         pBusInfo = findbus(&BusInfoList, busNo);
1199         if (!pBusInfo) {
1200                 POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, devNo, busNo,
1201                                  POSTCODE_SEVERITY_ERR);
1202                 rc = -CONTROLVM_RESP_ERROR_BUS_INVALID;
1203                 goto Away;
1204         }
1205         if (pBusInfo->state.created == 0) {
1206                 POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, devNo, busNo,
1207                                  POSTCODE_SEVERITY_ERR);
1208                 rc = -CONTROLVM_RESP_ERROR_BUS_INVALID;
1209                 goto Away;
1210         }
1211         pDevInfo = kzalloc(sizeof(struct visorchipset_device_info), GFP_KERNEL);
1212         if (pDevInfo == NULL) {
1213                 POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, devNo, busNo,
1214                                  POSTCODE_SEVERITY_ERR);
1215                 rc = -CONTROLVM_RESP_ERROR_KMALLOC_FAILED;
1216                 goto Away;
1217         }
1218
1219         INIT_LIST_HEAD(&pDevInfo->entry);
1220         pDevInfo->bus_no = busNo;
1221         pDevInfo->dev_no = devNo;
1222         pDevInfo->dev_inst_uuid = cmd->create_device.dev_inst_uuid;
1223         POSTCODE_LINUX_4(DEVICE_CREATE_ENTRY_PC, devNo, busNo,
1224                          POSTCODE_SEVERITY_INFO);
1225
1226         if (inmsg->hdr.flags.test_message == 1)
1227                 pDevInfo->chan_info.addr_type = ADDRTYPE_LOCALTEST;
1228         else
1229                 pDevInfo->chan_info.addr_type = ADDRTYPE_LOCALPHYSICAL;
1230         pDevInfo->chan_info.channel_addr = cmd->create_device.channel_addr;
1231         pDevInfo->chan_info.n_channel_bytes = cmd->create_device.channel_bytes;
1232         pDevInfo->chan_info.channel_type_uuid =
1233                         cmd->create_device.data_type_uuid;
1234         pDevInfo->chan_info.intr = cmd->create_device.intr;
1235         list_add(&pDevInfo->entry, &DevInfoList);
1236         POSTCODE_LINUX_4(DEVICE_CREATE_EXIT_PC, devNo, busNo,
1237                          POSTCODE_SEVERITY_INFO);
1238 Away:
1239         /* get the bus and devNo for DiagPool channel */
1240         if (pDevInfo &&
1241             is_diagpool_channel(pDevInfo->chan_info.channel_type_uuid)) {
1242                 g_diagpoolBusNo = busNo;
1243                 g_diagpoolDevNo = devNo;
1244         }
1245         device_epilog(busNo, devNo, segment_state_running,
1246                       CONTROLVM_DEVICE_CREATE, &inmsg->hdr, rc,
1247                       inmsg->hdr.flags.response_expected == 1,
1248                       FOR_VISORBUS(pDevInfo->chan_info.channel_type_uuid));
1249 }
1250
1251 static void
1252 my_device_changestate(struct controlvm_message *inmsg)
1253 {
1254         struct controlvm_message_packet *cmd = &inmsg->cmd;
1255         ulong busNo = cmd->device_change_state.bus_no;
1256         ulong devNo = cmd->device_change_state.dev_no;
1257         struct spar_segment_state state = cmd->device_change_state.state;
1258         struct visorchipset_device_info *pDevInfo = NULL;
1259         int rc = CONTROLVM_RESP_SUCCESS;
1260
1261         pDevInfo = finddevice(&DevInfoList, busNo, devNo);
1262         if (!pDevInfo) {
1263                 POSTCODE_LINUX_4(DEVICE_CHANGESTATE_FAILURE_PC, devNo, busNo,
1264                                  POSTCODE_SEVERITY_ERR);
1265                 rc = -CONTROLVM_RESP_ERROR_DEVICE_INVALID;
1266                 goto Away;
1267         }
1268         if (pDevInfo->state.created == 0) {
1269                 POSTCODE_LINUX_4(DEVICE_CHANGESTATE_FAILURE_PC, devNo, busNo,
1270                                  POSTCODE_SEVERITY_ERR);
1271                 rc = -CONTROLVM_RESP_ERROR_DEVICE_INVALID;
1272         }
1273 Away:
1274         if ((rc >= CONTROLVM_RESP_SUCCESS) && pDevInfo)
1275                 device_epilog(busNo, devNo, state, CONTROLVM_DEVICE_CHANGESTATE,
1276                               &inmsg->hdr, rc,
1277                               inmsg->hdr.flags.response_expected == 1,
1278                               FOR_VISORBUS(
1279                                         pDevInfo->chan_info.channel_type_uuid));
1280 }
1281
1282 static void
1283 my_device_destroy(struct controlvm_message *inmsg)
1284 {
1285         struct controlvm_message_packet *cmd = &inmsg->cmd;
1286         ulong busNo = cmd->destroy_device.bus_no;
1287         ulong devNo = cmd->destroy_device.dev_no;
1288         struct visorchipset_device_info *pDevInfo = NULL;
1289         int rc = CONTROLVM_RESP_SUCCESS;
1290
1291         pDevInfo = finddevice(&DevInfoList, busNo, devNo);
1292         if (!pDevInfo) {
1293                 rc = -CONTROLVM_RESP_ERROR_DEVICE_INVALID;
1294                 goto Away;
1295         }
1296         if (pDevInfo->state.created == 0) {
1297                 rc = -CONTROLVM_RESP_ERROR_ALREADY_DONE;
1298         }
1299
1300 Away:
1301         if ((rc >= CONTROLVM_RESP_SUCCESS) && pDevInfo)
1302                 device_epilog(busNo, devNo, segment_state_running,
1303                               CONTROLVM_DEVICE_DESTROY, &inmsg->hdr, rc,
1304                               inmsg->hdr.flags.response_expected == 1,
1305                               FOR_VISORBUS(
1306                                         pDevInfo->chan_info.channel_type_uuid));
1307 }
1308
1309 /* When provided with the physical address of the controlvm channel
1310  * (phys_addr), the offset to the payload area we need to manage
1311  * (offset), and the size of this payload area (bytes), fills in the
1312  * controlvm_payload_info struct.  Returns TRUE for success or FALSE
1313  * for failure.
1314  */
1315 static int
1316 initialize_controlvm_payload_info(HOSTADDRESS phys_addr, u64 offset, u32 bytes,
1317                                   struct controlvm_payload_info *info)
1318 {
1319         u8 __iomem *payload = NULL;
1320         int rc = CONTROLVM_RESP_SUCCESS;
1321
1322         if (info == NULL) {
1323                 rc = -CONTROLVM_RESP_ERROR_PAYLOAD_INVALID;
1324                 goto Away;
1325         }
1326         memset(info, 0, sizeof(struct controlvm_payload_info));
1327         if ((offset == 0) || (bytes == 0)) {
1328                 rc = -CONTROLVM_RESP_ERROR_PAYLOAD_INVALID;
1329                 goto Away;
1330         }
1331         payload = ioremap_cache(phys_addr + offset, bytes);
1332         if (payload == NULL) {
1333                 rc = -CONTROLVM_RESP_ERROR_IOREMAP_FAILED;
1334                 goto Away;
1335         }
1336
1337         info->offset = offset;
1338         info->bytes = bytes;
1339         info->ptr = payload;
1340
1341 Away:
1342         if (rc < 0) {
1343                 if (payload != NULL) {
1344                         iounmap(payload);
1345                         payload = NULL;
1346                 }
1347         }
1348         return rc;
1349 }
1350
1351 static void
1352 destroy_controlvm_payload_info(struct controlvm_payload_info *info)
1353 {
1354         if (info->ptr != NULL) {
1355                 iounmap(info->ptr);
1356                 info->ptr = NULL;
1357         }
1358         memset(info, 0, sizeof(struct controlvm_payload_info));
1359 }
1360
1361 static void
1362 initialize_controlvm_payload(void)
1363 {
1364         HOSTADDRESS phys_addr = visorchannel_get_physaddr(ControlVm_channel);
1365         u64 payloadOffset = 0;
1366         u32 payloadBytes = 0;
1367
1368         if (visorchannel_read(ControlVm_channel,
1369                               offsetof(struct spar_controlvm_channel_protocol,
1370                                        request_payload_offset),
1371                               &payloadOffset, sizeof(payloadOffset)) < 0) {
1372                 POSTCODE_LINUX_2(CONTROLVM_INIT_FAILURE_PC,
1373                                  POSTCODE_SEVERITY_ERR);
1374                 return;
1375         }
1376         if (visorchannel_read(ControlVm_channel,
1377                               offsetof(struct spar_controlvm_channel_protocol,
1378                                        request_payload_bytes),
1379                               &payloadBytes, sizeof(payloadBytes)) < 0) {
1380                 POSTCODE_LINUX_2(CONTROLVM_INIT_FAILURE_PC,
1381                                  POSTCODE_SEVERITY_ERR);
1382                 return;
1383         }
1384         initialize_controlvm_payload_info(phys_addr,
1385                                           payloadOffset, payloadBytes,
1386                                           &ControlVm_payload_info);
1387 }
1388
1389 /*  Send ACTION=online for DEVPATH=/sys/devices/platform/visorchipset.
1390  *  Returns CONTROLVM_RESP_xxx code.
1391  */
1392 int
1393 visorchipset_chipset_ready(void)
1394 {
1395         kobject_uevent(&Visorchipset_platform_device.dev.kobj, KOBJ_ONLINE);
1396         return CONTROLVM_RESP_SUCCESS;
1397 }
1398 EXPORT_SYMBOL_GPL(visorchipset_chipset_ready);
1399
1400 int
1401 visorchipset_chipset_selftest(void)
1402 {
1403         char env_selftest[20];
1404         char *envp[] = { env_selftest, NULL };
1405
1406         sprintf(env_selftest, "SPARSP_SELFTEST=%d", 1);
1407         kobject_uevent_env(&Visorchipset_platform_device.dev.kobj, KOBJ_CHANGE,
1408                            envp);
1409         return CONTROLVM_RESP_SUCCESS;
1410 }
1411 EXPORT_SYMBOL_GPL(visorchipset_chipset_selftest);
1412
1413 /*  Send ACTION=offline for DEVPATH=/sys/devices/platform/visorchipset.
1414  *  Returns CONTROLVM_RESP_xxx code.
1415  */
1416 int
1417 visorchipset_chipset_notready(void)
1418 {
1419         kobject_uevent(&Visorchipset_platform_device.dev.kobj, KOBJ_OFFLINE);
1420         return CONTROLVM_RESP_SUCCESS;
1421 }
1422 EXPORT_SYMBOL_GPL(visorchipset_chipset_notready);
1423
1424 static void
1425 chipset_ready(struct controlvm_message_header *msgHdr)
1426 {
1427         int rc = visorchipset_chipset_ready();
1428
1429         if (rc != CONTROLVM_RESP_SUCCESS)
1430                 rc = -rc;
1431         if (msgHdr->flags.response_expected && !visorchipset_holdchipsetready)
1432                 controlvm_respond(msgHdr, rc);
1433         if (msgHdr->flags.response_expected && visorchipset_holdchipsetready) {
1434                 /* Send CHIPSET_READY response when all modules have been loaded
1435                  * and disks mounted for the partition
1436                  */
1437                 g_ChipSetMsgHdr = *msgHdr;
1438         }
1439 }
1440
1441 static void
1442 chipset_selftest(struct controlvm_message_header *msgHdr)
1443 {
1444         int rc = visorchipset_chipset_selftest();
1445
1446         if (rc != CONTROLVM_RESP_SUCCESS)
1447                 rc = -rc;
1448         if (msgHdr->flags.response_expected)
1449                 controlvm_respond(msgHdr, rc);
1450 }
1451
1452 static void
1453 chipset_notready(struct controlvm_message_header *msgHdr)
1454 {
1455         int rc = visorchipset_chipset_notready();
1456
1457         if (rc != CONTROLVM_RESP_SUCCESS)
1458                 rc = -rc;
1459         if (msgHdr->flags.response_expected)
1460                 controlvm_respond(msgHdr, rc);
1461 }
1462
1463 /* This is your "one-stop" shop for grabbing the next message from the
1464  * CONTROLVM_QUEUE_EVENT queue in the controlvm channel.
1465  */
1466 static BOOL
1467 read_controlvm_event(struct controlvm_message *msg)
1468 {
1469         if (visorchannel_signalremove(ControlVm_channel,
1470                                       CONTROLVM_QUEUE_EVENT, msg)) {
1471                 /* got a message */
1472                 if (msg->hdr.flags.test_message == 1)
1473                         return FALSE;
1474                 return TRUE;
1475         }
1476         return FALSE;
1477 }
1478
1479 /*
1480  * The general parahotplug flow works as follows.  The visorchipset
1481  * driver receives a DEVICE_CHANGESTATE message from Command
1482  * specifying a physical device to enable or disable.  The CONTROLVM
1483  * message handler calls parahotplug_process_message, which then adds
1484  * the message to a global list and kicks off a udev event which
1485  * causes a user level script to enable or disable the specified
1486  * device.  The udev script then writes to
1487  * /proc/visorchipset/parahotplug, which causes parahotplug_proc_write
1488  * to get called, at which point the appropriate CONTROLVM message is
1489  * retrieved from the list and responded to.
1490  */
1491
1492 #define PARAHOTPLUG_TIMEOUT_MS 2000
1493
1494 /*
1495  * Generate unique int to match an outstanding CONTROLVM message with a
1496  * udev script /proc response
1497  */
1498 static int
1499 parahotplug_next_id(void)
1500 {
1501         static atomic_t id = ATOMIC_INIT(0);
1502
1503         return atomic_inc_return(&id);
1504 }
1505
1506 /*
1507  * Returns the time (in jiffies) when a CONTROLVM message on the list
1508  * should expire -- PARAHOTPLUG_TIMEOUT_MS in the future
1509  */
1510 static unsigned long
1511 parahotplug_next_expiration(void)
1512 {
1513         return jiffies + msecs_to_jiffies(PARAHOTPLUG_TIMEOUT_MS);
1514 }
1515
1516 /*
1517  * Create a parahotplug_request, which is basically a wrapper for a
1518  * CONTROLVM_MESSAGE that we can stick on a list
1519  */
1520 static struct parahotplug_request *
1521 parahotplug_request_create(struct controlvm_message *msg)
1522 {
1523         struct parahotplug_request *req;
1524
1525         req = kmalloc(sizeof(*req), GFP_KERNEL|__GFP_NORETRY);
1526         if (req == NULL)
1527                 return NULL;
1528
1529         req->id = parahotplug_next_id();
1530         req->expiration = parahotplug_next_expiration();
1531         req->msg = *msg;
1532
1533         return req;
1534 }
1535
1536 /*
1537  * Free a parahotplug_request.
1538  */
1539 static void
1540 parahotplug_request_destroy(struct parahotplug_request *req)
1541 {
1542         kfree(req);
1543 }
1544
1545 /*
1546  * Cause uevent to run the user level script to do the disable/enable
1547  * specified in (the CONTROLVM message in) the specified
1548  * parahotplug_request
1549  */
1550 static void
1551 parahotplug_request_kickoff(struct parahotplug_request *req)
1552 {
1553         struct controlvm_message_packet *cmd = &req->msg.cmd;
1554         char env_cmd[40], env_id[40], env_state[40], env_bus[40], env_dev[40],
1555             env_func[40];
1556         char *envp[] = {
1557                 env_cmd, env_id, env_state, env_bus, env_dev, env_func, NULL
1558         };
1559
1560         sprintf(env_cmd, "SPAR_PARAHOTPLUG=1");
1561         sprintf(env_id, "SPAR_PARAHOTPLUG_ID=%d", req->id);
1562         sprintf(env_state, "SPAR_PARAHOTPLUG_STATE=%d",
1563                 cmd->device_change_state.state.active);
1564         sprintf(env_bus, "SPAR_PARAHOTPLUG_BUS=%d",
1565                 cmd->device_change_state.bus_no);
1566         sprintf(env_dev, "SPAR_PARAHOTPLUG_DEVICE=%d",
1567                 cmd->device_change_state.dev_no >> 3);
1568         sprintf(env_func, "SPAR_PARAHOTPLUG_FUNCTION=%d",
1569                 cmd->device_change_state.dev_no & 0x7);
1570
1571         kobject_uevent_env(&Visorchipset_platform_device.dev.kobj, KOBJ_CHANGE,
1572                            envp);
1573 }
1574
1575 /*
1576  * Remove any request from the list that's been on there too long and
1577  * respond with an error.
1578  */
1579 static void
1580 parahotplug_process_list(void)
1581 {
1582         struct list_head *pos = NULL;
1583         struct list_head *tmp = NULL;
1584
1585         spin_lock(&Parahotplug_request_list_lock);
1586
1587         list_for_each_safe(pos, tmp, &Parahotplug_request_list) {
1588                 struct parahotplug_request *req =
1589                     list_entry(pos, struct parahotplug_request, list);
1590                 if (time_after_eq(jiffies, req->expiration)) {
1591                         list_del(pos);
1592                         if (req->msg.hdr.flags.response_expected)
1593                                 controlvm_respond_physdev_changestate(
1594                                         &req->msg.hdr,
1595                                         CONTROLVM_RESP_ERROR_DEVICE_UDEV_TIMEOUT,
1596                                         req->msg.cmd.device_change_state.state);
1597                         parahotplug_request_destroy(req);
1598                 }
1599         }
1600
1601         spin_unlock(&Parahotplug_request_list_lock);
1602 }
1603
1604 /*
1605  * Called from the /proc handler, which means the user script has
1606  * finished the enable/disable.  Find the matching identifier, and
1607  * respond to the CONTROLVM message with success.
1608  */
1609 static int
1610 parahotplug_request_complete(int id, u16 active)
1611 {
1612         struct list_head *pos = NULL;
1613         struct list_head *tmp = NULL;
1614
1615         spin_lock(&Parahotplug_request_list_lock);
1616
1617         /* Look for a request matching "id". */
1618         list_for_each_safe(pos, tmp, &Parahotplug_request_list) {
1619                 struct parahotplug_request *req =
1620                     list_entry(pos, struct parahotplug_request, list);
1621                 if (req->id == id) {
1622                         /* Found a match.  Remove it from the list and
1623                          * respond.
1624                          */
1625                         list_del(pos);
1626                         spin_unlock(&Parahotplug_request_list_lock);
1627                         req->msg.cmd.device_change_state.state.active = active;
1628                         if (req->msg.hdr.flags.response_expected)
1629                                 controlvm_respond_physdev_changestate(
1630                                         &req->msg.hdr, CONTROLVM_RESP_SUCCESS,
1631                                         req->msg.cmd.device_change_state.state);
1632                         parahotplug_request_destroy(req);
1633                         return 0;
1634                 }
1635         }
1636
1637         spin_unlock(&Parahotplug_request_list_lock);
1638         return -1;
1639 }
1640
1641 /*
1642  * Enables or disables a PCI device by kicking off a udev script
1643  */
1644 static void
1645 parahotplug_process_message(struct controlvm_message *inmsg)
1646 {
1647         struct parahotplug_request *req;
1648
1649         req = parahotplug_request_create(inmsg);
1650
1651         if (req == NULL)
1652                 return;
1653
1654         if (inmsg->cmd.device_change_state.state.active) {
1655                 /* For enable messages, just respond with success
1656                 * right away.  This is a bit of a hack, but there are
1657                 * issues with the early enable messages we get (with
1658                 * either the udev script not detecting that the device
1659                 * is up, or not getting called at all).  Fortunately
1660                 * the messages that get lost don't matter anyway, as
1661                 * devices are automatically enabled at
1662                 * initialization.
1663                 */
1664                 parahotplug_request_kickoff(req);
1665                 controlvm_respond_physdev_changestate(&inmsg->hdr,
1666                                 CONTROLVM_RESP_SUCCESS, inmsg->cmd.
1667                                 device_change_state.state);
1668                 parahotplug_request_destroy(req);
1669         } else {
1670                 /* For disable messages, add the request to the
1671                 * request list before kicking off the udev script.  It
1672                 * won't get responded to until the script has
1673                 * indicated it's done.
1674                 */
1675                 spin_lock(&Parahotplug_request_list_lock);
1676                 list_add_tail(&(req->list), &Parahotplug_request_list);
1677                 spin_unlock(&Parahotplug_request_list_lock);
1678
1679                 parahotplug_request_kickoff(req);
1680         }
1681 }
1682
1683 /* Process a controlvm message.
1684  * Return result:
1685  *    FALSE - this function will return FALSE only in the case where the
1686  *            controlvm message was NOT processed, but processing must be
1687  *            retried before reading the next controlvm message; a
1688  *            scenario where this can occur is when we need to throttle
1689  *            the allocation of memory in which to copy out controlvm
1690  *            payload data
1691  *    TRUE  - processing of the controlvm message completed,
1692  *            either successfully or with an error.
1693  */
1694 static BOOL
1695 handle_command(struct controlvm_message inmsg, HOSTADDRESS channel_addr)
1696 {
1697         struct controlvm_message_packet *cmd = &inmsg.cmd;
1698         u64 parametersAddr = 0;
1699         u32 parametersBytes = 0;
1700         PARSER_CONTEXT *parser_ctx = NULL;
1701         BOOL isLocalAddr = FALSE;
1702         struct controlvm_message ackmsg;
1703
1704         /* create parsing context if necessary */
1705         isLocalAddr = (inmsg.hdr.flags.test_message == 1);
1706         if (channel_addr == 0)
1707                 return TRUE;
1708         parametersAddr = channel_addr + inmsg.hdr.payload_vm_offset;
1709         parametersBytes = inmsg.hdr.payload_bytes;
1710
1711         /* Parameter and channel addresses within test messages actually lie
1712          * within our OS-controlled memory.  We need to know that, because it
1713          * makes a difference in how we compute the virtual address.
1714          */
1715         if (parametersAddr != 0 && parametersBytes != 0) {
1716                 BOOL retry = FALSE;
1717
1718                 parser_ctx =
1719                     parser_init_byteStream(parametersAddr, parametersBytes,
1720                                            isLocalAddr, &retry);
1721                 if (!parser_ctx && retry)
1722                         return FALSE;
1723         }
1724
1725         if (!isLocalAddr) {
1726                 controlvm_init_response(&ackmsg, &inmsg.hdr,
1727                                         CONTROLVM_RESP_SUCCESS);
1728                 if (ControlVm_channel)
1729                         visorchannel_signalinsert(ControlVm_channel,
1730                                                   CONTROLVM_QUEUE_ACK,
1731                                                   &ackmsg);
1732         }
1733         switch (inmsg.hdr.id) {
1734         case CONTROLVM_CHIPSET_INIT:
1735                 chipset_init(&inmsg);
1736                 break;
1737         case CONTROLVM_BUS_CREATE:
1738                 bus_create(&inmsg);
1739                 break;
1740         case CONTROLVM_BUS_DESTROY:
1741                 bus_destroy(&inmsg);
1742                 break;
1743         case CONTROLVM_BUS_CONFIGURE:
1744                 bus_configure(&inmsg, parser_ctx);
1745                 break;
1746         case CONTROLVM_DEVICE_CREATE:
1747                 my_device_create(&inmsg);
1748                 break;
1749         case CONTROLVM_DEVICE_CHANGESTATE:
1750                 if (cmd->device_change_state.flags.phys_device) {
1751                         parahotplug_process_message(&inmsg);
1752                 } else {
1753                         /* save the hdr and cmd structures for later use */
1754                         /* when sending back the response to Command */
1755                         my_device_changestate(&inmsg);
1756                         g_DiagMsgHdr = inmsg.hdr;
1757                         g_DeviceChangeStatePacket = inmsg.cmd;
1758                         break;
1759                 }
1760                 break;
1761         case CONTROLVM_DEVICE_DESTROY:
1762                 my_device_destroy(&inmsg);
1763                 break;
1764         case CONTROLVM_DEVICE_CONFIGURE:
1765                 /* no op for now, just send a respond that we passed */
1766                 if (inmsg.hdr.flags.response_expected)
1767                         controlvm_respond(&inmsg.hdr, CONTROLVM_RESP_SUCCESS);
1768                 break;
1769         case CONTROLVM_CHIPSET_READY:
1770                 chipset_ready(&inmsg.hdr);
1771                 break;
1772         case CONTROLVM_CHIPSET_SELFTEST:
1773                 chipset_selftest(&inmsg.hdr);
1774                 break;
1775         case CONTROLVM_CHIPSET_STOP:
1776                 chipset_notready(&inmsg.hdr);
1777                 break;
1778         default:
1779                 if (inmsg.hdr.flags.response_expected)
1780                         controlvm_respond(&inmsg.hdr,
1781                                           -CONTROLVM_RESP_ERROR_MESSAGE_ID_UNKNOWN);
1782                 break;
1783         }
1784
1785         if (parser_ctx != NULL) {
1786                 parser_done(parser_ctx);
1787                 parser_ctx = NULL;
1788         }
1789         return TRUE;
1790 }
1791
1792 static HOSTADDRESS controlvm_get_channel_address(void)
1793 {
1794         u64 addr = 0;
1795         u32 size = 0;
1796
1797         if (!VMCALL_SUCCESSFUL(issue_vmcall_io_controlvm_addr(&addr, &size)))
1798                 return 0;
1799
1800         return addr;
1801 }
1802
1803 static void
1804 controlvm_periodic_work(struct work_struct *work)
1805 {
1806         struct controlvm_message inmsg;
1807         BOOL gotACommand = FALSE;
1808         BOOL handle_command_failed = FALSE;
1809         static u64 Poll_Count;
1810
1811         /* make sure visorbus server is registered for controlvm callbacks */
1812         if (visorchipset_serverregwait && !serverregistered)
1813                 goto Away;
1814         /* make sure visorclientbus server is regsitered for controlvm
1815          * callbacks
1816          */
1817         if (visorchipset_clientregwait && !clientregistered)
1818                 goto Away;
1819
1820         Poll_Count++;
1821         if (Poll_Count >= 250)
1822                 ;       /* keep going */
1823         else
1824                 goto Away;
1825
1826         /* Check events to determine if response to CHIPSET_READY
1827          * should be sent
1828          */
1829         if (visorchipset_holdchipsetready
1830             && (g_ChipSetMsgHdr.id != CONTROLVM_INVALID)) {
1831                 if (check_chipset_events() == 1) {
1832                         controlvm_respond(&g_ChipSetMsgHdr, 0);
1833                         clear_chipset_events();
1834                         memset(&g_ChipSetMsgHdr, 0,
1835                                sizeof(struct controlvm_message_header));
1836                 }
1837         }
1838
1839         while (visorchannel_signalremove(ControlVm_channel,
1840                                          CONTROLVM_QUEUE_RESPONSE,
1841                                          &inmsg)) {
1842         }
1843         if (!gotACommand) {
1844                 if (ControlVm_Pending_Msg_Valid) {
1845                         /* we throttled processing of a prior
1846                         * msg, so try to process it again
1847                         * rather than reading a new one
1848                         */
1849                         inmsg = ControlVm_Pending_Msg;
1850                         ControlVm_Pending_Msg_Valid = FALSE;
1851                         gotACommand = TRUE;
1852                 } else
1853                         gotACommand = read_controlvm_event(&inmsg);
1854         }
1855
1856         handle_command_failed = FALSE;
1857         while (gotACommand && (!handle_command_failed)) {
1858                 Most_recent_message_jiffies = jiffies;
1859                 if (handle_command(inmsg,
1860                                    visorchannel_get_physaddr
1861                                    (ControlVm_channel)))
1862                         gotACommand = read_controlvm_event(&inmsg);
1863                 else {
1864                         /* this is a scenario where throttling
1865                         * is required, but probably NOT an
1866                         * error...; we stash the current
1867                         * controlvm msg so we will attempt to
1868                         * reprocess it on our next loop
1869                         */
1870                         handle_command_failed = TRUE;
1871                         ControlVm_Pending_Msg = inmsg;
1872                         ControlVm_Pending_Msg_Valid = TRUE;
1873                 }
1874         }
1875
1876         /* parahotplug_worker */
1877         parahotplug_process_list();
1878
1879 Away:
1880
1881         if (time_after(jiffies,
1882                        Most_recent_message_jiffies + (HZ * MIN_IDLE_SECONDS))) {
1883                 /* it's been longer than MIN_IDLE_SECONDS since we
1884                 * processed our last controlvm message; slow down the
1885                 * polling
1886                 */
1887                 if (Poll_jiffies != POLLJIFFIES_CONTROLVMCHANNEL_SLOW) {
1888                         Poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_SLOW;
1889                 }
1890         } else {
1891                 if (Poll_jiffies != POLLJIFFIES_CONTROLVMCHANNEL_FAST) {
1892                         Poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_FAST;
1893                 }
1894         }
1895
1896         queue_delayed_work(Periodic_controlvm_workqueue,
1897                            &Periodic_controlvm_work, Poll_jiffies);
1898 }
1899
1900 static void
1901 setup_crash_devices_work_queue(struct work_struct *work)
1902 {
1903
1904         struct controlvm_message localCrashCreateBusMsg;
1905         struct controlvm_message localCrashCreateDevMsg;
1906         struct controlvm_message msg;
1907         u32 localSavedCrashMsgOffset;
1908         u16 localSavedCrashMsgCount;
1909
1910         /* make sure visorbus server is registered for controlvm callbacks */
1911         if (visorchipset_serverregwait && !serverregistered)
1912                 goto Away;
1913
1914         /* make sure visorclientbus server is regsitered for controlvm
1915          * callbacks
1916          */
1917         if (visorchipset_clientregwait && !clientregistered)
1918                 goto Away;
1919
1920         POSTCODE_LINUX_2(CRASH_DEV_ENTRY_PC, POSTCODE_SEVERITY_INFO);
1921
1922         /* send init chipset msg */
1923         msg.hdr.id = CONTROLVM_CHIPSET_INIT;
1924         msg.cmd.init_chipset.bus_count = 23;
1925         msg.cmd.init_chipset.switch_count = 0;
1926
1927         chipset_init(&msg);
1928
1929         /* get saved message count */
1930         if (visorchannel_read(ControlVm_channel,
1931                               offsetof(struct spar_controlvm_channel_protocol,
1932                                        saved_crash_message_count),
1933                               &localSavedCrashMsgCount, sizeof(u16)) < 0) {
1934                 POSTCODE_LINUX_2(CRASH_DEV_CTRL_RD_FAILURE_PC,
1935                                  POSTCODE_SEVERITY_ERR);
1936                 return;
1937         }
1938
1939         if (localSavedCrashMsgCount != CONTROLVM_CRASHMSG_MAX) {
1940                 POSTCODE_LINUX_3(CRASH_DEV_COUNT_FAILURE_PC,
1941                                  localSavedCrashMsgCount,
1942                                  POSTCODE_SEVERITY_ERR);
1943                 return;
1944         }
1945
1946         /* get saved crash message offset */
1947         if (visorchannel_read(ControlVm_channel,
1948                               offsetof(struct spar_controlvm_channel_protocol,
1949                                        saved_crash_message_offset),
1950                               &localSavedCrashMsgOffset, sizeof(u32)) < 0) {
1951                 POSTCODE_LINUX_2(CRASH_DEV_CTRL_RD_FAILURE_PC,
1952                                  POSTCODE_SEVERITY_ERR);
1953                 return;
1954         }
1955
1956         /* read create device message for storage bus offset */
1957         if (visorchannel_read(ControlVm_channel,
1958                               localSavedCrashMsgOffset,
1959                               &localCrashCreateBusMsg,
1960                               sizeof(struct controlvm_message)) < 0) {
1961                 POSTCODE_LINUX_2(CRASH_DEV_RD_BUS_FAIULRE_PC,
1962                                  POSTCODE_SEVERITY_ERR);
1963                 return;
1964         }
1965
1966         /* read create device message for storage device */
1967         if (visorchannel_read(ControlVm_channel,
1968                               localSavedCrashMsgOffset +
1969                               sizeof(struct controlvm_message),
1970                               &localCrashCreateDevMsg,
1971                               sizeof(struct controlvm_message)) < 0) {
1972                 POSTCODE_LINUX_2(CRASH_DEV_RD_DEV_FAIULRE_PC,
1973                                  POSTCODE_SEVERITY_ERR);
1974                 return;
1975         }
1976
1977         /* reuse IOVM create bus message */
1978         if (localCrashCreateBusMsg.cmd.create_bus.channel_addr != 0)
1979                 bus_create(&localCrashCreateBusMsg);
1980         else {
1981                 POSTCODE_LINUX_2(CRASH_DEV_BUS_NULL_FAILURE_PC,
1982                                  POSTCODE_SEVERITY_ERR);
1983                 return;
1984         }
1985
1986         /* reuse create device message for storage device */
1987         if (localCrashCreateDevMsg.cmd.create_device.channel_addr != 0)
1988                 my_device_create(&localCrashCreateDevMsg);
1989         else {
1990                 POSTCODE_LINUX_2(CRASH_DEV_DEV_NULL_FAILURE_PC,
1991                                  POSTCODE_SEVERITY_ERR);
1992                 return;
1993         }
1994         POSTCODE_LINUX_2(CRASH_DEV_EXIT_PC, POSTCODE_SEVERITY_INFO);
1995         return;
1996
1997 Away:
1998
1999         Poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_SLOW;
2000
2001         queue_delayed_work(Periodic_controlvm_workqueue,
2002                            &Periodic_controlvm_work, Poll_jiffies);
2003 }
2004
2005 static void
2006 bus_create_response(ulong busNo, int response)
2007 {
2008         bus_responder(CONTROLVM_BUS_CREATE, busNo, response);
2009 }
2010
2011 static void
2012 bus_destroy_response(ulong busNo, int response)
2013 {
2014         bus_responder(CONTROLVM_BUS_DESTROY, busNo, response);
2015 }
2016
2017 static void
2018 device_create_response(ulong busNo, ulong devNo, int response)
2019 {
2020         device_responder(CONTROLVM_DEVICE_CREATE, busNo, devNo, response);
2021 }
2022
2023 static void
2024 device_destroy_response(ulong busNo, ulong devNo, int response)
2025 {
2026         device_responder(CONTROLVM_DEVICE_DESTROY, busNo, devNo, response);
2027 }
2028
2029 void
2030 visorchipset_device_pause_response(ulong bus_no, ulong dev_no, int response)
2031 {
2032
2033         device_changestate_responder(CONTROLVM_DEVICE_CHANGESTATE,
2034                                      bus_no, dev_no, response,
2035                                      segment_state_standby);
2036 }
2037 EXPORT_SYMBOL_GPL(visorchipset_device_pause_response);
2038
2039 static void
2040 device_resume_response(ulong busNo, ulong devNo, int response)
2041 {
2042         device_changestate_responder(CONTROLVM_DEVICE_CHANGESTATE,
2043                                      busNo, devNo, response,
2044                                      segment_state_running);
2045 }
2046
2047 BOOL
2048 visorchipset_get_bus_info(ulong bus_no, struct visorchipset_bus_info *bus_info)
2049 {
2050         void *p = findbus(&BusInfoList, bus_no);
2051
2052         if (!p)
2053                 return FALSE;
2054         memcpy(bus_info, p, sizeof(struct visorchipset_bus_info));
2055         return TRUE;
2056 }
2057 EXPORT_SYMBOL_GPL(visorchipset_get_bus_info);
2058
2059 BOOL
2060 visorchipset_set_bus_context(ulong bus_no, void *context)
2061 {
2062         struct visorchipset_bus_info *p = findbus(&BusInfoList, bus_no);
2063
2064         if (!p)
2065                 return FALSE;
2066         p->bus_driver_context = context;
2067         return TRUE;
2068 }
2069 EXPORT_SYMBOL_GPL(visorchipset_set_bus_context);
2070
2071 BOOL
2072 visorchipset_get_device_info(ulong bus_no, ulong dev_no,
2073                              struct visorchipset_device_info *dev_info)
2074 {
2075         void *p = finddevice(&DevInfoList, bus_no, dev_no);
2076
2077         if (!p)
2078                 return FALSE;
2079         memcpy(dev_info, p, sizeof(struct visorchipset_device_info));
2080         return TRUE;
2081 }
2082 EXPORT_SYMBOL_GPL(visorchipset_get_device_info);
2083
2084 BOOL
2085 visorchipset_set_device_context(ulong bus_no, ulong dev_no, void *context)
2086 {
2087         struct visorchipset_device_info *p =
2088                         finddevice(&DevInfoList, bus_no, dev_no);
2089
2090         if (!p)
2091                 return FALSE;
2092         p->bus_driver_context = context;
2093         return TRUE;
2094 }
2095 EXPORT_SYMBOL_GPL(visorchipset_set_device_context);
2096
2097 /* Generic wrapper function for allocating memory from a kmem_cache pool.
2098  */
2099 void *
2100 visorchipset_cache_alloc(struct kmem_cache *pool, BOOL ok_to_block,
2101                          char *fn, int ln)
2102 {
2103         gfp_t gfp;
2104         void *p;
2105
2106         if (ok_to_block)
2107                 gfp = GFP_KERNEL;
2108         else
2109                 gfp = GFP_ATOMIC;
2110         /* __GFP_NORETRY means "ok to fail", meaning
2111          * kmem_cache_alloc() can return NULL, implying the caller CAN
2112          * cope with failure.  If you do NOT specify __GFP_NORETRY,
2113          * Linux will go to extreme measures to get memory for you
2114          * (like, invoke oom killer), which will probably cripple the
2115          * system.
2116          */
2117         gfp |= __GFP_NORETRY;
2118         p = kmem_cache_alloc(pool, gfp);
2119         if (!p)
2120                 return NULL;
2121
2122         atomic_inc(&Visorchipset_cache_buffers_in_use);
2123         return p;
2124 }
2125
2126 /* Generic wrapper function for freeing memory from a kmem_cache pool.
2127  */
2128 void
2129 visorchipset_cache_free(struct kmem_cache *pool, void *p, char *fn, int ln)
2130 {
2131         if (!p)
2132                 return;
2133
2134         atomic_dec(&Visorchipset_cache_buffers_in_use);
2135         kmem_cache_free(pool, p);
2136 }
2137
2138 static ssize_t chipsetready_store(struct device *dev,
2139         struct device_attribute *attr, const char *buf, size_t count)
2140 {
2141         char msgtype[64];
2142
2143         if (sscanf(buf, "%63s", msgtype) != 1)
2144                 return -EINVAL;
2145
2146         if (strcmp(msgtype, "CALLHOMEDISK_MOUNTED") == 0) {
2147                 chipset_events[0] = 1;
2148                 return count;
2149         } else if (strcmp(msgtype, "MODULES_LOADED") == 0) {
2150                 chipset_events[1] = 1;
2151                 return count;
2152         }
2153         return -EINVAL;
2154 }
2155
2156 /* The parahotplug/devicedisabled interface gets called by our support script
2157  * when an SR-IOV device has been shut down. The ID is passed to the script
2158  * and then passed back when the device has been removed.
2159  */
2160 static ssize_t devicedisabled_store(struct device *dev,
2161         struct device_attribute *attr, const char *buf, size_t count)
2162 {
2163         uint id;
2164
2165         if (kstrtouint(buf, 10, &id) != 0)
2166                 return -EINVAL;
2167
2168         parahotplug_request_complete(id, 0);
2169         return count;
2170 }
2171
2172 /* The parahotplug/deviceenabled interface gets called by our support script
2173  * when an SR-IOV device has been recovered. The ID is passed to the script
2174  * and then passed back when the device has been brought back up.
2175  */
2176 static ssize_t deviceenabled_store(struct device *dev,
2177         struct device_attribute *attr, const char *buf, size_t count)
2178 {
2179         uint id;
2180
2181         if (kstrtouint(buf, 10, &id) != 0)
2182                 return -EINVAL;
2183
2184         parahotplug_request_complete(id, 1);
2185         return count;
2186 }
2187
2188 static int __init
2189 visorchipset_init(void)
2190 {
2191         int rc = 0, x = 0;
2192         HOSTADDRESS addr;
2193
2194         if (!unisys_spar_platform)
2195                 return -ENODEV;
2196
2197         memset(&BusDev_Server_Notifiers, 0, sizeof(BusDev_Server_Notifiers));
2198         memset(&BusDev_Client_Notifiers, 0, sizeof(BusDev_Client_Notifiers));
2199         memset(&ControlVm_payload_info, 0, sizeof(ControlVm_payload_info));
2200         memset(&LiveDump_info, 0, sizeof(LiveDump_info));
2201         atomic_set(&LiveDump_info.buffers_in_use, 0);
2202
2203         if (visorchipset_testvnic) {
2204                 POSTCODE_LINUX_3(CHIPSET_INIT_FAILURE_PC, x, DIAG_SEVERITY_ERR);
2205                 rc = x;
2206                 goto Away;
2207         }
2208
2209         addr = controlvm_get_channel_address();
2210         if (addr != 0) {
2211                 ControlVm_channel =
2212                     visorchannel_create_with_lock
2213                     (addr,
2214                      sizeof(struct spar_controlvm_channel_protocol),
2215                      spar_controlvm_channel_protocol_uuid);
2216                 if (SPAR_CONTROLVM_CHANNEL_OK_CLIENT(
2217                                 visorchannel_get_header(ControlVm_channel))) {
2218                         initialize_controlvm_payload();
2219                 } else {
2220                         visorchannel_destroy(ControlVm_channel);
2221                         ControlVm_channel = NULL;
2222                         return -ENODEV;
2223                 }
2224         } else {
2225                 return -ENODEV;
2226         }
2227
2228         MajorDev = MKDEV(visorchipset_major, 0);
2229         rc = visorchipset_file_init(MajorDev, &ControlVm_channel);
2230         if (rc < 0) {
2231                 POSTCODE_LINUX_2(CHIPSET_INIT_FAILURE_PC, DIAG_SEVERITY_ERR);
2232                 goto Away;
2233         }
2234
2235         memset(&g_DiagMsgHdr, 0, sizeof(struct controlvm_message_header));
2236
2237         memset(&g_ChipSetMsgHdr, 0, sizeof(struct controlvm_message_header));
2238
2239         memset(&g_DelDumpMsgHdr, 0, sizeof(struct controlvm_message_header));
2240
2241         Putfile_buffer_list_pool =
2242             kmem_cache_create(Putfile_buffer_list_pool_name,
2243                               sizeof(struct putfile_buffer_entry),
2244                               0, SLAB_HWCACHE_ALIGN, NULL);
2245         if (!Putfile_buffer_list_pool) {
2246                 POSTCODE_LINUX_2(CHIPSET_INIT_FAILURE_PC, DIAG_SEVERITY_ERR);
2247                 rc = -1;
2248                 goto Away;
2249         }
2250         if (!visorchipset_disable_controlvm) {
2251                 /* if booting in a crash kernel */
2252                 if (visorchipset_crash_kernel)
2253                         INIT_DELAYED_WORK(&Periodic_controlvm_work,
2254                                           setup_crash_devices_work_queue);
2255                 else
2256                         INIT_DELAYED_WORK(&Periodic_controlvm_work,
2257                                           controlvm_periodic_work);
2258                 Periodic_controlvm_workqueue =
2259                     create_singlethread_workqueue("visorchipset_controlvm");
2260
2261                 if (Periodic_controlvm_workqueue == NULL) {
2262                         POSTCODE_LINUX_2(CREATE_WORKQUEUE_FAILED_PC,
2263                                          DIAG_SEVERITY_ERR);
2264                         rc = -ENOMEM;
2265                         goto Away;
2266                 }
2267                 Most_recent_message_jiffies = jiffies;
2268                 Poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_FAST;
2269                 rc = queue_delayed_work(Periodic_controlvm_workqueue,
2270                                         &Periodic_controlvm_work, Poll_jiffies);
2271                 if (rc < 0) {
2272                         POSTCODE_LINUX_2(QUEUE_DELAYED_WORK_PC,
2273                                          DIAG_SEVERITY_ERR);
2274                         goto Away;
2275                 }
2276
2277         }
2278
2279         Visorchipset_platform_device.dev.devt = MajorDev;
2280         if (platform_device_register(&Visorchipset_platform_device) < 0) {
2281                 POSTCODE_LINUX_2(DEVICE_REGISTER_FAILURE_PC, DIAG_SEVERITY_ERR);
2282                 rc = -1;
2283                 goto Away;
2284         }
2285         POSTCODE_LINUX_2(CHIPSET_INIT_SUCCESS_PC, POSTCODE_SEVERITY_INFO);
2286         rc = 0;
2287 Away:
2288         if (rc) {
2289                 POSTCODE_LINUX_3(CHIPSET_INIT_FAILURE_PC, rc,
2290                                  POSTCODE_SEVERITY_ERR);
2291         }
2292         return rc;
2293 }
2294
2295 static void
2296 visorchipset_exit(void)
2297 {
2298         POSTCODE_LINUX_2(DRIVER_EXIT_PC, POSTCODE_SEVERITY_INFO);
2299
2300         if (visorchipset_disable_controlvm) {
2301                 ;
2302         } else {
2303                 cancel_delayed_work(&Periodic_controlvm_work);
2304                 flush_workqueue(Periodic_controlvm_workqueue);
2305                 destroy_workqueue(Periodic_controlvm_workqueue);
2306                 Periodic_controlvm_workqueue = NULL;
2307                 destroy_controlvm_payload_info(&ControlVm_payload_info);
2308         }
2309         Test_Vnic_channel = NULL;
2310         if (Putfile_buffer_list_pool) {
2311                 kmem_cache_destroy(Putfile_buffer_list_pool);
2312                 Putfile_buffer_list_pool = NULL;
2313         }
2314
2315         cleanup_controlvm_structures();
2316
2317         memset(&g_DiagMsgHdr, 0, sizeof(struct controlvm_message_header));
2318
2319         memset(&g_ChipSetMsgHdr, 0, sizeof(struct controlvm_message_header));
2320
2321         memset(&g_DelDumpMsgHdr, 0, sizeof(struct controlvm_message_header));
2322
2323         visorchannel_destroy(ControlVm_channel);
2324
2325         visorchipset_file_cleanup();
2326         POSTCODE_LINUX_2(DRIVER_EXIT_PC, POSTCODE_SEVERITY_INFO);
2327 }
2328
2329 module_param_named(testvnic, visorchipset_testvnic, int, S_IRUGO);
2330 MODULE_PARM_DESC(visorchipset_testvnic, "1 to test vnic, using dummy VNIC connected via a loopback to a physical ethernet");
2331 int visorchipset_testvnic = 0;
2332
2333 module_param_named(testvnicclient, visorchipset_testvnicclient, int, S_IRUGO);
2334 MODULE_PARM_DESC(visorchipset_testvnicclient, "1 to test vnic, using real VNIC channel attached to a separate IOVM guest");
2335 int visorchipset_testvnicclient = 0;
2336
2337 module_param_named(testmsg, visorchipset_testmsg, int, S_IRUGO);
2338 MODULE_PARM_DESC(visorchipset_testmsg,
2339                  "1 to manufacture the chipset, bus, and switch messages");
2340 int visorchipset_testmsg = 0;
2341
2342 module_param_named(major, visorchipset_major, int, S_IRUGO);
2343 MODULE_PARM_DESC(visorchipset_major, "major device number to use for the device node");
2344 int visorchipset_major = 0;
2345
2346 module_param_named(serverregwait, visorchipset_serverregwait, int, S_IRUGO);
2347 MODULE_PARM_DESC(visorchipset_serverreqwait,
2348                  "1 to have the module wait for the visor bus to register");
2349 int visorchipset_serverregwait = 0;     /* default is off */
2350 module_param_named(clientregwait, visorchipset_clientregwait, int, S_IRUGO);
2351 MODULE_PARM_DESC(visorchipset_clientregwait, "1 to have the module wait for the visorclientbus to register");
2352 int visorchipset_clientregwait = 1;     /* default is on */
2353 module_param_named(testteardown, visorchipset_testteardown, int, S_IRUGO);
2354 MODULE_PARM_DESC(visorchipset_testteardown,
2355                  "1 to test teardown of the chipset, bus, and switch");
2356 int visorchipset_testteardown = 0;      /* default is off */
2357 module_param_named(disable_controlvm, visorchipset_disable_controlvm, int,
2358                    S_IRUGO);
2359 MODULE_PARM_DESC(visorchipset_disable_controlvm,
2360                  "1 to disable polling of controlVm channel");
2361 int visorchipset_disable_controlvm = 0; /* default is off */
2362 module_param_named(crash_kernel, visorchipset_crash_kernel, int, S_IRUGO);
2363 MODULE_PARM_DESC(visorchipset_crash_kernel,
2364                  "1 means we are running in crash kernel");
2365 int visorchipset_crash_kernel = 0; /* default is running in non-crash kernel */
2366 module_param_named(holdchipsetready, visorchipset_holdchipsetready,
2367                    int, S_IRUGO);
2368 MODULE_PARM_DESC(visorchipset_holdchipsetready,
2369                  "1 to hold response to CHIPSET_READY");
2370 int visorchipset_holdchipsetready = 0; /* default is to send CHIPSET_READY
2371                                       * response immediately */
2372 module_init(visorchipset_init);
2373 module_exit(visorchipset_exit);
2374
2375 MODULE_AUTHOR("Unisys");
2376 MODULE_LICENSE("GPL");
2377 MODULE_DESCRIPTION("Supervisor chipset driver for service partition: ver "
2378                    VERSION);
2379 MODULE_VERSION(VERSION);