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