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   1 /*
   2   * mf.c
   3   * Copyright (C) 2001 Troy D. Armstrong  IBM Corporation
   4   * Copyright (C) 2004-2005 Stephen Rothwell  IBM Corporation
   5   *
   6   * This modules exists as an interface between a Linux secondary partition
   7   * running on an iSeries and the primary partition's Virtual Service
   8   * Processor (VSP) object.  The VSP has final authority over powering on/off
   9   * all partitions in the iSeries.  It also provides miscellaneous low-level
  10   * machine facility type operations.
  11   *
  12   *
  13   * This program is free software; you can redistribute it and/or modify
  14   * it under the terms of the GNU General Public License as published by
  15   * the Free Software Foundation; either version 2 of the License, or
  16   * (at your option) any later version.
  17   *
  18   * This program is distributed in the hope that it will be useful,
  19   * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21   * GNU General Public License for more details.
  22   *
  23   * You should have received a copy of the GNU General Public License
  24   * along with this program; if not, write to the Free Software
  25   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  26   */
  27
  28 #include <linux/types.h>
  29 #include <linux/errno.h>
  30 #include <linux/kernel.h>
  31 #include <linux/init.h>
  32 #include <linux/completion.h>
  33 #include <linux/delay.h>
  34 #include <linux/dma-mapping.h>
  35 #include <linux/bcd.h>
  36
  37 #include <asm/time.h>
  38 #include <asm/uaccess.h>
  39 #include <asm/paca.h>
  40 #include <asm/iSeries/vio.h>
  41 #include <asm/iSeries/mf.h>
  42 #include <asm/iSeries/HvLpConfig.h>
  43 #include <asm/iSeries/ItLpQueue.h>
  44
  45 /*
  46  * This is the structure layout for the Machine Facilites LPAR event
  47  * flows.
  48  */
  49 struct vsp_cmd_data {
  50         u64 token;
  51         u16 cmd;
  52         HvLpIndex lp_index;
  53         u8 result_code;
  54         u32 reserved;
  55         union {
  56                 u64 state;      /* GetStateOut */
  57                 u64 ipl_type;   /* GetIplTypeOut, Function02SelectIplTypeIn */
  58                 u64 ipl_mode;   /* GetIplModeOut, Function02SelectIplModeIn */
  59                 u64 page[4];    /* GetSrcHistoryIn */
  60                 u64 flag;       /* GetAutoIplWhenPrimaryIplsOut,
  61                                    SetAutoIplWhenPrimaryIplsIn,
  62                                    WhiteButtonPowerOffIn,
  63                                    Function08FastPowerOffIn,
  64                                    IsSpcnRackPowerIncompleteOut */
  65                 struct {
  66                         u64 token;
  67                         u64 address_type;
  68                         u64 side;
  69                         u32 length;
  70                         u32 offset;
  71                 } kern;         /* SetKernelImageIn, GetKernelImageIn,
  72                                    SetKernelCmdLineIn, GetKernelCmdLineIn */
  73                 u32 length_out; /* GetKernelImageOut, GetKernelCmdLineOut */
  74                 u8 reserved[80];
  75         } sub_data;
  76 };
  77
  78 struct vsp_rsp_data {
  79         struct completion com;
  80         struct vsp_cmd_data *response;
  81 };
  82
  83 struct alloc_data {
  84         u16 size;
  85         u16 type;
  86         u32 count;
  87         u16 reserved1;
  88         u8 reserved2;
  89         HvLpIndex target_lp;
  90 };
  91
  92 struct ce_msg_data;
  93
  94 typedef void (*ce_msg_comp_hdlr)(void *token, struct ce_msg_data *vsp_cmd_rsp);
  95
  96 struct ce_msg_comp_data {
  97         ce_msg_comp_hdlr handler;
  98         void *token;
  99 };
 100
 101 struct ce_msg_data {
 102         u8 ce_msg[12];
 103         char reserved[4];
 104         struct ce_msg_comp_data *completion;
 105 };
 106
 107 struct io_mf_lp_event {
 108         struct HvLpEvent hp_lp_event;
 109         u16 subtype_result_code;
 110         u16 reserved1;
 111         u32 reserved2;
 112         union {
 113                 struct alloc_data alloc;
 114                 struct ce_msg_data ce_msg;
 115                 struct vsp_cmd_data vsp_cmd;
 116         } data;
 117 };
 118
 119 #define subtype_data(a, b, c, d)        \
 120                 (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
 121
 122 /*
 123  * All outgoing event traffic is kept on a FIFO queue.  The first
 124  * pointer points to the one that is outstanding, and all new
 125  * requests get stuck on the end.  Also, we keep a certain number of
 126  * preallocated pending events so that we can operate very early in
 127  * the boot up sequence (before kmalloc is ready).
 128  */
 129 struct pending_event {
 130         struct pending_event *next;
 131         struct io_mf_lp_event event;
 132         MFCompleteHandler hdlr;
 133         char dma_data[72];
 134         unsigned dma_data_length;
 135         unsigned remote_address;
 136 };
 137 static spinlock_t pending_event_spinlock;
 138 static struct pending_event *pending_event_head;
 139 static struct pending_event *pending_event_tail;
 140 static struct pending_event *pending_event_avail;
 141 static struct pending_event pending_event_prealloc[16];
 142
 143 /*
 144  * Put a pending event onto the available queue, so it can get reused.
 145  * Attention! You must have the pending_event_spinlock before calling!
 146  */
 147 static void free_pending_event(struct pending_event *ev)
 148 {
 149         if (ev != NULL) {
 150                 ev->next = pending_event_avail;
 151                 pending_event_avail = ev;
 152         }
 153 }
 154
 155 /*
 156  * Enqueue the outbound event onto the stack.  If the queue was
 157  * empty to begin with, we must also issue it via the Hypervisor
 158  * interface.  There is a section of code below that will touch
 159  * the first stack pointer without the protection of the pending_event_spinlock.
 160  * This is OK, because we know that nobody else will be modifying
 161  * the first pointer when we do this.
 162  */
 163 static int signal_event(struct pending_event *ev)
 164 {
 165         int rc = 0;
 166         unsigned long flags;
 167         int go = 1;
 168         struct pending_event *ev1;
 169         HvLpEvent_Rc hv_rc;
 170
 171         /* enqueue the event */
 172         if (ev != NULL) {
 173                 ev->next = NULL;
 174                 spin_lock_irqsave(&pending_event_spinlock, flags);
 175                 if (pending_event_head == NULL)
 176                         pending_event_head = ev;
 177                 else {
 178                         go = 0;
 179                         pending_event_tail->next = ev;
 180                 }
 181                 pending_event_tail = ev;
 182                 spin_unlock_irqrestore(&pending_event_spinlock, flags);
 183         }
 184
 185         /* send the event */
 186         while (go) {
 187                 go = 0;
 188
 189                 /* any DMA data to send beforehand? */
 190                 if (pending_event_head->dma_data_length > 0)
 191                         HvCallEvent_dmaToSp(pending_event_head->dma_data,
 192                                         pending_event_head->remote_address,
 193                                         pending_event_head->dma_data_length,
 194                                         HvLpDma_Direction_LocalToRemote);
 195
 196                 hv_rc = HvCallEvent_signalLpEvent(
 197                                 &pending_event_head->event.hp_lp_event);
 198                 if (hv_rc != HvLpEvent_Rc_Good) {
 199                         printk(KERN_ERR "mf.c: HvCallEvent_signalLpEvent() "
 200                                         "failed with %d\n", (int)hv_rc);
 201
 202                         spin_lock_irqsave(&pending_event_spinlock, flags);
 203                         ev1 = pending_event_head;
 204                         pending_event_head = pending_event_head->next;
 205                         if (pending_event_head != NULL)
 206                                 go = 1;
 207                         spin_unlock_irqrestore(&pending_event_spinlock, flags);
 208
 209                         if (ev1 == ev)
 210                                 rc = -EIO;
 211                         else if (ev1->hdlr != NULL)
 212                                 (*ev1->hdlr)((void *)ev1->event.hp_lp_event.xCorrelationToken, -EIO);
 213
 214                         spin_lock_irqsave(&pending_event_spinlock, flags);
 215                         free_pending_event(ev1);
 216                         spin_unlock_irqrestore(&pending_event_spinlock, flags);
 217                 }
 218         }
 219
 220         return rc;
 221 }
 222
 223 /*
 224  * Allocate a new pending_event structure, and initialize it.
 225  */
 226 static struct pending_event *new_pending_event(void)
 227 {
 228         struct pending_event *ev = NULL;
 229         HvLpIndex primary_lp = HvLpConfig_getPrimaryLpIndex();
 230         unsigned long flags;
 231         struct HvLpEvent *hev;
 232
 233         spin_lock_irqsave(&pending_event_spinlock, flags);
 234         if (pending_event_avail != NULL) {
 235                 ev = pending_event_avail;
 236                 pending_event_avail = pending_event_avail->next;
 237         }
 238         spin_unlock_irqrestore(&pending_event_spinlock, flags);
 239         if (ev == NULL) {
 240                 ev = kmalloc(sizeof(struct pending_event), GFP_ATOMIC);
 241                 if (ev == NULL) {
 242                         printk(KERN_ERR "mf.c: unable to kmalloc %ld bytes\n",
 243                                         sizeof(struct pending_event));
 244                         return NULL;
 245                 }
 246         }
 247         memset(ev, 0, sizeof(struct pending_event));
 248         hev = &ev->event.hp_lp_event;
 249         hev->xFlags.xValid = 1;
 250         hev->xFlags.xAckType = HvLpEvent_AckType_ImmediateAck;
 251         hev->xFlags.xAckInd = HvLpEvent_AckInd_DoAck;
 252         hev->xFlags.xFunction = HvLpEvent_Function_Int;
 253         hev->xType = HvLpEvent_Type_MachineFac;
 254         hev->xSourceLp = HvLpConfig_getLpIndex();
 255         hev->xTargetLp = primary_lp;
 256         hev->xSizeMinus1 = sizeof(ev->event) - 1;
 257         hev->xRc = HvLpEvent_Rc_Good;
 258         hev->xSourceInstanceId = HvCallEvent_getSourceLpInstanceId(primary_lp,
 259                         HvLpEvent_Type_MachineFac);
 260         hev->xTargetInstanceId = HvCallEvent_getTargetLpInstanceId(primary_lp,
 261                         HvLpEvent_Type_MachineFac);
 262
 263         return ev;
 264 }
 265
 266 static int signal_vsp_instruction(struct vsp_cmd_data *vsp_cmd)
 267 {
 268         struct pending_event *ev = new_pending_event();
 269         int rc;
 270         struct vsp_rsp_data response;
 271
 272         if (ev == NULL)
 273                 return -ENOMEM;
 274
 275         init_completion(&response.com);
 276         response.response = vsp_cmd;
 277         ev->event.hp_lp_event.xSubtype = 6;
 278         ev->event.hp_lp_event.x.xSubtypeData =
 279                 subtype_data('M', 'F',  'V',  'I');
 280         ev->event.data.vsp_cmd.token = (u64)&response;
 281         ev->event.data.vsp_cmd.cmd = vsp_cmd->cmd;
 282         ev->event.data.vsp_cmd.lp_index = HvLpConfig_getLpIndex();
 283         ev->event.data.vsp_cmd.result_code = 0xFF;
 284         ev->event.data.vsp_cmd.reserved = 0;
 285         memcpy(&(ev->event.data.vsp_cmd.sub_data),
 286                         &(vsp_cmd->sub_data), sizeof(vsp_cmd->sub_data));
 287         mb();
 288
 289         rc = signal_event(ev);
 290         if (rc == 0)
 291                 wait_for_completion(&response.com);
 292         return rc;
 293 }
 294
 295
 296 /*
 297  * Send a 12-byte CE message to the primary partition VSP object
 298  */
 299 static int signal_ce_msg(char *ce_msg, struct ce_msg_comp_data *completion)
 300 {
 301         struct pending_event *ev = new_pending_event();
 302
 303         if (ev == NULL)
 304                 return -ENOMEM;
 305
 306         ev->event.hp_lp_event.xSubtype = 0;
 307         ev->event.hp_lp_event.x.xSubtypeData =
 308                 subtype_data('M',  'F',  'C',  'E');
 309         memcpy(ev->event.data.ce_msg.ce_msg, ce_msg, 12);
 310         ev->event.data.ce_msg.completion = completion;
 311         return signal_event(ev);
 312 }
 313
 314 /*
 315  * Send a 12-byte CE message (with no data) to the primary partition VSP object
 316  */
 317 static int signal_ce_msg_simple(u8 ce_op, struct ce_msg_comp_data *completion)
 318 {
 319         u8 ce_msg[12];
 320
 321         memset(ce_msg, 0, sizeof(ce_msg));
 322         ce_msg[3] = ce_op;
 323         return signal_ce_msg(ce_msg, completion);
 324 }
 325
 326 /*
 327  * Send a 12-byte CE message and DMA data to the primary partition VSP object
 328  */
 329 static int dma_and_signal_ce_msg(char *ce_msg,
 330                 struct ce_msg_comp_data *completion, void *dma_data,
 331                 unsigned dma_data_length, unsigned remote_address)
 332 {
 333         struct pending_event *ev = new_pending_event();
 334
 335         if (ev == NULL)
 336                 return -ENOMEM;
 337
 338         ev->event.hp_lp_event.xSubtype = 0;
 339         ev->event.hp_lp_event.x.xSubtypeData =
 340                 subtype_data('M', 'F', 'C', 'E');
 341         memcpy(ev->event.data.ce_msg.ce_msg, ce_msg, 12);
 342         ev->event.data.ce_msg.completion = completion;
 343         memcpy(ev->dma_data, dma_data, dma_data_length);
 344         ev->dma_data_length = dma_data_length;
 345         ev->remote_address = remote_address;
 346         return signal_event(ev);
 347 }
 348
 349 /*
 350  * Initiate a nice (hopefully) shutdown of Linux.  We simply are
 351  * going to try and send the init process a SIGINT signal.  If
 352  * this fails (why?), we'll simply force it off in a not-so-nice
 353  * manner.
 354  */
 355 static int shutdown(void)
 356 {
 357         int rc = kill_proc(1, SIGINT, 1);
 358
 359         if (rc) {
 360                 printk(KERN_ALERT "mf.c: SIGINT to init failed (%d), "
 361                                 "hard shutdown commencing\n", rc);
 362                 mf_power_off();
 363         } else
 364                 printk(KERN_INFO "mf.c: init has been successfully notified "
 365                                 "to proceed with shutdown\n");
 366         return rc;
 367 }
 368
 369 /*
 370  * The primary partition VSP object is sending us a new
 371  * event flow.  Handle it...
 372  */
 373 static void handle_int(struct io_mf_lp_event *event)
 374 {
 375         struct ce_msg_data *ce_msg_data;
 376         struct ce_msg_data *pce_msg_data;
 377         unsigned long flags;
 378         struct pending_event *pev;
 379
 380         /* ack the interrupt */
 381         event->hp_lp_event.xRc = HvLpEvent_Rc_Good;
 382         HvCallEvent_ackLpEvent(&event->hp_lp_event);
 383
 384         /* process interrupt */
 385         switch (event->hp_lp_event.xSubtype) {
 386         case 0: /* CE message */
 387                 ce_msg_data = &event->data.ce_msg;
 388                 switch (ce_msg_data->ce_msg[3]) {
 389                 case 0x5B:      /* power control notification */
 390                         if ((ce_msg_data->ce_msg[5] & 0x20) != 0) {
 391                                 printk(KERN_INFO "mf.c: Commencing partition shutdown\n");
 392                                 if (shutdown() == 0)
 393                                         signal_ce_msg_simple(0xDB, NULL);
 394                         }
 395                         break;
 396                 case 0xC0:      /* get time */
 397                         spin_lock_irqsave(&pending_event_spinlock, flags);
 398                         pev = pending_event_head;
 399                         if (pev != NULL)
 400                                 pending_event_head = pending_event_head->next;
 401                         spin_unlock_irqrestore(&pending_event_spinlock, flags);
 402                         if (pev == NULL)
 403                                 break;
 404                         pce_msg_data = &pev->event.data.ce_msg;
 405                         if (pce_msg_data->ce_msg[3] != 0x40)
 406                                 break;
 407                         if (pce_msg_data->completion != NULL) {
 408                                 ce_msg_comp_hdlr handler =
 409                                         pce_msg_data->completion->handler;
 410                                 void *token = pce_msg_data->completion->token;
 411
 412                                 if (handler != NULL)
 413                                         (*handler)(token, ce_msg_data);
 414                         }
 415                         spin_lock_irqsave(&pending_event_spinlock, flags);
 416                         free_pending_event(pev);
 417                         spin_unlock_irqrestore(&pending_event_spinlock, flags);
 418                         /* send next waiting event */
 419                         if (pending_event_head != NULL)
 420                                 signal_event(NULL);
 421                         break;
 422                 }
 423                 break;
 424         case 1: /* IT sys shutdown */
 425                 printk(KERN_INFO "mf.c: Commencing system shutdown\n");
 426                 shutdown();
 427                 break;
 428         }
 429 }
 430
 431 /*
 432  * The primary partition VSP object is acknowledging the receipt
 433  * of a flow we sent to them.  If there are other flows queued
 434  * up, we must send another one now...
 435  */
 436 static void handle_ack(struct io_mf_lp_event *event)
 437 {
 438         unsigned long flags;
 439         struct pending_event *two = NULL;
 440         unsigned long free_it = 0;
 441         struct ce_msg_data *ce_msg_data;
 442         struct ce_msg_data *pce_msg_data;
 443         struct vsp_rsp_data *rsp;
 444
 445         /* handle current event */
 446         if (pending_event_head == NULL) {
 447                 printk(KERN_ERR "mf.c: stack empty for receiving ack\n");
 448                 return;
 449         }
 450
 451         switch (event->hp_lp_event.xSubtype) {
 452         case 0:     /* CE msg */
 453                 ce_msg_data = &event->data.ce_msg;
 454                 if (ce_msg_data->ce_msg[3] != 0x40) {
 455                         free_it = 1;
 456                         break;
 457                 }
 458                 if (ce_msg_data->ce_msg[2] == 0)
 459                         break;
 460                 free_it = 1;
 461                 pce_msg_data = &pending_event_head->event.data.ce_msg;
 462                 if (pce_msg_data->completion != NULL) {
 463                         ce_msg_comp_hdlr handler =
 464                                 pce_msg_data->completion->handler;
 465                         void *token = pce_msg_data->completion->token;
 466
 467                         if (handler != NULL)
 468                                 (*handler)(token, ce_msg_data);
 469                 }
 470                 break;
 471         case 4: /* allocate */
 472         case 5: /* deallocate */
 473                 if (pending_event_head->hdlr != NULL)
 474                         (*pending_event_head->hdlr)((void *)event->hp_lp_event.xCorrelationToken, event->data.alloc.count);
 475                 free_it = 1;
 476                 break;
 477         case 6:
 478                 free_it = 1;
 479                 rsp = (struct vsp_rsp_data *)event->data.vsp_cmd.token;
 480                 if (rsp == NULL) {
 481                         printk(KERN_ERR "mf.c: no rsp\n");
 482                         break;
 483                 }
 484                 if (rsp->response != NULL)
 485                         memcpy(rsp->response, &event->data.vsp_cmd,
 486                                         sizeof(event->data.vsp_cmd));
 487                 complete(&rsp->com);
 488                 break;
 489         }
 490
 491         /* remove from queue */
 492         spin_lock_irqsave(&pending_event_spinlock, flags);
 493         if ((pending_event_head != NULL) && (free_it == 1)) {
 494                 struct pending_event *oldHead = pending_event_head;
 495
 496                 pending_event_head = pending_event_head->next;
 497                 two = pending_event_head;
 498                 free_pending_event(oldHead);
 499         }
 500         spin_unlock_irqrestore(&pending_event_spinlock, flags);
 501
 502         /* send next waiting event */
 503         if (two != NULL)
 504                 signal_event(NULL);
 505 }
 506
 507 /*
 508  * This is the generic event handler we are registering with
 509  * the Hypervisor.  Ensure the flows are for us, and then
 510  * parse it enough to know if it is an interrupt or an
 511  * acknowledge.
 512  */
 513 static void hv_handler(struct HvLpEvent *event, struct pt_regs *regs)
 514 {
 515         if ((event != NULL) && (event->xType == HvLpEvent_Type_MachineFac)) {
 516                 switch(event->xFlags.xFunction) {
 517                 case HvLpEvent_Function_Ack:
 518                         handle_ack((struct io_mf_lp_event *)event);
 519                         break;
 520                 case HvLpEvent_Function_Int:
 521                         handle_int((struct io_mf_lp_event *)event);
 522                         break;
 523                 default:
 524                         printk(KERN_ERR "mf.c: non ack/int event received\n");
 525                         break;
 526                 }
 527         } else
 528                 printk(KERN_ERR "mf.c: alien event received\n");
 529 }
 530
 531 /*
 532  * Global kernel interface to allocate and seed events into the
 533  * Hypervisor.
 534  */
 535 void mf_allocate_lp_events(HvLpIndex target_lp, HvLpEvent_Type type,
 536                 unsigned size, unsigned count, MFCompleteHandler hdlr,
 537                 void *user_token)
 538 {
 539         struct pending_event *ev = new_pending_event();
 540         int rc;
 541
 542         if (ev == NULL) {
 543                 rc = -ENOMEM;
 544         } else {
 545                 ev->event.hp_lp_event.xSubtype = 4;
 546                 ev->event.hp_lp_event.xCorrelationToken = (u64)user_token;
 547                 ev->event.hp_lp_event.x.xSubtypeData =
 548                         subtype_data('M', 'F', 'M', 'A');
 549                 ev->event.data.alloc.target_lp = target_lp;
 550                 ev->event.data.alloc.type = type;
 551                 ev->event.data.alloc.size = size;
 552                 ev->event.data.alloc.count = count;
 553                 ev->hdlr = hdlr;
 554                 rc = signal_event(ev);
 555         }
 556         if ((rc != 0) && (hdlr != NULL))
 557                 (*hdlr)(user_token, rc);
 558 }
 559 EXPORT_SYMBOL(mf_allocate_lp_events);
 560
 561 /*
 562  * Global kernel interface to unseed and deallocate events already in
 563  * Hypervisor.
 564  */
 565 void mf_deallocate_lp_events(HvLpIndex target_lp, HvLpEvent_Type type,
 566                 unsigned count, MFCompleteHandler hdlr, void *user_token)
 567 {
 568         struct pending_event *ev = new_pending_event();
 569         int rc;
 570
 571         if (ev == NULL)
 572                 rc = -ENOMEM;
 573         else {
 574                 ev->event.hp_lp_event.xSubtype = 5;
 575                 ev->event.hp_lp_event.xCorrelationToken = (u64)user_token;
 576                 ev->event.hp_lp_event.x.xSubtypeData =
 577                         subtype_data('M', 'F', 'M', 'D');
 578                 ev->event.data.alloc.target_lp = target_lp;
 579                 ev->event.data.alloc.type = type;
 580                 ev->event.data.alloc.count = count;
 581                 ev->hdlr = hdlr;
 582                 rc = signal_event(ev);
 583         }
 584         if ((rc != 0) && (hdlr != NULL))
 585                 (*hdlr)(user_token, rc);
 586 }
 587 EXPORT_SYMBOL(mf_deallocate_lp_events);
 588
 589 /*
 590  * Global kernel interface to tell the VSP object in the primary
 591  * partition to power this partition off.
 592  */
 593 void mf_power_off(void)
 594 {
 595         printk(KERN_INFO "mf.c: Down it goes...\n");
 596         signal_ce_msg_simple(0x4d, NULL);
 597         for (;;)
 598                 ;
 599 }
 600
 601 /*
 602  * Global kernel interface to tell the VSP object in the primary
 603  * partition to reboot this partition.
 604  */
 605 void mf_reboot(void)
 606 {
 607         printk(KERN_INFO "mf.c: Preparing to bounce...\n");
 608         signal_ce_msg_simple(0x4e, NULL);
 609         for (;;)
 610                 ;
 611 }
 612
 613 /*
 614  * Display a single word SRC onto the VSP control panel.
 615  */
 616 void mf_display_src(u32 word)
 617 {
 618         u8 ce[12];
 619
 620         memset(ce, 0, sizeof(ce));
 621         ce[3] = 0x4a;
 622         ce[7] = 0x01;
 623         ce[8] = word >> 24;
 624         ce[9] = word >> 16;
 625         ce[10] = word >> 8;
 626         ce[11] = word;
 627         signal_ce_msg(ce, NULL);
 628 }
 629
 630 /*
 631  * Display a single word SRC of the form "PROGXXXX" on the VSP control panel.
 632  */
 633 void mf_display_progress(u16 value)
 634 {
 635         u8 ce[12];
 636         u8 src[72];
 637
 638         memcpy(ce, "\x00\x00\x04\x4A\x00\x00\x00\x48\x00\x00\x00\x00", 12);
 639         memcpy(src, "\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00"
 640                 "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
 641                 "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
 642                 "\x00\x00\x00\x00PROGxxxx                        ",
 643                 72);
 644         src[6] = value >> 8;
 645         src[7] = value & 255;
 646         src[44] = "0123456789ABCDEF"[(value >> 12) & 15];
 647         src[45] = "0123456789ABCDEF"[(value >> 8) & 15];
 648         src[46] = "0123456789ABCDEF"[(value >> 4) & 15];
 649         src[47] = "0123456789ABCDEF"[value & 15];
 650         dma_and_signal_ce_msg(ce, NULL, src, sizeof(src), 9 * 64 * 1024);
 651 }
 652
 653 /*
 654  * Clear the VSP control panel.  Used to "erase" an SRC that was
 655  * previously displayed.
 656  */
 657 void mf_clear_src(void)
 658 {
 659         signal_ce_msg_simple(0x4b, NULL);
 660 }
 661
 662 /*
 663  * Initialization code here.
 664  */
 665 void mf_init(void)
 666 {
 667         int i;
 668
 669         /* initialize */
 670         spin_lock_init(&pending_event_spinlock);
 671         for (i = 0;
 672              i < sizeof(pending_event_prealloc) / sizeof(*pending_event_prealloc);
 673              ++i)
 674                 free_pending_event(&pending_event_prealloc[i]);
 675         HvLpEvent_registerHandler(HvLpEvent_Type_MachineFac, &hv_handler);
 676
 677         /* virtual continue ack */
 678         signal_ce_msg_simple(0x57, NULL);
 679
 680         /* initialization complete */
 681         printk(KERN_NOTICE "mf.c: iSeries Linux LPAR Machine Facilities "
 682                         "initialized\n");
 683 }
 684
 685 struct rtc_time_data {
 686         struct completion com;
 687         struct ce_msg_data ce_msg;
 688         int rc;
 689 };
 690
 691 static void get_rtc_time_complete(void *token, struct ce_msg_data *ce_msg)
 692 {
 693         struct rtc_time_data *rtc = token;
 694
 695         memcpy(&rtc->ce_msg, ce_msg, sizeof(rtc->ce_msg));
 696         rtc->rc = 0;
 697         complete(&rtc->com);
 698 }
 699
 700 static int rtc_set_tm(int rc, u8 *ce_msg, struct rtc_time *tm)
 701 {
 702         tm->tm_wday = 0;
 703         tm->tm_yday = 0;
 704         tm->tm_isdst = 0;
 705         if (rc) {
 706                 tm->tm_sec = 0;
 707                 tm->tm_min = 0;
 708                 tm->tm_hour = 0;
 709                 tm->tm_mday = 15;
 710                 tm->tm_mon = 5;
 711                 tm->tm_year = 52;
 712                 return rc;
 713         }
 714
 715         if ((ce_msg[2] == 0xa9) ||
 716             (ce_msg[2] == 0xaf)) {
 717                 /* TOD clock is not set */
 718                 tm->tm_sec = 1;
 719                 tm->tm_min = 1;
 720                 tm->tm_hour = 1;
 721                 tm->tm_mday = 10;
 722                 tm->tm_mon = 8;
 723                 tm->tm_year = 71;
 724                 mf_set_rtc(tm);
 725         }
 726         {
 727                 u8 year = ce_msg[5];
 728                 u8 sec = ce_msg[6];
 729                 u8 min = ce_msg[7];
 730                 u8 hour = ce_msg[8];
 731                 u8 day = ce_msg[10];
 732                 u8 mon = ce_msg[11];
 733
 734                 BCD_TO_BIN(sec);
 735                 BCD_TO_BIN(min);
 736                 BCD_TO_BIN(hour);
 737                 BCD_TO_BIN(day);
 738                 BCD_TO_BIN(mon);
 739                 BCD_TO_BIN(year);
 740
 741                 if (year <= 69)
 742                         year += 100;
 743
 744                 tm->tm_sec = sec;
 745                 tm->tm_min = min;
 746                 tm->tm_hour = hour;
 747                 tm->tm_mday = day;
 748                 tm->tm_mon = mon;
 749                 tm->tm_year = year;
 750         }
 751
 752         return 0;
 753 }
 754
 755 int mf_get_rtc(struct rtc_time *tm)
 756 {
 757         struct ce_msg_comp_data ce_complete;
 758         struct rtc_time_data rtc_data;
 759         int rc;
 760
 761         memset(&ce_complete, 0, sizeof(ce_complete));
 762         memset(&rtc_data, 0, sizeof(rtc_data));
 763         init_completion(&rtc_data.com);
 764         ce_complete.handler = &get_rtc_time_complete;
 765         ce_complete.token = &rtc_data;
 766         rc = signal_ce_msg_simple(0x40, &ce_complete);
 767         if (rc)
 768                 return rc;
 769         wait_for_completion(&rtc_data.com);
 770         return rtc_set_tm(rtc_data.rc, rtc_data.ce_msg.ce_msg, tm);
 771 }
 772
 773 struct boot_rtc_time_data {
 774         int busy;
 775         struct ce_msg_data ce_msg;
 776         int rc;
 777 };
 778
 779 static void get_boot_rtc_time_complete(void *token, struct ce_msg_data *ce_msg)
 780 {
 781         struct boot_rtc_time_data *rtc = token;
 782
 783         memcpy(&rtc->ce_msg, ce_msg, sizeof(rtc->ce_msg));
 784         rtc->rc = 0;
 785         rtc->busy = 0;
 786 }
 787
 788 int mf_get_boot_rtc(struct rtc_time *tm)
 789 {
 790         struct ce_msg_comp_data ce_complete;
 791         struct boot_rtc_time_data rtc_data;
 792         int rc;
 793
 794         memset(&ce_complete, 0, sizeof(ce_complete));
 795         memset(&rtc_data, 0, sizeof(rtc_data));
 796         rtc_data.busy = 1;
 797         ce_complete.handler = &get_boot_rtc_time_complete;
 798         ce_complete.token = &rtc_data;
 799         rc = signal_ce_msg_simple(0x40, &ce_complete);
 800         if (rc)
 801                 return rc;
 802         /* We need to poll here as we are not yet taking interrupts */
 803         while (rtc_data.busy) {
 804                 if (hvlpevent_is_pending())
 805                         process_hvlpevents(NULL);
 806         }
 807         return rtc_set_tm(rtc_data.rc, rtc_data.ce_msg.ce_msg, tm);
 808 }
 809
 810 int mf_set_rtc(struct rtc_time *tm)
 811 {
 812         char ce_time[12];
 813         u8 day, mon, hour, min, sec, y1, y2;
 814         unsigned year;
 815
 816         year = 1900 + tm->tm_year;
 817         y1 = year / 100;
 818         y2 = year % 100;
 819
 820         sec = tm->tm_sec;
 821         min = tm->tm_min;
 822         hour = tm->tm_hour;
 823         day = tm->tm_mday;
 824         mon = tm->tm_mon + 1;
 825
 826         BIN_TO_BCD(sec);
 827         BIN_TO_BCD(min);
 828         BIN_TO_BCD(hour);
 829         BIN_TO_BCD(mon);
 830         BIN_TO_BCD(day);
 831         BIN_TO_BCD(y1);
 832         BIN_TO_BCD(y2);
 833
 834         memset(ce_time, 0, sizeof(ce_time));
 835         ce_time[3] = 0x41;
 836         ce_time[4] = y1;
 837         ce_time[5] = y2;
 838         ce_time[6] = sec;
 839         ce_time[7] = min;
 840         ce_time[8] = hour;
 841         ce_time[10] = day;
 842         ce_time[11] = mon;
 843
 844         return signal_ce_msg(ce_time, NULL);
 845 }
 846
 847 #ifdef CONFIG_PROC_FS
 848
 849 static int proc_mf_dump_cmdline(char *page, char **start, off_t off,
 850                 int count, int *eof, void *data)
 851 {
 852         int len;
 853         char *p;
 854         struct vsp_cmd_data vsp_cmd;
 855         int rc;
 856         dma_addr_t dma_addr;
 857
 858         /* The HV appears to return no more than 256 bytes of command line */
 859         if (off >= 256)
 860                 return 0;
 861         if ((off + count) > 256)
 862                 count = 256 - off;
 863
 864         dma_addr = dma_map_single(iSeries_vio_dev, page, off + count,
 865                         DMA_FROM_DEVICE);
 866         if (dma_mapping_error(dma_addr))
 867                 return -ENOMEM;
 868         memset(page, 0, off + count);
 869         memset(&vsp_cmd, 0, sizeof(vsp_cmd));
 870         vsp_cmd.cmd = 33;
 871         vsp_cmd.sub_data.kern.token = dma_addr;
 872         vsp_cmd.sub_data.kern.address_type = HvLpDma_AddressType_TceIndex;
 873         vsp_cmd.sub_data.kern.side = (u64)data;
 874         vsp_cmd.sub_data.kern.length = off + count;
 875         mb();
 876         rc = signal_vsp_instruction(&vsp_cmd);
 877         dma_unmap_single(iSeries_vio_dev, dma_addr, off + count,
 878                         DMA_FROM_DEVICE);
 879         if (rc)
 880                 return rc;
 881         if (vsp_cmd.result_code != 0)
 882                 return -ENOMEM;
 883         p = page;
 884         len = 0;
 885         while (len < (off + count)) {
 886                 if ((*p == '\0') || (*p == '\n')) {
 887                         if (*p == '\0')
 888                                 *p = '\n';
 889                         p++;
 890                         len++;
 891                         *eof = 1;
 892                         break;
 893                 }
 894                 p++;
 895                 len++;
 896         }
 897
 898         if (len < off) {
 899                 *eof = 1;
 900                 len = 0;
 901         }
 902         return len;
 903 }
 904
 905 #if 0
 906 static int mf_getVmlinuxChunk(char *buffer, int *size, int offset, u64 side)
 907 {
 908         struct vsp_cmd_data vsp_cmd;
 909         int rc;
 910         int len = *size;
 911         dma_addr_t dma_addr;
 912
 913         dma_addr = dma_map_single(iSeries_vio_dev, buffer, len,
 914                         DMA_FROM_DEVICE);
 915         memset(buffer, 0, len);
 916         memset(&vsp_cmd, 0, sizeof(vsp_cmd));
 917         vsp_cmd.cmd = 32;
 918         vsp_cmd.sub_data.kern.token = dma_addr;
 919         vsp_cmd.sub_data.kern.address_type = HvLpDma_AddressType_TceIndex;
 920         vsp_cmd.sub_data.kern.side = side;
 921         vsp_cmd.sub_data.kern.offset = offset;
 922         vsp_cmd.sub_data.kern.length = len;
 923         mb();
 924         rc = signal_vsp_instruction(&vsp_cmd);
 925         if (rc == 0) {
 926                 if (vsp_cmd.result_code == 0)
 927                         *size = vsp_cmd.sub_data.length_out;
 928                 else
 929                         rc = -ENOMEM;
 930         }
 931
 932         dma_unmap_single(iSeries_vio_dev, dma_addr, len, DMA_FROM_DEVICE);
 933
 934         return rc;
 935 }
 936
 937 static int proc_mf_dump_vmlinux(char *page, char **start, off_t off,
 938                 int count, int *eof, void *data)
 939 {
 940         int sizeToGet = count;
 941
 942         if (!capable(CAP_SYS_ADMIN))
 943                 return -EACCES;
 944
 945         if (mf_getVmlinuxChunk(page, &sizeToGet, off, (u64)data) == 0) {
 946                 if (sizeToGet != 0) {
 947                         *start = page + off;
 948                         return sizeToGet;
 949                 }
 950                 *eof = 1;
 951                 return 0;
 952         }
 953         *eof = 1;
 954         return 0;
 955 }
 956 #endif
 957
 958 static int proc_mf_dump_side(char *page, char **start, off_t off,
 959                 int count, int *eof, void *data)
 960 {
 961         int len;
 962         char mf_current_side = ' ';
 963         struct vsp_cmd_data vsp_cmd;
 964
 965         memset(&vsp_cmd, 0, sizeof(vsp_cmd));
 966         vsp_cmd.cmd = 2;
 967         vsp_cmd.sub_data.ipl_type = 0;
 968         mb();
 969
 970         if (signal_vsp_instruction(&vsp_cmd) == 0) {
 971                 if (vsp_cmd.result_code == 0) {
 972                         switch (vsp_cmd.sub_data.ipl_type) {
 973                         case 0: mf_current_side = 'A';
 974                                 break;
 975                         case 1: mf_current_side = 'B';
 976                                 break;
 977                         case 2: mf_current_side = 'C';
 978                                 break;
 979                         default:        mf_current_side = 'D';
 980                                 break;
 981                         }
 982                 }
 983         }
 984
 985         len = sprintf(page, "%c\n", mf_current_side);
 986
 987         if (len <= (off + count))
 988                 *eof = 1;
 989         *start = page + off;
 990         len -= off;
 991         if (len > count)
 992                 len = count;
 993         if (len < 0)
 994                 len = 0;
 995         return len;
 996 }
 997
 998 static int proc_mf_change_side(struct file *file, const char __user *buffer,
 999                 unsigned long count, void *data)
1000 {
1001         char side;
1002         u64 newSide;
1003         struct vsp_cmd_data vsp_cmd;
1004
1005         if (!capable(CAP_SYS_ADMIN))
1006                 return -EACCES;
1007
1008         if (count == 0)
1009                 return 0;
1010
1011         if (get_user(side, buffer))
1012                 return -EFAULT;
1013
1014         switch (side) {
1015         case 'A':       newSide = 0;
1016                         break;
1017         case 'B':       newSide = 1;
1018                         break;
1019         case 'C':       newSide = 2;
1020                         break;
1021         case 'D':       newSide = 3;
1022                         break;
1023         default:
1024                 printk(KERN_ERR "mf_proc.c: proc_mf_change_side: invalid side\n");
1025                 return -EINVAL;
1026         }
1027
1028         memset(&vsp_cmd, 0, sizeof(vsp_cmd));
1029         vsp_cmd.sub_data.ipl_type = newSide;
1030         vsp_cmd.cmd = 10;
1031
1032         (void)signal_vsp_instruction(&vsp_cmd);
1033
1034         return count;
1035 }
1036
1037 #if 0
1038 static void mf_getSrcHistory(char *buffer, int size)
1039 {
1040         struct IplTypeReturnStuff return_stuff;
1041         struct pending_event *ev = new_pending_event();
1042         int rc = 0;
1043         char *pages[4];
1044
1045         pages[0] = kmalloc(4096, GFP_ATOMIC);
1046         pages[1] = kmalloc(4096, GFP_ATOMIC);
1047         pages[2] = kmalloc(4096, GFP_ATOMIC);
1048         pages[3] = kmalloc(4096, GFP_ATOMIC);
1049         if ((ev == NULL) || (pages[0] == NULL) || (pages[1] == NULL)
1050                          || (pages[2] == NULL) || (pages[3] == NULL))
1051                 return -ENOMEM;
1052
1053         return_stuff.xType = 0;
1054         return_stuff.xRc = 0;
1055         return_stuff.xDone = 0;
1056         ev->event.hp_lp_event.xSubtype = 6;
1057         ev->event.hp_lp_event.x.xSubtypeData =
1058                 subtype_data('M', 'F', 'V', 'I');
1059         ev->event.data.vsp_cmd.xEvent = &return_stuff;
1060         ev->event.data.vsp_cmd.cmd = 4;
1061         ev->event.data.vsp_cmd.lp_index = HvLpConfig_getLpIndex();
1062         ev->event.data.vsp_cmd.result_code = 0xFF;
1063         ev->event.data.vsp_cmd.reserved = 0;
1064         ev->event.data.vsp_cmd.sub_data.page[0] = ISERIES_HV_ADDR(pages[0]);
1065         ev->event.data.vsp_cmd.sub_data.page[1] = ISERIES_HV_ADDR(pages[1]);
1066         ev->event.data.vsp_cmd.sub_data.page[2] = ISERIES_HV_ADDR(pages[2]);
1067         ev->event.data.vsp_cmd.sub_data.page[3] = ISERIES_HV_ADDR(pages[3]);
1068         mb();
1069         if (signal_event(ev) != 0)
1070                 return;
1071
1072         while (return_stuff.xDone != 1)
1073                 udelay(10);
1074         if (return_stuff.xRc == 0)
1075                 memcpy(buffer, pages[0], size);
1076         kfree(pages[0]);
1077         kfree(pages[1]);
1078         kfree(pages[2]);
1079         kfree(pages[3]);
1080 }
1081 #endif
1082
1083 static int proc_mf_dump_src(char *page, char **start, off_t off,
1084                 int count, int *eof, void *data)
1085 {
1086 #if 0
1087         int len;
1088
1089         mf_getSrcHistory(page, count);
1090         len = count;
1091         len -= off;
1092         if (len < count) {
1093                 *eof = 1;
1094                 if (len <= 0)
1095                         return 0;
1096         } else
1097                 len = count;
1098         *start = page + off;
1099         return len;
1100 #else
1101         return 0;
1102 #endif
1103 }
1104
1105 static int proc_mf_change_src(struct file *file, const char __user *buffer,
1106                 unsigned long count, void *data)
1107 {
1108         char stkbuf[10];
1109
1110         if (!capable(CAP_SYS_ADMIN))
1111                 return -EACCES;
1112
1113         if ((count < 4) && (count != 1)) {
1114                 printk(KERN_ERR "mf_proc: invalid src\n");
1115                 return -EINVAL;
1116         }
1117
1118         if (count > (sizeof(stkbuf) - 1))
1119                 count = sizeof(stkbuf) - 1;
1120         if (copy_from_user(stkbuf, buffer, count))
1121                 return -EFAULT;
1122
1123         if ((count == 1) && (*stkbuf == '\0'))
1124                 mf_clear_src();
1125         else
1126                 mf_display_src(*(u32 *)stkbuf);
1127
1128         return count;
1129 }
1130
1131 static int proc_mf_change_cmdline(struct file *file, const char __user *buffer,
1132                 unsigned long count, void *data)
1133 {
1134         struct vsp_cmd_data vsp_cmd;
1135         dma_addr_t dma_addr;
1136         char *page;
1137         int ret = -EACCES;
1138
1139         if (!capable(CAP_SYS_ADMIN))
1140                 goto out;
1141
1142         dma_addr = 0;
1143         page = dma_alloc_coherent(iSeries_vio_dev, count, &dma_addr,
1144                         GFP_ATOMIC);
1145         ret = -ENOMEM;
1146         if (page == NULL)
1147                 goto out;
1148
1149         ret = -EFAULT;
1150         if (copy_from_user(page, buffer, count))
1151                 goto out_free;
1152
1153         memset(&vsp_cmd, 0, sizeof(vsp_cmd));
1154         vsp_cmd.cmd = 31;
1155         vsp_cmd.sub_data.kern.token = dma_addr;
1156         vsp_cmd.sub_data.kern.address_type = HvLpDma_AddressType_TceIndex;
1157         vsp_cmd.sub_data.kern.side = (u64)data;
1158         vsp_cmd.sub_data.kern.length = count;
1159         mb();
1160         (void)signal_vsp_instruction(&vsp_cmd);
1161         ret = count;
1162
1163 out_free:
1164         dma_free_coherent(iSeries_vio_dev, count, page, dma_addr);
1165 out:
1166         return ret;
1167 }
1168
1169 static ssize_t proc_mf_change_vmlinux(struct file *file,
1170                                       const char __user *buf,
1171                                       size_t count, loff_t *ppos)
1172 {
1173         struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode);
1174         ssize_t rc;
1175         dma_addr_t dma_addr;
1176         char *page;
1177         struct vsp_cmd_data vsp_cmd;
1178
1179         rc = -EACCES;
1180         if (!capable(CAP_SYS_ADMIN))
1181                 goto out;
1182
1183         dma_addr = 0;
1184         page = dma_alloc_coherent(iSeries_vio_dev, count, &dma_addr,
1185                         GFP_ATOMIC);
1186         rc = -ENOMEM;
1187         if (page == NULL) {
1188                 printk(KERN_ERR "mf.c: couldn't allocate memory to set vmlinux chunk\n");
1189                 goto out;
1190         }
1191         rc = -EFAULT;
1192         if (copy_from_user(page, buf, count))
1193                 goto out_free;
1194
1195         memset(&vsp_cmd, 0, sizeof(vsp_cmd));
1196         vsp_cmd.cmd = 30;
1197         vsp_cmd.sub_data.kern.token = dma_addr;
1198         vsp_cmd.sub_data.kern.address_type = HvLpDma_AddressType_TceIndex;
1199         vsp_cmd.sub_data.kern.side = (u64)dp->data;
1200         vsp_cmd.sub_data.kern.offset = *ppos;
1201         vsp_cmd.sub_data.kern.length = count;
1202         mb();
1203         rc = signal_vsp_instruction(&vsp_cmd);
1204         if (rc)
1205                 goto out_free;
1206         rc = -ENOMEM;
1207         if (vsp_cmd.result_code != 0)
1208                 goto out_free;
1209
1210         *ppos += count;
1211         rc = count;
1212 out_free:
1213         dma_free_coherent(iSeries_vio_dev, count, page, dma_addr);
1214 out:
1215         return rc;
1216 }
1217
1218 static struct file_operations proc_vmlinux_operations = {
1219         .write          = proc_mf_change_vmlinux,
1220 };
1221
1222 static int __init mf_proc_init(void)
1223 {
1224         struct proc_dir_entry *mf_proc_root;
1225         struct proc_dir_entry *ent;
1226         struct proc_dir_entry *mf;
1227         char name[2];
1228         int i;
1229
1230         mf_proc_root = proc_mkdir("iSeries/mf", NULL);
1231         if (!mf_proc_root)
1232                 return 1;
1233
1234         name[1] = '\0';
1235         for (i = 0; i < 4; i++) {
1236                 name[0] = 'A' + i;
1237                 mf = proc_mkdir(name, mf_proc_root);
1238                 if (!mf)
1239                         return 1;
1240
1241                 ent = create_proc_entry("cmdline", S_IFREG|S_IRUSR|S_IWUSR, mf);
1242                 if (!ent)
1243                         return 1;
1244                 ent->nlink = 1;
1245                 ent->data = (void *)(long)i;
1246                 ent->read_proc = proc_mf_dump_cmdline;
1247                 ent->write_proc = proc_mf_change_cmdline;
1248
1249                 if (i == 3)     /* no vmlinux entry for 'D' */
1250                         continue;
1251
1252                 ent = create_proc_entry("vmlinux", S_IFREG|S_IWUSR, mf);
1253                 if (!ent)
1254                         return 1;
1255                 ent->nlink = 1;
1256                 ent->data = (void *)(long)i;
1257                 ent->proc_fops = &proc_vmlinux_operations;
1258         }
1259
1260         ent = create_proc_entry("side", S_IFREG|S_IRUSR|S_IWUSR, mf_proc_root);
1261         if (!ent)
1262                 return 1;
1263         ent->nlink = 1;
1264         ent->data = (void *)0;
1265         ent->read_proc = proc_mf_dump_side;
1266         ent->write_proc = proc_mf_change_side;
1267
1268         ent = create_proc_entry("src", S_IFREG|S_IRUSR|S_IWUSR, mf_proc_root);
1269         if (!ent)
1270                 return 1;
1271         ent->nlink = 1;
1272         ent->data = (void *)0;
1273         ent->read_proc = proc_mf_dump_src;
1274         ent->write_proc = proc_mf_change_src;
1275
1276         return 0;
1277 }
1278
1279 __initcall(mf_proc_init);
1280
1281 #endif /* CONFIG_PROC_FS */