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