arch/powerpc/platforms/cell/spufs/switch.c

   1 /*
   2  * spu_switch.c
   3  *
   4  * (C) Copyright IBM Corp. 2005
   5  *
   6  * Author: Mark Nutter <mnutter@us.ibm.com>
   7  *
   8  * Host-side part of SPU context switch sequence outlined in
   9  * Synergistic Processor Element, Book IV.
  10  *
  11  * A fully premptive switch of an SPE is very expensive in terms
  12  * of time and system resources.  SPE Book IV indicates that SPE
  13  * allocation should follow a "serially reusable device" model,
  14  * in which the SPE is assigned a task until it completes.  When
  15  * this is not possible, this sequence may be used to premptively
  16  * save, and then later (optionally) restore the context of a
  17  * program executing on an SPE.
  18  *
  19  *
  20  * This program is free software; you can redistribute it and/or modify
  21  * it under the terms of the GNU General Public License as published by
  22  * the Free Software Foundation; either version 2, or (at your option)
  23  * any later version.
  24  *
  25  * This program is distributed in the hope that it will be useful,
  26  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  27  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  28  * GNU General Public License for more details.
  29  *
  30  * You should have received a copy of the GNU General Public License
  31  * along with this program; if not, write to the Free Software
  32  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  33  */
  34
  35 #include <linux/config.h>
  36 #include <linux/module.h>
  37 #include <linux/errno.h>
  38 #include <linux/sched.h>
  39 #include <linux/kernel.h>
  40 #include <linux/mm.h>
  41 #include <linux/vmalloc.h>
  42 #include <linux/smp.h>
  43 #include <linux/smp_lock.h>
  44 #include <linux/stddef.h>
  45 #include <linux/unistd.h>
  46
  47 #include <asm/io.h>
  48 #include <asm/spu.h>
  49 #include <asm/spu_priv1.h>
  50 #include <asm/spu_csa.h>
  51 #include <asm/mmu_context.h>
  52
  53 #include "spu_save_dump.h"
  54 #include "spu_restore_dump.h"
  55
  56 #if 0
  57 #define POLL_WHILE_TRUE(_c) {                           \
  58     do {                                                \
  59     } while (_c);                                       \
  60   }
  61 #else
  62 #define RELAX_SPIN_COUNT                                1000
  63 #define POLL_WHILE_TRUE(_c) {                           \
  64     do {                                                \
  65         int _i;                                         \
  66         for (_i=0; _i<RELAX_SPIN_COUNT && (_c); _i++) { \
  67             cpu_relax();                                \
  68         }                                               \
  69         if (unlikely(_c)) yield();                      \
  70         else break;                                     \
  71     } while (_c);                                       \
  72   }
  73 #endif                          /* debug */
  74
  75 #define POLL_WHILE_FALSE(_c)    POLL_WHILE_TRUE(!(_c))
  76
  77 static inline void acquire_spu_lock(struct spu *spu)
  78 {
  79         /* Save, Step 1:
  80          * Restore, Step 1:
  81          *    Acquire SPU-specific mutual exclusion lock.
  82          *    TBD.
  83          */
  84 }
  85
  86 static inline void release_spu_lock(struct spu *spu)
  87 {
  88         /* Restore, Step 76:
  89          *    Release SPU-specific mutual exclusion lock.
  90          *    TBD.
  91          */
  92 }
  93
  94 static inline int check_spu_isolate(struct spu_state *csa, struct spu *spu)
  95 {
  96         struct spu_problem __iomem *prob = spu->problem;
  97         u32 isolate_state;
  98
  99         /* Save, Step 2:
 100          * Save, Step 6:
 101          *     If SPU_Status[E,L,IS] any field is '1', this
 102          *     SPU is in isolate state and cannot be context
 103          *     saved at this time.
 104          */
 105         isolate_state = SPU_STATUS_ISOLATED_STATE |
 106             SPU_STATUS_ISOLATED_LOAD_STAUTUS | SPU_STATUS_ISOLATED_EXIT_STAUTUS;
 107         return (in_be32(&prob->spu_status_R) & isolate_state) ? 1 : 0;
 108 }
 109
 110 static inline void disable_interrupts(struct spu_state *csa, struct spu *spu)
 111 {
 112         /* Save, Step 3:
 113          * Restore, Step 2:
 114          *     Save INT_Mask_class0 in CSA.
 115          *     Write INT_MASK_class0 with value of 0.
 116          *     Save INT_Mask_class1 in CSA.
 117          *     Write INT_MASK_class1 with value of 0.
 118          *     Save INT_Mask_class2 in CSA.
 119          *     Write INT_MASK_class2 with value of 0.
 120          */
 121         spin_lock_irq(&spu->register_lock);
 122         if (csa) {
 123                 csa->priv1.int_mask_class0_RW = spu_int_mask_get(spu, 0);
 124                 csa->priv1.int_mask_class1_RW = spu_int_mask_get(spu, 1);
 125                 csa->priv1.int_mask_class2_RW = spu_int_mask_get(spu, 2);
 126         }
 127         spu_int_mask_set(spu, 0, 0ul);
 128         spu_int_mask_set(spu, 1, 0ul);
 129         spu_int_mask_set(spu, 2, 0ul);
 130         eieio();
 131         spin_unlock_irq(&spu->register_lock);
 132 }
 133
 134 static inline void set_watchdog_timer(struct spu_state *csa, struct spu *spu)
 135 {
 136         /* Save, Step 4:
 137          * Restore, Step 25.
 138          *    Set a software watchdog timer, which specifies the
 139          *    maximum allowable time for a context save sequence.
 140          *
 141          *    For present, this implementation will not set a global
 142          *    watchdog timer, as virtualization & variable system load
 143          *    may cause unpredictable execution times.
 144          */
 145 }
 146
 147 static inline void inhibit_user_access(struct spu_state *csa, struct spu *spu)
 148 {
 149         /* Save, Step 5:
 150          * Restore, Step 3:
 151          *     Inhibit user-space access (if provided) to this
 152          *     SPU by unmapping the virtual pages assigned to
 153          *     the SPU memory-mapped I/O (MMIO) for problem
 154          *     state. TBD.
 155          */
 156 }
 157
 158 static inline void set_switch_pending(struct spu_state *csa, struct spu *spu)
 159 {
 160         /* Save, Step 7:
 161          * Restore, Step 5:
 162          *     Set a software context switch pending flag.
 163          */
 164         set_bit(SPU_CONTEXT_SWITCH_PENDING, &spu->flags);
 165         mb();
 166 }
 167
 168 static inline void save_mfc_cntl(struct spu_state *csa, struct spu *spu)
 169 {
 170         struct spu_priv2 __iomem *priv2 = spu->priv2;
 171
 172         /* Save, Step 8:
 173          *     Suspend DMA and save MFC_CNTL.
 174          */
 175         switch (in_be64(&priv2->mfc_control_RW) &
 176                MFC_CNTL_SUSPEND_DMA_STATUS_MASK) {
 177         case MFC_CNTL_SUSPEND_IN_PROGRESS:
 178                 POLL_WHILE_FALSE((in_be64(&priv2->mfc_control_RW) &
 179                                   MFC_CNTL_SUSPEND_DMA_STATUS_MASK) ==
 180                                  MFC_CNTL_SUSPEND_COMPLETE);
 181                 /* fall through */
 182         case MFC_CNTL_SUSPEND_COMPLETE:
 183                 if (csa) {
 184                         csa->priv2.mfc_control_RW =
 185                                 in_be64(&priv2->mfc_control_RW) |
 186                                 MFC_CNTL_SUSPEND_DMA_QUEUE;
 187                 }
 188                 break;
 189         case MFC_CNTL_NORMAL_DMA_QUEUE_OPERATION:
 190                 out_be64(&priv2->mfc_control_RW, MFC_CNTL_SUSPEND_DMA_QUEUE);
 191                 POLL_WHILE_FALSE((in_be64(&priv2->mfc_control_RW) &
 192                                   MFC_CNTL_SUSPEND_DMA_STATUS_MASK) ==
 193                                  MFC_CNTL_SUSPEND_COMPLETE);
 194                 if (csa) {
 195                         csa->priv2.mfc_control_RW =
 196                                 in_be64(&priv2->mfc_control_RW) &
 197                                 ~MFC_CNTL_SUSPEND_DMA_QUEUE;
 198                 }
 199                 break;
 200         }
 201 }
 202
 203 static inline void save_spu_runcntl(struct spu_state *csa, struct spu *spu)
 204 {
 205         struct spu_problem __iomem *prob = spu->problem;
 206
 207         /* Save, Step 9:
 208          *     Save SPU_Runcntl in the CSA.  This value contains
 209          *     the "Application Desired State".
 210          */
 211         csa->prob.spu_runcntl_RW = in_be32(&prob->spu_runcntl_RW);
 212 }
 213
 214 static inline void save_mfc_sr1(struct spu_state *csa, struct spu *spu)
 215 {
 216         /* Save, Step 10:
 217          *     Save MFC_SR1 in the CSA.
 218          */
 219         csa->priv1.mfc_sr1_RW = spu_mfc_sr1_get(spu);
 220 }
 221
 222 static inline void save_spu_status(struct spu_state *csa, struct spu *spu)
 223 {
 224         struct spu_problem __iomem *prob = spu->problem;
 225
 226         /* Save, Step 11:
 227          *     Read SPU_Status[R], and save to CSA.
 228          */
 229         if ((in_be32(&prob->spu_status_R) & SPU_STATUS_RUNNING) == 0) {
 230                 csa->prob.spu_status_R = in_be32(&prob->spu_status_R);
 231         } else {
 232                 u32 stopped;
 233
 234                 out_be32(&prob->spu_runcntl_RW, SPU_RUNCNTL_STOP);
 235                 eieio();
 236                 POLL_WHILE_TRUE(in_be32(&prob->spu_status_R) &
 237                                 SPU_STATUS_RUNNING);
 238                 stopped =
 239                     SPU_STATUS_INVALID_INSTR | SPU_STATUS_SINGLE_STEP |
 240                     SPU_STATUS_STOPPED_BY_HALT | SPU_STATUS_STOPPED_BY_STOP;
 241                 if ((in_be32(&prob->spu_status_R) & stopped) == 0)
 242                         csa->prob.spu_status_R = SPU_STATUS_RUNNING;
 243                 else
 244                         csa->prob.spu_status_R = in_be32(&prob->spu_status_R);
 245         }
 246 }
 247
 248 static inline void save_mfc_decr(struct spu_state *csa, struct spu *spu)
 249 {
 250         struct spu_priv2 __iomem *priv2 = spu->priv2;
 251
 252         /* Save, Step 12:
 253          *     Read MFC_CNTL[Ds].  Update saved copy of
 254          *     CSA.MFC_CNTL[Ds].
 255          */
 256         if (in_be64(&priv2->mfc_control_RW) & MFC_CNTL_DECREMENTER_RUNNING) {
 257                 csa->priv2.mfc_control_RW |= MFC_CNTL_DECREMENTER_RUNNING;
 258                 csa->suspend_time = get_cycles();
 259                 out_be64(&priv2->spu_chnlcntptr_RW, 7ULL);
 260                 eieio();
 261                 csa->spu_chnldata_RW[7] = in_be64(&priv2->spu_chnldata_RW);
 262                 eieio();
 263         } else {
 264                 csa->priv2.mfc_control_RW &= ~MFC_CNTL_DECREMENTER_RUNNING;
 265         }
 266 }
 267
 268 static inline void halt_mfc_decr(struct spu_state *csa, struct spu *spu)
 269 {
 270         struct spu_priv2 __iomem *priv2 = spu->priv2;
 271
 272         /* Save, Step 13:
 273          *     Write MFC_CNTL[Dh] set to a '1' to halt
 274          *     the decrementer.
 275          */
 276         out_be64(&priv2->mfc_control_RW, MFC_CNTL_DECREMENTER_HALTED);
 277         eieio();
 278 }
 279
 280 static inline void save_timebase(struct spu_state *csa, struct spu *spu)
 281 {
 282         /* Save, Step 14:
 283          *    Read PPE Timebase High and Timebase low registers
 284          *    and save in CSA.  TBD.
 285          */
 286         csa->suspend_time = get_cycles();
 287 }
 288
 289 static inline void remove_other_spu_access(struct spu_state *csa,
 290                                            struct spu *spu)
 291 {
 292         /* Save, Step 15:
 293          *     Remove other SPU access to this SPU by unmapping
 294          *     this SPU's pages from their address space.  TBD.
 295          */
 296 }
 297
 298 static inline void do_mfc_mssync(struct spu_state *csa, struct spu *spu)
 299 {
 300         struct spu_problem __iomem *prob = spu->problem;
 301
 302         /* Save, Step 16:
 303          * Restore, Step 11.
 304          *     Write SPU_MSSync register. Poll SPU_MSSync[P]
 305          *     for a value of 0.
 306          */
 307         out_be64(&prob->spc_mssync_RW, 1UL);
 308         POLL_WHILE_TRUE(in_be64(&prob->spc_mssync_RW) & MS_SYNC_PENDING);
 309 }
 310
 311 static inline void issue_mfc_tlbie(struct spu_state *csa, struct spu *spu)
 312 {
 313         /* Save, Step 17:
 314          * Restore, Step 12.
 315          * Restore, Step 48.
 316          *     Write TLB_Invalidate_Entry[IS,VPN,L,Lp]=0 register.
 317          *     Then issue a PPE sync instruction.
 318          */
 319         spu_tlb_invalidate(spu);
 320         mb();
 321 }
 322
 323 static inline void handle_pending_interrupts(struct spu_state *csa,
 324                                              struct spu *spu)
 325 {
 326         /* Save, Step 18:
 327          *     Handle any pending interrupts from this SPU
 328          *     here.  This is OS or hypervisor specific.  One
 329          *     option is to re-enable interrupts to handle any
 330          *     pending interrupts, with the interrupt handlers
 331          *     recognizing the software Context Switch Pending
 332          *     flag, to ensure the SPU execution or MFC command
 333          *     queue is not restarted.  TBD.
 334          */
 335 }
 336
 337 static inline void save_mfc_queues(struct spu_state *csa, struct spu *spu)
 338 {
 339         struct spu_priv2 __iomem *priv2 = spu->priv2;
 340         int i;
 341
 342         /* Save, Step 19:
 343          *     If MFC_Cntl[Se]=0 then save
 344          *     MFC command queues.
 345          */
 346         if ((in_be64(&priv2->mfc_control_RW) & MFC_CNTL_DMA_QUEUES_EMPTY) == 0) {
 347                 for (i = 0; i < 8; i++) {
 348                         csa->priv2.puq[i].mfc_cq_data0_RW =
 349                             in_be64(&priv2->puq[i].mfc_cq_data0_RW);
 350                         csa->priv2.puq[i].mfc_cq_data1_RW =
 351                             in_be64(&priv2->puq[i].mfc_cq_data1_RW);
 352                         csa->priv2.puq[i].mfc_cq_data2_RW =
 353                             in_be64(&priv2->puq[i].mfc_cq_data2_RW);
 354                         csa->priv2.puq[i].mfc_cq_data3_RW =
 355                             in_be64(&priv2->puq[i].mfc_cq_data3_RW);
 356                 }
 357                 for (i = 0; i < 16; i++) {
 358                         csa->priv2.spuq[i].mfc_cq_data0_RW =
 359                             in_be64(&priv2->spuq[i].mfc_cq_data0_RW);
 360                         csa->priv2.spuq[i].mfc_cq_data1_RW =
 361                             in_be64(&priv2->spuq[i].mfc_cq_data1_RW);
 362                         csa->priv2.spuq[i].mfc_cq_data2_RW =
 363                             in_be64(&priv2->spuq[i].mfc_cq_data2_RW);
 364                         csa->priv2.spuq[i].mfc_cq_data3_RW =
 365                             in_be64(&priv2->spuq[i].mfc_cq_data3_RW);
 366                 }
 367         }
 368 }
 369
 370 static inline void save_ppu_querymask(struct spu_state *csa, struct spu *spu)
 371 {
 372         struct spu_problem __iomem *prob = spu->problem;
 373
 374         /* Save, Step 20:
 375          *     Save the PPU_QueryMask register
 376          *     in the CSA.
 377          */
 378         csa->prob.dma_querymask_RW = in_be32(&prob->dma_querymask_RW);
 379 }
 380
 381 static inline void save_ppu_querytype(struct spu_state *csa, struct spu *spu)
 382 {
 383         struct spu_problem __iomem *prob = spu->problem;
 384
 385         /* Save, Step 21:
 386          *     Save the PPU_QueryType register
 387          *     in the CSA.
 388          */
 389         csa->prob.dma_querytype_RW = in_be32(&prob->dma_querytype_RW);
 390 }
 391
 392 static inline void save_mfc_csr_tsq(struct spu_state *csa, struct spu *spu)
 393 {
 394         struct spu_priv2 __iomem *priv2 = spu->priv2;
 395
 396         /* Save, Step 22:
 397          *     Save the MFC_CSR_TSQ register
 398          *     in the LSCSA.
 399          */
 400         csa->priv2.spu_tag_status_query_RW =
 401             in_be64(&priv2->spu_tag_status_query_RW);
 402 }
 403
 404 static inline void save_mfc_csr_cmd(struct spu_state *csa, struct spu *spu)
 405 {
 406         struct spu_priv2 __iomem *priv2 = spu->priv2;
 407
 408         /* Save, Step 23:
 409          *     Save the MFC_CSR_CMD1 and MFC_CSR_CMD2
 410          *     registers in the CSA.
 411          */
 412         csa->priv2.spu_cmd_buf1_RW = in_be64(&priv2->spu_cmd_buf1_RW);
 413         csa->priv2.spu_cmd_buf2_RW = in_be64(&priv2->spu_cmd_buf2_RW);
 414 }
 415
 416 static inline void save_mfc_csr_ato(struct spu_state *csa, struct spu *spu)
 417 {
 418         struct spu_priv2 __iomem *priv2 = spu->priv2;
 419
 420         /* Save, Step 24:
 421          *     Save the MFC_CSR_ATO register in
 422          *     the CSA.
 423          */
 424         csa->priv2.spu_atomic_status_RW = in_be64(&priv2->spu_atomic_status_RW);
 425 }
 426
 427 static inline void save_mfc_tclass_id(struct spu_state *csa, struct spu *spu)
 428 {
 429         /* Save, Step 25:
 430          *     Save the MFC_TCLASS_ID register in
 431          *     the CSA.
 432          */
 433         csa->priv1.mfc_tclass_id_RW = spu_mfc_tclass_id_get(spu);
 434 }
 435
 436 static inline void set_mfc_tclass_id(struct spu_state *csa, struct spu *spu)
 437 {
 438         /* Save, Step 26:
 439          * Restore, Step 23.
 440          *     Write the MFC_TCLASS_ID register with
 441          *     the value 0x10000000.
 442          */
 443         spu_mfc_tclass_id_set(spu, 0x10000000);
 444         eieio();
 445 }
 446
 447 static inline void purge_mfc_queue(struct spu_state *csa, struct spu *spu)
 448 {
 449         struct spu_priv2 __iomem *priv2 = spu->priv2;
 450
 451         /* Save, Step 27:
 452          * Restore, Step 14.
 453          *     Write MFC_CNTL[Pc]=1 (purge queue).
 454          */
 455         out_be64(&priv2->mfc_control_RW, MFC_CNTL_PURGE_DMA_REQUEST);
 456         eieio();
 457 }
 458
 459 static inline void wait_purge_complete(struct spu_state *csa, struct spu *spu)
 460 {
 461         struct spu_priv2 __iomem *priv2 = spu->priv2;
 462
 463         /* Save, Step 28:
 464          *     Poll MFC_CNTL[Ps] until value '11' is read
 465          *     (purge complete).
 466          */
 467         POLL_WHILE_FALSE(in_be64(&priv2->mfc_control_RW) &
 468                          MFC_CNTL_PURGE_DMA_COMPLETE);
 469 }
 470
 471 static inline void save_mfc_slbs(struct spu_state *csa, struct spu *spu)
 472 {
 473         struct spu_priv2 __iomem *priv2 = spu->priv2;
 474         int i;
 475
 476         /* Save, Step 29:
 477          *     If MFC_SR1[R]='1', save SLBs in CSA.
 478          */
 479         if (spu_mfc_sr1_get(spu) & MFC_STATE1_RELOCATE_MASK) {
 480                 csa->priv2.slb_index_W = in_be64(&priv2->slb_index_W);
 481                 for (i = 0; i < 8; i++) {
 482                         out_be64(&priv2->slb_index_W, i);
 483                         eieio();
 484                         csa->slb_esid_RW[i] = in_be64(&priv2->slb_esid_RW);
 485                         csa->slb_vsid_RW[i] = in_be64(&priv2->slb_vsid_RW);
 486                         eieio();
 487                 }
 488         }
 489 }
 490
 491 static inline void setup_mfc_sr1(struct spu_state *csa, struct spu *spu)
 492 {
 493         /* Save, Step 30:
 494          * Restore, Step 18:
 495          *     Write MFC_SR1 with MFC_SR1[D=0,S=1] and
 496          *     MFC_SR1[TL,R,Pr,T] set correctly for the
 497          *     OS specific environment.
 498          *
 499          *     Implementation note: The SPU-side code
 500          *     for save/restore is privileged, so the
 501          *     MFC_SR1[Pr] bit is not set.
 502          *
 503          */
 504         spu_mfc_sr1_set(spu, (MFC_STATE1_MASTER_RUN_CONTROL_MASK |
 505                               MFC_STATE1_RELOCATE_MASK |
 506                               MFC_STATE1_BUS_TLBIE_MASK));
 507 }
 508
 509 static inline void save_spu_npc(struct spu_state *csa, struct spu *spu)
 510 {
 511         struct spu_problem __iomem *prob = spu->problem;
 512
 513         /* Save, Step 31:
 514          *     Save SPU_NPC in the CSA.
 515          */
 516         csa->prob.spu_npc_RW = in_be32(&prob->spu_npc_RW);
 517 }
 518
 519 static inline void save_spu_privcntl(struct spu_state *csa, struct spu *spu)
 520 {
 521         struct spu_priv2 __iomem *priv2 = spu->priv2;
 522
 523         /* Save, Step 32:
 524          *     Save SPU_PrivCntl in the CSA.
 525          */
 526         csa->priv2.spu_privcntl_RW = in_be64(&priv2->spu_privcntl_RW);
 527 }
 528
 529 static inline void reset_spu_privcntl(struct spu_state *csa, struct spu *spu)
 530 {
 531         struct spu_priv2 __iomem *priv2 = spu->priv2;
 532
 533         /* Save, Step 33:
 534          * Restore, Step 16:
 535          *     Write SPU_PrivCntl[S,Le,A] fields reset to 0.
 536          */
 537         out_be64(&priv2->spu_privcntl_RW, 0UL);
 538         eieio();
 539 }
 540
 541 static inline void save_spu_lslr(struct spu_state *csa, struct spu *spu)
 542 {
 543         struct spu_priv2 __iomem *priv2 = spu->priv2;
 544
 545         /* Save, Step 34:
 546          *     Save SPU_LSLR in the CSA.
 547          */
 548         csa->priv2.spu_lslr_RW = in_be64(&priv2->spu_lslr_RW);
 549 }
 550
 551 static inline void reset_spu_lslr(struct spu_state *csa, struct spu *spu)
 552 {
 553         struct spu_priv2 __iomem *priv2 = spu->priv2;
 554
 555         /* Save, Step 35:
 556          * Restore, Step 17.
 557          *     Reset SPU_LSLR.
 558          */
 559         out_be64(&priv2->spu_lslr_RW, LS_ADDR_MASK);
 560         eieio();
 561 }
 562
 563 static inline void save_spu_cfg(struct spu_state *csa, struct spu *spu)
 564 {
 565         struct spu_priv2 __iomem *priv2 = spu->priv2;
 566
 567         /* Save, Step 36:
 568          *     Save SPU_Cfg in the CSA.
 569          */
 570         csa->priv2.spu_cfg_RW = in_be64(&priv2->spu_cfg_RW);
 571 }
 572
 573 static inline void save_pm_trace(struct spu_state *csa, struct spu *spu)
 574 {
 575         /* Save, Step 37:
 576          *     Save PM_Trace_Tag_Wait_Mask in the CSA.
 577          *     Not performed by this implementation.
 578          */
 579 }
 580
 581 static inline void save_mfc_rag(struct spu_state *csa, struct spu *spu)
 582 {
 583         /* Save, Step 38:
 584          *     Save RA_GROUP_ID register and the
 585          *     RA_ENABLE reigster in the CSA.
 586          */
 587         csa->priv1.resource_allocation_groupID_RW =
 588                 spu_resource_allocation_groupID_get(spu);
 589         csa->priv1.resource_allocation_enable_RW =
 590                 spu_resource_allocation_enable_get(spu);
 591 }
 592
 593 static inline void save_ppu_mb_stat(struct spu_state *csa, struct spu *spu)
 594 {
 595         struct spu_problem __iomem *prob = spu->problem;
 596
 597         /* Save, Step 39:
 598          *     Save MB_Stat register in the CSA.
 599          */
 600         csa->prob.mb_stat_R = in_be32(&prob->mb_stat_R);
 601 }
 602
 603 static inline void save_ppu_mb(struct spu_state *csa, struct spu *spu)
 604 {
 605         struct spu_problem __iomem *prob = spu->problem;
 606
 607         /* Save, Step 40:
 608          *     Save the PPU_MB register in the CSA.
 609          */
 610         csa->prob.pu_mb_R = in_be32(&prob->pu_mb_R);
 611 }
 612
 613 static inline void save_ppuint_mb(struct spu_state *csa, struct spu *spu)
 614 {
 615         struct spu_priv2 __iomem *priv2 = spu->priv2;
 616
 617         /* Save, Step 41:
 618          *     Save the PPUINT_MB register in the CSA.
 619          */
 620         csa->priv2.puint_mb_R = in_be64(&priv2->puint_mb_R);
 621 }
 622
 623 static inline void save_ch_part1(struct spu_state *csa, struct spu *spu)
 624 {
 625         struct spu_priv2 __iomem *priv2 = spu->priv2;
 626         u64 idx, ch_indices[7] = { 0UL, 3UL, 4UL, 24UL, 25UL, 27UL };
 627         int i;
 628
 629         /* Save, Step 42:
 630          */
 631
 632         /* Save CH 1, without channel count */
 633         out_be64(&priv2->spu_chnlcntptr_RW, 1);
 634         csa->spu_chnldata_RW[1] = in_be64(&priv2->spu_chnldata_RW);
 635
 636         /* Save the following CH: [0,3,4,24,25,27] */
 637         for (i = 0; i < 7; i++) {
 638                 idx = ch_indices[i];
 639                 out_be64(&priv2->spu_chnlcntptr_RW, idx);
 640                 eieio();
 641                 csa->spu_chnldata_RW[idx] = in_be64(&priv2->spu_chnldata_RW);
 642                 csa->spu_chnlcnt_RW[idx] = in_be64(&priv2->spu_chnlcnt_RW);
 643                 out_be64(&priv2->spu_chnldata_RW, 0UL);
 644                 out_be64(&priv2->spu_chnlcnt_RW, 0UL);
 645                 eieio();
 646         }
 647 }
 648
 649 static inline void save_spu_mb(struct spu_state *csa, struct spu *spu)
 650 {
 651         struct spu_priv2 __iomem *priv2 = spu->priv2;
 652         int i;
 653
 654         /* Save, Step 43:
 655          *     Save SPU Read Mailbox Channel.
 656          */
 657         out_be64(&priv2->spu_chnlcntptr_RW, 29UL);
 658         eieio();
 659         csa->spu_chnlcnt_RW[29] = in_be64(&priv2->spu_chnlcnt_RW);
 660         for (i = 0; i < 4; i++) {
 661                 csa->spu_mailbox_data[i] = in_be64(&priv2->spu_chnldata_RW);
 662         }
 663         out_be64(&priv2->spu_chnlcnt_RW, 0UL);
 664         eieio();
 665 }
 666
 667 static inline void save_mfc_cmd(struct spu_state *csa, struct spu *spu)
 668 {
 669         struct spu_priv2 __iomem *priv2 = spu->priv2;
 670
 671         /* Save, Step 44:
 672          *     Save MFC_CMD Channel.
 673          */
 674         out_be64(&priv2->spu_chnlcntptr_RW, 21UL);
 675         eieio();
 676         csa->spu_chnlcnt_RW[21] = in_be64(&priv2->spu_chnlcnt_RW);
 677         eieio();
 678 }
 679
 680 static inline void reset_ch(struct spu_state *csa, struct spu *spu)
 681 {
 682         struct spu_priv2 __iomem *priv2 = spu->priv2;
 683         u64 ch_indices[4] = { 21UL, 23UL, 28UL, 30UL };
 684         u64 ch_counts[4] = { 16UL, 1UL, 1UL, 1UL };
 685         u64 idx;
 686         int i;
 687
 688         /* Save, Step 45:
 689          *     Reset the following CH: [21, 23, 28, 30]
 690          */
 691         for (i = 0; i < 4; i++) {
 692                 idx = ch_indices[i];
 693                 out_be64(&priv2->spu_chnlcntptr_RW, idx);
 694                 eieio();
 695                 out_be64(&priv2->spu_chnlcnt_RW, ch_counts[i]);
 696                 eieio();
 697         }
 698 }
 699
 700 static inline void resume_mfc_queue(struct spu_state *csa, struct spu *spu)
 701 {
 702         struct spu_priv2 __iomem *priv2 = spu->priv2;
 703
 704         /* Save, Step 46:
 705          * Restore, Step 25.
 706          *     Write MFC_CNTL[Sc]=0 (resume queue processing).
 707          */
 708         out_be64(&priv2->mfc_control_RW, MFC_CNTL_RESUME_DMA_QUEUE);
 709 }
 710
 711 static inline void invalidate_slbs(struct spu_state *csa, struct spu *spu)
 712 {
 713         struct spu_priv2 __iomem *priv2 = spu->priv2;
 714
 715         /* Save, Step 45:
 716          * Restore, Step 19:
 717          *     If MFC_SR1[R]=1, write 0 to SLB_Invalidate_All.
 718          */
 719         if (spu_mfc_sr1_get(spu) & MFC_STATE1_RELOCATE_MASK) {
 720                 out_be64(&priv2->slb_invalidate_all_W, 0UL);
 721                 eieio();
 722         }
 723 }
 724
 725 static inline void get_kernel_slb(u64 ea, u64 slb[2])
 726 {
 727         u64 llp;
 728
 729         if (REGION_ID(ea) == KERNEL_REGION_ID)
 730                 llp = mmu_psize_defs[mmu_linear_psize].sllp;
 731         else
 732                 llp = mmu_psize_defs[mmu_virtual_psize].sllp;
 733         slb[0] = (get_kernel_vsid(ea) << SLB_VSID_SHIFT) |
 734                 SLB_VSID_KERNEL | llp;
 735         slb[1] = (ea & ESID_MASK) | SLB_ESID_V;
 736 }
 737
 738 static inline void load_mfc_slb(struct spu *spu, u64 slb[2], int slbe)
 739 {
 740         struct spu_priv2 __iomem *priv2 = spu->priv2;
 741
 742         out_be64(&priv2->slb_index_W, slbe);
 743         eieio();
 744         out_be64(&priv2->slb_vsid_RW, slb[0]);
 745         out_be64(&priv2->slb_esid_RW, slb[1]);
 746         eieio();
 747 }
 748
 749 static inline void setup_mfc_slbs(struct spu_state *csa, struct spu *spu)
 750 {
 751         u64 code_slb[2];
 752         u64 lscsa_slb[2];
 753
 754         /* Save, Step 47:
 755          * Restore, Step 30.
 756          *     If MFC_SR1[R]=1, write 0 to SLB_Invalidate_All
 757          *     register, then initialize SLB_VSID and SLB_ESID
 758          *     to provide access to SPU context save code and
 759          *     LSCSA.
 760          *
 761          *     This implementation places both the context
 762          *     switch code and LSCSA in kernel address space.
 763          *
 764          *     Further this implementation assumes that the
 765          *     MFC_SR1[R]=1 (in other words, assume that
 766          *     translation is desired by OS environment).
 767          */
 768         invalidate_slbs(csa, spu);
 769         get_kernel_slb((unsigned long)&spu_save_code[0], code_slb);
 770         get_kernel_slb((unsigned long)csa->lscsa, lscsa_slb);
 771         load_mfc_slb(spu, code_slb, 0);
 772         if ((lscsa_slb[0] != code_slb[0]) || (lscsa_slb[1] != code_slb[1]))
 773                 load_mfc_slb(spu, lscsa_slb, 1);
 774 }
 775
 776 static inline void set_switch_active(struct spu_state *csa, struct spu *spu)
 777 {
 778         /* Save, Step 48:
 779          * Restore, Step 23.
 780          *     Change the software context switch pending flag
 781          *     to context switch active.
 782          */
 783         set_bit(SPU_CONTEXT_SWITCH_ACTIVE, &spu->flags);
 784         clear_bit(SPU_CONTEXT_SWITCH_PENDING, &spu->flags);
 785         mb();
 786 }
 787
 788 static inline void enable_interrupts(struct spu_state *csa, struct spu *spu)
 789 {
 790         unsigned long class1_mask = CLASS1_ENABLE_SEGMENT_FAULT_INTR |
 791             CLASS1_ENABLE_STORAGE_FAULT_INTR;
 792
 793         /* Save, Step 49:
 794          * Restore, Step 22:
 795          *     Reset and then enable interrupts, as
 796          *     needed by OS.
 797          *
 798          *     This implementation enables only class1
 799          *     (translation) interrupts.
 800          */
 801         spin_lock_irq(&spu->register_lock);
 802         spu_int_stat_clear(spu, 0, ~0ul);
 803         spu_int_stat_clear(spu, 1, ~0ul);
 804         spu_int_stat_clear(spu, 2, ~0ul);
 805         spu_int_mask_set(spu, 0, 0ul);
 806         spu_int_mask_set(spu, 1, class1_mask);
 807         spu_int_mask_set(spu, 2, 0ul);
 808         spin_unlock_irq(&spu->register_lock);
 809 }
 810
 811 static inline int send_mfc_dma(struct spu *spu, unsigned long ea,
 812                                unsigned int ls_offset, unsigned int size,
 813                                unsigned int tag, unsigned int rclass,
 814                                unsigned int cmd)
 815 {
 816         struct spu_problem __iomem *prob = spu->problem;
 817         union mfc_tag_size_class_cmd command;
 818         unsigned int transfer_size;
 819         volatile unsigned int status = 0x0;
 820
 821         while (size > 0) {
 822                 transfer_size =
 823                     (size > MFC_MAX_DMA_SIZE) ? MFC_MAX_DMA_SIZE : size;
 824                 command.u.mfc_size = transfer_size;
 825                 command.u.mfc_tag = tag;
 826                 command.u.mfc_rclassid = rclass;
 827                 command.u.mfc_cmd = cmd;
 828                 do {
 829                         out_be32(&prob->mfc_lsa_W, ls_offset);
 830                         out_be64(&prob->mfc_ea_W, ea);
 831                         out_be64(&prob->mfc_union_W.all64, command.all64);
 832                         status =
 833                             in_be32(&prob->mfc_union_W.by32.mfc_class_cmd32);
 834                         if (unlikely(status & 0x2)) {
 835                                 cpu_relax();
 836                         }
 837                 } while (status & 0x3);
 838                 size -= transfer_size;
 839                 ea += transfer_size;
 840                 ls_offset += transfer_size;
 841         }
 842         return 0;
 843 }
 844
 845 static inline void save_ls_16kb(struct spu_state *csa, struct spu *spu)
 846 {
 847         unsigned long addr = (unsigned long)&csa->lscsa->ls[0];
 848         unsigned int ls_offset = 0x0;
 849         unsigned int size = 16384;
 850         unsigned int tag = 0;
 851         unsigned int rclass = 0;
 852         unsigned int cmd = MFC_PUT_CMD;
 853
 854         /* Save, Step 50:
 855          *     Issue a DMA command to copy the first 16K bytes
 856          *     of local storage to the CSA.
 857          */
 858         send_mfc_dma(spu, addr, ls_offset, size, tag, rclass, cmd);
 859 }
 860
 861 static inline void set_spu_npc(struct spu_state *csa, struct spu *spu)
 862 {
 863         struct spu_problem __iomem *prob = spu->problem;
 864
 865         /* Save, Step 51:
 866          * Restore, Step 31.
 867          *     Write SPU_NPC[IE]=0 and SPU_NPC[LSA] to entry
 868          *     point address of context save code in local
 869          *     storage.
 870          *
 871          *     This implementation uses SPU-side save/restore
 872          *     programs with entry points at LSA of 0.
 873          */
 874         out_be32(&prob->spu_npc_RW, 0);
 875         eieio();
 876 }
 877
 878 static inline void set_signot1(struct spu_state *csa, struct spu *spu)
 879 {
 880         struct spu_problem __iomem *prob = spu->problem;
 881         union {
 882                 u64 ull;
 883                 u32 ui[2];
 884         } addr64;
 885
 886         /* Save, Step 52:
 887          * Restore, Step 32:
 888          *    Write SPU_Sig_Notify_1 register with upper 32-bits
 889          *    of the CSA.LSCSA effective address.
 890          */
 891         addr64.ull = (u64) csa->lscsa;
 892         out_be32(&prob->signal_notify1, addr64.ui[0]);
 893         eieio();
 894 }
 895
 896 static inline void set_signot2(struct spu_state *csa, struct spu *spu)
 897 {
 898         struct spu_problem __iomem *prob = spu->problem;
 899         union {
 900                 u64 ull;
 901                 u32 ui[2];
 902         } addr64;
 903
 904         /* Save, Step 53:
 905          * Restore, Step 33:
 906          *    Write SPU_Sig_Notify_2 register with lower 32-bits
 907          *    of the CSA.LSCSA effective address.
 908          */
 909         addr64.ull = (u64) csa->lscsa;
 910         out_be32(&prob->signal_notify2, addr64.ui[1]);
 911         eieio();
 912 }
 913
 914 static inline void send_save_code(struct spu_state *csa, struct spu *spu)
 915 {
 916         unsigned long addr = (unsigned long)&spu_save_code[0];
 917         unsigned int ls_offset = 0x0;
 918         unsigned int size = sizeof(spu_save_code);
 919         unsigned int tag = 0;
 920         unsigned int rclass = 0;
 921         unsigned int cmd = MFC_GETFS_CMD;
 922
 923         /* Save, Step 54:
 924          *     Issue a DMA command to copy context save code
 925          *     to local storage and start SPU.
 926          */
 927         send_mfc_dma(spu, addr, ls_offset, size, tag, rclass, cmd);
 928 }
 929
 930 static inline void set_ppu_querymask(struct spu_state *csa, struct spu *spu)
 931 {
 932         struct spu_problem __iomem *prob = spu->problem;
 933
 934         /* Save, Step 55:
 935          * Restore, Step 38.
 936          *     Write PPU_QueryMask=1 (enable Tag Group 0)
 937          *     and issue eieio instruction.
 938          */
 939         out_be32(&prob->dma_querymask_RW, MFC_TAGID_TO_TAGMASK(0));
 940         eieio();
 941 }
 942
 943 static inline void wait_tag_complete(struct spu_state *csa, struct spu *spu)
 944 {
 945         struct spu_problem __iomem *prob = spu->problem;
 946         u32 mask = MFC_TAGID_TO_TAGMASK(0);
 947         unsigned long flags;
 948
 949         /* Save, Step 56:
 950          * Restore, Step 39.
 951          * Restore, Step 39.
 952          * Restore, Step 46.
 953          *     Poll PPU_TagStatus[gn] until 01 (Tag group 0 complete)
 954          *     or write PPU_QueryType[TS]=01 and wait for Tag Group
 955          *     Complete Interrupt.  Write INT_Stat_Class0 or
 956          *     INT_Stat_Class2 with value of 'handled'.
 957          */
 958         POLL_WHILE_FALSE(in_be32(&prob->dma_tagstatus_R) & mask);
 959
 960         local_irq_save(flags);
 961         spu_int_stat_clear(spu, 0, ~(0ul));
 962         spu_int_stat_clear(spu, 2, ~(0ul));
 963         local_irq_restore(flags);
 964 }
 965
 966 static inline void wait_spu_stopped(struct spu_state *csa, struct spu *spu)
 967 {
 968         struct spu_problem __iomem *prob = spu->problem;
 969         unsigned long flags;
 970
 971         /* Save, Step 57:
 972          * Restore, Step 40.
 973          *     Poll until SPU_Status[R]=0 or wait for SPU Class 0
 974          *     or SPU Class 2 interrupt.  Write INT_Stat_class0
 975          *     or INT_Stat_class2 with value of handled.
 976          */
 977         POLL_WHILE_TRUE(in_be32(&prob->spu_status_R) & SPU_STATUS_RUNNING);
 978
 979         local_irq_save(flags);
 980         spu_int_stat_clear(spu, 0, ~(0ul));
 981         spu_int_stat_clear(spu, 2, ~(0ul));
 982         local_irq_restore(flags);
 983 }
 984
 985 static inline int check_save_status(struct spu_state *csa, struct spu *spu)
 986 {
 987         struct spu_problem __iomem *prob = spu->problem;
 988         u32 complete;
 989
 990         /* Save, Step 54:
 991          *     If SPU_Status[P]=1 and SPU_Status[SC] = "success",
 992          *     context save succeeded, otherwise context save
 993          *     failed.
 994          */
 995         complete = ((SPU_SAVE_COMPLETE << SPU_STOP_STATUS_SHIFT) |
 996                     SPU_STATUS_STOPPED_BY_STOP);
 997         return (in_be32(&prob->spu_status_R) != complete) ? 1 : 0;
 998 }
 999
1000 static inline void terminate_spu_app(struct spu_state *csa, struct spu *spu)
1001 {
1002         /* Restore, Step 4:
1003          *    If required, notify the "using application" that
1004          *    the SPU task has been terminated.  TBD.
1005          */
1006 }
1007
1008 static inline void suspend_mfc(struct spu_state *csa, struct spu *spu)
1009 {
1010         struct spu_priv2 __iomem *priv2 = spu->priv2;
1011
1012         /* Restore, Step 7:
1013          * Restore, Step 47.
1014          *     Write MFC_Cntl[Dh,Sc]='1','1' to suspend
1015          *     the queue and halt the decrementer.
1016          */
1017         out_be64(&priv2->mfc_control_RW, MFC_CNTL_SUSPEND_DMA_QUEUE |
1018                  MFC_CNTL_DECREMENTER_HALTED);
1019         eieio();
1020 }
1021
1022 static inline void wait_suspend_mfc_complete(struct spu_state *csa,
1023                                              struct spu *spu)
1024 {
1025         struct spu_priv2 __iomem *priv2 = spu->priv2;
1026
1027         /* Restore, Step 8:
1028          * Restore, Step 47.
1029          *     Poll MFC_CNTL[Ss] until 11 is returned.
1030          */
1031         POLL_WHILE_FALSE(in_be64(&priv2->mfc_control_RW) &
1032                          MFC_CNTL_SUSPEND_COMPLETE);
1033 }
1034
1035 static inline int suspend_spe(struct spu_state *csa, struct spu *spu)
1036 {
1037         struct spu_problem __iomem *prob = spu->problem;
1038
1039         /* Restore, Step 9:
1040          *    If SPU_Status[R]=1, stop SPU execution
1041          *    and wait for stop to complete.
1042          *
1043          *    Returns       1 if SPU_Status[R]=1 on entry.
1044          *                  0 otherwise
1045          */
1046         if (in_be32(&prob->spu_status_R) & SPU_STATUS_RUNNING) {
1047                 if (in_be32(&prob->spu_status_R) &
1048                     SPU_STATUS_ISOLATED_EXIT_STAUTUS) {
1049                         POLL_WHILE_TRUE(in_be32(&prob->spu_status_R) &
1050                                         SPU_STATUS_RUNNING);
1051                 }
1052                 if ((in_be32(&prob->spu_status_R) &
1053                      SPU_STATUS_ISOLATED_LOAD_STAUTUS)
1054                     || (in_be32(&prob->spu_status_R) &
1055                         SPU_STATUS_ISOLATED_STATE)) {
1056                         out_be32(&prob->spu_runcntl_RW, SPU_RUNCNTL_STOP);
1057                         eieio();
1058                         POLL_WHILE_TRUE(in_be32(&prob->spu_status_R) &
1059                                         SPU_STATUS_RUNNING);
1060                         out_be32(&prob->spu_runcntl_RW, 0x2);
1061                         eieio();
1062                         POLL_WHILE_TRUE(in_be32(&prob->spu_status_R) &
1063                                         SPU_STATUS_RUNNING);
1064                 }
1065                 if (in_be32(&prob->spu_status_R) &
1066                     SPU_STATUS_WAITING_FOR_CHANNEL) {
1067                         out_be32(&prob->spu_runcntl_RW, SPU_RUNCNTL_STOP);
1068                         eieio();
1069                         POLL_WHILE_TRUE(in_be32(&prob->spu_status_R) &
1070                                         SPU_STATUS_RUNNING);
1071                 }
1072                 return 1;
1073         }
1074         return 0;
1075 }
1076
1077 static inline void clear_spu_status(struct spu_state *csa, struct spu *spu)
1078 {
1079         struct spu_problem __iomem *prob = spu->problem;
1080
1081         /* Restore, Step 10:
1082          *    If SPU_Status[R]=0 and SPU_Status[E,L,IS]=1,
1083          *    release SPU from isolate state.
1084          */
1085         if (!(in_be32(&prob->spu_status_R) & SPU_STATUS_RUNNING)) {
1086                 if (in_be32(&prob->spu_status_R) &
1087                     SPU_STATUS_ISOLATED_EXIT_STAUTUS) {
1088                         spu_mfc_sr1_set(spu,
1089                                         MFC_STATE1_MASTER_RUN_CONTROL_MASK);
1090                         eieio();
1091                         out_be32(&prob->spu_runcntl_RW, SPU_RUNCNTL_RUNNABLE);
1092                         eieio();
1093                         POLL_WHILE_TRUE(in_be32(&prob->spu_status_R) &
1094                                         SPU_STATUS_RUNNING);
1095                 }
1096                 if ((in_be32(&prob->spu_status_R) &
1097                      SPU_STATUS_ISOLATED_LOAD_STAUTUS)
1098                     || (in_be32(&prob->spu_status_R) &
1099                         SPU_STATUS_ISOLATED_STATE)) {
1100                         spu_mfc_sr1_set(spu,
1101                                         MFC_STATE1_MASTER_RUN_CONTROL_MASK);
1102                         eieio();
1103                         out_be32(&prob->spu_runcntl_RW, 0x2);
1104                         eieio();
1105                         POLL_WHILE_TRUE(in_be32(&prob->spu_status_R) &
1106                                         SPU_STATUS_RUNNING);
1107                 }
1108         }
1109 }
1110
1111 static inline void reset_ch_part1(struct spu_state *csa, struct spu *spu)
1112 {
1113         struct spu_priv2 __iomem *priv2 = spu->priv2;
1114         u64 ch_indices[7] = { 0UL, 3UL, 4UL, 24UL, 25UL, 27UL };
1115         u64 idx;
1116         int i;
1117
1118         /* Restore, Step 20:
1119          */
1120
1121         /* Reset CH 1 */
1122         out_be64(&priv2->spu_chnlcntptr_RW, 1);
1123         out_be64(&priv2->spu_chnldata_RW, 0UL);
1124
1125         /* Reset the following CH: [0,3,4,24,25,27] */
1126         for (i = 0; i < 7; i++) {
1127                 idx = ch_indices[i];
1128                 out_be64(&priv2->spu_chnlcntptr_RW, idx);
1129                 eieio();
1130                 out_be64(&priv2->spu_chnldata_RW, 0UL);
1131                 out_be64(&priv2->spu_chnlcnt_RW, 0UL);
1132                 eieio();
1133         }
1134 }
1135
1136 static inline void reset_ch_part2(struct spu_state *csa, struct spu *spu)
1137 {
1138         struct spu_priv2 __iomem *priv2 = spu->priv2;
1139         u64 ch_indices[5] = { 21UL, 23UL, 28UL, 29UL, 30UL };
1140         u64 ch_counts[5] = { 16UL, 1UL, 1UL, 0UL, 1UL };
1141         u64 idx;
1142         int i;
1143
1144         /* Restore, Step 21:
1145          *     Reset the following CH: [21, 23, 28, 29, 30]
1146          */
1147         for (i = 0; i < 5; i++) {
1148                 idx = ch_indices[i];
1149                 out_be64(&priv2->spu_chnlcntptr_RW, idx);
1150                 eieio();
1151                 out_be64(&priv2->spu_chnlcnt_RW, ch_counts[i]);
1152                 eieio();
1153         }
1154 }
1155
1156 static inline void setup_spu_status_part1(struct spu_state *csa,
1157                                           struct spu *spu)
1158 {
1159         u32 status_P = SPU_STATUS_STOPPED_BY_STOP;
1160         u32 status_I = SPU_STATUS_INVALID_INSTR;
1161         u32 status_H = SPU_STATUS_STOPPED_BY_HALT;
1162         u32 status_S = SPU_STATUS_SINGLE_STEP;
1163         u32 status_S_I = SPU_STATUS_SINGLE_STEP | SPU_STATUS_INVALID_INSTR;
1164         u32 status_S_P = SPU_STATUS_SINGLE_STEP | SPU_STATUS_STOPPED_BY_STOP;
1165         u32 status_P_H = SPU_STATUS_STOPPED_BY_HALT |SPU_STATUS_STOPPED_BY_STOP;
1166         u32 status_P_I = SPU_STATUS_STOPPED_BY_STOP |SPU_STATUS_INVALID_INSTR;
1167         u32 status_code;
1168
1169         /* Restore, Step 27:
1170          *     If the CSA.SPU_Status[I,S,H,P]=1 then add the correct
1171          *     instruction sequence to the end of the SPU based restore
1172          *     code (after the "context restored" stop and signal) to
1173          *     restore the correct SPU status.
1174          *
1175          *     NOTE: Rather than modifying the SPU executable, we
1176          *     instead add a new 'stopped_status' field to the
1177          *     LSCSA.  The SPU-side restore reads this field and
1178          *     takes the appropriate action when exiting.
1179          */
1180
1181         status_code =
1182             (csa->prob.spu_status_R >> SPU_STOP_STATUS_SHIFT) & 0xFFFF;
1183         if ((csa->prob.spu_status_R & status_P_I) == status_P_I) {
1184
1185                 /* SPU_Status[P,I]=1 - Illegal Instruction followed
1186                  * by Stop and Signal instruction, followed by 'br -4'.
1187                  *
1188                  */
1189                 csa->lscsa->stopped_status.slot[0] = SPU_STOPPED_STATUS_P_I;
1190                 csa->lscsa->stopped_status.slot[1] = status_code;
1191
1192         } else if ((csa->prob.spu_status_R & status_P_H) == status_P_H) {
1193
1194                 /* SPU_Status[P,H]=1 - Halt Conditional, followed
1195                  * by Stop and Signal instruction, followed by
1196                  * 'br -4'.
1197                  */
1198                 csa->lscsa->stopped_status.slot[0] = SPU_STOPPED_STATUS_P_H;
1199                 csa->lscsa->stopped_status.slot[1] = status_code;
1200
1201         } else if ((csa->prob.spu_status_R & status_S_P) == status_S_P) {
1202
1203                 /* SPU_Status[S,P]=1 - Stop and Signal instruction
1204                  * followed by 'br -4'.
1205                  */
1206                 csa->lscsa->stopped_status.slot[0] = SPU_STOPPED_STATUS_S_P;
1207                 csa->lscsa->stopped_status.slot[1] = status_code;
1208
1209         } else if ((csa->prob.spu_status_R & status_S_I) == status_S_I) {
1210
1211                 /* SPU_Status[S,I]=1 - Illegal instruction followed
1212                  * by 'br -4'.
1213                  */
1214                 csa->lscsa->stopped_status.slot[0] = SPU_STOPPED_STATUS_S_I;
1215                 csa->lscsa->stopped_status.slot[1] = status_code;
1216
1217         } else if ((csa->prob.spu_status_R & status_P) == status_P) {
1218
1219                 /* SPU_Status[P]=1 - Stop and Signal instruction
1220                  * followed by 'br -4'.
1221                  */
1222                 csa->lscsa->stopped_status.slot[0] = SPU_STOPPED_STATUS_P;
1223                 csa->lscsa->stopped_status.slot[1] = status_code;
1224
1225         } else if ((csa->prob.spu_status_R & status_H) == status_H) {
1226
1227                 /* SPU_Status[H]=1 - Halt Conditional, followed
1228                  * by 'br -4'.
1229                  */
1230                 csa->lscsa->stopped_status.slot[0] = SPU_STOPPED_STATUS_H;
1231
1232         } else if ((csa->prob.spu_status_R & status_S) == status_S) {
1233
1234                 /* SPU_Status[S]=1 - Two nop instructions.
1235                  */
1236                 csa->lscsa->stopped_status.slot[0] = SPU_STOPPED_STATUS_S;
1237
1238         } else if ((csa->prob.spu_status_R & status_I) == status_I) {
1239
1240                 /* SPU_Status[I]=1 - Illegal instruction followed
1241                  * by 'br -4'.
1242                  */
1243                 csa->lscsa->stopped_status.slot[0] = SPU_STOPPED_STATUS_I;
1244
1245         }
1246 }
1247
1248 static inline void setup_spu_status_part2(struct spu_state *csa,
1249                                           struct spu *spu)
1250 {
1251         u32 mask;
1252
1253         /* Restore, Step 28:
1254          *     If the CSA.SPU_Status[I,S,H,P,R]=0 then
1255          *     add a 'br *' instruction to the end of
1256          *     the SPU based restore code.
1257          *
1258          *     NOTE: Rather than modifying the SPU executable, we
1259          *     instead add a new 'stopped_status' field to the
1260          *     LSCSA.  The SPU-side restore reads this field and
1261          *     takes the appropriate action when exiting.
1262          */
1263         mask = SPU_STATUS_INVALID_INSTR |
1264             SPU_STATUS_SINGLE_STEP |
1265             SPU_STATUS_STOPPED_BY_HALT |
1266             SPU_STATUS_STOPPED_BY_STOP | SPU_STATUS_RUNNING;
1267         if (!(csa->prob.spu_status_R & mask)) {
1268                 csa->lscsa->stopped_status.slot[0] = SPU_STOPPED_STATUS_R;
1269         }
1270 }
1271
1272 static inline void restore_mfc_rag(struct spu_state *csa, struct spu *spu)
1273 {
1274         /* Restore, Step 29:
1275          *     Restore RA_GROUP_ID register and the
1276          *     RA_ENABLE reigster from the CSA.
1277          */
1278         spu_resource_allocation_groupID_set(spu,
1279                         csa->priv1.resource_allocation_groupID_RW);
1280         spu_resource_allocation_enable_set(spu,
1281                         csa->priv1.resource_allocation_enable_RW);
1282 }
1283
1284 static inline void send_restore_code(struct spu_state *csa, struct spu *spu)
1285 {
1286         unsigned long addr = (unsigned long)&spu_restore_code[0];
1287         unsigned int ls_offset = 0x0;
1288         unsigned int size = sizeof(spu_restore_code);
1289         unsigned int tag = 0;
1290         unsigned int rclass = 0;
1291         unsigned int cmd = MFC_GETFS_CMD;
1292
1293         /* Restore, Step 37:
1294          *     Issue MFC DMA command to copy context
1295          *     restore code to local storage.
1296          */
1297         send_mfc_dma(spu, addr, ls_offset, size, tag, rclass, cmd);
1298 }
1299
1300 static inline void setup_decr(struct spu_state *csa, struct spu *spu)
1301 {
1302         /* Restore, Step 34:
1303          *     If CSA.MFC_CNTL[Ds]=1 (decrementer was
1304          *     running) then adjust decrementer, set
1305          *     decrementer running status in LSCSA,
1306          *     and set decrementer "wrapped" status
1307          *     in LSCSA.
1308          */
1309         if (csa->priv2.mfc_control_RW & MFC_CNTL_DECREMENTER_RUNNING) {
1310                 cycles_t resume_time = get_cycles();
1311                 cycles_t delta_time = resume_time - csa->suspend_time;
1312
1313                 csa->lscsa->decr.slot[0] -= delta_time;
1314         }
1315 }
1316
1317 static inline void setup_ppu_mb(struct spu_state *csa, struct spu *spu)
1318 {
1319         /* Restore, Step 35:
1320          *     Copy the CSA.PU_MB data into the LSCSA.
1321          */
1322         csa->lscsa->ppu_mb.slot[0] = csa->prob.pu_mb_R;
1323 }
1324
1325 static inline void setup_ppuint_mb(struct spu_state *csa, struct spu *spu)
1326 {
1327         /* Restore, Step 36:
1328          *     Copy the CSA.PUINT_MB data into the LSCSA.
1329          */
1330         csa->lscsa->ppuint_mb.slot[0] = csa->priv2.puint_mb_R;
1331 }
1332
1333 static inline int check_restore_status(struct spu_state *csa, struct spu *spu)
1334 {
1335         struct spu_problem __iomem *prob = spu->problem;
1336         u32 complete;
1337
1338         /* Restore, Step 40:
1339          *     If SPU_Status[P]=1 and SPU_Status[SC] = "success",
1340          *     context restore succeeded, otherwise context restore
1341          *     failed.
1342          */
1343         complete = ((SPU_RESTORE_COMPLETE << SPU_STOP_STATUS_SHIFT) |
1344                     SPU_STATUS_STOPPED_BY_STOP);
1345         return (in_be32(&prob->spu_status_R) != complete) ? 1 : 0;
1346 }
1347
1348 static inline void restore_spu_privcntl(struct spu_state *csa, struct spu *spu)
1349 {
1350         struct spu_priv2 __iomem *priv2 = spu->priv2;
1351
1352         /* Restore, Step 41:
1353          *     Restore SPU_PrivCntl from the CSA.
1354          */
1355         out_be64(&priv2->spu_privcntl_RW, csa->priv2.spu_privcntl_RW);
1356         eieio();
1357 }
1358
1359 static inline void restore_status_part1(struct spu_state *csa, struct spu *spu)
1360 {
1361         struct spu_problem __iomem *prob = spu->problem;
1362         u32 mask;
1363
1364         /* Restore, Step 42:
1365          *     If any CSA.SPU_Status[I,S,H,P]=1, then
1366          *     restore the error or single step state.
1367          */
1368         mask = SPU_STATUS_INVALID_INSTR |
1369             SPU_STATUS_SINGLE_STEP |
1370             SPU_STATUS_STOPPED_BY_HALT | SPU_STATUS_STOPPED_BY_STOP;
1371         if (csa->prob.spu_status_R & mask) {
1372                 out_be32(&prob->spu_runcntl_RW, SPU_RUNCNTL_RUNNABLE);
1373                 eieio();
1374                 POLL_WHILE_TRUE(in_be32(&prob->spu_status_R) &
1375                                 SPU_STATUS_RUNNING);
1376         }
1377 }
1378
1379 static inline void restore_status_part2(struct spu_state *csa, struct spu *spu)
1380 {
1381         struct spu_problem __iomem *prob = spu->problem;
1382         u32 mask;
1383
1384         /* Restore, Step 43:
1385          *     If all CSA.SPU_Status[I,S,H,P,R]=0 then write
1386          *     SPU_RunCntl[R0R1]='01', wait for SPU_Status[R]=1,
1387          *     then write '00' to SPU_RunCntl[R0R1] and wait
1388          *     for SPU_Status[R]=0.
1389          */
1390         mask = SPU_STATUS_INVALID_INSTR |
1391             SPU_STATUS_SINGLE_STEP |
1392             SPU_STATUS_STOPPED_BY_HALT |
1393             SPU_STATUS_STOPPED_BY_STOP | SPU_STATUS_RUNNING;
1394         if (!(csa->prob.spu_status_R & mask)) {
1395                 out_be32(&prob->spu_runcntl_RW, SPU_RUNCNTL_RUNNABLE);
1396                 eieio();
1397                 POLL_WHILE_FALSE(in_be32(&prob->spu_status_R) &
1398                                  SPU_STATUS_RUNNING);
1399                 out_be32(&prob->spu_runcntl_RW, SPU_RUNCNTL_STOP);
1400                 eieio();
1401                 POLL_WHILE_TRUE(in_be32(&prob->spu_status_R) &
1402                                 SPU_STATUS_RUNNING);
1403         }
1404 }
1405
1406 static inline void restore_ls_16kb(struct spu_state *csa, struct spu *spu)
1407 {
1408         unsigned long addr = (unsigned long)&csa->lscsa->ls[0];
1409         unsigned int ls_offset = 0x0;
1410         unsigned int size = 16384;
1411         unsigned int tag = 0;
1412         unsigned int rclass = 0;
1413         unsigned int cmd = MFC_GET_CMD;
1414
1415         /* Restore, Step 44:
1416          *     Issue a DMA command to restore the first
1417          *     16kb of local storage from CSA.
1418          */
1419         send_mfc_dma(spu, addr, ls_offset, size, tag, rclass, cmd);
1420 }
1421
1422 static inline void clear_interrupts(struct spu_state *csa, struct spu *spu)
1423 {
1424         /* Restore, Step 49:
1425          *     Write INT_MASK_class0 with value of 0.
1426          *     Write INT_MASK_class1 with value of 0.
1427          *     Write INT_MASK_class2 with value of 0.
1428          *     Write INT_STAT_class0 with value of -1.
1429          *     Write INT_STAT_class1 with value of -1.
1430          *     Write INT_STAT_class2 with value of -1.
1431          */
1432         spin_lock_irq(&spu->register_lock);
1433         spu_int_mask_set(spu, 0, 0ul);
1434         spu_int_mask_set(spu, 1, 0ul);
1435         spu_int_mask_set(spu, 2, 0ul);
1436         spu_int_stat_clear(spu, 0, ~0ul);
1437         spu_int_stat_clear(spu, 1, ~0ul);
1438         spu_int_stat_clear(spu, 2, ~0ul);
1439         spin_unlock_irq(&spu->register_lock);
1440 }
1441
1442 static inline void restore_mfc_queues(struct spu_state *csa, struct spu *spu)
1443 {
1444         struct spu_priv2 __iomem *priv2 = spu->priv2;
1445         int i;
1446
1447         /* Restore, Step 50:
1448          *     If MFC_Cntl[Se]!=0 then restore
1449          *     MFC command queues.
1450          */
1451         if ((csa->priv2.mfc_control_RW & MFC_CNTL_DMA_QUEUES_EMPTY_MASK) == 0) {
1452                 for (i = 0; i < 8; i++) {
1453                         out_be64(&priv2->puq[i].mfc_cq_data0_RW,
1454                                  csa->priv2.puq[i].mfc_cq_data0_RW);
1455                         out_be64(&priv2->puq[i].mfc_cq_data1_RW,
1456                                  csa->priv2.puq[i].mfc_cq_data1_RW);
1457                         out_be64(&priv2->puq[i].mfc_cq_data2_RW,
1458                                  csa->priv2.puq[i].mfc_cq_data2_RW);
1459                         out_be64(&priv2->puq[i].mfc_cq_data3_RW,
1460                                  csa->priv2.puq[i].mfc_cq_data3_RW);
1461                 }
1462                 for (i = 0; i < 16; i++) {
1463                         out_be64(&priv2->spuq[i].mfc_cq_data0_RW,
1464                                  csa->priv2.spuq[i].mfc_cq_data0_RW);
1465                         out_be64(&priv2->spuq[i].mfc_cq_data1_RW,
1466                                  csa->priv2.spuq[i].mfc_cq_data1_RW);
1467                         out_be64(&priv2->spuq[i].mfc_cq_data2_RW,
1468                                  csa->priv2.spuq[i].mfc_cq_data2_RW);
1469                         out_be64(&priv2->spuq[i].mfc_cq_data3_RW,
1470                                  csa->priv2.spuq[i].mfc_cq_data3_RW);
1471                 }
1472         }
1473         eieio();
1474 }
1475
1476 static inline void restore_ppu_querymask(struct spu_state *csa, struct spu *spu)
1477 {
1478         struct spu_problem __iomem *prob = spu->problem;
1479
1480         /* Restore, Step 51:
1481          *     Restore the PPU_QueryMask register from CSA.
1482          */
1483         out_be32(&prob->dma_querymask_RW, csa->prob.dma_querymask_RW);
1484         eieio();
1485 }
1486
1487 static inline void restore_ppu_querytype(struct spu_state *csa, struct spu *spu)
1488 {
1489         struct spu_problem __iomem *prob = spu->problem;
1490
1491         /* Restore, Step 52:
1492          *     Restore the PPU_QueryType register from CSA.
1493          */
1494         out_be32(&prob->dma_querytype_RW, csa->prob.dma_querytype_RW);
1495         eieio();
1496 }
1497
1498 static inline void restore_mfc_csr_tsq(struct spu_state *csa, struct spu *spu)
1499 {
1500         struct spu_priv2 __iomem *priv2 = spu->priv2;
1501
1502         /* Restore, Step 53:
1503          *     Restore the MFC_CSR_TSQ register from CSA.
1504          */
1505         out_be64(&priv2->spu_tag_status_query_RW,
1506                  csa->priv2.spu_tag_status_query_RW);
1507         eieio();
1508 }
1509
1510 static inline void restore_mfc_csr_cmd(struct spu_state *csa, struct spu *spu)
1511 {
1512         struct spu_priv2 __iomem *priv2 = spu->priv2;
1513
1514         /* Restore, Step 54:
1515          *     Restore the MFC_CSR_CMD1 and MFC_CSR_CMD2
1516          *     registers from CSA.
1517          */
1518         out_be64(&priv2->spu_cmd_buf1_RW, csa->priv2.spu_cmd_buf1_RW);
1519         out_be64(&priv2->spu_cmd_buf2_RW, csa->priv2.spu_cmd_buf2_RW);
1520         eieio();
1521 }
1522
1523 static inline void restore_mfc_csr_ato(struct spu_state *csa, struct spu *spu)
1524 {
1525         struct spu_priv2 __iomem *priv2 = spu->priv2;
1526
1527         /* Restore, Step 55:
1528          *     Restore the MFC_CSR_ATO register from CSA.
1529          */
1530         out_be64(&priv2->spu_atomic_status_RW, csa->priv2.spu_atomic_status_RW);
1531 }
1532
1533 static inline void restore_mfc_tclass_id(struct spu_state *csa, struct spu *spu)
1534 {
1535         /* Restore, Step 56:
1536          *     Restore the MFC_TCLASS_ID register from CSA.
1537          */
1538         spu_mfc_tclass_id_set(spu, csa->priv1.mfc_tclass_id_RW);
1539         eieio();
1540 }
1541
1542 static inline void set_llr_event(struct spu_state *csa, struct spu *spu)
1543 {
1544         u64 ch0_cnt, ch0_data;
1545         u64 ch1_data;
1546
1547         /* Restore, Step 57:
1548          *    Set the Lock Line Reservation Lost Event by:
1549          *      1. OR CSA.SPU_Event_Status with bit 21 (Lr) set to 1.
1550          *      2. If CSA.SPU_Channel_0_Count=0 and
1551          *         CSA.SPU_Wr_Event_Mask[Lr]=1 and
1552          *         CSA.SPU_Event_Status[Lr]=0 then set
1553          *         CSA.SPU_Event_Status_Count=1.
1554          */
1555         ch0_cnt = csa->spu_chnlcnt_RW[0];
1556         ch0_data = csa->spu_chnldata_RW[0];
1557         ch1_data = csa->spu_chnldata_RW[1];
1558         csa->spu_chnldata_RW[0] |= MFC_LLR_LOST_EVENT;
1559         if ((ch0_cnt == 0) && !(ch0_data & MFC_LLR_LOST_EVENT) &&
1560             (ch1_data & MFC_LLR_LOST_EVENT)) {
1561                 csa->spu_chnlcnt_RW[0] = 1;
1562         }
1563 }
1564
1565 static inline void restore_decr_wrapped(struct spu_state *csa, struct spu *spu)
1566 {
1567         /* Restore, Step 58:
1568          *     If the status of the CSA software decrementer
1569          *     "wrapped" flag is set, OR in a '1' to
1570          *     CSA.SPU_Event_Status[Tm].
1571          */
1572         if (csa->lscsa->decr_status.slot[0] == 1) {
1573                 csa->spu_chnldata_RW[0] |= 0x20;
1574         }
1575         if ((csa->lscsa->decr_status.slot[0] == 1) &&
1576             (csa->spu_chnlcnt_RW[0] == 0 &&
1577              ((csa->spu_chnldata_RW[2] & 0x20) == 0x0) &&
1578              ((csa->spu_chnldata_RW[0] & 0x20) != 0x1))) {
1579                 csa->spu_chnlcnt_RW[0] = 1;
1580         }
1581 }
1582
1583 static inline void restore_ch_part1(struct spu_state *csa, struct spu *spu)
1584 {
1585         struct spu_priv2 __iomem *priv2 = spu->priv2;
1586         u64 idx, ch_indices[7] = { 0UL, 3UL, 4UL, 24UL, 25UL, 27UL };
1587         int i;
1588
1589         /* Restore, Step 59:
1590          */
1591
1592         /* Restore CH 1 without count */
1593         out_be64(&priv2->spu_chnlcntptr_RW, 1);
1594         out_be64(&priv2->spu_chnldata_RW, csa->spu_chnldata_RW[1]);
1595
1596         /* Restore the following CH: [0,3,4,24,25,27] */
1597         for (i = 0; i < 7; i++) {
1598                 idx = ch_indices[i];
1599                 out_be64(&priv2->spu_chnlcntptr_RW, idx);
1600                 eieio();
1601                 out_be64(&priv2->spu_chnldata_RW, csa->spu_chnldata_RW[idx]);
1602                 out_be64(&priv2->spu_chnlcnt_RW, csa->spu_chnlcnt_RW[idx]);
1603                 eieio();
1604         }
1605 }
1606
1607 static inline void restore_ch_part2(struct spu_state *csa, struct spu *spu)
1608 {
1609         struct spu_priv2 __iomem *priv2 = spu->priv2;
1610         u64 ch_indices[3] = { 9UL, 21UL, 23UL };
1611         u64 ch_counts[3] = { 1UL, 16UL, 1UL };
1612         u64 idx;
1613         int i;
1614
1615         /* Restore, Step 60:
1616          *     Restore the following CH: [9,21,23].
1617          */
1618         ch_counts[0] = 1UL;
1619         ch_counts[1] = csa->spu_chnlcnt_RW[21];
1620         ch_counts[2] = 1UL;
1621         for (i = 0; i < 3; i++) {
1622                 idx = ch_indices[i];
1623                 out_be64(&priv2->spu_chnlcntptr_RW, idx);
1624                 eieio();
1625                 out_be64(&priv2->spu_chnlcnt_RW, ch_counts[i]);
1626                 eieio();
1627         }
1628 }
1629
1630 static inline void restore_spu_lslr(struct spu_state *csa, struct spu *spu)
1631 {
1632         struct spu_priv2 __iomem *priv2 = spu->priv2;
1633
1634         /* Restore, Step 61:
1635          *     Restore the SPU_LSLR register from CSA.
1636          */
1637         out_be64(&priv2->spu_lslr_RW, csa->priv2.spu_lslr_RW);
1638         eieio();
1639 }
1640
1641 static inline void restore_spu_cfg(struct spu_state *csa, struct spu *spu)
1642 {
1643         struct spu_priv2 __iomem *priv2 = spu->priv2;
1644
1645         /* Restore, Step 62:
1646          *     Restore the SPU_Cfg register from CSA.
1647          */
1648         out_be64(&priv2->spu_cfg_RW, csa->priv2.spu_cfg_RW);
1649         eieio();
1650 }
1651
1652 static inline void restore_pm_trace(struct spu_state *csa, struct spu *spu)
1653 {
1654         /* Restore, Step 63:
1655          *     Restore PM_Trace_Tag_Wait_Mask from CSA.
1656          *     Not performed by this implementation.
1657          */
1658 }
1659
1660 static inline void restore_spu_npc(struct spu_state *csa, struct spu *spu)
1661 {
1662         struct spu_problem __iomem *prob = spu->problem;
1663
1664         /* Restore, Step 64:
1665          *     Restore SPU_NPC from CSA.
1666          */
1667         out_be32(&prob->spu_npc_RW, csa->prob.spu_npc_RW);
1668         eieio();
1669 }
1670
1671 static inline void restore_spu_mb(struct spu_state *csa, struct spu *spu)
1672 {
1673         struct spu_priv2 __iomem *priv2 = spu->priv2;
1674         int i;
1675
1676         /* Restore, Step 65:
1677          *     Restore MFC_RdSPU_MB from CSA.
1678          */
1679         out_be64(&priv2->spu_chnlcntptr_RW, 29UL);
1680         eieio();
1681         out_be64(&priv2->spu_chnlcnt_RW, csa->spu_chnlcnt_RW[29]);
1682         for (i = 0; i < 4; i++) {
1683                 out_be64(&priv2->spu_chnldata_RW, csa->spu_mailbox_data[i]);
1684         }
1685         eieio();
1686 }
1687
1688 static inline void check_ppu_mb_stat(struct spu_state *csa, struct spu *spu)
1689 {
1690         struct spu_problem __iomem *prob = spu->problem;
1691         u32 dummy = 0;
1692
1693         /* Restore, Step 66:
1694          *     If CSA.MB_Stat[P]=0 (mailbox empty) then
1695          *     read from the PPU_MB register.
1696          */
1697         if ((csa->prob.mb_stat_R & 0xFF) == 0) {
1698                 dummy = in_be32(&prob->pu_mb_R);
1699                 eieio();
1700         }
1701 }
1702
1703 static inline void check_ppuint_mb_stat(struct spu_state *csa, struct spu *spu)
1704 {
1705         struct spu_priv2 __iomem *priv2 = spu->priv2;
1706         u64 dummy = 0UL;
1707
1708         /* Restore, Step 66:
1709          *     If CSA.MB_Stat[I]=0 (mailbox empty) then
1710          *     read from the PPUINT_MB register.
1711          */
1712         if ((csa->prob.mb_stat_R & 0xFF0000) == 0) {
1713                 dummy = in_be64(&priv2->puint_mb_R);
1714                 eieio();
1715                 spu_int_stat_clear(spu, 2, CLASS2_ENABLE_MAILBOX_INTR);
1716                 eieio();
1717         }
1718 }
1719
1720 static inline void restore_mfc_slbs(struct spu_state *csa, struct spu *spu)
1721 {
1722         struct spu_priv2 __iomem *priv2 = spu->priv2;
1723         int i;
1724
1725         /* Restore, Step 68:
1726          *     If MFC_SR1[R]='1', restore SLBs from CSA.
1727          */
1728         if (csa->priv1.mfc_sr1_RW & MFC_STATE1_RELOCATE_MASK) {
1729                 for (i = 0; i < 8; i++) {
1730                         out_be64(&priv2->slb_index_W, i);
1731                         eieio();
1732                         out_be64(&priv2->slb_esid_RW, csa->slb_esid_RW[i]);
1733                         out_be64(&priv2->slb_vsid_RW, csa->slb_vsid_RW[i]);
1734                         eieio();
1735                 }
1736                 out_be64(&priv2->slb_index_W, csa->priv2.slb_index_W);
1737                 eieio();
1738         }
1739 }
1740
1741 static inline void restore_mfc_sr1(struct spu_state *csa, struct spu *spu)
1742 {
1743         /* Restore, Step 69:
1744          *     Restore the MFC_SR1 register from CSA.
1745          */
1746         spu_mfc_sr1_set(spu, csa->priv1.mfc_sr1_RW);
1747         eieio();
1748 }
1749
1750 static inline void restore_other_spu_access(struct spu_state *csa,
1751                                             struct spu *spu)
1752 {
1753         /* Restore, Step 70:
1754          *     Restore other SPU mappings to this SPU. TBD.
1755          */
1756 }
1757
1758 static inline void restore_spu_runcntl(struct spu_state *csa, struct spu *spu)
1759 {
1760         struct spu_problem __iomem *prob = spu->problem;
1761
1762         /* Restore, Step 71:
1763          *     If CSA.SPU_Status[R]=1 then write
1764          *     SPU_RunCntl[R0R1]='01'.
1765          */
1766         if (csa->prob.spu_status_R & SPU_STATUS_RUNNING) {
1767                 out_be32(&prob->spu_runcntl_RW, SPU_RUNCNTL_RUNNABLE);
1768                 eieio();
1769         }
1770 }
1771
1772 static inline void restore_mfc_cntl(struct spu_state *csa, struct spu *spu)
1773 {
1774         struct spu_priv2 __iomem *priv2 = spu->priv2;
1775
1776         /* Restore, Step 72:
1777          *    Restore the MFC_CNTL register for the CSA.
1778          */
1779         out_be64(&priv2->mfc_control_RW, csa->priv2.mfc_control_RW);
1780         eieio();
1781 }
1782
1783 static inline void enable_user_access(struct spu_state *csa, struct spu *spu)
1784 {
1785         /* Restore, Step 73:
1786          *     Enable user-space access (if provided) to this
1787          *     SPU by mapping the virtual pages assigned to
1788          *     the SPU memory-mapped I/O (MMIO) for problem
1789          *     state. TBD.
1790          */
1791 }
1792
1793 static inline void reset_switch_active(struct spu_state *csa, struct spu *spu)
1794 {
1795         /* Restore, Step 74:
1796          *     Reset the "context switch active" flag.
1797          */
1798         clear_bit(SPU_CONTEXT_SWITCH_ACTIVE, &spu->flags);
1799         mb();
1800 }
1801
1802 static inline void reenable_interrupts(struct spu_state *csa, struct spu *spu)
1803 {
1804         /* Restore, Step 75:
1805          *     Re-enable SPU interrupts.
1806          */
1807         spin_lock_irq(&spu->register_lock);
1808         spu_int_mask_set(spu, 0, csa->priv1.int_mask_class0_RW);
1809         spu_int_mask_set(spu, 1, csa->priv1.int_mask_class1_RW);
1810         spu_int_mask_set(spu, 2, csa->priv1.int_mask_class2_RW);
1811         spin_unlock_irq(&spu->register_lock);
1812 }
1813
1814 static int quiece_spu(struct spu_state *prev, struct spu *spu)
1815 {
1816         /*
1817          * Combined steps 2-18 of SPU context save sequence, which
1818          * quiesce the SPU state (disable SPU execution, MFC command
1819          * queues, decrementer, SPU interrupts, etc.).
1820          *
1821          * Returns      0 on success.
1822          *              2 if failed step 2.
1823          *              6 if failed step 6.
1824          */
1825
1826         if (check_spu_isolate(prev, spu)) {     /* Step 2. */
1827                 return 2;
1828         }
1829         disable_interrupts(prev, spu);          /* Step 3. */
1830         set_watchdog_timer(prev, spu);          /* Step 4. */
1831         inhibit_user_access(prev, spu);         /* Step 5. */
1832         if (check_spu_isolate(prev, spu)) {     /* Step 6. */
1833                 return 6;
1834         }
1835         set_switch_pending(prev, spu);          /* Step 7. */
1836         save_mfc_cntl(prev, spu);               /* Step 8. */
1837         save_spu_runcntl(prev, spu);            /* Step 9. */
1838         save_mfc_sr1(prev, spu);                /* Step 10. */
1839         save_spu_status(prev, spu);             /* Step 11. */
1840         save_mfc_decr(prev, spu);               /* Step 12. */
1841         halt_mfc_decr(prev, spu);               /* Step 13. */
1842         save_timebase(prev, spu);               /* Step 14. */
1843         remove_other_spu_access(prev, spu);     /* Step 15. */
1844         do_mfc_mssync(prev, spu);               /* Step 16. */
1845         issue_mfc_tlbie(prev, spu);             /* Step 17. */
1846         handle_pending_interrupts(prev, spu);   /* Step 18. */
1847
1848         return 0;
1849 }
1850
1851 static void save_csa(struct spu_state *prev, struct spu *spu)
1852 {
1853         /*
1854          * Combine steps 19-44 of SPU context save sequence, which
1855          * save regions of the privileged & problem state areas.
1856          */
1857
1858         save_mfc_queues(prev, spu);     /* Step 19. */
1859         save_ppu_querymask(prev, spu);  /* Step 20. */
1860         save_ppu_querytype(prev, spu);  /* Step 21. */
1861         save_mfc_csr_tsq(prev, spu);    /* Step 22. */
1862         save_mfc_csr_cmd(prev, spu);    /* Step 23. */
1863         save_mfc_csr_ato(prev, spu);    /* Step 24. */
1864         save_mfc_tclass_id(prev, spu);  /* Step 25. */
1865         set_mfc_tclass_id(prev, spu);   /* Step 26. */
1866         purge_mfc_queue(prev, spu);     /* Step 27. */
1867         wait_purge_complete(prev, spu); /* Step 28. */
1868         save_mfc_slbs(prev, spu);       /* Step 29. */
1869         setup_mfc_sr1(prev, spu);       /* Step 30. */
1870         save_spu_npc(prev, spu);        /* Step 31. */
1871         save_spu_privcntl(prev, spu);   /* Step 32. */
1872         reset_spu_privcntl(prev, spu);  /* Step 33. */
1873         save_spu_lslr(prev, spu);       /* Step 34. */
1874         reset_spu_lslr(prev, spu);      /* Step 35. */
1875         save_spu_cfg(prev, spu);        /* Step 36. */
1876         save_pm_trace(prev, spu);       /* Step 37. */
1877         save_mfc_rag(prev, spu);        /* Step 38. */
1878         save_ppu_mb_stat(prev, spu);    /* Step 39. */
1879         save_ppu_mb(prev, spu);         /* Step 40. */
1880         save_ppuint_mb(prev, spu);      /* Step 41. */
1881         save_ch_part1(prev, spu);       /* Step 42. */
1882         save_spu_mb(prev, spu);         /* Step 43. */
1883         save_mfc_cmd(prev, spu);        /* Step 44. */
1884         reset_ch(prev, spu);            /* Step 45. */
1885 }
1886
1887 static void save_lscsa(struct spu_state *prev, struct spu *spu)
1888 {
1889         /*
1890          * Perform steps 46-57 of SPU context save sequence,
1891          * which save regions of the local store and register
1892          * file.
1893          */
1894
1895         resume_mfc_queue(prev, spu);    /* Step 46. */
1896         setup_mfc_slbs(prev, spu);      /* Step 47. */
1897         set_switch_active(prev, spu);   /* Step 48. */
1898         enable_interrupts(prev, spu);   /* Step 49. */
1899         save_ls_16kb(prev, spu);        /* Step 50. */
1900         set_spu_npc(prev, spu);         /* Step 51. */
1901         set_signot1(prev, spu);         /* Step 52. */
1902         set_signot2(prev, spu);         /* Step 53. */
1903         send_save_code(prev, spu);      /* Step 54. */
1904         set_ppu_querymask(prev, spu);   /* Step 55. */
1905         wait_tag_complete(prev, spu);   /* Step 56. */
1906         wait_spu_stopped(prev, spu);    /* Step 57. */
1907 }
1908
1909 static void harvest(struct spu_state *prev, struct spu *spu)
1910 {
1911         /*
1912          * Perform steps 2-25 of SPU context restore sequence,
1913          * which resets an SPU either after a failed save, or
1914          * when using SPU for first time.
1915          */
1916
1917         disable_interrupts(prev, spu);          /* Step 2.  */
1918         inhibit_user_access(prev, spu);         /* Step 3.  */
1919         terminate_spu_app(prev, spu);           /* Step 4.  */
1920         set_switch_pending(prev, spu);          /* Step 5.  */
1921         remove_other_spu_access(prev, spu);     /* Step 6.  */
1922         suspend_mfc(prev, spu);                 /* Step 7.  */
1923         wait_suspend_mfc_complete(prev, spu);   /* Step 8.  */
1924         if (!suspend_spe(prev, spu))            /* Step 9.  */
1925                 clear_spu_status(prev, spu);    /* Step 10. */
1926         do_mfc_mssync(prev, spu);               /* Step 11. */
1927         issue_mfc_tlbie(prev, spu);             /* Step 12. */
1928         handle_pending_interrupts(prev, spu);   /* Step 13. */
1929         purge_mfc_queue(prev, spu);             /* Step 14. */
1930         wait_purge_complete(prev, spu);         /* Step 15. */
1931         reset_spu_privcntl(prev, spu);          /* Step 16. */
1932         reset_spu_lslr(prev, spu);              /* Step 17. */
1933         setup_mfc_sr1(prev, spu);               /* Step 18. */
1934         invalidate_slbs(prev, spu);             /* Step 19. */
1935         reset_ch_part1(prev, spu);              /* Step 20. */
1936         reset_ch_part2(prev, spu);              /* Step 21. */
1937         enable_interrupts(prev, spu);           /* Step 22. */
1938         set_switch_active(prev, spu);           /* Step 23. */
1939         set_mfc_tclass_id(prev, spu);           /* Step 24. */
1940         resume_mfc_queue(prev, spu);            /* Step 25. */
1941 }
1942
1943 static void restore_lscsa(struct spu_state *next, struct spu *spu)
1944 {
1945         /*
1946          * Perform steps 26-40 of SPU context restore sequence,
1947          * which restores regions of the local store and register
1948          * file.
1949          */
1950
1951         set_watchdog_timer(next, spu);          /* Step 26. */
1952         setup_spu_status_part1(next, spu);      /* Step 27. */
1953         setup_spu_status_part2(next, spu);      /* Step 28. */
1954         restore_mfc_rag(next, spu);             /* Step 29. */
1955         setup_mfc_slbs(next, spu);              /* Step 30. */
1956         set_spu_npc(next, spu);                 /* Step 31. */
1957         set_signot1(next, spu);                 /* Step 32. */
1958         set_signot2(next, spu);                 /* Step 33. */
1959         setup_decr(next, spu);                  /* Step 34. */
1960         setup_ppu_mb(next, spu);                /* Step 35. */
1961         setup_ppuint_mb(next, spu);             /* Step 36. */
1962         send_restore_code(next, spu);           /* Step 37. */
1963         set_ppu_querymask(next, spu);           /* Step 38. */
1964         wait_tag_complete(next, spu);           /* Step 39. */
1965         wait_spu_stopped(next, spu);            /* Step 40. */
1966 }
1967
1968 static void restore_csa(struct spu_state *next, struct spu *spu)
1969 {
1970         /*
1971          * Combine steps 41-76 of SPU context restore sequence, which
1972          * restore regions of the privileged & problem state areas.
1973          */
1974
1975         restore_spu_privcntl(next, spu);        /* Step 41. */
1976         restore_status_part1(next, spu);        /* Step 42. */
1977         restore_status_part2(next, spu);        /* Step 43. */
1978         restore_ls_16kb(next, spu);             /* Step 44. */
1979         wait_tag_complete(next, spu);           /* Step 45. */
1980         suspend_mfc(next, spu);                 /* Step 46. */
1981         wait_suspend_mfc_complete(next, spu);   /* Step 47. */
1982         issue_mfc_tlbie(next, spu);             /* Step 48. */
1983         clear_interrupts(next, spu);            /* Step 49. */
1984         restore_mfc_queues(next, spu);          /* Step 50. */
1985         restore_ppu_querymask(next, spu);       /* Step 51. */
1986         restore_ppu_querytype(next, spu);       /* Step 52. */
1987         restore_mfc_csr_tsq(next, spu);         /* Step 53. */
1988         restore_mfc_csr_cmd(next, spu);         /* Step 54. */
1989         restore_mfc_csr_ato(next, spu);         /* Step 55. */
1990         restore_mfc_tclass_id(next, spu);       /* Step 56. */
1991         set_llr_event(next, spu);               /* Step 57. */
1992         restore_decr_wrapped(next, spu);        /* Step 58. */
1993         restore_ch_part1(next, spu);            /* Step 59. */
1994         restore_ch_part2(next, spu);            /* Step 60. */
1995         restore_spu_lslr(next, spu);            /* Step 61. */
1996         restore_spu_cfg(next, spu);             /* Step 62. */
1997         restore_pm_trace(next, spu);            /* Step 63. */
1998         restore_spu_npc(next, spu);             /* Step 64. */
1999         restore_spu_mb(next, spu);              /* Step 65. */
2000         check_ppu_mb_stat(next, spu);           /* Step 66. */
2001         check_ppuint_mb_stat(next, spu);        /* Step 67. */
2002         restore_mfc_slbs(next, spu);            /* Step 68. */
2003         restore_mfc_sr1(next, spu);             /* Step 69. */
2004         restore_other_spu_access(next, spu);    /* Step 70. */
2005         restore_spu_runcntl(next, spu);         /* Step 71. */
2006         restore_mfc_cntl(next, spu);            /* Step 72. */
2007         enable_user_access(next, spu);          /* Step 73. */
2008         reset_switch_active(next, spu);         /* Step 74. */
2009         reenable_interrupts(next, spu);         /* Step 75. */
2010 }
2011
2012 static int __do_spu_save(struct spu_state *prev, struct spu *spu)
2013 {
2014         int rc;
2015
2016         /*
2017          * SPU context save can be broken into three phases:
2018          *
2019          *     (a) quiesce [steps 2-16].
2020          *     (b) save of CSA, performed by PPE [steps 17-42]
2021          *     (c) save of LSCSA, mostly performed by SPU [steps 43-52].
2022          *
2023          * Returns      0 on success.
2024          *              2,6 if failed to quiece SPU
2025          *              53 if SPU-side of save failed.
2026          */
2027
2028         rc = quiece_spu(prev, spu);             /* Steps 2-16. */
2029         switch (rc) {
2030         default:
2031         case 2:
2032         case 6:
2033                 harvest(prev, spu);
2034                 return rc;
2035                 break;
2036         case 0:
2037                 break;
2038         }
2039         save_csa(prev, spu);                    /* Steps 17-43. */
2040         save_lscsa(prev, spu);                  /* Steps 44-53. */
2041         return check_save_status(prev, spu);    /* Step 54.     */
2042 }
2043
2044 static int __do_spu_restore(struct spu_state *next, struct spu *spu)
2045 {
2046         int rc;
2047
2048         /*
2049          * SPU context restore can be broken into three phases:
2050          *
2051          *    (a) harvest (or reset) SPU [steps 2-24].
2052          *    (b) restore LSCSA [steps 25-40], mostly performed by SPU.
2053          *    (c) restore CSA [steps 41-76], performed by PPE.
2054          *
2055          * The 'harvest' step is not performed here, but rather
2056          * as needed below.
2057          */
2058
2059         restore_lscsa(next, spu);               /* Steps 24-39. */
2060         rc = check_restore_status(next, spu);   /* Step 40.     */
2061         switch (rc) {
2062         default:
2063                 /* Failed. Return now. */
2064                 return rc;
2065                 break;
2066         case 0:
2067                 /* Fall through to next step. */
2068                 break;
2069         }
2070         restore_csa(next, spu);
2071
2072         return 0;
2073 }
2074
2075 /**
2076  * spu_save - SPU context save, with locking.
2077  * @prev: pointer to SPU context save area, to be saved.
2078  * @spu: pointer to SPU iomem structure.
2079  *
2080  * Acquire locks, perform the save operation then return.
2081  */
2082 int spu_save(struct spu_state *prev, struct spu *spu)
2083 {
2084         int rc;
2085
2086         acquire_spu_lock(spu);          /* Step 1.     */
2087         rc = __do_spu_save(prev, spu);  /* Steps 2-53. */
2088         release_spu_lock(spu);
2089         if (rc) {
2090                 panic("%s failed on SPU[%d], rc=%d.\n",
2091                       __func__, spu->number, rc);
2092         }
2093         return rc;
2094 }
2095 EXPORT_SYMBOL_GPL(spu_save);
2096
2097 /**
2098  * spu_restore - SPU context restore, with harvest and locking.
2099  * @new: pointer to SPU context save area, to be restored.
2100  * @spu: pointer to SPU iomem structure.
2101  *
2102  * Perform harvest + restore, as we may not be coming
2103  * from a previous successful save operation, and the
2104  * hardware state is unknown.
2105  */
2106 int spu_restore(struct spu_state *new, struct spu *spu)
2107 {
2108         int rc;
2109
2110         acquire_spu_lock(spu);
2111         harvest(NULL, spu);
2112         spu->dar = 0;
2113         spu->dsisr = 0;
2114         spu->slb_replace = 0;
2115         spu->class_0_pending = 0;
2116         rc = __do_spu_restore(new, spu);
2117         release_spu_lock(spu);
2118         if (rc) {
2119                 panic("%s failed on SPU[%d] rc=%d.\n",
2120                        __func__, spu->number, rc);
2121         }
2122         return rc;
2123 }
2124 EXPORT_SYMBOL_GPL(spu_restore);
2125
2126 /**
2127  * spu_harvest - SPU harvest (reset) operation
2128  * @spu: pointer to SPU iomem structure.
2129  *
2130  * Perform SPU harvest (reset) operation.
2131  */
2132 void spu_harvest(struct spu *spu)
2133 {
2134         acquire_spu_lock(spu);
2135         harvest(NULL, spu);
2136         release_spu_lock(spu);
2137 }
2138
2139 static void init_prob(struct spu_state *csa)
2140 {
2141         csa->spu_chnlcnt_RW[9] = 1;
2142         csa->spu_chnlcnt_RW[21] = 16;
2143         csa->spu_chnlcnt_RW[23] = 1;
2144         csa->spu_chnlcnt_RW[28] = 1;
2145         csa->spu_chnlcnt_RW[30] = 1;
2146         csa->prob.spu_runcntl_RW = SPU_RUNCNTL_STOP;
2147         csa->prob.mb_stat_R = 0x000400;
2148 }
2149
2150 static void init_priv1(struct spu_state *csa)
2151 {
2152         /* Enable decode, relocate, tlbie response, master runcntl. */
2153         csa->priv1.mfc_sr1_RW = MFC_STATE1_LOCAL_STORAGE_DECODE_MASK |
2154             MFC_STATE1_MASTER_RUN_CONTROL_MASK |
2155             MFC_STATE1_PROBLEM_STATE_MASK |
2156             MFC_STATE1_RELOCATE_MASK | MFC_STATE1_BUS_TLBIE_MASK;
2157
2158         /* Set storage description.  */
2159         csa->priv1.mfc_sdr_RW = mfspr(SPRN_SDR1);
2160
2161         /* Enable OS-specific set of interrupts. */
2162         csa->priv1.int_mask_class0_RW = CLASS0_ENABLE_DMA_ALIGNMENT_INTR |
2163             CLASS0_ENABLE_INVALID_DMA_COMMAND_INTR |
2164             CLASS0_ENABLE_SPU_ERROR_INTR;
2165         csa->priv1.int_mask_class1_RW = CLASS1_ENABLE_SEGMENT_FAULT_INTR |
2166             CLASS1_ENABLE_STORAGE_FAULT_INTR;
2167         csa->priv1.int_mask_class2_RW = CLASS2_ENABLE_SPU_STOP_INTR |
2168             CLASS2_ENABLE_SPU_HALT_INTR |
2169             CLASS2_ENABLE_SPU_DMA_TAG_GROUP_COMPLETE_INTR;
2170 }
2171
2172 static void init_priv2(struct spu_state *csa)
2173 {
2174         csa->priv2.spu_lslr_RW = LS_ADDR_MASK;
2175         csa->priv2.mfc_control_RW = MFC_CNTL_RESUME_DMA_QUEUE |
2176             MFC_CNTL_NORMAL_DMA_QUEUE_OPERATION |
2177             MFC_CNTL_DMA_QUEUES_EMPTY_MASK;
2178 }
2179
2180 /**
2181  * spu_alloc_csa - allocate and initialize an SPU context save area.
2182  *
2183  * Allocate and initialize the contents of an SPU context save area.
2184  * This includes enabling address translation, interrupt masks, etc.,
2185  * as appropriate for the given OS environment.
2186  *
2187  * Note that storage for the 'lscsa' is allocated separately,
2188  * as it is by far the largest of the context save regions,
2189  * and may need to be pinned or otherwise specially aligned.
2190  */
2191 void spu_init_csa(struct spu_state *csa)
2192 {
2193         struct spu_lscsa *lscsa;
2194         unsigned char *p;
2195
2196         if (!csa)
2197                 return;
2198         memset(csa, 0, sizeof(struct spu_state));
2199
2200         lscsa = vmalloc(sizeof(struct spu_lscsa));
2201         if (!lscsa)
2202                 return;
2203
2204         memset(lscsa, 0, sizeof(struct spu_lscsa));
2205         csa->lscsa = lscsa;
2206         csa->register_lock = SPIN_LOCK_UNLOCKED;
2207
2208         /* Set LS pages reserved to allow for user-space mapping. */
2209         for (p = lscsa->ls; p < lscsa->ls + LS_SIZE; p += PAGE_SIZE)
2210                 SetPageReserved(vmalloc_to_page(p));
2211
2212         init_prob(csa);
2213         init_priv1(csa);
2214         init_priv2(csa);
2215 }
2216 EXPORT_SYMBOL_GPL(spu_init_csa);
2217
2218 void spu_fini_csa(struct spu_state *csa)
2219 {
2220         /* Clear reserved bit before vfree. */
2221         unsigned char *p;
2222         for (p = csa->lscsa->ls; p < csa->lscsa->ls + LS_SIZE; p += PAGE_SIZE)
2223                 ClearPageReserved(vmalloc_to_page(p));
2224
2225         vfree(csa->lscsa);
2226 }
2227 EXPORT_SYMBOL_GPL(spu_fini_csa);