linux/arch/powerpc/platforms/cell/spu_base.c
<<
>>
Prefs
   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Low-level SPU handling
   4 *
   5 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
   6 *
   7 * Author: Arnd Bergmann <arndb@de.ibm.com>
   8 */
   9
  10#undef DEBUG
  11
  12#include <linux/interrupt.h>
  13#include <linux/list.h>
  14#include <linux/init.h>
  15#include <linux/ptrace.h>
  16#include <linux/slab.h>
  17#include <linux/wait.h>
  18#include <linux/mm.h>
  19#include <linux/io.h>
  20#include <linux/mutex.h>
  21#include <linux/linux_logo.h>
  22#include <linux/syscore_ops.h>
  23#include <asm/spu.h>
  24#include <asm/spu_priv1.h>
  25#include <asm/spu_csa.h>
  26#include <asm/xmon.h>
  27#include <asm/prom.h>
  28#include <asm/kexec.h>
  29
  30const struct spu_management_ops *spu_management_ops;
  31EXPORT_SYMBOL_GPL(spu_management_ops);
  32
  33const struct spu_priv1_ops *spu_priv1_ops;
  34EXPORT_SYMBOL_GPL(spu_priv1_ops);
  35
  36struct cbe_spu_info cbe_spu_info[MAX_NUMNODES];
  37EXPORT_SYMBOL_GPL(cbe_spu_info);
  38
  39/*
  40 * The spufs fault-handling code needs to call force_sig_fault to raise signals
  41 * on DMA errors. Export it here to avoid general kernel-wide access to this
  42 * function
  43 */
  44EXPORT_SYMBOL_GPL(force_sig_fault);
  45
  46/*
  47 * Protects cbe_spu_info and spu->number.
  48 */
  49static DEFINE_SPINLOCK(spu_lock);
  50
  51/*
  52 * List of all spus in the system.
  53 *
  54 * This list is iterated by callers from irq context and callers that
  55 * want to sleep.  Thus modifications need to be done with both
  56 * spu_full_list_lock and spu_full_list_mutex held, while iterating
  57 * through it requires either of these locks.
  58 *
  59 * In addition spu_full_list_lock protects all assignments to
  60 * spu->mm.
  61 */
  62static LIST_HEAD(spu_full_list);
  63static DEFINE_SPINLOCK(spu_full_list_lock);
  64static DEFINE_MUTEX(spu_full_list_mutex);
  65
  66void spu_invalidate_slbs(struct spu *spu)
  67{
  68        struct spu_priv2 __iomem *priv2 = spu->priv2;
  69        unsigned long flags;
  70
  71        spin_lock_irqsave(&spu->register_lock, flags);
  72        if (spu_mfc_sr1_get(spu) & MFC_STATE1_RELOCATE_MASK)
  73                out_be64(&priv2->slb_invalidate_all_W, 0UL);
  74        spin_unlock_irqrestore(&spu->register_lock, flags);
  75}
  76EXPORT_SYMBOL_GPL(spu_invalidate_slbs);
  77
  78/* This is called by the MM core when a segment size is changed, to
  79 * request a flush of all the SPEs using a given mm
  80 */
  81void spu_flush_all_slbs(struct mm_struct *mm)
  82{
  83        struct spu *spu;
  84        unsigned long flags;
  85
  86        spin_lock_irqsave(&spu_full_list_lock, flags);
  87        list_for_each_entry(spu, &spu_full_list, full_list) {
  88                if (spu->mm == mm)
  89                        spu_invalidate_slbs(spu);
  90        }
  91        spin_unlock_irqrestore(&spu_full_list_lock, flags);
  92}
  93
  94/* The hack below stinks... try to do something better one of
  95 * these days... Does it even work properly with NR_CPUS == 1 ?
  96 */
  97static inline void mm_needs_global_tlbie(struct mm_struct *mm)
  98{
  99        int nr = (NR_CPUS > 1) ? NR_CPUS : NR_CPUS + 1;
 100
 101        /* Global TLBIE broadcast required with SPEs. */
 102        bitmap_fill(cpumask_bits(mm_cpumask(mm)), nr);
 103}
 104
 105void spu_associate_mm(struct spu *spu, struct mm_struct *mm)
 106{
 107        unsigned long flags;
 108
 109        spin_lock_irqsave(&spu_full_list_lock, flags);
 110        spu->mm = mm;
 111        spin_unlock_irqrestore(&spu_full_list_lock, flags);
 112        if (mm)
 113                mm_needs_global_tlbie(mm);
 114}
 115EXPORT_SYMBOL_GPL(spu_associate_mm);
 116
 117int spu_64k_pages_available(void)
 118{
 119        return mmu_psize_defs[MMU_PAGE_64K].shift != 0;
 120}
 121EXPORT_SYMBOL_GPL(spu_64k_pages_available);
 122
 123static void spu_restart_dma(struct spu *spu)
 124{
 125        struct spu_priv2 __iomem *priv2 = spu->priv2;
 126
 127        if (!test_bit(SPU_CONTEXT_SWITCH_PENDING, &spu->flags))
 128                out_be64(&priv2->mfc_control_RW, MFC_CNTL_RESTART_DMA_COMMAND);
 129        else {
 130                set_bit(SPU_CONTEXT_FAULT_PENDING, &spu->flags);
 131                mb();
 132        }
 133}
 134
 135static inline void spu_load_slb(struct spu *spu, int slbe, struct copro_slb *slb)
 136{
 137        struct spu_priv2 __iomem *priv2 = spu->priv2;
 138
 139        pr_debug("%s: adding SLB[%d] 0x%016llx 0x%016llx\n",
 140                        __func__, slbe, slb->vsid, slb->esid);
 141
 142        out_be64(&priv2->slb_index_W, slbe);
 143        /* set invalid before writing vsid */
 144        out_be64(&priv2->slb_esid_RW, 0);
 145        /* now it's safe to write the vsid */
 146        out_be64(&priv2->slb_vsid_RW, slb->vsid);
 147        /* setting the new esid makes the entry valid again */
 148        out_be64(&priv2->slb_esid_RW, slb->esid);
 149}
 150
 151static int __spu_trap_data_seg(struct spu *spu, unsigned long ea)
 152{
 153        struct copro_slb slb;
 154        int ret;
 155
 156        ret = copro_calculate_slb(spu->mm, ea, &slb);
 157        if (ret)
 158                return ret;
 159
 160        spu_load_slb(spu, spu->slb_replace, &slb);
 161
 162        spu->slb_replace++;
 163        if (spu->slb_replace >= 8)
 164                spu->slb_replace = 0;
 165
 166        spu_restart_dma(spu);
 167        spu->stats.slb_flt++;
 168        return 0;
 169}
 170
 171extern int hash_page(unsigned long ea, unsigned long access,
 172                     unsigned long trap, unsigned long dsisr); //XXX
 173static int __spu_trap_data_map(struct spu *spu, unsigned long ea, u64 dsisr)
 174{
 175        int ret;
 176
 177        pr_debug("%s, %llx, %lx\n", __func__, dsisr, ea);
 178
 179        /*
 180         * Handle kernel space hash faults immediately. User hash
 181         * faults need to be deferred to process context.
 182         */
 183        if ((dsisr & MFC_DSISR_PTE_NOT_FOUND) &&
 184            (get_region_id(ea) != USER_REGION_ID)) {
 185
 186                spin_unlock(&spu->register_lock);
 187                ret = hash_page(ea,
 188                                _PAGE_PRESENT | _PAGE_READ | _PAGE_PRIVILEGED,
 189                                0x300, dsisr);
 190                spin_lock(&spu->register_lock);
 191
 192                if (!ret) {
 193                        spu_restart_dma(spu);
 194                        return 0;
 195                }
 196        }
 197
 198        spu->class_1_dar = ea;
 199        spu->class_1_dsisr = dsisr;
 200
 201        spu->stop_callback(spu, 1);
 202
 203        spu->class_1_dar = 0;
 204        spu->class_1_dsisr = 0;
 205
 206        return 0;
 207}
 208
 209static void __spu_kernel_slb(void *addr, struct copro_slb *slb)
 210{
 211        unsigned long ea = (unsigned long)addr;
 212        u64 llp;
 213
 214        if (get_region_id(ea) == LINEAR_MAP_REGION_ID)
 215                llp = mmu_psize_defs[mmu_linear_psize].sllp;
 216        else
 217                llp = mmu_psize_defs[mmu_virtual_psize].sllp;
 218
 219        slb->vsid = (get_kernel_vsid(ea, MMU_SEGSIZE_256M) << SLB_VSID_SHIFT) |
 220                SLB_VSID_KERNEL | llp;
 221        slb->esid = (ea & ESID_MASK) | SLB_ESID_V;
 222}
 223
 224/**
 225 * Given an array of @nr_slbs SLB entries, @slbs, return non-zero if the
 226 * address @new_addr is present.
 227 */
 228static inline int __slb_present(struct copro_slb *slbs, int nr_slbs,
 229                void *new_addr)
 230{
 231        unsigned long ea = (unsigned long)new_addr;
 232        int i;
 233
 234        for (i = 0; i < nr_slbs; i++)
 235                if (!((slbs[i].esid ^ ea) & ESID_MASK))
 236                        return 1;
 237
 238        return 0;
 239}
 240
 241/**
 242 * Setup the SPU kernel SLBs, in preparation for a context save/restore. We
 243 * need to map both the context save area, and the save/restore code.
 244 *
 245 * Because the lscsa and code may cross segment boundaries, we check to see
 246 * if mappings are required for the start and end of each range. We currently
 247 * assume that the mappings are smaller that one segment - if not, something
 248 * is seriously wrong.
 249 */
 250void spu_setup_kernel_slbs(struct spu *spu, struct spu_lscsa *lscsa,
 251                void *code, int code_size)
 252{
 253        struct copro_slb slbs[4];
 254        int i, nr_slbs = 0;
 255        /* start and end addresses of both mappings */
 256        void *addrs[] = {
 257                lscsa, (void *)lscsa + sizeof(*lscsa) - 1,
 258                code, code + code_size - 1
 259        };
 260
 261        /* check the set of addresses, and create a new entry in the slbs array
 262         * if there isn't already a SLB for that address */
 263        for (i = 0; i < ARRAY_SIZE(addrs); i++) {
 264                if (__slb_present(slbs, nr_slbs, addrs[i]))
 265                        continue;
 266
 267                __spu_kernel_slb(addrs[i], &slbs[nr_slbs]);
 268                nr_slbs++;
 269        }
 270
 271        spin_lock_irq(&spu->register_lock);
 272        /* Add the set of SLBs */
 273        for (i = 0; i < nr_slbs; i++)
 274                spu_load_slb(spu, i, &slbs[i]);
 275        spin_unlock_irq(&spu->register_lock);
 276}
 277EXPORT_SYMBOL_GPL(spu_setup_kernel_slbs);
 278
 279static irqreturn_t
 280spu_irq_class_0(int irq, void *data)
 281{
 282        struct spu *spu;
 283        unsigned long stat, mask;
 284
 285        spu = data;
 286
 287        spin_lock(&spu->register_lock);
 288        mask = spu_int_mask_get(spu, 0);
 289        stat = spu_int_stat_get(spu, 0) & mask;
 290
 291        spu->class_0_pending |= stat;
 292        spu->class_0_dar = spu_mfc_dar_get(spu);
 293        spu->stop_callback(spu, 0);
 294        spu->class_0_pending = 0;
 295        spu->class_0_dar = 0;
 296
 297        spu_int_stat_clear(spu, 0, stat);
 298        spin_unlock(&spu->register_lock);
 299
 300        return IRQ_HANDLED;
 301}
 302
 303static irqreturn_t
 304spu_irq_class_1(int irq, void *data)
 305{
 306        struct spu *spu;
 307        unsigned long stat, mask, dar, dsisr;
 308
 309        spu = data;
 310
 311        /* atomically read & clear class1 status. */
 312        spin_lock(&spu->register_lock);
 313        mask  = spu_int_mask_get(spu, 1);
 314        stat  = spu_int_stat_get(spu, 1) & mask;
 315        dar   = spu_mfc_dar_get(spu);
 316        dsisr = spu_mfc_dsisr_get(spu);
 317        if (stat & CLASS1_STORAGE_FAULT_INTR)
 318                spu_mfc_dsisr_set(spu, 0ul);
 319        spu_int_stat_clear(spu, 1, stat);
 320
 321        pr_debug("%s: %lx %lx %lx %lx\n", __func__, mask, stat,
 322                        dar, dsisr);
 323
 324        if (stat & CLASS1_SEGMENT_FAULT_INTR)
 325                __spu_trap_data_seg(spu, dar);
 326
 327        if (stat & CLASS1_STORAGE_FAULT_INTR)
 328                __spu_trap_data_map(spu, dar, dsisr);
 329
 330        if (stat & CLASS1_LS_COMPARE_SUSPEND_ON_GET_INTR)
 331                ;
 332
 333        if (stat & CLASS1_LS_COMPARE_SUSPEND_ON_PUT_INTR)
 334                ;
 335
 336        spu->class_1_dsisr = 0;
 337        spu->class_1_dar = 0;
 338
 339        spin_unlock(&spu->register_lock);
 340
 341        return stat ? IRQ_HANDLED : IRQ_NONE;
 342}
 343
 344static irqreturn_t
 345spu_irq_class_2(int irq, void *data)
 346{
 347        struct spu *spu;
 348        unsigned long stat;
 349        unsigned long mask;
 350        const int mailbox_intrs =
 351                CLASS2_MAILBOX_THRESHOLD_INTR | CLASS2_MAILBOX_INTR;
 352
 353        spu = data;
 354        spin_lock(&spu->register_lock);
 355        stat = spu_int_stat_get(spu, 2);
 356        mask = spu_int_mask_get(spu, 2);
 357        /* ignore interrupts we're not waiting for */
 358        stat &= mask;
 359        /* mailbox interrupts are level triggered. mask them now before
 360         * acknowledging */
 361        if (stat & mailbox_intrs)
 362                spu_int_mask_and(spu, 2, ~(stat & mailbox_intrs));
 363        /* acknowledge all interrupts before the callbacks */
 364        spu_int_stat_clear(spu, 2, stat);
 365
 366        pr_debug("class 2 interrupt %d, %lx, %lx\n", irq, stat, mask);
 367
 368        if (stat & CLASS2_MAILBOX_INTR)
 369                spu->ibox_callback(spu);
 370
 371        if (stat & CLASS2_SPU_STOP_INTR)
 372                spu->stop_callback(spu, 2);
 373
 374        if (stat & CLASS2_SPU_HALT_INTR)
 375                spu->stop_callback(spu, 2);
 376
 377        if (stat & CLASS2_SPU_DMA_TAG_GROUP_COMPLETE_INTR)
 378                spu->mfc_callback(spu);
 379
 380        if (stat & CLASS2_MAILBOX_THRESHOLD_INTR)
 381                spu->wbox_callback(spu);
 382
 383        spu->stats.class2_intr++;
 384
 385        spin_unlock(&spu->register_lock);
 386
 387        return stat ? IRQ_HANDLED : IRQ_NONE;
 388}
 389
 390static int spu_request_irqs(struct spu *spu)
 391{
 392        int ret = 0;
 393
 394        if (spu->irqs[0]) {
 395                snprintf(spu->irq_c0, sizeof (spu->irq_c0), "spe%02d.0",
 396                         spu->number);
 397                ret = request_irq(spu->irqs[0], spu_irq_class_0,
 398                                  0, spu->irq_c0, spu);
 399                if (ret)
 400                        goto bail0;
 401        }
 402        if (spu->irqs[1]) {
 403                snprintf(spu->irq_c1, sizeof (spu->irq_c1), "spe%02d.1",
 404                         spu->number);
 405                ret = request_irq(spu->irqs[1], spu_irq_class_1,
 406                                  0, spu->irq_c1, spu);
 407                if (ret)
 408                        goto bail1;
 409        }
 410        if (spu->irqs[2]) {
 411                snprintf(spu->irq_c2, sizeof (spu->irq_c2), "spe%02d.2",
 412                         spu->number);
 413                ret = request_irq(spu->irqs[2], spu_irq_class_2,
 414                                  0, spu->irq_c2, spu);
 415                if (ret)
 416                        goto bail2;
 417        }
 418        return 0;
 419
 420bail2:
 421        if (spu->irqs[1])
 422                free_irq(spu->irqs[1], spu);
 423bail1:
 424        if (spu->irqs[0])
 425                free_irq(spu->irqs[0], spu);
 426bail0:
 427        return ret;
 428}
 429
 430static void spu_free_irqs(struct spu *spu)
 431{
 432        if (spu->irqs[0])
 433                free_irq(spu->irqs[0], spu);
 434        if (spu->irqs[1])
 435                free_irq(spu->irqs[1], spu);
 436        if (spu->irqs[2])
 437                free_irq(spu->irqs[2], spu);
 438}
 439
 440void spu_init_channels(struct spu *spu)
 441{
 442        static const struct {
 443                 unsigned channel;
 444                 unsigned count;
 445        } zero_list[] = {
 446                { 0x00, 1, }, { 0x01, 1, }, { 0x03, 1, }, { 0x04, 1, },
 447                { 0x18, 1, }, { 0x19, 1, }, { 0x1b, 1, }, { 0x1d, 1, },
 448        }, count_list[] = {
 449                { 0x00, 0, }, { 0x03, 0, }, { 0x04, 0, }, { 0x15, 16, },
 450                { 0x17, 1, }, { 0x18, 0, }, { 0x19, 0, }, { 0x1b, 0, },
 451                { 0x1c, 1, }, { 0x1d, 0, }, { 0x1e, 1, },
 452        };
 453        struct spu_priv2 __iomem *priv2;
 454        int i;
 455
 456        priv2 = spu->priv2;
 457
 458        /* initialize all channel data to zero */
 459        for (i = 0; i < ARRAY_SIZE(zero_list); i++) {
 460                int count;
 461
 462                out_be64(&priv2->spu_chnlcntptr_RW, zero_list[i].channel);
 463                for (count = 0; count < zero_list[i].count; count++)
 464                        out_be64(&priv2->spu_chnldata_RW, 0);
 465        }
 466
 467        /* initialize channel counts to meaningful values */
 468        for (i = 0; i < ARRAY_SIZE(count_list); i++) {
 469                out_be64(&priv2->spu_chnlcntptr_RW, count_list[i].channel);
 470                out_be64(&priv2->spu_chnlcnt_RW, count_list[i].count);
 471        }
 472}
 473EXPORT_SYMBOL_GPL(spu_init_channels);
 474
 475static struct bus_type spu_subsys = {
 476        .name = "spu",
 477        .dev_name = "spu",
 478};
 479
 480int spu_add_dev_attr(struct device_attribute *attr)
 481{
 482        struct spu *spu;
 483
 484        mutex_lock(&spu_full_list_mutex);
 485        list_for_each_entry(spu, &spu_full_list, full_list)
 486                device_create_file(&spu->dev, attr);
 487        mutex_unlock(&spu_full_list_mutex);
 488
 489        return 0;
 490}
 491EXPORT_SYMBOL_GPL(spu_add_dev_attr);
 492
 493int spu_add_dev_attr_group(struct attribute_group *attrs)
 494{
 495        struct spu *spu;
 496        int rc = 0;
 497
 498        mutex_lock(&spu_full_list_mutex);
 499        list_for_each_entry(spu, &spu_full_list, full_list) {
 500                rc = sysfs_create_group(&spu->dev.kobj, attrs);
 501
 502                /* we're in trouble here, but try unwinding anyway */
 503                if (rc) {
 504                        printk(KERN_ERR "%s: can't create sysfs group '%s'\n",
 505                                        __func__, attrs->name);
 506
 507                        list_for_each_entry_continue_reverse(spu,
 508                                        &spu_full_list, full_list)
 509                                sysfs_remove_group(&spu->dev.kobj, attrs);
 510                        break;
 511                }
 512        }
 513
 514        mutex_unlock(&spu_full_list_mutex);
 515
 516        return rc;
 517}
 518EXPORT_SYMBOL_GPL(spu_add_dev_attr_group);
 519
 520
 521void spu_remove_dev_attr(struct device_attribute *attr)
 522{
 523        struct spu *spu;
 524
 525        mutex_lock(&spu_full_list_mutex);
 526        list_for_each_entry(spu, &spu_full_list, full_list)
 527                device_remove_file(&spu->dev, attr);
 528        mutex_unlock(&spu_full_list_mutex);
 529}
 530EXPORT_SYMBOL_GPL(spu_remove_dev_attr);
 531
 532void spu_remove_dev_attr_group(struct attribute_group *attrs)
 533{
 534        struct spu *spu;
 535
 536        mutex_lock(&spu_full_list_mutex);
 537        list_for_each_entry(spu, &spu_full_list, full_list)
 538                sysfs_remove_group(&spu->dev.kobj, attrs);
 539        mutex_unlock(&spu_full_list_mutex);
 540}
 541EXPORT_SYMBOL_GPL(spu_remove_dev_attr_group);
 542
 543static int spu_create_dev(struct spu *spu)
 544{
 545        int ret;
 546
 547        spu->dev.id = spu->number;
 548        spu->dev.bus = &spu_subsys;
 549        ret = device_register(&spu->dev);
 550        if (ret) {
 551                printk(KERN_ERR "Can't register SPU %d with sysfs\n",
 552                                spu->number);
 553                return ret;
 554        }
 555
 556        sysfs_add_device_to_node(&spu->dev, spu->node);
 557
 558        return 0;
 559}
 560
 561static int __init create_spu(void *data)
 562{
 563        struct spu *spu;
 564        int ret;
 565        static int number;
 566        unsigned long flags;
 567
 568        ret = -ENOMEM;
 569        spu = kzalloc(sizeof (*spu), GFP_KERNEL);
 570        if (!spu)
 571                goto out;
 572
 573        spu->alloc_state = SPU_FREE;
 574
 575        spin_lock_init(&spu->register_lock);
 576        spin_lock(&spu_lock);
 577        spu->number = number++;
 578        spin_unlock(&spu_lock);
 579
 580        ret = spu_create_spu(spu, data);
 581
 582        if (ret)
 583                goto out_free;
 584
 585        spu_mfc_sdr_setup(spu);
 586        spu_mfc_sr1_set(spu, 0x33);
 587        ret = spu_request_irqs(spu);
 588        if (ret)
 589                goto out_destroy;
 590
 591        ret = spu_create_dev(spu);
 592        if (ret)
 593                goto out_free_irqs;
 594
 595        mutex_lock(&cbe_spu_info[spu->node].list_mutex);
 596        list_add(&spu->cbe_list, &cbe_spu_info[spu->node].spus);
 597        cbe_spu_info[spu->node].n_spus++;
 598        mutex_unlock(&cbe_spu_info[spu->node].list_mutex);
 599
 600        mutex_lock(&spu_full_list_mutex);
 601        spin_lock_irqsave(&spu_full_list_lock, flags);
 602        list_add(&spu->full_list, &spu_full_list);
 603        spin_unlock_irqrestore(&spu_full_list_lock, flags);
 604        mutex_unlock(&spu_full_list_mutex);
 605
 606        spu->stats.util_state = SPU_UTIL_IDLE_LOADED;
 607        spu->stats.tstamp = ktime_get_ns();
 608
 609        INIT_LIST_HEAD(&spu->aff_list);
 610
 611        goto out;
 612
 613out_free_irqs:
 614        spu_free_irqs(spu);
 615out_destroy:
 616        spu_destroy_spu(spu);
 617out_free:
 618        kfree(spu);
 619out:
 620        return ret;
 621}
 622
 623static const char *spu_state_names[] = {
 624        "user", "system", "iowait", "idle"
 625};
 626
 627static unsigned long long spu_acct_time(struct spu *spu,
 628                enum spu_utilization_state state)
 629{
 630        unsigned long long time = spu->stats.times[state];
 631
 632        /*
 633         * If the spu is idle or the context is stopped, utilization
 634         * statistics are not updated.  Apply the time delta from the
 635         * last recorded state of the spu.
 636         */
 637        if (spu->stats.util_state == state)
 638                time += ktime_get_ns() - spu->stats.tstamp;
 639
 640        return time / NSEC_PER_MSEC;
 641}
 642
 643
 644static ssize_t spu_stat_show(struct device *dev,
 645                                struct device_attribute *attr, char *buf)
 646{
 647        struct spu *spu = container_of(dev, struct spu, dev);
 648
 649        return sprintf(buf, "%s %llu %llu %llu %llu "
 650                      "%llu %llu %llu %llu %llu %llu %llu %llu\n",
 651                spu_state_names[spu->stats.util_state],
 652                spu_acct_time(spu, SPU_UTIL_USER),
 653                spu_acct_time(spu, SPU_UTIL_SYSTEM),
 654                spu_acct_time(spu, SPU_UTIL_IOWAIT),
 655                spu_acct_time(spu, SPU_UTIL_IDLE_LOADED),
 656                spu->stats.vol_ctx_switch,
 657                spu->stats.invol_ctx_switch,
 658                spu->stats.slb_flt,
 659                spu->stats.hash_flt,
 660                spu->stats.min_flt,
 661                spu->stats.maj_flt,
 662                spu->stats.class2_intr,
 663                spu->stats.libassist);
 664}
 665
 666static DEVICE_ATTR(stat, 0444, spu_stat_show, NULL);
 667
 668#ifdef CONFIG_KEXEC_CORE
 669
 670struct crash_spu_info {
 671        struct spu *spu;
 672        u32 saved_spu_runcntl_RW;
 673        u32 saved_spu_status_R;
 674        u32 saved_spu_npc_RW;
 675        u64 saved_mfc_sr1_RW;
 676        u64 saved_mfc_dar;
 677        u64 saved_mfc_dsisr;
 678};
 679
 680#define CRASH_NUM_SPUS  16      /* Enough for current hardware */
 681static struct crash_spu_info crash_spu_info[CRASH_NUM_SPUS];
 682
 683static void crash_kexec_stop_spus(void)
 684{
 685        struct spu *spu;
 686        int i;
 687        u64 tmp;
 688
 689        for (i = 0; i < CRASH_NUM_SPUS; i++) {
 690                if (!crash_spu_info[i].spu)
 691                        continue;
 692
 693                spu = crash_spu_info[i].spu;
 694
 695                crash_spu_info[i].saved_spu_runcntl_RW =
 696                        in_be32(&spu->problem->spu_runcntl_RW);
 697                crash_spu_info[i].saved_spu_status_R =
 698                        in_be32(&spu->problem->spu_status_R);
 699                crash_spu_info[i].saved_spu_npc_RW =
 700                        in_be32(&spu->problem->spu_npc_RW);
 701
 702                crash_spu_info[i].saved_mfc_dar    = spu_mfc_dar_get(spu);
 703                crash_spu_info[i].saved_mfc_dsisr  = spu_mfc_dsisr_get(spu);
 704                tmp = spu_mfc_sr1_get(spu);
 705                crash_spu_info[i].saved_mfc_sr1_RW = tmp;
 706
 707                tmp &= ~MFC_STATE1_MASTER_RUN_CONTROL_MASK;
 708                spu_mfc_sr1_set(spu, tmp);
 709
 710                __delay(200);
 711        }
 712}
 713
 714static void crash_register_spus(struct list_head *list)
 715{
 716        struct spu *spu;
 717        int ret;
 718
 719        list_for_each_entry(spu, list, full_list) {
 720                if (WARN_ON(spu->number >= CRASH_NUM_SPUS))
 721                        continue;
 722
 723                crash_spu_info[spu->number].spu = spu;
 724        }
 725
 726        ret = crash_shutdown_register(&crash_kexec_stop_spus);
 727        if (ret)
 728                printk(KERN_ERR "Could not register SPU crash handler");
 729}
 730
 731#else
 732static inline void crash_register_spus(struct list_head *list)
 733{
 734}
 735#endif
 736
 737static void spu_shutdown(void)
 738{
 739        struct spu *spu;
 740
 741        mutex_lock(&spu_full_list_mutex);
 742        list_for_each_entry(spu, &spu_full_list, full_list) {
 743                spu_free_irqs(spu);
 744                spu_destroy_spu(spu);
 745        }
 746        mutex_unlock(&spu_full_list_mutex);
 747}
 748
 749static struct syscore_ops spu_syscore_ops = {
 750        .shutdown = spu_shutdown,
 751};
 752
 753static int __init init_spu_base(void)
 754{
 755        int i, ret = 0;
 756
 757        for (i = 0; i < MAX_NUMNODES; i++) {
 758                mutex_init(&cbe_spu_info[i].list_mutex);
 759                INIT_LIST_HEAD(&cbe_spu_info[i].spus);
 760        }
 761
 762        if (!spu_management_ops)
 763                goto out;
 764
 765        /* create system subsystem for spus */
 766        ret = subsys_system_register(&spu_subsys, NULL);
 767        if (ret)
 768                goto out;
 769
 770        ret = spu_enumerate_spus(create_spu);
 771
 772        if (ret < 0) {
 773                printk(KERN_WARNING "%s: Error initializing spus\n",
 774                        __func__);
 775                goto out_unregister_subsys;
 776        }
 777
 778        if (ret > 0)
 779                fb_append_extra_logo(&logo_spe_clut224, ret);
 780
 781        mutex_lock(&spu_full_list_mutex);
 782        xmon_register_spus(&spu_full_list);
 783        crash_register_spus(&spu_full_list);
 784        mutex_unlock(&spu_full_list_mutex);
 785        spu_add_dev_attr(&dev_attr_stat);
 786        register_syscore_ops(&spu_syscore_ops);
 787
 788        spu_init_affinity();
 789
 790        return 0;
 791
 792 out_unregister_subsys:
 793        bus_unregister(&spu_subsys);
 794 out:
 795        return ret;
 796}
 797device_initcall(init_spu_base);
 798
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.