spu_base.c

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/*
 * Low-level SPU handling
 *
 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
 *
 * Author: Arnd Bergmann <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#undef DEBUG

#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/wait.h>
#include <linux/mm.h>
#include <linux/io.h>
#include <linux/mutex.h>
#include <linux/linux_logo.h>
#include <linux/syscore_ops.h>
#include <asm/spu.h>
#include <asm/spu_priv1.h>
#include <asm/spu_csa.h>
#include <asm/xmon.h>
#include <asm/prom.h>
#include <asm/kexec.h>

const struct spu_management_ops *spu_management_ops;
EXPORT_SYMBOL_GPL(spu_management_ops);

const struct spu_priv1_ops *spu_priv1_ops;
EXPORT_SYMBOL_GPL(spu_priv1_ops);

struct cbe_spu_info cbe_spu_info[MAX_NUMNODES];
EXPORT_SYMBOL_GPL(cbe_spu_info);

/*
 * The spufs fault-handling code needs to call force_sig_info to raise signals
 * on DMA errors. Export it here to avoid general kernel-wide access to this
 * function
 */
EXPORT_SYMBOL_GPL(force_sig_info);

/*
 * Protects cbe_spu_info and spu->number.
 */
static DEFINE_SPINLOCK(spu_lock);

/*
 * List of all spus in the system.
 *
 * This list is iterated by callers from irq context and callers that
 * want to sleep.  Thus modifications need to be done with both
 * spu_full_list_lock and spu_full_list_mutex held, while iterating
 * through it requires either of these locks.
 *
 * In addition spu_full_list_lock protects all assignmens to
 * spu->mm.
 */
static LIST_HEAD(spu_full_list);
static DEFINE_SPINLOCK(spu_full_list_lock);
static DEFINE_MUTEX(spu_full_list_mutex);

struct spu_slb {
    u64 esid, vsid;
};

void spu_invalidate_slbs(struct spu *spu)
{
    struct spu_priv2 __iomem *priv2 = spu->priv2;
    unsigned long flags;

    spin_lock_irqsave(&spu->register_lock, flags);
    if (spu_mfc_sr1_get(spu) & MFC_STATE1_RELOCATE_MASK)
        out_be64(&priv2->slb_invalidate_all_W, 0UL);
    spin_unlock_irqrestore(&spu->register_lock, flags);
}
EXPORT_SYMBOL_GPL(spu_invalidate_slbs);

/* This is called by the MM core when a segment size is changed, to
 * request a flush of all the SPEs using a given mm
 */
void spu_flush_all_slbs(struct mm_struct *mm)
{
    struct spu *spu;
    unsigned long flags;

    spin_lock_irqsave(&spu_full_list_lock, flags);
    list_for_each_entry(spu, &spu_full_list, full_list) {
        if (spu->mm == mm)
            spu_invalidate_slbs(spu);
    }
    spin_unlock_irqrestore(&spu_full_list_lock, flags);
}

/* The hack below stinks... try to do something better one of
 * these days... Does it even work properly with NR_CPUS == 1 ?
 */
static inline void mm_needs_global_tlbie(struct mm_struct *mm)
{
    int nr = (NR_CPUS > 1) ? NR_CPUS : NR_CPUS + 1;

    /* Global TLBIE broadcast required with SPEs. */
    bitmap_fill(cpumask_bits(mm_cpumask(mm)), nr);
}

void spu_associate_mm(struct spu *spu, struct mm_struct *mm)
{
    unsigned long flags;

    spin_lock_irqsave(&spu_full_list_lock, flags);
    spu->mm = mm;
    spin_unlock_irqrestore(&spu_full_list_lock, flags);
    if (mm)
        mm_needs_global_tlbie(mm);
}
EXPORT_SYMBOL_GPL(spu_associate_mm);

int spu_64k_pages_available(void)
{
    return mmu_psize_defs[MMU_PAGE_64K].shift != 0;
}
EXPORT_SYMBOL_GPL(spu_64k_pages_available);

static void spu_restart_dma(struct spu *spu)
{
    struct spu_priv2 __iomem *priv2 = spu->priv2;

    if (!test_bit(SPU_CONTEXT_SWITCH_PENDING, &spu->flags))
        out_be64(&priv2->mfc_control_RW, MFC_CNTL_RESTART_DMA_COMMAND);
    else {
        set_bit(SPU_CONTEXT_FAULT_PENDING, &spu->flags);
        mb();
    }
}

static inline void spu_load_slb(struct spu *spu, int slbe, struct spu_slb *slb)
{
    struct spu_priv2 __iomem *priv2 = spu->priv2;

    pr_debug("%s: adding SLB[%d] 0x%016llx 0x%016llx\n",
            __func__, slbe, slb->vsid, slb->esid);

    out_be64(&priv2->slb_index_W, slbe);
    /* set invalid before writing vsid */
    out_be64(&priv2->slb_esid_RW, 0);
    /* now it's safe to write the vsid */
    out_be64(&priv2->slb_vsid_RW, slb->vsid);
    /* setting the new esid makes the entry valid again */
    out_be64(&priv2->slb_esid_RW, slb->esid);
}

static int __spu_trap_data_seg(struct spu *spu, unsigned long ea)
{
    struct mm_struct *mm = spu->mm;
    struct spu_slb slb;
    int psize;

    pr_debug("%s\n", __func__);

    slb.esid = (ea & ESID_MASK) | SLB_ESID_V;

    switch(REGION_ID(ea)) {
    case USER_REGION_ID:
#ifdef CONFIG_PPC_MM_SLICES
        psize = get_slice_psize(mm, ea);
#else
        psize = mm->context.user_psize;
#endif
        slb.vsid = (get_vsid(mm->context.id, ea, MMU_SEGSIZE_256M)
                << SLB_VSID_SHIFT) | SLB_VSID_USER;
        break;
    case VMALLOC_REGION_ID:
        if (ea < VMALLOC_END)
            psize = mmu_vmalloc_psize;
        else
            psize = mmu_io_psize;
        slb.vsid = (get_kernel_vsid(ea, MMU_SEGSIZE_256M)
                << SLB_VSID_SHIFT) | SLB_VSID_KERNEL;
        break;
    case KERNEL_REGION_ID:
        psize = mmu_linear_psize;
        slb.vsid = (get_kernel_vsid(ea, MMU_SEGSIZE_256M)
                << SLB_VSID_SHIFT) | SLB_VSID_KERNEL;
        break;
    default:
        /* Future: support kernel segments so that drivers
         * can use SPUs.
         */
        pr_debug("invalid region access at %016lx\n", ea);
        return 1;
    }
    slb.vsid |= mmu_psize_defs[psize].sllp;

    spu_load_slb(spu, spu->slb_replace, &slb);

    spu->slb_replace++;
    if (spu->slb_replace >= 8)
        spu->slb_replace = 0;

    spu_restart_dma(spu);
    spu->stats.slb_flt++;
    return 0;
}

extern int hash_page(unsigned long ea, unsigned long access, unsigned long trap); //XXX
static int __spu_trap_data_map(struct spu *spu, unsigned long ea, u64 dsisr)
{
    int ret;

    pr_debug("%s, %llx, %lx\n", __func__, dsisr, ea);

    /*
     * Handle kernel space hash faults immediately. User hash
     * faults need to be deferred to process context.
     */
    if ((dsisr & MFC_DSISR_PTE_NOT_FOUND) &&
        (REGION_ID(ea) != USER_REGION_ID)) {

        spin_unlock(&spu->register_lock);
        ret = hash_page(ea, _PAGE_PRESENT, 0x300);
        spin_lock(&spu->register_lock);

        if (!ret) {
            spu_restart_dma(spu);
            return 0;
        }
    }

    spu->class_1_dar = ea;
    spu->class_1_dsisr = dsisr;

    spu->stop_callback(spu, 1);

    spu->class_1_dar = 0;
    spu->class_1_dsisr = 0;

    return 0;
}

static void __spu_kernel_slb(void *addr, struct spu_slb *slb)
{
    unsigned long ea = (unsigned long)addr;
    u64 llp;

    if (REGION_ID(ea) == KERNEL_REGION_ID)
        llp = mmu_psize_defs[mmu_linear_psize].sllp;
    else
        llp = mmu_psize_defs[mmu_virtual_psize].sllp;

    slb->vsid = (get_kernel_vsid(ea, MMU_SEGSIZE_256M) << SLB_VSID_SHIFT) |
        SLB_VSID_KERNEL | llp;
    slb->esid = (ea & ESID_MASK) | SLB_ESID_V;
}

static inline int __slb_present(struct spu_slb *slbs, int nr_slbs,
        void *new_addr)
{
    unsigned long ea = (unsigned long)new_addr;
    int i;

    for (i = 0; i < nr_slbs; i++)
        if (!((slbs[i].esid ^ ea) & ESID_MASK))
            return 1;

    return 0;
}

void spu_setup_kernel_slbs(struct spu *spu, struct spu_lscsa *lscsa,
        void *code, int code_size)
{
    struct spu_slb slbs[4];
    int i, nr_slbs = 0;
    /* start and end addresses of both mappings */
    void *addrs[] = {
        lscsa, (void *)lscsa + sizeof(*lscsa) - 1,
        code, code + code_size - 1
    };

    /* check the set of addresses, and create a new entry in the slbs array
     * if there isn't already a SLB for that address */
    for (i = 0; i < ARRAY_SIZE(addrs); i++) {
        if (__slb_present(slbs, nr_slbs, addrs[i]))
            continue;

        __spu_kernel_slb(addrs[i], &slbs[nr_slbs]);
        nr_slbs++;
    }

    spin_lock_irq(&spu->register_lock);
    /* Add the set of SLBs */
    for (i = 0; i < nr_slbs; i++)
        spu_load_slb(spu, i, &slbs[i]);
    spin_unlock_irq(&spu->register_lock);
}
EXPORT_SYMBOL_GPL(spu_setup_kernel_slbs);

static irqreturn_t
spu_irq_class_0(int irq, void *data)
{
    struct spu *spu;
    unsigned long stat, mask;

    spu = data;

    spin_lock(&spu->register_lock);
    mask = spu_int_mask_get(spu, 0);
    stat = spu_int_stat_get(spu, 0) & mask;

    spu->class_0_pending |= stat;
    spu->class_0_dar = spu_mfc_dar_get(spu);
    spu->stop_callback(spu, 0);
    spu->class_0_pending = 0;
    spu->class_0_dar = 0;

    spu_int_stat_clear(spu, 0, stat);
    spin_unlock(&spu->register_lock);

    return IRQ_HANDLED;
}

static irqreturn_t
spu_irq_class_1(int irq, void *data)
{
    struct spu *spu;
    unsigned long stat, mask, dar, dsisr;

    spu = data;

    /* atomically read & clear class1 status. */
    spin_lock(&spu->register_lock);
    mask  = spu_int_mask_get(spu, 1);
    stat  = spu_int_stat_get(spu, 1) & mask;
    dar   = spu_mfc_dar_get(spu);
    dsisr = spu_mfc_dsisr_get(spu);
    if (stat & CLASS1_STORAGE_FAULT_INTR)
        spu_mfc_dsisr_set(spu, 0ul);
    spu_int_stat_clear(spu, 1, stat);

    pr_debug("%s: %lx %lx %lx %lx\n", __func__, mask, stat,
            dar, dsisr);

    if (stat & CLASS1_SEGMENT_FAULT_INTR)
        __spu_trap_data_seg(spu, dar);

    if (stat & CLASS1_STORAGE_FAULT_INTR)
        __spu_trap_data_map(spu, dar, dsisr);

    if (stat & CLASS1_LS_COMPARE_SUSPEND_ON_GET_INTR)
        ;

    if (stat & CLASS1_LS_COMPARE_SUSPEND_ON_PUT_INTR)
        ;

    spu->class_1_dsisr = 0;
    spu->class_1_dar = 0;

    spin_unlock(&spu->register_lock);

    return stat ? IRQ_HANDLED : IRQ_NONE;
}

static irqreturn_t
spu_irq_class_2(int irq, void *data)
{
    struct spu *spu;
    unsigned long stat;
    unsigned long mask;
    const int mailbox_intrs =
        CLASS2_MAILBOX_THRESHOLD_INTR | CLASS2_MAILBOX_INTR;

    spu = data;
    spin_lock(&spu->register_lock);
    stat = spu_int_stat_get(spu, 2);
    mask = spu_int_mask_get(spu, 2);
    /* ignore interrupts we're not waiting for */
    stat &= mask;
    /* mailbox interrupts are level triggered. mask them now before
     * acknowledging */
    if (stat & mailbox_intrs)
        spu_int_mask_and(spu, 2, ~(stat & mailbox_intrs));
    /* acknowledge all interrupts before the callbacks */
    spu_int_stat_clear(spu, 2, stat);

    pr_debug("class 2 interrupt %d, %lx, %lx\n", irq, stat, mask);

    if (stat & CLASS2_MAILBOX_INTR)
        spu->ibox_callback(spu);

    if (stat & CLASS2_SPU_STOP_INTR)
        spu->stop_callback(spu, 2);

    if (stat & CLASS2_SPU_HALT_INTR)
        spu->stop_callback(spu, 2);

    if (stat & CLASS2_SPU_DMA_TAG_GROUP_COMPLETE_INTR)
        spu->mfc_callback(spu);

    if (stat & CLASS2_MAILBOX_THRESHOLD_INTR)
        spu->wbox_callback(spu);

    spu->stats.class2_intr++;

    spin_unlock(&spu->register_lock);

    return stat ? IRQ_HANDLED : IRQ_NONE;
}

static int spu_request_irqs(struct spu *spu)
{
    int ret = 0;

    if (spu->irqs[0] != NO_IRQ) {
        snprintf(spu->irq_c0, sizeof (spu->irq_c0), "spe%02d.0",
             spu->number);
        ret = request_irq(spu->irqs[0], spu_irq_class_0,
                  0, spu->irq_c0, spu);
        if (ret)
            goto bail0;
    }
    if (spu->irqs[1] != NO_IRQ) {
        snprintf(spu->irq_c1, sizeof (spu->irq_c1), "spe%02d.1",
             spu->number);
        ret = request_irq(spu->irqs[1], spu_irq_class_1,
                  0, spu->irq_c1, spu);
        if (ret)
            goto bail1;
    }
    if (spu->irqs[2] != NO_IRQ) {
        snprintf(spu->irq_c2, sizeof (spu->irq_c2), "spe%02d.2",
             spu->number);
        ret = request_irq(spu->irqs[2], spu_irq_class_2,
                  0, spu->irq_c2, spu);
        if (ret)
            goto bail2;
    }
    return 0;

bail2:
    if (spu->irqs[1] != NO_IRQ)
        free_irq(spu->irqs[1], spu);
bail1:
    if (spu->irqs[0] != NO_IRQ)
        free_irq(spu->irqs[0], spu);
bail0:
    return ret;
}

static void spu_free_irqs(struct spu *spu)
{
    if (spu->irqs[0] != NO_IRQ)
        free_irq(spu->irqs[0], spu);
    if (spu->irqs[1] != NO_IRQ)
        free_irq(spu->irqs[1], spu);
    if (spu->irqs[2] != NO_IRQ)
        free_irq(spu->irqs[2], spu);
}

void spu_init_channels(struct spu *spu)
{
    static const struct {
         unsigned channel;
         unsigned count;
    } zero_list[] = {
        { 0x00, 1, }, { 0x01, 1, }, { 0x03, 1, }, { 0x04, 1, },
        { 0x18, 1, }, { 0x19, 1, }, { 0x1b, 1, }, { 0x1d, 1, },
    }, count_list[] = {
        { 0x00, 0, }, { 0x03, 0, }, { 0x04, 0, }, { 0x15, 16, },
        { 0x17, 1, }, { 0x18, 0, }, { 0x19, 0, }, { 0x1b, 0, },
        { 0x1c, 1, }, { 0x1d, 0, }, { 0x1e, 1, },
    };
    struct spu_priv2 __iomem *priv2;
    int i;

    priv2 = spu->priv2;

    /* initialize all channel data to zero */
    for (i = 0; i < ARRAY_SIZE(zero_list); i++) {
        int count;

        out_be64(&priv2->spu_chnlcntptr_RW, zero_list[i].channel);
        for (count = 0; count < zero_list[i].count; count++)
            out_be64(&priv2->spu_chnldata_RW, 0);
    }

    /* initialize channel counts to meaningful values */
    for (i = 0; i < ARRAY_SIZE(count_list); i++) {
        out_be64(&priv2->spu_chnlcntptr_RW, count_list[i].channel);
        out_be64(&priv2->spu_chnlcnt_RW, count_list[i].count);
    }
}
EXPORT_SYMBOL_GPL(spu_init_channels);

static struct bus_type spu_subsys = {
    .name = "spu",
    .dev_name = "spu",
};

int spu_add_dev_attr(struct device_attribute *attr)
{
    struct spu *spu;

    mutex_lock(&spu_full_list_mutex);
    list_for_each_entry(spu, &spu_full_list, full_list)
        device_create_file(&spu->dev, attr);
    mutex_unlock(&spu_full_list_mutex);

    return 0;
}
EXPORT_SYMBOL_GPL(spu_add_dev_attr);

int spu_add_dev_attr_group(struct attribute_group *attrs)
{
    struct spu *spu;
    int rc = 0;

    mutex_lock(&spu_full_list_mutex);
    list_for_each_entry(spu, &spu_full_list, full_list) {
        rc = sysfs_create_group(&spu->dev.kobj, attrs);

        /* we're in trouble here, but try unwinding anyway */
        if (rc) {
            printk(KERN_ERR "%s: can't create sysfs group '%s'\n",
                    __func__, attrs->name);

            list_for_each_entry_continue_reverse(spu,
                    &spu_full_list, full_list)
                sysfs_remove_group(&spu->dev.kobj, attrs);
            break;
        }
    }

    mutex_unlock(&spu_full_list_mutex);

    return rc;
}
EXPORT_SYMBOL_GPL(spu_add_dev_attr_group);


void spu_remove_dev_attr(struct device_attribute *attr)
{
    struct spu *spu;

    mutex_lock(&spu_full_list_mutex);
    list_for_each_entry(spu, &spu_full_list, full_list)
        device_remove_file(&spu->dev, attr);
    mutex_unlock(&spu_full_list_mutex);
}
EXPORT_SYMBOL_GPL(spu_remove_dev_attr);

void spu_remove_dev_attr_group(struct attribute_group *attrs)
{
    struct spu *spu;

    mutex_lock(&spu_full_list_mutex);
    list_for_each_entry(spu, &spu_full_list, full_list)
        sysfs_remove_group(&spu->dev.kobj, attrs);
    mutex_unlock(&spu_full_list_mutex);
}
EXPORT_SYMBOL_GPL(spu_remove_dev_attr_group);

static int spu_create_dev(struct spu *spu)
{
    int ret;

    spu->dev.id = spu->number;
    spu->dev.bus = &spu_subsys;
    ret = device_register(&spu->dev);
    if (ret) {
        printk(KERN_ERR "Can't register SPU %d with sysfs\n",
                spu->number);
        return ret;
    }

    sysfs_add_device_to_node(&spu->dev, spu->node);

    return 0;
}

static int __init create_spu(void *data)
{
    struct spu *spu;
    int ret;
    static int number;
    unsigned long flags;
    struct timespec ts;

    ret = -ENOMEM;
    spu = kzalloc(sizeof (*spu), GFP_KERNEL);
    if (!spu)
        goto out;

    spu->alloc_state = SPU_FREE;

    spin_lock_init(&spu->register_lock);
    spin_lock(&spu_lock);
    spu->number = number++;
    spin_unlock(&spu_lock);

    ret = spu_create_spu(spu, data);

    if (ret)
        goto out_free;

    spu_mfc_sdr_setup(spu);
    spu_mfc_sr1_set(spu, 0x33);
    ret = spu_request_irqs(spu);
    if (ret)
        goto out_destroy;

    ret = spu_create_dev(spu);
    if (ret)
        goto out_free_irqs;

    mutex_lock(&cbe_spu_info[spu->node].list_mutex);
    list_add(&spu->cbe_list, &cbe_spu_info[spu->node].spus);
    cbe_spu_info[spu->node].n_spus++;
    mutex_unlock(&cbe_spu_info[spu->node].list_mutex);

    mutex_lock(&spu_full_list_mutex);
    spin_lock_irqsave(&spu_full_list_lock, flags);
    list_add(&spu->full_list, &spu_full_list);
    spin_unlock_irqrestore(&spu_full_list_lock, flags);
    mutex_unlock(&spu_full_list_mutex);

    spu->stats.util_state = SPU_UTIL_IDLE_LOADED;
    ktime_get_ts(&ts);
    spu->stats.tstamp = timespec_to_ns(&ts);

    INIT_LIST_HEAD(&spu->aff_list);

    goto out;

out_free_irqs:
    spu_free_irqs(spu);
out_destroy:
    spu_destroy_spu(spu);
out_free:
    kfree(spu);
out:
    return ret;
}

static const char *spu_state_names[] = {
    "user", "system", "iowait", "idle"
};

static unsigned long long spu_acct_time(struct spu *spu,
        enum spu_utilization_state state)
{
    struct timespec ts;
    unsigned long long time = spu->stats.times[state];

    /*
     * If the spu is idle or the context is stopped, utilization
     * statistics are not updated.  Apply the time delta from the
     * last recorded state of the spu.
     */
    if (spu->stats.util_state == state) {
        ktime_get_ts(&ts);
        time += timespec_to_ns(&ts) - spu->stats.tstamp;
    }

    return time / NSEC_PER_MSEC;
}


static ssize_t spu_stat_show(struct device *dev,
                struct device_attribute *attr, char *buf)
{
    struct spu *spu = container_of(dev, struct spu, dev);

    return sprintf(buf, "%s %llu %llu %llu %llu "
              "%llu %llu %llu %llu %llu %llu %llu %llu\n",
        spu_state_names[spu->stats.util_state],
        spu_acct_time(spu, SPU_UTIL_USER),
        spu_acct_time(spu, SPU_UTIL_SYSTEM),
        spu_acct_time(spu, SPU_UTIL_IOWAIT),
        spu_acct_time(spu, SPU_UTIL_IDLE_LOADED),
        spu->stats.vol_ctx_switch,
        spu->stats.invol_ctx_switch,
        spu->stats.slb_flt,
        spu->stats.hash_flt,
        spu->stats.min_flt,
        spu->stats.maj_flt,
        spu->stats.class2_intr,
        spu->stats.libassist);
}

static DEVICE_ATTR(stat, 0644, spu_stat_show, NULL);

#ifdef CONFIG_KEXEC

struct crash_spu_info {
    struct spu *spu;
    u32 saved_spu_runcntl_RW;
    u32 saved_spu_status_R;
    u32 saved_spu_npc_RW;
    u64 saved_mfc_sr1_RW;
    u64 saved_mfc_dar;
    u64 saved_mfc_dsisr;
};

#define CRASH_NUM_SPUS  16  /* Enough for current hardware */
static struct crash_spu_info crash_spu_info[CRASH_NUM_SPUS];

static void crash_kexec_stop_spus(void)
{
    struct spu *spu;
    int i;
    u64 tmp;

    for (i = 0; i < CRASH_NUM_SPUS; i++) {
        if (!crash_spu_info[i].spu)
            continue;

        spu = crash_spu_info[i].spu;

        crash_spu_info[i].saved_spu_runcntl_RW =
            in_be32(&spu->problem->spu_runcntl_RW);
        crash_spu_info[i].saved_spu_status_R =
            in_be32(&spu->problem->spu_status_R);
        crash_spu_info[i].saved_spu_npc_RW =
            in_be32(&spu->problem->spu_npc_RW);

        crash_spu_info[i].saved_mfc_dar    = spu_mfc_dar_get(spu);
        crash_spu_info[i].saved_mfc_dsisr  = spu_mfc_dsisr_get(spu);
        tmp = spu_mfc_sr1_get(spu);
        crash_spu_info[i].saved_mfc_sr1_RW = tmp;

        tmp &= ~MFC_STATE1_MASTER_RUN_CONTROL_MASK;
        spu_mfc_sr1_set(spu, tmp);

        __delay(200);
    }
}

static void crash_register_spus(struct list_head *list)
{
    struct spu *spu;
    int ret;

    list_for_each_entry(spu, list, full_list) {
        if (WARN_ON(spu->number >= CRASH_NUM_SPUS))
            continue;

        crash_spu_info[spu->number].spu = spu;
    }

    ret = crash_shutdown_register(&crash_kexec_stop_spus);
    if (ret)
        printk(KERN_ERR "Could not register SPU crash handler");
}

#else
static inline void crash_register_spus(struct list_head *list)
{
}
#endif

static void spu_shutdown(void)
{
    struct spu *spu;

    mutex_lock(&spu_full_list_mutex);
    list_for_each_entry(spu, &spu_full_list, full_list) {
        spu_free_irqs(spu);
        spu_destroy_spu(spu);
    }
    mutex_unlock(&spu_full_list_mutex);
}

static struct syscore_ops spu_syscore_ops = {
    .shutdown = spu_shutdown,
};

static int __init init_spu_base(void)
{
    int i, ret = 0;

    for (i = 0; i < MAX_NUMNODES; i++) {
        mutex_init(&cbe_spu_info[i].list_mutex);
        INIT_LIST_HEAD(&cbe_spu_info[i].spus);
    }

    if (!spu_management_ops)
        goto out;

    /* create system subsystem for spus */
    ret = subsys_system_register(&spu_subsys, NULL);
    if (ret)
        goto out;

    ret = spu_enumerate_spus(create_spu);

    if (ret < 0) {
        printk(KERN_WARNING "%s: Error initializing spus\n",
            __func__);
        goto out_unregister_subsys;
    }

    if (ret > 0)
        fb_append_extra_logo(&logo_spe_clut224, ret);

    mutex_lock(&spu_full_list_mutex);
    xmon_register_spus(&spu_full_list);
    crash_register_spus(&spu_full_list);
    mutex_unlock(&spu_full_list_mutex);
    spu_add_dev_attr(&dev_attr_stat);
    register_syscore_ops(&spu_syscore_ops);

    spu_init_affinity();

    return 0;

 out_unregister_subsys:
    bus_unregister(&spu_subsys);
 out:
    return ret;
}
module_init(init_spu_base);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Arnd Bergmann <[email protected]>");