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spu_base.c

/*
 * Low-level SPU handling
 *
 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
 *
 * Author: Arnd Bergmann <arndb@de.ibm.com>
 *
 * 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 <asm/spu.h>
#include <asm/spu_priv1.h>
#include <asm/xmon.h>
#include <asm/prom.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);

/*
 * 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);

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

      if (spu_mfc_sr1_get(spu) & MFC_STATE1_RELOCATE_MASK)
            out_be64(&priv2->slb_invalidate_all_W, 0UL);
}
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. */
      __cpus_setall(&mm->cpu_vm_mask, 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);

static int __spu_trap_invalid_dma(struct spu *spu)
{
      pr_debug("%s\n", __FUNCTION__);
      spu->dma_callback(spu, SPE_EVENT_INVALID_DMA);
      return 0;
}

static int __spu_trap_dma_align(struct spu *spu)
{
      pr_debug("%s\n", __FUNCTION__);
      spu->dma_callback(spu, SPE_EVENT_DMA_ALIGNMENT);
      return 0;
}

static int __spu_trap_error(struct spu *spu)
{
      pr_debug("%s\n", __FUNCTION__);
      spu->dma_callback(spu, SPE_EVENT_SPE_ERROR);
      return 0;
}

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);
}

static int __spu_trap_data_seg(struct spu *spu, unsigned long ea)
{
      struct spu_priv2 __iomem *priv2 = spu->priv2;
      struct mm_struct *mm = spu->mm;
      u64 esid, vsid, llp;
      int psize;

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

      if (test_bit(SPU_CONTEXT_SWITCH_ACTIVE, &spu->flags)) {
            /* SLBs are pre-loaded for context switch, so
             * we should never get here!
             */
            printk("%s: invalid access during switch!\n", __func__);
            return 1;
      }
      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
            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;
            vsid = (get_kernel_vsid(ea, MMU_SEGSIZE_256M) << SLB_VSID_SHIFT) |
                  SLB_VSID_KERNEL;
            break;
      case KERNEL_REGION_ID:
            psize = mmu_linear_psize;
            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;
      }
      llp = mmu_psize_defs[psize].sllp;

      out_be64(&priv2->slb_index_W, spu->slb_replace);
      out_be64(&priv2->slb_vsid_RW, vsid | llp);
      out_be64(&priv2->slb_esid_RW, esid);

      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)
{
      pr_debug("%s, %lx, %lx\n", __FUNCTION__, 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
          && hash_page(ea, _PAGE_PRESENT, 0x300) == 0) {
            spu_restart_dma(spu);
            return 0;
      }

      if (test_bit(SPU_CONTEXT_SWITCH_ACTIVE, &spu->flags)) {
            printk("%s: invalid access during switch!\n", __func__);
            return 1;
      }

      spu->dar = ea;
      spu->dsisr = dsisr;
      mb();
      spu->stop_callback(spu);
      return 0;
}

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

      spu = data;

      mask = spu_int_mask_get(spu, 0);
      stat = spu_int_stat_get(spu, 0);
      stat &= mask;

      spin_lock(&spu->register_lock);
      spu->class_0_pending |= stat;
      spin_unlock(&spu->register_lock);

      spu->stop_callback(spu);

      spu_int_stat_clear(spu, 0, stat);

      return IRQ_HANDLED;
}

int
spu_irq_class_0_bottom(struct spu *spu)
{
      unsigned long flags;
      unsigned long stat;

      spin_lock_irqsave(&spu->register_lock, flags);
      stat = spu->class_0_pending;
      spu->class_0_pending = 0;

      if (stat & 1) /* invalid DMA alignment */
            __spu_trap_dma_align(spu);

      if (stat & 2) /* invalid MFC DMA */
            __spu_trap_invalid_dma(spu);

      if (stat & 4) /* error on SPU */
            __spu_trap_error(spu);

      spin_unlock_irqrestore(&spu->register_lock, flags);

      return (stat & 0x7) ? -EIO : 0;
}
EXPORT_SYMBOL_GPL(spu_irq_class_0_bottom);

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 & 2) /* mapping fault */
            spu_mfc_dsisr_set(spu, 0ul);
      spu_int_stat_clear(spu, 1, stat);
      spin_unlock(&spu->register_lock);
      pr_debug("%s: %lx %lx %lx %lx\n", __FUNCTION__, mask, stat,
                  dar, dsisr);

      if (stat & 1) /* segment fault */
            __spu_trap_data_seg(spu, dar);

      if (stat & 2) { /* mapping fault */
            __spu_trap_data_map(spu, dar, dsisr);
      }

      if (stat & 4) /* ls compare & suspend on get */
            ;

      if (stat & 8) /* ls compare & suspend on put */
            ;

      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;

      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 (0x1 and 0x10) are level triggered.
       * mask them now before acknowledging.
       */
      if (stat & 0x11)
            spu_int_mask_and(spu, 2, ~(stat & 0x11));
      /* acknowledge all interrupts before the callbacks */
      spu_int_stat_clear(spu, 2, stat);
      spin_unlock(&spu->register_lock);

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

      if (stat & 1)  /* PPC core mailbox */
            spu->ibox_callback(spu);

      if (stat & 2) /* SPU stop-and-signal */
            spu->stop_callback(spu);

      if (stat & 4) /* SPU halted */
            spu->stop_callback(spu);

      if (stat & 8) /* DMA tag group complete */
            spu->mfc_callback(spu);

      if (stat & 0x10) /* SPU mailbox threshold */
            spu->wbox_callback(spu);

      spu->stats.class2_intr++;
      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,
                          IRQF_DISABLED,
                          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,
                          IRQF_DISABLED,
                          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,
                          IRQF_DISABLED,
                          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 int spu_shutdown(struct sys_device *sysdev)
{
      struct spu *spu = container_of(sysdev, struct spu, sysdev);

      spu_free_irqs(spu);
      spu_destroy_spu(spu);
      return 0;
}

static struct sysdev_class spu_sysdev_class = {
      set_kset_name("spu"),
      .shutdown = spu_shutdown,
};

int spu_add_sysdev_attr(struct sysdev_attribute *attr)
{
      struct spu *spu;

      mutex_lock(&spu_full_list_mutex);
      list_for_each_entry(spu, &spu_full_list, full_list)
            sysdev_create_file(&spu->sysdev, attr);
      mutex_unlock(&spu_full_list_mutex);

      return 0;
}
EXPORT_SYMBOL_GPL(spu_add_sysdev_attr);

int spu_add_sysdev_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_create_group(&spu->sysdev.kobj, attrs);
      mutex_unlock(&spu_full_list_mutex);

      return 0;
}
EXPORT_SYMBOL_GPL(spu_add_sysdev_attr_group);


void spu_remove_sysdev_attr(struct sysdev_attribute *attr)
{
      struct spu *spu;

      mutex_lock(&spu_full_list_mutex);
      list_for_each_entry(spu, &spu_full_list, full_list)
            sysdev_remove_file(&spu->sysdev, attr);
      mutex_unlock(&spu_full_list_mutex);
}
EXPORT_SYMBOL_GPL(spu_remove_sysdev_attr);

void spu_remove_sysdev_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->sysdev.kobj, attrs);
      mutex_unlock(&spu_full_list_mutex);
}
EXPORT_SYMBOL_GPL(spu_remove_sysdev_attr_group);

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

      spu->sysdev.id = spu->number;
      spu->sysdev.cls = &spu_sysdev_class;
      ret = sysdev_register(&spu->sysdev);
      if (ret) {
            printk(KERN_ERR "Can't register SPU %d with sysfs\n",
                        spu->number);
            return ret;
      }

      sysfs_add_device_to_node(&spu->sysdev, 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_sysdev(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 sys_device *sysdev, char *buf)
{
      struct spu *spu = container_of(sysdev, struct spu, sysdev);

      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 SYSDEV_ATTR(stat, 0644, spu_stat_show, NULL);

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 sysdev class for spus */
      ret = sysdev_class_register(&spu_sysdev_class);
      if (ret)
            goto out;

      ret = spu_enumerate_spus(create_spu);

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

      if (ret > 0) {
            /*
             * We cannot put the forward declaration in
             * <linux/linux_logo.h> because of conflicting session type
             * conflicts for const and __initdata with different compiler
             * versions
             */
            extern const struct linux_logo logo_spe_clut224;

            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_sysdev_attr(&attr_stat);

      spu_init_affinity();

      return 0;

 out_unregister_sysdev_class:
      sysdev_class_unregister(&spu_sysdev_class);
 out:
      return ret;
}
module_init(init_spu_base);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");

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