From 2c911a14b74fa9cf815a936f310e4fa85bee77ce Mon Sep 17 00:00:00 2001 From: Luke Browning Date: Fri, 13 Jun 2008 14:17:35 +1000 Subject: [PATCH] powerpc/spufs: synchronize interaction between spu exception handling and time slicing Time slicing can occur at the same time as spu exception handling resulting in the wakeup of the wrong thread. This change uses the the spu's register_lock to enforce synchronization between bind/unbind and spu exception handling so that they are mutually exclusive. Signed-off-by: Luke Browning Signed-off-by: Jeremy Kerr --- arch/powerpc/platforms/cell/spu_base.c | 42 ++++++++++++++--------- arch/powerpc/platforms/cell/spufs/sched.c | 14 ++++++-- 2 files changed, 37 insertions(+), 19 deletions(-) diff --git a/arch/powerpc/platforms/cell/spu_base.c b/arch/powerpc/platforms/cell/spu_base.c index 96b5f0f1c11e..78f905bc6a42 100644 --- a/arch/powerpc/platforms/cell/spu_base.c +++ b/arch/powerpc/platforms/cell/spu_base.c @@ -219,15 +219,25 @@ static int __spu_trap_data_seg(struct spu *spu, unsigned long ea) 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, %lx, %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 - && hash_page(ea, _PAGE_PRESENT, 0x300) == 0) { - spu_restart_dma(spu); - return 0; + /* + * 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; @@ -325,14 +335,12 @@ spu_irq_class_0(int irq, void *data) spu->class_0_pending |= stat; spu->class_0_dar = spu_mfc_dar_get(spu); - spin_unlock(&spu->register_lock); - 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; } @@ -355,13 +363,12 @@ spu_irq_class_1(int irq, void *data) spu_mfc_dsisr_set(spu, 0ul); spu_int_stat_clear(spu, 1, stat); - if (stat & CLASS1_SEGMENT_FAULT_INTR) - __spu_trap_data_seg(spu, dar); - - spin_unlock(&spu->register_lock); 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); @@ -374,6 +381,8 @@ spu_irq_class_1(int irq, void *data) spu->class_1_dsisr = 0; spu->class_1_dar = 0; + spin_unlock(&spu->register_lock); + return stat ? IRQ_HANDLED : IRQ_NONE; } @@ -392,14 +401,12 @@ spu_irq_class_2(int irq, void *data) 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); - spin_unlock(&spu->register_lock); pr_debug("class 2 interrupt %d, %lx, %lx\n", irq, stat, mask); @@ -419,6 +426,9 @@ spu_irq_class_2(int irq, void *data) spu->wbox_callback(spu); spu->stats.class2_intr++; + + spin_unlock(&spu->register_lock); + return stat ? IRQ_HANDLED : IRQ_NONE; } diff --git a/arch/powerpc/platforms/cell/spufs/sched.c b/arch/powerpc/platforms/cell/spufs/sched.c index 745dd51ec37f..cd725670b1b5 100644 --- a/arch/powerpc/platforms/cell/spufs/sched.c +++ b/arch/powerpc/platforms/cell/spufs/sched.c @@ -230,19 +230,23 @@ static void spu_bind_context(struct spu *spu, struct spu_context *ctx) ctx->stats.slb_flt_base = spu->stats.slb_flt; ctx->stats.class2_intr_base = spu->stats.class2_intr; + spu_associate_mm(spu, ctx->owner); + + spin_lock_irq(&spu->register_lock); spu->ctx = ctx; spu->flags = 0; ctx->spu = spu; ctx->ops = &spu_hw_ops; spu->pid = current->pid; spu->tgid = current->tgid; - spu_associate_mm(spu, ctx->owner); spu->ibox_callback = spufs_ibox_callback; spu->wbox_callback = spufs_wbox_callback; spu->stop_callback = spufs_stop_callback; spu->mfc_callback = spufs_mfc_callback; - mb(); + spin_unlock_irq(&spu->register_lock); + spu_unmap_mappings(ctx); + spu_switch_log_notify(spu, ctx, SWITCH_LOG_START, 0); spu_restore(&ctx->csa, spu); spu->timestamp = jiffies; @@ -423,18 +427,22 @@ static void spu_unbind_context(struct spu *spu, struct spu_context *ctx) spu_unmap_mappings(ctx); spu_save(&ctx->csa, spu); spu_switch_log_notify(spu, ctx, SWITCH_LOG_STOP, 0); + + spin_lock_irq(&spu->register_lock); spu->timestamp = jiffies; ctx->state = SPU_STATE_SAVED; spu->ibox_callback = NULL; spu->wbox_callback = NULL; spu->stop_callback = NULL; spu->mfc_callback = NULL; - spu_associate_mm(spu, NULL); spu->pid = 0; spu->tgid = 0; ctx->ops = &spu_backing_ops; spu->flags = 0; spu->ctx = NULL; + spin_unlock_irq(&spu->register_lock); + + spu_associate_mm(spu, NULL); ctx->stats.slb_flt += (spu->stats.slb_flt - ctx->stats.slb_flt_base); -- 2.20.1