[PATCH] spufs: Improved SPU preemptability.
This patch makes it easier to preempt an SPU context by
having the scheduler hold ctx->state_sema for much shorter
periods of time.
As part of this restructuring, the control logic for the "run"
operation is moved from arch/ppc64/kernel/spu_base.c to
fs/spufs/file.c. Of course the base retains "bottom half"
handlers for class{0,1} irqs. The new run loop will re-acquire
an SPU if preempted.
From: Mark Nutter <mnutter@us.ibm.com>
Signed-off-by: Arnd Bergmann <arndb@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
hifive-unleashed-5.1
Arnd Bergmann
Paul Mackerras
parent
3b3d22cb84
commit
5110459f18
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@ -130,7 +130,8 @@ static int __spu_trap_data_map(struct spu *spu, unsigned long ea, u64 dsisr)
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spu->dar = ea;
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spu->dsisr = dsisr;
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mb();
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wake_up(&spu->stop_wq);
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if (spu->stop_callback)
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spu->stop_callback(spu);
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return 0;
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}
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@ -151,7 +152,8 @@ static int __spu_trap_stop(struct spu *spu)
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{
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pr_debug("%s\n", __FUNCTION__);
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spu->stop_code = in_be32(&spu->problem->spu_status_R);
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wake_up(&spu->stop_wq);
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if (spu->stop_callback)
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spu->stop_callback(spu);
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return 0;
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}
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@ -159,7 +161,8 @@ static int __spu_trap_halt(struct spu *spu)
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{
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pr_debug("%s\n", __FUNCTION__);
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spu->stop_code = in_be32(&spu->problem->spu_status_R);
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wake_up(&spu->stop_wq);
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if (spu->stop_callback)
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spu->stop_callback(spu);
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return 0;
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}
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@ -190,12 +193,13 @@ spu_irq_class_0(int irq, void *data, struct pt_regs *regs)
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spu = data;
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spu->class_0_pending = 1;
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wake_up(&spu->stop_wq);
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if (spu->stop_callback)
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spu->stop_callback(spu);
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return IRQ_HANDLED;
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}
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static int
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int
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spu_irq_class_0_bottom(struct spu *spu)
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{
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unsigned long stat;
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@ -214,8 +218,10 @@ spu_irq_class_0_bottom(struct spu *spu)
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__spu_trap_error(spu);
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out_be64(&spu->priv1->int_stat_class0_RW, stat);
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return 0;
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return (stat & 0x7) ? -EIO : 0;
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}
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EXPORT_SYMBOL_GPL(spu_irq_class_0_bottom);
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static irqreturn_t
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spu_irq_class_1(int irq, void *data, struct pt_regs *regs)
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@ -250,6 +256,7 @@ spu_irq_class_1(int irq, void *data, struct pt_regs *regs)
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return stat ? IRQ_HANDLED : IRQ_NONE;
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}
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EXPORT_SYMBOL_GPL(spu_irq_class_1_bottom);
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static irqreturn_t
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spu_irq_class_2(int irq, void *data, struct pt_regs *regs)
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@ -478,7 +485,7 @@ bad_area:
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return -EFAULT;
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}
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static int spu_handle_pte_fault(struct spu *spu)
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int spu_irq_class_1_bottom(struct spu *spu)
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{
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u64 ea, dsisr, access, error = 0UL;
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int ret = 0;
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@ -508,76 +515,6 @@ static int spu_handle_pte_fault(struct spu *spu)
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return ret;
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}
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static inline int spu_pending(struct spu *spu, u32 * stat)
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{
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struct spu_problem __iomem *prob = spu->problem;
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u64 pte_fault;
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*stat = in_be32(&prob->spu_status_R);
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pte_fault = spu->dsisr &
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(MFC_DSISR_PTE_NOT_FOUND | MFC_DSISR_ACCESS_DENIED);
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return (!(*stat & 0x1) || pte_fault || spu->class_0_pending) ? 1 : 0;
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}
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int spu_run(struct spu *spu)
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{
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struct spu_problem __iomem *prob;
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struct spu_priv1 __iomem *priv1;
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struct spu_priv2 __iomem *priv2;
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u32 status;
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int ret;
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prob = spu->problem;
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priv1 = spu->priv1;
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priv2 = spu->priv2;
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/* Let SPU run. */
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eieio();
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out_be32(&prob->spu_runcntl_RW, SPU_RUNCNTL_RUNNABLE);
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do {
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ret = wait_event_interruptible(spu->stop_wq,
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spu_pending(spu, &status));
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if (spu->dsisr &
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(MFC_DSISR_PTE_NOT_FOUND | MFC_DSISR_ACCESS_DENIED))
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ret = spu_handle_pte_fault(spu);
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if (spu->class_0_pending)
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spu_irq_class_0_bottom(spu);
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if (!ret && signal_pending(current))
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ret = -ERESTARTSYS;
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} while (!ret && !(status &
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(SPU_STATUS_STOPPED_BY_STOP |
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SPU_STATUS_STOPPED_BY_HALT)));
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/* Ensure SPU is stopped. */
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out_be32(&prob->spu_runcntl_RW, SPU_RUNCNTL_STOP);
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eieio();
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while (in_be32(&prob->spu_status_R) & SPU_STATUS_RUNNING)
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cpu_relax();
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out_be64(&priv2->slb_invalidate_all_W, 0);
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out_be64(&priv1->tlb_invalidate_entry_W, 0UL);
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eieio();
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/* Check for SPU breakpoint. */
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if (unlikely(current->ptrace & PT_PTRACED)) {
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status = in_be32(&prob->spu_status_R);
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if ((status & SPU_STATUS_STOPPED_BY_STOP)
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&& status >> SPU_STOP_STATUS_SHIFT == 0x3fff) {
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force_sig(SIGTRAP, current);
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ret = -ERESTARTSYS;
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}
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(spu_run);
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static void __iomem * __init map_spe_prop(struct device_node *n,
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const char *name)
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{
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@ -693,9 +630,9 @@ static int __init create_spu(struct device_node *spe)
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out_be64(&spu->priv1->mfc_sdr_RW, mfspr(SPRN_SDR1));
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out_be64(&spu->priv1->mfc_sr1_RW, 0x33);
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init_waitqueue_head(&spu->stop_wq);
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spu->ibox_callback = NULL;
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spu->wbox_callback = NULL;
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spu->stop_callback = NULL;
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down(&spu_mutex);
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spu->number = number++;
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@ -232,6 +232,23 @@ static char *spu_backing_get_ls(struct spu_context *ctx)
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return ctx->csa.lscsa->ls;
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}
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static void spu_backing_runcntl_write(struct spu_context *ctx, u32 val)
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{
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spin_lock(&ctx->csa.register_lock);
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ctx->csa.prob.spu_runcntl_RW = val;
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if (val & SPU_RUNCNTL_RUNNABLE) {
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ctx->csa.prob.spu_status_R |= SPU_STATUS_RUNNING;
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} else {
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ctx->csa.prob.spu_status_R &= ~SPU_STATUS_RUNNING;
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}
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spin_unlock(&ctx->csa.register_lock);
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}
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static void spu_backing_runcntl_stop(struct spu_context *ctx)
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{
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spu_backing_runcntl_write(ctx, SPU_RUNCNTL_STOP);
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}
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struct spu_context_ops spu_backing_ops = {
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.mbox_read = spu_backing_mbox_read,
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.mbox_stat_read = spu_backing_mbox_stat_read,
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@ -249,4 +266,6 @@ struct spu_context_ops spu_backing_ops = {
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.npc_write = spu_backing_npc_write,
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.status_read = spu_backing_status_read,
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.get_ls = spu_backing_get_ls,
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.runcntl_write = spu_backing_runcntl_write,
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.runcntl_stop = spu_backing_runcntl_stop,
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};
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@ -45,6 +45,7 @@ struct spu_context *alloc_spu_context(struct address_space *local_store)
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init_rwsem(&ctx->state_sema);
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init_waitqueue_head(&ctx->ibox_wq);
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init_waitqueue_head(&ctx->wbox_wq);
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init_waitqueue_head(&ctx->stop_wq);
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ctx->ibox_fasync = NULL;
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ctx->wbox_fasync = NULL;
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ctx->state = SPU_STATE_SAVED;
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@ -105,7 +106,7 @@ void spu_release(struct spu_context *ctx)
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up_read(&ctx->state_sema);
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}
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static void spu_unmap_mappings(struct spu_context *ctx)
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void spu_unmap_mappings(struct spu_context *ctx)
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{
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unmap_mapping_range(ctx->local_store, 0, LS_SIZE, 1);
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}
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@ -126,7 +127,6 @@ int spu_acquire_runnable(struct spu_context *ctx)
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down_write(&ctx->state_sema);
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if (ctx->state == SPU_STATE_SAVED) {
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spu_unmap_mappings(ctx);
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ret = spu_activate(ctx, 0);
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ctx->state = SPU_STATE_RUNNABLE;
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}
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@ -154,7 +154,6 @@ void spu_acquire_saved(struct spu_context *ctx)
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down_write(&ctx->state_sema);
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if (ctx->state == SPU_STATE_RUNNABLE) {
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spu_unmap_mappings(ctx);
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spu_deactivate(ctx);
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ctx->state = SPU_STATE_SAVED;
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}
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@ -25,6 +25,7 @@
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#include <linux/module.h>
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#include <linux/pagemap.h>
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#include <linux/poll.h>
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#include <linux/ptrace.h>
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#include <asm/io.h>
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#include <asm/semaphore.h>
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@ -540,26 +541,122 @@ static struct file_operations spufs_wbox_stat_fops = {
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.read = spufs_wbox_stat_read,
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};
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long spufs_run_spu(struct file *file, struct spu_context *ctx,
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u32 *npc, u32 *status)
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/* interrupt-level stop callback function. */
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void spufs_stop_callback(struct spu *spu)
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{
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struct spu_context *ctx = spu->ctx;
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wake_up_all(&ctx->stop_wq);
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}
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static inline int spu_stopped(struct spu_context *ctx, u32 * stat)
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{
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struct spu *spu;
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u64 pte_fault;
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*stat = ctx->ops->status_read(ctx);
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if (ctx->state != SPU_STATE_RUNNABLE)
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return 1;
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spu = ctx->spu;
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pte_fault = spu->dsisr &
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(MFC_DSISR_PTE_NOT_FOUND | MFC_DSISR_ACCESS_DENIED);
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return (!(*stat & 0x1) || pte_fault || spu->class_0_pending) ? 1 : 0;
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}
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static inline int spu_run_init(struct spu_context *ctx, u32 * npc,
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u32 * status)
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{
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int ret;
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ret = spu_acquire_runnable(ctx);
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if (ret)
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if ((ret = spu_acquire_runnable(ctx)) != 0)
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return ret;
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ctx->ops->npc_write(ctx, *npc);
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ctx->ops->runcntl_write(ctx, SPU_RUNCNTL_RUNNABLE);
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return 0;
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}
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static inline int spu_run_fini(struct spu_context *ctx, u32 * npc,
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u32 * status)
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{
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int ret = 0;
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*status = ctx->ops->status_read(ctx);
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*npc = ctx->ops->npc_read(ctx);
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spu_release(ctx);
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if (signal_pending(current))
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ret = -ERESTARTSYS;
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if (unlikely(current->ptrace & PT_PTRACED)) {
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if ((*status & SPU_STATUS_STOPPED_BY_STOP)
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&& (*status >> SPU_STOP_STATUS_SHIFT) == 0x3fff) {
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force_sig(SIGTRAP, current);
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ret = -ERESTARTSYS;
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}
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}
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return ret;
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}
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static inline int spu_reacquire_runnable(struct spu_context *ctx, u32 *npc,
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u32 *status)
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{
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int ret;
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if ((ret = spu_run_fini(ctx, npc, status)) != 0)
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return ret;
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if (*status & (SPU_STATUS_STOPPED_BY_STOP |
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SPU_STATUS_STOPPED_BY_HALT)) {
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return *status;
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}
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if ((ret = spu_run_init(ctx, npc, status)) != 0)
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return ret;
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return 0;
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}
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static inline int spu_process_events(struct spu_context *ctx)
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{
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struct spu *spu = ctx->spu;
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u64 pte_fault = MFC_DSISR_PTE_NOT_FOUND | MFC_DSISR_ACCESS_DENIED;
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int ret = 0;
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if (spu->dsisr & pte_fault)
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ret = spu_irq_class_1_bottom(spu);
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if (spu->class_0_pending)
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ret = spu_irq_class_0_bottom(spu);
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if (!ret && signal_pending(current))
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ret = -ERESTARTSYS;
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return ret;
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}
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long spufs_run_spu(struct file *file, struct spu_context *ctx,
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u32 * npc, u32 * status)
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{
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int ret;
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if ((ret = spu_run_init(ctx, npc, status)) != 0)
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return ret;
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ctx->ops->npc_write(ctx, *npc);
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do {
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ret = spufs_wait(ctx->stop_wq, spu_stopped(ctx, status));
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if (unlikely(ret))
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break;
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if (unlikely(ctx->state != SPU_STATE_RUNNABLE)) {
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ret = spu_reacquire_runnable(ctx, npc, status);
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if (ret) {
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return ret;
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}
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continue;
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}
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ret = spu_process_events(ctx);
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ret = spu_run(ctx->spu);
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} while (!ret && !(*status & (SPU_STATUS_STOPPED_BY_STOP |
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SPU_STATUS_STOPPED_BY_HALT)));
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ctx->ops->runcntl_stop(ctx);
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ret = spu_run_fini(ctx, npc, status);
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if (!ret)
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ret = ctx->ops->status_read(ctx);
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*npc = ctx->ops->npc_read(ctx);
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spu_release(ctx);
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ret = *status;
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spu_yield(ctx);
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return ret;
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}
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@ -186,6 +186,21 @@ static char *spu_hw_get_ls(struct spu_context *ctx)
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return ctx->spu->local_store;
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}
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static void spu_hw_runcntl_write(struct spu_context *ctx, u32 val)
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{
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eieio();
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out_be32(&ctx->spu->problem->spu_runcntl_RW, val);
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}
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static void spu_hw_runcntl_stop(struct spu_context *ctx)
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{
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spin_lock_irq(&ctx->spu->register_lock);
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out_be32(&ctx->spu->problem->spu_runcntl_RW, SPU_RUNCNTL_STOP);
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while (in_be32(&ctx->spu->problem->spu_status_R) & SPU_STATUS_RUNNING)
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cpu_relax();
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spin_unlock_irq(&ctx->spu->register_lock);
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}
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struct spu_context_ops spu_hw_ops = {
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.mbox_read = spu_hw_mbox_read,
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.mbox_stat_read = spu_hw_mbox_stat_read,
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@ -203,4 +218,6 @@ struct spu_context_ops spu_hw_ops = {
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.npc_write = spu_hw_npc_write,
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.status_read = spu_hw_status_read,
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.get_ls = spu_hw_get_ls,
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.runcntl_write = spu_hw_runcntl_write,
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.runcntl_stop = spu_hw_runcntl_stop,
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};
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@ -119,7 +119,8 @@ static void prio_wakeup(struct spu_runqueue *rq)
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}
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}
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static void prio_wait(struct spu_runqueue *rq, u64 flags)
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static void prio_wait(struct spu_runqueue *rq, struct spu_context *ctx,
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u64 flags)
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{
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int prio = current->prio;
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wait_queue_head_t *wq = &rq->prio.waitq[prio];
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@ -130,9 +131,11 @@ static void prio_wait(struct spu_runqueue *rq, u64 flags)
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prepare_to_wait_exclusive(wq, &wait, TASK_INTERRUPTIBLE);
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if (!signal_pending(current)) {
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up(&rq->sem);
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up_write(&ctx->state_sema);
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pr_debug("%s: pid=%d prio=%d\n", __FUNCTION__,
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current->pid, current->prio);
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schedule();
|
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down_write(&ctx->state_sema);
|
||||
down(&rq->sem);
|
||||
}
|
||||
finish_wait(wq, &wait);
|
||||
|
|
@ -173,7 +176,9 @@ static inline void bind_context(struct spu *spu, struct spu_context *ctx)
|
|||
mm_needs_global_tlbie(spu->mm);
|
||||
spu->ibox_callback = spufs_ibox_callback;
|
||||
spu->wbox_callback = spufs_wbox_callback;
|
||||
spu->stop_callback = spufs_stop_callback;
|
||||
mb();
|
||||
spu_unmap_mappings(ctx);
|
||||
spu_restore(&ctx->csa, spu);
|
||||
}
|
||||
|
||||
|
|
@ -181,10 +186,12 @@ static inline void unbind_context(struct spu *spu, struct spu_context *ctx)
|
|||
{
|
||||
pr_debug("%s: unbind pid=%d SPU=%d\n", __FUNCTION__,
|
||||
spu->pid, spu->number);
|
||||
spu_unmap_mappings(ctx);
|
||||
spu_save(&ctx->csa, spu);
|
||||
ctx->state = SPU_STATE_SAVED;
|
||||
spu->ibox_callback = NULL;
|
||||
spu->wbox_callback = NULL;
|
||||
spu->stop_callback = NULL;
|
||||
spu->mm = NULL;
|
||||
spu->pid = 0;
|
||||
spu->prio = MAX_PRIO;
|
||||
|
|
@ -196,37 +203,35 @@ static inline void unbind_context(struct spu *spu, struct spu_context *ctx)
|
|||
static struct spu *preempt_active(struct spu_runqueue *rq)
|
||||
{
|
||||
struct list_head *p;
|
||||
struct spu_context *ctx;
|
||||
struct spu *spu;
|
||||
struct spu *worst, *spu;
|
||||
|
||||
/* Future: implement real preemption. For now just
|
||||
* boot a lower priority ctx that is in "detached"
|
||||
* state, i.e. on a processor but not currently in
|
||||
* spu_run().
|
||||
*/
|
||||
worst = list_entry(rq->active_list.next, struct spu, sched_list);
|
||||
list_for_each(p, &rq->active_list) {
|
||||
spu = list_entry(p, struct spu, sched_list);
|
||||
if (current->prio < spu->prio) {
|
||||
ctx = spu->ctx;
|
||||
if (down_write_trylock(&ctx->state_sema)) {
|
||||
if (ctx->state != SPU_STATE_RUNNABLE) {
|
||||
up_write(&ctx->state_sema);
|
||||
continue;
|
||||
}
|
||||
pr_debug("%s: booting pid=%d from SPU %d\n",
|
||||
__FUNCTION__, spu->pid, spu->number);
|
||||
del_active(rq, spu);
|
||||
up(&rq->sem);
|
||||
unbind_context(spu, ctx);
|
||||
up_write(&ctx->state_sema);
|
||||
return spu;
|
||||
}
|
||||
if (spu->prio > worst->prio) {
|
||||
worst = spu;
|
||||
}
|
||||
}
|
||||
if (current->prio < worst->prio) {
|
||||
struct spu_context *ctx = worst->ctx;
|
||||
|
||||
spu = worst;
|
||||
if (down_write_trylock(&ctx->state_sema)) {
|
||||
pr_debug("%s: booting pid=%d from SPU %d\n",
|
||||
__FUNCTION__, spu->pid, spu->number);
|
||||
del_active(rq, spu);
|
||||
up(&rq->sem);
|
||||
wake_up_all(&ctx->stop_wq);
|
||||
ctx->ops->runcntl_stop(ctx);
|
||||
unbind_context(spu, ctx);
|
||||
up_write(&ctx->state_sema);
|
||||
return spu;
|
||||
}
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static struct spu *get_idle_spu(u64 flags)
|
||||
static struct spu *get_idle_spu(struct spu_context *ctx, u64 flags)
|
||||
{
|
||||
struct spu_runqueue *rq;
|
||||
struct spu *spu = NULL;
|
||||
|
|
@ -255,7 +260,7 @@ static struct spu *get_idle_spu(u64 flags)
|
|||
if ((spu = preempt_active(rq)) != NULL)
|
||||
return spu;
|
||||
}
|
||||
prio_wait(rq, flags);
|
||||
prio_wait(rq, ctx, flags);
|
||||
if (signal_pending(current)) {
|
||||
prio_wakeup(rq);
|
||||
spu = NULL;
|
||||
|
|
@ -322,7 +327,7 @@ int spu_activate(struct spu_context *ctx, u64 flags)
|
|||
|
||||
if (ctx->spu)
|
||||
return 0;
|
||||
spu = get_idle_spu(flags);
|
||||
spu = get_idle_spu(ctx, flags);
|
||||
if (!spu)
|
||||
return (signal_pending(current)) ? -ERESTARTSYS : -EAGAIN;
|
||||
bind_context(spu, ctx);
|
||||
|
|
@ -347,17 +352,19 @@ void spu_deactivate(struct spu_context *ctx)
|
|||
void spu_yield(struct spu_context *ctx)
|
||||
{
|
||||
struct spu *spu;
|
||||
int need_yield = 0;
|
||||
|
||||
if (!down_write_trylock(&ctx->state_sema))
|
||||
return;
|
||||
down_write(&ctx->state_sema);
|
||||
spu = ctx->spu;
|
||||
if ((ctx->state == SPU_STATE_RUNNABLE) &&
|
||||
(sched_find_first_bit(spu->rq->prio.bitmap) <= current->prio)) {
|
||||
if (spu && (sched_find_first_bit(spu->rq->prio.bitmap) < MAX_PRIO)) {
|
||||
pr_debug("%s: yielding SPU %d\n", __FUNCTION__, spu->number);
|
||||
spu_deactivate(ctx);
|
||||
ctx->state = SPU_STATE_SAVED;
|
||||
need_yield = 1;
|
||||
}
|
||||
up_write(&ctx->state_sema);
|
||||
if (unlikely(need_yield))
|
||||
yield();
|
||||
}
|
||||
|
||||
int __init spu_sched_init(void)
|
||||
|
|
|
|||
|
|
@ -51,6 +51,7 @@ struct spu_context {
|
|||
struct kref kref;
|
||||
wait_queue_head_t ibox_wq;
|
||||
wait_queue_head_t wbox_wq;
|
||||
wait_queue_head_t stop_wq;
|
||||
struct fasync_struct *ibox_fasync;
|
||||
struct fasync_struct *wbox_fasync;
|
||||
struct spu_context_ops *ops;
|
||||
|
|
@ -74,6 +75,8 @@ struct spu_context_ops {
|
|||
void (*npc_write) (struct spu_context * ctx, u32 data);
|
||||
u32(*status_read) (struct spu_context * ctx);
|
||||
char*(*get_ls) (struct spu_context * ctx);
|
||||
void (*runcntl_write) (struct spu_context * ctx, u32 data);
|
||||
void (*runcntl_stop) (struct spu_context * ctx);
|
||||
};
|
||||
|
||||
extern struct spu_context_ops spu_hw_ops;
|
||||
|
|
@ -99,6 +102,7 @@ struct spu_context * alloc_spu_context(struct address_space *local_store);
|
|||
void destroy_spu_context(struct kref *kref);
|
||||
struct spu_context * get_spu_context(struct spu_context *ctx);
|
||||
int put_spu_context(struct spu_context *ctx);
|
||||
void spu_unmap_mappings(struct spu_context *ctx);
|
||||
|
||||
void spu_forget(struct spu_context *ctx);
|
||||
void spu_acquire(struct spu_context *ctx);
|
||||
|
|
@ -118,5 +122,6 @@ size_t spu_ibox_read(struct spu_context *ctx, u32 *data);
|
|||
/* irq callback funcs. */
|
||||
void spufs_ibox_callback(struct spu *spu);
|
||||
void spufs_wbox_callback(struct spu *spu);
|
||||
void spufs_stop_callback(struct spu *spu);
|
||||
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -135,9 +135,9 @@ struct spu {
|
|||
spinlock_t register_lock;
|
||||
|
||||
u32 stop_code;
|
||||
wait_queue_head_t stop_wq;
|
||||
void (* wbox_callback)(struct spu *spu);
|
||||
void (* ibox_callback)(struct spu *spu);
|
||||
void (* stop_callback)(struct spu *spu);
|
||||
|
||||
char irq_c0[8];
|
||||
char irq_c1[8];
|
||||
|
|
@ -146,7 +146,8 @@ struct spu {
|
|||
|
||||
struct spu *spu_alloc(void);
|
||||
void spu_free(struct spu *spu);
|
||||
int spu_run(struct spu *spu);
|
||||
int spu_irq_class_0_bottom(struct spu *spu);
|
||||
int spu_irq_class_1_bottom(struct spu *spu);
|
||||
|
||||
extern struct spufs_calls {
|
||||
asmlinkage long (*create_thread)(const char __user *name,
|
||||
|
|
|
|||
Loading…
Reference in New Issue