452 lines
11 KiB
C
452 lines
11 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#define DEBUG
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#include <linux/wait.h>
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#include <linux/ptrace.h>
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#include <asm/spu.h>
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#include <asm/spu_priv1.h>
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#include <asm/io.h>
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#include <asm/unistd.h>
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#include "spufs.h"
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/* interrupt-level stop callback function. */
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void spufs_stop_callback(struct spu *spu, int irq)
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{
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struct spu_context *ctx = spu->ctx;
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/*
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* It should be impossible to preempt a context while an exception
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* is being processed, since the context switch code is specially
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* coded to deal with interrupts ... But, just in case, sanity check
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* the context pointer. It is OK to return doing nothing since
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* the exception will be regenerated when the context is resumed.
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*/
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if (ctx) {
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/* Copy exception arguments into module specific structure */
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switch(irq) {
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case 0 :
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ctx->csa.class_0_pending = spu->class_0_pending;
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ctx->csa.class_0_dar = spu->class_0_dar;
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break;
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case 1 :
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ctx->csa.class_1_dsisr = spu->class_1_dsisr;
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ctx->csa.class_1_dar = spu->class_1_dar;
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break;
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case 2 :
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break;
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}
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/* ensure that the exception status has hit memory before a
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* thread waiting on the context's stop queue is woken */
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smp_wmb();
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wake_up_all(&ctx->stop_wq);
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}
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}
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int spu_stopped(struct spu_context *ctx, u32 *stat)
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{
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u64 dsisr;
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u32 stopped;
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stopped = SPU_STATUS_INVALID_INSTR | SPU_STATUS_SINGLE_STEP |
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SPU_STATUS_STOPPED_BY_HALT | SPU_STATUS_STOPPED_BY_STOP;
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top:
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*stat = ctx->ops->status_read(ctx);
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if (*stat & stopped) {
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/*
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* If the spu hasn't finished stopping, we need to
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* re-read the register to get the stopped value.
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*/
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if (*stat & SPU_STATUS_RUNNING)
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goto top;
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return 1;
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}
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if (test_bit(SPU_SCHED_NOTIFY_ACTIVE, &ctx->sched_flags))
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return 1;
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dsisr = ctx->csa.class_1_dsisr;
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if (dsisr & (MFC_DSISR_PTE_NOT_FOUND | MFC_DSISR_ACCESS_DENIED))
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return 1;
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if (ctx->csa.class_0_pending)
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return 1;
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return 0;
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}
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static int spu_setup_isolated(struct spu_context *ctx)
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{
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int ret;
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u64 __iomem *mfc_cntl;
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u64 sr1;
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u32 status;
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unsigned long timeout;
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const u32 status_loading = SPU_STATUS_RUNNING
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| SPU_STATUS_ISOLATED_STATE | SPU_STATUS_ISOLATED_LOAD_STATUS;
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ret = -ENODEV;
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if (!isolated_loader)
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goto out;
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/*
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* We need to exclude userspace access to the context.
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*
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* To protect against memory access we invalidate all ptes
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* and make sure the pagefault handlers block on the mutex.
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*/
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spu_unmap_mappings(ctx);
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mfc_cntl = &ctx->spu->priv2->mfc_control_RW;
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/* purge the MFC DMA queue to ensure no spurious accesses before we
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* enter kernel mode */
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timeout = jiffies + HZ;
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out_be64(mfc_cntl, MFC_CNTL_PURGE_DMA_REQUEST);
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while ((in_be64(mfc_cntl) & MFC_CNTL_PURGE_DMA_STATUS_MASK)
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!= MFC_CNTL_PURGE_DMA_COMPLETE) {
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if (time_after(jiffies, timeout)) {
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printk(KERN_ERR "%s: timeout flushing MFC DMA queue\n",
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__func__);
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ret = -EIO;
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goto out;
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}
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cond_resched();
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}
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/* clear purge status */
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out_be64(mfc_cntl, 0);
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/* put the SPE in kernel mode to allow access to the loader */
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sr1 = spu_mfc_sr1_get(ctx->spu);
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sr1 &= ~MFC_STATE1_PROBLEM_STATE_MASK;
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spu_mfc_sr1_set(ctx->spu, sr1);
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/* start the loader */
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ctx->ops->signal1_write(ctx, (unsigned long)isolated_loader >> 32);
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ctx->ops->signal2_write(ctx,
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(unsigned long)isolated_loader & 0xffffffff);
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ctx->ops->runcntl_write(ctx,
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SPU_RUNCNTL_RUNNABLE | SPU_RUNCNTL_ISOLATE);
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ret = 0;
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timeout = jiffies + HZ;
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while (((status = ctx->ops->status_read(ctx)) & status_loading) ==
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status_loading) {
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if (time_after(jiffies, timeout)) {
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printk(KERN_ERR "%s: timeout waiting for loader\n",
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__func__);
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ret = -EIO;
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goto out_drop_priv;
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}
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cond_resched();
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}
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if (!(status & SPU_STATUS_RUNNING)) {
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/* If isolated LOAD has failed: run SPU, we will get a stop-and
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* signal later. */
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pr_debug("%s: isolated LOAD failed\n", __func__);
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ctx->ops->runcntl_write(ctx, SPU_RUNCNTL_RUNNABLE);
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ret = -EACCES;
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goto out_drop_priv;
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}
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if (!(status & SPU_STATUS_ISOLATED_STATE)) {
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/* This isn't allowed by the CBEA, but check anyway */
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pr_debug("%s: SPU fell out of isolated mode?\n", __func__);
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ctx->ops->runcntl_write(ctx, SPU_RUNCNTL_STOP);
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ret = -EINVAL;
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goto out_drop_priv;
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}
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out_drop_priv:
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/* Finished accessing the loader. Drop kernel mode */
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sr1 |= MFC_STATE1_PROBLEM_STATE_MASK;
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spu_mfc_sr1_set(ctx->spu, sr1);
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out:
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return ret;
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}
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static int spu_run_init(struct spu_context *ctx, u32 *npc)
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{
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unsigned long runcntl = SPU_RUNCNTL_RUNNABLE;
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int ret;
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spuctx_switch_state(ctx, SPU_UTIL_SYSTEM);
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/*
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* NOSCHED is synchronous scheduling with respect to the caller.
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* The caller waits for the context to be loaded.
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*/
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if (ctx->flags & SPU_CREATE_NOSCHED) {
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if (ctx->state == SPU_STATE_SAVED) {
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ret = spu_activate(ctx, 0);
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if (ret)
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return ret;
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}
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}
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/*
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* Apply special setup as required.
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*/
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if (ctx->flags & SPU_CREATE_ISOLATE) {
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if (!(ctx->ops->status_read(ctx) & SPU_STATUS_ISOLATED_STATE)) {
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ret = spu_setup_isolated(ctx);
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if (ret)
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return ret;
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}
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/*
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* If userspace has set the runcntrl register (eg, to
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* issue an isolated exit), we need to re-set it here
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*/
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runcntl = ctx->ops->runcntl_read(ctx) &
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(SPU_RUNCNTL_RUNNABLE | SPU_RUNCNTL_ISOLATE);
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if (runcntl == 0)
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runcntl = SPU_RUNCNTL_RUNNABLE;
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} else {
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unsigned long privcntl;
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if (test_thread_flag(TIF_SINGLESTEP))
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privcntl = SPU_PRIVCNTL_MODE_SINGLE_STEP;
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else
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privcntl = SPU_PRIVCNTL_MODE_NORMAL;
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ctx->ops->privcntl_write(ctx, privcntl);
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ctx->ops->npc_write(ctx, *npc);
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}
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ctx->ops->runcntl_write(ctx, runcntl);
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if (ctx->flags & SPU_CREATE_NOSCHED) {
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spuctx_switch_state(ctx, SPU_UTIL_USER);
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} else {
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if (ctx->state == SPU_STATE_SAVED) {
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ret = spu_activate(ctx, 0);
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if (ret)
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return ret;
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} else {
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spuctx_switch_state(ctx, SPU_UTIL_USER);
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}
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}
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set_bit(SPU_SCHED_SPU_RUN, &ctx->sched_flags);
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return 0;
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}
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static 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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spu_del_from_rq(ctx);
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*status = ctx->ops->status_read(ctx);
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*npc = ctx->ops->npc_read(ctx);
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spuctx_switch_state(ctx, SPU_UTIL_IDLE_LOADED);
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clear_bit(SPU_SCHED_SPU_RUN, &ctx->sched_flags);
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spu_switch_log_notify(NULL, ctx, SWITCH_LOG_EXIT, *status);
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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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return ret;
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}
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/*
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* SPU syscall restarting is tricky because we violate the basic
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* assumption that the signal handler is running on the interrupted
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* thread. Here instead, the handler runs on PowerPC user space code,
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* while the syscall was called from the SPU.
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* This means we can only do a very rough approximation of POSIX
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* signal semantics.
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*/
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static int spu_handle_restartsys(struct spu_context *ctx, long *spu_ret,
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unsigned int *npc)
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{
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int ret;
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switch (*spu_ret) {
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case -ERESTARTSYS:
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case -ERESTARTNOINTR:
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/*
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* Enter the regular syscall restarting for
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* sys_spu_run, then restart the SPU syscall
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* callback.
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*/
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*npc -= 8;
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ret = -ERESTARTSYS;
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break;
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case -ERESTARTNOHAND:
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case -ERESTART_RESTARTBLOCK:
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/*
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* Restart block is too hard for now, just return -EINTR
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* to the SPU.
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* ERESTARTNOHAND comes from sys_pause, we also return
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* -EINTR from there.
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* Assume that we need to be restarted ourselves though.
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*/
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*spu_ret = -EINTR;
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ret = -ERESTARTSYS;
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break;
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default:
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printk(KERN_WARNING "%s: unexpected return code %ld\n",
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__func__, *spu_ret);
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ret = 0;
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}
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return ret;
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}
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static int spu_process_callback(struct spu_context *ctx)
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{
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struct spu_syscall_block s;
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u32 ls_pointer, npc;
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void __iomem *ls;
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long spu_ret;
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int ret;
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/* get syscall block from local store */
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npc = ctx->ops->npc_read(ctx) & ~3;
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ls = (void __iomem *)ctx->ops->get_ls(ctx);
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ls_pointer = in_be32(ls + npc);
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if (ls_pointer > (LS_SIZE - sizeof(s)))
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return -EFAULT;
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memcpy_fromio(&s, ls + ls_pointer, sizeof(s));
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/* do actual syscall without pinning the spu */
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ret = 0;
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spu_ret = -ENOSYS;
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npc += 4;
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if (s.nr_ret < NR_syscalls) {
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spu_release(ctx);
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/* do actual system call from here */
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spu_ret = spu_sys_callback(&s);
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if (spu_ret <= -ERESTARTSYS) {
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ret = spu_handle_restartsys(ctx, &spu_ret, &npc);
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}
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mutex_lock(&ctx->state_mutex);
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if (ret == -ERESTARTSYS)
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return ret;
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}
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/* need to re-get the ls, as it may have changed when we released the
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* spu */
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ls = (void __iomem *)ctx->ops->get_ls(ctx);
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/* write result, jump over indirect pointer */
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memcpy_toio(ls + ls_pointer, &spu_ret, sizeof(spu_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 ret;
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}
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long spufs_run_spu(struct spu_context *ctx, u32 *npc, u32 *event)
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{
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int ret;
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u32 status;
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if (mutex_lock_interruptible(&ctx->run_mutex))
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return -ERESTARTSYS;
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ctx->event_return = 0;
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ret = spu_acquire(ctx);
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if (ret)
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goto out_unlock;
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spu_enable_spu(ctx);
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spu_update_sched_info(ctx);
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ret = spu_run_init(ctx, npc);
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if (ret) {
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spu_release(ctx);
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goto out;
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}
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do {
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ret = spufs_wait(ctx->stop_wq, spu_stopped(ctx, &status));
|
||
|
|
if (unlikely(ret)) {
|
||
|
|
/*
|
||
|
|
* This is nasty: we need the state_mutex for all the
|
||
|
|
* bookkeeping even if the syscall was interrupted by
|
||
|
|
* a signal. ewww.
|
||
|
|
*/
|
||
|
|
mutex_lock(&ctx->state_mutex);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if (unlikely(test_and_clear_bit(SPU_SCHED_NOTIFY_ACTIVE,
|
||
|
|
&ctx->sched_flags))) {
|
||
|
|
if (!(status & SPU_STATUS_STOPPED_BY_STOP))
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
spuctx_switch_state(ctx, SPU_UTIL_SYSTEM);
|
||
|
|
|
||
|
|
if ((status & SPU_STATUS_STOPPED_BY_STOP) &&
|
||
|
|
(status >> SPU_STOP_STATUS_SHIFT == 0x2104)) {
|
||
|
|
ret = spu_process_callback(ctx);
|
||
|
|
if (ret)
|
||
|
|
break;
|
||
|
|
status &= ~SPU_STATUS_STOPPED_BY_STOP;
|
||
|
|
}
|
||
|
|
ret = spufs_handle_class1(ctx);
|
||
|
|
if (ret)
|
||
|
|
break;
|
||
|
|
|
||
|
|
ret = spufs_handle_class0(ctx);
|
||
|
|
if (ret)
|
||
|
|
break;
|
||
|
|
|
||
|
|
if (signal_pending(current))
|
||
|
|
ret = -ERESTARTSYS;
|
||
|
|
} while (!ret && !(status & (SPU_STATUS_STOPPED_BY_STOP |
|
||
|
|
SPU_STATUS_STOPPED_BY_HALT |
|
||
|
|
SPU_STATUS_SINGLE_STEP)));
|
||
|
|
|
||
|
|
spu_disable_spu(ctx);
|
||
|
|
ret = spu_run_fini(ctx, npc, &status);
|
||
|
|
spu_yield(ctx);
|
||
|
|
|
||
|
|
if ((status & SPU_STATUS_STOPPED_BY_STOP) &&
|
||
|
|
(((status >> SPU_STOP_STATUS_SHIFT) & 0x3f00) == 0x2100))
|
||
|
|
ctx->stats.libassist++;
|
||
|
|
|
||
|
|
if ((ret == 0) ||
|
||
|
|
((ret == -ERESTARTSYS) &&
|
||
|
|
((status & SPU_STATUS_STOPPED_BY_HALT) ||
|
||
|
|
(status & SPU_STATUS_SINGLE_STEP) ||
|
||
|
|
((status & SPU_STATUS_STOPPED_BY_STOP) &&
|
||
|
|
(status >> SPU_STOP_STATUS_SHIFT != 0x2104)))))
|
||
|
|
ret = status;
|
||
|
|
|
||
|
|
/* Note: we don't need to force_sig SIGTRAP on single-step
|
||
|
|
* since we have TIF_SINGLESTEP set, thus the kernel will do
|
||
|
|
* it upon return from the syscall anyway.
|
||
|
|
*/
|
||
|
|
if (unlikely(status & SPU_STATUS_SINGLE_STEP))
|
||
|
|
ret = -ERESTARTSYS;
|
||
|
|
|
||
|
|
else if (unlikely((status & SPU_STATUS_STOPPED_BY_STOP)
|
||
|
|
&& (status >> SPU_STOP_STATUS_SHIFT) == 0x3fff)) {
|
||
|
|
force_sig(SIGTRAP);
|
||
|
|
ret = -ERESTARTSYS;
|
||
|
|
}
|
||
|
|
|
||
|
|
out:
|
||
|
|
*event = ctx->event_return;
|
||
|
|
out_unlock:
|
||
|
|
mutex_unlock(&ctx->run_mutex);
|
||
|
|
return ret;
|
||
|
|
}
|