ce8ab85412
The logic for sys_spu_run keeps growing and it does not really belong into file.c any more since we moved away from using regular file operations to our own syscall. No functional change in here. Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
131 lines
2.8 KiB
C
131 lines
2.8 KiB
C
#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 "spufs.h"
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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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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 (down_interruptible(&ctx->run_sema))
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return -ERESTARTSYS;
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ret = spu_run_init(ctx, npc, status);
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if (ret)
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goto out;
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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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goto out;
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continue;
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}
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ret = spu_process_events(ctx);
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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 = *status;
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spu_yield(ctx);
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out:
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up(&ctx->run_sema);
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return ret;
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}
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