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#include <linux/wait.h>
#include <linux/ptrace.h>
#include <asm/spu.h>
#include "spufs.h"
/* interrupt-level stop callback function. */
void spufs_stop_callback(struct spu *spu)
{
struct spu_context *ctx = spu->ctx;
wake_up_all(&ctx->stop_wq);
}
static inline int spu_stopped(struct spu_context *ctx, u32 * stat)
{
struct spu *spu;
u64 pte_fault;
*stat = ctx->ops->status_read(ctx);
if (ctx->state != SPU_STATE_RUNNABLE)
return 1;
spu = ctx->spu;
pte_fault = spu->dsisr &
(MFC_DSISR_PTE_NOT_FOUND | MFC_DSISR_ACCESS_DENIED);
return (!(*stat & 0x1) || pte_fault || spu->class_0_pending) ? 1 : 0;
}
static inline int spu_run_init(struct spu_context *ctx, u32 * npc,
u32 * status)
{
int ret;
if ((ret = spu_acquire_runnable(ctx)) != 0)
return ret;
ctx->ops->npc_write(ctx, *npc);
ctx->ops->runcntl_write(ctx, SPU_RUNCNTL_RUNNABLE);
return 0;
}
static inline int spu_run_fini(struct spu_context *ctx, u32 * npc,
u32 * status)
{
int ret = 0;
*status = ctx->ops->status_read(ctx);
*npc = ctx->ops->npc_read(ctx);
spu_release(ctx);
if (signal_pending(current))
ret = -ERESTARTSYS;
if (unlikely(current->ptrace & PT_PTRACED)) {
if ((*status & SPU_STATUS_STOPPED_BY_STOP)
&& (*status >> SPU_STOP_STATUS_SHIFT) == 0x3fff) {
force_sig(SIGTRAP, current);
ret = -ERESTARTSYS;
}
}
return ret;
}
static inline int spu_reacquire_runnable(struct spu_context *ctx, u32 *npc,
u32 *status)
{
int ret;
if ((ret = spu_run_fini(ctx, npc, status)) != 0)
return ret;
if (*status & (SPU_STATUS_STOPPED_BY_STOP |
SPU_STATUS_STOPPED_BY_HALT)) {
return *status;
}
if ((ret = spu_run_init(ctx, npc, status)) != 0)
return ret;
return 0;
}
static inline int spu_process_events(struct spu_context *ctx)
{
struct spu *spu = ctx->spu;
u64 pte_fault = MFC_DSISR_PTE_NOT_FOUND | MFC_DSISR_ACCESS_DENIED;
int ret = 0;
if (spu->dsisr & pte_fault)
ret = spu_irq_class_1_bottom(spu);
if (spu->class_0_pending)
ret = spu_irq_class_0_bottom(spu);
if (!ret && signal_pending(current))
ret = -ERESTARTSYS;
return ret;
}
long spufs_run_spu(struct file *file, struct spu_context *ctx,
u32 * npc, u32 * status)
{
int ret;
if (down_interruptible(&ctx->run_sema))
return -ERESTARTSYS;
ret = spu_run_init(ctx, npc, status);
if (ret)
goto out;
do {
ret = spufs_wait(ctx->stop_wq, spu_stopped(ctx, status));
if (unlikely(ret))
break;
if (unlikely(ctx->state != SPU_STATE_RUNNABLE)) {
ret = spu_reacquire_runnable(ctx, npc, status);
if (ret)
goto out;
continue;
}
ret = spu_process_events(ctx);
} while (!ret && !(*status & (SPU_STATUS_STOPPED_BY_STOP |
SPU_STATUS_STOPPED_BY_HALT)));
ctx->ops->runcntl_stop(ctx);
ret = spu_run_fini(ctx, npc, status);
if (!ret)
ret = *status;
spu_yield(ctx);
out:
up(&ctx->run_sema);
return ret;
}
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