1 files changed, 35 insertions, 10 deletions

diff --git a/arch/powerpc/platforms/cell/spufs/run.c b/arch/powerpc/platforms/cell/spufs/run.c
index 57626600b1a4..58ae13b7de84 100644
--- a/arch/powerpc/platforms/cell/spufs/run.c
+++ b/arch/powerpc/platforms/cell/spufs/run.c
@@ -29,7 +29,8 @@ static inline int spu_stopped(struct spu_context *ctx, u32 * stat)
 	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;
+	return (!(*stat & SPU_STATUS_RUNNING) || pte_fault || spu->class_0_pending) ?
+		1 : 0;
 }
 
 static int spu_setup_isolated(struct spu_context *ctx)
@@ -142,8 +143,11 @@ static int spu_run_init(struct spu_context *ctx, u32 * npc)
 			runcntl = SPU_RUNCNTL_RUNNABLE;
 		ctx->ops->runcntl_write(ctx, runcntl);
 	} else {
-		spu_start_tick(ctx);
+		unsigned long mode = SPU_PRIVCNTL_MODE_NORMAL;
 		ctx->ops->npc_write(ctx, *npc);
+		if (test_thread_flag(TIF_SINGLESTEP))
+			mode = SPU_PRIVCNTL_MODE_SINGLE_STEP;
+		out_be64(&ctx->spu->priv2->spu_privcntl_RW, mode);
 		ctx->ops->runcntl_write(ctx, SPU_RUNCNTL_RUNNABLE);
 	}
 
@@ -155,7 +159,6 @@ static int spu_run_fini(struct spu_context *ctx, u32 * npc,
 {
 	int ret = 0;
 
-	spu_stop_tick(ctx);
 	*status = ctx->ops->status_read(ctx);
 	*npc = ctx->ops->npc_read(ctx);
 	spu_release(ctx);
@@ -298,9 +301,22 @@ long spufs_run_spu(struct file *file, struct spu_context *ctx,
 	ctx->ops->master_start(ctx);
 	ctx->event_return = 0;
 
-	ret = spu_acquire_runnable(ctx, 0);
-	if (ret)
-		return ret;
+	spu_acquire(ctx);
+	if (ctx->state == SPU_STATE_SAVED) {
+		__spu_update_sched_info(ctx);
+
+		ret = spu_activate(ctx, 0);
+		if (ret) {
+			spu_release(ctx);
+			goto out;
+		}
+	} else {
+		/*
+		 * We have to update the scheduling priority under active_mutex
+		 * to protect against find_victim().
+		 */
+		spu_update_sched_info(ctx);
+	}
 
 	ret = spu_run_init(ctx, npc);
 	if (ret) {
@@ -325,16 +341,20 @@ long spufs_run_spu(struct file *file, struct spu_context *ctx,
 
 		if (unlikely(ctx->state != SPU_STATE_RUNNABLE)) {
 			ret = spu_reacquire_runnable(ctx, npc, &status);
-			if (ret) {
-				spu_stop_tick(ctx);
+			if (ret)
 				goto out2;
-			}
 			continue;
 		}
 		ret = spu_process_events(ctx);
 
 	} while (!ret && !(status & (SPU_STATUS_STOPPED_BY_STOP |
-				      SPU_STATUS_STOPPED_BY_HALT)));
+				      SPU_STATUS_STOPPED_BY_HALT |
+				       SPU_STATUS_SINGLE_STEP)));
+
+	if ((status & SPU_STATUS_STOPPED_BY_STOP) &&
+	    (((status >> SPU_STOP_STATUS_SHIFT) & 0x3f00) == 0x2100) &&
+	    (ctx->state == SPU_STATE_RUNNABLE))
+		ctx->stats.libassist++;
 
 	ctx->ops->master_stop(ctx);
 	ret = spu_run_fini(ctx, npc, &status);
@@ -344,10 +364,15 @@ out2:
 	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 anyawy
+	 */
 	if ((status & SPU_STATUS_STOPPED_BY_STOP)
 	    && (status >> SPU_STOP_STATUS_SHIFT) == 0x3fff) {
 		force_sig(SIGTRAP, current);