[POWERPC] spufs: streamline locking for isolated spu setup

For quite a while now spu state is protected by a simple mutex instead
of the old rw_semaphore, and this means we can simplify the locking
around spu_setup_isolated a lot.

Instead of doing an spu_release before entering spu_setup_isolated and
then calling the complicated spu_acquire_exclusive we can now simply
enter the function locked an in guaranteed runnable state, so that the
only bit of spu_acquire_exclusive that's left is the call to
spu_unmap_mappings.

Similarly there's no more need to unlock and reacquire the state_mutex
when spu_setup_isolated is done, but we can always return with the
lock held and only drop it in spu_run_init in the failure case.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

arch/powerpc/platforms/cell/spufs/context.c

@@ -121,46 +121,6 @@ void spu_unmap_mappings(struct spu_context *ctx)
 		unmap_mapping_range(ctx->psmap, 0, 0x20000, 1);
 }
 
-/**
- * spu_acquire_exclusive - lock spu contex and protect against userspace access
- * @ctx:	spu contex to lock
- *
- * Note:
- *	Returns 0 and with the context locked on success
- *	Returns negative error and with the context _unlocked_ on failure.
- */
-int spu_acquire_exclusive(struct spu_context *ctx)
-{
-	int ret = -EINVAL;
-
-	spu_acquire(ctx);
-	/*
-	 * Context is about to be freed, so we can't acquire it anymore.
-	 */
-	if (!ctx->owner)
-		goto out_unlock;
-
-	if (ctx->state == SPU_STATE_SAVED) {
-		ret = spu_activate(ctx, 0);
-		if (ret)
-			goto out_unlock;
-	} else {
-		/*
-		 * We need to exclude userspace access to the context.
-		 *
-		 * To protect against memory access we invalidate all ptes
-		 * and make sure the pagefault handlers block on the mutex.
-		 */
-		spu_unmap_mappings(ctx);
-	}
-
-	return 0;
-
- out_unlock:
-	spu_release(ctx);
-	return ret;
-}
-
 /**
  * spu_acquire_runnable - lock spu contex and make sure it is in runnable state
  * @ctx:	spu contex to lock

arch/powerpc/platforms/cell/spufs/run.c

@@ -63,13 +63,18 @@ static int spu_setup_isolated(struct spu_context *ctx)
 	const u32 status_loading = SPU_STATUS_RUNNING
 		| SPU_STATUS_ISOLATED_STATE | SPU_STATUS_ISOLATED_LOAD_STATUS;
 
+	ret = -ENODEV;
 	if (!isolated_loader)
-		return -ENODEV;
-
-	ret = spu_acquire_exclusive(ctx);
-	if (ret)
 		goto out;
 
+	/*
+	 * We need to exclude userspace access to the context.
+	 *
+	 * To protect against memory access we invalidate all ptes
+	 * and make sure the pagefault handlers block on the mutex.
+	 */
+	spu_unmap_mappings(ctx);
+
 	mfc_cntl = &ctx->spu->priv2->mfc_control_RW;
 
 	/* purge the MFC DMA queue to ensure no spurious accesses before we
@@ -82,7 +87,7 @@ static int spu_setup_isolated(struct spu_context *ctx)
 			printk(KERN_ERR "%s: timeout flushing MFC DMA queue\n",
 					__FUNCTION__);
 			ret = -EIO;
-			goto out_unlock;
+			goto out;
 		}
 		cond_resched();
 	}
@@ -119,21 +124,22 @@ static int spu_setup_isolated(struct spu_context *ctx)
 		pr_debug("%s: isolated LOAD failed\n", __FUNCTION__);
 		ctx->ops->runcntl_write(ctx, SPU_RUNCNTL_RUNNABLE);
 		ret = -EACCES;
+		goto out_drop_priv;
+	}
 
-	} else if (!(status & SPU_STATUS_ISOLATED_STATE)) {
+	if (!(status & SPU_STATUS_ISOLATED_STATE)) {
 		/* This isn't allowed by the CBEA, but check anyway */
 		pr_debug("%s: SPU fell out of isolated mode?\n", __FUNCTION__);
 		ctx->ops->runcntl_write(ctx, SPU_RUNCNTL_STOP);
 		ret = -EINVAL;
+		goto out_drop_priv;
 	}
 
 out_drop_priv:
 	/* Finished accessing the loader. Drop kernel mode */
 	sr1 |= MFC_STATE1_PROBLEM_STATE_MASK;
 	spu_mfc_sr1_set(ctx->spu, sr1);
 
-out_unlock:
-	spu_release(ctx);
 out:
 	return ret;
 }
@@ -149,13 +155,9 @@ static inline int spu_run_init(struct spu_context *ctx, u32 * npc)
 
 	if (ctx->flags & SPU_CREATE_ISOLATE) {
 		if (!(ctx->ops->status_read(ctx) & SPU_STATUS_ISOLATED_STATE)) {
-			/* Need to release ctx, because spu_setup_isolated will
-			 * acquire it exclusively.
-			 */
-			spu_release(ctx);
 			ret = spu_setup_isolated(ctx);
-			if (!ret)
-				ret = spu_acquire_runnable(ctx, 0);
+			if (ret)
+				spu_release(ctx);
 		}
 
 		/* if userspace has set the runcntrl register (eg, to issue an

arch/powerpc/platforms/cell/spufs/spufs.h

@@ -192,7 +192,6 @@ void spu_unmap_mappings(struct spu_context *ctx);
 void spu_forget(struct spu_context *ctx);
 int spu_acquire_runnable(struct spu_context *ctx, unsigned long flags);
 void spu_acquire_saved(struct spu_context *ctx);
-int spu_acquire_exclusive(struct spu_context *ctx);
 
 int spu_activate(struct spu_context *ctx, unsigned long flags);
 void spu_deactivate(struct spu_context *ctx);