Commit ca97a366 authored by Ben Skeggs's avatar Ben Skeggs
Browse files

drm/nv50-/vm: take mutex rather than irqsave spinlock 



These operations can take quite some time, and we really don't want to
have to hold a spinlock for too long.

Now that the lock ordering for vm and the gr/nv84 hw bug workaround has
been reversed, it's possible to use a mutex here.

Signed-off-by: default avatarBen Skeggs <bskeggs@redhat.com>
parent 464d636b

drivers/gpu/drm/nouveau/core/subdev/vm/nv50.c

+2 −5
Original line number Diff line number Diff line
@@ -31,7 +31,6 @@ 


struct nv50_vmmgr_priv {

	struct nouveau_vmmgr base;

	spinlock_t lock;

};



static void
@@ -153,10 +152,9 @@ nv50_vm_flush(struct nouveau_vm *vm) 
{

	struct nv50_vmmgr_priv *priv = (void *)vm->vmm;

	struct nouveau_engine *engine;

	unsigned long flags;

	int i, vme;



	spin_lock_irqsave(&priv->lock, flags);

	mutex_lock(&nv_subdev(priv)->mutex);

	for (i = 0; i < NVDEV_SUBDEV_NR; i++) {

		if (!atomic_read(&vm->engref[i]))

			continue;
@@ -182,7 +180,7 @@ nv50_vm_flush(struct nouveau_vm *vm) 
		if (!nv_wait(priv, 0x100c80, 0x00000001, 0x00000000))

			nv_error(priv, "vm flush timeout: engine %d\n", vme);

	}

	spin_unlock_irqrestore(&priv->lock, flags);

	mutex_unlock(&nv_subdev(priv)->mutex);

}



static int
@@ -220,7 +218,6 @@ nv50_vmmgr_ctor(struct nouveau_object *parent, struct nouveau_object *engine, 
	priv->base.map_sg = nv50_vm_map_sg;

	priv->base.unmap = nv50_vm_unmap;

	priv->base.flush = nv50_vm_flush;

	spin_lock_init(&priv->lock);

	return 0;

}

drivers/gpu/drm/nouveau/core/subdev/vm/nvc0.c

+2 −5
Original line number Diff line number Diff line
@@ -32,7 +32,6 @@ 


struct nvc0_vmmgr_priv {

	struct nouveau_vmmgr base;

	spinlock_t lock;

};
@@ -164,12 +163,11 @@ void 
nvc0_vm_flush_engine(struct nouveau_subdev *subdev, u64 addr, int type)

{

	struct nvc0_vmmgr_priv *priv = (void *)nouveau_vmmgr(subdev);

	unsigned long flags;



	/* looks like maybe a "free flush slots" counter, the

	 * faster you write to 0x100cbc to more it decreases

	 */

	spin_lock_irqsave(&priv->lock, flags);

	mutex_lock(&nv_subdev(priv)->mutex);

	if (!nv_wait_ne(subdev, 0x100c80, 0x00ff0000, 0x00000000)) {

		nv_error(subdev, "vm timeout 0: 0x%08x %d\n",

			 nv_rd32(subdev, 0x100c80), type);
@@ -183,7 +181,7 @@ nvc0_vm_flush_engine(struct nouveau_subdev *subdev, u64 addr, int type) 
		nv_error(subdev, "vm timeout 1: 0x%08x %d\n",

			 nv_rd32(subdev, 0x100c80), type);

	}

	spin_unlock_irqrestore(&priv->lock, flags);

	mutex_unlock(&nv_subdev(priv)->mutex);

}



static void
@@ -227,7 +225,6 @@ nvc0_vmmgr_ctor(struct nouveau_object *parent, struct nouveau_object *engine, 
	priv->base.map_sg = nvc0_vm_map_sg;

	priv->base.unmap = nvc0_vm_unmap;

	priv->base.flush = nvc0_vm_flush;

	spin_lock_init(&priv->lock);

	return 0;

}

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