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

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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: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2013-05-13 21:13:15 +10:00
parent 464d636bd0
commit ca97a36698
2 changed files with 4 additions and 10 deletions
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7
drivers/gpu/drm/nouveau/core/subdev/vm/nv50.c
View File

@ -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;
}

7
drivers/gpu/drm/nouveau/core/subdev/vm/nvc0.c
View File

@ -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;
}