swiotlb: fix the check whether a device has used software IO TLB

When CONFIG_SWIOTLB_DYNAMIC=y, devices which do not use the software IO TLB
can avoid swiotlb lookup. A flag is added by commit 1395706a1490 ("swiotlb:
search the software IO TLB only if the device makes use of it"), the flag
is correctly set, but it is then never checked. Add the actual check here.

Note that this code is an alternative to the default pool check, not an
additional check, because:

1. swiotlb_find_pool() also searches the default pool;
2. if dma_uses_io_tlb is false, the default swiotlb pool is not used.

Tested in a KVM guest against a QEMU RAM-backed SATA disk over virtio and
*not* using software IO TLB, this patch increases IOPS by approx 2% for
4-way parallel I/O.

The write memory barrier in swiotlb_dyn_alloc() is not needed, because a
newly allocated pool must always be observed by swiotlb_find_slots() before
an address from that pool is passed to is_swiotlb_buffer().

Correctness was verified using the following litmus test:

C swiotlb-new-pool

(*
 * Result: Never
 *
 * Check that a newly allocated pool is always visible when the
 *  corresponding swiotlb buffer is visible.
 *)

{
	mem_pools = default;
}

P0(int **mem_pools, int *pool)
{
	/* add_mem_pool() */
	WRITE_ONCE(*pool, 999);
	rcu_assign_pointer(*mem_pools, pool);
}

P1(int **mem_pools, int *flag, int *buf)
{
	/* swiotlb_find_slots() */
	int *r0;
	int r1;

	rcu_read_lock();
	r0 = READ_ONCE(*mem_pools);
	r1 = READ_ONCE(*r0);
	rcu_read_unlock();

	if (r1) {
		WRITE_ONCE(*flag, 1);
		smp_mb();
	}

	/* device driver (presumed) */
	WRITE_ONCE(*buf, r1);
}

P2(int **mem_pools, int *flag, int *buf)
{
	/* device driver (presumed) */
	int r0 = READ_ONCE(*buf);

	/* is_swiotlb_buffer() */
	int r1;
	int *r2;
	int r3;

	smp_rmb();
	r1 = READ_ONCE(*flag);
	if (r1) {
		/* swiotlb_find_pool() */
		rcu_read_lock();
		r2 = READ_ONCE(*mem_pools);
		r3 = READ_ONCE(*r2);
		rcu_read_unlock();
	}
}

exists (2:r0<>0 /\ 2:r3=0) (* Not found. *)

Fixes: 1395706a1490 ("swiotlb: search the software IO TLB only if the device makes use of it")
Reported-by: Jonathan Corbet <corbet@lwn.net>
Closes: https://lore.kernel.org/linux-iommu/87a5uz3ob8.fsf@meer.lwn.net/
Signed-off-by: Petr Tesarik <petr@tesarici.cz>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 20 insertions, 6 deletions

diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 85dd94323b98..01637677736f 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -728,9 +728,6 @@ static void swiotlb_dyn_alloc(struct work_struct *work)
 	}
 
 	add_mem_pool(mem, pool);
-
-	/* Pairs with smp_rmb() in is_swiotlb_buffer(). */
-	smp_wmb();
 }
 
 /**
@@ -1151,9 +1148,26 @@ static int swiotlb_find_slots(struct device *dev, phys_addr_t orig_addr,
 	spin_unlock_irqrestore(&dev->dma_io_tlb_lock, flags);
 
 found:
-	dev->dma_uses_io_tlb = true;
-	/* Pairs with smp_rmb() in is_swiotlb_buffer() */
-	smp_wmb();
+	WRITE_ONCE(dev->dma_uses_io_tlb, true);
+
+	/*
+	 * The general barrier orders reads and writes against a presumed store
+	 * of the SWIOTLB buffer address by a device driver (to a driver private
+	 * data structure). It serves two purposes.
+	 *
+	 * First, the store to dev->dma_uses_io_tlb must be ordered before the
+	 * presumed store. This guarantees that the returned buffer address
+	 * cannot be passed to another CPU before updating dev->dma_uses_io_tlb.
+	 *
+	 * Second, the load from mem->pools must be ordered before the same
+	 * presumed store. This guarantees that the returned buffer address
+	 * cannot be observed by another CPU before an update of the RCU list
+	 * that was made by swiotlb_dyn_alloc() on a third CPU (cf. multicopy
+	 * atomicity).
+	 *
+	 * See also the comment in is_swiotlb_buffer().
+	 */
+	smp_mb();
 
 	*retpool = pool;
 	return index;