From: Will Deacon will@kernel.org
stable inclusion from stable-v5.10.88 commit e3a1ab5aea4c55c4dd69514fcd322c5f8e2b0148 bugzilla: 186058 https://gitee.com/openeuler/kernel/issues/I4QW6A
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit 817fc978b5a29b039db0418a91072b31c9aab152 upstream.
virtio_max_dma_size() returns the maximum DMA mapping size of the virtio device by querying dma_max_mapping_size() for the device when the DMA API is in use for the vring. Unfortunately, the device passed is initialised by register_virtio_device() and does not inherit the DMA configuration from its parent, resulting in SWIOTLB errors when bouncing is enabled and the default 256K mapping limit (IO_TLB_SEGSIZE) is not respected:
| virtio-pci 0000:00:01.0: swiotlb buffer is full (sz: 294912 bytes), total 1024 (slots), used 725 (slots)
Follow the pattern used elsewhere in the virtio_ring code when calling into the DMA layer and pass the parent device to dma_max_mapping_size() instead.
Cc: Marc Zyngier maz@kernel.org Cc: Quentin Perret qperret@google.com Cc: "Michael S. Tsirkin" mst@redhat.com Cc: Jason Wang jasowang@redhat.com Signed-off-by: Will Deacon will@kernel.org Link: https://lore.kernel.org/r/20211201112018.25276-1-will@kernel.org Acked-by: Jason Wang jasowang@redhat.com Tested-by: Suzuki K Poulose suzuki.poulose@arm.com Fixes: e6d6dd6c875e ("virtio: Introduce virtio_max_dma_size()") Cc: Joerg Roedel jroedel@suse.de Cc: Konrad Rzeszutek Wilk konrad.wilk@oracle.com Cc: Christoph Hellwig hch@lst.de Cc: Robin Murphy robin.murphy@arm.com Signed-off-by: Steven Price steven.price@arm.com Signed-off-by: Suzuki K Poulose suzuki.poulose@arm.com Cc: stable@vger.kernel.org Signed-off-by: Michael S. Tsirkin mst@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Chen Jun chenjun102@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/virtio/virtio_ring.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index e9432dbbec0a..cce75d3b3ba0 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -263,7 +263,7 @@ size_t virtio_max_dma_size(struct virtio_device *vdev) size_t max_segment_size = SIZE_MAX;
if (vring_use_dma_api(vdev)) - max_segment_size = dma_max_mapping_size(&vdev->dev); + max_segment_size = dma_max_mapping_size(vdev->dev.parent);
return max_segment_size; }