From 5d7d82d39eb4cab2c7d0d85baaee0fc45d2c7900 Mon Sep 17 00:00:00 2001 From: Shannon Nelson Date: Fri, 19 May 2023 14:56:23 -0700 Subject: virtio: allow caller to override device DMA mask in vp_modern To add a bit of vendor flexibility with various virtio based devices, allow the caller to specify a different DMA mask. This adds a dma_mask field to struct virtio_pci_modern_device. If defined by the driver, this mask will be used in a call to dma_set_mask_and_coherent() instead of the traditional DMA_BIT_MASK(64). This allows limiting the DMA space on vendor devices with address limitations. Signed-off-by: Shannon Nelson Acked-by: Jason Wang Message-Id: <20230519215632.12343-3-shannon.nelson@amd.com> Signed-off-by: Michael S. Tsirkin --- drivers/virtio/virtio_pci_modern_dev.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/virtio') diff --git a/drivers/virtio/virtio_pci_modern_dev.c b/drivers/virtio/virtio_pci_modern_dev.c index 9b2d6614de67..aad7d9296e77 100644 --- a/drivers/virtio/virtio_pci_modern_dev.c +++ b/drivers/virtio/virtio_pci_modern_dev.c @@ -268,7 +268,8 @@ int vp_modern_probe(struct virtio_pci_modern_device *mdev) return -EINVAL; } - err = dma_set_mask_and_coherent(&pci_dev->dev, DMA_BIT_MASK(64)); + err = dma_set_mask_and_coherent(&pci_dev->dev, + mdev->dma_mask ? : DMA_BIT_MASK(64)); if (err) err = dma_set_mask_and_coherent(&pci_dev->dev, DMA_BIT_MASK(32)); -- cgit v1.2.3