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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 <shannon.nelson@amd.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20230519215632.12343-3-shannon.nelson@amd.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Shannon Nelson 2023-05-19 14:56:23 -07:00 committed by Michael S. Tsirkin
parent a37c0191ac
commit 5d7d82d39e
2 changed files with 5 additions and 1 deletions
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3
drivers/virtio/virtio_pci_modern_dev.c
View File

@ -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));

3
include/linux/virtio_pci_modern.h
View File

@ -41,6 +41,9 @@ struct virtio_pci_modern_device {
/* optional check for vendor virtio device, returns dev_id or -ERRNO */
int (*device_id_check)(struct pci_dev *pdev);
/* optional mask for devices with limited DMA space */
u64 dma_mask;
};
/*