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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>
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parent
a37c0191ac
commit
5d7d82d39e
2 changed files with 5 additions and 1 deletions
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@ -268,7 +268,8 @@ int vp_modern_probe(struct virtio_pci_modern_device *mdev)
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return -EINVAL;
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return -EINVAL;
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}
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}
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err = dma_set_mask_and_coherent(&pci_dev->dev, DMA_BIT_MASK(64));
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err = dma_set_mask_and_coherent(&pci_dev->dev,
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mdev->dma_mask ? : DMA_BIT_MASK(64));
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if (err)
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if (err)
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err = dma_set_mask_and_coherent(&pci_dev->dev,
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err = dma_set_mask_and_coherent(&pci_dev->dev,
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DMA_BIT_MASK(32));
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DMA_BIT_MASK(32));
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@ -41,6 +41,9 @@ struct virtio_pci_modern_device {
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/* optional check for vendor virtio device, returns dev_id or -ERRNO */
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/* optional check for vendor virtio device, returns dev_id or -ERRNO */
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int (*device_id_check)(struct pci_dev *pdev);
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int (*device_id_check)(struct pci_dev *pdev);
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/* optional mask for devices with limited DMA space */
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u64 dma_mask;
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};
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};
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/*
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/*
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