virtio: kdoc for struct virtio_pci_modern_device

Finally following up to Simon's suggestion for some kdoc attention
on struct virtio_pci_modern_device.

Link: https://lore.kernel.org/netdev/ZE%2FQS0lnUvxFacjf@corigine.com/
Cc: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Acked-by: Eugenio Pérez <eperezma@redhat.com>
Message-Id: <20230911213104.14391-1-shannon.nelson@amd.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>

include/linux/virtio_pci_modern.h

@@ -12,37 +12,47 @@ struct virtio_pci_modern_common_cfg {
 	__le16 queue_reset;		/* read-write */
 };
 
+/**
+ * struct virtio_pci_modern_device - info for modern PCI virtio
+ * @pci_dev:	    Ptr to the PCI device struct
+ * @common:	    Position of the common capability in the PCI config
+ * @device:	    Device-specific data (non-legacy mode)
+ * @notify_base:    Base of vq notifications (non-legacy mode)
+ * @notify_pa:	    Physical base of vq notifications
+ * @isr:	    Where to read and clear interrupt
+ * @notify_len:	    So we can sanity-check accesses
+ * @device_len:	    So we can sanity-check accesses
+ * @notify_map_cap: Capability for when we need to map notifications per-vq
+ * @notify_offset_multiplier: Multiply queue_notify_off by this value
+ *                            (non-legacy mode).
+ * @modern_bars:    Bitmask of BARs
+ * @id:		    Device and vendor id
+ * @device_id_check: Callback defined before vp_modern_probe() to be used to
+ *		    verify the PCI device is a vendor's expected device rather
+ *		    than the standard virtio PCI device
+ *		    Returns the found device id or ERRNO
+ * @dma_mask:	    Optional mask instead of the traditional DMA_BIT_MASK(64),
+ *		    for vendor devices with DMA space address limitations
+ */
 struct virtio_pci_modern_device {
 	struct pci_dev *pci_dev;
 
 	struct virtio_pci_common_cfg __iomem *common;
-	/* Device-specific data (non-legacy mode)  */
 	void __iomem *device;
-	/* Base of vq notifications (non-legacy mode). */
 	void __iomem *notify_base;
-	/* Physical base of vq notifications */
 	resource_size_t notify_pa;
-	/* Where to read and clear interrupt */
 	u8 __iomem *isr;
 
-	/* So we can sanity-check accesses. */
 	size_t notify_len;
 	size_t device_len;
 
-	/* Capability for when we need to map notifications per-vq. */
 	int notify_map_cap;
 
-	/* Multiply queue_notify_off by this value. (non-legacy mode). */
 	u32 notify_offset_multiplier;
-
 	int modern_bars;
-
 	struct virtio_device_id id;
 
-	/* 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;
 };