netdev - Re: [PATCH net-next] virtio: kdoc for struct virtio_pci_modern

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Date: Tue, 12 Sep 2023 16:54:15 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Shannon Nelson <shannon.nelson@....com>
Cc: kuba@...nel.org, davem@...emloft.net, jasowang@...hat.com,
	virtualization@...ts.linux-foundation.org, brett.creeley@....com,
	netdev@...r.kernel.org, simon.horman@...igine.com,
	eperezma@...hat.com, drivers@...sando.io
Subject: Re: [PATCH net-next] virtio: kdoc for struct virtio_pci_modern_device

On Mon, Sep 11, 2023 at 02:31:04PM -0700, Shannon Nelson wrote:
> 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@...igine.com>
> Signed-off-by: Shannon Nelson <shannon.nelson@....com>
> Acked-by: Eugenio Pérez <eperezma@...hat.com>

not sure why this is net material though.
I think I will take it in virtio tree.

> ---
>  include/linux/virtio_pci_modern.h | 34 ++++++++++++++++++++-----------
>  1 file changed, 22 insertions(+), 12 deletions(-)
> 
> diff --git a/include/linux/virtio_pci_modern.h b/include/linux/virtio_pci_modern.h
> index 067ac1d789bc..a38c729d1973 100644
> --- a/include/linux/virtio_pci_modern.h
> +++ b/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;
>  };
>  
> -- 
> 2.17.1