Re: [PATCH] usb: gadget: Support transfers from device memory

[Alan Stern]

On Tue, Oct 31, 2023 at 03:54:02AM +0000, Manan Aurora wrote:
> USB gadget stack only supports usb_request objects that point to buffers
> located in memory. Support use cases where data is transferred from
> physical addresses in device mmio regions
> 
> Added a bit "pre_mapped" to usb_request to bypass dma_map_single and
> dma_map_sg for such requests
> 
> The caller must determine the dma address for the request before queuing
> it
> 
> Signed-off-by: Manan Aurora <maurora@xxxxxxxxxx>
> ---

> diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
> index a771ccc038ac..6bc035439098 100644
> --- a/include/linux/usb/gadget.h
> +++ b/include/linux/usb/gadget.h
> @@ -111,6 +111,7 @@ struct usb_request {
>  	unsigned		zero:1;
>  	unsigned		short_not_ok:1;
>  	unsigned		dma_mapped:1;
> +	unsigned		pre_mapped:1;
>  
>  	void			(*complete)(struct usb_ep *ep,
>  					struct usb_request *req);

You forgot to update the kerneldoc for struct usb_request.

Alan Stern