linux-kernel - Re: [PATCH v2] USB: Improve usb_fill

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Message-ID: <864ef3f5-4bf6-9012-eccb-f65d07b9470b@infradead.org>
Date:   Tue, 20 Dec 2022 15:15:01 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Ricardo Ribalda <ribalda@...omium.org>,
        Christoph Hellwig <hch@....de>,
        Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] USB: Improve usb_fill_* documentation



On 12/20/22 15:13, Ricardo Ribalda wrote:
> Make the developer aware of the requirements of transfer buffer.
> 
> The buffer must be DMAble, if the developer uses an invalid buffer, data
> corruption might happen.
> 
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> ---
> USB: Improve usb_fill_* documentation
> 
> After trying to "cleanup" the uvc code, I was patiently explained about
> the requirements of the urb transfer buffers.
> 
> Lets make this explicit, so other developers do not make the same mistake.
> 
> To: Randy Dunlap <rdunlap@...radead.org>
> To: Alan Stern <stern@...land.harvard.edu>
> To: Christoph Hellwig <hch@....de>
> To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: linux-usb@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org

LGTM. Thanks.

Acked-by: Randy Dunlap <rdunlap@...radead.org>

> ---
> Changes in v2:
> - s/allocatiing/allocating/ Thanks Randy
> - Link to v1: https://lore.kernel.org/r/20221220-usb-dmadoc-v1-0-28386d2eb6cd@chromium.org
> ---
>  include/linux/usb.h | 27 ++++++++++++++++++++++++---
>  1 file changed, 24 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/usb.h b/include/linux/usb.h
> index 7d5325d47c45..1144ef6e4151 100644
> --- a/include/linux/usb.h
> +++ b/include/linux/usb.h
> @@ -1627,13 +1627,20 @@ struct urb {
>   * @dev: pointer to the struct usb_device for this urb.
>   * @pipe: the endpoint pipe
>   * @setup_packet: pointer to the setup_packet buffer
> - * @transfer_buffer: pointer to the transfer buffer
> + * @transfer_buffer: pointer to the transfer buffer. Must be suitable for DMA.
>   * @buffer_length: length of the transfer buffer
>   * @complete_fn: pointer to the usb_complete_t function
>   * @context: what to set the urb context to.
>   *
>   * Initializes a control urb with the proper information needed to submit
>   * it to a device.
> + *
> + * The transfer buffer might be filled via DMA. The simplest way to get
> + * a buffer that can be DMAed to, is allocating it via kmalloc() or
> + * equivalent, even for very small buffers. If transfer_buffer is embedded
> + * in a bigger structure, there is a risk that the previous and following
> + * fields are left in a corrupted state by the DMA engine, if the platform
> + * is not cache coherent.
>   */
>  static inline void usb_fill_control_urb(struct urb *urb,
>  					struct usb_device *dev,
> @@ -1658,13 +1665,20 @@ static inline void usb_fill_control_urb(struct urb *urb,
>   * @urb: pointer to the urb to initialize.
>   * @dev: pointer to the struct usb_device for this urb.
>   * @pipe: the endpoint pipe
> - * @transfer_buffer: pointer to the transfer buffer
> + * @transfer_buffer: pointer to the transfer buffer. Must be suitable for DMA.
>   * @buffer_length: length of the transfer buffer
>   * @complete_fn: pointer to the usb_complete_t function
>   * @context: what to set the urb context to.
>   *
>   * Initializes a bulk urb with the proper information needed to submit it
>   * to a device.
> + *
> + * The transfer buffer might be filled via DMA. The simplest way to get
> + * a buffer that can be DMAed to, is allocating it via kmalloc() or
> + * equivalent, even for very small buffers. If transfer_buffer is embedded
> + * in a bigger structure, there is a risk that the previous and following
> + * fields are left in a corrupted state by the DMA engine, if the platform
> + * is not cache coherent.
>   */
>  static inline void usb_fill_bulk_urb(struct urb *urb,
>  				     struct usb_device *dev,
> @@ -1687,7 +1701,7 @@ static inline void usb_fill_bulk_urb(struct urb *urb,
>   * @urb: pointer to the urb to initialize.
>   * @dev: pointer to the struct usb_device for this urb.
>   * @pipe: the endpoint pipe
> - * @transfer_buffer: pointer to the transfer buffer
> + * @transfer_buffer: pointer to the transfer buffer. Must be suitable for DMA.
>   * @buffer_length: length of the transfer buffer
>   * @complete_fn: pointer to the usb_complete_t function
>   * @context: what to set the urb context to.
> @@ -1697,6 +1711,13 @@ static inline void usb_fill_bulk_urb(struct urb *urb,
>   * Initializes a interrupt urb with the proper information needed to submit
>   * it to a device.
>   *
> + * The transfer buffer might be filled via DMA. The simplest way to get
> + * a buffer that can be DMAed to, is allocating it via kmalloc() or
> + * equivalent, even for very small buffers. If transfer_buffer is embedded
> + * in a bigger structure, there is a risk that the previous and following
> + * fields are left in a corrupted state by the DMA engine, if the platform
> + * is not cache coherent.
> + *
>   * Note that High Speed and SuperSpeed(+) interrupt endpoints use a logarithmic
>   * encoding of the endpoint interval, and express polling intervals in
>   * microframes (eight per millisecond) rather than in frames (one per
> 
> ---
> base-commit: b6bb9676f2165d518b35ba3bea5f1fcfc0d969bf
> change-id: 20221220-usb-dmadoc-29384acebd48
> 
> Best regards,

-- 
~Randy