netdev - Re: [PATCH v8 1/2] bus: mhi: Add mhi_queue_is

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Date:   Fri, 30 Oct 2020 14:35:39 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Loic Poulain <loic.poulain@...aro.org>
Cc:     kuba@...nel.org, davem@...emloft.net, hemantk@...eaurora.org,
        netdev@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        bbhatt@...eaurora.org, willemdebruijn.kernel@...il.com,
        jhugo@...eaurora.org
Subject: Re: [PATCH v8 1/2] bus: mhi: Add mhi_queue_is_full function

On Wed, Oct 28, 2020 at 05:34:57PM +0100, Loic Poulain wrote:
> This function can be used by client driver to determine whether it's
> possible to queue new elements in a channel ring.
> 
> Signed-off-by: Loic Poulain <loic.poulain@...aro.org>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

Thanks,
Mani

> ---
>  v1->v5: not part of the series
>  v6: Add this commit, used for stopping TX queue
>  v7: no change
>  v8: remove static change (up to the compiler)
> 
>  drivers/bus/mhi/core/main.c | 11 +++++++++++
>  include/linux/mhi.h         |  7 +++++++
>  2 files changed, 18 insertions(+)
> 
> diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c
> index a588eac..bab38d2 100644
> --- a/drivers/bus/mhi/core/main.c
> +++ b/drivers/bus/mhi/core/main.c
> @@ -1173,6 +1173,17 @@ int mhi_queue_buf(struct mhi_device *mhi_dev, enum dma_data_direction dir,
>  }
>  EXPORT_SYMBOL_GPL(mhi_queue_buf);
>  
> +bool mhi_queue_is_full(struct mhi_device *mhi_dev, enum dma_data_direction dir)
> +{
> +	struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;
> +	struct mhi_chan *mhi_chan = (dir == DMA_TO_DEVICE) ?
> +					mhi_dev->ul_chan : mhi_dev->dl_chan;
> +	struct mhi_ring *tre_ring = &mhi_chan->tre_ring;
> +
> +	return mhi_is_ring_full(mhi_cntrl, tre_ring);
> +}
> +EXPORT_SYMBOL_GPL(mhi_queue_is_full);
> +
>  int mhi_send_cmd(struct mhi_controller *mhi_cntrl,
>  		 struct mhi_chan *mhi_chan,
>  		 enum mhi_cmd_type cmd)
> diff --git a/include/linux/mhi.h b/include/linux/mhi.h
> index 9d67e75..f72c3a4 100644
> --- a/include/linux/mhi.h
> +++ b/include/linux/mhi.h
> @@ -745,4 +745,11 @@ int mhi_queue_buf(struct mhi_device *mhi_dev, enum dma_data_direction dir,
>  int mhi_queue_skb(struct mhi_device *mhi_dev, enum dma_data_direction dir,
>  		  struct sk_buff *skb, size_t len, enum mhi_flags mflags);
>  
> +/**
> + * mhi_queue_is_full - Determine whether queueing new elements is possible
> + * @mhi_dev: Device associated with the channels
> + * @dir: DMA direction for the channel
> + */
> +bool mhi_queue_is_full(struct mhi_device *mhi_dev, enum dma_data_direction dir);
> +
>  #endif /* _MHI_H_ */
> -- 
> 2.7.4
>