linux-kernel - Re: [PATCH next 4/6] soc: ti: k3-ringacc: add request pair of rings api.

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Date:   Wed, 1 Jul 2020 14:54:08 +0300
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     Grygorii Strashko <grygorii.strashko@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Vinod Koul <vkoul@...nel.org>,
        Santosh Shilimkar <ssantosh@...nel.org>
CC:     Sekhar Nori <nsekhar@...com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Vignesh Raghavendra <vigneshr@...com>,
        <dmaengine@...r.kernel.org>
Subject: Re: [PATCH next 4/6] soc: ti: k3-ringacc: add request pair of rings
 api.

Hi Grygorii,

On 01/07/2020 13.30, Grygorii Strashko wrote:
> Add new API k3_ringacc_request_rings_pair() to request pair of rings at
> once, as in the most cases Rings are used with DMA channels, which need to
> request pair of rings - one to feed DMA with descriptors (TX/RX FDQ) and
> one to receive completions (RX/TX CQ). This will allow to simplify Ringacc
> API users.
> 
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
> ---
>  drivers/soc/ti/k3-ringacc.c       | 24 ++++++++++++++++++++++++
>  include/linux/soc/ti/k3-ringacc.h |  4 ++++
>  2 files changed, 28 insertions(+)
> 
> diff --git a/drivers/soc/ti/k3-ringacc.c b/drivers/soc/ti/k3-ringacc.c
> index 8a8f31d59e24..4cf1150de88e 100644
> --- a/drivers/soc/ti/k3-ringacc.c
> +++ b/drivers/soc/ti/k3-ringacc.c
> @@ -322,6 +322,30 @@ struct k3_ring *k3_ringacc_request_ring(struct k3_ringacc *ringacc,
>  }
>  EXPORT_SYMBOL_GPL(k3_ringacc_request_ring);
>  
> +int k3_ringacc_request_rings_pair(struct k3_ringacc *ringacc,
> +				  int fwd_id, int compl_id,
> +				  struct k3_ring **fwd_ring,
> +				  struct k3_ring **compl_ring)

Would you consider re-arranging the parameter list to:
int k3_ringacc_request_rings_pair(struct k3_ringacc *ringacc,
				  struct k3_ring **fwd_ring, int fwd_id,
				  struct k3_ring **compl_ring, int compl_id)

> +{
> +	int ret = 0;
> +
> +	if (!fwd_ring || !compl_ring)
> +		return -EINVAL;
> +
> +	*fwd_ring = k3_ringacc_request_ring(ringacc, fwd_id, 0);
> +	if (!(*fwd_ring))
> +		return -ENODEV;
> +
> +	*compl_ring = k3_ringacc_request_ring(ringacc, compl_id, 0);
> +	if (!(*compl_ring)) {
> +		k3_ringacc_ring_free(*fwd_ring);
> +		ret = -ENODEV;
> +	}
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(k3_ringacc_request_rings_pair);
> +
>  static void k3_ringacc_ring_reset_sci(struct k3_ring *ring)
>  {
>  	struct k3_ringacc *ringacc = ring->parent;
> diff --git a/include/linux/soc/ti/k3-ringacc.h b/include/linux/soc/ti/k3-ringacc.h
> index 26f73df0a524..7ac115432fa1 100644
> --- a/include/linux/soc/ti/k3-ringacc.h
> +++ b/include/linux/soc/ti/k3-ringacc.h
> @@ -107,6 +107,10 @@ struct k3_ringacc *of_k3_ringacc_get_by_phandle(struct device_node *np,
>  struct k3_ring *k3_ringacc_request_ring(struct k3_ringacc *ringacc,
>  					int id, u32 flags);
>  
> +int k3_ringacc_request_rings_pair(struct k3_ringacc *ringacc,
> +				  int fwd_id, int compl_id,
> +				  struct k3_ring **fwd_ring,
> +				  struct k3_ring **compl_ring);
>  /**
>   * k3_ringacc_ring_reset - ring reset
>   * @ring: pointer on Ring
> 

- Péter

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