linux-kernel - Re: [PATCH v7 06/12] dmaengine: ti: Add cppi5 header for K3 NAVSS/UDMA

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Message-ID: <20191220095455.GM2536@vkoul-mobl>
Date:   Fri, 20 Dec 2019 15:24:55 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Peter Ujfalusi <peter.ujfalusi@...com>
Cc:     robh+dt@...nel.org, nm@...com, ssantosh@...nel.org,
        dan.j.williams@...el.com, dmaengine@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, grygorii.strashko@...com,
        lokeshvutla@...com, t-kristo@...com, tony@...mide.com,
        j-keerthy@...com, vigneshr@...com
Subject: Re: [PATCH v7 06/12] dmaengine: ti: Add cppi5 header for K3
 NAVSS/UDMA

On 09-12-19, 11:43, Peter Ujfalusi wrote:

> +#define CPPI5_INFO2_DESC_RETPUSHPOLICY		BIT(16)
> +#define CPPI5_INFO2_DESC_RETP_MASK		GENMASK(18, 16)
> +
> +#define CPPI5_INFO2_DESC_RETQ_SHIFT		(0)
> +#define CPPI5_INFO2_DESC_RETQ_MASK		GENMASK(15, 0)
> +
> +#define CPPI5_INFO3_DESC_SRCTAG_SHIFT		(16U)
> +#define CPPI5_INFO3_DESC_SRCTAG_MASK		GENMASK(31, 16)
> +#define CPPI5_INFO3_DESC_DSTTAG_SHIFT		(0)
> +#define CPPI5_INFO3_DESC_DSTTAG_MASK		GENMASK(15, 0)
> +
> +#define CPPI5_BUFINFO1_HDESC_DATA_LEN_SHIFT	(0)
> +#define CPPI5_BUFINFO1_HDESC_DATA_LEN_MASK	GENMASK(27, 0)
> +
> +#define CPPI5_OBUFINFO0_HDESC_BUF_LEN_SHIFT	(0)
> +#define CPPI5_OBUFINFO0_HDESC_BUF_LEN_MASK	GENMASK(27, 0)

I think you can remove the SHIFT defines and use ffs() to get the bit
position for shift

> +static inline u32 cppi5_hdesc_calc_size(bool epib, u32 psdata_size,
> +					u32 sw_data_size)
> +{
> +	u32 desc_size;
> +
> +	if (psdata_size > CPPI5_INFO0_HDESC_PSDATA_MAX_SIZE)
> +		return 0;
> +
> +	desc_size = sizeof(struct cppi5_host_desc_t) + psdata_size +
> +		    sw_data_size;

I think there was an API for this kind of mem allocation of struct and
buffer attached...

> +static inline void cppi5_hdesc_reset_hbdesc(struct cppi5_host_desc_t *desc)
> +{
> +	desc->hdr = (struct cppi5_desc_hdr_t) { 0 };
> +	desc->next_desc = 0;

would this not be superfluous? Or if you want a memset call?

> +static inline u32 *cppi5_hdesc_get_psdata32(struct cppi5_host_desc_t *desc)
> +{
> +	return (u32 *)cppi5_hdesc_get_psdata(desc);

you dont need casts away from void *

-- 
~Vinod