linux-kernel - Re: [PATCH 06/17] remoteproc/omap: Add the rproc ops .da_to

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Date:   Mon, 11 Nov 2019 15:22:51 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Tero Kristo <t-kristo@...com>
Cc:     ohad@...ery.com, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        s-anna@...com
Subject: Re: [PATCH 06/17] remoteproc/omap: Add the rproc ops .da_to_va()
 implementation

On Mon 28 Oct 05:42 PDT 2019, Tero Kristo wrote:

> From: Suman Anna <s-anna@...com>
> 
> An implementation for the rproc ops .da_to_va() has been added
> that provides the address translation between device addresses
> to kernel virtual addresses for internal RAMs present on that
> particular remote processor device. The implementation provides
> the translations based on the addresses parsed and stored during
> the probe.
> 
> This ops gets invoked by the exported rproc_da_to_va() function
> and allows the remoteproc core's ELF loader to be able to load
> program data directly into the internal memories.
> 
> Signed-off-by: Suman Anna <s-anna@...com>
> Signed-off-by: Tero Kristo <t-kristo@...com>
> ---
>  drivers/remoteproc/omap_remoteproc.c | 35 ++++++++++++++++++++++++++++
>  1 file changed, 35 insertions(+)
> 
> diff --git a/drivers/remoteproc/omap_remoteproc.c b/drivers/remoteproc/omap_remoteproc.c
> index bbd6ff360e10..0524f7e0ffa4 100644
> --- a/drivers/remoteproc/omap_remoteproc.c
> +++ b/drivers/remoteproc/omap_remoteproc.c
> @@ -230,10 +230,45 @@ static int omap_rproc_stop(struct rproc *rproc)
>  	return 0;
>  }
>  
> +/*
> + * Internal Memory translation helper

Please format this as kerneldoc.

> + *
> + * Custom function implementing the rproc .da_to_va ops to provide address
> + * translation (device address to kernel virtual address) for internal RAMs
> + * present in a DSP or IPU device). The translated addresses can be used
> + * either by the remoteproc core for loading, or by any rpmsg bus drivers.
> + */
> +static void *omap_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
> +{
> +	struct omap_rproc *oproc = rproc->priv;
> +	void *va = NULL;
> +	int i;
> +	u32 offset;
> +
> +	if (len <= 0)
> +		return NULL;
> +
> +	if (!oproc->num_mems)
> +		return NULL;
> +
> +	for (i = 0; i < oproc->num_mems; i++) {
> +		if (da >= oproc->mem[i].dev_addr && da + len <=
> +		    oproc->mem[i].dev_addr +  oproc->mem[i].size) {
> +			offset = da -  oproc->mem[i].dev_addr;
> +			/* __force to make sparse happy with type conversion */
> +			va = (__force void *)(oproc->mem[i].cpu_addr + offset);

Replace va = and break; with just a return here.

> +			break;
> +		}
> +	}
> +
> +	return va;

return NULL here.

Regards,
Bjorn