linux-kernel - Re: [PATCHv7 05/15] remoteproc/omap: Add the rproc ops .da_to

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Date:   Wed, 4 Mar 2020 10:36:10 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Tero Kristo <t-kristo@...com>
Cc:     bjorn.andersson@...aro.org, ohad@...ery.com,
        linux-remoteproc@...r.kernel.org, afd@...com, s-anna@...com,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCHv7 05/15] remoteproc/omap: Add the rproc ops .da_to_va()
 implementation

On Fri, Feb 21, 2020 at 12:19:26PM +0200, 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>

Acked-by: Mathieu Poirier <mathieu.poirier@...aro.org>

> ---
> v7:
>   - minor kerneldoc updates
> 
>  drivers/remoteproc/omap_remoteproc.c | 40 ++++++++++++++++++++++++++++
>  1 file changed, 40 insertions(+)
> 
> diff --git a/drivers/remoteproc/omap_remoteproc.c b/drivers/remoteproc/omap_remoteproc.c
> index 4f92b069f5d0..89084dd919ba 100644
> --- a/drivers/remoteproc/omap_remoteproc.c
> +++ b/drivers/remoteproc/omap_remoteproc.c
> @@ -247,10 +247,50 @@ static int omap_rproc_stop(struct rproc *rproc)
>  	return 0;
>  }
>  
> +/**
> + * omap_rproc_da_to_va() - internal memory translation helper
> + * @rproc: remote processor to apply the address translation for
> + * @da: device address to translate
> + * @len: length of the memory buffer
> + *
> + * 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.
> + *
> + * Return: translated virtual address in kernel memory space on success,
> + *         or NULL on failure.
> + */
> +static void *omap_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
> +{
> +	struct omap_rproc *oproc = rproc->priv;
> +	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 */
> +			return (__force void *)(oproc->mem[i].cpu_addr +
> +						offset);
> +		}
> +	}
> +
> +	return NULL;
> +}
> +
>  static const struct rproc_ops omap_rproc_ops = {
>  	.start		= omap_rproc_start,
>  	.stop		= omap_rproc_stop,
>  	.kick		= omap_rproc_kick,
> +	.da_to_va	= omap_rproc_da_to_va,
>  };
>  
>  static const struct omap_rproc_mem_data ipu_mems[] = {
> -- 
> 2.17.1
> 
> --
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