linux-kernel - Re: [PATCH v2 11/19] remoteproc: core: Add function to get resource table spare bytes information

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Date:   Thu, 8 Sep 2016 09:32:51 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Loic Pallardy <loic.pallardy@...com>
Cc:     bjorn.andersson@...aro.org, ohad@...ery.com,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...inux.com
Subject: Re: [PATCH v2 11/19] remoteproc: core: Add function to get resource
 table spare bytes information

On Wed, 31 Aug 2016, Loic Pallardy wrote:

> Remoteproc needs to know if a resource table has spare resource
> allowing resoure table extension.
> This function parse resource table to detect spare resource.
> If any, it returns available spare bytes and index of spare resource.
> 
> Signed-off-by: Loic Pallardy <loic.pallardy@...com>
> ---
>  drivers/remoteproc/remoteproc_core.c | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
> 
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index ffb56c0..30e9c70 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -951,6 +951,35 @@ int rproc_request_resource(struct rproc *rproc, u32 type, u32 action, void *reso
>  }
>  EXPORT_SYMBOL(rproc_request_resource);
>  
> +static int __get_rsc_tbl_spare_size(struct rproc *rproc,

size_t?

> +					  struct resource_table *table_ptr, int len,
> +					  int *spare_index)
> +{
> +	struct device *dev = &rproc->dev;
> +	int i;
> +
> +	for (i = 0; i < table_ptr->num; i++) {
> +		int offset = table_ptr->offset[i];
> +		struct fw_rsc_hdr *hdr = (void *)table_ptr + offset;
> +		struct fw_rsc_spare *spare = (void *)hdr + sizeof(*hdr);
> +
> +		dev_dbg(dev, "rsc: type %d\n", hdr->type);

This doesn't need to be in upstream code.

> +		if (hdr->type >= RSC_LAST) {
> +			dev_warn(dev, "unsupported resource %d\n", hdr->type);
> +			continue;
> +		}

If we're only interested in RSC_SPARE, I think we can omit this check.

No need to police the resource table everywhere.

> +		if (hdr->type != RSC_SPARE)
> +			continue;
> +
> +		*spare_index = i;
> +		return spare->len;
> +	}
> +
> +	return 0;
> +}
> +
>  static int __verify_rsc_tbl_entry(struct rproc *rproc,
>  				struct rproc_request_resource *request,
>  				struct resource_table *table, int size)

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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