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Date:   Mon, 4 May 2020 11:31:31 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Alex Elder <elder@...aro.org>
Cc:     davem@...emloft.net, evgreen@...omium.org, subashab@...eaurora.org,
        cpratapa@...eaurora.org, agross@...nel.org, robh+dt@...nel.org,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 2/4] net: ipa: redefine struct ipa_mem_data

On Mon 04 May 10:58 PDT 2020, Alex Elder wrote:

> The ipa_mem_data structure type was never actually used.  Instead,
> the IPA memory regions were defined using the ipa_mem structure.
> 
> Redefine struct ipa_mem_data so it encapsulates the array of IPA-local
> memory region descriptors along with the count of entries in that
> array.  Pass just an ipa_mem structure pointer to ipa_mem_init().
> 
> Rename the ipa_mem_data[] array ipa_mem_local_data[] to emphasize
> that the memory regions it defines are IPA-local memory.
> 
> Signed-off-by: Alex Elder <elder@...aro.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> ---
>  drivers/net/ipa/ipa_data-sc7180.c | 10 +++++++---
>  drivers/net/ipa/ipa_data-sdm845.c | 10 +++++++---
>  drivers/net/ipa/ipa_data.h        | 13 +++++--------
>  drivers/net/ipa/ipa_main.c        |  2 +-
>  drivers/net/ipa/ipa_mem.c         |  9 +++++----
>  drivers/net/ipa/ipa_mem.h         |  3 ++-
>  6 files changed, 27 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/net/ipa/ipa_data-sc7180.c b/drivers/net/ipa/ipa_data-sc7180.c
> index 042b5fc3c135..f97e7e4e61c1 100644
> --- a/drivers/net/ipa/ipa_data-sc7180.c
> +++ b/drivers/net/ipa/ipa_data-sc7180.c
> @@ -193,7 +193,7 @@ static const struct ipa_resource_data ipa_resource_data = {
>  };
>  
>  /* IPA-resident memory region configuration for the SC7180 SoC. */
> -static const struct ipa_mem ipa_mem_data[] = {
> +static const struct ipa_mem ipa_mem_local_data[] = {
>  	[IPA_MEM_UC_SHARED] = {
>  		.offset		= 0x0000,
>  		.size		= 0x0080,
> @@ -296,12 +296,16 @@ static const struct ipa_mem ipa_mem_data[] = {
>  	},
>  };
>  
> +static struct ipa_mem_data ipa_mem_data = {
> +	.local_count	= ARRAY_SIZE(ipa_mem_local_data),
> +	.local		= ipa_mem_local_data,
> +};
> +
>  /* Configuration data for the SC7180 SoC. */
>  const struct ipa_data ipa_data_sc7180 = {
>  	.version	= IPA_VERSION_4_2,
>  	.endpoint_count	= ARRAY_SIZE(ipa_gsi_endpoint_data),
>  	.endpoint_data	= ipa_gsi_endpoint_data,
>  	.resource_data	= &ipa_resource_data,
> -	.mem_count	= ARRAY_SIZE(ipa_mem_data),
> -	.mem_data	= ipa_mem_data,
> +	.mem_data	= &ipa_mem_data,
>  };
> diff --git a/drivers/net/ipa/ipa_data-sdm845.c b/drivers/net/ipa/ipa_data-sdm845.c
> index 0d9c36e1e806..c55507e94559 100644
> --- a/drivers/net/ipa/ipa_data-sdm845.c
> +++ b/drivers/net/ipa/ipa_data-sdm845.c
> @@ -235,7 +235,7 @@ static const struct ipa_resource_data ipa_resource_data = {
>  };
>  
>  /* IPA-resident memory region configuration for the SDM845 SoC. */
> -static const struct ipa_mem ipa_mem_data[] = {
> +static const struct ipa_mem ipa_mem_local_data[] = {
>  	[IPA_MEM_UC_SHARED] = {
>  		.offset		= 0x0000,
>  		.size		= 0x0080,
> @@ -318,12 +318,16 @@ static const struct ipa_mem ipa_mem_data[] = {
>  	},
>  };
>  
> +static struct ipa_mem_data ipa_mem_data = {
> +	.local_count	= ARRAY_SIZE(ipa_mem_local_data),
> +	.local		= ipa_mem_local_data,
> +};
> +
>  /* Configuration data for the SDM845 SoC. */
>  const struct ipa_data ipa_data_sdm845 = {
>  	.version	= IPA_VERSION_3_5_1,
>  	.endpoint_count	= ARRAY_SIZE(ipa_gsi_endpoint_data),
>  	.endpoint_data	= ipa_gsi_endpoint_data,
>  	.resource_data	= &ipa_resource_data,
> -	.mem_count	= ARRAY_SIZE(ipa_mem_data),
> -	.mem_data	= ipa_mem_data,
> +	.mem_data	= &ipa_mem_data,
>  };
> diff --git a/drivers/net/ipa/ipa_data.h b/drivers/net/ipa/ipa_data.h
> index 7110de2de817..51d8e5a6f23a 100644
> --- a/drivers/net/ipa/ipa_data.h
> +++ b/drivers/net/ipa/ipa_data.h
> @@ -246,14 +246,12 @@ struct ipa_resource_data {
>  
>  /**
>   * struct ipa_mem - IPA-local memory region description
> - * @offset:		offset in IPA memory space to base of the region
> - * @size:		size in bytes base of the region
> - * @canary_count:	number of 32-bit "canary" values that precede region
> + * @local_count:	number of regions defined in the local[] array
> + * @local:		array of IPA-local memory region descriptors
>   */
>  struct ipa_mem_data {
> -	u32 offset;
> -	u16 size;
> -	u16 canary_count;
> +	u32 local_count;
> +	const struct ipa_mem *local;
>  };
>  
>  /**
> @@ -270,8 +268,7 @@ struct ipa_data {
>  	u32 endpoint_count;	/* # entries in endpoint_data[] */
>  	const struct ipa_gsi_endpoint_data *endpoint_data;
>  	const struct ipa_resource_data *resource_data;
> -	u32 mem_count;		/* # entries in mem_data[] */
> -	const struct ipa_mem *mem_data;
> +	const struct ipa_mem_data *mem_data;
>  };
>  
>  extern const struct ipa_data ipa_data_sdm845;
> diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c
> index 28998dcce3d2..9295a9122e8e 100644
> --- a/drivers/net/ipa/ipa_main.c
> +++ b/drivers/net/ipa/ipa_main.c
> @@ -778,7 +778,7 @@ static int ipa_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto err_kfree_ipa;
>  
> -	ret = ipa_mem_init(ipa, data->mem_count, data->mem_data);
> +	ret = ipa_mem_init(ipa, data->mem_data);
>  	if (ret)
>  		goto err_reg_exit;
>  
> diff --git a/drivers/net/ipa/ipa_mem.c b/drivers/net/ipa/ipa_mem.c
> index 42d2c29d9f0c..fb4de2a12796 100644
> --- a/drivers/net/ipa/ipa_mem.c
> +++ b/drivers/net/ipa/ipa_mem.c
> @@ -12,6 +12,7 @@
>  
>  #include "ipa.h"
>  #include "ipa_reg.h"
> +#include "ipa_data.h"
>  #include "ipa_cmd.h"
>  #include "ipa_mem.h"
>  #include "ipa_data.h"
> @@ -266,15 +267,15 @@ int ipa_mem_zero_modem(struct ipa *ipa)
>  }
>  
>  /* Perform memory region-related initialization */
> -int ipa_mem_init(struct ipa *ipa, u32 count, const struct ipa_mem *mem)
> +int ipa_mem_init(struct ipa *ipa, const struct ipa_mem_data *mem_data)
>  {
>  	struct device *dev = &ipa->pdev->dev;
>  	struct resource *res;
>  	int ret;
>  
> -	if (count > IPA_MEM_COUNT) {
> +	if (mem_data->local_count > IPA_MEM_COUNT) {
>  		dev_err(dev, "to many memory regions (%u > %u)\n",
> -			count, IPA_MEM_COUNT);
> +			mem_data->local_count, IPA_MEM_COUNT);
>  		return -EINVAL;
>  	}
>  
> @@ -302,7 +303,7 @@ int ipa_mem_init(struct ipa *ipa, u32 count, const struct ipa_mem *mem)
>  	ipa->mem_size = resource_size(res);
>  
>  	/* The ipa->mem[] array is indexed by enum ipa_mem_id values */
> -	ipa->mem = mem;
> +	ipa->mem = mem_data->local;
>  
>  	return 0;
>  }
> diff --git a/drivers/net/ipa/ipa_mem.h b/drivers/net/ipa/ipa_mem.h
> index 065cb499ebe5..f99180f84f0d 100644
> --- a/drivers/net/ipa/ipa_mem.h
> +++ b/drivers/net/ipa/ipa_mem.h
> @@ -7,6 +7,7 @@
>  #define _IPA_MEM_H_
>  
>  struct ipa;
> +struct ipa_mem_data;
>  
>  /**
>   * DOC: IPA Local Memory
> @@ -84,7 +85,7 @@ void ipa_mem_teardown(struct ipa *ipa);
>  
>  int ipa_mem_zero_modem(struct ipa *ipa);
>  
> -int ipa_mem_init(struct ipa *ipa, u32 count, const struct ipa_mem *mem);
> +int ipa_mem_init(struct ipa *ipa, const struct ipa_mem_data *mem_data);
>  void ipa_mem_exit(struct ipa *ipa);
>  
>  #endif /* _IPA_MEM_H_ */
> -- 
> 2.20.1
> 

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