linux-kernel - Re: [Patch v1 04/10] memory: tegra: add support for software mc clients in Tegra234

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Message-ID: <ec955be9-affb-e84c-0b27-c27235608a81@linaro.org>
Date:   Thu, 22 Dec 2022 12:36:33 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Sumit Gupta <sumitg@...dia.com>, treding@...dia.com,
        dmitry.osipenko@...labora.com, viresh.kumar@...aro.org,
        rafael@...nel.org, jonathanh@...dia.com, robh+dt@...nel.org,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org
Cc:     sanjayc@...dia.com, ksitaraman@...dia.com, ishah@...dia.com,
        bbasu@...dia.com
Subject: Re: [Patch v1 04/10] memory: tegra: add support for software mc
 clients in Tegra234

On 20/12/2022 17:02, Sumit Gupta wrote:
> Adding support for dummy memory controller clients for use by
> software.

Use imperative mode (applies to other commits as well)
https://elixir.bootlin.com/linux/v5.17.1/source/Documentation/process/submitting-patches.rst#L95

> ---
>  drivers/memory/tegra/mc.c       | 65 +++++++++++++++++++++++----------
>  drivers/memory/tegra/tegra234.c | 21 +++++++++++
>  include/soc/tegra/mc.h          |  3 ++
>  include/soc/tegra/tegra-icc.h   |  7 ++++
>  4 files changed, 76 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c
> index ff887fb03bce..4ddf9808fe6b 100644
> --- a/drivers/memory/tegra/mc.c
> +++ b/drivers/memory/tegra/mc.c
> @@ -755,6 +755,39 @@ const char *const tegra_mc_error_names[8] = {
>  	[6] = "SMMU translation error",
>  };
>  
> +static int tegra_mc_add_icc_node(struct tegra_mc *mc, unsigned int id, const char *name,
> +				 unsigned int bpmp_id, unsigned int type)
> +{
> +	struct tegra_icc_node *tnode;
> +	struct icc_node *node;
> +	int err;
> +
> +	tnode = kzalloc(sizeof(*tnode), GFP_KERNEL);
> +	if (!tnode)
> +		return -ENOMEM;
> +
> +	/* create MC client node */
> +	node = icc_node_create(id);
> +	if (IS_ERR(node))
> +		return -EINVAL;

Why do you return other error? It does not look like you moved the code
correctly, but with changes. I also do not see how this is related to
commit msg...

> +
> +	node->name = name;
> +	icc_node_add(node, &mc->provider);
> +
> +	/* link Memory Client to Memory Controller */
> +	err = icc_link_create(node, TEGRA_ICC_MC);
> +	if (err)
> +		return err;
> +
> +	node->data = tnode;
> +	tnode->node = node;
> +	tnode->bpmp_id = bpmp_id;
> +	tnode->type = type;
> +	tnode->mc = mc;
> +
> +	return 0;
> +}
> +
>  /*
>   * Memory Controller (MC) has few Memory Clients that are issuing memory
>   * bandwidth allocation requests to the MC interconnect provider. The MC
> @@ -780,7 +813,6 @@ const char *const tegra_mc_error_names[8] = {
>   */
>  static int tegra_mc_interconnect_setup(struct tegra_mc *mc)
>  {
> -	struct tegra_icc_node *tnode;
>  	struct icc_node *node;
>  	unsigned int i;
>  	int err;
> @@ -820,30 +852,23 @@ static int tegra_mc_interconnect_setup(struct tegra_mc *mc)
>  		goto remove_nodes;
>  
>  	for (i = 0; i < mc->soc->num_clients; i++) {
> -		tnode = kzalloc(sizeof(*tnode), GFP_KERNEL);
> -		if (!tnode)
> -			return -ENOMEM;
> -
> -		/* create MC client node */
> -		node = icc_node_create(mc->soc->clients[i].id);
> -		if (IS_ERR(node)) {
> -			err = PTR_ERR(node);
> +		err = tegra_mc_add_icc_node(mc, mc->soc->clients[i].id,
> +					    mc->soc->clients[i].name,
> +					    mc->soc->clients[i].bpmp_id,
> +					    mc->soc->clients[i].type);
> +		if (err)
>  			goto remove_nodes;
> -		}
>  
> -		node->name = mc->soc->clients[i].name;
> -		icc_node_add(node, &mc->provider);
> +	}
> +

Best regards,
Krzysztof