linux-kernel - Re: [RFC PATCH v2 11/17] irqchip: Add driver for the RISC-V RPMI system MSI service group

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Message-ID: <871pwfp272.ffs@tglx>
Date: Mon, 03 Feb 2025 14:50:25 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Anup Patel <apatel@...tanamicro.com>, Michael Turquette
 <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>, Rob Herring
 <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Jassi Brar <jassisinghbrar@...il.com>, "Rafael J .
 Wysocki" <rafael@...nel.org>, Mika Westerberg
 <mika.westerberg@...ux.intel.com>, Andy Shevchenko
 <andriy.shevchenko@...ux.intel.com>, Linus Walleij
 <linus.walleij@...aro.org>, Bartosz Golaszewski <brgl@...ev.pl>, Uwe
 Kleine-König <ukleinek@...nel.org>
Cc: Palmer Dabbelt <palmer@...belt.com>, Paul Walmsley
 <paul.walmsley@...ive.com>, Len Brown <lenb@...nel.org>, Sunil V L
 <sunilvl@...tanamicro.com>, Rahul Pathak <rpathak@...tanamicro.com>,
 Leyfoon Tan <leyfoon.tan@...rfivetech.com>, Atish Patra
 <atishp@...shpatra.org>, Andrew Jones <ajones@...tanamicro.com>, Samuel
 Holland <samuel.holland@...ive.com>, Anup Patel <anup@...infault.org>,
 linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
 linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, Anup Patel
 <apatel@...tanamicro.com>
Subject: Re: [RFC PATCH v2 11/17] irqchip: Add driver for the RISC-V RPMI
 system MSI service group

On Mon, Feb 03 2025 at 14:19, Anup Patel wrote:
> +
> +struct rpmi_sysmsi_priv {
> +	struct device *dev;
> +	struct mbox_client client;
> +	struct mbox_chan *chan;
> +	u32 nr_irqs;
> +	u32 gsi_base;
> +};

AS requested before please use tabular layout for structs:

https://www.kernel.org/doc/html/latest/process/maintainer-tip.html#struct-declarations-and-initializers

> +static int rpmi_sysmsi_set_msi_state(struct rpmi_sysmsi_priv *priv,
> +				     u32 sys_msi_index, u32 sys_msi_state)
> +{
> +	struct rpmi_sysmsi_set_msi_state_tx tx;
> +	struct rpmi_sysmsi_set_msi_state_rx rx;
> +	struct rpmi_mbox_message msg;
> +	int ret;
> +
> +	tx.sys_msi_index = sys_msi_index;
> +	tx.sys_msi_state = sys_msi_state;
> +	rpmi_mbox_init_send_with_response(&msg, RPMI_SYSMSI_SRV_SET_MSI_STATE,
> +					  &tx, sizeof(tx), &rx, sizeof(rx));
> +	ret = rpmi_mbox_send_message(priv->chan, &msg);
> +	if (ret)
> +		return ret;
> +	if (rx.status)
> +		return rpmi_to_linux_error(rx.status);
> +
> +	return 0;
> +}
> +
> +#define rpmi_sysmsi_mask(__priv, __msi_index)		\
> +	rpmi_sysmsi_set_msi_state(__priv, __msi_index, 0)
> +#define rpmi_sysmsi_unmask(__priv, __msi_index)		\
> +	rpmi_sysmsi_set_msi_state(__priv, __msi_index, RPMI_SYSMSI_MSI_STATE_ENABLE)

These macros are not really providing any value.

> +static void rpmi_sysmsi_irq_mask(struct irq_data *d)
> +{
> +	struct rpmi_sysmsi_priv *priv = irq_data_get_irq_chip_data(d);
> +	int ret;
> +
> +	ret = rpmi_sysmsi_mask(priv, d->hwirq);
> +	if (ret)
> +		dev_warn(priv->dev, "Failed to mask hwirq %d (error %d)\n",
> +			 (u32)d->hwirq, ret);

        if (ret) {
        	....
        }

https://www.kernel.org/doc/html/latest/process/maintainer-tip.html#bracket-rules

> +	irq_chip_mask_parent(d);
> +}

Other than those nits, this looks reasonable.

Thanks,

        tglx