linux-kernel - Re: [PATCH 5/9] soc: apple: Add RTKit IPC library

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Message-ID: <YjoGH2JYd7cvx844@rosenzweig.io>
Date:   Tue, 22 Mar 2022 17:23:43 +0000
From:   Alyssa Rosenzweig <alyssa@...enzweig.io>
To:     Sven Peter <sven@...npeter.dev>
Cc:     Hector Martin <marcan@...can.st>, Rob Herring <robh+dt@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Keith Busch <kbusch@...nel.org>,
        Jens Axboe <axboe@...com>, Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Marc Zyngier <maz@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-nvme@...ts.infradead.org
Subject: Re: [PATCH 5/9] soc: apple: Add RTKit IPC library

> +enum { APPLE_RTKIT_PWR_STATE_OFF = 0x00,
> +	APPLE_RTKIT_PWR_STATE_SLEEP = 0x01,
> +	APPLE_RTKIT_PWR_STATE_GATED = 0x02,
> +	APPLE_RTKIT_PWR_STATE_QUIESCED = 0x10,
> +	APPLE_RTKIT_PWR_STATE_ON = 0x20,
> +};

It would be great to get comments added explaining what these states
are. It's not obvious how off/sleep/gated/quiesced differ, and it's not
obvious from the code (doesn't look like GATED is used here at all?).
Are these Apple names or r/e'd names or a mix?

> +	if (!rtk->syslog_buffer.size) {
> +		rtk_warn(
> +			"received syslog message but syslog_buffer.size is zero");
> +		goto done;
> +	}
> +	if (!rtk->syslog_buffer.buffer && !rtk->syslog_buffer.iomem) {
> +		rtk_warn("received syslog message but no syslog_buffer.buffer or syslog_buffer.iomem");
> +		goto done;
> +	}

Nit: Wrapping is inconsistent between these two warns.