linux-kernel - Re: [PATCH v6,4/4] drivers: misc: new driver sram

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Message-ID: <CAK8P3a0-7mLhGb=LCAQSTL4kNoGVcBcQOca=-tJkZAj1w2Bxsg@mail.gmail.com>
Date:   Sat, 18 Apr 2020 21:11:06 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Wang Wenhu <wenhu.wang@...o.com>
Cc:     gregkh <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Scott Wood <oss@...error.net>,
        christophe leroy <christophe.leroy@....fr>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>, kernel@...o.com,
        Randy Dunlap <rdunlap@...radead.org>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH v6,4/4] drivers: misc: new driver sram_uapi for user level
 SRAM access

On Sat, Apr 18, 2020 at 6:22 PM Wang Wenhu <wenhu.wang@...o.com> wrote:
> +#define DRIVER_NAME    "sram_uapi"
> +
> +#define SRAM_UAPI_IOCTL_SET_SRAM_TYPE  0
> +#define SRAM_UAPI_IOCTL_ALLOC          1
> +#define SRAM_UAPI_IOCTL_FREE           2
> +
> +struct res_info {
> +       u32 offset;
> +       u32 size;
> +};

This is of course not a proper ioctl interface at all, please see
Documentation/driver-api/ioctl.rst for how to define the numbers
in a uapi header file.

The offset/size arguments should probably be 64 bit wide.

       Arnd