linux-kernel - Re: [PATCH v2 3/8] misc: amd-sbi: Add support for AMD

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Message-ID: <526b14e9-60f6-980a-35f5-37529591a1ab@amd.com>
Date: Mon, 22 Jul 2024 13:48:09 +0530
From: "Gupta, Akshay" <Akshay.Gupta@....com>
To: Greg KH <gregkh@...uxfoundation.org>
Cc: linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux@...ck-us.net, arnd@...db.de, naveenkrishna.chatradhi@....com
Subject: Re: [PATCH v2 3/8] misc: amd-sbi: Add support for AMD_SBI IOCTL


On 7/17/2024 2:14 PM, Greg KH wrote:
> Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.
>
>
> On Wed, Jul 17, 2024 at 08:10:22AM +0000, Akshay Gupta wrote:
>> +/* These are byte indexes into data_in and data_out arrays */
>> +#define RD_WR_DATA_INDEX     0
>> +#define REG_OFF_INDEX                0
>> +#define REG_VAL_INDEX                4
>> +#define RD_FLAG_INDEX                7
>> +
>> +#define MB_DATA_SIZE         4
> These are VERY badly named global defines for all of the kernel and
> userspace.  But most importantly, do you even need them here?  If so,
> please provide something sane.
>
These are required as used as-is by userspace. We will modify the names 
of the MACROS.

We will update the MACROS with AMD specific prefix.

>> +
>> +struct apml_message {
>> +     /* message ids:
>> +      * Mailbox Messages:    0x0 ... 0x999
>> +      */
>> +     __u32 cmd;
>> +
>> +     /*
>> +      * 8 bit data for reg read,
>> +      * 32 bit data in case of mailbox,
>> +      */
>> +     union {
>> +             __u32 mb_out[2];
>> +             __u8 reg_out[8];
>> +     } data_out;
>> +
>> +     /*
>> +      * [0]...[3] mailbox 32bit input
>> +      * [7] read/write functionality
>> +      */
>> +     union {
>> +             __u32 mb_in[2];
>> +             __u8 reg_in[8];
>> +     } data_in;
>> +} __attribute__((packed));
>> +
>> +/* ioctl command for mailbox msgs using generic _IOWR */
>> +#define AMD_SBI_BASE_IOCTL_NR        0xF9
>> +#define SBRMI_IOCTL_CMD              _IOWR(AMD_SBI_BASE_IOCTL_NR, 0, struct apml_message)
> Why is the ioctl command not prefixed with AMD_SBMI_BASE as well?
Existing APML library uses the "SBRMI_IOCTL_CMD", so will rename the 
AMD_SBI_BASE_IOCTL_NR to match with ioctl command.
>
> thanks,
>
> greg k-h

Do you want me to make these changes before you review the rest of the 
patches?

Thanks,

Akshay