linux-kernel - Re: [PATCH arm/aspeed/ast2500 v1] ipmi: add an Aspeed KCS IPMI BMC driver

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Message-ID: <2fd6d4d7-39a1-f1b5-752e-e43ae2dd4cdd@linux.intel.com>
Date:   Thu, 18 Jan 2018 08:16:46 +0800
From:   "Wang, Haiyue" <haiyue.wang@...ux.intel.com>
To:     minyard@....org, joel@....id.au, openbmc@...ts.ozlabs.org,
        openipmi-developer@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Cc:     andriy.shevchenko@...el.com
Subject: Re: [PATCH arm/aspeed/ast2500 v1] ipmi: add an Aspeed KCS IPMI BMC
 driver



On 2018-01-17 23:59, Corey Minyard wrote:
> On 01/17/2018 08:31 AM, Wang, Haiyue wrote:
>>
>>
>> On 2018-01-17 06:12, Corey Minyard wrote:
>>> On 01/16/2018 02:59 PM, Corey Minyard wrote:
>>>> On 01/16/2018 05:43 AM, Haiyue Wang wrote:
>>>>> The KCS (Keyboard Controller Style) interface is used to perform 
>>>>> in-band
>>>>> IPMI communication between a server host and its BMC (BaseBoard 
>>>>> Management
>>>>> Controllers).
>>>>>
>>>>> This driver exposes the KCS interface on ASpeed SOCs (AST2400 and 
>>>>> AST2500)
>>>>> as a character device. Such SOCs are commonly used as BMCs and 
>>>>> this driver
>>>>> implements the BMC side of the KCS interface.
>>>>
>>>> I thought we were going to unify the BMC ioctl interface? My 
>>>> preference would be to
>>>> create a file named include/uapi/linux/ipmi-bmc.h and add the 
>>>> following:
>>>>
>>>> #define __IPMI_BMC_IOCTL_MAGIC    0xb1
>>>> #define IPMI_BMC_IOCTL_SMS_SET_ATN _IO(__IPMI_BMC_IOCTL_MAGIC, 0x00)
>>>>
>>>> to make it the same as BT.  Then in bt-bmc.h, set 
>>>> BT_BMC_IOCTL_SMS_ATN to
>>>> IPMI_BMC_IOCTL_SMS_SET_ATN.  Then add the KCS ioctls in ipmi-bmc.h and
>>>> use that.  That way we stay backward compatible but we are unified.
>>>>
>>>> Since more KCS interfaces may come around, can you make the name more
>>>> specific?  (I made this same error on bt-bmc,c, it should probably 
>>>> be renamed.)
>>>>
>> How about these IOCTL definitions ? Is it more specific ?
>>
>> #define IPMI_BMC_IOCTL_SET_SMS_ATN _IO(__IPMI_BMC_IOCTL_MAGIC, 0x00)
>> #define IPMI_BMC_IOCTL_CLEAR_SMS_ATN _IO(__IPMI_BMC_IOCTL_MAGIC, 0x01)
>> #define IPMI_BMC_IOCTL_FORCE_ABORT _IO(__IPMI_BMC_IOCTL_MAGIC, 0x02)
>>
>
> Those look good to me.  If you could do the switchover to ipmi-bmc.h 
> in a separate
> patch, that would be cleaner.  Then add the clear atn and force abort 
> ioctls in the
> patch to add the new driver.
>
> Sound good?
>
> -corey
>
If I understood correctly, still use KCS_BMC_IOCTL_xxx in kcs_bmc.h 
currently, then add a
patch for ipmi-bmc.h, and modify the bt_bmc.h together. Right ?

Haiyue