linux-kernel - Re: [PATCH 13/14] Documentation/ABI: Update IFS ABI doc

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Date:   Wed, 2 Nov 2022 15:10:30 -0700
From:   "Joseph, Jithu" <jithu.joseph@...el.com>
To:     Sohil Mehta <sohil.mehta@...el.com>, <hdegoede@...hat.com>,
        <markgross@...nel.org>
CC:     <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
        <dave.hansen@...ux.intel.com>, <x86@...nel.org>, <hpa@...or.com>,
        <gregkh@...uxfoundation.org>, <ashok.raj@...el.com>,
        <tony.luck@...el.com>, <linux-kernel@...r.kernel.org>,
        <platform-driver-x86@...r.kernel.org>, <patches@...ts.linux.dev>,
        <ravi.v.shankar@...el.com>, <thiago.macieira@...el.com>,
        <athenas.jimenez.gonzalez@...el.com>
Subject: Re: [PATCH 13/14] Documentation/ABI: Update IFS ABI doc



On 11/1/2022 3:59 PM, Sohil Mehta wrote:
> On 11/1/2022 3:48 PM, Joseph, Jithu wrote:
>> The testname would be inferred based the sysfs file context (the<N> in /sys/devices/virtual/misc/intel_ifs_<N>/current_batch) from which the operation is triggered.
>>
>> Meaning if the user writes to /sys/devices/virtual/misc/intel_ifs_0/current_batch it would look for ff-mm-ss.scan and if they write to
>> /sys/devices/virtual/misc/intel_ifs_2/current_batch  it would look for ff-mm-ss.<test_type_2>
>>
> 
> So intel_ifs_<N> corresponds to <test_type> i.e. intel_ifs_0 maps to .scan
> 
> Is the N to test_type mapping visible to the user somewhere? If not, how would the user infer that?
> 
> Would it be useful to name the misc device as intel_ifs_<test_type>?
> 

There is a mapping based on the device number, for e.g if the user tries to use the below sysfs file for loading
/sys/devices/virtual/misc/intel_ifs_<N>/current_batch

The driver will look for the below test image for loading
/lib/firmware/intel/ifs_<N>/ff-mm-ss-02x.<test_type>

The number<N> is same in both the above path.
Prior to issuing the load command, user has to simply copy the supplied test image to the corresponding /lib/firmware path

Jithu