ada(4) and ahci(4) quirk printing

Steven Hartland killing at multiplay.co.uk
Tue Apr 23 11:32:55 UTC 2013


----- Original Message ----- 
From: "Alexander Motin" <mav at FreeBSD.org>
To: "Jeremy Chadwick" <jdc at koitsu.org>
Cc: "Kenneth Merry" <ken at freebsd.org>; <freebsd-stable at freebsd.org>
Sent: Tuesday, April 23, 2013 10:29 AM
Subject: Re: ada(4) and ahci(4) quirk printing


> On 23.04.2013 12:26, Jeremy Chadwick wrote:
>> On Tue, Apr 23, 2013 at 10:44:57AM +0300, Alexander Motin wrote:
>>> On 22.04.2013 08:14, Jeremy Chadwick wrote:
>>>> I've written the following patches and done the following testing (see
>>>> the results.*.txt files):
>>>>
>>>> http://jdc.koitsu.org/freebsd/quirk_printing/
>>>>
>>>> Important: these are against stable/9 r249715.
>>>>
>>>> Folks are welcome to try these; I've tested about as best as I can.
>>>>
>>>> Questions/comments for Alexander and Kenneth:
>>>>
>>>> 1. I'm not sure if the location of where I added the printf() code is
>>>> correct or not,
>>>
>>> It seems fine for me.
>>>
>>>> 2. Not sure if loader.conf(5) forced-quirks would show up here or not,
>>>
>>> As I see, they will.
>>>
>>>> 3. It would be nice to have the same for SCSI da(4).  I took a stab at
>>>> this but the printing code I wrote never got called (or the quirks entry
>>>> I added wasn't right, not sure which),
>>>>
>>>> 4. I strongly believe quirk printing should be shown *without* verbose
>>>> booting.  I say this because I noticed some of the CAPAB printf()s only
>>>> get shown if bootverbose is true.  In fact, it's what prompted me to
>>>> open PR 178040 ("My Intel 320 and 510-series SSDs don't show 4K quirks,
>>>> yet advertise 512 logical and physical in IDENTIFY?!  PR time!").
>>>
>>> Let me disagree. bootverbose keeps dmesg readable for average user,
>>> while quirks are specific driver workarounds and their names may
>>> confuse more then really help. If every driver print its quirks,
>>> dmesg would be two times bigger. There is bootverbose for it.
>>
>> I'm willing to bend on this assuming that userland has a way to display
>> the quirks.  I've already had one user contact me off-list stating that
>> displaying of quirks is useful to them, but *without* bootverbose
>> (because bootverbose shows too much information for them to have to sift
>> through).  And display of quirks (or in this case) was what prompted me
>> to create PR 178040, since I had just *assumed* FreeBSD had 4K quirks in
>> place for both models of SSDs.
>>
>> I think sysctl would be an ideal place for this.  Is it possible to
>> export active device quirks to sysctl (say kern.cam.ada.X.quirks),
>> read-only, and preferably as a string (same printf() style used)?  Or
>> does that introduce complexities?
>>
>> If we can't reach an agreement, I'm happy to wrap the relevant bits with
>> an "if (bootverbose)", but I really feel users should have some way to
>> see this information outside of bootverbose.
> 
> Both da and ada drivers already have sysctl's. It should be trivial to 
> add one more, especially if just numeric.

Wouldn't camcontrol be a better place for this?

    Regards
    Steve

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