linux-kernel - Re: [PATCH] hpsa: add heartbeat sysfs host attribute

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Date:	Mon, 15 Aug 2011 08:45:28 -0700
From:	Greg KH <greg@...ah.com>
To:	scameron@...rdog.cce.hp.com
Cc:	james.bottomley@...senpartnership.com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, stephenmcameron@...il.com,
	thenzl@...hat.com, akpm@...ux-foundation.org,
	mikem@...rdog.cce.hp.com
Subject: Re: [PATCH] hpsa: add heartbeat sysfs host attribute

On Mon, Aug 15, 2011 at 10:04:09AM -0500, scameron@...rdog.cce.hp.com wrote:
> On Mon, Aug 15, 2011 at 09:40:22AM -0500, scameron@...rdog.cce.hp.com wrote:
> > On Fri, Aug 12, 2011 at 07:01:47PM -0700, Greg KH wrote:
> > > On Fri, Aug 12, 2011 at 01:03:14PM -0500, Stephen M. Cameron wrote:
> > > > From: Stephen M. Cameron <scameron@...rdog.cce.hp.com>
> > > > 
> > > > The cciss driver had a CCISS_HEARTBEAT ioctl which
> > [...]
> > > >  
> > > > +  The "heartbeat" read-only attribute returns the value of a heartbeat
> > > > +  counter register on a Smart Array controller as a 32 bit unsigned
> > > > +  hexadecimal integer (e.g: "0x12345678").  The value should change
> > > > +  periodically, not less than once per second.  If this value fails to
> > > > +  change for a period longer than one second, it means something has
> > > > +  gone wrong (e.g. Smart Array controller firmware has locked up.)
> > > > +
> > > 
> > > This all belongs in Documentation/ABI/ care to move it there instead?
> > 
> > Sure.
> 
> Now that I look, I'm not seeing where any of the generic scsi
> host or device attributes are documented in Documenation/ABI.

Then that's a SCSI bug :)

> It's not very clear to me where in Documentation/ABI I should
> document a driver's custom scsi device and host attributes as
> even the generic scsi device and host attributes seem to be
> undocumented.
> 
> from scsi_sysfs.c, I see these, for example:
> 
>         &dev_attr_device_blocked.attr,
>         &dev_attr_type.attr,
>         &dev_attr_scsi_level.attr,
>         &dev_attr_vendor.attr,
>         &dev_attr_model.attr,
>         &dev_attr_rev.attr,
>         &dev_attr_rescan.attr,
>         &dev_attr_delete.attr,
>         &dev_attr_state.attr,
>         &dev_attr_timeout.attr,
>         &dev_attr_iocounterbits.attr,
>         &dev_attr_iorequest_cnt.attr,
>         &dev_attr_iodone_cnt.attr,
>         &dev_attr_ioerr_cnt.attr,
>         &dev_attr_modalias.attr,
>         REF_EVT(media_change),
>         NULL
> };
> 
> but I don't see them documented anywhere in Documentation/ABI,
> and hpsa.c adds these custom sdev attrs:
> 
> static struct device_attribute *hpsa_sdev_attrs[] = {
>         &dev_attr_raid_level,
>         &dev_attr_lunid,
>         &dev_attr_unique_id,
>         NULL,
> };
> 
> 
> Likewise, there are generic scsi host attrs in scsi_sysfs.c:
> 
> static struct attribute *scsi_sysfs_shost_attrs[] = {
>         &dev_attr_unique_id.attr,
>         &dev_attr_host_busy.attr,
>         &dev_attr_cmd_per_lun.attr,
>         &dev_attr_can_queue.attr,
>         &dev_attr_sg_tablesize.attr,
>         &dev_attr_sg_prot_tablesize.attr,
>         &dev_attr_unchecked_isa_dma.attr,
>         &dev_attr_proc_name.attr,
>         &dev_attr_scan.attr,
>         &dev_attr_hstate.attr,
>         &dev_attr_supported_mode.attr,
>         &dev_attr_active_mode.attr,
>         &dev_attr_prot_capabilities.attr,
>         &dev_attr_prot_guard_type.attr,
>         NULL
> 
> Also undocumented.
> 
> hpsa.c adds custom host attrs:
> static struct device_attribute *hpsa_shost_attrs[] = {
>         &dev_attr_rescan,
>         &dev_attr_firmware_revision,
>         &dev_attr_commands_outstanding,
>         &dev_attr_transport_mode,
>         &dev_attr_resettable,
>         &dev_attr_heartbeat,
>         NULL,
> };
> 
> 
> How should I proceed?

Start by documenting the ones you add, and if you want, and can, it
would be great to document the existing ones as well.

thanks,

greg k-h
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