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

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Date:	Fri, 12 Aug 2011 19:01:47 -0700
From:	Greg KH <greg@...ah.com>
To:	"Stephen M. Cameron" <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 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
> was not implemented in hpsa.  This ioctl returned a
> counter from a register on the Smart Array which the
> firmware would periodically update.  It can be used
> to detect certain kinds of faults (e.g. controller
> lockup) by noticing when the value remains constant
> for more than a second or two.
> 
> Signed-off-by: Stephen M. Cameron <scameron@...rdog.cce.hp.com>
> ---
>  Documentation/scsi/hpsa.txt |    8 ++++++++
>  drivers/scsi/hpsa.c         |   18 ++++++++++++++++++
>  2 files changed, 26 insertions(+), 0 deletions(-)
> 
> diff --git a/Documentation/scsi/hpsa.txt b/Documentation/scsi/hpsa.txt
> index 891435a..0dac1e0 100644
> --- a/Documentation/scsi/hpsa.txt
> +++ b/Documentation/scsi/hpsa.txt
> @@ -47,6 +47,7 @@ HPSA specific entries in /sys
>    /sys/class/scsi_host/host*/firmware_revision
>    /sys/class/scsi_host/host*/resettable
>    /sys/class/scsi_host/host*/transport_mode
> +  /sys/class/scsi_host/host*/heartbeat
>  
>    the host "rescan" attribute is a write only attribute.  Writing to this
>    attribute will cause the driver to scan for new, changed, or removed devices
> @@ -78,6 +79,13 @@ HPSA specific entries in /sys
>    kexec tools to warn the user if they attempt to designate a device which is
>    unable to honor the reset_devices kernel parameter as a dump device.
>  
> +  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?

greg k-h
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