linux-kernel - Re: Questions on PCI express AER support in HBA driver

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Message-ID: <20070118235632.GA7860@austin.ibm.com>
Date:	Thu, 18 Jan 2007 17:56:33 -0600
From:	linas@...tin.ibm.com (Linas Vepstas)
To:	Allexio Ju <allexio.ju@...il.com>
Cc:	linux-pci@...ey.karlin.mff.cuni.cz, linux-kernel@...r.kernel.org
Subject: Re: Questions on PCI express AER support in HBA driver

On Thu, Jan 18, 2007 at 11:46:21AM -0800, Allexio Ju wrote:
> Hi,
> 
> I've got some questions on supporting PCI Express AER in Linux HBA drivers.
> BTW, I'm developing SCSI HBA driver.
[...]

> What else does SCSI LLD driver need to changed?

There are several scsi controllers that handle pci error recovery.
For example, look at drivers/scsi/ipr.c, search for 
struct pci_error_handlers. The callback routines there deal
with reseting the driver after an error has been found.

I've posted patches in the past for the symbios driver;
I suppose it is time to clean them up and resubmit them
again; they are not in the kernel yet.

I recently posted patches for the Emulex lpfc fibre channel 
scsi card, google for the subject line
  "[PATCH] lpfc: add PCI error recovery support"

to see what the patch looks like.

All of this work was done on powerpc systems. I have only
a vague idea of how this works on PC-class Intel platforms.

--linas

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