linux-kernel - RE: 2.6.23.1 - sata_mv (7042) hang with large file operations

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Message-ID: <BD261180E6D35F4D9D32F3E44FD3D9010AB2D234@EMPBEDEX.empirix.com>
Date:	Fri, 16 Nov 2007 08:00:30 -0500
From:	"Morrison, Tom" <tmorrison@...irix.com>
To:	"Mark Lord" <liml@....ca>
Cc:	"Jeff Garzik" <jeff@...zik.org>, <linux-ide@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: RE: 2.6.23.1 - sata_mv (7042) hang with large file operations

This 'patch' did not work.

I tried setting the physical mem to just below the va addresses the
PEX is being assigned (0xea900000 (3753M) and everything works...

I set it to just above - and it gets miscellaneous boot problems....
like binfmt problems when attempting to insmod a module at boot time
("runaway loop modprobe binfmt_????" (?=I forgot to write down #) - this
was mem=3850M) or downright hanging after kernel has initialized and 
it says "freeing kernel memory" (i.e.: where it attempts to run init
on the root harddrive).

IMHO, this tells me that perhaps there is somewhere else in the sata_mv
code that is either modifying / accessing edma registers or something
like this - that just doesn't seem right!

I am going to try to port forward the driver that I know works and see
if there are still any problems...stay tuned!

Tom

-----Original Message-----
From: Mark Lord [mailto:liml@....ca] 
Sent: Thursday, November 15, 2007 5:14 PM
To: Morrison, Tom
Cc: Jeff Garzik; linux-ide@...r.kernel.org; linux-kernel@...r.kernel.org
Subject: Re: 2.6.23.1 - sata_mv (7042) hang with large file operations

Morrison, Tom wrote:
> The plot thickens - it looks like it might be some type 
> of problem interacting with the setup of my 4Gig DDR memory
> and how I setup some translation windows in my MPC8548E
> 
> I realized this morning that I have an inbound/ output PEX window
> Translation Setup for mapping all from/to PEX bus to outside 
> the physical 4GIG memory space (i.e.: up at 0xC_xxxx_xxxx). Thus,
> all output operations that translation from 0xC_xxxx_xxxx to 
> the pci 32 bit address of xxxx_xxxx) - and vice versa for for
> the inbound. Note: we also have a straight 1:1 translation mapping 
> as well for the lower 4Gig - so that's why this worked without
> the below mentioned change...
> 
> So, I changed the Request & Response Hi Addresses (which were
> Being shifted by 32 bits down anyways) and 'OR' that with my 
> 0xC (so the effective 64bit DMA address is 0xC_xxxx_xxxx (where 
> Xxxx_xxxx is the effective address). This was what we did to 
> solve the problem with the Marvel Linux driver that we got from
> the Marvel site....
> 
> This all works just fine with ONLY 2 gig of memory in the system
> (and still have these inbound/output pex translation windows), 
> but fails when I put back the 4 Gig (and the 8Gig) DDR memory.
> 
> Unfortunately, this still hasn't solved the problem though - 
> so there is something else which I am not seeing?
..

I don't know much about how 32-bit PPC deals with memory addresses
that are more than 32-bits..

But does this patch have any effect:


--- old/drivers/ata/sata_mv.c	2007-10-12 12:43:44.000000000 -0400
+++ linux/drivers/ata/sata_mv.c	2007-11-15 17:12:24.000000000 -0500
@@ -685,7 +685,7 @@
 {
 	int rc;
 
-	if (!pci_set_dma_mask(pdev, DMA_64BIT_MASK)) {
+	if (0 && !pci_set_dma_mask(pdev, DMA_64BIT_MASK)) {
 		rc = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK);
 		if (rc) {
 			rc = pci_set_consistent_dma_mask(pdev,
DMA_32BIT_MASK);
-
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