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

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Message-ID: <473CC4B8.4090607@rtr.ca>
Date:	Thu, 15 Nov 2007 17:14:16 -0500
From:	Mark Lord <liml@....ca>
To:	"Morrison, Tom" <tmorrison@...irix.com>
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

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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