linux-kernel - Re: [PATCH] ahci: Extend ASM1061 43-bit DMA address quirk to other ASM106x parts

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Message-ID: <2d111b04-4307-4f47-b3a4-208f571d04a8@kernel.org>
Date: Tue, 30 Jan 2024 21:26:32 +0900
From: Damien Le Moal <dlemoal@...nel.org>
To: Lennert Buytenhek <kernel@...tstofly.org>
Cc: Niklas Cassel <cassel@...nel.org>, linux-ide@...r.kernel.org,
 linux-kernel@...r.kernel.org, Robin Murphy <robin.murphy@....com>,
 John Garry <john.g.garry@...cle.com>, Joerg Roedel <jroedel@...e.de>,
 Szuying Chen <chensiying21@...il.com>, Jesse1_Chang@...edia.com.tw,
 Richard_Hsu@...edia.com.tw, Chloe_Chen@...edia.com.tw
Subject: Re: [PATCH] ahci: Extend ASM1061 43-bit DMA address quirk to other
 ASM106x parts

On 1/30/24 20:59, Lennert Buytenhek wrote:
> On Tue, Jan 30, 2024 at 08:46:23PM +0900, Damien Le Moal wrote:
> 
>>> ASMedia have confirmed that all ASM106x parts currently listed in
>>> ahci_pci_tbl[] suffer from the 43-bit DMA address limitation that we ran
>>> into on the ASM1061, and therefore, we need to apply the quirk added by
>>> commit 20730e9b2778 to the other supported ASM106x parts as well.
>>>
>>> Signed-off-by: Lennert Buytenhek <kernel@...tstofly.org>
>>
>> I think this needs a cc: stable tag.
> 
> The commit that is likely responsible for surfacing this issue is
> 791c2b17fb40 which went into v6.6 -- so would this then be appropriate,
> or do you think this should be backported to older versions as well?

Hmmm... given this is a hardware "bug", it seems safer to backport to all stable
& lts. From what I understand, the device may be doing bad DMA, regardless of
what the iommu is doing. Niklas ? you followed this more carefully than I did :)

> 
> Cc: stable@...r.kernel.org # 6.6.x
> 
> 
>>> ---
>>>  drivers/ata/ahci.c | 10 +++++-----
>>>  1 file changed, 5 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
>>> index d2460fa985b7..da2e74fce2d9 100644
>>> --- a/drivers/ata/ahci.c
>>> +++ b/drivers/ata/ahci.c
>>> @@ -606,13 +606,13 @@ static const struct pci_device_id ahci_pci_tbl[] = {
>>>  	{ PCI_VDEVICE(PROMISE, 0x3781), board_ahci },   /* FastTrak TX8660 ahci-mode */
>>>  
>>>  	/* ASMedia */
>>> -	{ PCI_VDEVICE(ASMEDIA, 0x0601), board_ahci },	/* ASM1060 */
>>> -	{ PCI_VDEVICE(ASMEDIA, 0x0602), board_ahci },	/* ASM1060 */
>>> +	{ PCI_VDEVICE(ASMEDIA, 0x0601), board_ahci_43bit_dma },	/* ASM1060 */
>>> +	{ PCI_VDEVICE(ASMEDIA, 0x0602), board_ahci_43bit_dma },	/* ASM1060 */
>>>  	{ PCI_VDEVICE(ASMEDIA, 0x0611), board_ahci_43bit_dma },	/* ASM1061 */
>>>  	{ PCI_VDEVICE(ASMEDIA, 0x0612), board_ahci_43bit_dma },	/* ASM1061/1062 */
>>> -	{ PCI_VDEVICE(ASMEDIA, 0x0621), board_ahci },   /* ASM1061R */
>>> -	{ PCI_VDEVICE(ASMEDIA, 0x0622), board_ahci },   /* ASM1062R */
>>> -	{ PCI_VDEVICE(ASMEDIA, 0x0624), board_ahci },   /* ASM1062+JMB575 */
>>> +	{ PCI_VDEVICE(ASMEDIA, 0x0621), board_ahci_43bit_dma },	/* ASM1061R */
>>> +	{ PCI_VDEVICE(ASMEDIA, 0x0622), board_ahci_43bit_dma },	/* ASM1062R */
>>> +	{ PCI_VDEVICE(ASMEDIA, 0x0624), board_ahci_43bit_dma },	/* ASM1062+JMB575 */
>>>  	{ PCI_VDEVICE(ASMEDIA, 0x1062), board_ahci },	/* ASM1062A */
>>>  	{ PCI_VDEVICE(ASMEDIA, 0x1064), board_ahci },	/* ASM1064 */
>>>  	{ PCI_VDEVICE(ASMEDIA, 0x1164), board_ahci },   /* ASM1164 */

-- 
Damien Le Moal
Western Digital Research