linux-kernel - Re: [PATCH 2.6.32.3] ahci: AHCI and RAID mode SATA patch for Intel Cougar Point DeviceIDs

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Date:	Wed, 13 Jan 2010 08:59:31 -0600
From:	David Milburn <dmilburn@...hat.com>
To:	Jeff Garzik <jgarzik@...ox.com>
CC:	Robert Hancock <hancockrwd@...il.com>,
	Seth Heasley <seth.heasley@...el.com>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.32.3] ahci: AHCI and RAID mode SATA patch for Intel
 Cougar Point DeviceIDs

Jeff Garzik wrote:
> On 01/12/2010 11:40 PM, Robert Hancock wrote:
>> On 01/12/2010 07:00 PM, Seth Heasley wrote:
>>> This patch adds the Intel Cougar Point (PCH) SATA AHCI and RAID
>>> Controller DeviceIDs.
>>>
>>> Signed-off-by: Seth Heasley<seth.heasley@...el.com>
>>>
>>> --- linux-2.6.32.3/drivers/ata/ahci.c.orig 2010-01-06
>>> 15:07:45.000000000 -0800
>>> +++ linux-2.6.32.3/drivers/ata/ahci.c 2010-01-07 13:55:23.000000000 
>>> -0800
>>> @@ -560,6 +560,12 @@
>>> { PCI_VDEVICE(INTEL, 0x3b2b), board_ahci }, /* PCH RAID */
>>> { PCI_VDEVICE(INTEL, 0x3b2c), board_ahci }, /* PCH RAID */
>>> { PCI_VDEVICE(INTEL, 0x3b2f), board_ahci }, /* PCH AHCI */
>>> + { PCI_VDEVICE(INTEL, 0x1c02), board_ahci }, /* CPT AHCI */
>>> + { PCI_VDEVICE(INTEL, 0x1c03), board_ahci }, /* CPT AHCI */
>>> + { PCI_VDEVICE(INTEL, 0x1c04), board_ahci }, /* CPT RAID */
>>> + { PCI_VDEVICE(INTEL, 0x1c05), board_ahci }, /* CPT RAID */
>>> + { PCI_VDEVICE(INTEL, 0x1c06), board_ahci }, /* CPT RAID */
>>> + { PCI_VDEVICE(INTEL, 0x1c07), board_ahci }, /* CPT RAID */
>>>
>>> /* JMicron 360/1/3/5/6, match class to avoid IDE function */
>>> { PCI_VENDOR_ID_JMICRON, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
>>
>> The RAID mode entries would be needed if the device indicates RAID class
>> in that mode, but in plain AHCI mode it should indicate SATA AHCI class
>> which will get picked up by this catch-all so those entries shouldn't be
>> needed:
>>
>> /* Generic, PCI class code for AHCI */
>> { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
>> PCI_CLASS_STORAGE_SATA_AHCI, 0xffffff, board_ahci },
>>
>> Likely a lot of the existing specific PCI IDs could be removed from the
>> driver because of this (many likely predate the addition of the
>> class-based catch-all). The only reason to need a specific entry if the
>> device uses AHCI class is if it needs special handling or workarounds,
>> which isn't the case here.
> 
> Well, two lines of thinking here:
> 
> * some of lines of Intel chips do not separate AHCI into a separate PCI 
> ID rather legacy IDE interface.  When an AHCI interface exists and 
> AHCI/IDE share the same PCI ID, we default to using AHCI.  Thus, some of 
> those PCI ID matches in ahci.c's PCI table may not get caught by the 
> generic PCI class match at the end of the table.
> 
> * the cost carrying redundant PCI IDs seems low, harmless, and 
> potentially helpful.

It is helpful for the specific device IDs to show up in "modinfo ahci" and
modules.pcimap.

David

> 
> Comments welcome, though...
> 
>     Jeff
> 
> 
> 
> 
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