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Message-ID: <5767b9100612191941n461f2b39k93d2cec43a31205a@mail.gmail.com>
Date: Wed, 20 Dec 2006 11:41:26 +0800
From: "Conke Hu" <conke.hu@...il.com>
To: "Jeff Garzik" <jeff@...zik.org>, Alan <alan@...rguk.ukuu.org.uk>,
"Andrew Morton" <akpm@...l.org>
Cc: "Linux kernel mailing list" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Add pci class code for SATA
On 12/20/06, Conke Hu <conke.hu@...il.com> wrote:
> On 12/20/06, Jeff Garzik <jeff@...zik.org> wrote:
> > Conke Hu wrote:
> > > Add pci class code 0x0106 for SATA to pci_ids.h
> > >
> > > signed-off-by: conke.hu@...il.com
> > > --------------------
> > > --- linux-2.6.20-rc1/include/linux/pci_ids.h.orig 2006-12-20
> > > 01:58:30.000000000 +0800
> > > +++ linux-2.6.20-rc1/include/linux/pci_ids.h 2006-12-20
> > > 01:59:07.000000000 +0800
> > > @@ -15,6 +15,7 @@
> > > #define PCI_CLASS_STORAGE_FLOPPY 0x0102
> > > #define PCI_CLASS_STORAGE_IPI 0x0103
> > > #define PCI_CLASS_STORAGE_RAID 0x0104
> > > +#define PCI_CLASS_STORAGE_SATA 0x0106
> > > #define PCI_CLASS_STORAGE_SAS 0x0107
> > > #define PCI_CLASS_STORAGE_OTHER 0x0180
> >
> > Two comments:
> >
> > 1) I think "_SATA" is an inaccurate description. It should be _AHCI AFAICS.
> >
> > 2) Typically we don't add constants unless they are used somewhere...
> >
> > Jeff
> >
>
> Hi Jeff,
> According to PCI spec 3.0, 0x0106 means SATA controller, 0x010601
> means AHCI and 0x010600 means vendor specific SATA controller. Pls see
> the following table (PCI spec 3.0 P296):
>
> Base Class Sub-Class Interface Meaning
> --------------------------------------------------------
> 00h 00h SCSI bus controller
> ------------------------------------------------
> 01h xxh IDE controller
> -----------------------------------------------
> 02h 00h Floppy disk controller
> -----------------------------------------------------
> 03h 00h IPI bus controller
> --------------------------------------------------
> 04h 00h RAID controller
> 01h ------------------------------------------------
> 20h ATA controller with ADMA interface
> 05h ---------------------------------------------------
> 30h ATA controller with ADMA interface
> -------------------------------------------------------------------
> 00h Serial ATA controller–vendor specific interface
> 06h -----------------------------------------------------------------
> 01h Serial ATA controller–AHCI 1.0 interface
> -------------------------------------------------------------------------
> 07h 00h Serial Attached SCSI (SAS) controller
> ---------------------------------------------------------------------
> 80h 00h Other mass storage controller
> ------------------------------------------------------------------------------
>
>
> So, I think, the following macro is correct:
> #define PCI_CLASS_STORAGE_SATA 0x0106
> If you would define AHCI class code, it should be 0x010601, not 0x0106:
> #define PCI_CLASS_STORAGE_SATA_AHCI 0x010601
>
> And, I think that PCI_CLASS_STORAGE_SATA had better be added to
> pci_ids.h since the class code 0x0106 is used more than once. e.g.
> ahci.c uses the magic number 0x0106 twice, and it might be used more
> in future.
>
> Best regards,
> Conke
>
Here is a patch to show more details:
-----------------------------------
diff -Nur linux-2.6.20-rc1.orig/drivers/ata/ahci.c
linux-2.6.20-rc1/drivers/ata/ahci.c
--- linux-2.6.20-rc1.orig/drivers/ata/ahci.c 2006-12-20 10:25:00.000000000 +0800
+++ linux-2.6.20-rc1/drivers/ata/ahci.c 2006-12-20 10:13:24.000000000 +0800
@@ -418,7 +418,7 @@
/* Generic, PCI class code for AHCI */
{ PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
- 0x010601, 0xffffff, board_ahci },
+ PCI_CLASS_STORAGE_SATA<<8|1, 0xffffff, board_ahci },
{ } /* terminate list */
};
@@ -1586,11 +1586,11 @@
speed_s = "?";
pci_read_config_word(pdev, 0x0a, &cc);
- if (cc == 0x0101)
+ if (cc == PCI_CLASS_STORAGE_IDE)
scc_s = "IDE";
- else if (cc == 0x0106)
+ else if (cc == PCI_CLASS_STORAGE_SATA)
scc_s = "SATA";
- else if (cc == 0x0104)
+ else if (cc == PCI_CLASS_STORAGE_RAID)
scc_s = "RAID";
else
scc_s = "unknown";
diff -Nur linux-2.6.20-rc1.orig/include/linux/pci_ids.h
linux-2.6.20-rc1/include/linux/pci_ids.h
--- linux-2.6.20-rc1.orig/include/linux/pci_ids.h 2006-12-20
10:24:51.000000000 +0800
+++ linux-2.6.20-rc1/include/linux/pci_ids.h 2006-12-20 10:08:15.000000000 +0800
@@ -15,6 +15,7 @@
#define PCI_CLASS_STORAGE_FLOPPY 0x0102
#define PCI_CLASS_STORAGE_IPI 0x0103
#define PCI_CLASS_STORAGE_RAID 0x0104
+#define PCI_CLASS_STORAGE_SATA 0x0106
#define PCI_CLASS_STORAGE_SAS 0x0107
#define PCI_CLASS_STORAGE_OTHER 0x018
-
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