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Message-ID: <5767b9100612191952o593a4c48w50f0d483533a3a09@mail.gmail.com>
Date: Wed, 20 Dec 2006 11:52:44 +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, 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
>
or, pls see this one:
------------------------
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 11:45:45.000000000 +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_AHCI, 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 11:45:07.000000000 +0800
@@ -15,6 +15,8 @@
#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_SATA_AHCI 0x010601
#define PCI_CLASS_STORAGE_SAS 0x0107
#define PCI_CLASS_STORAGE_OTHER 0x0180
BTW, the 2 patches above are just my suggestion, not formal patch. If
either of them is acceptible, I will send out a formal patch. Thanks!
Conke
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