Re: 6.0-CURRENT SNAP004 hangs on amr (patch)

From: Scott Long (scottl_at_samsco.org)
Date: 09/11/05

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    Date: Sat, 10 Sep 2005 23:12:01 -0600
To: "M. Warner Losh" <imp@bsdimp.com>

    M. Warner Losh wrote:
    > In message: <70e8236f05091016251510408c@mail.gmail.com>
    > Joao Barros <joao.barros@gmail.com> writes:
    > : Looking at pciconf -l -v :
    > : pcib3@pci2:0:0: class=0x060400 card=0x000000dc chip=0xb1548086 rev=0x00 hdr=0x01
    > : vendor = 'Intel Corporation'
    > : device = 'S21152BA,S21154AE/BE PCI to PCI Bridge'
    > : class = bridge
    > : subclass = PCI-PCI
    > : none1@pci2:1:0: class=0x010000 card=0x8493101e chip=0x12161077 rev=0x06 hdr=0x00
    > : vendor = 'QLogic Corporation'
    > : device = 'ISP12160 Dual Channel Ultra3 SCSI Processor'
    > : class = mass storage
    > : subclass = SCSI
    > : amr0@pci3:0:0: class=0x010400 card=0x04931028 chip=0x1960101e rev=0x20 hdr=0x00
    > : vendor = 'American Megatrends Inc.'
    > : device = '80960RP i960RP Microprocessor'
    > : class = mass storage
    > : subclass = RAID
    > :
    > : So, by not attaching a driver to pci2:1:0, the pci2:0:0 is disabled.
    > : Although the 'real' amr is assigned to pci3, the pci bridge on
    > : pci2:0:0 gets disabled thus killing the amr.
    >
    > One workaround less intrusive workaround would also be to add mass
    > storage devices to the list of devices that we don't power down by
    > default. That would catch all the cases that have been found to have
    > issues, as far as I can recall.
    >
    > Since these aren't functions in the same slot, it can be very hard to
    > know and recoginze this situation automatically. How do you tell it
    > apart from two devices on the same bus? You can't easily tell this.
    >
    > I have a few ideas here, and will look into them.
    >
    > Warner

    This will likely affect any intelligent I/O controller that is designed
    in this manner. This would include certain network controllers.

    Scott
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