Date: Sat, 10 Sep 2005 23:12:01 -0600 From: Scott Long <scottl@samsco.org> To: "M. Warner Losh" <imp@bsdimp.com> Cc: joao.barros@gmail.com, freebsd-current@freebsd.org, mike@sentex.net Subject: Re: 6.0-CURRENT SNAP004 hangs on amr (patch) Message-ID: <4323BCA1.7000708@samsco.org> In-Reply-To: <20050910.212938.106824122.imp@bsdimp.com> References: <70e8236f05090513381584dda0@mail.gmail.com> <70e8236f0509051350e020f76@mail.gmail.com> <70e8236f05091016251510408c@mail.gmail.com> <20050910.212938.106824122.imp@bsdimp.com>
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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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