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Date: Tue, 6 Mar 2012 22:29:46 -0800 From: Yinghai Lu <yinghai@...nel.org> To: Bjorn Helgaas <bjorn.helgaas@...il.com> Cc: Bjorn Helgaas <bhelgaas@...gle.com>, Jesse Barnes <jbarnes@...tuousgeek.org>, x86 <x86@...nel.org>, linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 23/23] x86, PCI: add pcibios_root_rescan On Tue, Mar 6, 2012 at 7:49 PM, Bjorn Helgaas <bjorn.helgaas@...il.com> wrote: >> my sandbridge system has cpu bus 0x7f, and 0xff in DSDT. >> >> but nehalem and westmere system does not have cpu bus 0xf8, ... 0xff. > > I think you're saying that on some machines, the BIOS decided not to > expose host bridges leading to CPU devices, and you want to discover > those devices anyway. (What's the reason you want to discover them?) current code for mmconf will set pcibios_last_bios according to mmconf bus range. so it legacy peer root bus fix up will discover those cpu buses. then if some one remove them through echo 1 > /sys/devices/pci0000:ff/pci_bus/0000:ff/remove then echo 1 > /sys/bus/pci/rescan_root will not recover those cpu buses without this patch. Yinghai -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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