Hi Yijing, Thanks for your information, that's what I'm looking for! -Aaron -----Original Message----- From: Yijing Wang [mailto:wangyijing@xxxxxxxxxx] Sent: 2014年10月10日 9:39 To: Wei, Aaron; linux-pci@xxxxxxxxxxxxxxx Subject: Re: A question about PCI device rescan On 2014/10/9 18:50, Wei, Aaron wrote: > Hi, > > Could someone help explain why writing to "rescan" under "/sys/bus/pci/devices/.../rescan" will force a rescan of the device's parent bus instead of just re-discover all the devices behind this device (if the device is type-0, then nothing happens). > > Is there any user space interface that could let user just rescan devices behind one specified type-1 device? You can use pci_bus rescan which is placed under the pci_bus, i.e. \-[0000:00]-+-00.0 Intel Corporation 5520/5500/X58 I/O Hub to ESI Port +-01.0-[0000:01-02]--+-00.0 Intel Corporation 82576 Gigabit Network Connection | \-00.1 Intel Corporation 82576 Gigabit Network Connection If you want to rescan devices behind 00:01.0(root port), echo 1 > /sys/bus/pci/devices/0000:00:01.0/pci_bus/0000:01/rescan Then it will only rescan the subordinate pci bus. > > Thanks, > Aaron > > -- > To unsubscribe from this list: send the line "unsubscribe linux-pci" > in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo > info at http://vger.kernel.org/majordomo-info.html > > -- Thanks! Yijing ?韬{.n?????%??檩??w?{.n???{炳???骅w* jg????????G??⒏ ⒎?:+v???????? ????＂??????
