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    SubjectRE: Q: state of pci express hotplug
    Date

    > Kenji Kaneshige wrote:
    > (1) Build all your hotplug drivers as kernel modules.
    > (2) Modprobe hotplug drivers one by one, and check which drivers add
    > directories under /sys/bus/pci/slots. Before trying the next driver,
    > please rmmod the previous driver, because there are hotplug slots
    > that can be managed by the several drivers. Note that you don't need
    > to try fakephp this time.
    >

    Thanks much for the exact steps. Here are the results (with 2.6.25 and 2.6.28.3 ). Pls let me know if you want me to run them on a different branch or other steps.

    with 2.6.25-14
    -------------------

    Built the kernel with these options:-

    CONFIG_HOTPLUG_PCI=y
    CONFIG_HOTPLUG_PCI_FAKE=m
    CONFIG_HOTPLUG_PCI_ACPI=m
    CONFIG_HOTPLUG_PCI_ACPI_IBM=m
    # CONFIG_HOTPLUG_PCI_CPCI is not set
    CONFIG_HOTPLUG_PCI_SHPC=m

    # uname -a
    Linux localhost.localdomain 2.6.25-14.fc9.x86_64.kkhp #4 SMP Tue Feb 3 11:12:07 PST 2009 x86_64 x86_64 x86_64 GNU/Linux


    [root@localhost linux-2.6.25.x86_64]#ls -lt /sys/bus/pci/slots
    total 0
    [root@localhost linux-2.6.25.x86_64]# /sbin/modprobe acpiphp
    [root@localhost linux-2.6.25.x86_64]# ls -lt /sys/bus/pci/slots
    total 0
    drwxr-xr-x 2 root root 0 2009-02-03 11:32 2
    [root@localhost linux-2.6.25.x86_64]# /sbin/rmmod acpiphp
    [root@localhost linux-2.6.25.x86_64]# ls -lt /sys/bus/pci/slots
    total 0
    [root@localhost linux-2.6.25.x86_64]# /sbin/modprobe pciehp
    [root@localhost linux-2.6.25.x86_64]# ls -lt /sys/bus/pci/slots
    total 0
    drwxr-xr-x 2 root root 0 2009-02-03 11:33 0009_0096
    [root@localhost linux-2.6.25.x86_64]# /sbin/rmmod pciehp
    [root@localhost linux-2.6.25.x86_64]# /sbin/modprobe shpchp
    [root@localhost linux-2.6.25.x86_64]# ls -lt /sys/bus/pci/slots
    total 0

    with 2.6.28.3
    ---------------

    build with options
    CONFIG_HOTPLUG_PCI=y
    CONFIG_HOTPLUG_PCI_FAKE=m
    CONFIG_HOTPLUG_PCI_ACPI=m
    CONFIG_HOTPLUG_PCI_ACPI_IBM=m
    # CONFIG_HOTPLUG_PCI_CPCI is not set
    CONFIG_HOTPLUG_PCI_SHPC=m


    # uname -a
    Linux localhost.localdomain 2.6.28.3 #1 SMP Tue Feb 3 16:51:23 PST 2009 x86_64 x86_64 x86_64 GNU/Linux


    #ls -lt /sys/bus/pci/slots
    total 0
    # /sbin/modprobe acpiphp
    # ls -lt /sys/bus/pci/slots
    total 0
    drwxr-xr-x 2 root root 0 2009-02-03 18:15 2

    ## /var/log/messages contains following messages
    Feb 3 18:15:06 localhost kernel: acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5
    Feb 3 18:15:06 localhost kernel: acpiphp: Slot [2] registered

    # /sbin/rmmod acpiphp
    # ls -lt /sys/bus/pci/slots
    total 0
    # /sbin/modprobe pciehp
    # ls -lt /sys/bus/pci/slots
    total 0
    drwxr-xr-x 2 root root 0 2009-02-03 18:19 96

    /var/log/messages:-
    Feb 3 18:19:35 localhost kernel: pciehp 0000:00:09.0:pcie02: Link Active Reporting supported
    Feb 3 18:19:36 localhost kernel: pciehp 0000:00:09.0:pcie02: Command not completed in 1000 msec
    Feb 3 18:19:36 localhost kernel: pciehp 0000:00:09.0:pcie02: HPC vendor_id 8086 device_id 3410 ss_vid 0 ss_did 0
    Feb 3 18:19:37 localhost kernel: pciehp 0000:00:09.0:pcie02: Command not completed in 1000 msec
    Feb 3 18:19:37 localhost kernel: pciehp 0000:00:09.0:pcie02: Registering domain:bus:dev=0000:09:00 hp_slot=0 sun=60 slot_device_offset=0
    Feb 3 18:19:37 localhost kernel: pciehp 0000:00:09.0:pcie02: get_power_status: physical_slot = 96
    Feb 3 18:19:37 localhost kernel: pciehp 0000:00:09.0:pcie02: hpc_get_power_status: SLOTCTRL a8 value read 7bf
    Feb 3 18:19:37 localhost kernel: pciehp 0000:00:09.0:pcie02: get_attention_status: physical_slot = 96
    Feb 3 18:19:37 localhost kernel: pciehp 0000:00:09.0:pcie02: hpc_get_attention_status: SLOTCTRL a8, value read 7bf
    Feb 3 18:19:37 localhost kernel: pciehp 0000:00:09.0:pcie02: get_latch_status: physical_slot = 96
    Feb 3 18:19:37 localhost kernel: pciehp 0000:00:09.0:pcie02: get_adapter_status: physical_slot = 96
    Feb 3 18:19:37 localhost kernel: pciehp: PCI Express Hot Plug Controller Driver version: 0.4

    # /sbin/rmmod pciehp
    # /sbin/modprobe shpchp
    # ls -lt /sys/bus/pci/slots
    total 0
    /var/log/messages:-
    Feb 3 18:21:05 localhost kernel: shpchp: Standard Hot Plug PCI Controller Driver version: 0.4

    # /sbin/rmmod shpchp
    #


    [root@localhost linux-2.6.25.x86_64]# /sbin/rmmod shpchp
    [root@localhost linux-2.6.25.x86_64]#



    Thanks,
    Krishna

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