From: Bjorn Helgaas <helgaas@kernel.org>
To: Kallol Biswas <kallol@nucleodyne.com>
Cc: linux-pci@vger.kernel.org
Subject: Re: No bus number available for hot-added bridge
Date: Fri, 15 Jul 2016 16:51:21 -0500 [thread overview]
Message-ID: <20160715215121.GB1706@localhost> (raw)
In-Reply-To: <CAH=XD5-6QXxA42ukxJ40sOzGXqScS7u3QZAwCaCYT2r3pJxdCA@mail.gmail.com>
On Fri, Jul 15, 2016 at 01:33:32PM -0700, Kallol Biswas wrote:
> Hi,
> I have been trying to hot-add a PCIe bridge and getting the
> following message in dmesg:
>
> No bus number available for hot-added bridge 0000:06:00.
>
> The kernel is 4.4. Do we have any patch for this? I tried Yinghai's
> for-pci-busn-alloc patch. Did not work. Not sure I picked up the right
> changes.
As far as I know there is not a patch for this. We probably should
reserve some bus number space just like we do for memory and I/O
space, but I don't think we do that today.
One workaround would be to have firmware configure the upstream
bridges (05:00.0 and the path leading to it) with larger bus number
apertures.
> [ 793.982780] pciehp 0000:05:00.0:pcie24: pciehp_check_link_active:
> lnk_status = a103
> [ 793.982783] pciehp 0000:05:00.0:pcie24: slot(0-1): Link Up event
> [ 793.982815] pciehp 0000:05:00.0:pcie24: pciehp_get_power_status:
> SLOTCTRL 80 value read 1571
> [ 793.982835] pciehp 0000:05:00.0:pcie24: pending interrupts 0x0010
> from Slot Status
> [ 793.982841] pciehp 0000:05:00.0:pcie24: pciehp_power_on_slot:
> SLOTCTRL 80 write cmd 0
> [ 793.982847] pciehp 0000:05:00.0:pcie24: __pciehp_link_set: lnk_ctrl = 0
> [ 793.982859] pciehp 0000:05:00.0:pcie24: pending interrupts 0x0010
> from Slot Status
> [ 793.982865] pciehp 0000:05:00.0:pcie24: pciehp_green_led_blink:
> SLOTCTRL 80 write cmd 200
> [ 793.982871] pciehp 0000:05:00.0:pcie24: pciehp_check_link_active:
> lnk_status = a103
> [ 794.085818] pciehp 0000:05:00.0:pcie24: pciehp_check_link_status:
> lnk_status = a103
> [ 794.085909] pci 0000:06:00.0: [10b5:9797] type 01 class 0x060400
> [ 794.086232] pci 0000:06:00.0: Max Payload Size set to 256 (was 128, max 512)
> [ 794.086563] pci 0000:06:00.0: PME# supported from D0 D3hot D3cold
> [ 794.086884] iommu: Adding device 0000:06:00.0 to group 47
> [ 794.093797] No bus number available for hot-added bridge 0000:06:00.0
> [ 794.093816] pcieport 0000:05:00.0: PCI bridge to [bus 06]
> [ 794.093822] pcieport 0000:05:00.0: bridge window [io 0x1000-0x1fff]
> [ 794.093829] pcieport 0000:05:00.0: bridge window [mem
> 0xc8000000-0xc83fffff]
> [ 794.093835] pcieport 0000:05:00.0: bridge window [mem
> 0x280000000-0x2801fffff 64bit pref]
> [ 794.094364] pciehp 0000:05:00.0:pcie24: pending interrupts 0x0010
> from Slot Status
> [ 794.094369] pciehp 0000:05:00.0:pcie24: pciehp_green_led_on:
> SLOTCTRL 80 write cmd 100
> --
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next prev parent reply other threads:[~2016-07-15 21:51 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-15 20:33 No bus number available for hot-added bridge Kallol Biswas
2016-07-15 21:51 ` Bjorn Helgaas [this message]
2016-07-22 21:17 ` Yinghai Lu
2016-07-22 22:01 ` Kallol Biswas
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