linux-kernel - Re: [PATCH 2/2] PCI: Only enable realloc auto when root bus has 64bit mmio

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Date:	Thu, 25 Sep 2014 11:49:12 -0400
From:	Joseph Salisbury <joseph.salisbury@...onical.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH 2/2] PCI: Only enable realloc auto when root bus has 64bit
 mmio

On 09/16/2014 06:27 PM, Yinghai Lu wrote:
> On Tue, Sep 16, 2014 at 1:21 PM, Joseph Salisbury
> <joseph.salisbury@...onical.com> wrote:
>> A new bug[0] was opened due to enabling PCI_REALLOC_ENABLE_AUTO, which
>> is similar to the original bug[1] we discussed.
>>
>> Just wondering if there have been any additional ideas on realloc since
>> this was last discussed?
>>
>> [0] http://pad.lv/1363313
>> [1] http://pad.lv/1245938
> This one looks different, that LSI card support SRIOV, but BIOS does not
> allocate resource to SRIOV bar.
> We release old resource and ...reallocate resource to them with two retries.
>
> [    0.321983] pci_bus 0000:00: max bus depth: 1 pci_try_num: 2
> [    0.322010] pci 0000:00:03.0: BAR 15: assigned [mem
> 0xef800000-0xef8fffff pref]
> [    0.322025] pci 0000:01:00.0: reg 0x174: [mem 0x00000000-0x00003fff 64bit]
> [    0.322033] pci 0000:01:00.0: reg 0x17c: [mem 0x00000000-0x0003ffff 64bit]
> [    0.322040] pci 0000:01:00.0: reg 0x174: [mem 0x00000000-0x00003fff 64bit]
> [    0.322042] pci 0000:01:00.0: BAR 6: assigned [mem
> 0xef800000-0xef87ffff pref]
> [    0.322051] pci 0000:01:00.0: reg 0x17c: [mem 0x00000000-0x0003ffff 64bit]
> [    0.322053] pci 0000:01:00.0: BAR 9: can't assign mem (size 0x400000)
> [    0.322061] pci 0000:01:00.0: reg 0x174: [mem 0x00000000-0x00003fff 64bit]
> [    0.322063] pci 0000:01:00.0: BAR 7: assigned [mem
> 0xfbd00000-0xfbd3ffff 64bit]
> [    0.322070] pci 0000:00:03.0: PCI bridge to [bus 01]
> [    0.322073] pci 0000:00:03.0:   bridge window [io  0xc000-0xcfff]
> [    0.322077] pci 0000:00:03.0:   bridge window [mem 0xfbd00000-0xfbdfffff]
> [    0.322080] pci 0000:00:03.0:   bridge window [mem
> 0xef800000-0xef8fffff pref]
> [    0.322142] pci_bus 0000:00: No. 2 try to assign unassigned res
> [    0.322143] release child resource [mem 0xfbd00000-0xfbd3ffff 64bit]
> [    0.322144] release child resource [mem 0xfbd80000-0xfbdbffff 64bit]
> [    0.322145] release child resource [mem 0xfbdfc000-0xfbdfffff 64bit]
> [    0.322147] pci 0000:00:03.0: resource 14 [mem
> 0xfbd00000-0xfbdfffff] released
> [    0.322148] pci 0000:00:03.0: PCI bridge to [bus 01]
> [    0.322156] pci 0000:00:03.0: bridge window [mem
> 0x00100000-0x001fffff] to [bus 01] add_size 500000
> [    0.322174] pci 0000:00:03.0: res[14]=[mem 0x00100000-0x001fffff]
> get_res_add_size add_size 500000
> [    0.322176] pci 0000:00:03.0: BAR 14: assigned [mem 0xefb00000-0xf00fffff]
> [    0.322185] pci 0000:01:00.0: reg 0x174: [mem 0xfbd00000-0xfbd03fff 64bit]
> [    0.322192] pci 0000:01:00.0: reg 0x17c: [mem 0x00000000-0x0003ffff 64bit]
> [    0.322194] pci 0000:01:00.0: res[9]=[mem
> 0x00000000-0xffffffffffffffff 64bit] get_res_add_size add_size 400000
> [    0.322196] pci 0000:01:00.0: res[7]=[mem
> 0x00000000-0xffffffffffffffff 64bit] get_res_add_size add_size 40000
> [    0.322198] pci 0000:01:00.0: BAR 3: assigned [mem
> 0xefb00000-0xefb3ffff 64bit]
> [    0.322211] pci 0000:01:00.0: reg 0x17c: [mem 0x00000000-0x0003ffff 64bit]
> [    0.322212] pci 0000:01:00.0: BAR 9: assigned [mem
> 0xefb40000-0xeff3ffff 64bit]
> [    0.322219] pci 0000:01:00.0: BAR 1: assigned [mem
> 0xeff40000-0xeff43fff 64bit]
> [    0.322232] pci 0000:01:00.0: reg 0x174: [mem 0xfbd00000-0xfbd03fff 64bit]
> [    0.322234] pci 0000:01:00.0: BAR 7: assigned [mem
> 0xeff44000-0xeff83fff 64bit]
> [    0.322241] pci 0000:00:03.0: PCI bridge to [bus 01]
> [    0.322244] pci 0000:00:03.0:   bridge window [io  0xc000-0xcfff]
> [    0.322248] pci 0000:00:03.0:   bridge window [mem 0xefb00000-0xf00fffff]
> [    0.322251] pci 0000:00:03.0:   bridge window [mem
> 0xef800000-0xef8fffff 64bit pref]
>
> So the resource realloc do work as expected. but LSI firmware has some
> problem again?
>
> We may need to add command after the reset the bridge resource.
>
> Can you get bootlog with "pci=earlydump"?
>
> Thanks
>
> Yinghai
Hi Yinghai,

The user collected earlydump data, which can be found here:
https://launchpadlibrarian.net/185141163/dmesg-pci%3Dearlydump
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