From: "Rafał Miłecki" <zajec5@gmail.com>
To: Ray Jui <ray.jui@broadcom.com>,
Bjorn Helgaas <bhelgaas@google.com>, Ray Jui <rjui@broadcom.com>,
Scott Branden <sbranden@broadcom.com>,
Jon Mason <jonmason@broadcom.com>, Oza Oza <oza.oza@broadcom.com>,
JD Zheng <jiandong.zheng@broadcom.com>,
Andy Gospodarek <gospo@broadcom.com>
Cc: linux-pci@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com,
linux-arm-kernel@lists.infradead.org
Subject: Re: pcie-iproc: broken 2nd (& 3rd?) controller support by c3245a566400 ("PCI: iproc: Request host bridge window resources")
Date: Thu, 9 Mar 2017 00:28:47 +0100 [thread overview]
Message-ID: <4acf85df-d5d0-6a01-b331-3158d0233a0e@gmail.com> (raw)
In-Reply-To: <88dc6a0e-8989-d09f-1f93-6673a31664c1@broadcom.com>
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WARNING: multiple messages have this Message-ID (diff)
From: zajec5@gmail.com (Rafał Miłecki)
To: linux-arm-kernel@lists.infradead.org
Subject: pcie-iproc: broken 2nd (& 3rd?) controller support by c3245a566400 ("PCI: iproc: Request host bridge window resources")
Date: Thu, 9 Mar 2017 00:28:47 +0100 [thread overview]
Message-ID: <4acf85df-d5d0-6a01-b331-3158d0233a0e@gmail.com> (raw)
In-Reply-To: <88dc6a0e-8989-d09f-1f93-6673a31664c1@broadcom.com>
On 03/08/2017 06:22 PM, Ray Jui wrote:
> On 3/8/2017 4:56 AM, Rafa? Mi?ecki wrote:
>> I just tried upgrading BCM5301X from 4.4 to 4.9 and noticed I don't see
>> card
>> connected to the 2nd controller.
>>
>> [ 2.593534] pcie_iproc_bcma bcma0:7: PCI host bridge to bus 0000:00
>> [ 2.599786] pci_bus 0000:00: root bus resource [mem
>> 0x08000000-0x0fffffff]
>> [ 2.606663] pcie_iproc_bcma bcma0:7: link: UP
>> [ 2.611316] PCI: bus0: Fast back to back transfers disabled
>> [ 2.616899] pci 0000:00:00.0: bridge configuration invalid ([bus
>> 00-00]), reconfiguring
>> [ 2.625395] PCI: bus1: Fast back to back transfers disabled
>> [ 2.631011] pci 0000:00:00.0: BAR 8: assigned [mem
>> 0x08000000-0x080fffff]
>> [ 2.637795] pci 0000:01:00.0: BAR 0: assigned [mem
>> 0x08000000-0x08007fff 64bit]
>> [ 2.645091] pci 0000:00:00.0: PCI bridge to [bus 01]
>> [ 2.650042] pci 0000:00:00.0: bridge window [mem
>> 0x08000000-0x080fffff]
>>
>> [ 2.657199] pcie_iproc_bcma bcma0:8: resource collision: [mem
>> 0x40000000-0x47ffffff] conflicts with PCIe MEM space [mem
>> 0x40000000-0x47ffffff]
>> [ 2.669946] pcie_iproc_bcma bcma0:8: PCIe controller setup failed
>> [ 2.676032] pcie_iproc_bcma: probe of bcma0:8 failed with error -16
>>
>
> Would you be able to add some debugging trace to see when the resource
> was allocated the first time, and when the resource was allocated the
> second time and therefore results in the conflict?
>
> In addition, I'm puzzled why this resource conflict issue for BCMA is
> not seen with the first controller with outbound memory in the range of
> 0x08000000 - 0x0fffffff? Maybe that provides a valuable data point here.
This is clearly a conflict between iproc on 1st controller and iproc on 2nd controller.
I added following code to the pcie-iproc-bcma.c:
if (bdev->core_unit == 0) {
dev_info(dev, "[%s] aborting\n", __func__);
return -ENOTSUPP;
}
And it resulted in 2nd controller (bcma0:8) working again:
[ 2.472562] pcie_iproc_bcma bcma0:7: [iproc_pcie_bcma_probe] aborting
[ 2.479027] pcie_iproc_bcma: probe of bcma0:7 failed with error -524
[ 2.607425] pcie_iproc_bcma bcma0:8: PCI host bridge to bus 0000:00
[ 2.613678] pci_bus 0000:00: root bus resource [mem 0x40000000-0x47ffffff]
[ 2.620557] pcie_iproc_bcma bcma0:8: link: UP
[ 2.625206] PCI: bus0: Fast back to back transfers disabled
[ 2.630789] pci 0000:00:00.0: bridge configuration invalid ([bus 00-00]), reconfiguring
[ 2.639260] PCI: bus1: Fast back to back transfers disabled
[ 2.644871] pci 0000:00:00.0: BAR 8: assigned [mem 0x40000000-0x400fffff]
[ 2.651665] pci 0000:01:00.0: BAR 0: assigned [mem 0x40000000-0x40007fff 64bit]
[ 2.658962] pci 0000:00:00.0: PCI bridge to [bus 01]
[ 2.663911] pci 0000:00:00.0: bridge window [mem 0x40000000-0x400fffff]
I'm not exactly sure where this conflict is coming from. For debugging purposes I added:
dev_info(dev, "[%s] res_mem:%pR\n", __func__, &res_mem);
Which resulted in:
[ 2.474558] pcie_iproc_bcma bcma0:7: [iproc_pcie_bcma_probe] res_mem:[mem 0x08000000-0x0fffffff]
[ 2.597246] pcie_iproc_bcma bcma0:7: PCI host bridge to bus 0000:00
[ 2.603500] pci_bus 0000:00: root bus resource [mem 0x08000000-0x0fffffff]
[ 2.610382] pcie_iproc_bcma bcma0:7: link: UP
[ 2.615032] PCI: bus0: Fast back to back transfers disabled
[ 2.620619] pci 0000:00:00.0: bridge configuration invalid ([bus 00-00]), reconfiguring
[ 2.629131] PCI: bus1: Fast back to back transfers disabled
[ 2.634745] pci 0000:00:00.0: BAR 8: assigned [mem 0x08000000-0x080fffff]
[ 2.641537] pci 0000:01:00.0: BAR 0: assigned [mem 0x08000000-0x08007fff 64bit]
[ 2.648835] pci 0000:00:00.0: PCI bridge to [bus 01]
[ 2.653783] pci 0000:00:00.0: bridge window [mem 0x08000000-0x080fffff]
[ 2.660947] pcie_iproc_bcma bcma0:8: [iproc_pcie_bcma_probe] res_mem:[mem 0x40000000-0x47ffffff]
[ 2.669732] pcie_iproc_bcma bcma0:8: resource collision: [mem 0x40000000-0x47ffffff] conflicts with PCIe MEM space [mem 0x40000000-0x47ffffff]
[ 2.682470] pcie_iproc_bcma bcma0:8: PCIe controller setup failed
[ 2.688559] pcie_iproc_bcma: probe of bcma0:8 failed with error -16
There shouldn't be any conflict between 0x08000000-0x0fffffff and 0x40000000-0x47ffffff, right?
For bcma we do this:
res_mem.start = bdev->addr_s[0];
res_mem.end = bdev->addr_s[0] + SZ_128M - 1;
In case of BCM4708 there are following addresses:
[ 2.285430] bcma: bus0: Core 7 found: PCIe Gen 2 (manuf 0x4BF, id 0x501, rev 0x01, class 0x0) addr:0x18012000 wrap:0x18101000 addr_s[0]:0x08000000 addr_s[1]:0x00000000
[ 2.300384] bcma: bus0: Core 8 found: PCIe Gen 2 (manuf 0x4BF, id 0x501, rev 0x01, class 0x0) addr:0x18013000 wrap:0x18102000 addr_s[0]:0x40000000 addr_s[1]:0x00000000
which matches what we see in the boot log.
next prev parent reply other threads:[~2017-03-08 23:28 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-08 12:56 pcie-iproc: broken 2nd (& 3rd?) controller support by c3245a566400 ("PCI: iproc: Request host bridge window resources") Rafał Miłecki
2017-03-08 12:56 ` Rafał Miłecki
2017-03-08 17:22 ` Ray Jui
2017-03-08 23:28 ` Rafał Miłecki [this message]
2017-03-08 23:28 ` Rafał Miłecki
2017-03-09 0:31 ` Ray Jui
2017-03-09 7:39 ` Rafał Miłecki
2017-03-09 7:39 ` Rafał Miłecki
2017-03-09 18:22 ` Bjorn Helgaas
2017-03-09 18:22 ` Bjorn Helgaas
2017-03-10 16:02 ` Rafał Miłecki
2017-03-10 16:02 ` Rafał Miłecki
2017-03-10 17:21 ` Ray Jui
2017-03-10 17:21 ` Ray Jui
2017-03-10 17:47 ` Bjorn Helgaas
2017-03-10 17:47 ` Bjorn Helgaas
2017-03-10 21:11 ` Rafał Miłecki
2017-03-10 21:11 ` Rafał Miłecki
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