[Bug 214789] ehci-hcd.c ISR

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=214789

--- Comment #30 from Scott Arnold (scott.c.arnold@nasa.gov) ---
Hello,
The device does not appear to support MSI.
pci_enable_msi and pci_alloc_irq_vectors fail.

From lspci (devices uses a bridge chip):

87:00.0 PCI bridge: PLX Technology, Inc. PEX8112 x1 Lane PCI Express-to-PCI
Bridge (rev aa) (prog-if 00 [Normal decode])
        Physical Slot: 5
        Flags: bus master, fast devsel, latency 0, IRQ 16, NUMA node 2
        Bus: primary=87, secondary=88, subordinate=88, sec-latency=64
        I/O behind bridge: 0000a000-0000afff
        Memory behind bridge: ca100000-ca1fffff
        Capabilities: [40] Power Management version 2
        Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+
        Capabilities: [60] Express PCI-Express to PCI/PCI-X Bridge, MSI 00
        Capabilities: [100] Power Budgeting <?>

88:00.0 Signal processing controller: Datum Inc. Bancomm-Timing Division Device
4013 (rev 20)
        Subsystem: Datum Inc. Bancomm-Timing Division Device 4013
        Flags: medium devsel, IRQ 16, NUMA node 2
        I/O ports at a000 [size=128]
        Memory at ca101000 (32-bit, non-prefetchable) [size=2K]
        Memory at ca100000 (32-bit, non-prefetchable) [size=2K]

This is a custom driver for our simulation environment.

I will have to schedule time on the machine to try pci=noioapicreroute.

Scott

-----Original Message-----
From: bugzilla-daemon@bugzilla.kernel.org <bugzilla-daemon@bugzilla.kernel.org> 
Sent: Friday, December 3, 2021 6:03 PM
To: Arnold, Scott C. (JSC-CD13)[SGT, INC] <scott.c.arnold@nasa.gov>
Subject: [EXTERNAL] [Bug 214789] ehci-hcd.c ISR

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Sean V Kelley (seanvk.dev@oregontracks.org) changed:

           What    |Removed                     |Added
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                 CC|                            |seanvk.dev@oregontracks.org

--- Comment #26 from Sean V Kelley (seanvk.dev@oregontracks.org) --- Hi,

Thanks for reaching out Krzysztof.

So this platform is a Xeon E7-8867.  which makes it a broadwell based Xeon. 

I don't see it in the logs, what is the reported device ID?  Those Xeon have
the capability disable the route to the ICH, which is these quirks are meant to
work with.

It also looks like you are using an out of tree driver?  Is that correct?

Are you unable to use MSI with this device?

Sean

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