linux-kernel - Re: PCI/kernel msi code vs GIC ITS driver conflict?

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Message-ID: <e3a4a04a-4669-5a03-5115-84c6573b99e9@kernel.org>
Date:   Thu, 5 Sep 2019 15:32:16 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     John Garry <john.garry@...wei.com>,
        Andrew Murray <andrew.murray@....com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Linuxarm <linuxarm@...wei.com>,
        "luojiaxing@...wei.com" <luojiaxing@...wei.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: PCI/kernel msi code vs GIC ITS driver conflict?

On 05/09/2019 15:23, John Garry wrote:
> On 05/09/2019 14:50, Marc Zyngier wrote:
>> On 05/09/2019 14:26, John Garry wrote:
>>> On 05/09/2019 12:22, Marc Zyngier wrote:
>>>> OK, debug was slightly off, but it is interesting that the driver didn't
>>>> unmap the device, either because it is flagged as shared (with what?) or
>>>> that additional interrupts are allocated in the lpi_map for this
>>>> instance.
>>>>
>>>> Here's an updated debug patch. Can you please run the same thing again?
>>>>
>>>
>>> As requested:
>>>
>>> root@(none)$ echo 0000:74:02.0 > ./sys/bus/pci/drivers/hisi_sas_v3_hw/unbind
>>>
>>> <snip>
>>>
>>> [   78.593897] Freed devid 7410 event 0 LPI 0
>>> [   78.597990] Freed devid 7410 event 1 LPI 0
>>> [   78.602080] Freed devid 7410 event 2 LPI 0
>>> [   78.606169] Freed devid 7410 event 3 LPI 0
>>> [   78.610253] Freed devid 7410 event 4 LPI 0
>>> [   78.614337] Freed devid 7410 event 5 LPI 0
>>> [   78.618422] Freed devid 7410 event 6 LPI 0
>>> [   78.622506] Freed devid 7410 event 7 LPI 0
>>> [   78.626590] Freed devid 7410 event 8 LPI 0
>>> [   78.630674] Freed devid 7410 event 9 LPI 0
>>> [   78.634758] Freed devid 7410 event 10 LPI 0
>>> [   78.638930] Freed devid 7410 event 11 LPI 0
>>> [   78.643101] Freed devid 7410 event 12 LPI 0
>>> [   78.647272] Freed devid 7410 event 13 LPI 0
>>> [   78.651445] Freed devid 7410 event 14 LPI 0
>>> [   78.655616] Freed devid 7410 event 15 LPI 0
>>> [   78.659787] Freed devid 7410 event 16 LPI 0
>>> [   78.663959] Unmap devid 7410 shared 0 lpi_map 17-31
>>
>> Bah. Try this for size...
>>
> 
> It fits:
> 
> root@(none)$ echo 0000:74:02.0 > ./sys/bus/pci/drivers/hisi_sas_v3_hw/unbind
> 
> <snip>
> 
> [   34.806156] Freed devid 7410 LPI 0
> [   34.809555] Freed devid 7410 LPI 0
> [   34.812951] Freed devid 7410 LPI 0
> [   34.816344] Freed devid 7410 LPI 0
> [   34.819734] Freed devid 7410 LPI 0
> [   34.823122] Freed devid 7410 LPI 0
> [   34.826512] Freed devid 7410 LPI 0
> [   34.829901] Freed devid 7410 LPI 0
> [   34.833291] Freed devid 7410 LPI 0
> [   34.836680] Freed devid 7410 LPI 0
> [   34.840071] Freed devid 7410 LPI 0
> [   34.843461] Freed devid 7410 LPI 0
> [   34.846848] Freed devid 7410 LPI 0
> [   34.850238] Freed devid 7410 LPI 0
> [   34.853627] Freed devid 7410 LPI 0
> [   34.857017] Freed devid 7410 LPI 0
> [   34.860406] Freed devid 7410 LPI 0
> [   34.863797] Unmap devid 7410 shared 0 lpi_map
> [   34.868229] Unmap devid 7410
> root@(none)$
> root@(none)$
> root@(none)$ echo 0000:74:02.0 > ./sys/bus/pci/drivers/hisi_sas_v3_hw/bind
> [   39.158802] scsi host0: hisi_sas_v3_hw
> [   40.383384] ITS: alloc 9920:32
> [   40.386429] ITT 32 entries, 5 bits
> [   40.389970] ID:0 pID:9920 vID:23
> [   40.393188] ID:1 pID:9921 vID:24
> [   40.396404] ID:2 pID:9922 vID:25
> [   40.399621] ID:3 pID:9923 vID:26
> [   40.402836] ID:4 pID:9924 vID:27
> [   40.406053] ID:5 pID:9925 vID:28
> [   40.409269] ID:6 pID:9926 vID:29
> [   40.412485] ID:7 pID:9927 vID:30
> [   40.415702] ID:8 pID:9928 vID:31
> [   40.418916] ID:9 pID:9929 vID:32
> [   40.422132] ID:10 pID:9930 vID:33
> [   40.425435] ID:11 pID:9931 vID:34
> [   40.428739] ID:12 pID:9932 vID:35
> [   40.432042] ID:13 pID:9933 vID:36
> [   40.435345] ID:14 pID:9934 vID:37
> [   40.438648] ID:15 pID:9935 vID:38
> [   40.441951] ID:16 pID:9936 vID:39
> 
> 
> <snip>

Awesome. Can I take this as a Tested-by?

> Btw, I hacked the "Freed devid %x event %d LPI %ld\n" print to remove 
> the "event" value, as you may have noticed.

Yup, not meaningful for the problem at hand.

Thanks again for your help!

	M.
-- 
Jazz is not dead, it just smells funny...