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Date:   Fri, 10 Aug 2018 15:36:28 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Paul Menzel <pmenzel+linux-scsi@...gen.mpg.de>
Cc:     stable@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Ming Lei <ming.lei@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        it+linux-scsi@...gen.mpg.de,
        Adaptec OEM Raid Solutions <aacraid@...rosemi.com>,
        linux-scsi@...r.kernel.org
Subject: Re: aacraid: Regression in 4.14.56 with *genirq/affinity: assign
 vectors to all possible CPUs*

On Fri, Aug 10, 2018 at 03:21:52PM +0200, Paul Menzel wrote:
> Dear Greg,
> 
> 
> Commit ef86f3a7 (genirq/affinity: assign vectors to all possible CPUs) added
> for Linux 4.14.56 causes the aacraid module to not detect the attached devices
> anymore on a Dell PowerEdge R720 with two six core 24x E5-2630 @ 2.30GHz.
> 
> ```
> $ dmesg | grep raid
> [    0.269768] raid6: sse2x1   gen()  7179 MB/s
> [    0.290069] raid6: sse2x1   xor()  5636 MB/s
> [    0.311068] raid6: sse2x2   gen()  9160 MB/s
> [    0.332076] raid6: sse2x2   xor()  6375 MB/s
> [    0.353075] raid6: sse2x4   gen() 11164 MB/s
> [    0.374064] raid6: sse2x4   xor()  7429 MB/s
> [    0.379001] raid6: using algorithm sse2x4 gen() 11164 MB/s
> [    0.386001] raid6: .... xor() 7429 MB/s, rmw enabled
> [    0.391008] raid6: using ssse3x2 recovery algorithm
> [    3.559682] megaraid cmm: 2.20.2.7 (Release Date: Sun Jul 16 00:01:03 EST 2006)
> [    3.570061] megaraid: 2.20.5.1 (Release Date: Thu Nov 16 15:32:35 EST 2006)
> [   10.725767] Adaptec aacraid driver 1.2.1[50834]-custom
> [   10.731724] aacraid 0000:04:00.0: can't disable ASPM; OS doesn't have ASPM control
> [   10.743295] aacraid: Comm Interface type3 enabled
> $ lspci -nn | grep Adaptec
> 04:00.0 Serial Attached SCSI controller [0107]: Adaptec Series 8 12G SAS/PCIe 3 [9005:028d] (rev 01)
> 42:00.0 Serial Attached SCSI controller [0107]: Adaptec Smart Storage PQI 12G SAS/PCIe 3 [9005:028f] (rev 01)
> ```
> 
> But, it still works with a Dell PowerEdge R715 with two eight core AMD
> Opteron 6136, the card below.
> 
> ```
> $ lspci -nn | grep Adaptec
> 22:00.0 Serial Attached SCSI controller [0107]: Adaptec Series 8 12G SAS/PCIe 3 [9005:028d] (rev 01)
> ```
> 
> Reverting the commit fixes the issue.
> 
> commit ef86f3a72adb8a7931f67335560740a7ad696d1d
> Author: Christoph Hellwig <hch@....de>
> Date:   Fri Jan 12 10:53:05 2018 +0800
> 
>     genirq/affinity: assign vectors to all possible CPUs
>     
>     commit 84676c1f21e8ff54befe985f4f14dc1edc10046b upstream.
>     
>     Currently we assign managed interrupt vectors to all present CPUs.  This
>     works fine for systems were we only online/offline CPUs.  But in case of
>     systems that support physical CPU hotplug (or the virtualized version of
>     it) this means the additional CPUs covered for in the ACPI tables or on
>     the command line are not catered for.  To fix this we'd either need to
>     introduce new hotplug CPU states just for this case, or we can start
>     assining vectors to possible but not present CPUs.
>     
>     Reported-by: Christian Borntraeger <borntraeger@...ibm.com>
>     Tested-by: Christian Borntraeger <borntraeger@...ibm.com>
>     Tested-by: Stefan Haberland <sth@...ux.vnet.ibm.com>
>     Fixes: 4b855ad37194 ("blk-mq: Create hctx for each present CPU")
>     Cc: linux-kernel@...r.kernel.org
>     Cc: Thomas Gleixner <tglx@...utronix.de>
>     Signed-off-by: Christoph Hellwig <hch@....de>
>     Signed-off-by: Jens Axboe <axboe@...nel.dk>
>     Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> The problem doesn’t happen with Linux 4.17.11, so there are commits in
> Linux master fixing this. Unfortunately, my attempts to find out failed.
> 
> I was able to cherry-pick the three commits below on top of 4.14.62,
> but the problem persists.
> 
> 6aba81b5a2f5 genirq/affinity: Don't return with empty affinity masks on error
> 355d7ecdea35 scsi: hpsa: fix selection of reply queue
> e944e9615741 scsi: virtio_scsi: fix IO hang caused by automatic irq vector affinity
> 
> Trying to cherry-pick the commits below, referencing the commit
> in question, gave conflicts.
> 
> 1. adbe552349f2 scsi: megaraid_sas: fix selection of reply queue
> 2. d3056812e7df genirq/affinity: Spread irq vectors among present CPUs as far as possible
> 
> To avoid further trial and error with the server with a slow firmware,
> do you know what commits should fix the issue?

Look at the email on the stable mailing list:
	Subject: Re: Fix for 84676c1f (b5b6e8c8) missing in 4.14.y
it should help you out here.  Can you try the patches listed there?

> PS: I couldn’t find, who suggested this for stable, that means how
> it was picked to be added to stable. Is there an easy way to find
> that out?

Dig through the archives is usually the best way.  Looks like it came in
through a suggestion from Sasha.

thanks,

greg k-h

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