linux-kernel - Re: [PATCHv4 11/12] dmapool: link blocks across pages

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Date:   Mon, 27 Feb 2023 18:01:48 -0700
From:   Keith Busch <kbusch@...nel.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Keith Busch <kbusch@...a.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, willy@...radead.org, hch@....de,
        tonyb@...ernetics.com, akpm@...ux-foundation.org,
        kernel-team@...a.com
Subject: Re: [PATCHv4 11/12] dmapool: link blocks across pages

On Sun, Feb 26, 2023 at 04:54:45PM -0800, Guenter Roeck wrote:
> With this patch in linux-next, I see a boot failure when trying to boot
> a powernv qemu emulation from the SCSI MEGASAS controller.
> 
> Qemu command line is
> 
> qemu-system-ppc64 -M powernv -cpu POWER9 -m 2G \
> 	-kernel arch/powerpc/boot/zImage.epapr \
> 	-snapshot \
> 	-device megasas,id=scsi,bus=pcie.0 -device scsi-hd,bus=scsi.0,drive=d0 \
> 	-drive file=rootfs-el.ext2,format=raw,if=none,id=d0 \
> 	-device i82557a,netdev=net0,bus=pcie.1 -netdev user,id=net0 \
> 	-nographic -vga none -monitor null -no-reboot \
> 	--append "root=/dev/sda console=tty console=hvc0"
> 
> Reverting this patch together with "dmapool: create/destroy cleanup"
> fixes the problem.

Thanks for the notice. I was able to recreate, and it does look like this is
fixed with my more recent update changing the dma pool block order, and that is
still pending out of tree. Would you also be able to verify? The patch is
available here:

  https://lore.kernel.org/linux-mm/Y%2FzmUXrAiNujjoib@kbusch-mbp.dhcp.thefacebook.com/T/#t