linux-kernel - RE: [PATCH 10/13] megaraid_sas: set virt_boundary

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Date:   Thu, 6 Jun 2019 21:07:27 +0530
From:   Kashyap Desai <kashyap.desai@...adcom.com>
To:     Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>
Cc:     Sebastian Ott <sebott@...ux.ibm.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Max Gurtovoy <maxg@...lanox.com>,
        Bart Van Assche <bvanassche@....org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Oliver Neukum <oneukum@...e.com>, linux-block@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-scsi@...r.kernel.org,
        "PDL,MEGARAIDLINUX" <megaraidlinux.pdl@...adcom.com>,
        PDL-MPT-FUSIONLINUX <mpt-fusionlinux.pdl@...adcom.com>,
        linux-hyperv@...r.kernel.org, linux-usb@...r.kernel.org,
        usb-storage@...ts.one-eyed-alien.net, linux-kernel@...r.kernel.org
Subject: RE: [PATCH 10/13] megaraid_sas: set virt_boundary_mask in the scsi host

>
> This ensures all proper DMA layer handling is taken care of by the SCSI
> midlayer.  Note that the effect is global, as the IOMMU merging is based
> off a
> paramters in struct device.  We could still turn if off if no PCIe devices
> are
> present, but I don't know how to find that out.
>
> Also remove the bogus nomerges flag, merges do take the virt_boundary into
> account.

Hi Christoph, Changes for <megaraid_sas> and <mpt3sas> looks good. We want
to confirm few sanity before ACK. BTW, what benefit we will see moving
virt_boundry setting to SCSI mid layer ? Is it just modular approach OR any
functional fix ?

Kashyap