linux-kernel - Re: sata_sil24: swiotlb buffer is full ?

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Date:   Mon, 31 Oct 2016 10:18:25 -0600
From:   Tejun Heo <tj@...nel.org>
To:     Andrew Ryder <tireman@...w.ca>
Cc:     linux-ide@...r.kernel.org,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: sata_sil24: swiotlb buffer is full ?

Hello,

On Sat, Oct 29, 2016 at 11:40:29PM -0400, Andrew Ryder wrote:
> I have some disks attached to a "Silicon Image, Inc. SiI 3124 PCI-X Serial
> ATA Controller" and it repeatedly locks up the system with the message
> whenever there is heavy disk i/o. The system the controller is attached to
> is a via EPIA-M910 board.
> 
> sata_sil24: 0000:06:03.0: swiotlb buffer is full: 65536 bytes)
> DMA: Out of SW-IOMMU space for 65536 bytes at device .."
> sata_sil24 0000:06:03.0: swiotlb buffer is full (sz: 65536 bytes .."
> 
> For the past week I have been running with two additional boot parameters
> (iommu=allowdac swiotlb=131072) which seem to have solved the issue, but I
> was curious if this is a driver bug or not?

(cc'ing swiotbl maintainer, hi!)

That looks like iotlb area running out.  I don't think there's much to
be done from driver side and we've traditionally been pretty bad at
handling iotlb errors.  Konrad, do you have any ideas?

Thanks.

-- 
tejun