RE: How to resolve an issue in swiotlb environment?

Yoshihiro Shimoda
2019-06-13T04:52:13Z

Hi Christoph,

> From: Christoph Hellwig, Sent: Wednesday, June 12, 2019 8:31 PM
>
> On Wed, Jun 12, 2019 at 08:52:21AM +0000, Yoshihiro Shimoda wrote:
> > Hi Christoph,
> >
> > > From: Christoph Hellwig, Sent: Wednesday, June 12, 2019 4:31 PM
> > >
> > > First things first:
> > >
> > > Yoshihiro, can you try this git branch? The new bits are just the three
> > > patches at the end, but they sit on top of a few patches already sent
> > > out to the list, so a branch is probably either:
> > >
> > > git://git.infradead.org/users/hch/misc.git scsi-virt-boundary-fixes
> >
> > Thank you for the patches!
> > Unfortunately, the three patches could not resolve this issue.
> > However, it's a hint to me, and then I found the root cause:
> > - slave_configure() in drivers/usb/storage/scsiglue.c calls
> > blk_queue_max_hw_sectors() with 2048 sectors (1 MiB) when USB_SPEED_SUPER or more.
> > -- So that, even if your patches (also I fixed it a little [1]) could not resolve
> > the issue because the max_sectors is overwritten by above code.
> >
> > So, I think we should fix the slave_configure() by using dma_max_mapping_size().
> > What do you think? If so, I can make such a patch.
>
> Yes, please do.

Thank you for your comment. I sent a patch to related mailing lists and you.

Best regards,
Yoshihiro Shimoda