On Wed, 5 Jun 2019, Christoph Hellwig wrote: > Actually, it looks like something completely general isn't > easily doable, not without some major dma API work. Here is what > should fix nvme, but a few other drivers will need fixes as well: > > --- > From 745541130409bc837a3416300f529b16eded8513 Mon Sep 17 00:00:00 2001 > From: Christoph Hellwig <hch@xxxxxx> > Date: Wed, 5 Jun 2019 14:55:26 +0200 > Subject: nvme-pci: don't limit DMA segement size > > NVMe uses PRPs (or optionally unlimited SGLs) for data transfers and > has no specific limit for a single DMA segement. Limiting the size > will cause problems because the block layer assumes PRP-ish devices > using a virt boundary mask don't have a segment limit. And while this > is true, we also really need to tell the DMA mapping layer about it, > otherwise dma-debug will trip over it. > > Signed-off-by: Christoph Hellwig <hch@xxxxxx> > Reported-by: Sebastian Ott <sebott@xxxxxxxxxxxxx> Works for me. Thanks!
