From: Christoph Hellwig Date: Wed, 5 Jun 2019 19:08:24 +0000 (+0200) Subject: nvme-pci: don't limit DMA segement size X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=a48bc520011ea7a701826a9e3a770b128f283328;p=openwrt%2Fstaging%2Fblogic.git 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 Reported-by: Sebastian Ott Signed-off-by: Jens Axboe --- diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index f562154551ce..524d6bd6d095 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -2513,6 +2513,12 @@ static void nvme_reset_work(struct work_struct *work) */ dev->ctrl.max_hw_sectors = NVME_MAX_KB_SZ << 1; dev->ctrl.max_segments = NVME_MAX_SEGS; + + /* + * Don't limit the IOMMU merged segment size. + */ + dma_set_max_seg_size(dev->dev, 0xffffffff); + mutex_unlock(&dev->shutdown_lock); /*