linux-kernel - Re: 5.10 regression caused by: "uas: fix sdev->host->dma_dev": many XHCI swiotlb buffer is full / DMAR: Device bounce map failed errors on thunderbolt connected XHCI controller

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Date:   Sat, 28 Nov 2020 18:15:00 +0100
From:   Christoph Hellwig <hch@....de>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Christoph Hellwig <hch@....de>, Tom Yan <tom.ty89@...il.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb <linux-usb@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-pci@...r.kernel.org, Lu Baolu <baolu.lu@...ux.intel.com>
Subject: Re: 5.10 regression caused by: "uas: fix sdev->host->dma_dev":
 many XHCI swiotlb buffer is full / DMAR: Device bounce map failed
 errors on thunderbolt connected XHCI controller

Can you give this one-liner a spin?

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index c6622011d4938c..e889111b55c71d 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4007,6 +4007,7 @@ static const struct dma_map_ops bounce_dma_ops = {
 	.alloc_pages		= dma_common_alloc_pages,
 	.free_pages		= dma_common_free_pages,
 	.dma_supported		= dma_direct_supported,
+	.max_mapping_size	= swiotlb_max_mapping_size,
 };
 
 static inline int iommu_domain_cache_init(void)