See bug 1968143 for more reasoning for this.
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https://bugs.launchpad.net/bugs/1969091
Title:
Fixes for dma-iommu swiotlb bounce buffers
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If you attach an TBT3 NVME storage to USB4 port you can see the warnings
that come up without them. I think you can make a call whether that is
severe enough to warrant the change.
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This is going to pull a lot swiotlb/iommu API changes on oem-5.14. Need
confirmation of the necessity first.
** Also affects: linux-oem-5.14 (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux-oem-5.14 (Ubuntu Jammy)
Status: New => Incomplete
** Also affects: linux (
** Tags added: amd oem-priority originate-from-1968143
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https://bugs.launchpad.net/bugs/1969091
Title:
Fixes for dma-iommu swiotlb bounce buffers
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** Also affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: Incomplete
** Description changed:
https://lore.kernel.org/all/20210929023300.335969-1-steve...@google.com/
landed to v5.16 and is being requested to backport to v5.15.y in
https://lore.kernel.org/stable/bl1pr12m
This is a more or less an follow-up to bug 1969086.
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https://bugs.launchpad.net/bugs/1969091
Title:
Fixes for dma-iommu swiotlb bounce buffers
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