[Bug 215890] Regression in 5.18: bcm5974 trackpad causes error: xhci_hcd rejecting DMA map of vmalloc memory

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=215890

--- Comment #7 from Satadru Pramanik (satadru@umich.edu) ---
After bisection:
git bisect good
f5ff79fddf0efecca538046b5cc20fb3ded2ec4f is the first bad commit
commit f5ff79fddf0efecca538046b5cc20fb3ded2ec4f
Author: Christoph Hellwig <hch@lst.de>
Date:   Sat Feb 26 16:40:21 2022 +0100

    dma-mapping: remove CONFIG_DMA_REMAP

    CONFIG_DMA_REMAP is used to build a few helpers around the core
    vmalloc code, and to use them in case there is a highmem page in
    dma-direct, and to make dma coherent allocations be able to use
    non-contiguous pages allocations for DMA allocations in the dma-iommu
    layer.

    Right now it needs to be explicitly selected by architectures, and
    is only done so by architectures that require remapping to deal
    with devices that are not DMA coherent.  Make it unconditional for
    builds with CONFIG_MMU as it is very little extra code, but makes
    it much more likely that large DMA allocations succeed on x86.

    This fixes hot plugging a NVMe thunderbolt SSD for me, which tries
    to allocate a 1MB buffer that is otherwise hard to obtain due to
    memory fragmentation on a heavily used laptop.

    Signed-off-by: Christoph Hellwig <hch@lst.de>
    Reviewed-by: Robin Murphy <robin.murphy@arm.com>

 arch/arm/Kconfig          |  2 +-
 arch/xtensa/Kconfig       |  2 +-
 drivers/iommu/dma-iommu.c | 14 +++++---------
 kernel/dma/Kconfig        |  7 +------
 kernel/dma/Makefile       |  2 +-
 kernel/dma/direct.c       | 18 +++++++-----------
 6 files changed, 16 insertions(+), 29 deletions(-)

-- 
You may reply to this email to add a comment.

You are receiving this mail because:
You are watching the assignee of the bug.