[PATCH v2 00/10] Refine the locking for dev->iommu_group

[Marek Szyprowski]

Hi,

On 08.08.2023 12:31, Chen-Yu Tsai wrote:
> Hi,
>
> On Mon, Aug 7, 2023 at 8:54 PM Joerg Roedel <joro at 8bytes.org> wrote:
>> On Mon, Jul 31, 2023 at 02:50:23PM -0300, Jason Gunthorpe wrote:
>>> Jason Gunthorpe (10):
>>>    iommu: Remove useless group refcounting
>>>    iommu: Add a lockdep assertion for remaining dev->iommu_group reads
>>>    iommu: Add generic_single_device_group()
>>>    iommu/sun50i: Convert to generic_single_device_group()
>>>    iommu/sprd: Convert to generic_single_device_group()
>>>    iommu/rockchip: Convert to generic_single_device_group()
>>>    iommu/ipmmu-vmsa: Convert to generic_single_device_group()
>>>    iommu/omap: Convert to generic_single_device_group()
>>>    iommu: Complete the locking for dev->iommu_group
>>>    iommu/intel: Fix missing locking for show_device_domain_translation()
>>>
>>>   drivers/iommu/intel/debugfs.c  |  34 ++++----
>>>   drivers/iommu/iommu.c          | 155 +++++++++++++++++++++------------
>>>   drivers/iommu/ipmmu-vmsa.c     |  22 ++---
>>>   drivers/iommu/omap-iommu.c     |  30 +------
>>>   drivers/iommu/omap-iommu.h     |   2 +-
>>>   drivers/iommu/rockchip-iommu.c |  22 +----
>>>   drivers/iommu/sprd-iommu.c     |  24 +----
>>>   drivers/iommu/sun50i-iommu.c   |  29 ++----
>>>   include/linux/iommu.h          |   3 +
>>>   9 files changed, 138 insertions(+), 183 deletions(-)
>> Applied, thanks for the nice cleanup!
> This series seems to cause a hung task during boot on MediaTek platforms.
> It hangs with next-20230808. Reverting the 10 commits from this series
> makes the system boot up again.

I confirm that next-20230808 is broken on ARM 32bit based Exynos boards 
too. Boards lock up very early during boot. I will try to investigate 
this soon.


Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland