[PATCH v9 3/7] iommu: Add verisilicon IOMMU driver

[Benjamin Gaignard]

Le 12/09/2025 à 13:47, Jörg Rödel a écrit :
> On Thu, Sep 11, 2025 at 05:57:13PM +0200, Benjamin Gaignard wrote:
>> The Verisilicon IOMMU hardware block can be found in combination
>> with Verisilicon hardware video codecs (encoders or decoders) on
>> different SoCs.
>> Enable it will allow us to use non contiguous memory allocators
>> for Verisilicon video codecs.
>>
>> Signed-off-by: Benjamin Gaignard <benjamin.gaignard at collabora.com>
>> ---
>>   drivers/iommu/Kconfig     |  11 +
>>   drivers/iommu/Makefile    |   1 +
>>   drivers/iommu/vsi-iommu.c | 808 ++++++++++++++++++++++++++++++++++++++
>>   include/linux/vsi-iommu.h |  21 +
>>   4 files changed, 841 insertions(+)
>>   create mode 100644 drivers/iommu/vsi-iommu.c
>>   create mode 100644 include/linux/vsi-iommu.h
> This will not go in before Will Deacons comment about code duplication with the
> Rockchip driver is addressed.

It isn't the same hardware block, not from the same IP vendor and the bits set aren't the same.
pm_runtime, clock, spin_lock aren't managed differently.
The common point is they both use 2-level page table.

VSI iommu need an additional function to restore iommu context before decoding
each frame, rockchip doesn't need it.

Regards,
Benjamin

>
> 	Joerg