[PATCH 18/23] iommu: Express DMA strictness via the domain type

[Lu Baolu]

On 2021/7/26 16:27, Robin Murphy wrote:
> On 2021-07-24 06:29, Lu Baolu wrote:
>> Hi Robin,
>>
>> On 2021/7/22 2:20, Robin Murphy wrote:
>>> Eliminate the iommu_get_dma_strict() indirection and pipe the
>>> information through the domain type from the beginning. Besides
>>> the flow simplification this also has several nice side-effects:
>>>
>>>   - Automatically implies strict mode for untrusted devices by
>>>     virtue of their IOMMU_DOMAIN_DMA override.
>>>   - Ensures that we only ends up using flush queues for drivers
>>>     which are aware of them and can actually benefit.
>>
>> Is this expressed by vendor iommu driver has ops->flush_iotlb_all?
> 
> No, it's literally whether ->domain_alloc accepts the DMA_DOMAIN_FQ type 
> or not.

Get it. Thank you!

Best regards,
baolu