11 Dec
2024
11 Dec
'24
8:15 a.m.
From: Nicolin Chen nicolinc@nvidia.com Sent: Wednesday, December 4, 2024 6:10 AM
Use it to store all vSMMU-related data. The vsid (Virtual Stream ID) will be the first use case. Then, add a rw_semaphore to protect it.
Also add a pair of arm_smmu_attach_prepare/commit_vmaster helpers and put them in the existing arm_smmu_attach_prepare/commit(). Note that identity and blocked ops don't call arm_smmu_attach_prepare/commit(), thus simply call the new helpers at the top.
Probably a dumb question. viommu is tied to a nested parent domain which cannot be identity or blocked. Why do we need to change them too?