iommu/arm-smmu-v3: Populate smmu_domain->invs when attaching masters

Update the invs array with the invalidations required by each domain type
during attachment operations.

Only an SVA domain or a paging domain will have an invs array:
 a. SVA domain will add an INV_TYPE_S1_ASID per SMMU and an INV_TYPE_ATS
    per SID

 b. Non-nesting-parent paging domain with no ATS-enabled master will add
    a single INV_TYPE_S1_ASID or INV_TYPE_S2_VMID per SMMU

 c. Non-nesting-parent paging domain with ATS-enabled master(s) will do
    (b) and add an INV_TYPE_ATS per SID

 d. Nesting-parent paging domain will add an INV_TYPE_S2_VMID followed by
    an INV_TYPE_S2_VMID_S1_CLEAR per vSMMU. For an ATS-enabled master, it
    will add an INV_TYPE_ATS_FULL per SID

 Note that case #d prepares for a future implementation of VMID allocation
 which requires a followup series for S2 domain sharing. So when a nesting
 parent domain is attached through a vSMMU instance using a nested domain.
 VMID will be allocated per vSMMU instance v.s. currectly per S2 domain.

The per-domain invalidation is not needed until the domain is attached to
a master (when it starts to possibly use TLB). This will make it possible
to attach the domain to multiple SMMUs and avoid unnecessary invalidation
overhead during teardown if no STEs/CDs refer to the domain. It also means
that when the last device is detached, the old domain must flush its ASID
or VMID, since any new iommu_unmap() call would not trigger invalidations
given an empty domain->invs array.

Introduce some arm_smmu_invs helper functions for building scratch arrays,
preparing and installing old/new domain's invalidation arrays.

Co-developed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Will Deacon <will@kernel.org>

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