Presently, we can have combination of legacy msm_iommu
or arm-smmu driver managed iommu domain. Further the page
table format also may differ in these respective managed
domains. While with arm-smmu driver, we only use armv8
page table format, with legacy msm_iommu driver we can
support both armv7s and armv8 format page tables.

Refactor the code to distinguish respective domain as to
what pagetable format it supports and accordingly call
corresponding page table parser.

Change-Id: I71479dc70d93124603f6bd5403296efa4e6dfdeb

Ensure we don't try to parse the page tables for an arm_smmu_domain
where the pgtbl_ops is NULL.

CRs-Fixed: 1034128
Change-Id: If9e63e27a052ed45ad3c187983311acdc3376579

The arm_smmu_domain is no longer stored in the iommu_domain priv
field, from kernel version 4.1 the arm_smmu_domain is a container
of iommu_domain.

Add support for this configuration.

CRs-Fixed: 1034128
Change-Id: I949ec4a24a7dedc394aedc3e6e30e64f34ca3715

Some clients can generate 48/49 bit virtual address.
Enhance ramdump parser to add support for this page
table format.

Change-Id: I46d803e7fcecadc73e0ccca3422d586c00ecc610

The `RamParse.read_word' function reads a different number of bits
depending on the architecture (it reads 32 bits on ARM and 64 bits on
ARM64). We were relying on it to only read 32 bits in a few places, so
things were broken on ARM64. Fix this by using explicitly-sized reads
where appropriate.

Change-Id: Id717787c4e7df344964387d245b732d9fffb1397

It's not always useful to pass extra data to the list walker function.
For example, if the list walker function is a class method, state can be
passed around by simply modifying class instance variables. Update
`ListWalker.walk' to accept extra arguments optionally, not require
them.

Change-Id: I433f1e34db5c143c838f0eb2ed7f58203712ccb3

The IOMMU parser currently only supports short-descriptor format page
tables but hardware supports long-descriptor format page tables. Add
support for the long-descriptor format. Most of the existing LPAE MMU
code can be re-used for this, although it must be refactored a bit.

Change-Id: I464d7edeb8818c0be9de1e1a8224bc9b478eac37

The Iommu domain parsing code is common across different Iommu page
table types (normal vs LPAE). Pull this code out so that it can be
easily re-used later when LPAE page table support is added.

Change-Id: Ifc39c12428a9c090f8197d997ddd293e0ae1f0b1