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9c4f78ec |
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12-Mar-2018 |
John Grossman <johngro@google.com> |
[iommu][ihda] Update Intel HDA driver to use IOMMU/BTI
Update the Intel HDA driver to start using the IOMMU and BTI
primatives now being exposed by zircon. This introduces some new
internal utility classes (PinnedVMOs) and eliminates a number of
others. It also takes care of some log standing TODOs (eg; how do we
pin our pages?)
Also, do a general cleanup pass on some of the style in this driver.
It was written before many utility classes and libraries, and so it
was not taking advantage of some of the runtime safety these classes
can provide. In specific...
++ Raw handles are no longer used, everything is managed using libzx
now.
++ fbl::VmoMapper and fbl::VmarManager are now used to manage register
mapping and to corral all mapped registers into a single sub-vmar
in an attempt to be kind to the page table entry allocator in the
kernel.
++ The use of AllocChecker has been restored. This code had been
moved up into the garnet layer for a while and therefor stopped
using AllocChecker. Now that it is back in zircon, best practice
is to check for allocation failure and handle it gracefully instead
of allowing programs to terminate if allocation fails.
Change-Id: I1ca483fb70fe85650b8ba576f5e234a869f9ce9e
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