Alex Waterman 90d388ebf8 gpu: nvgpu: Add get/set PTE routines ...

Add new routines for accessing and modifying PTEs in situ. They are:

  __nvgpu_pte_words()
  __nvgpu_get_pte()
  __nvgpu_set_pte()

All the details of modifying a page table entry are handled within.

Note, however, that these routines will not build page tables. If a PTE
does not exist then said PTE will not be created. Instead -EINVAL will
be returned. But, keep in mind, a PTE marked as invalid still exists.
So this API can be used to mark an invalid PTE valid.

JIRA NVGPU-30

Change-Id: Ic8615f209a0c4eb6fa64af9abadcfb3b2c11ee73
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1510447
Reviewed-by: Automatic_Commit_Validation_User
Tested-by: Seema Khowala <seemaj@nvidia.com>
Reviewed-by: Seema Khowala <seemaj@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>

2017-07-12 07:44:47 -07:00

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