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Add gpu address support to seq64 alloc function.
v1:(Christian)
  - Add the user of this new interface change to the same
    patch.
Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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- Enable the seq64 mapping sequence.
- Fix wflinfo va conflict and other bugs.
v1:
  - The seq64 area needs to be included in the AMDGPU_VA_RESERVED_SIZE
    otherwise the areas will conflict with user space allocations (Alex)
  - It needs to be mapped read only in the user VM (Alex)
v2:
  - Instead of just one define for TOP/BOTTOM
    reserved space separate them into two (Christian)
  - Fix the CPU and VA calculations and while at it
    also cleanup error handling and kerneldoc (Christian)
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
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Developed a new driver which allocates a 64bit memory on
each request in sequence order. At the moment, user queue
fence memory is the main consumer of this seq64 driver.
v2: Worked on review comments from Christian for the following
    modifications
    - Move driver name from "semaphore" to "seq64"
    - Remove unnecessary PT/PD mapping
    - Move enable_mes check into init/fini functions.
v3: Worked on review comments from Christian
    - drop enable_mes check
    - use DECLARE_BITMAP for bit array
    - added kerneldoc for seq64
v4: Worked on review comments from Christian
    - Rename amdgpu_seq64_get name with amdgpu_seq64_alloc
v5: Worked on review comments from Christian
    - Fix seq64 lockdep warning
    - move fpriv->seq64_va check into amdgpu_seq64_unmap()
    - make the function amdgpu_seq64_unmap() return as void.
    - reserve the buffers as not interruptible.
v6: port to drm_exec (Alex)
v7: disable for now (Arun)
Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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