drm/amd/display: Add control mechanism for FPU

DC invokes DC_FPU_START/END in multiple parts of the code; this can
create a situation where we invoke this FPU operation in a nested way or
exit too early. For avoiding this situation, this commit adds a
mechanism where dc_fpu_begin/end manages the access to
kernel_fpu_begin/end.

Change since V3:
- Christian: Move PPC64 code to dc_fpu_begin/end.

Change since V2:
- Christian: Do not use this_cpu_* between get/put_cpu_ptr().

Change since V1:
- Use a better variable names
- Use get_cpu_ptr and put_cpu_ptr to better balance preemption enable
and disable

Cc: Harry Wentland <[email protected]>
Cc: Anson Jacob <[email protected]>
Cc: Christian König <[email protected]>
Cc: Hersen Wu <[email protected]>
Cc: Aric Cyr <[email protected]>
Cc: Jun Lei <[email protected]>
Cc: Dmytro Laktyushkin <[email protected]>
Cc: Qingqing Zhuo <[email protected]>
Signed-off-by: Rodrigo Siqueira <[email protected]>
Reviewed-by: Christian König <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

0 files changed, 0 insertions, 0 deletions