user mode can query timeline payload.
v2: check return value of copy_to_user
v3: handle querying entry by entry
v4: rebase on new chain container, simplify interface
Signed-off-by: Chunming Zhou
Cc: Daniel Rakos
Cc: Jason Ekstrand
Cc: Bas Nieuwenhuizen
Cc: Dave Airlie
Cc: Christian König
user mode can query timeline payload.
v2: check return value of copy_to_user
v3: handle querying entry by entry
v4: rebase on new chain container, simplify interface
Signed-off-by: Chunming Zhou
Cc: Daniel Rakos
Cc: Jason Ekstrand
Cc: Bas Nieuwenhuizen
Cc: Dave Airlie
Cc: Christian König
