Commit d6f7fe3b authored by Nathan Lynch's avatar Nathan Lynch Committed by Michael Ellerman
Browse files

powerpc/pseries: drop RTAS-based timebase synchronization 



The pseries platform has been LPAR-only for several generations, and
the PAPR spec:

* Guarantees that timebase synchronization is performed by
  the platform ("The timebase registers are synchronized by the
  platform before CPUs are given to the OS" - 7.3.8 SMP Support).

* Completely omits the RTAS freeze-time-base and thaw-time-base RTAS
  functions, which are CHRP artifacts.

This code is effectively unused on currently supported models, so drop
it.

Signed-off-by: default avatarNathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20230125-b4-powerpc-rtas-queue-v3-7-26929c8cce78@linux.ibm.com
parent 836b5b9f

arch/powerpc/platforms/pseries/smp.c

+0 −6
Original line number Diff line number Diff line
@@ -278,11 +278,5 @@ void __init smp_init_pseries(void) 
		cpumask_clear_cpu(boot_cpuid, of_spin_mask);

	}



	/* Non-lpar has additional take/give timebase */

	if (rtas_token("freeze-time-base") != RTAS_UNKNOWN_SERVICE) {

		smp_ops->give_timebase = rtas_give_timebase;

		smp_ops->take_timebase = rtas_take_timebase;

	}



	pr_debug(" <- smp_init_pSeries()\n");

}