Commit ba1c0a49 authored Feb 03, 2016 by Paul Burton Committed by Ralf Baechle May 13, 2016

MIPS: smp-cps: Ensure our VP ident calculation is correct

When bringing up a CPU, ensure that its local ID as provided by the GIC
matches up with our calculation of it. This is vital, since if the
condition doesn't hold then we won't have configured interrupts
correctly for the VP.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: Niklas Cassel <niklas.cassel@axis.com>
Cc: Ezequiel Garcia <ezequiel.garcia@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12335/

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

parent 835d2b45

arch/mips/kernel/smp-cps.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -307,6 +307,17 @@ static void cps_init_secondary(void)
		if (cpu_has_mipsmt)
		dmt();

		if (mips_cm_revision() >= CM_REV_CM3) {
		unsigned ident = gic_read_local_vp_id();

		/*
		* Ensure that our calculation of the VP ID matches up with
		* what the GIC reports, otherwise we'll have configured
		* interrupts incorrectly.
		*/
		BUG_ON(ident != mips_cm_vp_id(smp_processor_id()));
		}

		change_c0_status(ST0_IM, STATUSF_IP2 \| STATUSF_IP3 \| STATUSF_IP4 \|
		STATUSF_IP5 \| STATUSF_IP6 \| STATUSF_IP7);
		}