[src/trunk]: src/sys/arch/aarch64 Do not try to initialize PMU if ID_AA64DFR0...

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/5e878272b17d
branches:  trunk
changeset: 379781:5e878272b17d
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sat Jun 19 13:40:00 2021 +0000

description:
Do not try to initialize PMU if ID_AA64DFR0_EL1 reports a non-standard
PMU implementation.

diffstat:

 sys/arch/aarch64/aarch64/cpu.c    |  8 ++++++--
 sys/arch/aarch64/include/armreg.h |  3 ++-
 2 files changed, 8 insertions(+), 3 deletions(-)

diffs (46 lines):

diff -r 604b90e9531d -r 5e878272b17d sys/arch/aarch64/aarch64/cpu.c
--- a/sys/arch/aarch64/aarch64/cpu.c    Sat Jun 19 13:38:21 2021 +0000
+++ b/sys/arch/aarch64/aarch64/cpu.c    Sat Jun 19 13:40:00 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: cpu.c,v 1.59 2021/03/09 16:44:27 ryo Exp $ */
+/* $NetBSD: cpu.c,v 1.60 2021/06/19 13:40:00 jmcneill Exp $ */
 
 /*
  * Copyright (c) 2017 Ryo Shimizu <ryo%nerv.org@localhost>
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(1, "$NetBSD: cpu.c,v 1.59 2021/03/09 16:44:27 ryo Exp $");
+__KERNEL_RCSID(1, "$NetBSD: cpu.c,v 1.60 2021/06/19 13:40:00 jmcneill Exp $");
 
 #include "locators.h"
 #include "opt_arm_debug.h"
@@ -486,6 +486,10 @@ cpu_init_counter(struct cpu_info *ci)
                /* Performance Monitors Extension not implemented. */
                return;
        }
+       if (pmuver == ID_AA64DFR0_EL1_PMUVER_IMPL) {
+               /* Non-standard Performance Monitors are not supported. */
+               return;
+       }
 
        reg_pmcr_el0_write(PMCR_E | PMCR_C);
        reg_pmcntenset_el0_write(PMCNTEN_C);
diff -r 604b90e9531d -r 5e878272b17d sys/arch/aarch64/include/armreg.h
--- a/sys/arch/aarch64/include/armreg.h Sat Jun 19 13:38:21 2021 +0000
+++ b/sys/arch/aarch64/include/armreg.h Sat Jun 19 13:40:00 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: armreg.h,v 1.56 2021/06/19 13:38:21 jmcneill Exp $ */
+/* $NetBSD: armreg.h,v 1.57 2021/06/19 13:40:00 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2014 The NetBSD Foundation, Inc.
@@ -248,6 +248,7 @@ AARCH64REG_READ_INLINE(id_aa64dfr0_el1)
 #define         ID_AA64DFR0_EL1_PMUVER_NONE     0
 #define         ID_AA64DFR0_EL1_PMUVER_V3       1
 #define         ID_AA64DFR0_EL1_PMUVER_NOV3     2
+#define         ID_AA64DFR0_EL1_PMUVER_IMPL     15
 #define        ID_AA64DFR0_EL1_TRACEVER        __BITS(4,7)
 #define         ID_AA64DFR0_EL1_TRACEVER_NONE   0
 #define         ID_AA64DFR0_EL1_TRACEVER_IMPL   1