[src/trunk]: src/sys/arch/arm/cortex gicv3_ipi_send: simplify logic in kcp !=...

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

details:   https://anonhg.NetBSD.org/src/rev/bfc52e73b3aa
branches:  trunk
changeset: 941885:bfc52e73b3aa
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sun Nov 01 11:03:44 2020 +0000

description:
gicv3_ipi_send: simplify logic in kcp != NULL case given that we know that
the kcpuset will only ever contain one cpu.

diffstat:

 sys/arch/arm/cortex/gicv3.c |  37 +++++++++++--------------------------
 1 files changed, 11 insertions(+), 26 deletions(-)

diffs (66 lines):

diff -r 09ba7df4c962 -r bfc52e73b3aa sys/arch/arm/cortex/gicv3.c
--- a/sys/arch/arm/cortex/gicv3.c       Sun Nov 01 10:58:59 2020 +0000
+++ b/sys/arch/arm/cortex/gicv3.c       Sun Nov 01 11:03:44 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: gicv3.c,v 1.26 2020/10/30 18:54:36 skrll Exp $ */
+/* $NetBSD: gicv3.c,v 1.27 2020/11/01 11:03:44 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2018 Jared McNeill <jmcneill%invisible.ca@localhost>
@@ -31,7 +31,7 @@
 #define        _INTR_PRIVATE
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: gicv3.c,v 1.26 2020/10/30 18:54:36 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: gicv3.c,v 1.27 2020/11/01 11:03:44 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/kernel.h>
@@ -419,38 +419,23 @@
 static void
 gicv3_ipi_send(struct pic_softc *pic, const kcpuset_t *kcp, u_long ipi)
 {
-       CPU_INFO_ITERATOR cii;
        struct cpu_info *ci;
-       uint64_t intid, aff, targets;
+       uint64_t sgir;
 
-       intid = __SHIFTIN(ipi, ICC_SGIR_EL1_INTID);
+       sgir = __SHIFTIN(ipi, ICC_SGIR_EL1_INTID);
        if (kcp == NULL) {
                /* Interrupts routed to all PEs, excluding "self" */
                if (ncpu == 1)
                        return;
-               icc_sgi1r_write(intid | ICC_SGIR_EL1_IRM);
+               sgir |= ICC_SGIR_EL1_IRM;
        } else {
-               /* Interrupts routed to specific PEs */
-               aff = 0;
-               targets = 0;
-               for (CPU_INFO_FOREACH(cii, ci)) {
-                       if (!kcpuset_isset(kcp, cpu_index(ci)))
-                               continue;
-                       if ((ci->ci_gic_sgir & ICC_SGIR_EL1_Aff) != aff) {
-                               if (targets != 0) {
-                                       icc_sgi1r_write(intid | aff | targets);
-                                       isb();
-                                       targets = 0;
-                               }
-                               aff = (ci->ci_gic_sgir & ICC_SGIR_EL1_Aff);
-                       }
-                       targets |= (ci->ci_gic_sgir & ICC_SGIR_EL1_TargetList);
-               }
-               if (targets != 0) {
-                       icc_sgi1r_write(intid | aff | targets);
-                       isb();
-               }
+               /* Interrupt to exactly one PE */
+               ci = cpu_lookup(kcpuset_ffs(kcp) - 1);
+               if (ci == curcpu())
+                       return;
+               sgir |= ci->ci_gic_sgir;
        }
+       icc_sgi1r_write(sgir);
 }
 
 static void