[src/trunk]: src/sys/arch/arm/cortex - Use pic_do_pending_ints in intr handler

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

details:   https://anonhg.NetBSD.org/src/rev/1308cb23295e
branches:  trunk
changeset: 965192:1308cb23295e
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Thu Sep 05 13:33:11 2019 +0000

description:
- Use pic_do_pending_ints in intr handler
- Sprinkle isb
- Fix PMR bits detection on eMAG, from OpenBSD

diffstat:

 sys/arch/arm/cortex/gicv3.c |  36 +++++++++++++++++++++++++++---------
 1 files changed, 27 insertions(+), 9 deletions(-)

diffs (99 lines):

diff -r 516086ec3ae7 -r 1308cb23295e sys/arch/arm/cortex/gicv3.c
--- a/sys/arch/arm/cortex/gicv3.c       Thu Sep 05 12:57:30 2019 +0000
+++ b/sys/arch/arm/cortex/gicv3.c       Thu Sep 05 13:33:11 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: gicv3.c,v 1.20 2019/06/30 11:11:38 jmcneill Exp $ */
+/* $NetBSD: gicv3.c,v 1.21 2019/09/05 13:33:11 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 1.20 2019/06/30 11:11:38 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: gicv3.c,v 1.21 2019/09/05 13:33:11 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/kernel.h>
@@ -213,6 +213,7 @@
        struct gicv3_softc * const sc = PICTOSOFTC(pic);
 
        icc_pmr_write(IPL_TO_PMR(sc, ipl));
+       arm_isb();
 }
 
 static void
@@ -437,14 +438,17 @@
                        if ((ci->ci_gic_sgir & ICC_SGIR_EL1_Aff) != aff) {
                                if (targets != 0) {
                                        icc_sgi1r_write(intid | aff | targets);
+                                       arm_isb();
                                        targets = 0;
                                }
                                aff = (ci->ci_gic_sgir & ICC_SGIR_EL1_Aff);
                        }
                        targets |= (ci->ci_gic_sgir & ICC_SGIR_EL1_TargetList);
                }
-               if (targets != 0)
+               if (targets != 0) {
                        icc_sgi1r_write(intid | aff | targets);
+                       arm_isb();
+               }
        }
 }
 
@@ -715,6 +719,7 @@
 
        for (;;) {
                const uint32_t iar = icc_iar1_read();
+               arm_dsb();
                const uint32_t irq = __SHIFTOUT(iar, ICC_IAR_INTID);
                if (irq == ICC_IAR_INTID_SPURIOUS)
                        break;
@@ -726,26 +731,39 @@
                struct intrsource * const is = pic->pic_sources[irq - pic->pic_irqbase];
                KASSERT(is != NULL);
 
+               const bool early_eoi = irq < GIC_LPI_BASE && is->is_type == IST_EDGE;
+
                const int ipl = is->is_ipl;
-               if (ci->ci_cpl < ipl)
-                       pic_set_priority(ci, ipl);
+               if (__predict_false(ipl < ci->ci_cpl)) {
+                       pic_do_pending_ints(I32_bit, ipl, frame);
+               } else {
+                       gicv3_set_priority(pic, ipl);
+                       ci->ci_cpl = ipl;
+               }
+
+               if (early_eoi) {
+                       icc_eoi1r_write(iar);
+                       arm_isb();
+               }
 
                cpsie(I32_bit);
                pic_dispatch(is, frame);
                cpsid(I32_bit);
 
-               icc_eoi1r_write(iar);
+               if (!early_eoi) {
+                       icc_eoi1r_write(iar);
+                       arm_isb();
+               }
        }
 
-       if (ci->ci_cpl != oldipl)
-               pic_set_priority(ci, oldipl);
+       pic_do_pending_ints(I32_bit, oldipl, frame);
 }
 
 static int
 gicv3_detect_pmr_bits(struct gicv3_softc *sc)
 {
        const uint32_t opmr = icc_pmr_read();
-       icc_pmr_write(0xff);
+       icc_pmr_write(0xbf);
        const uint32_t npmr = icc_pmr_read();
        icc_pmr_write(opmr);