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[src/trunk]: src/sys/arch/arm/pic Inline "pic_do_pending_ints" in splx and ch...



details:   https://anonhg.NetBSD.org/src/rev/4a747819ec78
branches:  trunk
changeset: 1018892:4a747819ec78
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sat Feb 20 19:30:46 2021 +0000

description:
Inline "pic_do_pending_ints" in splx and check ci_pending_ipls to optimize
the common case (hw priority, no cascaded interrupts pending).

This also removes the need for the "pic_pending_used" flag, and should fix
booting on Raspberry Pi 3.

diffstat:

 sys/arch/arm/pic/pic.c          |  16 +--------
 sys/arch/arm/pic/pic_splfuncs.c |  65 ++++++++++++++++++----------------------
 sys/arch/arm/pic/picvar.h       |   4 +-
 3 files changed, 36 insertions(+), 49 deletions(-)

diffs (187 lines):

diff -r a850397f0c56 -r 4a747819ec78 sys/arch/arm/pic/pic.c
--- a/sys/arch/arm/pic/pic.c    Sat Feb 20 19:27:35 2021 +0000
+++ b/sys/arch/arm/pic/pic.c    Sat Feb 20 19:30:46 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pic.c,v 1.66 2021/02/20 14:51:07 jmcneill Exp $        */
+/*     $NetBSD: pic.c,v 1.67 2021/02/20 19:30:46 jmcneill Exp $        */
 /*-
  * Copyright (c) 2008 The NetBSD Foundation, Inc.
  * All rights reserved.
@@ -33,7 +33,7 @@
 #include "opt_multiprocessor.h"
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pic.c,v 1.66 2021/02/20 14:51:07 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pic.c,v 1.67 2021/02/20 19:30:46 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/atomic.h>
@@ -60,8 +60,6 @@
 
 #if defined(__HAVE_PIC_PENDING_INTRS)
 
-bool pic_pending_used __read_mostly = false;
-
 /*
  * This implementation of pending interrupts on a MULTIPROCESSOR system makes
  * the assumption that a PIC (pic_softc) shall only have all its interrupts
@@ -74,8 +72,6 @@
        pic_list_find_pic_by_pending_ipl(struct cpu_info *, uint32_t);
 static void
        pic_deliver_irqs(struct cpu_info *, struct pic_softc *, int, void *);
-static void
-       pic_list_deliver_irqs(struct cpu_info *, register_t, int, void *);
 
 #endif /* __HAVE_PIC_PENDING_INTRS */
 
@@ -261,9 +257,6 @@
        const uint32_t ipl_mask = __BIT(is->is_ipl);
        struct cpu_info * const ci = curcpu();
 
-       if (!pic_pending_used)
-               pic_pending_used = true;
-
        atomic_or_32(&pic->pic_pending_irqs[is->is_irq >> 5],
            __BIT(is->is_irq & 0x1f));
 
@@ -296,9 +289,6 @@
        if (pending == 0)
                return ipl_mask;
 
-       if (!pic_pending_used)
-               pic_pending_used = true;
-
        KASSERT((irq_base & 31) == 0);
 
        (*pic->pic_ops->pic_block_irqs)(pic, irq_base, pending);
@@ -480,7 +470,7 @@
                atomic_and_32(&ci->ci_pending_pics, ~__BIT(pic->pic_id));
 }
 
-static void
+void
 pic_list_unblock_irqs(struct cpu_info *ci)
 {
        uint32_t blocked_pics = ci->ci_blocked_pics;
diff -r a850397f0c56 -r 4a747819ec78 sys/arch/arm/pic/pic_splfuncs.c
--- a/sys/arch/arm/pic/pic_splfuncs.c   Sat Feb 20 19:27:35 2021 +0000
+++ b/sys/arch/arm/pic/pic_splfuncs.c   Sat Feb 20 19:30:46 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pic_splfuncs.c,v 1.13 2021/02/16 22:12:50 jmcneill Exp $       */
+/*     $NetBSD: pic_splfuncs.c,v 1.14 2021/02/20 19:30:46 jmcneill Exp $       */
 /*-
  * Copyright (c) 2008 The NetBSD Foundation, Inc.
  * All rights reserved.
@@ -28,7 +28,7 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pic_splfuncs.c,v 1.13 2021/02/16 22:12:50 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pic_splfuncs.c,v 1.14 2021/02/20 19:30:46 jmcneill Exp $");
 
 #define _INTR_PRIVATE
 #include <sys/param.h>
@@ -46,12 +46,6 @@
 
 #include <arm/pic/picvar.h>
 
-#if defined(__HAVE_PIC_PENDING_INTRS)
-extern bool pic_pending_used;
-#else
-#define pic_pending_used       false
-#endif
-
 int
 _splraise(int newipl)
 {
@@ -70,16 +64,12 @@
        const int oldipl = ci->ci_cpl;
        KASSERT(panicstr || newipl <= ci->ci_cpl);
        if (newipl < ci->ci_cpl) {
-               if (__predict_false(pic_pending_used)) {
-                       register_t psw = cpsid(I32_bit);
-                       ci->ci_intr_depth++;
-                       pic_do_pending_ints(psw, newipl, NULL);
-                       ci->ci_intr_depth--;
-                       if ((psw & I32_bit) == 0 || newipl == IPL_NONE)
-                               cpsie(I32_bit);
-               } else {
-                       pic_set_priority(ci, newipl);
-               }
+               register_t psw = cpsid(I32_bit);
+               ci->ci_intr_depth++;
+               pic_do_pending_ints(psw, newipl, NULL);
+               ci->ci_intr_depth--;
+               if ((psw & I32_bit) == 0 || newipl == IPL_NONE)
+                       cpsie(I32_bit);
                cpu_dosoftints();
        }
        return oldipl;
@@ -95,27 +85,32 @@
                return;
        }
 
-       if (__predict_false(pic_pending_used)) {
-               register_t psw = cpsid(I32_bit);
-               KASSERTMSG(panicstr != NULL || savedipl < ci->ci_cpl,
-                   "splx(%d) to a higher ipl than %d", savedipl, ci->ci_cpl);
+       register_t psw = cpsid(I32_bit);
+
+#if defined(__HAVE_PIC_PENDING_INTRS)
+       if (__predict_true(ci->ci_pending_ipls == 0)) {
+               goto skip_pending;
+       }
 
-               if ((psw & I32_bit) == 0) {
-                       ci->ci_intr_depth++;
-                       pic_do_pending_ints(psw, savedipl, NULL);
-                       ci->ci_intr_depth--;
-                       KASSERTMSG(ci->ci_cpl == savedipl, "cpl %d savedipl %d",
-                           ci->ci_cpl, savedipl);
+       while ((ci->ci_pending_ipls & ~__BIT(savedipl)) > __BIT(savedipl)) {
+               KASSERT(ci->ci_pending_ipls < __BIT(NIPL));
+               for (;;) {
+                       int ipl = 31 - __builtin_clz(ci->ci_pending_ipls);
+                       KASSERT(ipl < NIPL);
+                       if (ipl <= savedipl) {
+                               break;
+                       }
 
-                       cpsie(I32_bit);
-                       cpu_dosoftints();
-               } else {
-                       pic_set_priority_psw(ci, psw, savedipl);
+                       pic_set_priority_psw(ci, psw, ipl);
+                       pic_list_deliver_irqs(ci, psw, ipl, NULL);
+                       pic_list_unblock_irqs(ci);
                }
-       } else {
-               pic_set_priority(ci, savedipl);
-               cpu_dosoftints();
        }
+skip_pending:
+#endif
+
+       pic_set_priority_psw(ci, psw, savedipl);
+       cpu_dosoftints();
 
        KASSERTMSG(ci->ci_cpl == savedipl, "cpl %d savedipl %d",
            ci->ci_cpl, savedipl);
diff -r a850397f0c56 -r 4a747819ec78 sys/arch/arm/pic/picvar.h
--- a/sys/arch/arm/pic/picvar.h Sat Feb 20 19:27:35 2021 +0000
+++ b/sys/arch/arm/pic/picvar.h Sat Feb 20 19:30:46 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: picvar.h,v 1.29 2021/02/20 18:18:53 jmcneill Exp $     */
+/*     $NetBSD: picvar.h,v 1.30 2021/02/20 19:30:46 jmcneill Exp $     */
 /*-
  * Copyright (c) 2008 The NetBSD Foundation, Inc.
  * All rights reserved.
@@ -73,6 +73,8 @@
 void   pic_mark_pending_source(struct pic_softc *pic, struct intrsource *is);
 uint32_t pic_mark_pending_sources(struct pic_softc *pic, size_t irq_base,
            uint32_t pending);
+void   pic_list_deliver_irqs(struct cpu_info *, register_t, int, void *);
+void   pic_list_unblock_irqs(struct cpu_info *);
 #endif /* __HAVE_PIC_PENDING_INTRS */
 void   *pic_establish_intr(struct pic_softc *pic, int irq, int ipl, int type,
            int (*func)(void *), void *arg, const char *);



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