[src/trunk]: src/sys/arch/arm/acpi arm: ACPI: Add support for simple sharing ...

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

details:   https://anonhg.NetBSD.org/src/rev/08ae5aca2a9e
branches:  trunk
changeset: 985099:08ae5aca2a9e
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sun Aug 08 10:28:26 2021 +0000

description:
arm: ACPI: Add support for simple sharing of platform interrupts

Allow sharing of platform interrupts provided that the type, ipl, and
mpsafe-ness are the same.

diffstat:

 sys/arch/arm/acpi/acpi_machdep.c |  139 ++++++++++++++++++++++++++++++++++++--
 1 files changed, 130 insertions(+), 9 deletions(-)

diffs (177 lines):

diff -r 0dda477c89ad -r 08ae5aca2a9e sys/arch/arm/acpi/acpi_machdep.c
--- a/sys/arch/arm/acpi/acpi_machdep.c  Sun Aug 08 07:17:18 2021 +0000
+++ b/sys/arch/arm/acpi/acpi_machdep.c  Sun Aug 08 10:28:26 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: acpi_machdep.c,v 1.24 2021/08/07 18:40:45 jmcneill Exp $ */
+/* $NetBSD: acpi_machdep.c,v 1.25 2021/08/08 10:28:26 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2018 The NetBSD Foundation, Inc.
@@ -32,7 +32,7 @@
 #include "pci.h"
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: acpi_machdep.c,v 1.24 2021/08/07 18:40:45 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: acpi_machdep.c,v 1.25 2021/08/08 10:28:26 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -63,6 +63,27 @@
 extern struct arm32_bus_dma_tag acpi_coherent_dma_tag;
 extern struct arm32_bus_dma_tag arm_generic_dma_tag;
 
+struct acpi_intrhandler {
+       int                             (*ah_fn)(void *);
+       void                            *ah_arg;
+       TAILQ_ENTRY(acpi_intrhandler)   ah_list;
+};
+
+struct acpi_intrvec {
+       int                             ai_irq;
+       int                             ai_ipl;
+       int                             ai_type;
+       bool                            ai_mpsafe;
+       int                             ai_refcnt;
+       void                            *ai_arg;
+       void                            *ai_ih;
+       TAILQ_HEAD(, acpi_intrhandler)  ai_handlers;
+       TAILQ_ENTRY(acpi_intrvec)       ai_list;
+};
+
+static TAILQ_HEAD(, acpi_intrvec) acpi_intrvecs =
+    TAILQ_HEAD_INITIALIZER(acpi_intrvecs);
+
 bus_dma_tag_t  arm_acpi_dma32_tag(struct acpi_softc *, struct acpi_devnode *);
 bus_dma_tag_t  arm_acpi_dma64_tag(struct acpi_softc *, struct acpi_devnode *);
 
@@ -256,10 +277,116 @@
        cpsid(I32_bit);
 }
 
+static struct acpi_intrvec *
+acpi_md_intr_lookup(int irq)
+{
+       struct acpi_intrvec *ai;
+
+       TAILQ_FOREACH(ai, &acpi_intrvecs, ai_list) {
+               if (ai->ai_irq == irq) {
+                       return ai;
+               }
+       }
+
+       return NULL;
+}
+
+static int
+acpi_md_intr(void *arg)
+{
+       struct acpi_intrvec *ai = arg;
+       struct acpi_intrhandler *ah;
+       int rv = 0;
+
+       TAILQ_FOREACH(ah, &ai->ai_handlers, ah_list) {
+               rv += ah->ah_fn(ah->ah_arg);
+       }
+
+       return rv;
+}
+
 void *
 acpi_md_intr_establish(uint32_t irq, int ipl, int type, int (*handler)(void *), void *arg, bool mpsafe, const char *xname)
 {
-       return intr_establish_xname(irq, ipl, type | (mpsafe ? IST_MPSAFE : 0), handler, arg, xname);
+       struct acpi_intrvec *ai;
+       struct acpi_intrhandler *ah;
+
+       ai = acpi_md_intr_lookup(irq);
+       if (ai == NULL) {
+               ai = kmem_zalloc(sizeof(*ai), KM_SLEEP);
+               ai->ai_refcnt = 0;
+               ai->ai_irq = irq;
+               ai->ai_ipl = ipl;
+               ai->ai_type = type;
+               ai->ai_mpsafe = mpsafe;
+               ai->ai_arg = arg;
+               TAILQ_INIT(&ai->ai_handlers);
+               if (arg == NULL) {
+                       ai->ai_ih = intr_establish_xname(irq, ipl,
+                           type | (mpsafe ? IST_MPSAFE : 0), handler, NULL,
+                           xname);
+               } else {
+                       ai->ai_ih = intr_establish_xname(irq, ipl,
+                           type | (mpsafe ? IST_MPSAFE : 0), acpi_md_intr, ai,
+                           xname);
+               }
+               if (ai->ai_ih == NULL) {
+                       kmem_free(ai, sizeof(*ai));
+                       return NULL;
+               }
+               TAILQ_INSERT_TAIL(&acpi_intrvecs, ai, ai_list);
+       } else {
+               if (ai->ai_arg == NULL) {
+                       printf("ACPI: cannot share irq with NULL arg\n");
+                       return NULL;
+               }
+               if (ai->ai_ipl != ipl) {
+                       printf("ACPI: cannot share irq with different ipl\n");
+                       return NULL;
+               }
+               if (ai->ai_type != type) {
+                       printf("ACPI: cannot share edge and level interrupts\n");
+                       return NULL;
+               }
+               if (ai->ai_mpsafe != mpsafe) {
+                       printf("ACPI: cannot share between mpsafe/non-mpsafe\n");
+                       return NULL;
+               }
+       }
+
+       ai->ai_refcnt++;
+
+       ah = kmem_zalloc(sizeof(*ah), KM_SLEEP);
+       ah->ah_fn = handler;
+       ah->ah_arg = arg;
+       TAILQ_INSERT_TAIL(&ai->ai_handlers, ah, ah_list);
+
+       return ai->ai_ih;
+}
+
+void
+acpi_md_intr_disestablish(void *ih)
+{
+       struct acpi_intrvec *ai;
+       struct acpi_intrhandler *ah;
+
+       TAILQ_FOREACH(ai, &acpi_intrvecs, ai_list) {
+               if (ai->ai_ih == ih) {
+                       KASSERT(ai->ai_refcnt > 0);
+                       if (ai->ai_refcnt > 1) {
+                               panic("%s: cannot disestablish shared irq", __func__);
+                       }
+
+                       TAILQ_REMOVE(&acpi_intrvecs, ai, ai_list);
+                       ah = TAILQ_FIRST(&ai->ai_handlers);
+                       kmem_free(ah, sizeof(*ah));
+                       intr_disestablish(ai->ai_ih);
+                       kmem_free(ai, sizeof(*ai));
+                       return;
+               }
+       }
+
+       panic("%s: interrupt not established", __func__);
 }
 
 void
@@ -274,12 +401,6 @@
        intr_unmask(ih);
 }
 
-void
-acpi_md_intr_disestablish(void *ih)
-{
-       intr_disestablish(ih);
-}
-
 int
 acpi_md_sleep(int state)
 {