Generalize IPI support for ARM intrng and use it for interrupt

controller IPI provider.

New struct intr_ipi is defined which keeps all info about an IPI:
its name, counter, send and dispatch methods. Generic intr_ipi_setup(),
intr_ipi_send() and intr_ipi_dispatch() functions are implemented.

An IPI provider must implement two functions:
(1) an intr_ipi_send_t function which is able to send an IPI,
(2) a setup function which initializes itself for an IPI and
    calls intr_ipi_setup() with appropriate arguments.

Differential Revision:	https://reviews.freebsd.org/D5700

2 files changed, 23 insertions, 10 deletions

diff --git a/sys/kern/pic_if.m b/sys/kern/pic_if.m
index 2309f0c9fd9f..04d5f5f1afad 100644
--- a/sys/kern/pic_if.m
+++ b/sys/kern/pic_if.m
@@ -60,6 +60,13 @@ CODE {
 	{
 		return;
 	}
+
+	static int
+	dflt_pic_ipi_setup(device_t dev, u_int ipi, struct intr_irqsrc *isrc)
+	{
+
+		return (EOPNOTSUPP);
+	}
 };
 
 METHOD int register {
@@ -122,3 +129,9 @@ METHOD void ipi_send {
 	struct intr_irqsrc	*isrc;
 	cpuset_t		cpus;
 } DEFAULT null_pic_ipi_send;
+
+METHOD int ipi_setup {
+	device_t		dev;
+	u_int			ipi;
+	struct intr_irqsrc	*isrc;
+} DEFAULT dflt_pic_ipi_setup;
diff --git a/sys/kern/subr_intr.c b/sys/kern/subr_intr.c
index 1c97fd48af21..a92c642afe4d 100644
--- a/sys/kern/subr_intr.c
+++ b/sys/kern/subr_intr.c
@@ -311,8 +311,8 @@ intr_irq_dispatch(struct intr_irqsrc *isrc, struct trapframe *tf)
 /*
  *  Allocate interrupt source.
  */
-static struct intr_irqsrc *
-isrc_alloc(u_int type, u_int extsize)
+struct intr_irqsrc *
+intr_isrc_alloc(u_int type, u_int extsize)
 {
 	struct intr_irqsrc *isrc;
 
@@ -329,8 +329,8 @@ isrc_alloc(u_int type, u_int extsize)
 /*
  *  Free interrupt source.
  */
-static void
-isrc_free(struct intr_irqsrc *isrc)
+void
+intr_isrc_free(struct intr_irqsrc *isrc)
 {
 
 	free(isrc, M_INTRNG);
@@ -462,20 +462,20 @@ intr_namespace_map_irq(device_t dev, uint16_t type, uint16_t num)
 	struct intr_irqsrc *isrc, *new_isrc;
 	int error;
 
-	new_isrc = isrc_alloc(INTR_ISRCT_NAMESPACE, 0);
+	new_isrc = intr_isrc_alloc(INTR_ISRCT_NAMESPACE, 0);
 
 	mtx_lock(&isrc_table_lock);
 	isrc = isrc_namespace_lookup(dev, type, num);
 	if (isrc != NULL) {
 		mtx_unlock(&isrc_table_lock);
-		isrc_free(new_isrc);
+		intr_isrc_free(new_isrc);
 		return (isrc->isrc_irq);	/* already mapped */
 	}
 
 	error = isrc_alloc_irq_locked(new_isrc);
 	if (error != 0) {
 		mtx_unlock(&isrc_table_lock);
-		isrc_free(new_isrc);
+		intr_isrc_free(new_isrc);
 		return (IRQ_INVALID);		/* no space left */
 	}
 
@@ -526,20 +526,20 @@ intr_fdt_map_irq(phandle_t node, pcell_t *cells, u_int ncells)
 	xref = (intptr_t)node;	/* It's so simple for now. */
 
 	cellsize = ncells * sizeof(*cells);
-	new_isrc = isrc_alloc(INTR_ISRCT_FDT, cellsize);
+	new_isrc = intr_isrc_alloc(INTR_ISRCT_FDT, cellsize);
 
 	mtx_lock(&isrc_table_lock);
 	isrc = isrc_fdt_lookup(xref, cells, ncells);
 	if (isrc != NULL) {
 		mtx_unlock(&isrc_table_lock);
-		isrc_free(new_isrc);
+		intr_isrc_free(new_isrc);
 		return (isrc->isrc_irq);	/* already mapped */
 	}
 
 	error = isrc_alloc_irq_locked(new_isrc);
 	if (error != 0) {
 		mtx_unlock(&isrc_table_lock);
-		isrc_free(new_isrc);
+		intr_isrc_free(new_isrc);
 		return (IRQ_INVALID);		/* no space left */
 	}