[Skiboot] [PATCH 1/2] interrupts: Add an "irq_for_each_source" iterator

[Benjamin Herrenschmidt]

This will be used by subsequent XIVE reset improvements

Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
---
 core/interrupts.c    | 12 ++++++++++++
 include/interrupts.h |  6 ++++++
 2 files changed, 18 insertions(+)

diff --git a/core/interrupts.c b/core/interrupts.c
index 006d555..b9f4d14 100644
--- a/core/interrupts.c
+++ b/core/interrupts.c
@@ -126,6 +126,18 @@ struct irq_source *irq_find_source(uint32_t isn)
 	return NULL;
 }
 
+void irq_for_each_source(void (*cb)(struct irq_source *, void *), void *data)
+{
+	struct irq_source *is;
+
+	lock(&irq_lock);
+	list_for_each(&irq_sources, is, link)
+		cb(is, data);
+	list_for_each(&irq_sources2, is, link)
+		cb(is, data);
+	unlock(&irq_lock);
+}
+
 /*
  * This takes a 6-bit chip id and returns a 20 bit value representing
  * the PSI interrupt. This includes all the fields above, ie, is a
diff --git a/include/interrupts.h b/include/interrupts.h
index 7576610..0376e8f 100644
--- a/include/interrupts.h
+++ b/include/interrupts.h
@@ -301,6 +301,12 @@ extern void register_irq_source(const struct irq_source_ops *ops, void *data,
 extern void unregister_irq_source(uint32_t start, uint32_t count);
 extern struct irq_source *irq_find_source(uint32_t isn);
 
+/* Warning: callback is called with internal source lock held
+ * so don't call back into any of our irq_ APIs from it
+ */
+extern void irq_for_each_source(void (*cb)(struct irq_source *, void *),
+				void *data);
+
 extern uint32_t get_psi_interrupt(uint32_t chip_id);
 
 extern struct dt_node *add_ics_node(void);