[Skiboot] [PATCH v2 1/5] xive, interrupts: Add a mask() source op

[Oliver O'Halloran]

We want to be able to mask LSIs from inside of skiboot. For P9 most of
the actual interrupt wrangling is internal to the XIVE driver, so we
need to provide a way for XIVE based interrupt sources to mask
and interrupt. Do this by adding a mask() function to the interrupt
source ops structure.

Signed-off-by: Oliver O'Halloran <oohall at gmail.com>
---
v2: patch added in v2
---
 hw/xive.c            | 18 ++++++++++++++++++
 include/interrupts.h |  1 +
 include/xive.h       |  1 +
 3 files changed, 20 insertions(+)

diff --git a/hw/xive.c b/hw/xive.c
index 76b41a9ee95f..ea970de7898e 100644
--- a/hw/xive.c
+++ b/hw/xive.c
@@ -2705,6 +2705,23 @@ static void xive_source_eoi(struct irq_source *is, uint32_t isn)
 		__xive_source_eoi(is, isn);
 }
 
+void __xive_source_mask(struct irq_source *is, uint32_t isn)
+{
+	struct xive_src *s = container_of(is, struct xive_src, is);
+
+	xive_update_irq_mask(s, isn - s->esb_base, true);
+}
+
+static void xive_source_mask(struct irq_source *is, uint32_t isn)
+{
+	struct xive_src *s = container_of(is, struct xive_src, is);
+
+	if (s->orig_ops && s->orig_ops->eoi)
+		s->orig_ops->mask(is, isn);
+	else
+		__xive_source_mask(is, isn);
+}
+
 static void xive_source_interrupt(struct irq_source *is, uint32_t isn)
 {
 	struct xive_src *s = container_of(is, struct xive_src, is);
@@ -2739,6 +2756,7 @@ static const struct irq_source_ops xive_irq_source_ops = {
 	.interrupt = xive_source_interrupt,
 	.attributes = xive_source_attributes,
 	.name = xive_source_name,
+	.mask = xive_source_mask,
 };
 
 static void __xive_register_source(struct xive *x, struct xive_src *s,
diff --git a/include/interrupts.h b/include/interrupts.h
index d1ee5c4c112b..a8c44be2217b 100644
--- a/include/interrupts.h
+++ b/include/interrupts.h
@@ -153,6 +153,7 @@ struct irq_source_ops {
 	void (*interrupt)(struct irq_source *is, uint32_t isn);
 	void (*eoi)(struct irq_source *is, uint32_t isn);
 	char *(*name)(struct irq_source *is, uint32_t isn);
+	void (*mask)(struct irq_source *is, uint32_t isn);
 };
 
 struct irq_source {
diff --git a/include/xive.h b/include/xive.h
index 4100e7127784..b1f4b82ee041 100644
--- a/include/xive.h
+++ b/include/xive.h
@@ -511,5 +511,6 @@ void *xive_get_trigger_port(uint32_t girq);
 /* To be used by special EOI override in PSI */
 struct irq_source;
 void __xive_source_eoi(struct irq_source *is, uint32_t isn);
+void __xive_source_mask(struct irq_source *is, uint32_t isn);
 
 #endif /* __XIVE_H__ */
-- 
2.21.0