Patch "irqchip/mips-gic: Fix local interrupts" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

irqchip/mips-gic: Fix local interrupts

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
irqchip-mips-gic-fix-local-interrupts.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Marcin Nowakowski <[email protected]>
Date: Wed, 25 Jan 2017 15:08:25 +0100
Subject: irqchip/mips-gic: Fix local interrupts

From: Marcin Nowakowski <[email protected]>

commit 4cfffcfa5106492f5785924ce2e9af49f075999b upstream.

Some local interrupts are not initialised properly at the moment and cannot be used since the domain's alloc method is never called for them.

This has been observed earlier and partially fixed in commit e875bd66dfb ("irqchip/mips-gic: Fix local interrupts"), but that change still relied on the interrupt to be requested by an external driver (eg. drivers/clocksource/mips-gic-timer.c).

This does however not solve the issue for interrupts that are not referenced by any driver through the device tree and results in request_irq() calls returning -ENOSYS. It can be observed when attempting to use perf tool to access hardware performance counters.

Fix this by explicitly calling irq_create_fwspec_mapping() for local interrupts.

---
 drivers/irqchip/irq-mips-gic.c |   29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

@@ -968,6 +968,34 @@ static struct irq_domain_ops gic_ipi_dom
 	.match = gic_ipi_domain_match,
 };
 
+static void __init gic_map_single_int(struct device_node *node,
+				      unsigned int irq)
+{
+	unsigned int linux_irq;
+	struct irq_fwspec local_int_fwspec = {
+		.fwnode         = &node->fwnode,
+		.param_count    = 3,
+		.param          = {
+			[0]     = GIC_LOCAL,
+			[1]     = irq,
+			[2]     = IRQ_TYPE_NONE,
+		},
+	};
+
+	if (!gic_local_irq_is_routable(irq))
+		return;
+
+	linux_irq = irq_create_fwspec_mapping(&local_int_fwspec);
+	WARN_ON(!linux_irq);
+}
+
+static void __init gic_map_interrupts(struct device_node *node)
+{
+	gic_map_single_int(node, GIC_LOCAL_INT_TIMER);
+	gic_map_single_int(node, GIC_LOCAL_INT_PERFCTR);
+	gic_map_single_int(node, GIC_LOCAL_INT_FDC);
+}
+
 static void __init __gic_init(unsigned long gic_base_addr,
 			      unsigned long gic_addrspace_size,
 			      unsigned int cpu_vec, unsigned int irqbase,

@@ -1067,6 +1095,7 @@ static void __init __gic_init(unsigned l
 	}
 
 	gic_basic_init();
+	gic_map_interrupts(node);
 }
 
 void __init gic_init(unsigned long gic_base_addr,

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/irqchip-mips-gic-fix-local-interrupts.patch