genirq: Allow the irqchip state of an IRQ to be save/restored

There is a number of cases where a kernel subsystem may want to
introspect the state of an interrupt at the irqchip level:

- When a peripheral is shared between virtual machines,
  its interrupt state becomes part of the guest's state,
  and must be switched accordingly. KVM on arm/arm64 requires
  this for its guest-visible timer
- Some GPIO controllers seem to require peeking into the
  interrupt controller they are connected to to report
  their internal state

This seem to be a pattern that is common enough for the core code
to try and support this without too many horrible hacks. Introduce
a pair of accessors (irq_get_irqchip_state/irq_set_irqchip_state)
to retrieve the bits that can be of interest to another subsystem:
pending, active, and masked.

- irq_get_irqchip_state returns the state of the interrupt according
  to a parameter set to IRQCHIP_STATE_PENDING, IRQCHIP_STATE_ACTIVE,
  IRQCHIP_STATE_MASKED or IRQCHIP_STATE_LINE_LEVEL.
- irq_set_irqchip_state similarly sets the state of the interrupt.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Tested-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: Phong Vo <pvo@apm.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Tin Huynh <tnhuynh@apm.com>
Cc: Y Vo <yvo@apm.com>
Cc: Toan Le <toanle@apm.com>
Cc: Bjorn Andersson <bjorn@kryo.se>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Link: http://lkml.kernel.org/r/1426676484-21812-2-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 91 insertions, 0 deletions

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index c0a1100d911f..e68932bb308e 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -1798,3 +1798,94 @@ int request_percpu_irq(unsigned int irq, irq_handler_t handler,
 
         return retval;
 }
+
+/**
+ *      irq_get_irqchip_state - returns the irqchip state of a interrupt.
+ *      @irq: Interrupt line that is forwarded to a VM
+ *      @which: One of IRQCHIP_STATE_* the caller wants to know about
+ *      @state: a pointer to a boolean where the state is to be storeed
+ *
+ *      This call snapshots the internal irqchip state of an
+ *      interrupt, returning into @state the bit corresponding to
+ *      stage @which
+ *
+ *      This function should be called with preemption disabled if the
+ *      interrupt controller has per-cpu registers.
+ */
+int irq_get_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
+                          bool *state)
+{
+        struct irq_desc *desc;
+        struct irq_data *data;
+        struct irq_chip *chip;
+        unsigned long flags;
+        int err = -EINVAL;
+
+        desc = irq_get_desc_buslock(irq, &flags, 0);
+        if (!desc)
+                return err;
+
+        data = irq_desc_get_irq_data(desc);
+
+        do {
+                chip = irq_data_get_irq_chip(data);
+                if (chip->irq_get_irqchip_state)
+                        break;
+#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
+                data = data->parent_data;
+#else
+                data = NULL;
+#endif
+        } while (data);
+
+        if (data)
+                err = chip->irq_get_irqchip_state(data, which, state);
+
+        irq_put_desc_busunlock(desc, flags);
+        return err;
+}
+
+/**
+ *      irq_set_irqchip_state - set the state of a forwarded interrupt.
+ *      @irq: Interrupt line that is forwarded to a VM
+ *      @which: State to be restored (one of IRQCHIP_STATE_*)
+ *      @val: Value corresponding to @which
+ *
+ *      This call sets the internal irqchip state of an interrupt,
+ *      depending on the value of @which.
+ *
+ *      This function should be called with preemption disabled if the
+ *      interrupt controller has per-cpu registers.
+ */
+int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
+                          bool val)
+{
+        struct irq_desc *desc;
+        struct irq_data *data;
+        struct irq_chip *chip;
+        unsigned long flags;
+        int err = -EINVAL;
+
+        desc = irq_get_desc_buslock(irq, &flags, 0);
+        if (!desc)
+                return err;
+
+        data = irq_desc_get_irq_data(desc);
+
+        do {
+                chip = irq_data_get_irq_chip(data);
+                if (chip->irq_set_irqchip_state)
+                        break;
+#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
+                data = data->parent_data;
+#else
+                data = NULL;
+#endif
+        } while (data);
+
+        if (data)
+                err = chip->irq_set_irqchip_state(data, which, val);
+
+        irq_put_desc_busunlock(desc, flags);
+        return err;
+}