irqchip/gic-v3-its: Generalize LPI configuration

We're are going to need to change a bit more than just the enable
bit in the LPI property table in the future. So let's change the
LPI configuration funtion to take a set of bits to be cleared,
and a set of bits to be set.

This way, we'll be able to use it when a guest updates an LPI
property (priority, for example).

Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 15a007f..19ce99b 100644 (file)
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -684,17 +684,18 @@ static inline u32 its_get_event_id(struct irq_data *d)
        return d->hwirq - its_dev->event_map.lpi_base;
 }
 
-static void lpi_set_config(struct irq_data *d, bool enable)
+static void lpi_update_config(struct irq_data *d, u8 clr, u8 set)
 {
        struct its_device *its_dev = irq_data_get_irq_chip_data(d);
        irq_hw_number_t hwirq = d->hwirq;
-       u32 id = its_get_event_id(d);
-       u8 *cfg = page_address(gic_rdists->prop_page) + hwirq - 8192;
+       struct page *prop_page;
+       u8 *cfg;
 
-       if (enable)
-               *cfg |= LPI_PROP_ENABLED;
-       else
-               *cfg &= ~LPI_PROP_ENABLED;
+       prop_page = gic_rdists->prop_page;
+
+       cfg = page_address(prop_page) + hwirq - 8192;
+       *cfg &= ~clr;
+       *cfg |= set;
 
        /*
         * Make the above write visible to the redistributors.
@@ -705,17 +706,17 @@ static void lpi_set_config(struct irq_data *d, bool enable)
                gic_flush_dcache_to_poc(cfg, sizeof(*cfg));
        else
                dsb(ishst);
-       its_send_inv(its_dev, id);
+       its_send_inv(its_dev, its_get_event_id(d));
 }
 
 static void its_mask_irq(struct irq_data *d)
 {
-       lpi_set_config(d, false);
+       lpi_update_config(d, LPI_PROP_ENABLED, 0);
 }
 
 static void its_unmask_irq(struct irq_data *d)
 {
-       lpi_set_config(d, true);
+       lpi_update_config(d, 0, LPI_PROP_ENABLED);
 }
 
 static int its_set_affinity(struct irq_data *d, const struct cpumask *mask_val,