genirq: Add IRQ_SET_MASK_OK_DONE to support stacked irqchip

Add IRQ_SET_MASK_OK_DONE in addition to IRQ_SET_MASK_OK and
IRQ_SET_MASK_OK_NOCOPY to support stacked irqchip. IRQ_SET_MASK_OK_DONE
is the same as IRQ_SET_MASK_OK to irq core. To stacked irqchip, it means
that ascendant irqchips have done all the work and no more handling
needed in descendant irqchips.

Signed-off-by: Jiang Liu <[email protected]>
Cc: Bjorn Helgaas <[email protected]>
Cc: Grant Likely <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Yingjoe Chen <[email protected]>
Cc: Yijing Wang <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>

diff --git a/include/linux/irq.h b/include/linux/irq.h
index d58e58935465594dece0d8318c02eb16b3d790a5..566b1e541323492ee3ff1ca04cdc09e990cfd07a 100644 (file)
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -114,10 +114,14 @@ enum {
  *
  * IRQ_SET_MASK_OK     - OK, core updates irq_data.affinity
  * IRQ_SET_MASK_NOCPY  - OK, chip did update irq_data.affinity
+ * IRQ_SET_MASK_OK_DONE        - Same as IRQ_SET_MASK_OK for core. Special code to
+ *                       support stacked irqchips, which indicates skipping
+ *                       all descendent irqchips.
  */
 enum {
        IRQ_SET_MASK_OK = 0,
        IRQ_SET_MASK_OK_NOCOPY,
+       IRQ_SET_MASK_OK_DONE,
 };
 
 struct msi_desc;

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 0a9104b4608b8dc374769a7435b594f27a0b97ae..80692373abd6e809b973c4be5fcad24ef52edfd7 100644 (file)
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -183,6 +183,7 @@ int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask,
        ret = chip->irq_set_affinity(data, mask, force);
        switch (ret) {
        case IRQ_SET_MASK_OK:
+       case IRQ_SET_MASK_OK_DONE:
                cpumask_copy(data->affinity, mask);
        case IRQ_SET_MASK_OK_NOCOPY:
                irq_set_thread_affinity(desc);
@@ -600,6 +601,7 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
 
        switch (ret) {
        case IRQ_SET_MASK_OK:
+       case IRQ_SET_MASK_OK_DONE:
                irqd_clear(&desc->irq_data, IRQD_TRIGGER_MASK);
                irqd_set(&desc->irq_data, flags);