[PATCH v5 3/6] genirq/PM: Introduce IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND flag

Maulik Shah
2020-08-22T16:18:31Z

An interrupt that is disabled/masked but set for wakeup still
needs to be able to wake up the system from sleep states like
"suspend to RAM".

Introduce IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND flag. If this flag
is set wake irqs will get enabled/unmasked on suspend entry by
invoking .irq_enable/.irq_unmask callback of irqchip.

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>
---
include/linux/irq.h | 41 ++++++++++++++++++++++-------------------
kernel/irq/debugfs.c | 1 +
kernel/irq/pm.c | 7 ++++++-
3 files changed, 29 insertions(+), 20 deletions(-)

diff --git a/include/linux/irq.h b/include/linux/irq.h
index 1b7f4df..752eb9a 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -545,27 +545,30 @@ struct irq_chip {
/*
* irq_chip specific flags
*
- * IRQCHIP_SET_TYPE_MASKED: Mask before calling chip.irq_set_type()
- * IRQCHIP_EOI_IF_HANDLED: Only issue irq_eoi() when irq was handled
- * IRQCHIP_MASK_ON_SUSPEND: Mask non wake irqs in the suspend path
- * IRQCHIP_ONOFFLINE_ENABLED: Only call irq_on/off_line callbacks
- * when irq enabled
- * IRQCHIP_SKIP_SET_WAKE: Skip chip.irq_set_wake(), for this irq chip
- * IRQCHIP_ONESHOT_SAFE: One shot does not require mask/unmask
- * IRQCHIP_EOI_THREADED: Chip requires eoi() on unmask in threaded mode
- * IRQCHIP_SUPPORTS_LEVEL_MSI Chip can provide two doorbells for Level MSIs
- * IRQCHIP_SUPPORTS_NMI: Chip can deliver NMIs, only for root irqchips
+ * IRQCHIP_SET_TYPE_MASKED: Mask before calling chip.irq_set_type()
+ * IRQCHIP_EOI_IF_HANDLED: Only issue irq_eoi() when irq was handled
+ * IRQCHIP_MASK_ON_SUSPEND: Mask non wake irqs in the suspend path
+ * IRQCHIP_ONOFFLINE_ENABLED: Only call irq_on/off_line callbacks
+ * when irq enabled
+ * IRQCHIP_SKIP_SET_WAKE: Skip chip.irq_set_wake(), for this irq chip
+ * IRQCHIP_ONESHOT_SAFE: One shot does not require mask/unmask
+ * IRQCHIP_EOI_THREADED: Chip requires eoi() on unmask in threaded mode
+ * IRQCHIP_SUPPORTS_LEVEL_MSI: Chip can provide two doorbells for Level MSIs
+ * IRQCHIP_SUPPORTS_NMI: Chip can deliver NMIs, only for root irqchips
+ * IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND: Invoke .irq_enable/.irq_unmask for wake irqs
+ * in the suspend path
*/
enum {
- IRQCHIP_SET_TYPE_MASKED = (1 << 0),
- IRQCHIP_EOI_IF_HANDLED = (1 << 1),
- IRQCHIP_MASK_ON_SUSPEND = (1 << 2),
- IRQCHIP_ONOFFLINE_ENABLED = (1 << 3),
- IRQCHIP_SKIP_SET_WAKE = (1 << 4),
- IRQCHIP_ONESHOT_SAFE = (1 << 5),
- IRQCHIP_EOI_THREADED = (1 << 6),
- IRQCHIP_SUPPORTS_LEVEL_MSI = (1 << 7),
- IRQCHIP_SUPPORTS_NMI = (1 << 8),
+ IRQCHIP_SET_TYPE_MASKED = (1 << 0),
+ IRQCHIP_EOI_IF_HANDLED = (1 << 1),
+ IRQCHIP_MASK_ON_SUSPEND = (1 << 2),
+ IRQCHIP_ONOFFLINE_ENABLED = (1 << 3),
+ IRQCHIP_SKIP_SET_WAKE = (1 << 4),
+ IRQCHIP_ONESHOT_SAFE = (1 << 5),
+ IRQCHIP_EOI_THREADED = (1 << 6),
+ IRQCHIP_SUPPORTS_LEVEL_MSI = (1 << 7),
+ IRQCHIP_SUPPORTS_NMI = (1 << 8),
+ IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND = (1 << 9),
};

#include <linux/irqdesc.h>
diff --git a/kernel/irq/debugfs.c b/kernel/irq/debugfs.c
index b95ff5d..ab4f637 100644
--- a/kernel/irq/debugfs.c
+++ b/kernel/irq/debugfs.c
@@ -57,6 +57,7 @@ static const struct irq_bit_descr irqchip_flags[] = {
BIT_MASK_DESCR(IRQCHIP_EOI_THREADED),
BIT_MASK_DESCR(IRQCHIP_SUPPORTS_LEVEL_MSI),
BIT_MASK_DESCR(IRQCHIP_SUPPORTS_NMI),
+ BIT_MASK_DESCR(IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND),
};

static void
diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c
index c6c7e18..2cc800b 100644
--- a/kernel/irq/pm.c
+++ b/kernel/irq/pm.c
@@ -69,12 +69,17 @@ void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action)

static bool suspend_device_irq(struct irq_desc *desc)
{
+ unsigned long chipflags = irq_desc_get_chip(desc)->flags;
+
if (!desc->action || irq_desc_is_chained(desc) ||
desc->no_suspend_depth)
return false;

if (irqd_is_wakeup_set(&desc->irq_data)) {
irqd_set(&desc->irq_data, IRQD_WAKEUP_ARMED);
+
+ if (chipflags & IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND)
+ irq_enable(desc);
/*
* We return true here to force the caller to issue
* synchronize_irq(). We need to make sure that the
@@ -93,7 +98,7 @@ static bool suspend_device_irq(struct irq_desc *desc)
* chip level. The chip implementation indicates that with
* IRQCHIP_MASK_ON_SUSPEND.
*/
- if (irq_desc_get_chip(desc)->flags & IRQCHIP_MASK_ON_SUSPEND)
+ if (chipflags & IRQCHIP_MASK_ON_SUSPEND)
mask_irq(desc);
return true;
}
--
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