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genirq/PM: Introduce IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND flag

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

To that effect, introduce the IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND flag.
If the irqchip have this flag set, the irq PM code will enable/unmask
the irqs that are marked for wakeup, but that are in a disabled state.

On resume, such irqs will be restored back to their disabled state.

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>
[maz: commit message fix-up]
Signed-off-by: Marc Zyngier <maz@kernel.org>
Tested-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/1601267524-20199-4-git-send-email-mkshah@codeaurora.org
This commit is contained in:
Maulik Shah 2020-09-28 10:02:01 +05:30 committed by Marc Zyngier
parent f41aaca593
commit 90428a8eb4
3 changed files with 63 additions and 23 deletions
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13
include/linux/irq.h
View File

@ -215,6 +215,8 @@ struct irq_data {
* from actual interrupt context.
* IRQD_AFFINITY_ON_ACTIVATE - Affinity is set on activation. Don't call
* irq_chip::irq_set_affinity() when deactivated.
* IRQD_IRQ_ENABLED_ON_SUSPEND - Interrupt is enabled on suspend by irq pm if
* irqchip have flag IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND set.
*/
enum {
IRQD_TRIGGER_MASK = 0xf,
@ -240,6 +242,7 @@ enum {
IRQD_MSI_NOMASK_QUIRK = (1 << 27),
IRQD_HANDLE_ENFORCE_IRQCTX = (1 << 28),
IRQD_AFFINITY_ON_ACTIVATE = (1 << 29),
IRQD_IRQ_ENABLED_ON_SUSPEND = (1 << 30),
};
#define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors)
@ -319,6 +322,11 @@ static inline bool irqd_is_handle_enforce_irqctx(struct irq_data *d)
return __irqd_to_state(d) & IRQD_HANDLE_ENFORCE_IRQCTX;
}
static inline bool irqd_is_enabled_on_suspend(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_IRQ_ENABLED_ON_SUSPEND;
}
static inline bool irqd_is_wakeup_set(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_WAKEUP_STATE;
@ -553,8 +561,10 @@ struct irq_chip {
* 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_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: Invokes __enable_irq()/__disable_irq() for wake irqs
* in the suspend path if they are in disabled state
*/
enum {
IRQCHIP_SET_TYPE_MASKED = (1 << 0),
@ -566,6 +576,7 @@ enum {
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>

3
kernel/irq/debugfs.c
View File

@ -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
@ -125,6 +126,8 @@ static const struct irq_bit_descr irqdata_states[] = {
BIT_MASK_DESCR(IRQD_DEFAULT_TRIGGER_SET),
BIT_MASK_DESCR(IRQD_HANDLE_ENFORCE_IRQCTX),
BIT_MASK_DESCR(IRQD_IRQ_ENABLED_ON_SUSPEND),
};
static const struct irq_bit_descr irqdesc_states[] = {

34
kernel/irq/pm.c
View File

@ -69,12 +69,26 @@ 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;
struct irq_data *irqd = &desc->irq_data;
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 (irqd_is_wakeup_set(irqd)) {
irqd_set(irqd, IRQD_WAKEUP_ARMED);
if ((chipflags & IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND) &&
irqd_irq_disabled(irqd)) {
/*
* Interrupt marked for wakeup is in disabled state.
* Enable interrupt here to unmask/enable in irqchip
* to be able to resume with such interrupts.
*/
__enable_irq(desc);
irqd_set(irqd, IRQD_IRQ_ENABLED_ON_SUSPEND);
}
/*
* We return true here to force the caller to issue
* synchronize_irq(). We need to make sure that the
@ -93,7 +107,7 @@ 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;
}
@ -137,7 +151,19 @@ EXPORT_SYMBOL_GPL(suspend_device_irqs);
static void resume_irq(struct irq_desc *desc)
{
irqd_clear(&desc->irq_data, IRQD_WAKEUP_ARMED);
struct irq_data *irqd = &desc->irq_data;
irqd_clear(irqd, IRQD_WAKEUP_ARMED);
if (irqd_is_enabled_on_suspend(irqd)) {
/*
* Interrupt marked for wakeup was enabled during suspend
* entry. Disable such interrupts to restore them back to
* original state.
*/
__disable_irq(desc);
irqd_clear(irqd, IRQD_IRQ_ENABLED_ON_SUSPEND);
}
if (desc->istate & IRQS_SUSPENDED)
goto resume;