The following commit has been merged into the irq/core branch of tip: Commit-ID: 90428a8eb4947f9c7c905a178f3520dc7e2ee6d2 Gitweb: https://git.kernel.org/tip/90428a8eb4947f9c7c905a178f3520dc7e2ee6d2 Author: Maulik Shah <mkshah@xxxxxxxxxxxxxx> AuthorDate: Mon, 28 Sep 2020 10:02:01 +05:30 Committer: Marc Zyngier <maz@xxxxxxxxxx> CommitterDate: Tue, 06 Oct 2020 11:23:41 +01:00 genirq/PM: Introduce IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND flag 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@xxxxxxxxxxxxx> Signed-off-by: Maulik Shah <mkshah@xxxxxxxxxxxxxx> [maz: commit message fix-up] Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx> Tested-by: Stephen Boyd <swboyd@xxxxxxxxxxxx> Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Reviewed-by: Douglas Anderson <dianders@xxxxxxxxxxxx> Link: https://lore.kernel.org/r/1601267524-20199-4-git-send-email-mkshah@xxxxxxxxxxxxxx --- include/linux/irq.h | 49 ++++++++++++++++++++++++++----------------- kernel/irq/debugfs.c | 3 +++- kernel/irq/pm.c | 34 ++++++++++++++++++++++++++---- 3 files changed, 63 insertions(+), 23 deletions(-) diff --git a/include/linux/irq.h b/include/linux/irq.h index 1b7f4df..a8b84b8 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -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; @@ -545,27 +553,30 @@ 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: 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), - 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..b6e1094 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 @@ -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[] = { diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c index c6c7e18..ce0adb2 100644 --- a/kernel/irq/pm.c +++ b/kernel/irq/pm.c @@ -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;
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