From 2dcf1fbcad352baaa5f47b17e57c5743c8eedbad Mon Sep 17 00:00:00 2001 From: Julien Thierry Date: Thu, 31 Jan 2019 14:54:00 +0000 Subject: [PATCH] genirq: Provide NMI handlers Provide flow handlers that are NMI safe for interrupts and percpu_devid interrupts. Signed-off-by: Julien Thierry Acked-by: Marc Zyngier Cc: Thomas Gleixner Cc: Marc Zyngier Cc: Peter Zijlstra Signed-off-by: Marc Zyngier --- include/linux/irq.h | 3 +++ kernel/irq/chip.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 57 insertions(+) diff --git a/include/linux/irq.h b/include/linux/irq.h index a7298e4..5e91f6b 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -601,6 +601,9 @@ extern void handle_percpu_devid_irq(struct irq_desc *desc); extern void handle_bad_irq(struct irq_desc *desc); extern void handle_nested_irq(unsigned int irq); +extern void handle_fasteoi_nmi(struct irq_desc *desc); +extern void handle_percpu_devid_fasteoi_nmi(struct irq_desc *desc); + extern int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg); extern int irq_chip_pm_get(struct irq_data *data); extern int irq_chip_pm_put(struct irq_data *data); diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index 34e9690..c32d5f3 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -730,6 +730,37 @@ out: EXPORT_SYMBOL_GPL(handle_fasteoi_irq); /** + * handle_fasteoi_nmi - irq handler for NMI interrupt lines + * @desc: the interrupt description structure for this irq + * + * A simple NMI-safe handler, considering the restrictions + * from request_nmi. + * + * Only a single callback will be issued to the chip: an ->eoi() + * call when the interrupt has been serviced. This enables support + * for modern forms of interrupt handlers, which handle the flow + * details in hardware, transparently. + */ +void handle_fasteoi_nmi(struct irq_desc *desc) +{ + struct irq_chip *chip = irq_desc_get_chip(desc); + struct irqaction *action = desc->action; + unsigned int irq = irq_desc_get_irq(desc); + irqreturn_t res; + + trace_irq_handler_entry(irq, action); + /* + * NMIs cannot be shared, there is only one action. + */ + res = action->handler(irq, action->dev_id); + trace_irq_handler_exit(irq, action, res); + + if (chip->irq_eoi) + chip->irq_eoi(&desc->irq_data); +} +EXPORT_SYMBOL_GPL(handle_fasteoi_nmi); + +/** * handle_edge_irq - edge type IRQ handler * @desc: the interrupt description structure for this irq * @@ -908,6 +939,29 @@ void handle_percpu_devid_irq(struct irq_desc *desc) chip->irq_eoi(&desc->irq_data); } +/** + * handle_percpu_devid_fasteoi_nmi - Per CPU local NMI handler with per cpu + * dev ids + * @desc: the interrupt description structure for this irq + * + * Similar to handle_fasteoi_nmi, but handling the dev_id cookie + * as a percpu pointer. + */ +void handle_percpu_devid_fasteoi_nmi(struct irq_desc *desc) +{ + struct irq_chip *chip = irq_desc_get_chip(desc); + struct irqaction *action = desc->action; + unsigned int irq = irq_desc_get_irq(desc); + irqreturn_t res; + + trace_irq_handler_entry(irq, action); + res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id)); + trace_irq_handler_exit(irq, action, res); + + if (chip->irq_eoi) + chip->irq_eoi(&desc->irq_data); +} + static void __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle, int is_chained, const char *name) -- 2.7.4