forked from luck/tmp_suning_uos_patched
genirq: Provide NMI management for percpu_devid interrupts
Add support for percpu_devid interrupts treated as NMIs. Percpu_devid NMIs need to be setup/torn down on each CPU they target. The same restrictions as for global NMIs still apply for percpu_devid NMIs. Signed-off-by: Julien Thierry <julien.thierry@arm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
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b525903c25
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4b078c3f1a
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@ -168,10 +168,15 @@ request_percpu_irq(unsigned int irq, irq_handler_t handler,
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devname, percpu_dev_id);
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}
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extern int __must_check
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request_percpu_nmi(unsigned int irq, irq_handler_t handler,
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const char *devname, void __percpu *dev);
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extern const void *free_irq(unsigned int, void *);
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extern void free_percpu_irq(unsigned int, void __percpu *);
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extern const void *free_nmi(unsigned int irq, void *dev_id);
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extern void free_percpu_nmi(unsigned int irq, void __percpu *percpu_dev_id);
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struct device;
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@ -224,7 +229,11 @@ extern bool irq_percpu_is_enabled(unsigned int irq);
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extern void irq_wake_thread(unsigned int irq, void *dev_id);
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extern void disable_nmi_nosync(unsigned int irq);
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extern void disable_percpu_nmi(unsigned int irq);
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extern void enable_nmi(unsigned int irq);
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extern void enable_percpu_nmi(unsigned int irq, unsigned int type);
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extern int prepare_percpu_nmi(unsigned int irq);
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extern void teardown_percpu_nmi(unsigned int irq);
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/* The following three functions are for the core kernel use only. */
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extern void suspend_device_irqs(void);
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@ -2182,6 +2182,11 @@ void enable_percpu_irq(unsigned int irq, unsigned int type)
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}
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EXPORT_SYMBOL_GPL(enable_percpu_irq);
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void enable_percpu_nmi(unsigned int irq, unsigned int type)
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{
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enable_percpu_irq(irq, type);
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}
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/**
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* irq_percpu_is_enabled - Check whether the per cpu irq is enabled
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* @irq: Linux irq number to check for
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@ -2221,6 +2226,11 @@ void disable_percpu_irq(unsigned int irq)
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}
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EXPORT_SYMBOL_GPL(disable_percpu_irq);
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void disable_percpu_nmi(unsigned int irq)
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{
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disable_percpu_irq(irq);
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}
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/*
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* Internal function to unregister a percpu irqaction.
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*/
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@ -2252,6 +2262,8 @@ static struct irqaction *__free_percpu_irq(unsigned int irq, void __percpu *dev_
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/* Found it - now remove it from the list of entries: */
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desc->action = NULL;
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desc->istate &= ~IRQS_NMI;
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raw_spin_unlock_irqrestore(&desc->lock, flags);
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unregister_handler_proc(irq, action);
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@ -2305,6 +2317,19 @@ void free_percpu_irq(unsigned int irq, void __percpu *dev_id)
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}
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EXPORT_SYMBOL_GPL(free_percpu_irq);
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void free_percpu_nmi(unsigned int irq, void __percpu *dev_id)
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{
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struct irq_desc *desc = irq_to_desc(irq);
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if (!desc || !irq_settings_is_per_cpu_devid(desc))
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return;
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if (WARN_ON(!(desc->istate & IRQS_NMI)))
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return;
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kfree(__free_percpu_irq(irq, dev_id));
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}
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/**
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* setup_percpu_irq - setup a per-cpu interrupt
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* @irq: Interrupt line to setup
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@ -2394,6 +2419,158 @@ int __request_percpu_irq(unsigned int irq, irq_handler_t handler,
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}
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EXPORT_SYMBOL_GPL(__request_percpu_irq);
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/**
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* request_percpu_nmi - allocate a percpu interrupt line for NMI delivery
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* @irq: Interrupt line to allocate
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* @handler: Function to be called when the IRQ occurs.
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* @name: An ascii name for the claiming device
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* @dev_id: A percpu cookie passed back to the handler function
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*
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* This call allocates interrupt resources for a per CPU NMI. Per CPU NMIs
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* have to be setup on each CPU by calling ready_percpu_nmi() before being
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* enabled on the same CPU by using enable_percpu_nmi().
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*
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* Dev_id must be globally unique. It is a per-cpu variable, and
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* the handler gets called with the interrupted CPU's instance of
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* that variable.
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*
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* Interrupt lines requested for NMI delivering should have auto enabling
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* setting disabled.
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*
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* If the interrupt line cannot be used to deliver NMIs, function
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* will fail returning a negative value.
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*/
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int request_percpu_nmi(unsigned int irq, irq_handler_t handler,
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const char *name, void __percpu *dev_id)
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{
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struct irqaction *action;
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struct irq_desc *desc;
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unsigned long flags;
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int retval;
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if (!handler)
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return -EINVAL;
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desc = irq_to_desc(irq);
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if (!desc || !irq_settings_can_request(desc) ||
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!irq_settings_is_per_cpu_devid(desc) ||
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irq_settings_can_autoenable(desc) ||
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!irq_supports_nmi(desc))
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return -EINVAL;
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/* The line cannot already be NMI */
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if (desc->istate & IRQS_NMI)
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return -EINVAL;
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action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
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if (!action)
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return -ENOMEM;
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action->handler = handler;
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action->flags = IRQF_PERCPU | IRQF_NO_SUSPEND | IRQF_NO_THREAD
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| IRQF_NOBALANCING;
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action->name = name;
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action->percpu_dev_id = dev_id;
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retval = irq_chip_pm_get(&desc->irq_data);
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if (retval < 0)
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goto err_out;
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retval = __setup_irq(irq, desc, action);
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if (retval)
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goto err_irq_setup;
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raw_spin_lock_irqsave(&desc->lock, flags);
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desc->istate |= IRQS_NMI;
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raw_spin_unlock_irqrestore(&desc->lock, flags);
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return 0;
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err_irq_setup:
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irq_chip_pm_put(&desc->irq_data);
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err_out:
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kfree(action);
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return retval;
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}
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/**
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* prepare_percpu_nmi - performs CPU local setup for NMI delivery
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* @irq: Interrupt line to prepare for NMI delivery
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*
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* This call prepares an interrupt line to deliver NMI on the current CPU,
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* before that interrupt line gets enabled with enable_percpu_nmi().
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*
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* As a CPU local operation, this should be called from non-preemptible
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* context.
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*
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* If the interrupt line cannot be used to deliver NMIs, function
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* will fail returning a negative value.
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*/
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int prepare_percpu_nmi(unsigned int irq)
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{
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unsigned long flags;
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struct irq_desc *desc;
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int ret = 0;
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WARN_ON(preemptible());
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desc = irq_get_desc_lock(irq, &flags,
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IRQ_GET_DESC_CHECK_PERCPU);
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if (!desc)
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return -EINVAL;
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if (WARN(!(desc->istate & IRQS_NMI),
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KERN_ERR "prepare_percpu_nmi called for a non-NMI interrupt: irq %u\n",
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irq)) {
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ret = -EINVAL;
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goto out;
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}
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ret = irq_nmi_setup(desc);
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if (ret) {
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pr_err("Failed to setup NMI delivery: irq %u\n", irq);
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goto out;
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}
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out:
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irq_put_desc_unlock(desc, flags);
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return ret;
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}
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/**
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* teardown_percpu_nmi - undoes NMI setup of IRQ line
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* @irq: Interrupt line from which CPU local NMI configuration should be
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* removed
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*
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* This call undoes the setup done by prepare_percpu_nmi().
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*
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* IRQ line should not be enabled for the current CPU.
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*
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* As a CPU local operation, this should be called from non-preemptible
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* context.
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*/
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void teardown_percpu_nmi(unsigned int irq)
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{
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unsigned long flags;
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struct irq_desc *desc;
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WARN_ON(preemptible());
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desc = irq_get_desc_lock(irq, &flags,
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IRQ_GET_DESC_CHECK_PERCPU);
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if (!desc)
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return;
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if (WARN_ON(!(desc->istate & IRQS_NMI)))
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goto out;
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irq_nmi_teardown(desc);
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out:
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irq_put_desc_unlock(desc, flags);
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}
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/**
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* irq_get_irqchip_state - returns the irqchip state of a interrupt.
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* @irq: Interrupt line that is forwarded to a VM
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