v4.19.13 snapshot.
diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h
new file mode 100644
index 0000000..dd1e40d
--- /dev/null
+++ b/include/linux/irqdesc.h
@@ -0,0 +1,275 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_IRQDESC_H
+#define _LINUX_IRQDESC_H
+
+#include <linux/rcupdate.h>
+#include <linux/kobject.h>
+#include <linux/mutex.h>
+
+/*
+ * Core internal functions to deal with irq descriptors
+ */
+
+struct irq_affinity_notify;
+struct proc_dir_entry;
+struct module;
+struct irq_desc;
+struct irq_domain;
+struct pt_regs;
+
+/**
+ * struct irq_desc - interrupt descriptor
+ * @irq_common_data: per irq and chip data passed down to chip functions
+ * @kstat_irqs: irq stats per cpu
+ * @handle_irq: highlevel irq-events handler
+ * @preflow_handler: handler called before the flow handler (currently used by sparc)
+ * @action: the irq action chain
+ * @status: status information
+ * @core_internal_state__do_not_mess_with_it: core internal status information
+ * @depth: disable-depth, for nested irq_disable() calls
+ * @wake_depth: enable depth, for multiple irq_set_irq_wake() callers
+ * @irq_count: stats field to detect stalled irqs
+ * @last_unhandled: aging timer for unhandled count
+ * @irqs_unhandled: stats field for spurious unhandled interrupts
+ * @threads_handled: stats field for deferred spurious detection of threaded handlers
+ * @threads_handled_last: comparator field for deferred spurious detection of theraded handlers
+ * @lock: locking for SMP
+ * @affinity_hint: hint to user space for preferred irq affinity
+ * @affinity_notify: context for notification of affinity changes
+ * @pending_mask: pending rebalanced interrupts
+ * @threads_oneshot: bitfield to handle shared oneshot threads
+ * @threads_active: number of irqaction threads currently running
+ * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers
+ * @nr_actions: number of installed actions on this descriptor
+ * @no_suspend_depth: number of irqactions on a irq descriptor with
+ * IRQF_NO_SUSPEND set
+ * @force_resume_depth: number of irqactions on a irq descriptor with
+ * IRQF_FORCE_RESUME set
+ * @rcu: rcu head for delayed free
+ * @kobj: kobject used to represent this struct in sysfs
+ * @request_mutex: mutex to protect request/free before locking desc->lock
+ * @dir: /proc/irq/ procfs entry
+ * @debugfs_file: dentry for the debugfs file
+ * @name: flow handler name for /proc/interrupts output
+ */
+struct irq_desc {
+ struct irq_common_data irq_common_data;
+ struct irq_data irq_data;
+ unsigned int __percpu *kstat_irqs;
+ irq_flow_handler_t handle_irq;
+#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
+ irq_preflow_handler_t preflow_handler;
+#endif
+ struct irqaction *action; /* IRQ action list */
+ unsigned int status_use_accessors;
+ unsigned int core_internal_state__do_not_mess_with_it;
+ unsigned int depth; /* nested irq disables */
+ unsigned int wake_depth; /* nested wake enables */
+ unsigned int irq_count; /* For detecting broken IRQs */
+ unsigned long last_unhandled; /* Aging timer for unhandled count */
+ unsigned int irqs_unhandled;
+ atomic_t threads_handled;
+ int threads_handled_last;
+ raw_spinlock_t lock;
+ struct cpumask *percpu_enabled;
+ const struct cpumask *percpu_affinity;
+#ifdef CONFIG_SMP
+ const struct cpumask *affinity_hint;
+ struct irq_affinity_notify *affinity_notify;
+#ifdef CONFIG_GENERIC_PENDING_IRQ
+ cpumask_var_t pending_mask;
+#endif
+#endif
+ unsigned long threads_oneshot;
+ atomic_t threads_active;
+ wait_queue_head_t wait_for_threads;
+#ifdef CONFIG_PM_SLEEP
+ unsigned int nr_actions;
+ unsigned int no_suspend_depth;
+ unsigned int cond_suspend_depth;
+ unsigned int force_resume_depth;
+#endif
+#ifdef CONFIG_PROC_FS
+ struct proc_dir_entry *dir;
+#endif
+#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
+ struct dentry *debugfs_file;
+ const char *dev_name;
+#endif
+#ifdef CONFIG_SPARSE_IRQ
+ struct rcu_head rcu;
+ struct kobject kobj;
+#endif
+ struct mutex request_mutex;
+ int parent_irq;
+ struct module *owner;
+ const char *name;
+} ____cacheline_internodealigned_in_smp;
+
+#ifdef CONFIG_SPARSE_IRQ
+extern void irq_lock_sparse(void);
+extern void irq_unlock_sparse(void);
+#else
+static inline void irq_lock_sparse(void) { }
+static inline void irq_unlock_sparse(void) { }
+extern struct irq_desc irq_desc[NR_IRQS];
+#endif
+
+static inline struct irq_desc *irq_data_to_desc(struct irq_data *data)
+{
+ return container_of(data->common, struct irq_desc, irq_common_data);
+}
+
+static inline unsigned int irq_desc_get_irq(struct irq_desc *desc)
+{
+ return desc->irq_data.irq;
+}
+
+static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
+{
+ return &desc->irq_data;
+}
+
+static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
+{
+ return desc->irq_data.chip;
+}
+
+static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
+{
+ return desc->irq_data.chip_data;
+}
+
+static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
+{
+ return desc->irq_common_data.handler_data;
+}
+
+/*
+ * Architectures call this to let the generic IRQ layer
+ * handle an interrupt.
+ */
+static inline void generic_handle_irq_desc(struct irq_desc *desc)
+{
+ desc->handle_irq(desc);
+}
+
+int generic_handle_irq(unsigned int irq);
+
+#ifdef CONFIG_HANDLE_DOMAIN_IRQ
+/*
+ * Convert a HW interrupt number to a logical one using a IRQ domain,
+ * and handle the result interrupt number. Return -EINVAL if
+ * conversion failed. Providing a NULL domain indicates that the
+ * conversion has already been done.
+ */
+int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
+ bool lookup, struct pt_regs *regs);
+
+static inline int handle_domain_irq(struct irq_domain *domain,
+ unsigned int hwirq, struct pt_regs *regs)
+{
+ return __handle_domain_irq(domain, hwirq, true, regs);
+}
+#endif
+
+/* Test to see if a driver has successfully requested an irq */
+static inline int irq_desc_has_action(struct irq_desc *desc)
+{
+ return desc->action != NULL;
+}
+
+static inline int irq_has_action(unsigned int irq)
+{
+ return irq_desc_has_action(irq_to_desc(irq));
+}
+
+/**
+ * irq_set_handler_locked - Set irq handler from a locked region
+ * @data: Pointer to the irq_data structure which identifies the irq
+ * @handler: Flow control handler function for this interrupt
+ *
+ * Sets the handler in the irq descriptor associated to @data.
+ *
+ * Must be called with irq_desc locked and valid parameters. Typical
+ * call site is the irq_set_type() callback.
+ */
+static inline void irq_set_handler_locked(struct irq_data *data,
+ irq_flow_handler_t handler)
+{
+ struct irq_desc *desc = irq_data_to_desc(data);
+
+ desc->handle_irq = handler;
+}
+
+/**
+ * irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region
+ * @data: Pointer to the irq_data structure for which the chip is set
+ * @chip: Pointer to the new irq chip
+ * @handler: Flow control handler function for this interrupt
+ * @name: Name of the interrupt
+ *
+ * Replace the irq chip at the proper hierarchy level in @data and
+ * sets the handler and name in the associated irq descriptor.
+ *
+ * Must be called with irq_desc locked and valid parameters.
+ */
+static inline void
+irq_set_chip_handler_name_locked(struct irq_data *data, struct irq_chip *chip,
+ irq_flow_handler_t handler, const char *name)
+{
+ struct irq_desc *desc = irq_data_to_desc(data);
+
+ desc->handle_irq = handler;
+ desc->name = name;
+ data->chip = chip;
+}
+
+static inline bool irq_balancing_disabled(unsigned int irq)
+{
+ struct irq_desc *desc;
+
+ desc = irq_to_desc(irq);
+ return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
+}
+
+static inline bool irq_is_percpu(unsigned int irq)
+{
+ struct irq_desc *desc;
+
+ desc = irq_to_desc(irq);
+ return desc->status_use_accessors & IRQ_PER_CPU;
+}
+
+static inline bool irq_is_percpu_devid(unsigned int irq)
+{
+ struct irq_desc *desc;
+
+ desc = irq_to_desc(irq);
+ return desc->status_use_accessors & IRQ_PER_CPU_DEVID;
+}
+
+static inline void
+irq_set_lockdep_class(unsigned int irq, struct lock_class_key *lock_class,
+ struct lock_class_key *request_class)
+{
+ struct irq_desc *desc = irq_to_desc(irq);
+
+ if (desc) {
+ lockdep_set_class(&desc->lock, lock_class);
+ lockdep_set_class(&desc->request_mutex, request_class);
+ }
+}
+
+#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
+static inline void
+__irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
+{
+ struct irq_desc *desc;
+
+ desc = irq_to_desc(irq);
+ desc->preflow_handler = handler;
+}
+#endif
+
+#endif