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-rw-r--r--kernel/workqueue_internal.h81
1 files changed, 81 insertions, 0 deletions
diff --git a/kernel/workqueue_internal.h b/kernel/workqueue_internal.h
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+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * kernel/workqueue_internal.h
+ *
+ * Workqueue internal header file. Only to be included by workqueue and
+ * core kernel subsystems.
+ */
+#ifndef _KERNEL_WORKQUEUE_INTERNAL_H
+#define _KERNEL_WORKQUEUE_INTERNAL_H
+
+#include <linux/workqueue.h>
+#include <linux/kthread.h>
+#include <linux/preempt.h>
+
+struct worker_pool;
+
+/*
+ * The poor guys doing the actual heavy lifting. All on-duty workers are
+ * either serving the manager role, on idle list or on busy hash. For
+ * details on the locking annotation (L, I, X...), refer to workqueue.c.
+ *
+ * Only to be used in workqueue and async.
+ */
+struct worker {
+ /* on idle list while idle, on busy hash table while busy */
+ union {
+ struct list_head entry; /* L: while idle */
+ struct hlist_node hentry; /* L: while busy */
+ };
+
+ struct work_struct *current_work; /* L: work being processed */
+ work_func_t current_func; /* L: current_work's fn */
+ struct pool_workqueue *current_pwq; /* L: current_work's pwq */
+ unsigned int current_color; /* L: current_work's color */
+ struct list_head scheduled; /* L: scheduled works */
+
+ /* 64 bytes boundary on 64bit, 32 on 32bit */
+
+ struct task_struct *task; /* I: worker task */
+ struct worker_pool *pool; /* A: the associated pool */
+ /* L: for rescuers */
+ struct list_head node; /* A: anchored at pool->workers */
+ /* A: runs through worker->node */
+
+ unsigned long last_active; /* L: last active timestamp */
+ unsigned int flags; /* X: flags */
+ int id; /* I: worker id */
+ int sleeping; /* None */
+
+ /*
+ * Opaque string set with work_set_desc(). Printed out with task
+ * dump for debugging - WARN, BUG, panic or sysrq.
+ */
+ char desc[WORKER_DESC_LEN];
+
+ /* used only by rescuers to point to the target workqueue */
+ struct workqueue_struct *rescue_wq; /* I: the workqueue to rescue */
+
+ /* used by the scheduler to determine a worker's last known identity */
+ work_func_t last_func;
+};
+
+/**
+ * current_wq_worker - return struct worker if %current is a workqueue worker
+ */
+static inline struct worker *current_wq_worker(void)
+{
+ if (in_task() && (current->flags & PF_WQ_WORKER))
+ return kthread_data(current);
+ return NULL;
+}
+
+/*
+ * Scheduler hooks for concurrency managed workqueue. Only to be used from
+ * sched/ and workqueue.c.
+ */
+void wq_worker_running(struct task_struct *task);
+void wq_worker_sleeping(struct task_struct *task);
+work_func_t wq_worker_last_func(struct task_struct *task);
+
+#endif /* _KERNEL_WORKQUEUE_INTERNAL_H */