summaryrefslogtreecommitdiffstats
path: root/kernel/include/linux/irq_work.h
diff options
context:
space:
mode:
authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/include/linux/irq_work.h
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/include/linux/irq_work.h')
-rw-r--r--kernel/include/linux/irq_work.h55
1 files changed, 55 insertions, 0 deletions
diff --git a/kernel/include/linux/irq_work.h b/kernel/include/linux/irq_work.h
new file mode 100644
index 000000000..0e427a999
--- /dev/null
+++ b/kernel/include/linux/irq_work.h
@@ -0,0 +1,55 @@
+#ifndef _LINUX_IRQ_WORK_H
+#define _LINUX_IRQ_WORK_H
+
+#include <linux/llist.h>
+
+/*
+ * An entry can be in one of four states:
+ *
+ * free NULL, 0 -> {claimed} : free to be used
+ * claimed NULL, 3 -> {pending} : claimed to be enqueued
+ * pending next, 3 -> {busy} : queued, pending callback
+ * busy NULL, 2 -> {free, claimed} : callback in progress, can be claimed
+ */
+
+#define IRQ_WORK_PENDING 1UL
+#define IRQ_WORK_BUSY 2UL
+#define IRQ_WORK_FLAGS 3UL
+#define IRQ_WORK_LAZY 4UL /* Doesn't want IPI, wait for tick */
+#define IRQ_WORK_HARD_IRQ 8UL /* Run hard IRQ context, even on RT */
+
+struct irq_work {
+ unsigned long flags;
+ struct llist_node llnode;
+ void (*func)(struct irq_work *);
+};
+
+static inline
+void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *))
+{
+ work->flags = 0;
+ work->func = func;
+}
+
+#define DEFINE_IRQ_WORK(name, _f) struct irq_work name = { .func = (_f), }
+
+bool irq_work_queue(struct irq_work *work);
+
+#ifdef CONFIG_SMP
+bool irq_work_queue_on(struct irq_work *work, int cpu);
+#endif
+
+void irq_work_tick(void);
+void irq_work_sync(struct irq_work *work);
+
+#ifdef CONFIG_IRQ_WORK
+#include <asm/irq_work.h>
+
+void irq_work_run(void);
+bool irq_work_needs_cpu(void);
+#else
+static inline bool irq_work_needs_cpu(void) { return false; }
+static inline void irq_work_run(void) { }
+#endif
+
+#endif /* _LINUX_IRQ_WORK_H */