1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __LINUX_SMP_TYPES_H
3#define __LINUX_SMP_TYPES_H
4
5#include <linux/llist.h>
6
7enum {
8 CSD_FLAG_LOCK = 0x01,
9
10 IRQ_WORK_PENDING = 0x01,
11 IRQ_WORK_BUSY = 0x02,
12 IRQ_WORK_LAZY = 0x04, /* No IPI, wait for tick */
13 IRQ_WORK_HARD_IRQ = 0x08, /* IRQ context on PREEMPT_RT */
14
15 IRQ_WORK_CLAIMED = (IRQ_WORK_PENDING | IRQ_WORK_BUSY),
16
17 CSD_TYPE_ASYNC = 0x00,
18 CSD_TYPE_SYNC = 0x10,
19 CSD_TYPE_IRQ_WORK = 0x20,
20 CSD_TYPE_TTWU = 0x30,
21
22 CSD_FLAG_TYPE_MASK = 0xF0,
23};
24
25/*
26 * struct __call_single_node is the primary type on
27 * smp.c:call_single_queue.
28 *
29 * flush_smp_call_function_queue() only reads the type from
30 * __call_single_node::u_flags as a regular load, the above
31 * (anonymous) enum defines all the bits of this word.
32 *
33 * Other bits are not modified until the type is known.
34 *
35 * CSD_TYPE_SYNC/ASYNC:
36 * struct {
37 * struct llist_node node;
38 * unsigned int flags;
39 * smp_call_func_t func;
40 * void *info;
41 * };
42 *
43 * CSD_TYPE_IRQ_WORK:
44 * struct {
45 * struct llist_node node;
46 * atomic_t flags;
47 * void (*func)(struct irq_work *);
48 * };
49 *
50 * CSD_TYPE_TTWU:
51 * struct {
52 * struct llist_node node;
53 * unsigned int flags;
54 * };
55 *
56 */
57
58struct __call_single_node {
59 struct llist_node llist;
60 union {
61 unsigned int u_flags;
62 atomic_t a_flags;
63 };
64#ifdef CONFIG_64BIT
65 u16 src, dst;
66#endif
67};
68
69#endif /* __LINUX_SMP_TYPES_H */
70