LXR linux/include/linux/smp

   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