include/linux/smp_types.h

   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
   7 enum {
   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
  58 struct __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 */