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 */ 70