1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _XEN_MULTICALLS_H
3 #define _XEN_MULTICALLS_H
5 #include <trace/events/xen.h>
10 struct multicall_space
12 struct multicall_entry *mc;
16 /* Allocate room for a multicall and its args */
17 struct multicall_space __xen_mc_entry(size_t args);
19 DECLARE_PER_CPU(unsigned long, xen_mc_irq_flags);
21 /* Call to start a batch of multiple __xen_mc_entry()s. Must be
22 paired with xen_mc_issue() */
23 static inline void xen_mc_batch(void)
27 /* need to disable interrupts until this entry is complete */
28 local_irq_save(flags);
29 trace_xen_mc_batch(paravirt_get_lazy_mode());
30 __this_cpu_write(xen_mc_irq_flags, flags);
33 static inline struct multicall_space xen_mc_entry(size_t args)
36 return __xen_mc_entry(args);
39 /* Flush all pending multicalls */
40 void xen_mc_flush(void);
42 /* Issue a multicall if we're not in a lazy mode */
43 static inline void xen_mc_issue(unsigned mode)
45 trace_xen_mc_issue(mode);
47 if ((paravirt_get_lazy_mode() & mode) == 0)
50 /* restore flags saved in xen_mc_batch */
51 local_irq_restore(this_cpu_read(xen_mc_irq_flags));
54 /* Set up a callback to be called when the current batch is flushed */
55 void xen_mc_callback(void (*fn)(void *), void *data);
58 * Try to extend the arguments of the previous multicall command. The
59 * previous command's op must match. If it does, then it attempts to
60 * extend the argument space allocated to the multicall entry by
63 * The returned multicall_space will return with mc pointing to the
64 * command on success, or NULL on failure, and args pointing to the
65 * newly allocated space.
67 struct multicall_space xen_mc_extend_args(unsigned long op, size_t arg_size);
69 #endif /* _XEN_MULTICALLS_H */