1#ifndef _XEN_MULTICALLS_H
2#define _XEN_MULTICALLS_H
3
4#include <trace/events/xen.h>
5
6#include "xen-ops.h"
7
8/* Multicalls */
9struct multicall_space
10{
11	struct multicall_entry *mc;
12	void *args;
13};
14
15/* Allocate room for a multicall and its args */
16struct multicall_space __xen_mc_entry(size_t args);
17
18DECLARE_PER_CPU(unsigned long, xen_mc_irq_flags);
19
20/* Call to start a batch of multiple __xen_mc_entry()s.  Must be
21   paired with xen_mc_issue() */
22static inline void xen_mc_batch(void)
23{
24	unsigned long flags;
25
26	/* need to disable interrupts until this entry is complete */
27	local_irq_save(flags);
28	trace_xen_mc_batch(paravirt_get_lazy_mode());
29	__this_cpu_write(xen_mc_irq_flags, flags);
30}
31
32static inline struct multicall_space xen_mc_entry(size_t args)
33{
34	xen_mc_batch();
35	return __xen_mc_entry(args);
36}
37
38/* Flush all pending multicalls */
39void xen_mc_flush(void);
40
41/* Issue a multicall if we're not in a lazy mode */
42static inline void xen_mc_issue(unsigned mode)
43{
44	trace_xen_mc_issue(mode);
45
46	if ((paravirt_get_lazy_mode() & mode) == 0)
47		xen_mc_flush();
48
49	/* restore flags saved in xen_mc_batch */
50	local_irq_restore(this_cpu_read(xen_mc_irq_flags));
51}
52
53/* Set up a callback to be called when the current batch is flushed */
54void xen_mc_callback(void (*fn)(void *), void *data);
55
56/*
57 * Try to extend the arguments of the previous multicall command.  The
58 * previous command's op must match.  If it does, then it attempts to
59 * extend the argument space allocated to the multicall entry by
60 * arg_size bytes.
61 *
62 * The returned multicall_space will return with mc pointing to the
63 * command on success, or NULL on failure, and args pointing to the
64 * newly allocated space.
65 */
66struct multicall_space xen_mc_extend_args(unsigned long op, size_t arg_size);
67
68#endif /* _XEN_MULTICALLS_H */
69