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Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001#ifndef _XEN_MULTICALLS_H
2#define _XEN_MULTICALLS_H
3
4#include "xen-ops.h"
5
6/* Multicalls */
7struct multicall_space
8{
9 struct multicall_entry *mc;
10 void *args;
11};
12
13/* Allocate room for a multicall and its args */
14struct multicall_space __xen_mc_entry(size_t args);
15
16DECLARE_PER_CPU(unsigned long, xen_mc_irq_flags);
17
18/* Call to start a batch of multiple __xen_mc_entry()s. Must be
19 paired with xen_mc_issue() */
20static inline void xen_mc_batch(void)
21{
Jeremy Fitzhardinge06fc7322009-02-03 16:01:46 -080022 unsigned long flags;
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -070023 /* need to disable interrupts until this entry is complete */
Jeremy Fitzhardinge06fc7322009-02-03 16:01:46 -080024 local_irq_save(flags);
25 __get_cpu_var(xen_mc_irq_flags) = flags;
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -070026}
27
28static inline struct multicall_space xen_mc_entry(size_t args)
29{
30 xen_mc_batch();
31 return __xen_mc_entry(args);
32}
33
34/* Flush all pending multicalls */
35void xen_mc_flush(void);
36
37/* Issue a multicall if we're not in a lazy mode */
38static inline void xen_mc_issue(unsigned mode)
39{
Jeremy Fitzhardinge8965c1c2007-10-16 11:51:29 -070040 if ((paravirt_get_lazy_mode() & mode) == 0)
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -070041 xen_mc_flush();
42
43 /* restore flags saved in xen_mc_batch */
Ingo Molnar6dbde352009-01-15 22:15:53 +090044 local_irq_restore(percpu_read(xen_mc_irq_flags));
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -070045}
46
Jeremy Fitzhardinge91e0c5f2007-10-16 11:51:30 -070047/* Set up a callback to be called when the current batch is flushed */
48void xen_mc_callback(void (*fn)(void *), void *data);
49
Jeremy Fitzhardinge400d3492008-06-16 04:30:03 -070050/*
51 * Try to extend the arguments of the previous multicall command. The
52 * previous command's op must match. If it does, then it attempts to
53 * extend the argument space allocated to the multicall entry by
54 * arg_size bytes.
55 *
56 * The returned multicall_space will return with mc pointing to the
57 * command on success, or NULL on failure, and args pointing to the
58 * newly allocated space.
59 */
60struct multicall_space xen_mc_extend_args(unsigned long op, size_t arg_size);
61
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -070062#endif /* _XEN_MULTICALLS_H */