1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _XEN_MULTICALLS_H
 3#define _XEN_MULTICALLS_H
 4
 5#include <trace/events/xen.h>
 6
 7#include "xen-ops.h"
 8
 9/* Multicalls */
10struct multicall_space
11{
12	struct multicall_entry *mc;
13	void *args;
14};
15
16/* Allocate room for a multicall and its args */
17struct multicall_space __xen_mc_entry(size_t args);
18
19DECLARE_PER_CPU(unsigned long, xen_mc_irq_flags);
20
21/* Call to start a batch of multiple __xen_mc_entry()s.  Must be
22   paired with xen_mc_issue() */
23static inline void xen_mc_batch(void)
24{
25	unsigned long flags;
26
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);
31}
32
33static inline struct multicall_space xen_mc_entry(size_t args)
34{
35	xen_mc_batch();
36	return __xen_mc_entry(args);
37}
38
39/* Flush all pending multicalls */
40void xen_mc_flush(void);
41
42/* Issue a multicall if we're not in a lazy mode */
43static inline void xen_mc_issue(unsigned mode)
44{
45	trace_xen_mc_issue(mode);
46
47	if ((paravirt_get_lazy_mode() & mode) == 0)
48		xen_mc_flush();
49
50	/* restore flags saved in xen_mc_batch */
51	local_irq_restore(this_cpu_read(xen_mc_irq_flags));
52}
53
54/* Set up a callback to be called when the current batch is flushed */
55void xen_mc_callback(void (*fn)(void *), void *data);
56
57/*
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
61 * arg_size bytes.
62 *
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.
66 */
67struct multicall_space xen_mc_extend_args(unsigned long op, size_t arg_size);
68
69#endif /* _XEN_MULTICALLS_H */

 
 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 */