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5ead97c8 JF |
1 | #ifndef _XEN_MULTICALLS_H |
2 | #define _XEN_MULTICALLS_H | |
3 | ||
84cdee76 JF |
4 | #include <trace/events/xen.h> |
5 | ||
5ead97c8 JF |
6 | #include "xen-ops.h" |
7 | ||
8 | /* Multicalls */ | |
9 | struct multicall_space | |
10 | { | |
11 | struct multicall_entry *mc; | |
12 | void *args; | |
13 | }; | |
14 | ||
15 | /* Allocate room for a multicall and its args */ | |
16 | struct multicall_space __xen_mc_entry(size_t args); | |
17 | ||
18 | DECLARE_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() */ | |
22 | static inline void xen_mc_batch(void) | |
23 | { | |
06fc732c | 24 | unsigned long flags; |
84cdee76 | 25 | |
5ead97c8 | 26 | /* need to disable interrupts until this entry is complete */ |
06fc732c | 27 | local_irq_save(flags); |
c796f213 | 28 | trace_xen_mc_batch(paravirt_get_lazy_mode()); |
780f36d8 | 29 | __this_cpu_write(xen_mc_irq_flags, flags); |
5ead97c8 JF |
30 | } |
31 | ||
32 | static 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 */ | |
39 | void xen_mc_flush(void); | |
40 | ||
41 | /* Issue a multicall if we're not in a lazy mode */ | |
42 | static inline void xen_mc_issue(unsigned mode) | |
43 | { | |
c796f213 JF |
44 | trace_xen_mc_issue(mode); |
45 | ||
8965c1c0 | 46 | if ((paravirt_get_lazy_mode() & mode) == 0) |
5ead97c8 JF |
47 | xen_mc_flush(); |
48 | ||
49 | /* restore flags saved in xen_mc_batch */ | |
2113f469 | 50 | local_irq_restore(this_cpu_read(xen_mc_irq_flags)); |
5ead97c8 JF |
51 | } |
52 | ||
91e0c5f3 JF |
53 | /* Set up a callback to be called when the current batch is flushed */ |
54 | void xen_mc_callback(void (*fn)(void *), void *data); | |
55 | ||
400d3494 JF |
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 | */ | |
66 | struct multicall_space xen_mc_extend_args(unsigned long op, size_t arg_size); | |
67 | ||
5ead97c8 | 68 | #endif /* _XEN_MULTICALLS_H */ |