projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 */ |