1 #ifndef _XEN_MULTICALLS_H 2 #define _XEN_MULTICALLS_H 3 4 #include "xen-ops.h" 5 6 /* Multicalls */ 7 struct multicall_space 8 { 9 struct multicall_entry *mc; 10 void *args; 11 }; 12 13 /* Allocate room for a multicall and its args */ 14 struct multicall_space __xen_mc_entry(size_t args); 15 16 DECLARE_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() */ 20 static inline void xen_mc_batch(void) 21 { 22 /* need to disable interrupts until this entry is complete */ 23 local_irq_save(__get_cpu_var(xen_mc_irq_flags)); 24 } 25 26 static inline struct multicall_space xen_mc_entry(size_t args) 27 { 28 xen_mc_batch(); 29 return __xen_mc_entry(args); 30 } 31 32 /* Flush all pending multicalls */ 33 void xen_mc_flush(void); 34 35 /* Issue a multicall if we're not in a lazy mode */ 36 static inline void xen_mc_issue(unsigned mode) 37 { 38 if ((paravirt_get_lazy_mode() & mode) == 0) 39 xen_mc_flush(); 40 41 /* restore flags saved in xen_mc_batch */ 42 local_irq_restore(x86_read_percpu(xen_mc_irq_flags)); 43 } 44 45 /* Set up a callback to be called when the current batch is flushed */ 46 void xen_mc_callback(void (*fn)(void *), void *data); 47 48 /* 49 * Try to extend the arguments of the previous multicall command. The 50 * previous command's op must match. If it does, then it attempts to 51 * extend the argument space allocated to the multicall entry by 52 * arg_size bytes. 53 * 54 * The returned multicall_space will return with mc pointing to the 55 * command on success, or NULL on failure, and args pointing to the 56 * newly allocated space. 57 */ 58 struct multicall_space xen_mc_extend_args(unsigned long op, size_t arg_size); 59 60 #endif /* _XEN_MULTICALLS_H */ 61