1#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{ 22 unsigned long flags; 23 /* need to disable interrupts until this entry is complete */ 24 local_irq_save(flags); 25 __get_cpu_var(xen_mc_irq_flags) = flags; 26} 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{ 40 if ((paravirt_get_lazy_mode() & mode) == 0) 41 xen_mc_flush(); 42 43 /* restore flags saved in xen_mc_batch */ 44 local_irq_restore(percpu_read(xen_mc_irq_flags)); 45} 46 47/* Set up a callback to be called when the current batch is flushed */ 48void xen_mc_callback(void (*fn)(void *), void *data); 49 50/* 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 62#endif /* _XEN_MULTICALLS_H */ 63