#ifndef _XEN_MULTICALLS_H
  #define _XEN_MULTICALLS_H
  
  #include <trace/events/xen.h>
  
  #include "xen-ops.h"
  
  /* Multicalls */
  struct multicall_space
  {
  	struct multicall_entry *mc;
  	void *args;
  };
  
  /* Allocate room for a multicall and its args */
  struct multicall_space __xen_mc_entry(size_t args);
  
  DECLARE_PER_CPU(unsigned long, xen_mc_irq_flags);
  
  /* Call to start a batch of multiple __xen_mc_entry()s.  Must be
     paired with xen_mc_issue() */
  static inline void xen_mc_batch(void)
  {
  	unsigned long flags;
  
  	/* need to disable interrupts until this entry is complete */
  	local_irq_save(flags);
  	trace_xen_mc_batch(paravirt_get_lazy_mode());
  	__this_cpu_write(xen_mc_irq_flags, flags);
  }
  
  static inline struct multicall_space xen_mc_entry(size_t args)
  {
  	xen_mc_batch();
  	return __xen_mc_entry(args);
  }
  
  /* Flush all pending multicalls */
  void xen_mc_flush(void);
  
  /* Issue a multicall if we're not in a lazy mode */
  static inline void xen_mc_issue(unsigned mode)
  {
  	trace_xen_mc_issue(mode);
  
  	if ((paravirt_get_lazy_mode() & mode) == 0)
  		xen_mc_flush();
  
  	/* restore flags saved in xen_mc_batch */
  	local_irq_restore(this_cpu_read(xen_mc_irq_flags));
  }
  
  /* Set up a callback to be called when the current batch is flushed */
  void xen_mc_callback(void (*fn)(void *), void *data);
  
  /*
   * Try to extend the arguments of the previous multicall command.  The
   * previous command's op must match.  If it does, then it attempts to
   * extend the argument space allocated to the multicall entry by
   * arg_size bytes.
   *
   * The returned multicall_space will return with mc pointing to the
   * command on success, or NULL on failure, and args pointing to the
   * newly allocated space.
   */
  struct multicall_space xen_mc_extend_args(unsigned long op, size_t arg_size);
  
  #endif /* _XEN_MULTICALLS_H */