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multicalls.h

#ifndef _XEN_MULTICALLS_H
#define _XEN_MULTICALLS_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)
{
      /* need to disable interrupts until this entry is complete */
      local_irq_save(__get_cpu_var(xen_mc_irq_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)
{
      if ((paravirt_get_lazy_mode() & mode) == 0)
            xen_mc_flush();

      /* restore flags saved in xen_mc_batch */
      local_irq_restore(x86_read_percpu(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);

#endif /* _XEN_MULTICALLS_H */

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