linux/arch/x86/xen/multicalls.h
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   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        /* need to disable interrupts until this entry is complete */
  23        local_irq_save(__get_cpu_var(xen_mc_irq_flags));
  24}
  25
  26static 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 */
  33void xen_mc_flush(void);
  34
  35/* Issue a multicall if we're not in a lazy mode */
  36static 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 */
  46void 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 */
  58struct multicall_space xen_mc_extend_args(unsigned long op, size_t arg_size);
  59
  60#endif /* _XEN_MULTICALLS_H */
  61