120 lines
2.3 KiB
C
120 lines
2.3 KiB
C
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/*
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* Copyright (C) 2016 Red Hat, Inc.
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* Author: Michael S. Tsirkin <mst@redhat.com>
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* This work is licensed under the terms of the GNU GPL, version 2.
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*
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* Common macros and functions for ring benchmarking.
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*/
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#ifndef MAIN_H
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#define MAIN_H
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#include <stdbool.h>
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extern bool do_exit;
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#if defined(__x86_64__) || defined(__i386__)
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#include "x86intrin.h"
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static inline void wait_cycles(unsigned long long cycles)
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{
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unsigned long long t;
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t = __rdtsc();
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while (__rdtsc() - t < cycles) {}
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}
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#define VMEXIT_CYCLES 500
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#define VMENTRY_CYCLES 500
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#else
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static inline void wait_cycles(unsigned long long cycles)
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{
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_Exit(5);
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}
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#define VMEXIT_CYCLES 0
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#define VMENTRY_CYCLES 0
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#endif
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static inline void vmexit(void)
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{
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if (!do_exit)
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return;
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wait_cycles(VMEXIT_CYCLES);
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}
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static inline void vmentry(void)
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{
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if (!do_exit)
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return;
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wait_cycles(VMENTRY_CYCLES);
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}
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/* implemented by ring */
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void alloc_ring(void);
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/* guest side */
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int add_inbuf(unsigned, void *, void *);
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void *get_buf(unsigned *, void **);
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void disable_call();
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bool enable_call();
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void kick_available();
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void poll_used();
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/* host side */
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void disable_kick();
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bool enable_kick();
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bool use_buf(unsigned *, void **);
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void call_used();
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void poll_avail();
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/* implemented by main */
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extern bool do_sleep;
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void kick(void);
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void wait_for_kick(void);
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void call(void);
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void wait_for_call(void);
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extern unsigned ring_size;
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/* Compiler barrier - similar to what Linux uses */
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#define barrier() asm volatile("" ::: "memory")
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/* Is there a portable way to do this? */
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#if defined(__x86_64__) || defined(__i386__)
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#define cpu_relax() asm ("rep; nop" ::: "memory")
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#else
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#define cpu_relax() assert(0)
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#endif
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extern bool do_relax;
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static inline void busy_wait(void)
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{
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if (do_relax)
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cpu_relax();
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else
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/* prevent compiler from removing busy loops */
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barrier();
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}
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/*
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* Not using __ATOMIC_SEQ_CST since gcc docs say they are only synchronized
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* with other __ATOMIC_SEQ_CST calls.
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*/
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#define smp_mb() __sync_synchronize()
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/*
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* This abuses the atomic builtins for thread fences, and
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* adds a compiler barrier.
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*/
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#define smp_release() do { \
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barrier(); \
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__atomic_thread_fence(__ATOMIC_RELEASE); \
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} while (0)
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#define smp_acquire() do { \
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__atomic_thread_fence(__ATOMIC_ACQUIRE); \
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barrier(); \
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} while (0)
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#endif
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