/*
   * Testsuite for atomic64_t functions
   *
   * Copyright © 2010  Luca Barbieri
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   */

  
  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

  #include <linux/init.h>

  #include <linux/bug.h>

  #include <linux/kernel.h>

  #include <linux/atomic.h>

  #ifdef CONFIG_X86

  #include <asm/cpufeature.h>	/* for boot_cpu_has below */

  #endif

  #define TEST(bit, op, c_op, val)				\
  do {								\
  	atomic##bit##_set(&v, v0);				\
  	r = v0;							\
  	atomic##bit##_##op(val, &v);				\
  	r c_op val;						\
  	WARN(atomic##bit##_read(&v) != r, "%Lx != %Lx
  ",	\
  		(unsigned long long)atomic##bit##_read(&v),	\
  		(unsigned long long)r);				\
  } while (0)

  /*
   * Test for a atomic operation family,
   * @test should be a macro accepting parameters (bit, op, ...)
   */
  
  #define FAMILY_TEST(test, bit, op, args...)	\
  do {						\
  	test(bit, op, ##args);		\
  	test(bit, op##_acquire, ##args);	\
  	test(bit, op##_release, ##args);	\
  	test(bit, op##_relaxed, ##args);	\
  } while (0)
  
  #define TEST_RETURN(bit, op, c_op, val)				\
  do {								\
  	atomic##bit##_set(&v, v0);				\
  	r = v0;							\
  	r c_op val;						\
  	BUG_ON(atomic##bit##_##op(val, &v) != r);		\
  	BUG_ON(atomic##bit##_read(&v) != r);			\
  } while (0)
  
  #define RETURN_FAMILY_TEST(bit, op, c_op, val)			\
  do {								\
  	FAMILY_TEST(TEST_RETURN, bit, op, c_op, val);		\
  } while (0)
  
  #define TEST_ARGS(bit, op, init, ret, expect, args...)		\
  do {								\
  	atomic##bit##_set(&v, init);				\
  	BUG_ON(atomic##bit##_##op(&v, ##args) != ret);		\
  	BUG_ON(atomic##bit##_read(&v) != expect);		\
  } while (0)
  
  #define XCHG_FAMILY_TEST(bit, init, new)				\
  do {									\
  	FAMILY_TEST(TEST_ARGS, bit, xchg, init, init, new, new);	\
  } while (0)
  
  #define CMPXCHG_FAMILY_TEST(bit, init, new, wrong)			\
  do {									\
  	FAMILY_TEST(TEST_ARGS, bit, cmpxchg, 				\
  			init, init, new, init, new);			\
  	FAMILY_TEST(TEST_ARGS, bit, cmpxchg,				\
  			init, init, init, wrong, new);			\
  } while (0)
  
  #define INC_RETURN_FAMILY_TEST(bit, i)			\
  do {							\
  	FAMILY_TEST(TEST_ARGS, bit, inc_return,		\
  			i, (i) + one, (i) + one);	\
  } while (0)
  
  #define DEC_RETURN_FAMILY_TEST(bit, i)			\
  do {							\
  	FAMILY_TEST(TEST_ARGS, bit, dec_return,		\
  			i, (i) - one, (i) - one);	\
  } while (0)

  static __init void test_atomic(void)
  {
  	int v0 = 0xaaa31337;
  	int v1 = 0xdeadbeef;
  	int onestwos = 0x11112222;
  	int one = 1;
  
  	atomic_t v;
  	int r;
  
  	TEST(, add, +=, onestwos);
  	TEST(, add, +=, -one);
  	TEST(, sub, -=, onestwos);
  	TEST(, sub, -=, -one);
  	TEST(, or, |=, v1);
  	TEST(, and, &=, v1);
  	TEST(, xor, ^=, v1);
  	TEST(, andnot, &= ~, v1);

  
  	RETURN_FAMILY_TEST(, add_return, +=, onestwos);
  	RETURN_FAMILY_TEST(, add_return, +=, -one);
  	RETURN_FAMILY_TEST(, sub_return, -=, onestwos);
  	RETURN_FAMILY_TEST(, sub_return, -=, -one);
  
  	INC_RETURN_FAMILY_TEST(, v0);
  	DEC_RETURN_FAMILY_TEST(, v0);
  
  	XCHG_FAMILY_TEST(, v0, v1);
  	CMPXCHG_FAMILY_TEST(, v0, v1, onestwos);

  }

  #define INIT(c) do { atomic64_set(&v, c); r = c; } while (0)

  static __init void test_atomic64(void)

  {
  	long long v0 = 0xaaa31337c001d00dLL;
  	long long v1 = 0xdeadbeefdeafcafeLL;
  	long long v2 = 0xfaceabadf00df001LL;
  	long long onestwos = 0x1111111122222222LL;
  	long long one = 1LL;
  
  	atomic64_t v = ATOMIC64_INIT(v0);
  	long long r = v0;
  	BUG_ON(v.counter != r);
  
  	atomic64_set(&v, v1);
  	r = v1;
  	BUG_ON(v.counter != r);
  	BUG_ON(atomic64_read(&v) != r);

  	TEST(64, add, +=, onestwos);
  	TEST(64, add, +=, -one);
  	TEST(64, sub, -=, onestwos);
  	TEST(64, sub, -=, -one);
  	TEST(64, or, |=, v1);
  	TEST(64, and, &=, v1);
  	TEST(64, xor, ^=, v1);
  	TEST(64, andnot, &= ~, v1);

  	RETURN_FAMILY_TEST(64, add_return, +=, onestwos);
  	RETURN_FAMILY_TEST(64, add_return, +=, -one);
  	RETURN_FAMILY_TEST(64, sub_return, -=, onestwos);
  	RETURN_FAMILY_TEST(64, sub_return, -=, -one);

  
  	INIT(v0);
  	atomic64_inc(&v);
  	r += one;
  	BUG_ON(v.counter != r);
  
  	INIT(v0);

  	atomic64_dec(&v);
  	r -= one;
  	BUG_ON(v.counter != r);

  	INC_RETURN_FAMILY_TEST(64, v0);
  	DEC_RETURN_FAMILY_TEST(64, v0);

  	XCHG_FAMILY_TEST(64, v0, v1);
  	CMPXCHG_FAMILY_TEST(64, v0, v1, v2);

  
  	INIT(v0);

  	BUG_ON(atomic64_add_unless(&v, one, v0));

  	BUG_ON(v.counter != r);
  
  	INIT(v0);

  	BUG_ON(!atomic64_add_unless(&v, one, v1));

  	r += one;
  	BUG_ON(v.counter != r);

  #ifdef CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE

  	INIT(onestwos);
  	BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
  	r -= one;
  	BUG_ON(v.counter != r);
  
  	INIT(0);
  	BUG_ON(atomic64_dec_if_positive(&v) != -one);
  	BUG_ON(v.counter != r);
  
  	INIT(-one);
  	BUG_ON(atomic64_dec_if_positive(&v) != (-one - one));
  	BUG_ON(v.counter != r);

  #else

  #warning Please implement atomic64_dec_if_positive for your architecture and select the above Kconfig symbol

  #endif

  
  	INIT(onestwos);

  	BUG_ON(!atomic64_inc_not_zero(&v));

  	r += one;
  	BUG_ON(v.counter != r);
  
  	INIT(0);

  	BUG_ON(atomic64_inc_not_zero(&v));

  	BUG_ON(v.counter != r);
  
  	INIT(-one);

  	BUG_ON(!atomic64_inc_not_zero(&v));

  	r += one;
  	BUG_ON(v.counter != r);

  }
  
  static __init int test_atomics(void)
  {
  	test_atomic();
  	test_atomic64();

  
  #ifdef CONFIG_X86

  	pr_info("passed for %s platform %s CX8 and %s SSE
  ",

  #ifdef CONFIG_X86_64

  		"x86-64",

  #elif defined(CONFIG_X86_CMPXCHG64)

  		"i586+",

  #else

  		"i386+",

  #endif

  	       boot_cpu_has(X86_FEATURE_CX8) ? "with" : "without",
  	       boot_cpu_has(X86_FEATURE_XMM) ? "with" : "without");

  #else

  	pr_info("passed
  ");

  #endif
  
  	return 0;
  }

  core_initcall(test_atomics);