From: Mathieu Desnoyers Date: Mon, 11 May 2009 02:15:08 +0000 (-0400) Subject: LGPL relicensing part 2 X-Git-Tag: v0.1~243 X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=af02d47e5d0712e5ccde6d8f1ee89f18de798cad;p=urcu.git LGPL relicensing part 2 Rewrote the non-trivial functions in arch_ppc.h and arch_x86.h. Added complete header license declarations. Created LICENSE file to explain the library licence. Signed-off-by: Mathieu Desnoyers --- diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..f2b5228 --- /dev/null +++ b/LICENSE @@ -0,0 +1,32 @@ +Userspace RCU library licensing +Mathieu Desnoyers +May 10, 2009 + +The library part is distributed under LGPLv2.1 or later. See lgpl-2.1.txt for +details. This applies to : + +urcu.h +urcu.c +urcu-static.h +arch_x86.h +arch_ppc.h + +LGPL-compatible source code can statically use the library header using : + +#define _LGPL_SOURCE +#include + +Dynamic-only linking with the LGPL library is used if _LGPL_SOURCE is not +defined. It permits relinking with newer versions of the library, which is +required by the LGPL license. + +Library test code is distributed under the GPLv2 license. See gpl-2.0.txt for +details. This applies to : + +urcutorture.h +urcutorture.c +api_x86.h +api_ppc.h +test_urcu.c +test_urcu_yield.c +test_rwlock_timing.c diff --git a/Makefile b/Makefile index 5842b26..093bf66 100644 --- a/Makefile +++ b/Makefile @@ -67,4 +67,5 @@ install: liburcu.so clean: rm -f *.o test_urcu test_urcu_timing test_rwlock_timing urcu-asm.S \ - test_urcu_yield urcutorture urcutorture-yield + test_urcu_yield urcutorture urcutorture-yield liburcu.so \ + test_urcu_dynamic_link diff --git a/arch_ppc.h b/arch_ppc.h index b43d08b..1a34024 100644 --- a/arch_ppc.h +++ b/arch_ppc.h @@ -2,23 +2,24 @@ #define _ARCH_PPC_H /* - * arch_x86.h: Definitions for the x86 architecture, derived from Linux. + * arch_ppc.h: trivial definitions for the powerpc architecture. * - * 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; but only version 2 of the License given - * that this comes from the Linux kernel. + * Copyright (c) 2009 Paul E. McKenney, IBM Corporation. + * Copyright (c) 2009 Mathieu Desnoyers * - * This program is distributed in the hope that it will be useful, + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. +* + * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. * - * Copyright (c) 2009 Paul E. McKenney, IBM Corporation. + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include @@ -26,6 +27,10 @@ #define CONFIG_HAVE_FENCE 1 #define CONFIG_HAVE_MEM_COHERENCY +#ifndef BITS_PER_LONG +#define BITS_PER_LONG (sizeof(unsigned long) * 8) +#endif + #define mb() asm volatile("sync":::"memory") #define rmb() asm volatile("sync":::"memory") #define wmb() asm volatile("sync"::: "memory") @@ -76,25 +81,6 @@ static inline void cpu_relax(void) #define LWSYNC_ON_SMP "\n\tlwsync\n" #define ISYNC_ON_SMP "\n\tisync\n" -#ifndef _INCLUDE_API_H - -static __inline__ void atomic_inc(int *v) -{ - int t; - - __asm__ __volatile__( -"1: lwarx %0,0,%2 # atomic_inc\n\ - addic %0,%0,1\n" - PPC405_ERR77(0,%2) -" stwcx. %0,0,%2 \n\ - bne- 1b" - : "=&r" (t), "+m" (v) - : "r" (&v) - : "cc", "xer"); -} - -#endif /* #ifndef _INCLUDE_API_H */ - struct __xchg_dummy { unsigned long a[100]; }; @@ -103,78 +89,99 @@ struct __xchg_dummy { #ifndef _INCLUDE_API_H /* - * Atomic exchange - * - * Changes the memory location '*ptr' to be val and returns - * the previous value stored there. + * Exchange the 32-bits value pointed to by p, returns the old value. + * Might not work with PPC405 (see err 77). */ -static __always_inline unsigned long -__xchg_u32(volatile void *p, unsigned long val) +static __always_inline +unsigned int __xchg_u32(volatile void *p, unsigned int val) { - unsigned long prev; - - __asm__ __volatile__( - LWSYNC_ON_SMP -"1: lwarx %0,0,%2 \n" - PPC405_ERR77(0,%2) -" stwcx. %3,0,%2 \n\ - bne- 1b" - ISYNC_ON_SMP - : "=&r" (prev), "+m" (*(volatile unsigned int *)p) - : "r" (p), "r" (val) - : "cc", "memory"); - + unsigned int prev; + + __asm__ __volatile__(LWSYNC_ON_SMP + "1:\t" "lwarx %0,0,%2\n" + "stwcx. %3,0,%2\n" + "bne- 1b" + ISYNC_ON_SMP + : "=&r" (prev), "+m" (*(volatile unsigned int *)p) + : "r" (p), "r" (val) + : "cc", "memory"); return prev; } +#if (BITS_PER_LONG == 64) /* - * This function doesn't exist, so you'll get a linker error - * if something tries to do an invalid xchg(). + * Exchange the 64-bits value pointed to by p, returns the old value. + * Might not work with PPC405 (see err 77). */ -extern void __xchg_called_with_bad_pointer(void); +static __always_inline +unsigned long __xchg_u64(volatile void *p, unsigned long val) +{ + unsigned long prev; + + __asm__ __volatile__(LWSYNC_ON_SMP + "1:\t" "ldarx %0,0,%2\n" + "stdcx. %3,0,%2\n" + "bne- 1b" + ISYNC_ON_SMP + : "=&r" (prev), "+m" (*(volatile unsigned long *)p) + : "r" (p), "r" (val) + : "cc", "memory"); + return prev; +} +#endif -static __always_inline unsigned long -__xchg(volatile void *ptr, unsigned long x, unsigned int size) +static __always_inline +unsigned long __xchg(volatile void *ptr, unsigned long x, int size) { switch (size) { case 4: return __xchg_u32(ptr, x); -#ifdef CONFIG_PPC64 +#if (BITS_PER_LONG == 64) case 8: return __xchg_u64(ptr, x); #endif } - __xchg_called_with_bad_pointer(); return x; } -#define xchg(ptr,x) \ - ({ \ - __typeof__(*(ptr)) _x_ = (x); \ - (__typeof__(*(ptr))) __xchg((ptr), (unsigned long)_x_, sizeof(*(ptr))); \ - }) +/* + * note : xchg should only be used with pointers to 32 or 64-bits elements. + * No build-time check is done on the element size because depending on + * non-referenced unexisting symbol at link time to provide an error message + * only work when compiling with optimizations. + */ +#define xchg(ptr, v) \ + ((__typeof__(*(ptr)))__xchg((ptr), (unsigned long)(v), sizeof(*(ptr)))) #endif /* #ifndef _INCLUDE_API_H */ -#define mftbl() ({unsigned long rval; \ - asm volatile("mftbl %0" : "=r" (rval)); rval;}) -#define mftbu() ({unsigned long rval; \ - asm volatile("mftbu %0" : "=r" (rval)); rval;}) +#define mftbl() \ + ({ \ + unsigned long rval; \ + asm volatile("mftbl %0" : "=r" (rval)); \ + rval; \ + }) + +#define mftbu() \ + ({ \ + unsigned long rval; \ + asm volatile("mftbu %0" : "=r" (rval)); \ + rval; \ + }) typedef unsigned long long cycles_t; static inline cycles_t get_cycles (void) { - long h; - long l; + long h, l; for (;;) { h = mftbu(); - smp_mb(); + barrier(); l = mftbl(); - smp_mb(); + barrier(); if (mftbu() == h) - return (((long long)h) << 32) + l; + return (((cycles_t) h) << 32) + l; } } diff --git a/arch_x86.h b/arch_x86.h index e924913..01b5d50 100644 --- a/arch_x86.h +++ b/arch_x86.h @@ -2,23 +2,24 @@ #define _ARCH_X86_H /* - * arch_x86.h: Definitions for the x86 architecture, derived from Linux. + * arch_x86.h: trivial definitions for the x86 architecture. * - * 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; but only version 2 of the License given - * that this comes from the Linux kernel. + * Copyright (c) 2009 Paul E. McKenney, IBM Corporation. + * Copyright (c) 2009 Mathieu Desnoyers * - * This program is distributed in the hope that it will be useful, + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. +* + * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. * - * Copyright (c) 2009 Paul E. McKenney, IBM Corporation. + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include @@ -27,6 +28,10 @@ #define CONFIG_HAVE_FENCE 1 #define CONFIG_HAVE_MEM_COHERENCY +#ifndef BITS_PER_LONG +#define BITS_PER_LONG (sizeof(unsigned long) * 8) +#endif + #ifdef CONFIG_HAVE_FENCE #define mb() asm volatile("mfence":::"memory") #define rmb() asm volatile("lfence":::"memory") @@ -89,75 +94,69 @@ static inline void cpu_relax(void) rep_nop(); } -#ifndef _INCLUDE_API_H +#define xchg(ptr, v) \ + ((__typeof__(*(ptr)))__xchg((ptr), (unsigned long)(v), sizeof(*(ptr)))) -static inline void atomic_inc(int *v) -{ - asm volatile("lock; incl %0" - : "+m" (*v)); -} - -#endif /* #ifndef _INCLUDE_API_H */ - -#define xchg(ptr, v) \ - ((__typeof__(*(ptr)))__xchg((unsigned long)(v), (ptr), sizeof(*(ptr)))) - -struct __xchg_dummy { +struct __xchg_ptr_as_array { unsigned long a[100]; }; -#define __xg(x) ((struct __xchg_dummy *)(x)) + +#define __xchg_ptr_as_array(x) ((struct __xchg_ptr_as_array *)(x)) /* - * Note: no "lock" prefix even on SMP: xchg always implies lock anyway - * Note 2: xchg has side effect, so that attribute volatile is necessary, - * but generally the primitive is invalid, *ptr is output argument. --ANK + * xchg always implies a "lock" prefix, even on UP. See Intel documentation. + * volatile attribute is neccessary due to xchg side effect. + * *ptr is an output argument. * x is considered local, ptr is considered remote. */ -static inline unsigned long __xchg(unsigned long x, volatile void *ptr, +static inline unsigned long __xchg(volatile void *ptr, unsigned long x, int size) { switch (size) { case 1: asm volatile("xchgb %b0,%1" : "=q" (x) - : "m" (*__xg(ptr)), "0" (x) + : "m" (*__xchg_ptr_as_array(ptr)), "0" (x) : "memory"); break; case 2: asm volatile("xchgw %w0,%1" : "=r" (x) - : "m" (*__xg(ptr)), "0" (x) + : "m" (*__xchg_ptr_as_array(ptr)), "0" (x) : "memory"); break; case 4: asm volatile("xchgl %k0,%1" : "=r" (x) - : "m" (*__xg(ptr)), "0" (x) + : "m" (*__xchg_ptr_as_array(ptr)), "0" (x) : "memory"); break; +#if (BITS_PER_LONG == 64) case 8: asm volatile("xchgq %0,%1" : "=r" (x) - : "m" (*__xg(ptr)), "0" (x) + : "m" (*__xchg_ptr_as_array(ptr)), "0" (x) : "memory"); break; +#endif } smp_wmc(); return x; } - -#define rdtscll(val) do { \ - unsigned int __a,__d; \ - asm volatile("rdtsc" : "=a" (__a), "=d" (__d)); \ - (val) = ((unsigned long long)__a) | (((unsigned long long)__d)<<32); \ -} while(0) +#define rdtscll(val) \ + do { \ + unsigned int __a, __d; \ + asm volatile("rdtsc" : "=a" (__a), "=d" (__d)); \ + (val) = ((unsigned long long)__a) \ + | (((unsigned long long)__d) << 32); \ + } while(0) typedef unsigned long long cycles_t; -static inline cycles_t get_cycles (void) +static inline cycles_t get_cycles(void) { - unsigned long long ret = 0; + cycles_t ret = 0; rdtscll(ret); return ret; diff --git a/compiler.h b/compiler.h new file mode 100644 index 0000000..2507ec8 --- /dev/null +++ b/compiler.h @@ -0,0 +1,48 @@ +#ifndef _COMPILER_H +#define _COMPILER_H + +/* + * compiler.h + * + * Compiler definitions. + * + * Copyright (c) 2009 Mathieu Desnoyers + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. +* + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + * + * IBM's contributions to this file may be relicensed under LGPLv2 or later. + */ + +/* The "volatile" is due to gcc bugs */ +#define barrier() __asm__ __volatile__("": : :"memory") + +#define likely(x) __builtin_expect(!!(x), 1) +#define unlikely(x) __builtin_expect(!!(x), 0) + +/* + * Instruct the compiler to perform only a single access to a variable + * (prohibits merging and refetching). The compiler is also forbidden to reorder + * successive instances of ACCESS_ONCE(), but only when the compiler is aware of + * particular ordering. Compiler ordering can be ensured, for example, by + * putting two ACCESS_ONCE() in separate C statements. + * + * This macro does absolutely -nothing- to prevent the CPU from reordering, + * merging, or refetching absolutely anything at any time. Its main intended + * use is to mediate communication between process-level code and irq/NMI + * handlers, all running on the same CPU. + */ +#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x)) + +#endif /* _COMPILER_H */ diff --git a/gpl-2.0.txt b/gpl-2.0.txt new file mode 100644 index 0000000..d511905 --- /dev/null +++ b/gpl-2.0.txt @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. By contrast, the GNU General Public +License is intended to guarantee your freedom to share and change free +software--to make sure the software is free for all its users. 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See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + +Also add information on how to contact you by electronic and paper mail. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the library, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the + library `Frob' (a library for tweaking knobs) written by James Random Hacker. + + , 1 April 1990 + Ty Coon, President of Vice + +That's all there is to it! + + diff --git a/test_rwlock_timing.c b/test_rwlock_timing.c index 2c3d894..2c45658 100644 --- a/test_rwlock_timing.c +++ b/test_rwlock_timing.c @@ -5,7 +5,19 @@ * * Copyright February 2009 - Mathieu Desnoyers * - * Distributed under GPLv2 + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include diff --git a/test_urcu.c b/test_urcu.c index a044d53..72cceeb 100644 --- a/test_urcu.c +++ b/test_urcu.c @@ -5,7 +5,19 @@ * * Copyright February 2009 - Mathieu Desnoyers * - * Distributed under GPLv2 + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include diff --git a/test_urcu_timing.c b/test_urcu_timing.c index a11532a..cf70709 100644 --- a/test_urcu_timing.c +++ b/test_urcu_timing.c @@ -5,7 +5,19 @@ * * Copyright February 2009 - Mathieu Desnoyers * - * Distributed under GPLv2 + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include diff --git a/urcu.c b/urcu.c index 7ab87c4..8fd6195 100644 --- a/urcu.c +++ b/urcu.c @@ -3,9 +3,22 @@ * * Userspace RCU library * - * Copyright February 2009 - Mathieu Desnoyers + * Copyright (c) 2009 Mathieu Desnoyers + * Copyright (c) 2009 Paul E. McKenney, IBM Corporation. * - * Distributed under LGPLv2.1 + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * IBM's contributions to this file may be relicensed under LGPLv2 or later. */ diff --git a/urcu.h b/urcu.h index 0b0d232..b46033f 100644 --- a/urcu.h +++ b/urcu.h @@ -6,17 +6,27 @@ * * Userspace RCU header * - * Copyright February 2009 - Mathieu Desnoyers - * - * Credits for Paul E. McKenney - * for inspiration coming from the Linux kernel RCU and rcu-preempt. + * Copyright (c) 2009 Mathieu Desnoyers + * Copyright (c) 2009 Paul E. McKenney, IBM Corporation. * * LGPL-compatible code should include this header with : * * #define _LGPL_SOURCE * #include * - * Distributed under LGPLv2.1 + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * IBM's contributions to this file may be relicensed under LGPLv2 or later. */