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From 1cdbe579482c07e9f4bb3baa4864da2d3e7eb837 Mon Sep 17 00:00:00 2001
From: Andi Kleen <ak@linux.intel.com>
Date: Sat, 10 Nov 2012 00:51:26 -0800i
Subject: [PATCH 6/9] build extra lipthreadcond so
add elsion functions which moved to libc in glibc-2.34.
Some attributes are changed and cannot be directly referenced.
---
nptl_2_17/lll_timedlock_wait_2_17.c | 59 +++++++++++++++++++++++++++++
nptl_2_17/elision-conf_2_17.c | 138 +++++++++++++++++++++++++++++++
nptl_2_17/elision-lock_2_17.c | 107 ++++++++++++++++++++++++
nptl_2_17/elision-timed_2_17.c | 27 ++++++
nptl_2_17/elision-trylock_2_17.c | 75 +++++++++++++++++
nptl_2_17/elision-unlock_2_17.c | 34 ++++++++
nptl_2_17/hle_2_17.h | 75 +++++++++++++++++
6 files changed, 515
insertions(+)
create mode 100644 nptl_2_17/lll_timedlock_wait_2_17.c
create mode 100644 nptl_2_17/elision-conf_2_17.c
create mode 100644 nptl_2_17/elision-lock_2_17.c
create mode 100644 nptl_2_17/elision-timed_2_17.c
create mode 100644 nptl_2_17/elision-trylock_2_17.c
create mode 100644 nptl_2_17/elision-unlock_2_17.c
create mode 100644 nptl_2_17/hle_2_17.h
diff --git a/nptl_2_17/lll_timedlock_wait_2_17.c b/nptl_2_17/lll_timedlock_wait_2_17.c
new file mode 100644
index 00000000..91bf9637
--- /dev/null
+++ b/nptl_2_17/lll_timedlock_wait_2_17.c
@@ -0,0 +1,59 @@
+/* Timed low level locking for pthread library. Generic futex-using version.
+ Copyright (C) 2003-2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
+
+ The GNU C 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.
+
+ The GNU C 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 the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <atomic.h>
+#include <errno.h>
+#include <lowlevellock.h>
+#include <sys/time.h>
+
+
+int
+__lll_timedlock_wait (int *futex, const struct timespec *abstime, int private)
+{
+ /* Reject invalid timeouts. */
+ if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)
+ return EINVAL;
+
+ /* Try locking. */
+ while (atomic_exchange_acq (futex, 2) != 0)
+ {
+ struct timeval tv;
+
+ /* Get the current time. */
+ (void) __gettimeofday (&tv, NULL);
+
+ /* Compute relative timeout. */
+ struct timespec rt;
+ rt.tv_sec = abstime->tv_sec - tv.tv_sec;
+ rt.tv_nsec = abstime->tv_nsec - tv.tv_usec * 1000;
+ if (rt.tv_nsec < 0)
+ {
+ rt.tv_nsec += 1000000000;
+ --rt.tv_sec;
+ }
+
+ if (rt.tv_sec < 0)
+ return ETIMEDOUT;
+
+ /* If *futex == 2, wait until woken or timeout. */
+ lll_futex_timed_wait (futex, 2, &rt, private);
+ }
+
+ return 0;
+}
diff --git a/nptl_2_17/elision-conf_2_17.c b/nptl_2_17/elision-conf_2_17.c
new file mode 100644
index 00000000..22af2944
--- /dev/null
+++ b/nptl_2_17/elision-conf_2_17.c
@@ -0,0 +1,138 @@
+/* elision-conf.c: Lock elision tunable parameters.
+ Copyright (C) 2013-2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C 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.
+
+ The GNU C 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 the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include "config.h"
+#include <pthreadP.h>
+#include <init-arch.h>
+#include <elision-conf.h>
+#include <unistd.h>
+
+#if HAVE_TUNABLES
+# define TUNABLE_NAMESPACE elision
+#endif
+#include <elf/dl-tunables.h>
+
+/* Reasonable initial tuning values, may be revised in the future.
+ This is a conservative initial value. */
+
+struct elision_config __elision_aconf =
+ {
+ /* How often to not attempt to use elision if a transaction aborted
+ because the lock is already acquired. Expressed in number of lock
+ acquisition attempts. */
+ .skip_lock_busy = 3,
+ /* How often to not attempt to use elision if a transaction aborted due
+ to reasons other than other threads' memory accesses. Expressed in
+ number of lock acquisition attempts. */
+ .skip_lock_internal_abort = 3,
+ /* How often we retry using elision if there is chance for the transaction
+ to finish execution (e.g., it wasn't aborted due to the lock being
+ already acquired. */
+ .retry_try_xbegin = 3,
+ /* Same as SKIP_LOCK_INTERNAL_ABORT but for trylock. */
+ .skip_trylock_internal_abort = 3,
+ };
+
+/* Force elision for all new locks. This is used to decide whether existing
+ DEFAULT locks should be automatically upgraded to elision in
+ pthread_mutex_lock(). Disabled for suid programs. Only used when elision
+ is available. */
+
+int __pthread_force_elision attribute_hidden = 0;
+
+#if HAVE_TUNABLES
+static inline void
+__always_inline
+do_set_elision_enable (int32_t elision_enable)
+{
+ /* Enable elision if it's avaliable in hardware. It's not necessary to check
+ if __libc_enable_secure isn't enabled since elision_enable will be set
+ according to the default, which is disabled. */
+ if (elision_enable == 1)
+ __pthread_force_elision = HAS_CPU_FEATURE (RTM) ? 1 : 0;
+}
+
+/* The pthread->elision_enable tunable is 0 or 1 indicating that elision
+ should be disabled or enabled respectively. The feature will only be used
+ if it's supported by the hardware. */
+
+void
+TUNABLE_CALLBACK (set_elision_enable) (tunable_val_t *valp)
+{
+ int32_t elision_enable = (int32_t) valp->numval;
+ do_set_elision_enable (elision_enable);
+}
+
+#define TUNABLE_CALLBACK_FNDECL(__name, __type) \
+static inline void \
+__always_inline \
+do_set_elision_ ## __name (__type value) \
+{ \
+ __elision_aconf.__name = value; \
+} \
+void \
+TUNABLE_CALLBACK (set_elision_ ## __name) (tunable_val_t *valp) \
+{ \
+ __type value = (__type) (valp)->numval; \
+ do_set_elision_ ## __name (value); \
+}
+
+TUNABLE_CALLBACK_FNDECL (skip_lock_busy, int32_t);
+TUNABLE_CALLBACK_FNDECL (skip_lock_internal_abort, int32_t);
+TUNABLE_CALLBACK_FNDECL (retry_try_xbegin, int32_t);
+TUNABLE_CALLBACK_FNDECL (skip_trylock_internal_abort, int32_t);
+#endif
+
+/* Initialize elision. */
+
+static void
+elision_init (int argc __attribute__ ((unused)),
+ char **argv __attribute__ ((unused)),
+ char **environ)
+{
+#if HAVE_TUNABLES
+ /* Elision depends on tunables and must be explicitly turned on by setting
+ the appropriate tunable on a supported platform. */
+
+ TUNABLE_GET (enable, int32_t,
+ TUNABLE_CALLBACK (set_elision_enable));
+ TUNABLE_GET (skip_lock_busy, int32_t,
+ TUNABLE_CALLBACK (set_elision_skip_lock_busy));
+ TUNABLE_GET (skip_lock_internal_abort, int32_t,
+ TUNABLE_CALLBACK (set_elision_skip_lock_internal_abort));
+ TUNABLE_GET (tries, int32_t,
+ TUNABLE_CALLBACK (set_elision_retry_try_xbegin));
+ TUNABLE_GET (skip_trylock_internal_abort, int32_t,
+ TUNABLE_CALLBACK (set_elision_skip_trylock_internal_abort));
+#endif
+
+ if (!__pthread_force_elision)
+ __elision_aconf.retry_try_xbegin = 0; /* Disable elision on rwlocks. */
+}
+
+#ifdef SHARED
+# define INIT_SECTION ".init_array"
+#else
+# define INIT_SECTION ".preinit_array"
+#endif
+
+void (*const __pthread_init_array []) (int, char **, char **)
+ __attribute__ ((section (INIT_SECTION), aligned (sizeof (void *)))) =
+{
+ &elision_init
+};
diff --git a/nptl_2_17/elision-lock_2_17.c b/nptl_2_17/elision-lock_2_17.c
new file mode 100644
index 00000000..e6dbbc21
--- /dev/null
+++ b/nptl_2_17/elision-lock_2_17.c
@@ -0,0 +1,107 @@
+/* elision-lock.c: Elided pthread mutex lock.
+ Copyright (C) 2011-2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C 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.
+
+ The GNU C 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 the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <pthread_2_17.h>
+#include "pthreadP_2_17.h"
+#include "lowlevellock.h"
+#include "hle_2_17.h"
+#include <elision-conf.h>
+
+#if !defined(LLL_LOCK) && !defined(EXTRAARG)
+/* Make sure the configuration code is always linked in for static
+ libraries. */
+#include "elision-conf_2_17.c"
+#endif
+
+#ifndef EXTRAARG
+#define EXTRAARG
+#endif
+#ifndef LLL_LOCK
+#define LLL_LOCK(a,b) lll_lock(a,b), 0
+#endif
+
+#define aconf __elision_aconf
+
+/* Adaptive lock using transactions.
+ By default the lock region is run as a transaction, and when it
+ aborts or the lock is busy the lock adapts itself. */
+
+int
+__lll_lock_elision (int *futex, short *adapt_count, EXTRAARG int private)
+{
+ /* adapt_count can be accessed concurrently; these accesses can be both
+ inside of transactions (if critical sections are nested and the outer
+ critical section uses lock elision) and outside of transactions. Thus,
+ we need to use atomic accesses to avoid data races. However, the
+ value of adapt_count is just a hint, so relaxed MO accesses are
+ sufficient. */
+ if (atomic_load_relaxed (adapt_count) <= 0)
+ {
+ unsigned status;
+ int try_xbegin;
+
+ for (try_xbegin = aconf.retry_try_xbegin;
+ try_xbegin > 0;
+ try_xbegin--)
+ {
+ if ((status = _xbegin()) == _XBEGIN_STARTED)
+ {
+ if (*futex == 0)
+ return 0;
+
+ /* Lock was busy. Fall back to normal locking.
+ Could also _xend here but xabort with 0xff code
+ is more visible in the profiler. */
+ _xabort (_ABORT_LOCK_BUSY);
+ }
+
+ if (!(status & _XABORT_RETRY))
+ {
+ if ((status & _XABORT_EXPLICIT)
+ && _XABORT_CODE (status) == _ABORT_LOCK_BUSY)
+ {
+ /* Right now we skip here. Better would be to wait a bit
+ and retry. This likely needs some spinning. See
+ above for why relaxed MO is sufficient. */
+ if (atomic_load_relaxed (adapt_count)
+ != aconf.skip_lock_busy)
+ atomic_store_relaxed (adapt_count, aconf.skip_lock_busy);
+ }
+ /* Internal abort. There is no chance for retry.
+ Use the normal locking and next time use lock.
+ Be careful to avoid writing to the lock. See above for why
+ relaxed MO is sufficient. */
+ else if (atomic_load_relaxed (adapt_count)
+ != aconf.skip_lock_internal_abort)
+ atomic_store_relaxed (adapt_count,
+ aconf.skip_lock_internal_abort);
+ break;
+ }
+ }
+ }
+ else
+ {
+ /* Use a normal lock until the threshold counter runs out.
+ Lost updates possible. */
+ atomic_store_relaxed (adapt_count,
+ atomic_load_relaxed (adapt_count) - 1);
+ }
+
+ /* Use a normal lock here. */
+ return LLL_LOCK ((*futex), private);
+}
diff --git a/nptl_2_17/elision-timed_2_17.c b/nptl_2_17/elision-timed_2_17.c
new file mode 100644
index 00000000..5050f2d1
--- /dev/null
+++ b/nptl_2_17/elision-timed_2_17.c
@@ -0,0 +1,27 @@
+/* elision-timed.c: Lock elision timed lock.
+ Copyright (C) 2013-2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C 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.
+
+ The GNU C 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 the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <time.h>
+#include <elision-conf.h>
+#include "lowlevellock.h"
+#include <old_macros_2_17.h>
+#define __lll_lock_elision __lll_timedlock_elision
+#define EXTRAARG const struct timespec *t,
+#undef LLL_LOCK
+#define LLL_LOCK(a, b) lll_timedlock(a, t, b)
+#include "elision-lock_2_17.c"
diff --git a/nptl_2_17/elision-trylock_2_17.c b/nptl_2_17/elision-trylock_2_17.c
new file mode 100644
index 00000000..70d8f8b9
--- /dev/null
+++ b/nptl_2_17/elision-trylock_2_17.c
@@ -0,0 +1,75 @@
+/* elision-trylock.c: Lock eliding trylock for pthreads.
+ Copyright (C) 2013-2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C 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.
+
+ The GNU C 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 the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <pthread_2_17.h>
+
+#include <lowlevellock.h>
+#include "hle_2_17.h"
+#include <elision-conf.h>
+
+#define aconf __elision_aconf
+
+/* Try to elide a futex trylock. FUTEX is the futex variable. ADAPT_COUNT is
+ the adaptation counter in the mutex. */
+
+int
+__lll_trylock_elision (int *futex, short *adapt_count)
+{
+ /* Implement POSIX semantics by forbiding nesting
+ trylock. Sorry. After the abort the code is re-executed
+ non transactional and if the lock was already locked
+ return an error. */
+ _xabort (_ABORT_NESTED_TRYLOCK);
+
+ /* Only try a transaction if it's worth it. See __lll_lock_elision for
+ why we need atomic accesses. Relaxed MO is sufficient because this is
+ just a hint. */
+ if (atomic_load_relaxed (adapt_count) <= 0)
+ {
+ unsigned status;
+
+ if ((status = _xbegin()) == _XBEGIN_STARTED)
+ {
+ if (*futex == 0)
+ return 0;
+
+ /* Lock was busy. Fall back to normal locking.
+ Could also _xend here but xabort with 0xff code
+ is more visible in the profiler. */
+ _xabort (_ABORT_LOCK_BUSY);
+ }
+
+ if (!(status & _XABORT_RETRY))
+ {
+ /* Internal abort. No chance for retry. For future
+ locks don't try speculation for some time. See above for MO. */
+ if (atomic_load_relaxed (adapt_count)
+ != aconf.skip_lock_internal_abort)
+ atomic_store_relaxed (adapt_count, aconf.skip_lock_internal_abort);
+ }
+ /* Could do some retries here. */
+ }
+ else
+ {
+ /* Lost updates are possible but harmless (see above). */
+ atomic_store_relaxed (adapt_count,
+ atomic_load_relaxed (adapt_count) - 1);
+ }
+
+ return lll_trylock (*futex);
+}
diff --git a/nptl_2_17/elision-unlock_2_17.c b/nptl_2_17/elision-unlock_2_17.c
new file mode 100644
index 00000000..b5d38c5f
--- /dev/null
+++ b/nptl_2_17/elision-unlock_2_17.c
@@ -0,0 +1,34 @@
+/* elision-unlock.c: Commit an elided pthread lock.
+ Copyright (C) 2013-2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C 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.
+
+ The GNU C 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 the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include "pthreadP_2_17.h"
+#include "lowlevellock.h"
+#include "hle_2_17.h"
+#include <old_macros_2_17.h>
+
+int
+__lll_unlock_elision(int *lock, int private)
+{
+ /* When the lock was free we're in a transaction.
+ When you crash here you unlocked a free lock. */
+ if (*lock == 0)
+ _xend();
+ else
+ lll_unlock ((*lock), private);
+ return 0;
+}
diff --git a/nptl_2_17/hle_2_17.h b/nptl_2_17/hle_2_17.h
new file mode 100644
index 00000000..4a7b9e3b
--- /dev/null
+++ b/nptl_2_17/hle_2_17.h
@@ -0,0 +1,75 @@
+/* Shared RTM header. Emulate TSX intrinsics for compilers and assemblers
+ that do not support the intrinsics and instructions yet. */
+#ifndef _HLE_H
+#define _HLE_H 1
+
+#ifdef __ASSEMBLER__
+
+.macro XBEGIN target
+ .byte 0xc7,0xf8
+ .long \target-1f
+1:
+.endm
+
+.macro XEND
+ .byte 0x0f,0x01,0xd5
+.endm
+
+.macro XABORT code
+ .byte 0xc6,0xf8,\code
+.endm
+
+.macro XTEST
+ .byte 0x0f,0x01,0xd6
+.endm
+
+#endif
+
+/* Official RTM intrinsics interface matching gcc/icc, but works
+ on older gcc compatible compilers and binutils.
+ We should somehow detect if the compiler supports it, because
+ it may be able to generate slightly better code. */
+
+#define _XBEGIN_STARTED (~0u)
+#define _XABORT_EXPLICIT (1 << 0)
+#define _XABORT_RETRY (1 << 1)
+#define _XABORT_CONFLICT (1 << 2)
+#define _XABORT_CAPACITY (1 << 3)
+#define _XABORT_DEBUG (1 << 4)
+#define _XABORT_NESTED (1 << 5)
+#define _XABORT_CODE(x) (((x) >> 24) & 0xff)
+
+#define _ABORT_LOCK_BUSY 0xff
+#define _ABORT_LOCK_IS_LOCKED 0xfe
+#define _ABORT_NESTED_TRYLOCK 0xfd
+
+#ifndef __ASSEMBLER__
+
+#define __force_inline __attribute__((__always_inline__)) inline
+
+static __force_inline int _xbegin(void)
+{
+ int ret = _XBEGIN_STARTED;
+ asm volatile (".byte 0xc7,0xf8 ; .long 0" : "+a" (ret) :: "memory");
+ return ret;
+}
+
+static __force_inline void _xend(void)
+{
+ asm volatile (".byte 0x0f,0x01,0xd5" ::: "memory");
+}
+
+static __force_inline void _xabort(const unsigned int status)
+{
+ asm volatile (".byte 0xc6,0xf8,%P0" :: "i" (status) : "memory");
+}
+
+static __force_inline int _xtest(void)
+{
+ unsigned char out;
+ asm volatile (".byte 0x0f,0x01,0xd6 ; setnz %0" : "=r" (out) :: "memory");
+ return out;
+}
+
+#endif
+#endif
--
2.30.0
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