--- /dev/null
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _RTE_SPINLOCK_X86_64_H_
+#define _RTE_SPINLOCK_X86_64_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "generic/rte_spinlock.h"
+#include "rte_rtm.h"
+#include "rte_cpuflags.h"
+#include "rte_branch_prediction.h"
+#include "rte_common.h"
+
+#define RTE_RTM_MAX_RETRIES (10)
+#define RTE_XABORT_LOCK_BUSY (0xff)
+
+#ifndef RTE_FORCE_INTRINSICS
+static inline void
+rte_spinlock_lock(rte_spinlock_t *sl)
+{
+ int lock_val = 1;
+ asm volatile (
+ "1:\n"
+ "xchg %[locked], %[lv]\n"
+ "test %[lv], %[lv]\n"
+ "jz 3f\n"
+ "2:\n"
+ "pause\n"
+ "cmpl $0, %[locked]\n"
+ "jnz 2b\n"
+ "jmp 1b\n"
+ "3:\n"
+ : [locked] "=m" (sl->locked), [lv] "=q" (lock_val)
+ : "[lv]" (lock_val)
+ : "memory");
+}
+
+static inline void
+rte_spinlock_unlock (rte_spinlock_t *sl)
+{
+ int unlock_val = 0;
+ asm volatile (
+ "xchg %[locked], %[ulv]\n"
+ : [locked] "=m" (sl->locked), [ulv] "=q" (unlock_val)
+ : "[ulv]" (unlock_val)
+ : "memory");
+}
+
+static inline int
+rte_spinlock_trylock (rte_spinlock_t *sl)
+{
+ int lockval = 1;
+
+ asm volatile (
+ "xchg %[locked], %[lockval]"
+ : [locked] "=m" (sl->locked), [lockval] "=q" (lockval)
+ : "[lockval]" (lockval)
+ : "memory");
+
+ return lockval == 0;
+}
+#endif
+
+static uint8_t rtm_supported; /* cache the flag to avoid the overhead
+ of the rte_cpu_get_flag_enabled function */
+
+static inline void __attribute__((constructor))
+rte_rtm_init(void)
+{
+ rtm_supported = rte_cpu_get_flag_enabled(RTE_CPUFLAG_RTM);
+}
+
+static inline int rte_tm_supported(void)
+{
+ return rtm_supported;
+}
+
+static inline int
+rte_try_tm(volatile int *lock)
+{
+ if (!rtm_supported)
+ return 0;
+
+ int retries = RTE_RTM_MAX_RETRIES;
+
+ while (likely(retries--)) {
+
+ unsigned int status = rte_xbegin();
+
+ if (likely(RTE_XBEGIN_STARTED == status)) {
+ if (unlikely(*lock))
+ rte_xabort(RTE_XABORT_LOCK_BUSY);
+ else
+ return 1;
+ }
+ while (*lock)
+ rte_pause();
+
+ if ((status & RTE_XABORT_EXPLICIT) &&
+ (RTE_XABORT_CODE(status) == RTE_XABORT_LOCK_BUSY))
+ continue;
+
+ if ((status & RTE_XABORT_RETRY) == 0) /* do not retry */
+ break;
+ }
+ return 0;
+}
+
+static inline void
+rte_spinlock_lock_tm(rte_spinlock_t *sl)
+{
+ if (likely(rte_try_tm(&sl->locked)))
+ return;
+
+ rte_spinlock_lock(sl); /* fall-back */
+}
+
+static inline int
+rte_spinlock_trylock_tm(rte_spinlock_t *sl)
+{
+ if (likely(rte_try_tm(&sl->locked)))
+ return 1;
+
+ return rte_spinlock_trylock(sl);
+}
+
+static inline void
+rte_spinlock_unlock_tm(rte_spinlock_t *sl)
+{
+ if (unlikely(sl->locked))
+ rte_spinlock_unlock(sl);
+ else
+ rte_xend();
+}
+
+static inline void
+rte_spinlock_recursive_lock_tm(rte_spinlock_recursive_t *slr)
+{
+ if (likely(rte_try_tm(&slr->sl.locked)))
+ return;
+
+ rte_spinlock_recursive_lock(slr); /* fall-back */
+}
+
+static inline void
+rte_spinlock_recursive_unlock_tm(rte_spinlock_recursive_t *slr)
+{
+ if (unlikely(slr->sl.locked))
+ rte_spinlock_recursive_unlock(slr);
+ else
+ rte_xend();
+}
+
+static inline int
+rte_spinlock_recursive_trylock_tm(rte_spinlock_recursive_t *slr)
+{
+ if (likely(rte_try_tm(&slr->sl.locked)))
+ return 1;
+
+ return rte_spinlock_recursive_trylock(slr);
+}
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_SPINLOCK_X86_64_H_ */
Code Review / deb_dpdk.git / blobdiff