From 841e7ae58035395298765e47d1848404ce741ec3 Mon Sep 17 00:00:00 2001 From: Jerin Jacob Date: Mon, 5 Jun 2017 14:28:38 +0530 Subject: [PATCH 1/1] eal: introduce architecture specific pause function Each architecture may have different instructions for optimized and power consumption aware rte_pause() implementation. Signed-off-by: Jerin Jacob --- doc/api/doxy-api-index.md | 1 + lib/librte_eal/common/Makefile | 2 +- .../common/include/generic/rte_pause.h | 52 +++++++++++++++++++ 3 files changed, 54 insertions(+), 1 deletion(-) create mode 100644 lib/librte_eal/common/include/generic/rte_pause.h diff --git a/doc/api/doxy-api-index.md b/doc/api/doxy-api-index.md index f5f1f199f6..3b83288f96 100644 --- a/doc/api/doxy-api-index.md +++ b/doc/api/doxy-api-index.md @@ -77,6 +77,7 @@ There are many libraries, so their headers may be grouped by topics: [SIMD] (@ref rte_vect.h), [byte order] (@ref rte_byteorder.h), [CPU flags] (@ref rte_cpuflags.h), + [CPU pause] (@ref rte_pause.h), [I/O access] (@ref rte_io.h) - **CPU multicore**: diff --git a/lib/librte_eal/common/Makefile b/lib/librte_eal/common/Makefile index a5bd1089af..f2fe0522fe 100644 --- a/lib/librte_eal/common/Makefile +++ b/lib/librte_eal/common/Makefile @@ -44,7 +44,7 @@ INC += rte_malloc.h rte_keepalive.h rte_time.h GENERIC_INC := rte_atomic.h rte_byteorder.h rte_cycles.h rte_prefetch.h GENERIC_INC += rte_spinlock.h rte_memcpy.h rte_cpuflags.h rte_rwlock.h -GENERIC_INC += rte_vect.h rte_io.h +GENERIC_INC += rte_vect.h rte_pause.h rte_io.h # defined in mk/arch/$(RTE_ARCH)/rte.vars.mk ARCH_DIR ?= $(RTE_ARCH) diff --git a/lib/librte_eal/common/include/generic/rte_pause.h b/lib/librte_eal/common/include/generic/rte_pause.h new file mode 100644 index 0000000000..9625e580cb --- /dev/null +++ b/lib/librte_eal/common/include/generic/rte_pause.h @@ -0,0 +1,52 @@ +/*- + * BSD LICENSE + * + * Copyright(c) 2017 Cavium. 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 Cavium 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_PAUSE_H_ +#define _RTE_PAUSE_H_ + +/** + * @file + * + * CPU pause operation. + * + */ + +/** + * Pause CPU execution for a short while + * + * This call is intended for tight loops which poll a shared resource or wait + * for an event. A short pause within the loop may reduce the power consumption. + */ +static inline void rte_pause(void); + +#endif /* _RTE_PAUSE_H_ */ -- 2.20.1