From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id C558DA04B2; Wed, 26 Aug 2020 11:56:12 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 35DAE1BEBA; Wed, 26 Aug 2020 11:56:05 +0200 (CEST) Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by dpdk.org (Postfix) with ESMTP id 3712814581 for ; Wed, 26 Aug 2020 11:56:03 +0200 (CEST) IronPort-SDR: NuYI3rLxVVWYXpjqRxHph5AoLVU0DHkwJOZc79TDF4czv1/qee9mwPk8vLNYcsqPB1pxn4UDvl cKJ0tfTQlsYw== X-IronPort-AV: E=McAfee;i="6000,8403,9724"; a="157301339" X-IronPort-AV: E=Sophos;i="5.76,355,1592895600"; d="scan'208";a="157301339" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Aug 2020 02:56:02 -0700 IronPort-SDR: JAUJ8jXHp2Wx0gvGTBEUL1+vT0oFkf6nBJP3TTe3G1Z/VS/lYjBON2zCgO46iwkyD4iYM+5RMW Ecf0+XK8QbqQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.76,355,1592895600"; d="scan'208";a="295319478" Received: from silpixa00400567.ir.intel.com ([10.237.214.190]) by orsmga003.jf.intel.com with ESMTP; 26 Aug 2020 02:55:59 -0700 From: Radu Nicolau To: dev@dpdk.org Cc: beilei.xing@intel.com, jia.guo@intel.com, bruce.richardson@intel.com, konstantin.ananyev@intel.com, jerinjacobk@gmail.com, david.marchand@redhat.com, fiona.trahe@intel.com, wei.zhao1@intel.com, ruifeng.wang@arm.com, qiming.yang@intel.com, qi.z.zhang@intel.com, Radu Nicolau Date: Wed, 26 Aug 2020 10:55:48 +0100 Message-Id: <20200826095552.82525-2-radu.nicolau@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200826095552.82525-1-radu.nicolau@intel.com> References: <1591870283-7776-1-git-send-email-radu.nicolau@intel.com> <20200826095552.82525-1-radu.nicolau@intel.com> Subject: [dpdk-dev] [PATCH v11 1/5] eal: add WC store functions X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Archived-At: List-Archive: Add rte_write32_wc and rte_write32_wc_relaxed functions that implement 32bit stores using write combining memory protocol. Provided generic stubs and x86 implementation. Signed-off-by: Radu Nicolau Acked-by: Bruce Richardson --- lib/librte_eal/arm/include/rte_io_64.h | 12 +++++++ lib/librte_eal/include/generic/rte_io.h | 48 +++++++++++++++++++++++++ lib/librte_eal/x86/include/rte_io.h | 42 ++++++++++++++++++++++ 3 files changed, 102 insertions(+) diff --git a/lib/librte_eal/arm/include/rte_io_64.h b/lib/librte_eal/arm/include/rte_io_64.h index e5346240e..d07d9cb22 100644 --- a/lib/librte_eal/arm/include/rte_io_64.h +++ b/lib/librte_eal/arm/include/rte_io_64.h @@ -164,6 +164,18 @@ rte_write64(uint64_t value, volatile void *addr) rte_write64_relaxed(value, addr); } +static __rte_always_inline void +rte_write32_wc(uint32_t value, volatile void *addr) +{ + rte_write32(value, addr); +} + +static __rte_always_inline void +rte_write32_wc_relaxed(uint32_t value, volatile void *addr) +{ + rte_write32_relaxed(value, addr); +} + #ifdef __cplusplus } #endif diff --git a/lib/librte_eal/include/generic/rte_io.h b/lib/librte_eal/include/generic/rte_io.h index da457f7f7..0669baa0b 100644 --- a/lib/librte_eal/include/generic/rte_io.h +++ b/lib/librte_eal/include/generic/rte_io.h @@ -229,6 +229,40 @@ rte_write32(uint32_t value, volatile void *addr); static inline void rte_write64(uint64_t value, volatile void *addr); +/** + * Write a 32-bit value to I/O device memory address addr using write + * combining memory write protocol. Depending on the platform write combining + * may not be available and/or may be treated as a hint and the behavior may + * fallback to a regular store. + * + * @param value + * Value to write + * @param addr + * I/O memory address to write the value to + */ +__rte_experimental +static inline void +rte_write32_wc(uint32_t value, volatile void *addr); + +/** + * Write a 32-bit value to I/O device memory address addr using write + * combining memory write protocol. Depending on the platform write combining + * may not be available and/or may be treated as a hint and the behavior may + * fallback to a regular store. + * + * The relaxed version does not have additional I/O memory barrier, useful in + * accessing the device registers of integrated controllers which implicitly + * strongly ordered with respect to memory access. + * + * @param value + * Value to write + * @param addr + * I/O memory address to write the value to + */ +__rte_experimental +static inline void +rte_write32_wc_relaxed(uint32_t value, volatile void *addr); + #endif /* __DOXYGEN__ */ #ifndef RTE_OVERRIDE_IO_H @@ -345,6 +379,20 @@ rte_write64(uint64_t value, volatile void *addr) rte_write64_relaxed(value, addr); } +#ifndef RTE_NATIVE_WRITE32_WC +static __rte_always_inline void +rte_write32_wc(uint32_t value, volatile void *addr) +{ + rte_write32(value, addr); +} + +static __rte_always_inline void +rte_write32_wc_relaxed(uint32_t value, volatile void *addr) +{ + rte_write32_relaxed(value, addr); +} +#endif /* RTE_NATIVE_WRITE32_WC */ + #endif /* RTE_OVERRIDE_IO_H */ #endif /* _RTE_IO_H_ */ diff --git a/lib/librte_eal/x86/include/rte_io.h b/lib/librte_eal/x86/include/rte_io.h index 2db71b1b0..4f4ff8b87 100644 --- a/lib/librte_eal/x86/include/rte_io.h +++ b/lib/librte_eal/x86/include/rte_io.h @@ -9,8 +9,50 @@ extern "C" { #endif +#include "rte_cpuflags.h" + +#define RTE_NATIVE_WRITE32_WC #include "generic/rte_io.h" +/** + * @internal + * MOVDIRI wrapper. + */ +static __rte_always_inline void +_rte_x86_movdiri(uint32_t value, volatile void *addr) +{ + asm volatile( + /* MOVDIRI */ + ".byte 0x40, 0x0f, 0x38, 0xf9, 0x02" + : + : "a" (value), "d" (addr)); +} + +static __rte_always_inline void +rte_write32_wc_relaxed(uint32_t value, volatile void *addr) +{ + static int _x86_movdiri_flag = -1; + if (_x86_movdiri_flag == 1) { + _rte_x86_movdiri(value, addr); + } else if (_x86_movdiri_flag == 0) { + rte_write32_relaxed(value, addr); + } else { + _x86_movdiri_flag = + (rte_cpu_get_flag_enabled(RTE_CPUFLAG_MOVDIRI) > 0); + if (_x86_movdiri_flag == 1) + _rte_x86_movdiri(value, addr); + else + rte_write32_relaxed(value, addr); + } +} + +static __rte_always_inline void +rte_write32_wc(uint32_t value, volatile void *addr) +{ + rte_wmb(); + rte_write32_wc_relaxed(value, addr); +} + #ifdef __cplusplus } #endif -- 2.17.1