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 E010EA04A3; Thu, 11 Jun 2020 14:23:45 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id C15A52BAB; Thu, 11 Jun 2020 14:23:45 +0200 (CEST) Received: from mail-il1-f195.google.com (mail-il1-f195.google.com [209.85.166.195]) by dpdk.org (Postfix) with ESMTP id 08E472BAA for ; Thu, 11 Jun 2020 14:23:44 +0200 (CEST) Received: by mail-il1-f195.google.com with SMTP id b5so5206240iln.5 for ; Thu, 11 Jun 2020 05:23:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=NyoMrNE0Kskeac1VikWU/3cpBw8IonYwLv5TqTjzVcM=; b=nmhxegaN797iJCe7il6m+8leWPo2Wjql7NO7P3LjYn7q3tLl5oY7cLvh69aXQ4qdkZ FRTlYbX83HKVH/YfAn3L5klOkmvazdRrCXiVQqbpJEd/7cR72QrmeR95WcKFBUjWzti4 vzToNVsAEqLrnXznyf1OfiQsuPlqMvciUQOUTrtLAw8SghAtM4nX8XjpdHRD4DbVMlkQ 8MZTzqOi0XpHX4Uijze+x4fksU3CXcWtMi/7jO5IStmQXd34WwCVrVb8wFkaFtbh6Fxu xsAV7hqpYZHKq0xa2Vi8VozjZc7rxVIaUPHHGdTMUHT6s7T21dyBeqbM6QpaCjZ1hZ9n +kCw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=NyoMrNE0Kskeac1VikWU/3cpBw8IonYwLv5TqTjzVcM=; b=owmwS9FyPmo10PJuc1wsLZMZWQRTCCeZwDVvHgDtlANFPvuM+qTYe/kyFHCUwk4zcw pdmsNUVz15CqHsqIX4lwfS3THYffaMlrj/xCmzUy3SezfOWD9AIP4HqMIqQhnLZBxAe6 bTHnWpyrXPbr6OB6jP/3l72tKCA//i6YkISU6ojGtJkRKrwZemtaXs6+sX0vtmJkZ39p Nb3TwzPzUoIegalhgZyRuuw412hujlkgWqfcKz5EShMgddJwe0zfj9u3j+6MTEKmwMN4 ZZIZ7/gs0AnbiFRGxD/xbqFaqvgqpUzWsmvzY95KMDgcKvHIrAmtShnQ1/KLF5p1MCe6 BsOw== X-Gm-Message-State: AOAM530nfbiNXJl8akbuUgcDzNIs3+2sGBg55Cj1I+T25jN2U2/YMsol 2vAtMew58uy6pilWTTFpdHXDfs/lwvaHC9+L1OI= X-Google-Smtp-Source: ABdhPJz9lP7iXGWGQiLckwJLQc1JjWVVNh+I8xLEVzfjzjlnne76VtQr4TtVedD4Xso+kxmUMNhWItSMdFGpffWpDtw= X-Received: by 2002:a92:dc47:: with SMTP id x7mr8031787ilq.130.1591878223237; Thu, 11 Jun 2020 05:23:43 -0700 (PDT) MIME-Version: 1.0 References: <1591870283-7776-1-git-send-email-radu.nicolau@intel.com> In-Reply-To: <1591870283-7776-1-git-send-email-radu.nicolau@intel.com> From: Jerin Jacob Date: Thu, 11 Jun 2020 17:53:27 +0530 Message-ID: To: Radu Nicolau Cc: dpdk-dev , Beilei Xing , jia.guo@intel.com, "Richardson, Bruce" , "Ananyev, Konstantin" Content-Type: text/plain; charset="UTF-8" Subject: Re: [dpdk-dev] [PATCH v1 1/2] eal/x86: add WC store function 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" On Thu, Jun 11, 2020 at 3:41 PM Radu Nicolau wrote: > > Add rte_write32_wc function that implements a WC store > using movdiri instruction. > > Signed-off-by: Radu Nicolau > --- > lib/librte_eal/x86/include/rte_io.h | 20 ++++++++++++++++++++ > 1 file changed, 20 insertions(+) > > diff --git a/lib/librte_eal/x86/include/rte_io.h b/lib/librte_eal/x86/include/rte_io.h > index 2db71b1..3d74bec 100644 > --- a/lib/librte_eal/x86/include/rte_io.h > +++ b/lib/librte_eal/x86/include/rte_io.h > @@ -11,6 +11,26 @@ extern "C" { > > #include "generic/rte_io.h" > > +/** > + * Write a 32-bit value to I/O device memory address *addr*. > + * Uses MOVDIRI instruction to perform a direct-store operation using WC > + * memory write protocol. It will be an x86 specific API, Please change the API name to reflect that. > + * > + * @param value > + * Value to write > + * @param addr > + * I/O memory address to write the value to > + */ > +static __rte_always_inline void > +rte_write32_wc(uint32_t value, volatile void *addr) > +{ > + asm volatile("sfence\n\t" > + /* MOVDIRI */ > + ".byte 0x40, 0x0f, 0x38, 0xf9, 0x02" > + : > + : "a" (value), "d" (addr)); > +} > + > #ifdef __cplusplus > } > #endif > -- > 2.7.4 >