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 29DCCA00BE; Tue, 7 Jul 2020 10:36:46 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 76EFE1DA26; Tue, 7 Jul 2020 10:36:45 +0200 (CEST) Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [207.211.31.120]) by dpdk.org (Postfix) with ESMTP id A1E8B1DA24 for ; Tue, 7 Jul 2020 10:36:43 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1594111003; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=2h3hc2Dh7ETGY01RsiXA32VDm640r+YJHX6Dfvlpz6I=; b=GHiSdeHIwMvoWt62EfLNjL0xy/m2np2bD4BtlW1yVvxp1ehUcO1wL5NTVpxozOaD38filN ZqeLvsQr8GDcEOVNrSxzybfBlb0HRvCp+Z0ftB/z6NEjEE7YD3jhC2KDugmhGNjq8Kr1Df xm7FXvtE2AKW/s85EtrWvpXH1Jq4aQs= Received: from mail-ua1-f71.google.com (mail-ua1-f71.google.com [209.85.222.71]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-49-yzW2GOpNMGSVhmwJXea8JA-1; Tue, 07 Jul 2020 04:36:41 -0400 X-MC-Unique: yzW2GOpNMGSVhmwJXea8JA-1 Received: by mail-ua1-f71.google.com with SMTP id h88so11583240uah.9 for ; Tue, 07 Jul 2020 01:36:41 -0700 (PDT) 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=2h3hc2Dh7ETGY01RsiXA32VDm640r+YJHX6Dfvlpz6I=; b=UFfqMzsMAgxVB0z0bCap4XVGmcwGP86dJiLEUAognSLkiO/213mjUIXT6El5C+SZQv ezVQkOuFpl3OToSQyT56oNBfJcx3f08SGMv0AdntU9vBmjGAobCXnO/dRAGePb1GK6GV 65aylXjJ0fsYATSDw0RcM8vu/N7Lch7jRStjmY06SP31WDH+xI5/uSDexlCYhs6ASMRX x3HPqjvI8z32/y9HJuysHSjPOaeELFzsG+KiKENryNzVDx6p69ETzYs8pCy7U3XsjnVh 1BAQzTPlAUaaYjQOjrEM09nIemUI9a39uPQrPLjTCzfhjm03kOC/BGso2mosX00fQSK6 mhug== X-Gm-Message-State: AOAM530YB+ya46Fpemaxej32YHqUroCSKmed5MrYkH3dRUERdCwankqK 4tSWYmUuN1cwRf3qIY40BdQFRtBzeKRkta+rqJFISjvTUqu6pmmmWU1ZvSj1LmMlhr7FyL+GtTo Ao6JGn4mFo7iRWyeAe3Q= X-Received: by 2002:ac5:ccaf:: with SMTP id p15mr30954852vkm.12.1594111000927; Tue, 07 Jul 2020 01:36:40 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyV/twQX/iywZxZNPNUjYF3OeTGB6Np19U3Su4LYNTaroifMPQP9Gi4gtHXBv5dQJMewG9ysZCHjwD918BPl0Q= X-Received: by 2002:ac5:ccaf:: with SMTP id p15mr30954838vkm.12.1594111000699; Tue, 07 Jul 2020 01:36:40 -0700 (PDT) MIME-Version: 1.0 References: <20200410164127.54229-1-gavin.hu@arm.com> <20200706234333.26310-1-honnappa.nagarahalli@arm.com> <20200706234333.26310-2-honnappa.nagarahalli@arm.com> In-Reply-To: <20200706234333.26310-2-honnappa.nagarahalli@arm.com> From: David Marchand Date: Tue, 7 Jul 2020 10:36:29 +0200 Message-ID: To: Honnappa Nagarahalli Cc: dev , "Ruifeng Wang (Arm Technology China)" , Jerin Jacob Kollanukkaran , Hemant Agrawal , Ajit Khaparde , Igor Chauskin , Thomas Monjalon , Viacheslav Ovsiienko , Andrew Rybchenko , Bruce Richardson , nd Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dmarchan@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="UTF-8" Subject: Re: [dpdk-dev] [PATCH v4 2/3] doc: update armv8-a IO barrier changes 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 Tue, Jul 7, 2020 at 1:44 AM Honnappa Nagarahalli wrote: > > Updated the use of DMB instruction in rte_*mb APIs for Armv8-a. > > Signed-off-by: Honnappa Nagarahalli > Acked-by: Jerin Jacob > --- > doc/guides/rel_notes/release_20_08.rst | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/doc/guides/rel_notes/release_20_08.rst b/doc/guides/rel_notes/release_20_08.rst > index 5cbc4ce14..567ae6b2a 100644 > --- a/doc/guides/rel_notes/release_20_08.rst > +++ b/doc/guides/rel_notes/release_20_08.rst > @@ -56,6 +56,13 @@ New Features > Also, make sure to start the actual text at the margin. > ========================================================= > This release note update will be squashed with the change itself in patch 1. > +* **rte_*mb APIs are updated to use DMB instruction for Armv8-a.** We use "ARMv8" in the release notes, any objection if I update this when applying? > + > + Armv8-a memory model has been strengthened to require other-multi-copy > + atomicity. This allows for using DMB instruction instead of DSB for IO > + barriers. rte_*mb APIs, for Armv8-a platforms, are changed to use DMB > + instruction to reflect this. > + > * **Updated PCAP driver.** > > Updated PCAP driver with new features and improvements, including: > -- > 2.17.1 > -- David Marchand