From owner-freebsd-current@freebsd.org Wed Mar 30 17:47:27 2016 Return-Path: Delivered-To: freebsd-current@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 37C34AE3DB6 for ; Wed, 30 Mar 2016 17:47:27 +0000 (UTC) (envelope-from rizzo.unipi@gmail.com) Received: from mail-lf0-x231.google.com (mail-lf0-x231.google.com [IPv6:2a00:1450:4010:c07::231]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id B497B1EB5 for ; Wed, 30 Mar 2016 17:47:26 +0000 (UTC) (envelope-from rizzo.unipi@gmail.com) Received: by mail-lf0-x231.google.com with SMTP id k79so41773766lfb.2 for ; Wed, 30 Mar 2016 10:47:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:date:message-id:subject:from:to; bh=PLYmc1g0/xKzeNIpFO3QnQmpdih5/qszH111l4Bc4Qk=; b=OCXrgvqsP+ktE4pSNxcDT8QZ63Sc0gfaOOJdAG9H9mPZaRrCimkPhPdcj6r8sPawtL rp9EJHYI2JbEtgjPhXV51504VuXjcKhc35QWOS4CFfWEHSqxMlNjWxPj+LXG9jB+tLxn UCTLd1PMKdh8SwW5u3Ig1PxB+p2uPnwwLRu6Hhztn0fbid4LVoTCJ16SXxqxQpxuzQ+p ym4r6iugCEN6RWdzQtxfzdir7+/0CsQ8T9qDMuzmzSDzVico4rp9K7MjhNmTmxtXKPhw 1t+bwAZb1QBM/M5Gp4QO3JzUqIIWiov8xRzQJdgHCqbTyakNiNXE89rVMlQL6cKv384Q dGHg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:sender:date:message-id:subject:from :to; bh=PLYmc1g0/xKzeNIpFO3QnQmpdih5/qszH111l4Bc4Qk=; b=EomZbW/sIUppIA2nXL8Lj5kd6k+gL1Cbfm29YlYRd3qkuu53I/nego3y4nl2eXyiV5 K5daTfdNfluwYFmigw51mzNruXDUe/EDZmXneaecBBW7fqsA6b17ZqbyF5GDndgWRAXv X9wPok+hqkr6iUxnw0/vsnmnu2aulhwi+fC5YQqYZ/dMxDxxtQ5Xi2CwdTptHhzdESvN eX5PrYYQGIa7uYXamitHG/KNWeIQxGb5xh3lSARW2r953rlWHIAbVl6o4kiPDJX9KEVr cS7R+NAOLxUCxpci9wEjiPBhRwG5KZPW7cd810NP99UcudUcCJ9ZGkyXE3JYasSsbheC roGg== X-Gm-Message-State: AD7BkJKDmYFI7/o/vqBWerztt66FB3n15RcyIUgHf/6MwMXy8zGTH1f8wICoiQSw93t9DDz1c94zwI73jQzZRQ== MIME-Version: 1.0 X-Received: by 10.25.213.145 with SMTP id m139mr4652598lfg.96.1459360045071; Wed, 30 Mar 2016 10:47:25 -0700 (PDT) Sender: rizzo.unipi@gmail.com Received: by 10.114.184.146 with HTTP; Wed, 30 Mar 2016 10:47:25 -0700 (PDT) Date: Wed, 30 Mar 2016 19:47:25 +0200 X-Google-Sender-Auth: qaKNwOLjNixyqLE9QdWaKf2Iu3I Message-ID: Subject: accessing a PCIe register from userspace through kmem or other ways ? From: Luigi Rizzo To: freebsd-current Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.21 X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 30 Mar 2016 17:47:27 -0000 Hi, I'd like to test the rate at which I can access device registers on a PCIe card, and was wondering whether I need to patch a device driver, or perhaps I can use /dev/kmem once I figure out where the registers are mapped ? thanks luigi -- -----------------------------------------+------------------------------- Prof. Luigi RIZZO, rizzo@iet.unipi.it . Dip. di Ing. dell'Informazione http://www.iet.unipi.it/~luigi/ . Universita` di Pisa TEL +39-050-2217533 . via Diotisalvi 2 Mobile +39-338-6809875 . 56122 PISA (Italy) -----------------------------------------+-------------------------------