From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AE36BC433DF for ; Mon, 22 Jun 2020 14:27:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8808C20760 for ; Mon, 22 Jun 2020 14:27:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="CcQ+0S6+" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729719AbgFVO1X (ORCPT ); Mon, 22 Jun 2020 10:27:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56680 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729155AbgFVO1U (ORCPT ); Mon, 22 Jun 2020 10:27:20 -0400 Received: from mail-pj1-x1042.google.com (mail-pj1-x1042.google.com [IPv6:2607:f8b0:4864:20::1042]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3A936C061573 for ; Mon, 22 Jun 2020 07:27:20 -0700 (PDT) Received: by mail-pj1-x1042.google.com with SMTP id i12so8239617pju.3 for ; Mon, 22 Jun 2020 07:27:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id; bh=3GI1uGL8qRj0UWsRg1f35/N6knURd5cco/VjWV8guxI=; b=CcQ+0S6+v97SJO9VqZ1l3zquEMKhBkbcW/mJDEWfKfhOwMPLFJd8tfH+lqmbqz5SEH wJe2AxmAsInK6RWKkFdunWoh0OZpYUei2rkv+4VsjH18jzdmSoWWbzfI+3TeuZ2ZcTZc DyDiyAcuwI0MJxW/DCAxav6ctw9GQsLe3aQLlmFsco10yy1oVcIx4uoPm4LQBQR08cYt jSe7oExrAEuFqb52wL+qT6kK4ZPX7LVJXEgB3s+gcBG7h5j7YuCyw5Fg5/chnvLQfeXB 4tYZ8jGawHQD9UufmWlaYnikek7LGVN/3/uxEjH+L1Pl74VKof4oz54ibaDXG0nahoMO nwoQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=3GI1uGL8qRj0UWsRg1f35/N6knURd5cco/VjWV8guxI=; b=HNJVadRQMEuoUYcrLNtYgIEcXWngwhPvjiIQhChfsVvdykgT9qMPyrjBzLZ+HxRGQR PmR777J1qfwe3R8ZPWmhBrD1FxwG8yF00yyEUJywNcztz4f1P9IkosHDAAJI/P7C6/kx eTMLRGDuHQjrS7WLD0MtmvmefilMFy/wwgAc7Bp/aEbUh2RJ5Ckb/+9WO4OeWMtFZI4b 5Ifd8uPk8rY1JjScrMG/CsWVt/kDqytEk0c7nOaOXQKgOBeb+pqraF1QZL4mwVm4E1Bk y7QX9eBkvLDio/qDdqcgF4zLybdyZMNerlK43SJ691OZev433ZJDudm4XplmYzEIdxGz qx0Q== X-Gm-Message-State: AOAM530XGDMNKk8L7+JUCeyvzzPCYoHb2C+Gf09VAPosW1d8Kse563kX pGuUnmQMqZ6ewIMgiVR2GvWsOA== X-Google-Smtp-Source: ABdhPJwIWQswOm3gAoyhRJ8B6sV7a9AiL57ArtJyCd3xKaqvSlNveqUuHLc4rb86sbspHNrCNoA0tw== X-Received: by 2002:a17:90a:acf:: with SMTP id r15mr19289807pje.171.1592836039745; Mon, 22 Jun 2020 07:27:19 -0700 (PDT) Received: from localhost.localdomain ([117.252.67.186]) by smtp.gmail.com with ESMTPSA id d6sm14547939pjh.5.2020.06.22.07.27.14 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 22 Jun 2020 07:27:18 -0700 (PDT) From: Sumit Garg To: kgdb-bugreport@lists.sourceforge.net, linux-serial@vger.kernel.org Cc: gregkh@linuxfoundation.org, daniel.thompson@linaro.org, jason.wessel@windriver.com, dianders@chromium.org, jslaby@suse.com, linux@armlinux.org.uk, linux-kernel@vger.kernel.org, Sumit Garg Subject: [PATCH 0/7] Enable support for kgdb NMI console feature Date: Mon, 22 Jun 2020 19:56:17 +0530 Message-Id: <1592835984-28613-1-git-send-email-sumit.garg@linaro.org> X-Mailer: git-send-email 2.7.4 Sender: linux-serial-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org This work is derived from Daniel's prior work here [1]. It has been rebased (tag: kgdb-5.8-rc1 + console hardening patch-set[2]), reworked to use serial RX interrupt as NMI (pseudo NMI on aarch64) in order to drop into debugger and tested on Developerbox (using amba-pl011). - Patch #1 is more of a fix required for NMI console to replace kgdb IO console. - Patches #2 to #6 adds an architecture agnostic fallback mechanism to enable kgdb NMI console using serial RX interrupt as NMI. - Patch #7 is an optimization patch that gets rid of inefficient timer based tasklet and rather uses irq_work. Usage of kgdb NMI console: - Enable "CONFIG_SERIAL_KGDB_NMI". - Kernel cmdline modification for Developerbox: console=ttyNMI0 kgdboc=ttyAMA0 [1] https://git.linaro.org/people/daniel.thompson/linux.git/log/?h=kgdb/polled_request_irq [2] https://lkml.org/lkml/2020/6/4/294 Daniel Thompson (5): tty: serial: Add poll_get_irq() to the polling interface kgdb: Add request_nmi() to the io ops table for kgdboc serial: kgdb_nmi: Add support for interrupt based fallback serial: 8250: Implement poll_get_irq() interface serial: kgdb_nmi: Replace hrtimer with irq_work ping Sumit Garg (2): serial: kgdb_nmi: Allow NMI console to replace kgdb IO console serial: amba-pl011: Implement poll_get_irq() interface drivers/tty/serial/8250/8250_port.c | 16 ++++++ drivers/tty/serial/amba-pl011.c | 12 +++++ drivers/tty/serial/kgdb_nmi.c | 100 ++++++++++++++++++++++++------------ drivers/tty/serial/kgdboc.c | 35 +++++++++++++ drivers/tty/serial/serial_core.c | 18 +++++++ include/linux/kgdb.h | 7 +++ include/linux/serial_core.h | 1 + include/linux/tty_driver.h | 1 + 8 files changed, 158 insertions(+), 32 deletions(-) -- 2.7.4