From patchwork Fri May 17 20:59:41 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jerry Hoemann X-Patchwork-Id: 10948587 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 014A913AD for ; Fri, 17 May 2019 21:03:00 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E63BE28477 for ; Fri, 17 May 2019 21:02:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DA81028479; Fri, 17 May 2019 21:02:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 75F8C28477 for ; Fri, 17 May 2019 21:02:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729432AbfEQVCj (ORCPT ); Fri, 17 May 2019 17:02:39 -0400 Received: from mx0b-002e3701.pphosted.com ([148.163.143.35]:36100 "EHLO mx0b-002e3701.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729312AbfEQVCj (ORCPT ); Fri, 17 May 2019 17:02:39 -0400 Received: from pps.filterd (m0134424.ppops.net [127.0.0.1]) by mx0b-002e3701.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x4HL12mX004645; Fri, 17 May 2019 21:02:08 GMT Received: from g2t2353.austin.hpe.com (g2t2353.austin.hpe.com [15.233.44.26]) by mx0b-002e3701.pphosted.com with ESMTP id 2sj2yngk0w-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 17 May 2019 21:02:08 +0000 Received: from g2t2360.austin.hpecorp.net (g2t2360.austin.hpecorp.net [16.196.225.135]) by g2t2353.austin.hpe.com (Postfix) with ESMTP id CE1F390; Fri, 17 May 2019 21:02:07 +0000 (UTC) Received: from lxbuild.ftc.rdlabs.hpecorp.net (lxbuild.ftc.rdlabs.hpecorp.net [16.78.34.175]) by g2t2360.austin.hpecorp.net (Postfix) with ESMTP id 836704B; Fri, 17 May 2019 21:02:07 +0000 (UTC) From: Jerry Hoemann To: linux@roeck-us.net, wim@linux-watchdog.org, linux-watchdog@vger.kernel.org Cc: linux-kernel@vger.kernel.org, mironov.ivan@gmail.com, rasmus.villemoes@prevas.dk, jerry.hoemann@hpe.com Subject: [PATCH 4/6] watchdog/hpwdt: Add module parameter kdumptimeout. Date: Fri, 17 May 2019 14:59:41 -0600 Message-Id: <1558126783-4877-5-git-send-email-jerry.hoemann@hpe.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1558126783-4877-1-git-send-email-jerry.hoemann@hpe.com> References: <1558126783-4877-1-git-send-email-jerry.hoemann@hpe.com> X-HPE-SCL: -1 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-05-17_13:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1905170125 Sender: linux-watchdog-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Instead of unconditionally stopping the watchdog timer after receipt of a pretimeout NMI, reprogram the timeout based upon module parameter kdumptimeout. The provides a more flexible override than the depricated allow_kdump. Signed-off-by: Jerry Hoemann Reviewed-by: Guenter Roeck --- drivers/watchdog/hpwdt.c | 27 ++++++++++++++++++++++++--- 1 file changed, 24 insertions(+), 3 deletions(-) diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c index aa4101c..dc65006 100644 --- a/drivers/watchdog/hpwdt.c +++ b/drivers/watchdog/hpwdt.c @@ -29,7 +29,8 @@ #define HPWDT_VERSION "2.0.2" #define SECS_TO_TICKS(secs) ((secs) * 1000 / 128) #define TICKS_TO_SECS(ticks) ((ticks) * 128 / 1000) -#define HPWDT_MAX_TIMER TICKS_TO_SECS(65535) +#define HPWDT_MAX_TICKS 65535 +#define HPWDT_MAX_TIMER TICKS_TO_SECS(HPWDT_MAX_TICKS) #define DEFAULT_MARGIN 30 #define PRETIMEOUT_SEC 9 @@ -37,6 +38,7 @@ static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */ static bool nowayout = WATCHDOG_NOWAYOUT; static bool pretimeout = IS_ENABLED(CONFIG_HPWDT_NMI_DECODING); +static int kdumptimeout = -1; static void __iomem *pci_mem_addr; /* the PCI-memory address */ static unsigned long __iomem *hpwdt_nmistat; @@ -56,6 +58,7 @@ {0}, /* terminate list */ }; +static struct watchdog_device hpwdt_dev; /* * Watchdog operations */ @@ -94,12 +97,18 @@ static int hpwdt_stop_core(struct watchdog_device *wdd) return 0; } +static void hpwdt_ping_ticks(int val) +{ + val = min(val, HPWDT_MAX_TICKS); + iowrite16(val, hpwdt_timer_reg); +} + static int hpwdt_ping(struct watchdog_device *wdd) { int reload = SECS_TO_TICKS(min(wdd->timeout, wdd->max_hw_heartbeat_ms/1000)); dev_dbg(wdd->parent, "ping watchdog 0x%08x:0x%08x\n", wdd->timeout, reload); - iowrite16(reload, hpwdt_timer_reg); + hpwdt_ping_ticks(reload); return 0; } @@ -175,7 +184,14 @@ static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs) if (ilo5 && !pretimeout && !mynmi) return NMI_DONE; - hpwdt_stop(); + if (kdumptimeout < 0) + hpwdt_stop(); + else if (kdumptimeout == 0) + ; + else { + unsigned int val = max((unsigned int)kdumptimeout, hpwdt_dev.timeout); + hpwdt_ping_ticks(SECS_TO_TICKS(val)); + } hex_byte_pack(panic_msg, mynmi); nmi_panic(regs, panic_msg); @@ -328,6 +344,7 @@ static int hpwdt_init_one(struct pci_dev *dev, pretimeout = 0; } hpwdt_dev.pretimeout = pretimeout ? PRETIMEOUT_SEC : 0; + kdumptimeout = min(kdumptimeout, HPWDT_MAX_TIMER); hpwdt_dev.parent = &dev->dev; retval = watchdog_register_device(&hpwdt_dev); @@ -342,6 +359,7 @@ static int hpwdt_init_one(struct pci_dev *dev, hpwdt_dev.timeout, nowayout); dev_info(&dev->dev, "pretimeout: %s.\n", pretimeout ? "on" : "off"); + dev_info(&dev->dev, "kdumptimeout: %d.\n", kdumptimeout); if (dev->subsystem_vendor == PCI_VENDOR_ID_HP_3PAR) ilo5 = true; @@ -387,6 +405,9 @@ static void hpwdt_exit(struct pci_dev *dev) MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); +module_param(kdumptimeout, int, 0444); +MODULE_PARM_DESC(kdumptimeout, "Timeout applied for crash kernel transition in seconds"); + #ifdef CONFIG_HPWDT_NMI_DECODING module_param(pretimeout, bool, 0); MODULE_PARM_DESC(pretimeout, "Watchdog pretimeout enabled");