From patchwork Tue Feb 9 06:24:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adrian Hunter X-Patchwork-Id: 379717 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 6547FC433E0 for ; Tue, 9 Feb 2021 06:26:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3166864E45 for ; Tue, 9 Feb 2021 06:26:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230241AbhBIGZs (ORCPT ); Tue, 9 Feb 2021 01:25:48 -0500 Received: from mga07.intel.com ([134.134.136.100]:37171 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230183AbhBIGZV (ORCPT ); Tue, 9 Feb 2021 01:25:21 -0500 IronPort-SDR: xncUHIOJlIidHgPfvnHcqgku9w8UPZlTBq2ka9SRS0OndOo1sktckJIwj5v3Y/9JHW7IDFrZVh /xMx6w1IGiWQ== X-IronPort-AV: E=McAfee;i="6000,8403,9889"; a="245904363" X-IronPort-AV: E=Sophos;i="5.81,164,1610438400"; d="scan'208";a="245904363" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Feb 2021 22:24:41 -0800 IronPort-SDR: akQes4JlNVqeFGDLbgIYq/YT+drWBmZUKTyEPZUROLF3xxwY076XB9GG8ULVstCmG0A1fWa17B 44LLQz0Da1DQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.81,164,1610438400"; d="scan'208";a="398681946" Received: from ahunter-desktop.fi.intel.com ([10.237.72.149]) by orsmga007.jf.intel.com with ESMTP; 08 Feb 2021 22:24:38 -0800 From: Adrian Hunter To: "Martin K . Petersen" , "James E . J . Bottomley" Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, Alim Akhtar , Avri Altman , Bean Huo , Can Guo , Stanley Chu Subject: [PATCH V2 1/4] scsi: ufs: Add exception event tracepoint Date: Tue, 9 Feb 2021 08:24:34 +0200 Message-Id: <20210209062437.6954-2-adrian.hunter@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210209062437.6954-1-adrian.hunter@intel.com> References: <20210209062437.6954-1-adrian.hunter@intel.com> Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki, Business Identity Code: 0357606 - 4, Domiciled in Helsinki Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Currently, exception event status can be read from wExceptionEventStatus attribute (sysfs file attributes/exception_event_status under the UFS host controller device directory). Polling that attribute to track UFS exception events is impractical, so add a tracepoint to track exception events for testing and debugging purposes. Note, by the time the exception event status is read, the exception event may have cleared, so the value can be zero - see example below. Note also, only enabled exception events can be reported. A subsequent patch adds the ability for users to enable selected exception events via debugfs. Example with driver instrumented to enable all exception events: # echo 1 > /sys/kernel/debug/tracing/events/ufs/ufshcd_exception_event/enable ... do some I/O ... # cat /sys/kernel/debug/tracing/trace # tracer: nop # # entries-in-buffer/entries-written: 3/3 #P:5 # # _-----=> irqs-off # / _----=> need-resched # | / _---=> hardirq/softirq # || / _--=> preempt-depth # ||| / delay # TASK-PID CPU# |||| TIMESTAMP FUNCTION # | | | |||| | | kworker/2:2-173 [002] .... 731.486419: ufshcd_exception_event: 0000:00:12.5: status 0x0 kworker/2:2-173 [002] .... 732.608918: ufshcd_exception_event: 0000:00:12.5: status 0x4 kworker/2:2-173 [002] .... 732.609312: ufshcd_exception_event: 0000:00:12.5: status 0x4 Signed-off-by: Adrian Hunter Reviewed-by: Avri Altman Reviewed-by: Bean Huo --- drivers/scsi/ufs/ufshcd.c | 2 ++ include/trace/events/ufs.h | 21 +++++++++++++++++++++ 2 files changed, 23 insertions(+) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 721f55db181f..d6fdce655388 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -5616,6 +5616,8 @@ static void ufshcd_exception_event_handler(struct work_struct *work) goto out; } + trace_ufshcd_exception_event(dev_name(hba->dev), status); + status &= hba->ee_ctrl_mask; if (status & MASK_EE_URGENT_BKOPS) diff --git a/include/trace/events/ufs.h b/include/trace/events/ufs.h index e151477d645c..1cb6f1afba0e 100644 --- a/include/trace/events/ufs.h +++ b/include/trace/events/ufs.h @@ -349,6 +349,27 @@ TRACE_EVENT(ufshcd_upiu, ) ); +TRACE_EVENT(ufshcd_exception_event, + + TP_PROTO(const char *dev_name, u16 status), + + TP_ARGS(dev_name, status), + + TP_STRUCT__entry( + __string(dev_name, dev_name) + __field(u16, status) + ), + + TP_fast_assign( + __assign_str(dev_name, dev_name); + __entry->status = status; + ), + + TP_printk("%s: status 0x%x", + __get_str(dev_name), __entry->status + ) +); + #endif /* if !defined(_TRACE_UFS_H) || defined(TRACE_HEADER_MULTI_READ) */ /* This part must be outside protection */