From patchwork Tue Dec 5 00:38:08 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bart Van Assche X-Patchwork-Id: 10091771 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id E2D3E60329 for ; Tue, 5 Dec 2017 00:38:14 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D47A329114 for ; Tue, 5 Dec 2017 00:38:14 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C956C294CC; Tue, 5 Dec 2017 00:38:14 +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=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID 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 3E3AC29114 for ; Tue, 5 Dec 2017 00:38:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752020AbdLEAiM (ORCPT ); Mon, 4 Dec 2017 19:38:12 -0500 Received: from esa4.hgst.iphmx.com ([216.71.154.42]:4603 "EHLO esa4.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752035AbdLEAiL (ORCPT ); Mon, 4 Dec 2017 19:38:11 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1512434291; x=1543970291; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=kOunoo5GLeqzXUOBqBcdPJuvPtMXwSsDLU91kNE+vtk=; b=JtInbeD1i65g+NsnRcqaSrnTh32EcMnqT8bXuYZbo+XCP4PIZH8YoEZm Gj3XhB8zWcbAFZMFlRbh1KGV93zeaevWbJ/xu+5hibJeoWi1ZL14pM0UP T7/zF1uX55+KsNRYCdoii1hsozkgelSlrjU1NJXa9qZKvZ3l1e5FCpc2E UIefwg2Dh5V6f0JACuwAyPOKkm9rlrOBp4ZmPb4v8SwnTLOSfHm51R+V3 LfFIT65Sda7OnUq++fqml8pwjM6fVTDdFGMau0/UoFLuDPTNXI4wjIsE5 xYCZ5X3kEzfEj5gafSW1KoUV/1FpqYh9tfTkSoEeMDYHaFIlaKzRc3eDj g==; X-IronPort-AV: E=Sophos;i="5.45,362,1508774400"; d="scan'208";a="63968934" Received: from uls-op-cesaip01.wdc.com (HELO uls-op-cesaep01.wdc.com) ([199.255.45.14]) by ob1.hgst.iphmx.com with ESMTP; 05 Dec 2017 08:38:11 +0800 Received: from uls-op-cesaip02.wdc.com ([10.248.3.37]) by uls-op-cesaep01.wdc.com with ESMTP; 04 Dec 2017 16:35:22 -0800 Received: from thinkpad-bart.sdcorp.global.sandisk.com (HELO thinkpad-bart.int.fusionio.com) ([10.11.166.51]) by uls-op-cesaip02.wdc.com with ESMTP; 04 Dec 2017 16:38:10 -0800 From: Bart Van Assche To: Jens Axboe Cc: linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, Christoph Hellwig , Bart Van Assche , "James E . J . Bottomley" , "Martin K . Petersen" , Ming Lei , Hannes Reinecke , Johannes Thumshirn Subject: [PATCH 1/2] scsi-mq: Only show the CDB if available Date: Mon, 4 Dec 2017 16:38:08 -0800 Message-Id: <20171205003809.1705-2-bart.vanassche@wdc.com> X-Mailer: git-send-email 2.15.0 In-Reply-To: <20171205003809.1705-1-bart.vanassche@wdc.com> References: <20171205003809.1705-1-bart.vanassche@wdc.com> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Since the next patch will make it possible that scsi_show_rq() gets called before the CDB pointer is changed into a non-NULL value, only show the CDB if the CDB pointer is not NULL. Additionally, show the request timeout and SCSI command flags. This patch also fixes a bug that was reported by Ming Lei. See also Ming Lei, scsi_debugfs: fix crash in scsi_show_rq(), linux-scsi, 7 November 2017 (https://marc.info/?l=linux-block&m=151006655317188). Signed-off-by: Bart Van Assche Cc: James E.J. Bottomley Cc: Martin K. Petersen Cc: Ming Lei Cc: Christoph Hellwig Cc: Hannes Reinecke Cc: Johannes Thumshirn --- drivers/scsi/scsi_debugfs.c | 47 ++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 42 insertions(+), 5 deletions(-) diff --git a/drivers/scsi/scsi_debugfs.c b/drivers/scsi/scsi_debugfs.c index 01f08c03f2c1..37ed6bb8e6ec 100644 --- a/drivers/scsi/scsi_debugfs.c +++ b/drivers/scsi/scsi_debugfs.c @@ -4,13 +4,50 @@ #include #include "scsi_debugfs.h" +#define SCSI_CMD_FLAG_NAME(name) [ilog2(SCMD_##name)] = #name +static const char *const scsi_cmd_flags[] = { + SCSI_CMD_FLAG_NAME(TAGGED), + SCSI_CMD_FLAG_NAME(UNCHECKED_ISA_DMA), + SCSI_CMD_FLAG_NAME(ZONE_WRITE_LOCK), + SCSI_CMD_FLAG_NAME(INITIALIZED), +}; +#undef SCSI_CMD_FLAG_NAME + +static int scsi_flags_show(struct seq_file *m, const unsigned long flags, + const char *const *flag_name, int flag_name_count) +{ + bool sep = false; + int i; + + for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) { + if (!(flags & BIT(i))) + continue; + if (sep) + seq_puts(m, "|"); + sep = true; + if (i < flag_name_count && flag_name[i]) + seq_puts(m, flag_name[i]); + else + seq_printf(m, "%d", i); + } + return 0; +} + void scsi_show_rq(struct seq_file *m, struct request *rq) { struct scsi_cmnd *cmd = container_of(scsi_req(rq), typeof(*cmd), req); - int msecs = jiffies_to_msecs(jiffies - cmd->jiffies_at_alloc); - char buf[80]; + int alloc_ms = jiffies_to_msecs(jiffies - cmd->jiffies_at_alloc); + int timeout_ms = jiffies_to_msecs(rq->timeout); + const u8 *const cdb = READ_ONCE(cmd->cmnd); + char buf[80] = "(?)"; - __scsi_format_command(buf, sizeof(buf), cmd->cmnd, cmd->cmd_len); - seq_printf(m, ", .cmd=%s, .retries=%d, allocated %d.%03d s ago", buf, - cmd->retries, msecs / 1000, msecs % 1000); + if (cdb) + __scsi_format_command(buf, sizeof(buf), cdb, cmd->cmd_len); + seq_printf(m, ", .cmd=%s, .retries=%d, .result = %#x, .flags=", buf, + cmd->retries, cmd->result); + scsi_flags_show(m, cmd->flags, scsi_cmd_flags, + ARRAY_SIZE(scsi_cmd_flags)); + seq_printf(m, ", .timeout=%d.%03d, allocated %d.%03d s ago", + timeout_ms / 1000, timeout_ms % 1000, + alloc_ms / 1000, alloc_ms % 1000); }