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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0102FC74A44 for ; Thu, 9 Mar 2023 21:55:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231218AbjCIVzz (ORCPT ); Thu, 9 Mar 2023 16:55:55 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50214 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230151AbjCIVzi (ORCPT ); Thu, 9 Mar 2023 16:55:38 -0500 Received: from esa6.hgst.iphmx.com (esa6.hgst.iphmx.com [216.71.154.45]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C5682F0FEE; Thu, 9 Mar 2023 13:55:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1678398936; x=1709934936; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=WwnlqWsoVBHzfPUYpLG/cmPs9ofwbigIiW2nxUFV5w8=; b=M8n/gwtJkkF1e2l5mqDlDd9ASuKraA4Iq+ju5cpohuQDJ0LhQzgWP5Jm 7kPORdR1CHPrMOW3uuegXAHgqKrmBGQaJMIXdHhYp9suIWEbrXLdghpbb tB6B1OkUo4wEuvYvEFPQPueKgNib7pLWg4N+x8qB/X5Qs9Y7T9cP5dhpT 3LVvNdj8vK4x/7PwLLw5hovWQoSylznPa/XGCVP8orWIGUPBKXT5oRK4H oZLQGVZE1Tc4bkzqqr2UohrTgl2g1ikHZTGh2yDOY2B/S/Jfnzm4+T/uB PvV+2sJmlIKyyYeTY1bOVAZ8hRFjRhTE4VI8PKAcSpTuEkdvWqc8Vn5DA A==; X-IronPort-AV: E=Sophos;i="5.98,247,1673884800"; d="scan'208";a="225270955" Received: from h199-255-45-15.hgst.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 10 Mar 2023 05:55:36 +0800 IronPort-SDR: cqSfAEZJfAkGATXYUn2VtHTiI1n0cYB4gg3dgXYIogPmIYmgTWh5jhvIwGCZ71OB8EUFLkdnsx j/OrTXA4Mm3CUyNa6CzuvBTmysyCO5P+vrTIXIyxyH0d8G++4F4Ez8wSmckCJn+RhVSNd5DdSR lIztY0g4Moaxz+ov/sisNW3flS0zp32BWRP5AP6MV58rWr4hT+5Hgu0qtSof2jYRjurM3atN6B +DD9q+IuEZCD6xty6Cvcx+qg2UGjjJ9NnwMNdKCdi/L6oeCSzFvTfcQSmpL2Ji3Gn/+9o3SLH4 Re8= Received: from uls-op-cesaip01.wdc.com ([10.248.3.36]) by uls-op-cesaep02.wdc.com with ESMTP/TLS/ECDHE-RSA-AES128-GCM-SHA256; 09 Mar 2023 13:06:29 -0800 IronPort-SDR: K/OK8u+888tqI+XiFcIym9WhhKTU2RGrDGoveYjUDRlKfUv13vZmXLEwSYxVodW9Tw5R5lxiQf Z1uMjxnllZHFyuXVXRhGKD7KP0KIrPczhd4cfN9Vjc1Wkkf2WgkUbRwE/YGBM5NG2pK40SPJiK fIbWUM1+Y2gdRcWMm7JPyoMbpKh1lOvWXSasl9mdmF419hcHTB2Pngm6zqXzM2aNqpXVaiJ5DA aIOiDtdkEv8I84kH8Q4g35OJtxDamf89/5sJvvOHyM28hs5yUh078Iclfu5LofeplN/LSNiayZ qIk= WDCIronportException: Internal Received: from unknown (HELO x1-carbon.wdc.com) ([10.225.164.41]) by uls-op-cesaip01.wdc.com with ESMTP; 09 Mar 2023 13:55:35 -0800 From: Niklas Cassel To: "James E.J. Bottomley" , "Martin K. Petersen" Cc: Christoph Hellwig , Hannes Reinecke , Damien Le Moal , linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org, linux-block@vger.kernel.org, Niklas Cassel Subject: [PATCH v4 04/19] scsi: core: allow libata to complete successful commands via EH Date: Thu, 9 Mar 2023 22:54:56 +0100 Message-Id: <20230309215516.3800571-5-niklas.cassel@wdc.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230309215516.3800571-1-niklas.cassel@wdc.com> References: <20230309215516.3800571-1-niklas.cassel@wdc.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org In SCSI, we get the sense data as part of the completion, for ATA however, we need to fetch the sense data as an extra step. For an aborted ATA command the sense data is fetched via libata's ->eh_strategy_handler(). For Command Duration Limits policy 0xD: The device shall complete the command without error with the additional sense code set to DATA CURRENTLY UNAVAILABLE. In order to handle this policy in libata, we intend to send a successful command via SCSI EH, and let libata's ->eh_strategy_handler() fetch the sense data for the good command. This is similar to how we handle an aborted ATA command, just that we need to read the Successful NCQ Commands log instead of the NCQ Command Error log. When we get a SATA completion with successful commands, ATA_SENSE will be set, indicating that some commands in the completion have sense data. The sense_valid bitmask in the Sense Data for Successful NCQ Commands log will inform exactly which commands that had sense data, which might be a subset of all the commands that was completed in the same completion. (Yet all will have ATA_SENSE set, since the status is per completion.) The successful commands that have e.g. a "DATA CURRENTLY UNAVAILABLE" sense data will have a SCSI ML byte set, so scsi_eh_flush_done_q() will not set the scmd->result to DID_TIME_OUT for these commands. However, the successful commands that did not have sense data, must not get their result marked as DID_TIME_OUT by SCSI EH. Add a new flag SCMD_FORCE_EH_SUCCESS, which tells SCSI EH to not mark a command as DID_TIME_OUT, even if it has scmd->result == SAM_STAT_GOOD. This will be used by libata in a follow-up patch. Signed-off-by: Niklas Cassel Reviewed-by: Christoph Hellwig Reviewed-by: Hannes Reinecke --- drivers/scsi/scsi_error.c | 3 ++- include/scsi/scsi_cmnd.h | 5 +++++ 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index 2aa2c2aee6e7..cf5ec5f5f4f6 100644 --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -2165,7 +2165,8 @@ void scsi_eh_flush_done_q(struct list_head *done_q) * scsi_eh_get_sense), scmd->result is already * set, do not set DID_TIME_OUT. */ - if (!scmd->result) + if (!scmd->result && + !(scmd->flags & SCMD_FORCE_EH_SUCCESS)) scmd->result |= (DID_TIME_OUT << 16); SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h index c2cb5f69635c..526def14e7fb 100644 --- a/include/scsi/scsi_cmnd.h +++ b/include/scsi/scsi_cmnd.h @@ -52,6 +52,11 @@ struct scsi_pointer { #define SCMD_TAGGED (1 << 0) #define SCMD_INITIALIZED (1 << 1) #define SCMD_LAST (1 << 2) +/* + * libata uses SCSI EH to fetch sense data for successful commands. + * SCSI EH should not overwrite scmd->result when SCMD_FORCE_EH_SUCCESS is set. + */ +#define SCMD_FORCE_EH_SUCCESS (1 << 3) #define SCMD_FAIL_IF_RECOVERING (1 << 4) /* flags preserved across unprep / reprep */ #define SCMD_PRESERVED_FLAGS (SCMD_INITIALIZED | SCMD_FAIL_IF_RECOVERING) -- 2.39.2