From patchwork Wed Jun 29 23:56:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bart Van Assche X-Patchwork-Id: 586036 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 A34C0CCA47C for ; Wed, 29 Jun 2022 23:56:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231968AbiF2X4V (ORCPT ); Wed, 29 Jun 2022 19:56:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60828 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232032AbiF2X4R (ORCPT ); Wed, 29 Jun 2022 19:56:17 -0400 Received: from mail-pf1-f172.google.com (mail-pf1-f172.google.com [209.85.210.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3A4B72715E for ; Wed, 29 Jun 2022 16:56:16 -0700 (PDT) Received: by mail-pf1-f172.google.com with SMTP id 65so16493830pfw.11 for ; Wed, 29 Jun 2022 16:56:16 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=6r7IppzMlEf5XXXvoQHXzVy/6OXtWFNCsNcAA8rtj10=; b=DfBCzg/PrVutyIG0nl+ETZ0NO40WCc3039OVxs55bmtEsZpoocWT1/2ufUiOZFQntZ ODqXZj3bXVdWOryxjGtPGaABrekwtns7Z11IoBRWbwAjIdcK1rrp/TGnJUcMuUEp8RzH F75VYbQxBsOrlVnl8TH+RNKnssttEyyM+jkgIR8fjuujDREdLlj4bOeI6HeUyzkGIxMG noXunYo5kL7HrnHVsCoqvpK4R/X3pen8qyubK2tnwX/a+2b6uYtF0OwRa+m++qBLcVZv N3WYAwz/R8mIZ5CQRo1Hh7Mk3LIjDd7zml+OCsNDZKl/D0/vMfkUHuEK5bziCpTPG/nJ C9ww== X-Gm-Message-State: AJIora/80rWLKhGOwNuhOo37IP7v7F3J/hjfZdv7hq7dEqquKDLr9PkZ +wlVHoLPWj8WKwPBk7FgKlk= X-Google-Smtp-Source: AGRyM1umKq2BJ3ouXWZ3bkbB35wFZNN2jT8ilCss1qFYS0Zlr8zJaWqO7+zdNKd/n8SRg1D1Ky11tw== X-Received: by 2002:a05:6a00:d9b:b0:525:7208:3d9 with SMTP id bf27-20020a056a000d9b00b00525720803d9mr11474249pfb.82.1656546975655; Wed, 29 Jun 2022 16:56:15 -0700 (PDT) Received: from bvanassche-linux.mtv.corp.google.com ([2620:15c:211:201:3841:49ce:cba5:1586]) by smtp.gmail.com with ESMTPSA id s5-20020a170902988500b00161947ecc82sm11932222plp.199.2022.06.29.16.56.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Jun 2022 16:56:15 -0700 (PDT) From: Bart Van Assche To: "Martin K . Petersen" Cc: Jaegeuk Kim , linux-scsi@vger.kernel.org, Bart Van Assche , Ming Lei , Hannes Reinecke , John Garry , ericspero@icloud.com, jason600.groome@gmail.com Subject: [PATCH v2 2/2] scsi: sd: Rework asynchronous resume support Date: Wed, 29 Jun 2022 16:56:06 -0700 Message-Id: <20220629235606.2787919-3-bvanassche@acm.org> X-Mailer: git-send-email 2.37.0.rc0.161.g10f37bed90-goog In-Reply-To: <20220629235606.2787919-1-bvanassche@acm.org> References: <20220629235606.2787919-1-bvanassche@acm.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org For some technologies, e.g. an ATA bus, resuming can take multiple seconds. Waiting for resume to finish can cause a very noticeable delay. Hence this patch that restores the behavior from before patch "scsi: core: pm: Rely on the device driver core for async power management" for most SCSI devices. This patch introduces a behavior change: if the START command fails, do not consider this as a SCSI disk resume failure. Cc: Ming Lei Cc: Hannes Reinecke Cc: John Garry Cc: ericspero@icloud.com Cc: jason600.groome@gmail.com Tested-by: jason600.groome@gmail.com Link: https://bugzilla.kernel.org/show_bug.cgi?id=215880 Fixes: a19a93e4c6a9 ("scsi: core: pm: Rely on the device driver core for async power management") Signed-off-by: Bart Van Assche --- drivers/scsi/sd.c | 79 ++++++++++++++++++++++++++++++++++++----------- drivers/scsi/sd.h | 5 +++ 2 files changed, 66 insertions(+), 18 deletions(-) diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 895b56c8f25e..06888b675e71 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -103,6 +103,7 @@ static void sd_config_discard(struct scsi_disk *, unsigned int); static void sd_config_write_same(struct scsi_disk *); static int sd_revalidate_disk(struct gendisk *); static void sd_unlock_native_capacity(struct gendisk *disk); +static void sd_start_done_work(struct work_struct *work); static int sd_probe(struct device *); static int sd_remove(struct device *); static void sd_shutdown(struct device *); @@ -3463,6 +3464,7 @@ static int sd_probe(struct device *dev) sdkp->max_retries = SD_MAX_RETRIES; atomic_set(&sdkp->openers, 0); atomic_set(&sdkp->device->ioerr_cnt, 0); + INIT_WORK(&sdkp->start_done_work, sd_start_done_work); if (!sdp->request_queue->rq_timeout) { if (sdp->type != TYPE_MOD) @@ -3585,12 +3587,64 @@ static void scsi_disk_release(struct device *dev) kfree(sdkp); } +/* Process sense data after a START command finished. */ +static void sd_start_done_work(struct work_struct *work) +{ + struct scsi_disk *sdkp = container_of(work, typeof(*sdkp), + start_done_work); + struct scsi_sense_hdr sshdr; + int res = sdkp->start_result; + + if (res == 0) + return; + + sd_print_result(sdkp, "Start/Stop Unit failed", res); + if (res > 0 && scsi_normalize_sense(sdkp->start_sense_buffer, + sdkp->start_sense_len, &sshdr)) + sd_print_sense_hdr(sdkp, &sshdr); +} + +/* A START command finished. May be called from interrupt context. */ +static void sd_start_done(struct request *req, blk_status_t status) +{ + const struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(req); + struct scsi_disk *sdkp = scsi_disk(req->q->disk); + + sdkp->start_result = scmd->result; + WARN_ON_ONCE(scmd->sense_len > SCSI_SENSE_BUFFERSIZE); + sdkp->start_sense_len = scmd->sense_len; + memcpy(sdkp->start_sense_buffer, scmd->sense_buffer, scmd->sense_len); + WARN_ON_ONCE(!schedule_work(&sdkp->start_done_work)); +} + +/* Submit a START command asynchronously. */ +static int sd_submit_start(struct scsi_disk *sdkp, u8 cmd[], u8 cmd_len) +{ + struct scsi_device *sdev = sdkp->device; + struct request_queue *q = sdev->request_queue; + struct request *req; + struct scsi_cmnd *scmd; + + req = scsi_alloc_request(q, REQ_OP_DRV_IN, BLK_MQ_REQ_PM); + if (IS_ERR(req)) + return PTR_ERR(req); + + scmd = blk_mq_rq_to_pdu(req); + scmd->cmd_len = cmd_len; + memcpy(scmd->cmnd, cmd, cmd_len); + scmd->allowed = sdkp->max_retries; + req->timeout = SD_TIMEOUT; + req->rq_flags |= RQF_PM | RQF_QUIET; + req->end_io = sd_start_done; + blk_execute_rq_nowait(req, /*at_head=*/true); + + return 0; +} + static int sd_start_stop_device(struct scsi_disk *sdkp, int start) { unsigned char cmd[6] = { START_STOP }; /* START_VALID */ - struct scsi_sense_hdr sshdr; struct scsi_device *sdp = sdkp->device; - int res; if (start) cmd[4] |= 1; /* START */ @@ -3601,23 +3655,10 @@ static int sd_start_stop_device(struct scsi_disk *sdkp, int start) if (!scsi_device_online(sdp)) return -ENODEV; - res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr, - SD_TIMEOUT, sdkp->max_retries, 0, RQF_PM, NULL); - if (res) { - sd_print_result(sdkp, "Start/Stop Unit failed", res); - if (res > 0 && scsi_sense_valid(&sshdr)) { - sd_print_sense_hdr(sdkp, &sshdr); - /* 0x3a is medium not present */ - if (sshdr.asc == 0x3a) - res = 0; - } - } + /* Wait until processing of sense data has finished. */ + flush_work(&sdkp->start_done_work); - /* SCSI error codes must not go to the generic layer */ - if (res) - return -EIO; - - return 0; + return sd_submit_start(sdkp, cmd, sizeof(cmd)); } /* @@ -3644,6 +3685,8 @@ static void sd_shutdown(struct device *dev) sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); sd_start_stop_device(sdkp, 0); } + + flush_work(&sdkp->start_done_work); } static int sd_suspend_common(struct device *dev, bool ignore_stop_errors) diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h index 5eea762f84d1..b89187761d61 100644 --- a/drivers/scsi/sd.h +++ b/drivers/scsi/sd.h @@ -150,6 +150,11 @@ struct scsi_disk { unsigned urswrz : 1; unsigned security : 1; unsigned ignore_medium_access_errors : 1; + + int start_result; + u32 start_sense_len; + u8 start_sense_buffer[SCSI_SENSE_BUFFERSIZE]; + struct work_struct start_done_work; }; #define to_scsi_disk(obj) container_of(obj, struct scsi_disk, disk_dev)