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 X-Spam-Level: X-Spam-Status: No, score=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 8A2B4C432C0 for ; Thu, 21 Nov 2019 22:09:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4BCA2206CB for ; Thu, 21 Nov 2019 22:09:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726540AbfKUWJL (ORCPT ); Thu, 21 Nov 2019 17:09:11 -0500 Received: from mail-pl1-f195.google.com ([209.85.214.195]:45813 "EHLO mail-pl1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726297AbfKUWJK (ORCPT ); Thu, 21 Nov 2019 17:09:10 -0500 Received: by mail-pl1-f195.google.com with SMTP id w7so2196582plz.12 for ; Thu, 21 Nov 2019 14:09:10 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=zcFeLGaC0kZuLZi8us1AZWM4bS28wziNMRfKkCINacI=; b=jUF5g8k2huR/SCHLnX7/3e5B4k382uuxoRN/4Wmq2t+76vipdqiArIna0I2C6UP2Xz 0224kRDDuQ6tGkW7IO2CKlmw0Thc4Bz25kO5rJL0OIo18+jvnB29Ic4HrZMJRf1RbALT mzGw4tAX7gdn8cVBEtWrTXP7mCVXfGvQnkxV6NgU/2hxm4SOwp4yO8IZ7CSLgf/vqZsM 0KiW3w0V0KGdR22kt1FrFU7cjRX2h+67LRAUc6wIxeKF/1XJuiS+jZZi3J0p4Yw1mR0j 8rR/2shUjHOhCuKxDptmuikCOp5A2mgOUnfsowNUbODp4un2/6/OM8GOD5PE7QkL6Gq0 I8qA== X-Gm-Message-State: APjAAAXsTzJqZ1WDoAQTIZDqg5pcn5EYF3IB3LxertwczHpNUwoawqMm PHI33Iz4pC9xxz7jdTjnBZ0= X-Google-Smtp-Source: APXvYqwdMgkPgLjytpuFBRcbUN/GIL7JmTDWoA4JSbvpGRyPC6QoYZQFzI64vT8cT1PC96WoPVa2ug== X-Received: by 2002:a17:902:848a:: with SMTP id c10mr5066711plo.209.1574374149648; Thu, 21 Nov 2019 14:09:09 -0800 (PST) Received: from desktop-bart.svl.corp.google.com ([2620:15c:2cd:202:4308:52a3:24b6:2c60]) by smtp.gmail.com with ESMTPSA id m15sm4617714pfh.19.2019.11.21.14.09.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Nov 2019 14:09:08 -0800 (PST) From: Bart Van Assche To: "Martin K . Petersen" , "James E . J . Bottomley" Cc: Bean Huo , Avri Altman , Asutosh Das , Vignesh Raghavendra , Can Guo , linux-scsi@vger.kernel.org, Bart Van Assche , Stanley Chu , Tomas Winkler Subject: [PATCH v6 2/4] ufs: Avoid busy-waiting by eliminating tag conflicts Date: Thu, 21 Nov 2019 14:08:48 -0800 Message-Id: <20191121220850.16195-3-bvanassche@acm.org> X-Mailer: git-send-email 2.24.0.432.g9d3f5f5b63-goog In-Reply-To: <20191121220850.16195-1-bvanassche@acm.org> References: <20191121220850.16195-1-bvanassche@acm.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Instead of tracking which tags are in use in the ufs_hba.lrb_in_use bitmask, rely on the block layer tag allocation mechanism. This patch removes the following busy-waiting loop if ufshcd_issue_devman_upiu_cmd() and the block layer accidentally allocate the same tag for a SCSI request: * ufshcd_queuecommand() returns SCSI_MLQUEUE_HOST_BUSY. * The SCSI core requeues the SCSI command. Tested-by: Bean Huo Reviewed-by: Avri Altman Cc: Can Guo Cc: Stanley Chu Cc: Avri Altman Cc: Tomas Winkler Signed-off-by: Bart Van Assche --- drivers/scsi/ufs/ufshcd.c | 121 +++++++++++++++----------------------- drivers/scsi/ufs/ufshcd.h | 6 +- 2 files changed, 50 insertions(+), 77 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index deca1538e184..7b3649111b4e 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -497,8 +497,8 @@ static void ufshcd_print_tmrs(struct ufs_hba *hba, unsigned long bitmap) static void ufshcd_print_host_state(struct ufs_hba *hba) { dev_err(hba->dev, "UFS Host state=%d\n", hba->ufshcd_state); - dev_err(hba->dev, "lrb in use=0x%lx, outstanding reqs=0x%lx tasks=0x%lx\n", - hba->lrb_in_use, hba->outstanding_reqs, hba->outstanding_tasks); + dev_err(hba->dev, "outstanding reqs=0x%lx tasks=0x%lx\n", + hba->outstanding_reqs, hba->outstanding_tasks); dev_err(hba->dev, "saved_err=0x%x, saved_uic_err=0x%x\n", hba->saved_err, hba->saved_uic_err); dev_err(hba->dev, "Device power mode=%d, UIC link state=%d\n", @@ -1273,6 +1273,24 @@ static int ufshcd_devfreq_target(struct device *dev, return ret; } +static bool ufshcd_is_busy(struct request *req, void *priv, bool reserved) +{ + int *busy = priv; + + WARN_ON_ONCE(reserved); + (*busy)++; + return false; +} + +/* Whether or not any tag is in use by a request that is in progress. */ +static bool ufshcd_any_tag_in_use(struct ufs_hba *hba) +{ + struct request_queue *q = hba->cmd_queue; + int busy = 0; + + blk_mq_tagset_busy_iter(q->tag_set, ufshcd_is_busy, &busy); + return busy; +} static int ufshcd_devfreq_get_dev_status(struct device *dev, struct devfreq_dev_status *stat) @@ -1619,7 +1637,7 @@ static void ufshcd_gate_work(struct work_struct *work) if (hba->clk_gating.active_reqs || hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL - || hba->lrb_in_use || hba->outstanding_tasks + || ufshcd_any_tag_in_use(hba) || hba->outstanding_tasks || hba->active_uic_cmd || hba->uic_async_done) goto rel_lock; @@ -1673,7 +1691,7 @@ static void __ufshcd_release(struct ufs_hba *hba) if (hba->clk_gating.active_reqs || hba->clk_gating.is_suspended || hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL - || hba->lrb_in_use || hba->outstanding_tasks + || ufshcd_any_tag_in_use(hba) || hba->outstanding_tasks || hba->active_uic_cmd || hba->uic_async_done || ufshcd_eh_in_progress(hba)) return; @@ -2443,22 +2461,9 @@ static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd) hba->req_abort_count = 0; - /* acquire the tag to make sure device cmds don't use it */ - if (test_and_set_bit_lock(tag, &hba->lrb_in_use)) { - /* - * Dev manage command in progress, requeue the command. - * Requeuing the command helps in cases where the request *may* - * find different tag instead of waiting for dev manage command - * completion. - */ - err = SCSI_MLQUEUE_HOST_BUSY; - goto out; - } - err = ufshcd_hold(hba, true); if (err) { err = SCSI_MLQUEUE_HOST_BUSY; - clear_bit_unlock(tag, &hba->lrb_in_use); goto out; } WARN_ON(hba->clk_gating.state != CLKS_ON); @@ -2479,7 +2484,6 @@ static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd) err = ufshcd_map_sg(hba, lrbp); if (err) { lrbp->cmd = NULL; - clear_bit_unlock(tag, &hba->lrb_in_use); goto out; } /* Make sure descriptors are ready before ringing the doorbell */ @@ -2626,44 +2630,6 @@ static int ufshcd_wait_for_dev_cmd(struct ufs_hba *hba, return err; } -/** - * ufshcd_get_dev_cmd_tag - Get device management command tag - * @hba: per-adapter instance - * @tag_out: pointer to variable with available slot value - * - * Get a free slot and lock it until device management command - * completes. - * - * Returns false if free slot is unavailable for locking, else - * return true with tag value in @tag. - */ -static bool ufshcd_get_dev_cmd_tag(struct ufs_hba *hba, int *tag_out) -{ - int tag; - bool ret = false; - unsigned long tmp; - - if (!tag_out) - goto out; - - do { - tmp = ~hba->lrb_in_use; - tag = find_last_bit(&tmp, hba->nutrs); - if (tag >= hba->nutrs) - goto out; - } while (test_and_set_bit_lock(tag, &hba->lrb_in_use)); - - *tag_out = tag; - ret = true; -out: - return ret; -} - -static inline void ufshcd_put_dev_cmd_tag(struct ufs_hba *hba, int tag) -{ - clear_bit_unlock(tag, &hba->lrb_in_use); -} - /** * ufshcd_exec_dev_cmd - API for sending device management requests * @hba: UFS hba @@ -2676,6 +2642,8 @@ static inline void ufshcd_put_dev_cmd_tag(struct ufs_hba *hba, int tag) static int ufshcd_exec_dev_cmd(struct ufs_hba *hba, enum dev_cmd_type cmd_type, int timeout) { + struct request_queue *q = hba->cmd_queue; + struct request *req; struct ufshcd_lrb *lrbp; int err; int tag; @@ -2689,7 +2657,11 @@ static int ufshcd_exec_dev_cmd(struct ufs_hba *hba, * Even though we use wait_event() which sleeps indefinitely, * the maximum wait time is bounded by SCSI request timeout. */ - wait_event(hba->dev_cmd.tag_wq, ufshcd_get_dev_cmd_tag(hba, &tag)); + req = blk_get_request(q, REQ_OP_DRV_OUT, 0); + if (IS_ERR(req)) + return PTR_ERR(req); + tag = req->tag; + WARN_ON_ONCE(!ufshcd_valid_tag(hba, tag)); init_completion(&wait); lrbp = &hba->lrb[tag]; @@ -2714,8 +2686,7 @@ static int ufshcd_exec_dev_cmd(struct ufs_hba *hba, err ? "query_complete_err" : "query_complete"); out_put_tag: - ufshcd_put_dev_cmd_tag(hba, tag); - wake_up(&hba->dev_cmd.tag_wq); + blk_put_request(req); up_read(&hba->clk_scaling_lock); return err; } @@ -4856,7 +4827,6 @@ static void __ufshcd_transfer_req_compl(struct ufs_hba *hba, cmd->result = result; /* Mark completed command as NULL in LRB */ lrbp->cmd = NULL; - clear_bit_unlock(index, &hba->lrb_in_use); /* Do not touch lrbp after scsi done */ cmd->scsi_done(cmd); __ufshcd_release(hba); @@ -4878,9 +4848,6 @@ static void __ufshcd_transfer_req_compl(struct ufs_hba *hba, hba->outstanding_reqs ^= completed_reqs; ufshcd_clk_scaling_update_busy(hba); - - /* we might have free'd some tags above */ - wake_up(&hba->dev_cmd.tag_wq); } /** @@ -5876,6 +5843,8 @@ static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba, enum dev_cmd_type cmd_type, enum query_opcode desc_op) { + struct request_queue *q = hba->cmd_queue; + struct request *req; struct ufshcd_lrb *lrbp; int err = 0; int tag; @@ -5885,7 +5854,11 @@ static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba, down_read(&hba->clk_scaling_lock); - wait_event(hba->dev_cmd.tag_wq, ufshcd_get_dev_cmd_tag(hba, &tag)); + req = blk_get_request(q, REQ_OP_DRV_OUT, 0); + if (IS_ERR(req)) + return PTR_ERR(req); + tag = req->tag; + WARN_ON_ONCE(!ufshcd_valid_tag(hba, tag)); init_completion(&wait); lrbp = &hba->lrb[tag]; @@ -5961,8 +5934,7 @@ static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba, } } - ufshcd_put_dev_cmd_tag(hba, tag); - wake_up(&hba->dev_cmd.tag_wq); + blk_put_request(req); up_read(&hba->clk_scaling_lock); return err; } @@ -6257,9 +6229,6 @@ static int ufshcd_abort(struct scsi_cmnd *cmd) hba->lrb[tag].cmd = NULL; spin_unlock_irqrestore(host->host_lock, flags); - clear_bit_unlock(tag, &hba->lrb_in_use); - wake_up(&hba->dev_cmd.tag_wq); - out: if (!err) { err = SUCCESS; @@ -8263,6 +8232,7 @@ void ufshcd_remove(struct ufs_hba *hba) { ufs_bsg_remove(hba); ufs_sysfs_remove_nodes(hba->dev); + blk_cleanup_queue(hba->cmd_queue); scsi_remove_host(hba->host); /* disable interrupts */ ufshcd_disable_intr(hba, hba->intr_mask); @@ -8426,9 +8396,6 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq) init_rwsem(&hba->clk_scaling_lock); - /* Initialize device management tag acquire wait queue */ - init_waitqueue_head(&hba->dev_cmd.tag_wq); - ufshcd_init_clk_gating(hba); ufshcd_init_clk_scaling(hba); @@ -8462,6 +8429,12 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq) goto exit_gating; } + hba->cmd_queue = blk_mq_init_queue(&hba->host->tag_set); + if (IS_ERR(hba->cmd_queue)) { + err = PTR_ERR(hba->cmd_queue); + goto out_remove_scsi_host; + } + /* Reset the attached device */ ufshcd_vops_device_reset(hba); @@ -8471,7 +8444,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq) dev_err(hba->dev, "Host controller enable failed\n"); ufshcd_print_host_regs(hba); ufshcd_print_host_state(hba); - goto out_remove_scsi_host; + goto free_cmd_queue; } /* @@ -8508,6 +8481,8 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq) return 0; +free_cmd_queue: + blk_cleanup_queue(hba->cmd_queue); out_remove_scsi_host: scsi_remove_host(hba->host); exit_gating: diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 2740f6941ec6..56b9da6db1cc 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -212,13 +212,11 @@ struct ufs_query { * @type: device management command type - Query, NOP OUT * @lock: lock to allow one command at a time * @complete: internal commands completion - * @tag_wq: wait queue until free command slot is available */ struct ufs_dev_cmd { enum dev_cmd_type type; struct mutex lock; struct completion *complete; - wait_queue_head_t tag_wq; struct ufs_query query; }; @@ -483,7 +481,7 @@ struct ufs_stats { * @host: Scsi_Host instance of the driver * @dev: device handle * @lrb: local reference block - * @lrb_in_use: lrb in use + * @cmd_queue: Used to allocate command tags from hba->host->tag_set. * @outstanding_tasks: Bits representing outstanding task requests * @outstanding_reqs: Bits representing outstanding transfer requests * @capabilities: UFS Controller Capabilities @@ -541,6 +539,7 @@ struct ufs_hba { struct Scsi_Host *host; struct device *dev; + struct request_queue *cmd_queue; /* * This field is to keep a reference to "scsi_device" corresponding to * "UFS device" W-LU. @@ -561,7 +560,6 @@ struct ufs_hba { u32 ahit; struct ufshcd_lrb *lrb; - unsigned long lrb_in_use; unsigned long outstanding_tasks; unsigned long outstanding_reqs;