From patchwork Thu May 4 07:31:31 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Omar Sandoval X-Patchwork-Id: 9710915 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 8C3D660362 for ; Thu, 4 May 2017 07:31:54 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7E23E28683 for ; Thu, 4 May 2017 07:31:54 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6F8A728682; Thu, 4 May 2017 07:31:54 +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=-6.4 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, RCVD_IN_DNSWL_HI, RCVD_IN_SORBS_SPAM 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 A75A228682 for ; Thu, 4 May 2017 07:31:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752609AbdEDHbx (ORCPT ); Thu, 4 May 2017 03:31:53 -0400 Received: from mail-pg0-f51.google.com ([74.125.83.51]:34172 "EHLO mail-pg0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752545AbdEDHbw (ORCPT ); Thu, 4 May 2017 03:31:52 -0400 Received: by mail-pg0-f51.google.com with SMTP id v1so4114262pgv.1 for ; Thu, 04 May 2017 00:31:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=osandov-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=71elvKMu4l/R5MBUzytIHOXu4pUkV2OnX9HYyh/gwWU=; b=ed4gM2T8vLsd36WjWRsvMUQGopn+p7iwZO/SWRwVe23DIpToAwsdtmpeZJsL4Qfg3M YWgzepsOW/LnWlSspTPycEzERvAS2cri1VDPATwLX3fbml/GNFN2RzDhAWJDAEeq4RIU LGt2nnszOQmfEMhL2U8wnw3FbuVkeSvkqm0y0jHPiZJ08QZDNqAtIRqjtwJy2Gtrw1DB GztaIAdtR/6MfYQ4UaZP2WXQ8l7vnH2w4HPOcopCxF16OZk+NgM2cvElNRYltm9QqsM8 5ztxnMwZHhQrcluj5Xk0CsRQqh1EW8dgj+FwqnZ1aFqoNSzdXgdV494pZ1BsUjqALUaS 48Pg== 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:in-reply-to:references; bh=71elvKMu4l/R5MBUzytIHOXu4pUkV2OnX9HYyh/gwWU=; b=BEtyicuHc+6pxzLhQE4MNVjWn5P8Wutb1En+Zc7LkpqstEMtXIj/91xk9U3VKT+SJB wpb2jzWsZTvpH7lkRr2bWgFIaU1M4TkAn0vSgXh63zXzhcgMhvRFr/KtVSuN0utmC8fv 7lngEJBdlbSNWR9EkIlWZ2o7pGINtvL3x/MNvbRBIbdBh19JxApsAXAbsY/PAoa9iQYs jJTS+xBgfPJBgbKSbn0y5Cdt+8uU6z96bGlwrBymkkr6ZzCI8tlfrq4RwGCg6nlkGDxZ 4c1AGqayhRe6/yAa4mycWnwbQFRhszTGYYO0518nCHEfaUJhwYUW5Wan2UwNuq3GX0QJ kJjg== X-Gm-Message-State: AN3rC/6wpvMnH8PYHQZHfYohqBXNa3raulP6YHfbKiTj5nVROAls50MT L/IHEhI65/ae3sW8yvLg7g== X-Received: by 10.98.19.12 with SMTP id b12mr9233992pfj.21.1493883111367; Thu, 04 May 2017 00:31:51 -0700 (PDT) Received: from vader.thefacebook.com ([2620:10d:c090:180::1:1d23]) by smtp.gmail.com with ESMTPSA id q6sm2272168pfq.18.2017.05.04.00.31.50 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 04 May 2017 00:31:50 -0700 (PDT) From: Omar Sandoval To: Jens Axboe , linux-block@vger.kernel.org Cc: Bart Van Assche , kernel-team@fb.com Subject: [PATCH v2 09/12] blk-mq: untangle debugfs and sysfs Date: Thu, 4 May 2017 00:31:31 -0700 Message-Id: <48cef16b7b8fbdbfd8686f828287370cdcb21650.1493882751.git.osandov@fb.com> X-Mailer: git-send-email 2.12.2 In-Reply-To: References: In-Reply-To: References: 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 From: Omar Sandoval Originally, I tied debugfs registration/unregistration together with sysfs. There's no reason to do this, and it's getting in the way of letting schedulers define their own debugfs attributes. Instead, tie the debugfs registration to the lifetime of the structures themselves. The saner lifetimes mean we can also get rid of the extra mq directory and move everything one level up. I.e., nvme0n1/mq/hctx0/tags is now just nvme0n1/hctx0/tags. Signed-off-by: Omar Sandoval --- block/blk-core.c | 9 +--- block/blk-mq-debugfs.c | 110 ++++++++++++++++++++++++++++--------------------- block/blk-mq-debugfs.h | 21 ++++++++-- block/blk-mq-sysfs.c | 11 ----- block/blk-mq.c | 7 ++++ block/blk-sysfs.c | 2 + include/linux/blk-mq.h | 4 ++ include/linux/blkdev.h | 1 - 8 files changed, 94 insertions(+), 71 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index acdca6536562..c580b0138a7f 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -40,7 +40,6 @@ #include "blk.h" #include "blk-mq.h" -#include "blk-mq-debugfs.h" #include "blk-mq-sched.h" #include "blk-wbt.h" @@ -562,13 +561,9 @@ void blk_cleanup_queue(struct request_queue *q) * prevent that q->request_fn() gets invoked after draining finished. */ blk_freeze_queue(q); - if (!q->mq_ops) { - spin_lock_irq(lock); + spin_lock_irq(lock); + if (!q->mq_ops) __blk_drain_queue(q, true); - } else { - blk_mq_debugfs_unregister_mq(q); - spin_lock_irq(lock); - } queue_flag_set(QUEUE_FLAG_DEAD, q); spin_unlock_irq(lock); diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c index 1dc1847b5363..260cf76e0705 100644 --- a/block/blk-mq-debugfs.c +++ b/block/blk-mq-debugfs.c @@ -687,19 +687,46 @@ static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { {}, }; +static bool debugfs_create_files(struct dentry *parent, void *data, + const struct blk_mq_debugfs_attr *attr) +{ + d_inode(parent)->i_private = data; + + for (; attr->name; attr++) { + if (!debugfs_create_file(attr->name, attr->mode, parent, + (void *)attr, &blk_mq_debugfs_fops)) + return false; + } + return true; +} + int blk_mq_debugfs_register(struct request_queue *q) { + struct blk_mq_hw_ctx *hctx; + int i; + if (!blk_debugfs_root) return -ENOENT; q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent), blk_debugfs_root); if (!q->debugfs_dir) - goto err; + return -ENOMEM; - if (blk_mq_debugfs_register_mq(q)) + if (!debugfs_create_files(q->debugfs_dir, q, + blk_mq_debugfs_queue_attrs)) goto err; + /* + * blk_mq_init_hctx() attempted to do this already, but q->debugfs_dir + * didn't exist yet (because we don't know what to name the directory + * until the queue is registered to a gendisk). + */ + queue_for_each_hw_ctx(q, hctx, i) { + if (!hctx->debugfs_dir && blk_mq_debugfs_register_hctx(q, hctx)) + goto err; + } + return 0; err: @@ -710,32 +737,17 @@ int blk_mq_debugfs_register(struct request_queue *q) void blk_mq_debugfs_unregister(struct request_queue *q) { debugfs_remove_recursive(q->debugfs_dir); - q->mq_debugfs_dir = NULL; q->debugfs_dir = NULL; } -static bool debugfs_create_files(struct dentry *parent, void *data, - const struct blk_mq_debugfs_attr *attr) -{ - d_inode(parent)->i_private = data; - - for (; attr->name; attr++) { - if (!debugfs_create_file(attr->name, attr->mode, parent, - (void *)attr, &blk_mq_debugfs_fops)) - return false; - } - return true; -} - -static int blk_mq_debugfs_register_ctx(struct request_queue *q, - struct blk_mq_ctx *ctx, - struct dentry *hctx_dir) +static int blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx, + struct blk_mq_ctx *ctx) { struct dentry *ctx_dir; char name[20]; snprintf(name, sizeof(name), "cpu%u", ctx->cpu); - ctx_dir = debugfs_create_dir(name, hctx_dir); + ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir); if (!ctx_dir) return -ENOMEM; @@ -745,59 +757,61 @@ static int blk_mq_debugfs_register_ctx(struct request_queue *q, return 0; } -static int blk_mq_debugfs_register_hctx(struct request_queue *q, - struct blk_mq_hw_ctx *hctx) +int blk_mq_debugfs_register_hctx(struct request_queue *q, + struct blk_mq_hw_ctx *hctx) { struct blk_mq_ctx *ctx; - struct dentry *hctx_dir; char name[20]; int i; + if (!q->debugfs_dir) + return -ENOENT; + snprintf(name, sizeof(name), "hctx%u", hctx->queue_num); - hctx_dir = debugfs_create_dir(name, q->mq_debugfs_dir); - if (!hctx_dir) + hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir); + if (!hctx->debugfs_dir) return -ENOMEM; - if (!debugfs_create_files(hctx_dir, hctx, blk_mq_debugfs_hctx_attrs)) - return -ENOMEM; + if (!debugfs_create_files(hctx->debugfs_dir, hctx, + blk_mq_debugfs_hctx_attrs)) + goto err; hctx_for_each_ctx(hctx, ctx, i) { - if (blk_mq_debugfs_register_ctx(q, ctx, hctx_dir)) - return -ENOMEM; + if (blk_mq_debugfs_register_ctx(hctx, ctx)) + goto err; } return 0; + +err: + blk_mq_debugfs_unregister_hctx(hctx); + return -ENOMEM; +} + +void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx) +{ + debugfs_remove_recursive(hctx->debugfs_dir); + hctx->debugfs_dir = NULL; } -int blk_mq_debugfs_register_mq(struct request_queue *q) +int blk_mq_debugfs_register_hctxs(struct request_queue *q) { struct blk_mq_hw_ctx *hctx; int i; - if (!q->debugfs_dir) - return -ENOENT; - - q->mq_debugfs_dir = debugfs_create_dir("mq", q->debugfs_dir); - if (!q->mq_debugfs_dir) - goto err; - - if (!debugfs_create_files(q->mq_debugfs_dir, q, blk_mq_debugfs_queue_attrs)) - goto err; - queue_for_each_hw_ctx(q, hctx, i) { if (blk_mq_debugfs_register_hctx(q, hctx)) - goto err; + return -ENOMEM; } return 0; - -err: - blk_mq_debugfs_unregister_mq(q); - return -ENOMEM; } -void blk_mq_debugfs_unregister_mq(struct request_queue *q) +void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) { - debugfs_remove_recursive(q->mq_debugfs_dir); - q->mq_debugfs_dir = NULL; + struct blk_mq_hw_ctx *hctx; + int i; + + queue_for_each_hw_ctx(q, hctx, i) + blk_mq_debugfs_unregister_hctx(hctx); } diff --git a/block/blk-mq-debugfs.h b/block/blk-mq-debugfs.h index 00b0f71d0ae9..596e9b16d3d1 100644 --- a/block/blk-mq-debugfs.h +++ b/block/blk-mq-debugfs.h @@ -4,8 +4,11 @@ #ifdef CONFIG_BLK_DEBUG_FS int blk_mq_debugfs_register(struct request_queue *q); void blk_mq_debugfs_unregister(struct request_queue *q); -int blk_mq_debugfs_register_mq(struct request_queue *q); -void blk_mq_debugfs_unregister_mq(struct request_queue *q); +int blk_mq_debugfs_register_hctx(struct request_queue *q, + struct blk_mq_hw_ctx *hctx); +void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx); +int blk_mq_debugfs_register_hctxs(struct request_queue *q); +void blk_mq_debugfs_unregister_hctxs(struct request_queue *q); #else static inline int blk_mq_debugfs_register(struct request_queue *q) { @@ -16,12 +19,22 @@ static inline void blk_mq_debugfs_unregister(struct request_queue *q) { } -static inline int blk_mq_debugfs_register_mq(struct request_queue *q) +static inline int blk_mq_debugfs_register_hctx(struct request_queue *q, + struct blk_mq_hw_ctx *hctx) { return 0; } -static inline void blk_mq_debugfs_unregister_mq(struct request_queue *q) +static inline void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx) +{ +} + +static inline int blk_mq_debugfs_register_hctxs(struct request_queue *q) +{ + return 0; +} + +static inline void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) { } #endif diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c index 71a237a90d43..79969c3c234f 100644 --- a/block/blk-mq-sysfs.c +++ b/block/blk-mq-sysfs.c @@ -11,7 +11,6 @@ #include #include "blk-mq.h" -#include "blk-mq-debugfs.h" #include "blk-mq-tag.h" static void blk_mq_sysfs_release(struct kobject *kobj) @@ -259,8 +258,6 @@ static void __blk_mq_unregister_dev(struct device *dev, struct request_queue *q) queue_for_each_hw_ctx(q, hctx, i) blk_mq_unregister_hctx(hctx); - blk_mq_debugfs_unregister_mq(q); - kobject_uevent(&q->mq_kobj, KOBJ_REMOVE); kobject_del(&q->mq_kobj); kobject_put(&dev->kobj); @@ -319,8 +316,6 @@ int __blk_mq_register_dev(struct device *dev, struct request_queue *q) kobject_uevent(&q->mq_kobj, KOBJ_ADD); - blk_mq_debugfs_register(q); - queue_for_each_hw_ctx(q, hctx, i) { ret = blk_mq_register_hctx(hctx); if (ret) @@ -336,8 +331,6 @@ int __blk_mq_register_dev(struct device *dev, struct request_queue *q) while (--i >= 0) blk_mq_unregister_hctx(q->queue_hw_ctx[i]); - blk_mq_debugfs_unregister_mq(q); - kobject_uevent(&q->mq_kobj, KOBJ_REMOVE); kobject_del(&q->mq_kobj); kobject_put(&dev->kobj); @@ -365,8 +358,6 @@ void blk_mq_sysfs_unregister(struct request_queue *q) if (!q->mq_sysfs_init_done) goto unlock; - blk_mq_debugfs_unregister_mq(q); - queue_for_each_hw_ctx(q, hctx, i) blk_mq_unregister_hctx(hctx); @@ -383,8 +374,6 @@ int blk_mq_sysfs_register(struct request_queue *q) if (!q->mq_sysfs_init_done) goto unlock; - blk_mq_debugfs_register_mq(q); - queue_for_each_hw_ctx(q, hctx, i) { ret = blk_mq_register_hctx(hctx); if (ret) diff --git a/block/blk-mq.c b/block/blk-mq.c index bf90684a007a..f54467a84d9a 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -31,6 +31,7 @@ #include #include "blk.h" #include "blk-mq.h" +#include "blk-mq-debugfs.h" #include "blk-mq-tag.h" #include "blk-stat.h" #include "blk-wbt.h" @@ -1851,6 +1852,8 @@ static void blk_mq_exit_hctx(struct request_queue *q, { unsigned flush_start_tag = set->queue_depth; + blk_mq_debugfs_unregister_hctx(hctx); + blk_mq_tag_idle(hctx); if (set->ops->exit_request) @@ -1941,6 +1944,8 @@ static int blk_mq_init_hctx(struct request_queue *q, if (hctx->flags & BLK_MQ_F_BLOCKING) init_srcu_struct(&hctx->queue_rq_srcu); + blk_mq_debugfs_register_hctx(q, hctx); + return 0; free_fq: @@ -2378,6 +2383,7 @@ static void blk_mq_queue_reinit(struct request_queue *q, { WARN_ON_ONCE(!atomic_read(&q->mq_freeze_depth)); + blk_mq_debugfs_unregister_hctxs(q); blk_mq_sysfs_unregister(q); /* @@ -2389,6 +2395,7 @@ static void blk_mq_queue_reinit(struct request_queue *q, blk_mq_map_swqueue(q, online_mask); blk_mq_sysfs_register(q); + blk_mq_debugfs_register_hctxs(q); } /* diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 9995355121d7..504fee940052 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -890,6 +890,8 @@ int blk_register_queue(struct gendisk *disk) if (q->mq_ops) __blk_mq_register_dev(dev, q); + blk_mq_debugfs_register(q); + kobject_uevent(&q->kobj, KOBJ_ADD); wbt_enable_default(q); diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index f3e5e1de1bdb..7c2fc881fe09 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -57,6 +57,10 @@ struct blk_mq_hw_ctx { unsigned long poll_considered; unsigned long poll_invoked; unsigned long poll_success; + +#ifdef CONFIG_BLK_DEBUG_FS + struct dentry *debugfs_dir; +#endif }; struct blk_mq_tag_set { diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 83d28623645f..b49a79a29e58 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -579,7 +579,6 @@ struct request_queue { #ifdef CONFIG_BLK_DEBUG_FS struct dentry *debugfs_dir; - struct dentry *mq_debugfs_dir; #endif bool mq_sysfs_init_done;