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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 88842C433F5 for ; Thu, 9 Sep 2021 22:26:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 73E186103D for ; Thu, 9 Sep 2021 22:26:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348438AbhIIW1M (ORCPT ); Thu, 9 Sep 2021 18:27:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40794 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345349AbhIIW0h (ORCPT ); Thu, 9 Sep 2021 18:26:37 -0400 Received: from mail-ot1-x333.google.com (mail-ot1-x333.google.com [IPv6:2607:f8b0:4864:20::333]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D69AFC061575; Thu, 9 Sep 2021 15:25:27 -0700 (PDT) Received: by mail-ot1-x333.google.com with SMTP id m7-20020a9d4c87000000b0051875f56b95so4565999otf.6; Thu, 09 Sep 2021 15:25:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ZLOPme3bTnjA2h6AchbcXlnzuUCG5BQ91CmIdjqTch4=; b=LtponteebQeI+Jw8nG5IkAAZtIy0uuRsADT1LEelc7mhkRfU6dT4xN/bTUpevL3O3R BUQHn2ij7mY2Y/IWgVEwZVuWG4NKHF75At+3ly4UbWR74ZfI4BpVcSUWYxL+zJiZq+f0 uWBRlSLoTsMHO9eRvv398Qpzh285jIA2kmc0isMnuMyjeyAZJWbdQuRwPRLgSy35RRYA HK3aa/7rXYBAHod21AFUAWMfqgEQvCC4eGCLsWN4upLOWVKlubmOWDtgvDvYTvJJepQm CvuWltVSJczZMdzd4dU6Rrmh3FdKHUpkn3zBN4OL3nxLZyx2pzIYPO17XGDkf+kGTXDE HWSA== 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=ZLOPme3bTnjA2h6AchbcXlnzuUCG5BQ91CmIdjqTch4=; b=AvP6w2UVwCUG1YTnxF/WJQYHNComzhgkUbzbvGPKBBUTil2sa8AvPDcD2Em532JNvM qRsM7HBolhR9TnuQtKiXZgUL+jJjTqhADx1ieUy9kEiFUVmixjKZvebZxJmxIINSjZht wJOamRWsLc6FW0N23VKEHTNkQVUq9Tb0ul6q5r139gpGtclpq5t25dn/CZVLDHZMfyA1 YGwUqUF/b2VHVDWNaL+UqyMiLROHOznEqP5xcnhEc8mWdIPtQ1QnX88P+PmXUCD26/X5 kBxfZRQKlF6VbzQOc6WUEGqIM4TAlb6dldY0i1px7nIrxwGh4RJyNe5AkGn4w4D9HKLv 7yow== X-Gm-Message-State: AOAM531ZB5Z3YNBdDiivdb+rPf2xf92iH44AJDSytlz1Hrz8pqlDQ1AQ hg0506cwqSjZQTi5JBUEg1Y= X-Google-Smtp-Source: ABdhPJymhcAar4MC37SQkwoGEHEL+ZOu0WpDW4mlRmyEcb8UmY18fPxgWhceTeD9mVthrLwBuYE/4Q== X-Received: by 2002:a9d:4910:: with SMTP id e16mr1893390otf.170.1631226327264; Thu, 09 Sep 2021 15:25:27 -0700 (PDT) Received: from ian.penurio.us ([47.184.51.90]) by smtp.gmail.com with ESMTPSA id 4sm747293oil.38.2021.09.09.15.25.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Sep 2021 15:25:26 -0700 (PDT) From: Ian Pilcher To: axboe@kernel.dk, pavel@ucw.cz Cc: linux-leds@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org, kabel@kernel.org Subject: [PATCH v2 09/15] leds: trigger: blkdev: Check devices for activity and blink LEDs Date: Thu, 9 Sep 2021 17:25:07 -0500 Message-Id: <20210909222513.2184795-10-arequipeno@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210909222513.2184795-1-arequipeno@gmail.com> References: <20210909222513.2184795-1-arequipeno@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Use a delayed workqueue to periodically check configured block devices for activity since the last check. Blink LEDs associated with devices on which the configured type of activity (read/write) has occurred. Signed-off-by: Ian Pilcher --- drivers/leds/trigger/ledtrig-blkdev.c | 103 ++++++++++++++++++++++++++ 1 file changed, 103 insertions(+) diff --git a/drivers/leds/trigger/ledtrig-blkdev.c b/drivers/leds/trigger/ledtrig-blkdev.c index 53b62e320491..40dc55e5d4f3 100644 --- a/drivers/leds/trigger/ledtrig-blkdev.c +++ b/drivers/leds/trigger/ledtrig-blkdev.c @@ -8,6 +8,7 @@ #include #include +#include #include "ledtrig-blkdev.h" @@ -60,6 +61,108 @@ struct ledtrig_blkdev_led { enum ledtrig_blkdev_mode mode; }; +/* All LEDs associated with the trigger */ +static HLIST_HEAD(ledtrig_blkdev_leds); + +/* How often to check for drive activity - in jiffies */ +static unsigned int ledtrig_blkdev_interval; + +/* Delayed work used to periodically check for activity & blink LEDs */ +static void blkdev_process(struct work_struct *const work); +static DECLARE_DELAYED_WORK(ledtrig_blkdev_work, blkdev_process); + + +/* + * + * Periodically check for device acitivity and blink LEDs + * + */ + +static void blkdev_blink(const struct ledtrig_blkdev_led *const led) +{ + unsigned long delay_on = READ_ONCE(led->blink_msec); + unsigned long delay_off = 1; /* 0 leaves LED turned on */ + + led_blink_set_oneshot(led->led_dev, &delay_on, &delay_off, 0); +} + +static void blkdev_update_disk(struct ledtrig_blkdev_disk *const disk, + const unsigned int generation) +{ + const struct block_device *const part0 = disk->gd->part0; + const unsigned long read_ios = part_stat_read(part0, ios[STAT_READ]); + const unsigned long write_ios = part_stat_read(part0, ios[STAT_WRITE]) + + part_stat_read(part0, ios[STAT_DISCARD]) + + part_stat_read(part0, ios[STAT_FLUSH]); + + if (disk->read_ios != read_ios) { + disk->read_act = true; + disk->read_ios = read_ios; + } else { + disk->read_act = false; + } + + if (disk->write_ios != write_ios) { + disk->write_act = true; + disk->write_ios = write_ios; + } else { + disk->write_act = false; + } + + disk->generation = generation; +} + +static bool blkdev_read_mode(const enum ledtrig_blkdev_mode mode) +{ + return mode != LEDTRIG_BLKDEV_MODE_WO; +} + +static bool blkdev_write_mode(const enum ledtrig_blkdev_mode mode) +{ + return mode != LEDTRIG_BLKDEV_MODE_RO; +} + +static void blkdev_process(struct work_struct *const work) +{ + static unsigned int generation; + + struct ledtrig_blkdev_led *led; + struct ledtrig_blkdev_link *link; + unsigned long delay; + + if (!mutex_trylock(&ledtrig_blkdev_mutex)) + goto exit_reschedule; + + hlist_for_each_entry(led, &ledtrig_blkdev_leds, leds_node) { + + hlist_for_each_entry(link, &led->disks, led_disks_node) { + + struct ledtrig_blkdev_disk *const disk = link->disk; + + if (disk->generation != generation) + blkdev_update_disk(disk, generation); + + if (disk->read_act && blkdev_read_mode(led->mode)) { + blkdev_blink(led); + break; + } + + if (disk->write_act && blkdev_write_mode(led->mode)) { + blkdev_blink(led); + break; + } + } + } + + ++generation; + + mutex_unlock(&ledtrig_blkdev_mutex); + +exit_reschedule: + delay = READ_ONCE(ledtrig_blkdev_interval); + WARN_ON_ONCE(!schedule_delayed_work(&ledtrig_blkdev_work, delay)); +} + /* * -- 2.31.1