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Tue, 7 Jan 2020 17:58:12 +0900 (KST) Received: from localhost.localdomain (unknown [10.113.221.102]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20200107085812epsmtip2edf435cc31e434fe580e701db94c97c3~njw-T6jXc2461724617epsmtip2k; Tue, 7 Jan 2020 08:58:12 +0000 (GMT) From: Chanwoo Choi To: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: leonard.crestez@nxp.com, lukasz.luba@arm.com, a.swigon@samsung.com, m.szyprowski@samsung.com, enric.balletbo@collabora.com, hl@rock-chips.com, digetx@gmail.com, bjorn.andersson@linaro.org, jcrouse@codeaurora.org, cw00.choi@samsung.com, chanwoo@kernel.org, myungjoo.ham@samsung.com, kyungmin.park@samsung.com Subject: [PATCH 1/2] PM / devfreq: Add debugfs support with devfreq_summary file Date: Tue, 7 Jan 2020 18:05:18 +0900 Message-Id: <20200107090519.3231-2-cw00.choi@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200107090519.3231-1-cw00.choi@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrJJsWRmVeSWpSXmKPExsWy7bCmnq6qh0icwYFvQhb357UyWpze/47F YuKNKywW1788Z7VY/fExo8Wa24cYLX5sOMVssXFBtsXZpjfsFivufmS1uLxrDpvF594jjBYL m1rYLdYeuctucbtxBZsDv8eaeWsYPS739TJ57Li7hNFj56y77B6bVnWyedy5tofNY+O7HUwe f2ftZ/Ho27KK0ePzJrkArqhsm4zUxJTUIoXUvOT8lMy8dFsl7+B453hTMwNDXUNLC3MlhbzE 3FRbJRefAF23zBygN5QUyhJzSoFCAYnFxUr6djZF+aUlqQoZ+cUltkqpBSk5BZYFesWJucWl eel6yfm5VoYGBkamQIUJ2Rknmx6wFXSaVJxZuJ6pgbFJrYuRk0NCwETi2MWlrF2MXBxCAjsY JRad3scCkhAS+MQosaktGCLxjVFiXv8BFpiOhzvmM0IU7WWUuD6jFqLoC6PEyQ/r2UESbAJa Evtf3GADsUUErCRO/+9gBiliFtjPJDHh51tmkISwQJDEyskLwSaxCKhKbHn/BizOK2ApMWnx Oqht8hKrNxwAi3MCDfry+j07yCAJgf9sEpf+7oIqcpFoPPwdyhaWeHV8CzuELSXx+d1eNgi7 WmLlySNsEM0djBJb9l9ghUgYS+xfOpmpi5ED6DxNifW79CHCihI7f88FO45ZgE/i3dceVpAS CQFeiY42IYgSZYnLD+4yQdiSEovbO6FWeUjMfHeUFRJCvYwSPc+CJzDKzUJYsICRcRWjWGpB cW56arFhgSFyjG1iBCdTLdMdjFPO+RxiFOBgVOLhnSAjHCfEmlhWXJl7iFGCg1lJhFdLRyRO iDclsbIqtSg/vqg0J7X4EKMpMCQnMkuJJucDE31eSbyhqZGxsbGFiaGZqaGhkjgvx4+LsUIC 6YklqdmpqQWpRTB9TBycUg2Mob26KwtNDy8K+vvxGZdbzDIOkeX/41lOBe6SmKLjEbfKuNvt ZuWei5KNj5P/7ti87Y0ml4hVzRKFvUsefFDetnClk3r7SkkL9nsb1Mp/ad8rWBeVfuIQy2/1 MDu3PSfZV598bHPFf35Mn/fFerHgnthTr2syxV7a2Kz7WMFrMlFSyfOHRv5nJZbijERDLeai 4kQA29Yo07wDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrCLMWRmVeSWpSXmKPExsWy7bCSvK6Kh0icwdl+HYv781oZLU7vf8di MfHGFRaL61+es1qs/viY0WLN7UOMFj82nGK22Lgg2+Js0xt2ixV3P7JaXN41h83ic+8RRouF TS3sFmuP3GW3uN24gs2B32PNvDWMHpf7epk8dtxdwuixc9Zddo9NqzrZPO5c28PmsfHdDiaP v7P2s3j0bVnF6PF5k1wAVxSXTUpqTmZZapG+XQJXxsmmB2wFnSYVZxauZ2pgbFLrYuTkkBAw kXi4Yz5jFyMXh5DAbkaJ8+9vsEEkJCWmXTzK3MXIAWQLSxw+XAxR84lR4tyRXSwgNWwCWhL7 X0DUiwjYSNxdfI0FpIhZ4DyTRPvyqYwgCWGBAImD/88zgdgsAqoSW96/YQaxeQUsJSYtXscC sUxeYvWGA2BxTgEriS+v37OD2EJANWu2XmCcwMi3gJFhFaNkakFxbnpusWGBYV5quV5xYm5x aV66XnJ+7iZGcNhrae5gvLwk/hCjAAejEg+vhZRwnBBrYllxZe4hRgkOZiURXi0dkTgh3pTE yqrUovz4otKc1OJDjNIcLErivE/zjkUKCaQnlqRmp6YWpBbBZJk4OKUaGJkrzly/fKJCRUlz csjKnML3LmZ1MkUr2CzOKbRPPj9x0eZfWoYOE/Z+PfnPcrHL1SmMnsenOCjJczBPmRx07Wuv PDvre7GO9FvZG/iaH6/gSo3U19ua9jW77vAM0Q5febNn4Vd5s1+J1tmdrvXT/rWjRzls5lrb iYubl+/+W+zwu+v+599JxUosxRmJhlrMRcWJAGBQqV13AgAA X-CMS-MailID: 20200107085812epcas1p12121f8ef6492ed78053dea4977216788 X-Msg-Generator: CA X-Sendblock-Type: SVC_REQ_APPROVE CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20200107085812epcas1p12121f8ef6492ed78053dea4977216788 References: <20200107090519.3231-1-cw00.choi@samsung.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Add debugfs interface to provide debugging information of devfreq device. It contains 'devfreq_summary' entry to show the summary of registered devfreq devices as following and the additional debugfs file will be added. - /sys/kernel/debug/devfreq/devfreq_summary [Detailed description of each field of 'devfreq_summary' debugfs file] - dev_name : Device name of h/w. - dev : Device name made by devfreq core. - parent_dev : If devfreq device uses the passive governor, show parent devfreq device name. - governor : Devfreq governor. - polling_ms : If devfreq device uses the simple_ondemand governor, polling_ms is necessary for the period. (unit: millisecond) - cur_freq_hz : Current Frequency (unit: hz) - old_freq_hz : Frequency before changing. (unit: hz) - new_freq_hz : Frequency after changed. (unit: hz) [For example on Exynos5422-based Odroid-XU3 board] - In order to show the multiple governors on devfreq_summay result, change the governor of devfreq0 from simple_ondemand to userspace. $ cat /sys/kernel/debug/devfreq/devfreq_summary dev_name dev parent_dev governor polling_ms cur_freq_hz min_freq_hz max_freq_hz ------------------------------ ---------- ---------- --------------- ---------- ------------ ------------ ------------ 10c20000.memory-controller devfreq0 userspace 0 206000000 165000000 825000000 soc:bus_wcore devfreq1 simple_ondemand 50 532000000 88700000 532000000 soc:bus_noc devfreq2 devfreq1 passive 0 111000000 66600000 111000000 soc:bus_fsys_apb devfreq3 devfreq1 passive 0 222000000 111000000 222000000 soc:bus_fsys devfreq4 devfreq1 passive 0 200000000 75000000 200000000 soc:bus_fsys2 devfreq5 devfreq1 passive 0 200000000 75000000 200000000 soc:bus_mfc devfreq6 devfreq1 passive 0 333000000 83250000 333000000 soc:bus_gen devfreq7 devfreq1 passive 0 266000000 88700000 266000000 soc:bus_peri devfreq8 devfreq1 passive 0 66600000 66600000 66600000 soc:bus_g2d devfreq9 devfreq1 passive 0 0 83250000 333000000 soc:bus_g2d_acp devfreq10 devfreq1 passive 0 0 66500000 266000000 soc:bus_jpeg devfreq11 devfreq1 passive 0 0 75000000 300000000 soc:bus_jpeg_apb devfreq12 devfreq1 passive 0 0 83250000 166500000 soc:bus_disp1_fimd devfreq13 devfreq1 passive 0 0 120000000 200000000 soc:bus_disp1 devfreq14 devfreq1 passive 0 0 120000000 300000000 soc:bus_gscl_scaler devfreq15 devfreq1 passive 0 0 150000000 300000000 soc:bus_mscl devfreq16 devfreq1 passive 0 0 84000000 666000000 Reported-by: kbuild test robot Signed-off-by: Chanwoo Choi --- drivers/devfreq/devfreq.c | 80 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 80 insertions(+) diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 254f11b31824..c7f5e4e06420 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include #include @@ -33,6 +34,7 @@ #define HZ_PER_KHZ 1000 static struct class *devfreq_class; +static struct dentry *devfreq_debugfs; /* * devfreq core provides delayed work based load monitoring helper @@ -1717,6 +1719,74 @@ static struct attribute *devfreq_attrs[] = { }; ATTRIBUTE_GROUPS(devfreq); +/** + * devfreq_summary_show() - Show the summary of the registered devfreq devices + * via 'devfreq_summary' debugfs file. + */ +static int devfreq_summary_show(struct seq_file *s, void *data) +{ + struct devfreq *devfreq; + struct devfreq *p_devfreq = NULL; + unsigned long cur_freq, min_freq, max_freq; + unsigned int polling_ms; + + seq_printf(s, "%-30s %-10s %-10s %-15s %-10s %-12s %-12s %-12s\n", + "dev_name", + "dev", + "parent_dev", + "governor", + "polling_ms", + "cur_freq_hz", + "min_freq_hz", + "max_freq_hz"); + seq_printf(s, "%-30s %-10s %-10s %-15s %-10s %-12s %-12s %-12s\n", + "------------------------------", + "----------", + "----------", + "---------------", + "----------", + "------------", + "------------", + "------------"); + + mutex_lock(&devfreq_list_lock); + + list_for_each_entry_reverse(devfreq, &devfreq_list, node) { +#if IS_ENABLED(CONFIG_DEVFREQ_GOV_PASSIVE) + if (!strncmp(devfreq->governor_name, DEVFREQ_GOV_PASSIVE, + DEVFREQ_NAME_LEN)) { + struct devfreq_passive_data *data = devfreq->data; + + if (data) + p_devfreq = data->parent; + } else { + p_devfreq = NULL; + } +#endif + mutex_lock(&devfreq->lock); + cur_freq = devfreq->previous_freq, + get_freq_range(devfreq, &min_freq, &max_freq); + polling_ms = devfreq->profile->polling_ms, + mutex_unlock(&devfreq->lock); + + seq_printf(s, + "%-30s %-10s %-10s %-15s %-10d %-12ld %-12ld %-12ld\n", + dev_name(devfreq->dev.parent), + dev_name(&devfreq->dev), + p_devfreq ? dev_name(&p_devfreq->dev) : "", + devfreq->governor_name, + polling_ms, + cur_freq, + min_freq, + max_freq); + } + + mutex_unlock(&devfreq_list_lock); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(devfreq_summary); + static int __init devfreq_init(void) { devfreq_class = class_create(THIS_MODULE, "devfreq"); @@ -1733,6 +1803,16 @@ static int __init devfreq_init(void) } devfreq_class->dev_groups = devfreq_groups; + devfreq_debugfs = debugfs_create_dir("devfreq", NULL); + if (PTR_ERR(devfreq_debugfs) != -ENODEV && IS_ERR(devfreq_debugfs)) { + devfreq_debugfs = NULL; + pr_warn("%s: couldn't create debugfs dir\n", __FILE__); + } else { + debugfs_create_file("devfreq_summary", 0444, + devfreq_debugfs, NULL, + &devfreq_summary_fops); + } + return 0; } subsys_initcall(devfreq_init);