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Fri, 26 Jun 2020 10:01:10 +0000 (GMT) X-AuditID: cbfec7f5-371ff700000018ae-62-5ef5c766c33b Received: from eusmtip1.samsung.com ( [203.254.199.221]) by eusmgms2.samsung.com (EUCPMTA) with SMTP id C3.86.06017.567C5FE5; Fri, 26 Jun 2020 11:01:10 +0100 (BST) Received: from AMDC3748.digital.local (unknown [106.120.51.74]) by eusmtip1.samsung.com (KnoxPortal) with ESMTPA id 20200626100109eusmtip190f09b3306fb2cc99e90aff84181ad15~cD7w4Nr0M2485024850eusmtip1F; Fri, 26 Jun 2020 10:01:09 +0000 (GMT) From: Andrzej Hajda To: Greg Kroah-Hartman Subject: [PATCH v6 2/4] driver core: add deferring probe reason to devices_deferred property Date: Fri, 26 Jun 2020 12:01:01 +0200 Message-Id: <20200626100103.18879-3-a.hajda@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200626100103.18879-1-a.hajda@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0VSfUyMcRz3u+e553muOR7npu+6MGdsMmElPzLDSs8/zB9kWMfRo5q6y10v Slu3RbrSGxJHqxFa5OhtQqpD52WXihpX7bIyotaoY7Xz0uPJ/Pf5fj8v398++zGEwiH1YWJ0 CbxBp41VU15kfevEqxWH7W7NqmwrYOftNikeKniM8N0LVikuej9I4d/1hQR+4x6lcMZVK4W7 fgwR+PlwF4nNheU0rh7oluLX9y9T2FbUiHDVkz4a2/L24ZLxImITy73u7iC40bcnaa7xexnJ NVj6aO5S1kUpV11pprhnBZ0SrqnkFs25cuwSrqY8ncurrURcc+5ZkhurXrBDvtdrQyQfG5PE G1ZuPOAVnd3dQ8b3Lz72JdeJTOjb/GwkY4ANhMr+U2Q28mIUbAWCKxMZEnEYR+Dq6Z0exhBc eNhC/bOc85QjkbiBwNI5+d/ScfsDLagodhn8rHn316FkAyDfYaEFEcFOktB1KlMqEHNZDXQU X51yMwzJLoGGx37CWs5iGHBWIfHaQrh5p5kQsIxdB8XOXKmQA+wIDa6iB3+9wIaA2RIu6ufC Z3stLWJf+N1QKhFxOrgqThCiNwtB3Z0GQiSCobdtkhJyiKlHW++vFCM3w7WBIBHOgrcjcwQx MQXP1BcT4loOWZkKMWMRuBx103necK3dPV0VB2eyhBKEdk4jGBj+igrQQsv/W2UIVSJvPtEY F8UbA3R8sr9RG2dM1EX5H9LHVaOpT/byl919Dz3yHLQhlkHqmfLmwnGNQqpNMqbE2RAwhFop 3+J4qVHII7UpqbxBv9+QGMsbbUjFkGpvecCVoQgFG6VN4I/wfDxv+MdKGJmPCcmG604/cETl fLTPnnA2kYN7XoREDM7LDzNfClK684NCN7Wb14e16qmEArVq67C+NDDoU//OtJalyZHbU2Wu Nv38zWXbYHlaaPNqree6b+nRNRC2S3nZ7/hTPqRtRvjYbs9gTvxB5azwEkWSb4fphEsXnK4c Mp2PMKl2RRsMqrVq0hitXe1HGIzaP6XapvFgAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrPIsWRmVeSWpSXmKPExsVy+t/xu7ppx7/GGexoYbS4te4cq8XLCYcZ LTbOWM9qMfXhEzaL/9smMltc+fqezaJ58Xo2i6vfXzJbnHxzlcWic+ISdotNj6+xWlzeNYfN 4tDUvYwWa4/cZbc41BdtMffLVGYHAY/L1y4ye7y/0crusffbAhaPnbPusnvM7pjJ6rFpVSeb x4kJl5g89s9dw+5xv/s4k8fmJfUefVtWMXoc6J3M4vF5k1wAb5SeTVF+aUmqQkZ+cYmtUrSh hZGeoaWFnpGJpZ6hsXmslZGpkr6dTUpqTmZZapG+XYJeRte12ywFD5QrXvfeYmxg/CTbxcjJ ISFgIjHlzxLGLkYuDiGBpYwS3TubWSES4hK7579lhrCFJf5c62KDKPrEKPG2uwusiE1AU+Lv 5ptsILaIgLFE/9lZ7CBFzAJtrBJzzz9hB0kIC8RIvDvcA7SCg4NFQFVi52EtkDCvgIXE41tr GSEWyEus3nAAbBmngKXE9Fu9rCDlQkA1nUsiJzDyLWBkWMUoklpanJueW2ykV5yYW1yal66X nJ+7iREYWduO/dyyg7HrXfAhRgEORiUe3gMTv8QJsSaWFVfmHmKU4GBWEuF1Ons6Tog3JbGy KrUoP76oNCe1+BCjKdBJE5mlRJPzgVGfVxJvaGpobmFpaG5sbmxmoSTO2yFwMEZIID2xJDU7 NbUgtQimj4mDU6qBMeHQMhOjk2ES0hdvvFN64ZYnM1dN1feqWeyG3UXeImvdlI+4FJov107V fXiLy3jytpqfm/zeGLxOVfgZ9W5Z8IIfize9O23U+ueYknePfeZShlVLf3gt+yHGLf4uxDEx w3H/xJA7nx+tvLTgH2tEkOi1rze3CclFq7ikROZ+LVmQ+jJO58M3eSWW4oxEQy3mouJEABQO xHbCAgAA X-CMS-MailID: 20200626100110eucas1p2c5b91f2c98a5c6e5739f5af3207d192e X-Msg-Generator: CA X-RootMTR: 20200626100110eucas1p2c5b91f2c98a5c6e5739f5af3207d192e X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200626100110eucas1p2c5b91f2c98a5c6e5739f5af3207d192e References: <20200626100103.18879-1-a.hajda@samsung.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200626_110114_209984_20BD6298 X-CRM114-Status: GOOD ( 22.59 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jernej Skrabec , "Rafael J. Wysocki" , Jonas Karlman , Bartlomiej Zolnierkiewicz , linux-kernel@vger.kernel.org, "open list:DRM DRIVERS" , Russell King - ARM Linux , Neil Armstrong , Andrzej Hajda , andy.shevchenko@gmail.com, Mark Brown , Laurent Pinchart , Daniel Vetter , linux-arm-kernel@lists.infradead.org, Marek Szyprowski MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org /sys/kernel/debug/devices_deferred property contains list of deferred devices. This list does not contain reason why the driver deferred probe, the patch improves it. The natural place to set the reason is probe_err function introduced recently, ie. if probe_err will be called with -EPROBE_DEFER instead of printk the message will be attached to deferred device and printed when user read devices_deferred property. Signed-off-by: Andrzej Hajda Reviewed-by: Mark Brown Reviewed-by: Javier Martinez Canillas Reviewed-by: Andy Shevchenko --- drivers/base/base.h | 3 +++ drivers/base/core.c | 8 ++++++-- drivers/base/dd.c | 23 ++++++++++++++++++++++- 3 files changed, 31 insertions(+), 3 deletions(-) diff --git a/drivers/base/base.h b/drivers/base/base.h index 95c22c0f9036..6954fccab3d7 100644 --- a/drivers/base/base.h +++ b/drivers/base/base.h @@ -93,6 +93,7 @@ struct device_private { struct klist_node knode_class; struct list_head deferred_probe; struct device_driver *async_driver; + char *deferred_probe_reason; struct device *device; u8 dead:1; }; @@ -134,6 +135,8 @@ extern void device_release_driver_internal(struct device *dev, extern void driver_detach(struct device_driver *drv); extern int driver_probe_device(struct device_driver *drv, struct device *dev); extern void driver_deferred_probe_del(struct device *dev); +extern void device_set_deferred_probe_reson(const struct device *dev, + struct va_format *vaf); static inline int driver_match_device(struct device_driver *drv, struct device *dev) { diff --git a/drivers/base/core.c b/drivers/base/core.c index 3a827c82933f..fee047f03681 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -3963,6 +3963,8 @@ define_dev_printk_level(_dev_info, KERN_INFO); * This helper implements common pattern present in probe functions for error * checking: print debug or error message depending if the error value is * -EPROBE_DEFER and propagate error upwards. + * In case of -EPROBE_DEFER it sets also defer probe reason, which can be + * checked later by reading devices_deferred debugfs attribute. * It replaces code sequence: * if (err != -EPROBE_DEFER) * dev_err(dev, ...); @@ -3984,10 +3986,12 @@ int dev_err_probe(const struct device *dev, int err, const char *fmt, ...) vaf.fmt = fmt; vaf.va = &args; - if (err != -EPROBE_DEFER) + if (err != -EPROBE_DEFER) { dev_err(dev, "error %d: %pV", err, &vaf); - else + } else { + device_set_deferred_probe_reson(dev, &vaf); dev_dbg(dev, "error %d: %pV", err, &vaf); + } va_end(args); diff --git a/drivers/base/dd.c b/drivers/base/dd.c index 9a1d940342ac..dd5683b61f74 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -27,6 +27,7 @@ #include #include #include +#include #include "base.h" #include "power/power.h" @@ -136,6 +137,8 @@ void driver_deferred_probe_del(struct device *dev) if (!list_empty(&dev->p->deferred_probe)) { dev_dbg(dev, "Removed from deferred list\n"); list_del_init(&dev->p->deferred_probe); + kfree(dev->p->deferred_probe_reason); + dev->p->deferred_probe_reason = NULL; } mutex_unlock(&deferred_probe_mutex); } @@ -211,6 +214,23 @@ void device_unblock_probing(void) driver_deferred_probe_trigger(); } +/** + * device_set_deferred_probe_reson() - Set defer probe reason message for device + * @dev: the pointer to the struct device + * @vaf: the pointer to va_format structure with message + */ +void device_set_deferred_probe_reson(const struct device *dev, struct va_format *vaf) +{ + const char *drv = dev_driver_string(dev); + + mutex_lock(&deferred_probe_mutex); + + kfree(dev->p->deferred_probe_reason); + dev->p->deferred_probe_reason = kasprintf(GFP_KERNEL, "%s: %pV", drv, vaf); + + mutex_unlock(&deferred_probe_mutex); +} + /* * deferred_devs_show() - Show the devices in the deferred probe pending list. */ @@ -221,7 +241,8 @@ static int deferred_devs_show(struct seq_file *s, void *data) mutex_lock(&deferred_probe_mutex); list_for_each_entry(curr, &deferred_probe_pending_list, deferred_probe) - seq_printf(s, "%s\n", dev_name(curr->device)); + seq_printf(s, "%s\t%s", dev_name(curr->device), + curr->device->p->deferred_probe_reason ?: "\n"); mutex_unlock(&deferred_probe_mutex); -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel