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Thu, 2 Jul 2020 13:44:34 +0000 (GMT) From: Andrzej Hajda To: Greg Kroah-Hartman Subject: [PATCH v8 2/5] driver core: add deferring probe reason to devices_deferred property Date: Thu, 2 Jul 2020 15:44:21 +0200 Message-Id: <20200702134421.6412-1-a.hajda@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: X-Brightmail-Tracker: H4sIAAAAAAAAA0WSbUhTYRTHeXbv7r2OFtcZ+KCRtNKySCsDHyrMIuRSBPUhisLVahe13KZb mvpFw/Kl1GYh1lZmZSqmzpeypq1kmktkmi+TaS4xjdJcEmqaNW3z9vLt9/zP/5z/4fBQmKiL 70PFKC6wKoU0VkwI8Ia2H51bWsackq2D91egwepOPhrXtABUe0vPRwUjYwRaasjHUN/sFIHS H+oJZJ0bx1D7pBVH2fklJKob7eej3sY7BDIVGAGqarWTyJR3Et2dKcDCaaa3vxtjpmxXSMb4 vRhnDFo7yeiybvOZuopsgnmj6eExr+5WkszwNTOPqS9JZfKeVACmOfcmzkzXrTksPCHYLWNj YxJZVXDYaUF01UImFte6PslosYI00LbmKvCgIL0DlnbN864CASWiywEsLW4huccMgFNN9Ty3 S0RPA5hz89zfjsXPOpwzlQH4JX+J96+j0vyJdLsIOhA66wcIN6+iQ+B1i3Z5LEYv4NCamcF3 F7xoCay1DWBuxml/eHnOCtwspEPhe20WwcX5wcc1zcseD/oINOpLlqMhPU7C3rIPfM60H76e t+Mce8EJ8xOS49VwyXCPx3EqHC6/jHHNWQA+rTFgXGEXHOpccKVRrvUCob4xmJP3wvqefuCW Ib0S2hyebhlz4Y2GQoyThTArQ8S518Jhy9M/A73ho7ezf9ZnYPqHeYI7UAmAn+wfgQb4af+H FQNQAbzZBLU8ilVvV7AXg9RSuTpBERV0VimvA65v1rFonnkOGn+dMQGaAuIVQo3ZKRHxpYnq ZLkJQAoTrxLus3RIREKZNDmFVSlPqRJiWbUJ+FK42FsY8mA8UkRHSS+w51k2jlX9rfIoD580 gHd/fZaY0e5/dE+zb2RFn+fEYuD3dYORP/2KqDPHj5myz94PDy0P6ylrCvCZCwLKwnidjd5s SBMLlIcc12wHhswB8Q++rXck1eSllvV4R6CNBZdephdGMEXGiykHlbJjylz7u/wcz5AXI+0E vqFaEf8MrZtw+O8UOI+P6mSTHmJcHS3dtglTqaW/Ad2DKRRiAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrPIsWRmVeSWpSXmKPExsVy+t/xe7qHnvyNM7h5WN/i1rpzrBYvJxxm tNg4Yz2rxdSHT9gs/m+byGxx5et7NovmxevZLK5+f8lscfLNVRaLzolL2C02Pb7GanF51xw2 i0NT9zJarD1yl93iUF+0xdwvU5kdBDwuX7vI7PH+Riu7x95vC1g8ds66y+4xu2Mmq8emVZ1s HicmXGLy2D93DbvH/e7jTB6bl9R79G1ZxehxoHcyi8fnTXIBvFF6NkX5pSWpChn5xSW2StGG FkZ6hpYWekYmlnqGxuaxVkamSvp2NimpOZllqUX6dgl6GWt/tTMXHFGp2Hv2KmMD4zG5LkZO DgkBE4l/L2azgNhCAksZJZ7sNoGIi0vsnv+WGcIWlvhzrYsNouYTo8TEpWBxNgFNib+bb4LF RQSMJfrPzmLvYuTiYBZoY5WYe/4JO0hCWCBG4u+Nd4wgNouAqkTL96tgNq+AucS9WR1sEAvk JVZvOAA2lFMgUGLv+iVQBwVInLjZxzaBkW8BI8MqRpHU0uLc9NxiI73ixNzi0rx0veT83E2M wMjaduznlh2MXe+CDzEKcDAq8fBOOP43Tog1say4MvcQowQHs5IIr9PZ03FCvCmJlVWpRfnx RaU5qcWHGE2BjprILCWanA+M+rySeENTQ3MLS0NzY3NjMwslcd4OgYMxQgLpiSWp2ampBalF MH1MHJxSDYyTjA/6fM878yhdRnDj1unBz/knyIXxLsoMf9wm+alsW2Hbv+hL56JtncV9A5MN Jzfqdi9zXNyj+aqoZdd2N67giQGu2Svfp/7KYNl7amWmbbFd8qedM5QzVVRsVG3VQp+t5nTa ftDZrfvXvugrYhb8H07nT7krcb17r8v6gvWhKrtsrKp/r1FiKc5INNRiLipOBABK6oWQwgIA AA== X-CMS-MailID: 20200702134434eucas1p233a3f66f5bdb4b97f4f49d2d43d45297 X-Msg-Generator: CA X-RootMTR: 20200702134434eucas1p233a3f66f5bdb4b97f4f49d2d43d45297 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200702134434eucas1p233a3f66f5bdb4b97f4f49d2d43d45297 References: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200702_094438_263285_5A8F862A X-CRM114-Status: GOOD ( 22.25 ) 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 dev_err_probe function introduced recently, ie. if dev_err_probe will be called with -EPROBE_DEFER instead of printk the message will be attached to a deferred device and printed when user reads devices_deferred property. Signed-off-by: Andrzej Hajda Reviewed-by: Mark Brown Reviewed-by: Javier Martinez Canillas Reviewed-by: Andy Shevchenko Reviewed-by: Rafael J. Wysocki --- v8: - improved commit message --- 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