From: Saravana Kannan <saravanak@google.com> To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, "Rafael J. Wysocki" <rafael@kernel.org>, Sudeep Holla <sudeep.holla@arm.com>, Cristian Marussi <cristian.marussi@arm.com>, Linus Walleij <linus.walleij@linaro.org>, Bartosz Golaszewski <brgl@bgdev.pl>, Thomas Gleixner <tglx@linutronix.de>, Marc Zyngier <maz@kernel.org>, Shawn Guo <shawnguo@kernel.org>, Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix Kernel Team <kernel@pengutronix.de>, Fabio Estevam <festevam@gmail.com>, NXP Linux Team <linux-imx@nxp.com>, Rob Herring <robh+dt@kernel.org>, Frank Rowand <frowand.list@gmail.com>, Geert Uytterhoeven <geert+renesas@glider.be>, Magnus Damm <magnus.damm@gmail.com>, Len Brown <lenb@kernel.org>, Andy Shevchenko <andriy.shevchenko@linux.intel.com>, Daniel Scally <djrscally@gmail.com>, Heikki Krogerus <heikki.krogerus@linux.intel.com>, Sakari Ailus <sakari.ailus@linux.intel.com>, Saravana Kannan <saravanak@google.com> Cc: Tony Lindgren <tony@atomide.com>, Linux Kernel Functional Testing <lkft@linaro.org>, Naresh Kamboju <naresh.kamboju@linaro.org>, Abel Vesa <abel.vesa@linaro.org>, Alexander Stein <alexander.stein@ew.tq-group.com>, Geert Uytterhoeven <geert@linux-m68k.org>, John Stultz <jstultz@google.com>, Doug Anderson <dianders@chromium.org>, Guenter Roeck <linux@roeck-us.net>, Dmitry Baryshkov <dmitry.baryshkov@linaro.org>, Maxim Kiselev <bigunclemax@gmail.com>, Maxim Kochetkov <fido_max@inbox.ru>, Miquel Raynal <miquel.raynal@bootlin.com>, Luca Weiss <luca.weiss@fairphone.com>, Colin Foster <colin.foster@in-advantage.com>, Martin Kepplinger <martin.kepplinger@puri.sm>, Jean-Philippe Brucker <jpb@kernel.org>, kernel-team@android.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-acpi@vger.kernel.org Subject: [PATCH v2 06/11] driver core: fw_devlink: Allow marking a fwnode link as being part of a cycle Date: Thu, 26 Jan 2023 16:11:33 -0800 [thread overview] Message-ID: <20230127001141.407071-7-saravanak@google.com> (raw) In-Reply-To: <20230127001141.407071-1-saravanak@google.com> To improve detection and handling of dependency cycles, we need to be able to mark fwnode links as being part of cycles. fwnode links marked as being part of a cycle should not block their consumers from probing. Fixes: 2de9d8e0d2fe ("driver core: fw_devlink: Improve handling of cyclic dependencies") Signed-off-by: Saravana Kannan <saravanak@google.com> --- drivers/base/core.c | 41 +++++++++++++++++++++++++++++++++++------ include/linux/fwnode.h | 11 ++++++++++- 2 files changed, 45 insertions(+), 7 deletions(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index e5390b09a02f..82b29e9070bf 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -126,6 +126,19 @@ static void __fwnode_link_del(struct fwnode_link *link) kfree(link); } +/** + * __fwnode_link_cycle - Mark a fwnode link as being part of a cycle. + * @link: the fwnode_link to be marked + * + * The fwnode_link_lock needs to be held when this function is called. + */ +static void __fwnode_link_cycle(struct fwnode_link *link) +{ + pr_debug("%pfwf: Relaxing link with %pfwf\n", + link->consumer, link->supplier); + link->flags |= FWLINK_FLAG_CYCLE; +} + /** * fwnode_links_purge_suppliers - Delete all supplier links of fwnode_handle. * @fwnode: fwnode whose supplier links need to be deleted @@ -1041,6 +1054,23 @@ static bool dev_is_best_effort(struct device *dev) (dev->fwnode && (dev->fwnode->flags & FWNODE_FLAG_BEST_EFFORT)); } +static struct fwnode_handle *fwnode_links_check_suppliers( + struct fwnode_handle *fwnode) +{ + struct fwnode_link *link; + + if (!fwnode || fw_devlink_is_permissive()) + return NULL; + + list_for_each_entry(link, &fwnode->suppliers, c_hook) { + if (link->flags & FWLINK_FLAG_CYCLE) + continue; + return link->supplier; + } + + return NULL; +} + /** * device_links_check_suppliers - Check presence of supplier drivers. * @dev: Consumer device. @@ -1068,11 +1098,8 @@ int device_links_check_suppliers(struct device *dev) * probe. */ mutex_lock(&fwnode_link_lock); - if (dev->fwnode && !list_empty(&dev->fwnode->suppliers) && - !fw_devlink_is_permissive()) { - sup_fw = list_first_entry(&dev->fwnode->suppliers, - struct fwnode_link, - c_hook)->supplier; + sup_fw = fwnode_links_check_suppliers(dev->fwnode); + if (sup_fw) { if (!dev_is_best_effort(dev)) { fwnode_ret = -EPROBE_DEFER; dev_err_probe(dev, -EPROBE_DEFER, @@ -1261,7 +1288,9 @@ static ssize_t waiting_for_supplier_show(struct device *dev, bool val; device_lock(dev); - val = !list_empty(&dev->fwnode->suppliers); + mutex_lock(&fwnode_link_lock); + val = !!fwnode_links_check_suppliers(dev->fwnode); + mutex_unlock(&fwnode_link_lock); device_unlock(dev); return sysfs_emit(buf, "%u\n", val); } diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h index 89b9bdfca925..fdf2ee0285b7 100644 --- a/include/linux/fwnode.h +++ b/include/linux/fwnode.h @@ -18,7 +18,7 @@ struct fwnode_operations; struct device; /* - * fwnode link flags + * fwnode flags * * LINKS_ADDED: The fwnode has already be parsed to add fwnode links. * NOT_DEVICE: The fwnode will never be populated as a struct device. @@ -36,6 +36,7 @@ struct device; #define FWNODE_FLAG_INITIALIZED BIT(2) #define FWNODE_FLAG_NEEDS_CHILD_BOUND_ON_ADD BIT(3) #define FWNODE_FLAG_BEST_EFFORT BIT(4) +#define FWNODE_FLAG_VISITED BIT(5) struct fwnode_handle { struct fwnode_handle *secondary; @@ -46,11 +47,19 @@ struct fwnode_handle { u8 flags; }; +/* + * fwnode link flags + * + * CYCLE: The fwnode link is part of a cycle. Don't defer probe. + */ +#define FWLINK_FLAG_CYCLE BIT(0) + struct fwnode_link { struct fwnode_handle *supplier; struct list_head s_hook; struct fwnode_handle *consumer; struct list_head c_hook; + u8 flags; }; /** -- 2.39.1.456.gfc5497dd1b-goog
WARNING: multiple messages have this Message-ID (diff)
From: Saravana Kannan <saravanak@google.com> To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, "Rafael J. Wysocki" <rafael@kernel.org>, Sudeep Holla <sudeep.holla@arm.com>, Cristian Marussi <cristian.marussi@arm.com>, Linus Walleij <linus.walleij@linaro.org>, Bartosz Golaszewski <brgl@bgdev.pl>, Thomas Gleixner <tglx@linutronix.de>, Marc Zyngier <maz@kernel.org>, Shawn Guo <shawnguo@kernel.org>, Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix Kernel Team <kernel@pengutronix.de>, Fabio Estevam <festevam@gmail.com>, NXP Linux Team <linux-imx@nxp.com>, Rob Herring <robh+dt@kernel.org>, Frank Rowand <frowand.list@gmail.com>, Geert Uytterhoeven <geert+renesas@glider.be>, Magnus Damm <magnus.damm@gmail.com>, Len Brown <lenb@kernel.org>, Andy Shevchenko <andriy.shevchenko@linux.intel.com>, Daniel Scally <djrscally@gmail.com>, Heikki Krogerus <heikki.krogerus@linux.intel.com>, Sakari Ailus <sakari.ailus@linux.intel.com>, Saravana Kannan <saravanak@google.com> Cc: Tony Lindgren <tony@atomide.com>, Linux Kernel Functional Testing <lkft@linaro.org>, Naresh Kamboju <naresh.kamboju@linaro.org>, Abel Vesa <abel.vesa@linaro.org>, Alexander Stein <alexander.stein@ew.tq-group.com>, Geert Uytterhoeven <geert@linux-m68k.org>, John Stultz <jstultz@google.com>, Doug Anderson <dianders@chromium.org>, Guenter Roeck <linux@roeck-us.net>, Dmitry Baryshkov <dmitry.baryshkov@linaro.org>, Maxim Kiselev <bigunclemax@gmail.com>, Maxim Kochetkov <fido_max@inbox.ru>, Miquel Raynal <miquel.raynal@bootlin.com>, Luca Weiss <luca.weiss@fairphone.com>, Colin Foster <colin.foster@in-advantage.com>, Martin Kepplinger <martin.kepplinger@puri.sm>, Jean-Philippe Brucker <jpb@kernel.org>, kernel-team@android.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-acpi@vger.kernel.org Subject: [PATCH v2 06/11] driver core: fw_devlink: Allow marking a fwnode link as being part of a cycle Date: Thu, 26 Jan 2023 16:11:33 -0800 [thread overview] Message-ID: <20230127001141.407071-7-saravanak@google.com> (raw) In-Reply-To: <20230127001141.407071-1-saravanak@google.com> To improve detection and handling of dependency cycles, we need to be able to mark fwnode links as being part of cycles. fwnode links marked as being part of a cycle should not block their consumers from probing. Fixes: 2de9d8e0d2fe ("driver core: fw_devlink: Improve handling of cyclic dependencies") Signed-off-by: Saravana Kannan <saravanak@google.com> --- drivers/base/core.c | 41 +++++++++++++++++++++++++++++++++++------ include/linux/fwnode.h | 11 ++++++++++- 2 files changed, 45 insertions(+), 7 deletions(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index e5390b09a02f..82b29e9070bf 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -126,6 +126,19 @@ static void __fwnode_link_del(struct fwnode_link *link) kfree(link); } +/** + * __fwnode_link_cycle - Mark a fwnode link as being part of a cycle. + * @link: the fwnode_link to be marked + * + * The fwnode_link_lock needs to be held when this function is called. + */ +static void __fwnode_link_cycle(struct fwnode_link *link) +{ + pr_debug("%pfwf: Relaxing link with %pfwf\n", + link->consumer, link->supplier); + link->flags |= FWLINK_FLAG_CYCLE; +} + /** * fwnode_links_purge_suppliers - Delete all supplier links of fwnode_handle. * @fwnode: fwnode whose supplier links need to be deleted @@ -1041,6 +1054,23 @@ static bool dev_is_best_effort(struct device *dev) (dev->fwnode && (dev->fwnode->flags & FWNODE_FLAG_BEST_EFFORT)); } +static struct fwnode_handle *fwnode_links_check_suppliers( + struct fwnode_handle *fwnode) +{ + struct fwnode_link *link; + + if (!fwnode || fw_devlink_is_permissive()) + return NULL; + + list_for_each_entry(link, &fwnode->suppliers, c_hook) { + if (link->flags & FWLINK_FLAG_CYCLE) + continue; + return link->supplier; + } + + return NULL; +} + /** * device_links_check_suppliers - Check presence of supplier drivers. * @dev: Consumer device. @@ -1068,11 +1098,8 @@ int device_links_check_suppliers(struct device *dev) * probe. */ mutex_lock(&fwnode_link_lock); - if (dev->fwnode && !list_empty(&dev->fwnode->suppliers) && - !fw_devlink_is_permissive()) { - sup_fw = list_first_entry(&dev->fwnode->suppliers, - struct fwnode_link, - c_hook)->supplier; + sup_fw = fwnode_links_check_suppliers(dev->fwnode); + if (sup_fw) { if (!dev_is_best_effort(dev)) { fwnode_ret = -EPROBE_DEFER; dev_err_probe(dev, -EPROBE_DEFER, @@ -1261,7 +1288,9 @@ static ssize_t waiting_for_supplier_show(struct device *dev, bool val; device_lock(dev); - val = !list_empty(&dev->fwnode->suppliers); + mutex_lock(&fwnode_link_lock); + val = !!fwnode_links_check_suppliers(dev->fwnode); + mutex_unlock(&fwnode_link_lock); device_unlock(dev); return sysfs_emit(buf, "%u\n", val); } diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h index 89b9bdfca925..fdf2ee0285b7 100644 --- a/include/linux/fwnode.h +++ b/include/linux/fwnode.h @@ -18,7 +18,7 @@ struct fwnode_operations; struct device; /* - * fwnode link flags + * fwnode flags * * LINKS_ADDED: The fwnode has already be parsed to add fwnode links. * NOT_DEVICE: The fwnode will never be populated as a struct device. @@ -36,6 +36,7 @@ struct device; #define FWNODE_FLAG_INITIALIZED BIT(2) #define FWNODE_FLAG_NEEDS_CHILD_BOUND_ON_ADD BIT(3) #define FWNODE_FLAG_BEST_EFFORT BIT(4) +#define FWNODE_FLAG_VISITED BIT(5) struct fwnode_handle { struct fwnode_handle *secondary; @@ -46,11 +47,19 @@ struct fwnode_handle { u8 flags; }; +/* + * fwnode link flags + * + * CYCLE: The fwnode link is part of a cycle. Don't defer probe. + */ +#define FWLINK_FLAG_CYCLE BIT(0) + struct fwnode_link { struct fwnode_handle *supplier; struct list_head s_hook; struct fwnode_handle *consumer; struct list_head c_hook; + u8 flags; }; /** -- 2.39.1.456.gfc5497dd1b-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2023-01-27 0:12 UTC|newest] Thread overview: 146+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-01-27 0:11 [PATCH v2 00/11] fw_devlink improvements Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-27 0:11 ` [PATCH v2 01/11] driver core: fw_devlink: Don't purge child fwnode's consumer links Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-27 9:21 ` Andy Shevchenko 2023-01-27 9:21 ` Andy Shevchenko 2023-01-28 7:33 ` Saravana Kannan 2023-01-28 7:33 ` Saravana Kannan 2023-01-30 12:04 ` Andy Shevchenko 2023-01-30 12:04 ` Andy Shevchenko 2023-01-27 0:11 ` [PATCH v2 02/11] driver core: fw_devlink: Improve check for fwnode with no device/driver Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-27 0:11 ` [PATCH v2 03/11] soc: renesas: Move away from using OF_POPULATED for fw_devlink Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-27 8:11 ` Geert Uytterhoeven 2023-01-27 8:11 ` Geert Uytterhoeven 2023-01-28 7:18 ` Saravana Kannan 2023-01-28 7:18 ` Saravana Kannan 2023-01-30 8:42 ` Geert Uytterhoeven 2023-01-30 8:42 ` Geert Uytterhoeven 2023-01-30 20:00 ` Saravana Kannan 2023-01-30 20:00 ` Saravana Kannan 2023-01-31 8:14 ` Geert Uytterhoeven 2023-01-31 8:14 ` Geert Uytterhoeven 2023-02-04 22:30 ` Saravana Kannan 2023-02-04 22:30 ` Saravana Kannan 2023-01-27 9:25 ` Andy Shevchenko 2023-01-27 9:25 ` Andy Shevchenko 2023-01-27 9:30 ` Geert Uytterhoeven 2023-01-27 9:30 ` Geert Uytterhoeven 2023-01-27 9:44 ` Andy Shevchenko 2023-01-27 9:44 ` Andy Shevchenko 2023-01-27 0:11 ` [PATCH v2 04/11] gpiolib: Clear the gpio_device's fwnode initialized flag before adding Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-27 9:27 ` Andy Shevchenko 2023-01-27 9:27 ` Andy Shevchenko 2023-01-28 7:33 ` Saravana Kannan 2023-01-28 7:33 ` Saravana Kannan 2023-01-30 12:05 ` Andy Shevchenko 2023-01-30 12:05 ` Andy Shevchenko 2023-01-30 14:31 ` Sudeep Holla 2023-01-30 14:31 ` Sudeep Holla 2023-01-30 15:14 ` Andy Shevchenko 2023-01-30 15:14 ` Andy Shevchenko 2023-01-31 4:01 ` Saravana Kannan 2023-01-31 4:01 ` Saravana Kannan 2023-01-31 10:13 ` Sudeep Holla 2023-01-31 10:13 ` Sudeep Holla 2023-02-04 22:32 ` Saravana Kannan 2023-02-04 22:32 ` Saravana Kannan 2023-01-27 0:11 ` [PATCH v2 05/11] driver core: fw_devlink: Add DL_FLAG_CYCLE support to device links Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-27 9:29 ` Andy Shevchenko 2023-01-27 9:29 ` Andy Shevchenko 2023-01-27 9:30 ` Andy Shevchenko 2023-01-27 9:30 ` Andy Shevchenko 2023-01-27 9:55 ` Geert Uytterhoeven 2023-01-27 9:55 ` Geert Uytterhoeven 2023-01-28 7:34 ` Saravana Kannan 2023-01-28 7:34 ` Saravana Kannan 2023-01-30 12:08 ` Andy Shevchenko 2023-01-30 12:08 ` Andy Shevchenko 2023-01-27 0:11 ` Saravana Kannan [this message] 2023-01-27 0:11 ` [PATCH v2 06/11] driver core: fw_devlink: Allow marking a fwnode link as being part of a cycle Saravana Kannan 2023-01-27 9:33 ` Andy Shevchenko 2023-01-27 9:33 ` Andy Shevchenko 2023-01-28 7:34 ` Saravana Kannan 2023-01-28 7:34 ` Saravana Kannan 2023-01-30 12:09 ` Andy Shevchenko 2023-01-30 12:09 ` Andy Shevchenko 2023-01-27 0:11 ` [PATCH v2 07/11] driver core: fw_devlink: Consolidate device link flag computation Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-27 0:11 ` [PATCH v2 08/11] driver core: fw_devlink: Make cycle detection more robust Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-27 9:43 ` Andy Shevchenko 2023-01-27 9:43 ` Andy Shevchenko 2023-01-27 9:52 ` Geert Uytterhoeven 2023-01-27 9:52 ` Geert Uytterhoeven 2023-01-27 10:10 ` Andy Shevchenko 2023-01-27 10:10 ` Andy Shevchenko 2023-01-27 10:29 ` Geert Uytterhoeven 2023-01-27 10:29 ` Geert Uytterhoeven 2023-01-28 7:34 ` Saravana Kannan 2023-01-28 7:34 ` Saravana Kannan 2023-01-30 12:15 ` Andy Shevchenko 2023-01-30 12:15 ` Andy Shevchenko 2023-01-30 14:36 ` Geert Uytterhoeven 2023-01-30 14:36 ` Geert Uytterhoeven 2023-01-30 15:16 ` Andy Shevchenko 2023-01-30 15:16 ` Andy Shevchenko 2023-01-27 0:11 ` [PATCH v2 09/11] of: property: Simplify of_link_to_phandle() Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-30 14:39 ` Sakari Ailus 2023-01-30 14:39 ` Sakari Ailus 2023-01-31 3:51 ` Saravana Kannan 2023-01-31 3:51 ` Saravana Kannan 2023-01-27 0:11 ` [PATCH v2 10/11] irqchip/irq-imx-gpcv2: Mark fwnode device as not initialized Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-27 9:51 ` Andy Shevchenko 2023-01-27 9:51 ` Andy Shevchenko 2023-01-28 7:34 ` Saravana Kannan 2023-01-28 7:34 ` Saravana Kannan 2023-01-27 0:11 ` [PATCH v2 11/11] firmware: arm_scmi: Set fwnode for the scmi_device Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-27 9:52 ` Andy Shevchenko 2023-01-27 9:52 ` Andy Shevchenko 2023-01-27 10:48 ` Sudeep Holla 2023-01-27 10:48 ` Sudeep Holla 2023-01-27 20:30 ` [PATCH v2 00/11] fw_devlink improvements Colin Foster 2023-01-27 20:30 ` Colin Foster 2023-01-27 21:35 ` Saravana Kannan 2023-01-27 21:35 ` Saravana Kannan 2023-01-30 8:55 ` Naresh Kamboju 2023-01-30 8:55 ` Naresh Kamboju 2023-01-30 10:49 ` Marc Zyngier 2023-01-30 10:49 ` Marc Zyngier 2023-01-30 23:03 ` Saravana Kannan 2023-01-30 23:03 ` Saravana Kannan 2023-01-31 10:18 ` Sudeep Holla 2023-01-31 10:18 ` Sudeep Holla 2023-02-02 17:36 ` Maxim Kiselev 2023-02-02 17:36 ` Maxim Kiselev 2023-02-03 6:07 ` Saravana Kannan 2023-02-03 6:07 ` Saravana Kannan 2023-02-03 9:39 ` Maxim Kiselev 2023-02-03 9:39 ` Maxim Kiselev 2023-02-06 1:32 ` Saravana Kannan 2023-02-06 1:32 ` Saravana Kannan 2023-02-06 2:17 ` Saravana Kannan 2023-02-06 2:17 ` Saravana Kannan 2023-02-06 9:39 ` Miquel Raynal 2023-02-06 9:39 ` Miquel Raynal 2023-02-06 20:08 ` Saravana Kannan 2023-02-06 20:08 ` Saravana Kannan 2023-02-24 14:46 ` Miquel Raynal 2023-02-24 14:46 ` Miquel Raynal 2023-02-06 15:18 ` Rob Herring 2023-02-06 15:18 ` Rob Herring 2023-02-06 19:59 ` Saravana Kannan 2023-02-06 19:59 ` Saravana Kannan 2023-01-30 10:48 ` Miquel Raynal 2023-01-30 10:48 ` Miquel Raynal 2023-01-30 12:08 ` Maxim Kiselev 2023-01-30 12:08 ` Maxim Kiselev 2023-01-31 1:20 ` Saravana Kannan 2023-01-31 1:20 ` Saravana Kannan
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