From patchwork Tue Feb 7 01:41:53 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saravana Kannan X-Patchwork-Id: 13130853 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4DDD9C61DA4 for ; Tue, 7 Feb 2023 01:42:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230334AbjBGBm0 (ORCPT ); Mon, 6 Feb 2023 20:42:26 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40534 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230301AbjBGBmQ (ORCPT ); Mon, 6 Feb 2023 20:42:16 -0500 Received: from mail-pl1-x649.google.com (mail-pl1-x649.google.com [IPv6:2607:f8b0:4864:20::649]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 046E5113ED for ; Mon, 6 Feb 2023 17:42:13 -0800 (PST) Received: by mail-pl1-x649.google.com with SMTP id l1-20020a17090270c100b00198be135a14so7204408plt.9 for ; Mon, 06 Feb 2023 17:42:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=qilJcjCuMQ+UEcym7b4h9C92RRJ6Qj6pHG5dlY6nsNI=; b=W3xpeO/Rx34noJBz5nd6A4bxsUDyoqIhh7Cb2x3UmXZsoK8ED+AALcboiCZqoyinys 1toeCq44NyFwUzZ+gzQLgSl+KCNP+GEf6kLLEg+JXta1FpZzeLUU2keUV7ERvssI1FOu hpIoNUBWt2EucoDAErFvCDxGsmVEr2TJ6EKK7+n9BQxjio75CJwBibBIhOgfvSYZL/gy afaIUUJIivpS9OSgOyPy1/Ekhq88quTU3lpmMYtruya4C6g0GeUFX8y9KkixEga6+mtF BrJdWYEvqyNBme4s39lZ7YjVtDKbb6Vre9yguxW8VdqTPi5yoBdDTn8iTA1PZhhsB6Kx CwaQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=qilJcjCuMQ+UEcym7b4h9C92RRJ6Qj6pHG5dlY6nsNI=; b=Ae9NOiLjBdsk3XphS9avAOVsbR51SahLnov+r6NXUM34BcgF0BE1tjmmhQFWwjUGTW HRhMiXXwIW3cQHU9w9f1d10mhClCa7FFN2jookyDql+zy/ksq9rFmCXFSzZu5FB0rq4/ eSjEta5ytc5YFORN/f9W7BosFl2lnLyjkUW/uqORKyujaOFnJuVIe+luCRvQNWJ2XZ0N s+67J8CdTOfHxhNqYGt34jbwzJCu0oQOta9yKKzkq987FjI6QbVNmcNaHkXPHO14g6r+ B5ue1xYAztNp/EgaRvf1Xl43MTFr6OhoVM8CSjVJARSCKUX+vZiUxs21lgNVZ1iAqCLt 2GKg== X-Gm-Message-State: AO0yUKXAamPiJGUirfMjKKWHt82L+DyMwUWP+Kt/RetNc+Kz+cKbUvDp 5rPW4cNkdjqVEORBz4u9ByQBO/AeGYwtnq8= X-Google-Smtp-Source: AK7set9WA6uQ/1FNztyQpvzAT03IkHDfAC4BORG9y1kTW3w7tVvng8KdB/nV5PiGcKyoyrHyfOxaYgRn3+dBCkM= X-Received: from saravanak.san.corp.google.com ([2620:15c:2d:3:ae1:aba6:f21c:4a94]) (user=saravanak job=sendgmr) by 2002:a17:90a:bd04:b0:215:f80c:18e6 with SMTP id y4-20020a17090abd0400b00215f80c18e6mr4002191pjr.45.1675734133267; Mon, 06 Feb 2023 17:42:13 -0800 (PST) Date: Mon, 6 Feb 2023 17:41:53 -0800 In-Reply-To: <20230207014207.1678715-1-saravanak@google.com> Message-Id: <20230207014207.1678715-2-saravanak@google.com> Mime-Version: 1.0 References: <20230207014207.1678715-1-saravanak@google.com> X-Mailer: git-send-email 2.39.1.519.gcb327c4b5f-goog Subject: [PATCH v3 01/12] driver core: fw_devlink: Don't purge child fwnode's consumer links From: Saravana Kannan To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Sudeep Holla , Cristian Marussi , Linus Walleij , Bartosz Golaszewski , Thomas Gleixner , Marc Zyngier , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Frank Rowand , Geert Uytterhoeven , Magnus Damm , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Len Brown , Saravana Kannan , " =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= " Cc: Abel Vesa , Alexander Stein , Tony Lindgren , Geert Uytterhoeven , John Stultz , Doug Anderson , Guenter Roeck , Dmitry Baryshkov , Maxim Kiselev , Maxim Kochetkov , Luca Weiss , Colin Foster , Martin Kepplinger , Jean-Philippe Brucker , Vladimir Oltean , kernel-team@android.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-acpi@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org When a device X is bound successfully to a driver, if it has a child firmware node Y that doesn't have a struct device created by then, we delete fwnode links where the child firmware node Y is the supplier. We did this to avoid blocking the consumers of the child firmware node Y from deferring probe indefinitely. While that a step in the right direction, it's better to make the consumers of the child firmware node Y to be consumers of the device X because device X is probably implementing whatever functionality is represented by child firmware node Y. By doing this, we capture the device dependencies more accurately and ensure better probe/suspend/resume ordering. Signed-off-by: Saravana Kannan Tested-by: Colin Foster Tested-by: Sudeep Holla --- drivers/base/core.c | 97 ++++++++++++++++++++++++++++++++++++--------- 1 file changed, 79 insertions(+), 18 deletions(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index a3e14143ec0c..001e1914858d 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -54,11 +54,12 @@ static LIST_HEAD(deferred_sync); static unsigned int defer_sync_state_count = 1; static DEFINE_MUTEX(fwnode_link_lock); static bool fw_devlink_is_permissive(void); +static void __fw_devlink_link_to_consumers(struct device *dev); static bool fw_devlink_drv_reg_done; static bool fw_devlink_best_effort; /** - * fwnode_link_add - Create a link between two fwnode_handles. + * __fwnode_link_add - Create a link between two fwnode_handles. * @con: Consumer end of the link. * @sup: Supplier end of the link. * @@ -74,22 +75,18 @@ static bool fw_devlink_best_effort; * Attempts to create duplicate links between the same pair of fwnode handles * are ignored and there is no reference counting. */ -int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup) +static int __fwnode_link_add(struct fwnode_handle *con, + struct fwnode_handle *sup) { struct fwnode_link *link; - int ret = 0; - - mutex_lock(&fwnode_link_lock); list_for_each_entry(link, &sup->consumers, s_hook) if (link->consumer == con) - goto out; + return 0; link = kzalloc(sizeof(*link), GFP_KERNEL); - if (!link) { - ret = -ENOMEM; - goto out; - } + if (!link) + return -ENOMEM; link->supplier = sup; INIT_LIST_HEAD(&link->s_hook); @@ -100,9 +97,17 @@ int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup) list_add(&link->c_hook, &con->suppliers); pr_debug("%pfwP Linked as a fwnode consumer to %pfwP\n", con, sup); -out: - mutex_unlock(&fwnode_link_lock); + return 0; +} + +int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup) +{ + int ret; + + mutex_lock(&fwnode_link_lock); + ret = __fwnode_link_add(con, sup); + mutex_unlock(&fwnode_link_lock); return ret; } @@ -181,6 +186,51 @@ void fw_devlink_purge_absent_suppliers(struct fwnode_handle *fwnode) } EXPORT_SYMBOL_GPL(fw_devlink_purge_absent_suppliers); +/** + * __fwnode_links_move_consumers - Move consumer from @from to @to fwnode_handle + * @from: move consumers away from this fwnode + * @to: move consumers to this fwnode + * + * Move all consumer links from @from fwnode to @to fwnode. + */ +static void __fwnode_links_move_consumers(struct fwnode_handle *from, + struct fwnode_handle *to) +{ + struct fwnode_link *link, *tmp; + + list_for_each_entry_safe(link, tmp, &from->consumers, s_hook) { + __fwnode_link_add(link->consumer, to); + __fwnode_link_del(link); + } +} + +/** + * __fw_devlink_pickup_dangling_consumers - Pick up dangling consumers + * @fwnode: fwnode from which to pick up dangling consumers + * @new_sup: fwnode of new supplier + * + * If the @fwnode has a corresponding struct device and the device supports + * probing (that is, added to a bus), then we want to let fw_devlink create + * MANAGED device links to this device, so leave @fwnode and its descendant's + * fwnode links alone. + * + * Otherwise, move its consumers to the new supplier @new_sup. + */ +static void __fw_devlink_pickup_dangling_consumers(struct fwnode_handle *fwnode, + struct fwnode_handle *new_sup) +{ + struct fwnode_handle *child; + + if (fwnode->dev && fwnode->dev->bus) + return; + + fwnode->flags |= FWNODE_FLAG_NOT_DEVICE; + __fwnode_links_move_consumers(fwnode, new_sup); + + fwnode_for_each_available_child_node(fwnode, child) + __fw_devlink_pickup_dangling_consumers(child, new_sup); +} + #ifdef CONFIG_SRCU static DEFINE_MUTEX(device_links_lock); DEFINE_STATIC_SRCU(device_links_srcu); @@ -1267,16 +1317,23 @@ void device_links_driver_bound(struct device *dev) * them. So, fw_devlink no longer needs to create device links to any * of the device's suppliers. * - * Also, if a child firmware node of this bound device is not added as - * a device by now, assume it is never going to be added and make sure - * other devices don't defer probe indefinitely by waiting for such a - * child device. + * Also, if a child firmware node of this bound device is not added as a + * device by now, assume it is never going to be added. Make this bound + * device the fallback supplier to the dangling consumers of the child + * firmware node because this bound device is probably implementing the + * child firmware node functionality and we don't want the dangling + * consumers to defer probe indefinitely waiting for a device for the + * child firmware node. */ if (dev->fwnode && dev->fwnode->dev == dev) { struct fwnode_handle *child; fwnode_links_purge_suppliers(dev->fwnode); + mutex_lock(&fwnode_link_lock); fwnode_for_each_available_child_node(dev->fwnode, child) - fw_devlink_purge_absent_suppliers(child); + __fw_devlink_pickup_dangling_consumers(child, + dev->fwnode); + __fw_devlink_link_to_consumers(dev); + mutex_unlock(&fwnode_link_lock); } device_remove_file(dev, &dev_attr_waiting_for_supplier); @@ -1855,7 +1912,11 @@ static int fw_devlink_create_devlink(struct device *con, fwnode_is_ancestor_of(sup_handle, con->fwnode)) return -EINVAL; - sup_dev = get_dev_from_fwnode(sup_handle); + if (sup_handle->flags & FWNODE_FLAG_NOT_DEVICE) + sup_dev = fwnode_get_next_parent_dev(sup_handle); + else + sup_dev = get_dev_from_fwnode(sup_handle); + if (sup_dev) { /* * If it's one of those drivers that don't actually bind to From patchwork Tue Feb 7 01:41:54 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saravana Kannan X-Patchwork-Id: 13130854 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id ED3A6C64EC4 for ; Tue, 7 Feb 2023 01:42:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230353AbjBGBm1 (ORCPT ); Mon, 6 Feb 2023 20:42:27 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40854 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230318AbjBGBmZ (ORCPT ); Mon, 6 Feb 2023 20:42:25 -0500 Received: from mail-pf1-x44a.google.com (mail-pf1-x44a.google.com [IPv6:2607:f8b0:4864:20::44a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 72C1217168 for ; Mon, 6 Feb 2023 17:42:16 -0800 (PST) Received: by mail-pf1-x44a.google.com with SMTP id k22-20020a056a00169600b00593939d0601so7269999pfc.5 for ; Mon, 06 Feb 2023 17:42:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=rF935xJruDmZakfcqYl07qySBy4v0tdY/SRPeseRpYs=; b=nVLihGug+gPNpky+kL8lZ+ojXplNGe2YAeogfY96aFh2Qm/Qk1O3o22nE2SbLQGizJ IQUGcIv0V1RiPC3mFC95Ns51BBCdycBZmzZp1eBZeHMb3hEEexERUn9/qygKgFkVNpb0 Diq/OdiPdmE0e1Mvqy6mPGaGFUAI0qc+AzilSeGTt20pgttfB2UI6oxiuR9XlQq9Felm iClxVp1dKr/FoyJc+rxT9XgQscF8UCsnjjVVGve0zIcTwL+GUrEfoISySe93O475VMth fWwpZNaXC0o8y1s1tvJPiWtm14hX9OdBngkkg5kHlfY9ArsLQ75uwryzy35mTFf3XSiq xXfA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=rF935xJruDmZakfcqYl07qySBy4v0tdY/SRPeseRpYs=; b=cgBO27UNfnjl77mPXayObFVWRSsHQWNIDxalzuR57UblFT/AMGD8MG81ppsLJXyTaf x/bMuzPDUhGY4cNN5GRhdA/nomiEtk4pPRPqnRxwUDnaU0GpthlZy3HnB8+sAIl4w4wO 1d1Bh2t/15SPaO4W0l9XdQmWaObkQARswDiBciFcoJ93rruNoQRLO5Co80spbBN1AphY LGfbjAExvFxP+3VJJoBgh0ilyNUjTOmRghi3C6+6pWnb6BV/Gm6Nnh+usuev5LjjFEfg /+WsYvueg2Y4ydhla4L/mQZuXslTIsWMcT9/XglPeCyWSurgd6XEsf7p5G0BHpM2MPcS YuyQ== X-Gm-Message-State: AO0yUKWHPazitCiV0jLMCrkJE3ek10rtbCiams7hOP3kQryhgCKSx7Ni HT5dgQZ0qjLMaDqD31Phf0qctEqFAYMJcB4= X-Google-Smtp-Source: AK7set9i7jgE6FpR3noUhzo8MnwFszLcteNew7Oyn7nbowkMqjNTsdQ07Wf9bCz+hy9cTEgusCXLrQQHzICPoq0= X-Received: from saravanak.san.corp.google.com ([2620:15c:2d:3:ae1:aba6:f21c:4a94]) (user=saravanak job=sendgmr) by 2002:a63:7114:0:b0:476:f69c:2304 with SMTP id m20-20020a637114000000b00476f69c2304mr169807pgc.77.1675734135795; Mon, 06 Feb 2023 17:42:15 -0800 (PST) Date: Mon, 6 Feb 2023 17:41:54 -0800 In-Reply-To: <20230207014207.1678715-1-saravanak@google.com> Message-Id: <20230207014207.1678715-3-saravanak@google.com> Mime-Version: 1.0 References: <20230207014207.1678715-1-saravanak@google.com> X-Mailer: git-send-email 2.39.1.519.gcb327c4b5f-goog Subject: [PATCH v3 02/12] driver core: fw_devlink: Improve check for fwnode with no device/driver From: Saravana Kannan To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Sudeep Holla , Cristian Marussi , Linus Walleij , Bartosz Golaszewski , Thomas Gleixner , Marc Zyngier , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Frank Rowand , Geert Uytterhoeven , Magnus Damm , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Len Brown , Saravana Kannan , " =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= " Cc: Abel Vesa , Alexander Stein , Tony Lindgren , Geert Uytterhoeven , John Stultz , Doug Anderson , Guenter Roeck , Dmitry Baryshkov , Maxim Kiselev , Maxim Kochetkov , Luca Weiss , Colin Foster , Martin Kepplinger , Jean-Philippe Brucker , Vladimir Oltean , kernel-team@android.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-acpi@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org fw_devlink shouldn't defer the probe of a device to wait on a supplier that'll never have a struct device or will never be probed by a driver. We currently check if a supplier falls into this category, but don't check its ancestors. We need to check the ancestors too because if the ancestor will never probe, then the supplier will never probe either. Signed-off-by: Saravana Kannan Tested-by: Colin Foster Tested-by: Sudeep Holla --- drivers/base/core.c | 40 ++++++++++++++++++++++++++++++++++++++-- 1 file changed, 38 insertions(+), 2 deletions(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index 001e1914858d..368bfd96b511 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -1867,6 +1867,35 @@ static int fw_devlink_relax_cycle(struct device *con, void *sup) return ret; } +static bool fwnode_init_without_drv(struct fwnode_handle *fwnode) +{ + struct device *dev; + bool ret; + + if (!(fwnode->flags & FWNODE_FLAG_INITIALIZED)) + return false; + + dev = get_dev_from_fwnode(fwnode); + ret = !dev || dev->links.status == DL_DEV_NO_DRIVER; + put_device(dev); + + return ret; +} + +static bool fwnode_ancestor_init_without_drv(struct fwnode_handle *fwnode) +{ + struct fwnode_handle *parent; + + fwnode_for_each_parent_node(fwnode, parent) { + if (fwnode_init_without_drv(parent)) { + fwnode_handle_put(parent); + return true; + } + } + + return false; +} + /** * fw_devlink_create_devlink - Create a device link from a consumer to fwnode * @con: consumer device for the device link @@ -1948,9 +1977,16 @@ static int fw_devlink_create_devlink(struct device *con, goto out; } - /* Supplier that's already initialized without a struct device. */ - if (sup_handle->flags & FWNODE_FLAG_INITIALIZED) + /* + * Supplier or supplier's ancestor already initialized without a struct + * device or being probed by a driver. + */ + if (fwnode_init_without_drv(sup_handle) || + fwnode_ancestor_init_without_drv(sup_handle)) { + dev_dbg(con, "Not linking %pfwP - Might never probe\n", + sup_handle); return -EINVAL; + } /* * DL_FLAG_SYNC_STATE_ONLY doesn't block probing and supports From patchwork Tue Feb 7 01:41:55 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saravana Kannan X-Patchwork-Id: 13130855 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 937DEC64ED6 for ; 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Mon, 06 Feb 2023 17:42:18 -0800 (PST) Date: Mon, 6 Feb 2023 17:41:55 -0800 In-Reply-To: <20230207014207.1678715-1-saravanak@google.com> Message-Id: <20230207014207.1678715-4-saravanak@google.com> Mime-Version: 1.0 References: <20230207014207.1678715-1-saravanak@google.com> X-Mailer: git-send-email 2.39.1.519.gcb327c4b5f-goog Subject: [PATCH v3 03/12] soc: renesas: Move away from using OF_POPULATED for fw_devlink From: Saravana Kannan To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Sudeep Holla , Cristian Marussi , Linus Walleij , Bartosz Golaszewski , Thomas Gleixner , Marc Zyngier , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Frank Rowand , Geert Uytterhoeven , Magnus Damm , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Len Brown , Saravana Kannan , " =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= " Cc: Abel Vesa , Alexander Stein , Tony Lindgren , Geert Uytterhoeven , John Stultz , Doug Anderson , Guenter Roeck , Dmitry Baryshkov , Maxim Kiselev , Maxim Kochetkov , Luca Weiss , Colin Foster , Martin Kepplinger , Jean-Philippe Brucker , Vladimir Oltean , kernel-team@android.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-acpi@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org The OF_POPULATED flag was set to let fw_devlink know that the device tree node will not have a struct device created for it. This information is used by fw_devlink to avoid deferring the probe of consumers of this device tree node. Let's use fwnode_dev_initialized() instead because it achieves the same effect without using OF specific flags. This allows more generic code to be written in driver core. Signed-off-by: Saravana Kannan Reviewed-by: Geert Uytterhoeven Acked-by: Geert Uytterhoeven --- drivers/soc/renesas/rcar-sysc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/soc/renesas/rcar-sysc.c b/drivers/soc/renesas/rcar-sysc.c index b0a80de34c98..eed47696e825 100644 --- a/drivers/soc/renesas/rcar-sysc.c +++ b/drivers/soc/renesas/rcar-sysc.c @@ -437,7 +437,7 @@ static int __init rcar_sysc_pd_init(void) error = of_genpd_add_provider_onecell(np, &domains->onecell_data); if (!error) - of_node_set_flag(np, OF_POPULATED); + fwnode_dev_initialized(of_fwnode_handle(np), true); out_put: of_node_put(np); From patchwork Tue Feb 7 01:41:56 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saravana Kannan X-Patchwork-Id: 13130856 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 74861C636D6 for ; Tue, 7 Feb 2023 01:42:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230411AbjBGBmq (ORCPT ); Mon, 6 Feb 2023 20:42:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40940 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230325AbjBGBm2 (ORCPT ); Mon, 6 Feb 2023 20:42:28 -0500 Received: from mail-pl1-x64a.google.com (mail-pl1-x64a.google.com [IPv6:2607:f8b0:4864:20::64a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 001523527D for ; Mon, 6 Feb 2023 17:42:21 -0800 (PST) Received: by mail-pl1-x64a.google.com with SMTP id t12-20020a170902b20c00b00192e3d10c5bso7257306plr.4 for ; Mon, 06 Feb 2023 17:42:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=ORUuC30mhLyGGOfOGNQGmV2Hk9NLu8NgqlPyUePgVtw=; b=W3ks5YEw7SKIgSIZBtQHBL9lJVPSdYZt5YLLOMNiqg39kU3nN1EI6XuA+B32uaPZGb v5zyhRmRRHO+O/PDHZr10O4cRAMqIo+F89AcNblg/s/+76O4QIK+2qBAbUZrxge36Zai oUQ3lkDhN+g7lBRIxR1KVI98eol03ANv+ysGxNp9Jy33gMZ7+KWT14YWjTKmLM4h0Sde uDNF/Fk2U8cuXtdVSlDGUvhsCS+fTpqnyi3ghq5nNuitlb38EuGaeD8xzBpXE/R4GDSO N9LcyuvRftt3ULpiqwLSIoYSZ3EjoLNyWNXZS4LCua4bI5CqUx3cJx+UrAWXqFnajwKW grxg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=ORUuC30mhLyGGOfOGNQGmV2Hk9NLu8NgqlPyUePgVtw=; b=xdpUrGGNZlFZpLZ2pAmEkc4Kyyu+mLH1kjxYZoBBQ1yXbHq/In10kamPurgn8U5E/f FJsveVIdDu01X/djmOiGv+IhLLqywNEP/wnJTn9N75ebt6wddMR6pjZaPMdtDLsZDqBe e+/DXgZ3/CO4ApXEeqF+2vEA+12YRmLuVUR0PS0iVA06DcEZtm/BDMz//JPTTrs8JLnf zdIRv9uX/3xrGCx72wxZh0jvTXmd7z+f2C4zZD7t3y9Ngucb5DX9pkOhnVPhhuSOtgft GwbxnfSRwuwuvLaVUhhHS1CAXUxesLHlghBTANw4PQ2Jsp/w8PIffMRw4MVI21Xx+ubI SBeg== X-Gm-Message-State: AO0yUKVZRuRMxigbRXKL0DlIXTxO9h/fLvhGnZ9gfU2dvQOOBtV0cx5t m/huyNUs9eNPPMyhdc2GQcWM3UhWIHVZzO0= X-Google-Smtp-Source: AK7set8txtYYhJ0J+28pL4WUJBO9Kkr3uP9QQWYQBMNjYhLp0mg9chNGGE1J5xNq3IdUI/epAkGwDw5ZAcogFH0= X-Received: from saravanak.san.corp.google.com ([2620:15c:2d:3:ae1:aba6:f21c:4a94]) (user=saravanak job=sendgmr) by 2002:a17:90a:3f8f:b0:230:792d:7519 with SMTP id m15-20020a17090a3f8f00b00230792d7519mr425744pjc.22.1675734141281; Mon, 06 Feb 2023 17:42:21 -0800 (PST) Date: Mon, 6 Feb 2023 17:41:56 -0800 In-Reply-To: <20230207014207.1678715-1-saravanak@google.com> Message-Id: <20230207014207.1678715-5-saravanak@google.com> Mime-Version: 1.0 References: <20230207014207.1678715-1-saravanak@google.com> X-Mailer: git-send-email 2.39.1.519.gcb327c4b5f-goog Subject: [PATCH v3 04/12] gpiolib: Clear the gpio_device's fwnode initialized flag before adding From: Saravana Kannan To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Sudeep Holla , Cristian Marussi , Linus Walleij , Bartosz Golaszewski , Thomas Gleixner , Marc Zyngier , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Frank Rowand , Geert Uytterhoeven , Magnus Damm , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Len Brown , Saravana Kannan , " =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= " Cc: Abel Vesa , Alexander Stein , Tony Lindgren , Geert Uytterhoeven , John Stultz , Doug Anderson , Guenter Roeck , Dmitry Baryshkov , Maxim Kiselev , Maxim Kochetkov , Luca Weiss , Colin Foster , Martin Kepplinger , Jean-Philippe Brucker , Vladimir Oltean , kernel-team@android.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-acpi@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Registering an irqdomain sets the flag for the fwnode. But having the flag set when a device is added is interpreted by fw_devlink to mean the device has already been initialized and will never probe. This prevents fw_devlink from creating device links with the gpio_device as a supplier. So, clear the flag before adding the device. Signed-off-by: Saravana Kannan Acked-by: Bartosz Golaszewski Tested-by: Colin Foster Tested-by: Sudeep Holla Reviewed-by: Andy Shevchenko --- drivers/gpio/gpiolib.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 939c776b9488..bdb9493857eb 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -578,6 +578,13 @@ static int gpiochip_setup_dev(struct gpio_device *gdev) { int ret; + /* + * If fwnode doesn't belong to another device, it's safe to clear its + * initialized flag. + */ + if (gdev->dev.fwnode && !gdev->dev.fwnode->dev) + fwnode_dev_initialized(gdev->dev.fwnode, false); + ret = gcdev_register(gdev, gpio_devt); if (ret) return ret; From patchwork Tue Feb 7 01:41:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saravana Kannan X-Patchwork-Id: 13130857 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BA95FC636D3 for ; Tue, 7 Feb 2023 01:42:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230365AbjBGBmw (ORCPT ); Mon, 6 Feb 2023 20:42:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41072 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230374AbjBGBm3 (ORCPT ); Mon, 6 Feb 2023 20:42:29 -0500 Received: from mail-pf1-x44a.google.com (mail-pf1-x44a.google.com [IPv6:2607:f8b0:4864:20::44a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 63F7535262 for ; Mon, 6 Feb 2023 17:42:24 -0800 (PST) Received: by mail-pf1-x44a.google.com with SMTP id x26-20020aa793ba000000b0059a7d7fee19so3958863pff.20 for ; Mon, 06 Feb 2023 17:42:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=GzemyWsbe1874/35X2pGE6I7zLC/qObwAXplkSqm2aE=; b=b7u37IEj5Fvd6YXLTEOU720DHRSwTWNj09MbzD4MFmQBovqJgQg/oKrS1P046uOL3W wTyWtdFCoTfoIgRQeaARkhnceMX2583Jt9ShPGALCTgQifsrFvgU/DdEOZxYTEIquAsw HrxCZ06UNjYJMftUEHe1ow4Tv6q2XYScigicpVP27au4gdTVa6EeeO+wgmUNMe9cCEog LaNPQCCahp25YO89ePuDfYwQXExsNtfJ7zTvd1EnsoPpeBtfm+oghEapmUp893sivQJM 0+clHCPHG1Hnj1tLQRTLevMmypFLA7Tn8AWn71fXIYRoOpq4aLcl0otIKMQmn6405jAT RNAQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=GzemyWsbe1874/35X2pGE6I7zLC/qObwAXplkSqm2aE=; b=t1WayuGkOoheymqNuhh8lG7mlKyyu9Ho78mFWlUviWQ0PFSK/XjSTSm5kylbJCd2ts 4eH8Chm+5C8r5tllGbFy5NBZjLtiV7ykA37/cF0I5n2YwgEungfznynSvJ0GBoPiqEUh aMR3f4EFR1T0XDkfoOHZnvcE9N3l+V+nbfXmZy/I0I+t7CW1Rn7qJSNny1QwLQdUqlX8 cAcX8e6DAivPWPz91OIa4N/7FQZyg10g+S74pzOZMRnvtgUmHTKVuYc6XQdDAemCKGVg NdHiyv5iDHNNAcKRTmY6RidYBcIWL2iTd68eyxV3wiPWobDqGOS79JsQ7iMuNN4vmAR4 0iwA== X-Gm-Message-State: AO0yUKVdZaXnOVS12tLYPLCl5MzN2HXF9ZLcc1eT6GBaJocQg+vQpEK8 BWA8P7hrQJOpY8p4I0nvBtQblIjlSy57F9g= X-Google-Smtp-Source: AK7set+0IxdeFoc+Kn+E3OD6+a3ZeegbPKAGCsgRpOcmEvW2y10wLjL8U1hVM8p0ddZt3HY7VH3NvMmLcJc1hoM= X-Received: from saravanak.san.corp.google.com ([2620:15c:2d:3:ae1:aba6:f21c:4a94]) (user=saravanak job=sendgmr) by 2002:a17:90a:148:b0:230:e030:844f with SMTP id z8-20020a17090a014800b00230e030844fmr409952pje.77.1675734143942; Mon, 06 Feb 2023 17:42:23 -0800 (PST) Date: Mon, 6 Feb 2023 17:41:57 -0800 In-Reply-To: <20230207014207.1678715-1-saravanak@google.com> Message-Id: <20230207014207.1678715-6-saravanak@google.com> Mime-Version: 1.0 References: <20230207014207.1678715-1-saravanak@google.com> X-Mailer: git-send-email 2.39.1.519.gcb327c4b5f-goog Subject: [PATCH v3 05/12] driver core: fw_devlink: Add DL_FLAG_CYCLE support to device links From: Saravana Kannan To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Sudeep Holla , Cristian Marussi , Linus Walleij , Bartosz Golaszewski , Thomas Gleixner , Marc Zyngier , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Frank Rowand , Geert Uytterhoeven , Magnus Damm , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Len Brown , Saravana Kannan , " =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= " Cc: Abel Vesa , Alexander Stein , Tony Lindgren , Geert Uytterhoeven , John Stultz , Doug Anderson , Guenter Roeck , Dmitry Baryshkov , Maxim Kiselev , Maxim Kochetkov , Luca Weiss , Colin Foster , Martin Kepplinger , Jean-Philippe Brucker , Vladimir Oltean , kernel-team@android.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-acpi@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org fw_devlink uses DL_FLAG_SYNC_STATE_ONLY device link flag for two purposes: 1. To allow a parent device to proxy its child device's dependency on a supplier so that the supplier doesn't get its sync_state() callback before the child device/consumer can be added and probed. In this usage scenario, we need to ignore cycles for ensure correctness of sync_state() callbacks. 2. When there are dependency cycles in firmware, we don't know which of those dependencies are valid. So, we have to ignore them all wrt probe ordering while still making sure the sync_state() callbacks come correctly. However, when detecting dependency cycles, there can be multiple dependency cycles between two devices that we need to detect. For example: A -> B -> A and A -> C -> B -> A. To detect multiple cycles correct, we need to be able to differentiate DL_FLAG_SYNC_STATE_ONLY device links used for (1) vs (2) above. To allow this differentiation, add a DL_FLAG_CYCLE that can be use to mark use case (2). We can then use the DL_FLAG_CYCLE to decide which DL_FLAG_SYNC_STATE_ONLY device links to follow when looking for dependency cycles. Fixes: 2de9d8e0d2fe ("driver core: fw_devlink: Improve handling of cyclic dependencies") Signed-off-by: Saravana Kannan Tested-by: Colin Foster Tested-by: Sudeep Holla --- drivers/base/core.c | 28 ++++++++++++++++++---------- include/linux/device.h | 1 + 2 files changed, 19 insertions(+), 10 deletions(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index 368bfd96b511..071c454844d6 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -322,6 +322,12 @@ static bool device_is_ancestor(struct device *dev, struct device *target) return false; } +static inline bool device_link_flag_is_sync_state_only(u32 flags) +{ + return (flags & ~(DL_FLAG_INFERRED | DL_FLAG_CYCLE)) == + (DL_FLAG_SYNC_STATE_ONLY | DL_FLAG_MANAGED); +} + /** * device_is_dependent - Check if one device depends on another one * @dev: Device to check dependencies for. @@ -348,8 +354,7 @@ int device_is_dependent(struct device *dev, void *target) return ret; list_for_each_entry(link, &dev->links.consumers, s_node) { - if ((link->flags & ~DL_FLAG_INFERRED) == - (DL_FLAG_SYNC_STATE_ONLY | DL_FLAG_MANAGED)) + if (device_link_flag_is_sync_state_only(link->flags)) continue; if (link->consumer == target) @@ -422,8 +427,7 @@ static int device_reorder_to_tail(struct device *dev, void *not_used) device_for_each_child(dev, NULL, device_reorder_to_tail); list_for_each_entry(link, &dev->links.consumers, s_node) { - if ((link->flags & ~DL_FLAG_INFERRED) == - (DL_FLAG_SYNC_STATE_ONLY | DL_FLAG_MANAGED)) + if (device_link_flag_is_sync_state_only(link->flags)) continue; device_reorder_to_tail(link->consumer, NULL); } @@ -684,7 +688,8 @@ postcore_initcall(devlink_class_init); DL_FLAG_AUTOREMOVE_SUPPLIER | \ DL_FLAG_AUTOPROBE_CONSUMER | \ DL_FLAG_SYNC_STATE_ONLY | \ - DL_FLAG_INFERRED) + DL_FLAG_INFERRED | \ + DL_FLAG_CYCLE) #define DL_ADD_VALID_FLAGS (DL_MANAGED_LINK_FLAGS | DL_FLAG_STATELESS | \ DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE) @@ -753,8 +758,6 @@ struct device_link *device_link_add(struct device *consumer, if (!consumer || !supplier || consumer == supplier || flags & ~DL_ADD_VALID_FLAGS || (flags & DL_FLAG_STATELESS && flags & DL_MANAGED_LINK_FLAGS) || - (flags & DL_FLAG_SYNC_STATE_ONLY && - (flags & ~DL_FLAG_INFERRED) != DL_FLAG_SYNC_STATE_ONLY) || (flags & DL_FLAG_AUTOPROBE_CONSUMER && flags & (DL_FLAG_AUTOREMOVE_CONSUMER | DL_FLAG_AUTOREMOVE_SUPPLIER))) @@ -770,6 +773,10 @@ struct device_link *device_link_add(struct device *consumer, if (!(flags & DL_FLAG_STATELESS)) flags |= DL_FLAG_MANAGED; + if (flags & DL_FLAG_SYNC_STATE_ONLY && + !device_link_flag_is_sync_state_only(flags)) + return NULL; + device_links_write_lock(); device_pm_lock(); @@ -1729,7 +1736,7 @@ static void fw_devlink_relax_link(struct device_link *link) if (!(link->flags & DL_FLAG_INFERRED)) return; - if (link->flags == (DL_FLAG_MANAGED | FW_DEVLINK_FLAGS_PERMISSIVE)) + if (device_link_flag_is_sync_state_only(link->flags)) return; pm_runtime_drop_link(link); @@ -1853,8 +1860,8 @@ static int fw_devlink_relax_cycle(struct device *con, void *sup) return ret; list_for_each_entry(link, &con->links.consumers, s_node) { - if ((link->flags & ~DL_FLAG_INFERRED) == - (DL_FLAG_SYNC_STATE_ONLY | DL_FLAG_MANAGED)) + if (!(link->flags & DL_FLAG_CYCLE) && + device_link_flag_is_sync_state_only(link->flags)) continue; if (!fw_devlink_relax_cycle(link->consumer, sup)) @@ -1863,6 +1870,7 @@ static int fw_devlink_relax_cycle(struct device *con, void *sup) ret = 1; fw_devlink_relax_link(link); + link->flags |= DL_FLAG_CYCLE; } return ret; } diff --git a/include/linux/device.h b/include/linux/device.h index 44e3acae7b36..f4d20655d2d7 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -328,6 +328,7 @@ enum device_link_state { #define DL_FLAG_MANAGED BIT(6) #define DL_FLAG_SYNC_STATE_ONLY BIT(7) #define DL_FLAG_INFERRED BIT(8) +#define DL_FLAG_CYCLE BIT(9) /** * enum dl_dev_state - Device driver presence tracking information. From patchwork Tue Feb 7 01:41:58 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saravana Kannan X-Patchwork-Id: 13130858 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0FAB3C05027 for ; Tue, 7 Feb 2023 01:43:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230491AbjBGBnE (ORCPT ); Mon, 6 Feb 2023 20:43:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41468 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230407AbjBGBmq (ORCPT ); Mon, 6 Feb 2023 20:42:46 -0500 Received: from mail-pf1-x449.google.com (mail-pf1-x449.google.com [IPv6:2607:f8b0:4864:20::449]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D13BB16AC7 for ; Mon, 6 Feb 2023 17:42:27 -0800 (PST) Received: by mail-pf1-x449.google.com with SMTP id 144-20020a621896000000b0059e73803cdcso3164754pfy.12 for ; Mon, 06 Feb 2023 17:42:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=7vpmPQ8JVcoFw6jzJt0l+ZlsP/nzUPWiHo9dJCqmqxg=; b=ZVUxcLXcuHpH7fPEW4j4omclrdQvGfH8R1Vewn8I0GThoas9mW+GLo2sjSyOKV3npY DsGQu11CHb6WnNb+y3GZPqWhQ6O3cz3xiYf037/sdq9nFz8XU64plVHqi0wGnHI/rnh2 kDoKcQ3viwNlT96/A4ZecaIDJZMX2kMBpfxVlyPZFeajMa66cDDL9Mb1Ds/7UEUQwtJK R/Xs8z5ijn/Nd67K7O2YD2iruYwx4Q9hECaWntP7FJqQKrMrH+xfnF9gGv9X3lbFtL8X HEmJDslkFRhae3S1tV11iNbb6wmW0J8xAcXwhzislt+Z//qMzPcwqA3I9SL4dXDTfs2E DxQA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=7vpmPQ8JVcoFw6jzJt0l+ZlsP/nzUPWiHo9dJCqmqxg=; b=5Ac64JTv+uDL+4vPuXWkiPglUvdmmBoppi9efEBEbJq7TztH1X7EKHNDAnVJhgkLq+ vJ2lgi5ptabAV4kEHkDl1Vk5S0FU2vTOn9j1/BeQaMeG/19otIxf3TqX+2poRnRicmVP FDFpD+ssT4fI1Wb5HHya7bTTUfBB5KcWM81H7wwHUHbjpzbyh/VLR/cF8doEeSgp4gL9 TRMgmgWxXvnFLVcUbkiXVhxP7MA9oZ9jEp257L6E5955SI8o4dKpEJtPTsrwfImc7GaY T/lOVqhISHGj8fr/WgCdmvRkSdbLl0qTaZXSQRJ1LLiiQ14ypmlTSE5i8sz0LL3wQ7C4 /Pzg== X-Gm-Message-State: AO0yUKWvpBvK64t2ibCLS9FpMv+bGWvWAoPK1R/j+ixAhlUbllptpvwk 6PDZ4uTHuaE0/D07xK9gwlykSR/8Q/M/sHY= X-Google-Smtp-Source: AK7set9NPOGC0oetOP/gaLFUP+MpzpqBfkZ8gulYNDZYMwFtOcGmzB6taII+HbQld9AZdrAJI3zqaMUoDmkG+Fo= X-Received: from saravanak.san.corp.google.com ([2620:15c:2d:3:ae1:aba6:f21c:4a94]) (user=saravanak job=sendgmr) by 2002:a17:90a:49c8:b0:230:9fa1:8cbb with SMTP id l8-20020a17090a49c800b002309fa18cbbmr1636995pjm.78.1675734146756; Mon, 06 Feb 2023 17:42:26 -0800 (PST) Date: Mon, 6 Feb 2023 17:41:58 -0800 In-Reply-To: <20230207014207.1678715-1-saravanak@google.com> Message-Id: <20230207014207.1678715-7-saravanak@google.com> Mime-Version: 1.0 References: <20230207014207.1678715-1-saravanak@google.com> X-Mailer: git-send-email 2.39.1.519.gcb327c4b5f-goog Subject: [PATCH v3 06/12] driver core: fw_devlink: Allow marking a fwnode link as being part of a cycle From: Saravana Kannan To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Sudeep Holla , Cristian Marussi , Linus Walleij , Bartosz Golaszewski , Thomas Gleixner , Marc Zyngier , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Frank Rowand , Geert Uytterhoeven , Magnus Damm , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Len Brown , Saravana Kannan , " =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= " Cc: Abel Vesa , Alexander Stein , Tony Lindgren , Geert Uytterhoeven , John Stultz , Doug Anderson , Guenter Roeck , Dmitry Baryshkov , Maxim Kiselev , Maxim Kochetkov , Luca Weiss , Colin Foster , Martin Kepplinger , Jean-Philippe Brucker , Vladimir Oltean , kernel-team@android.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-acpi@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org 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 Tested-by: Colin Foster Tested-by: Sudeep Holla --- drivers/base/core.c | 50 +++++++++++++++++++++++++++++++++--------- include/linux/fwnode.h | 11 +++++++++- 2 files changed, 50 insertions(+), 11 deletions(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index 071c454844d6..4869b6fdfeaf 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -76,13 +76,15 @@ static bool fw_devlink_best_effort; * are ignored and there is no reference counting. */ static int __fwnode_link_add(struct fwnode_handle *con, - struct fwnode_handle *sup) + struct fwnode_handle *sup, u8 flags) { struct fwnode_link *link; list_for_each_entry(link, &sup->consumers, s_hook) - if (link->consumer == con) + if (link->consumer == con) { + link->flags |= flags; return 0; + } link = kzalloc(sizeof(*link), GFP_KERNEL); if (!link) @@ -92,6 +94,7 @@ static int __fwnode_link_add(struct fwnode_handle *con, INIT_LIST_HEAD(&link->s_hook); link->consumer = con; INIT_LIST_HEAD(&link->c_hook); + link->flags = flags; list_add(&link->s_hook, &sup->consumers); list_add(&link->c_hook, &con->suppliers); @@ -106,7 +109,7 @@ int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup) int ret; mutex_lock(&fwnode_link_lock); - ret = __fwnode_link_add(con, sup); + ret = __fwnode_link_add(con, sup, 0); mutex_unlock(&fwnode_link_lock); return ret; } @@ -126,6 +129,19 @@ 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 @@ -199,7 +215,7 @@ static void __fwnode_links_move_consumers(struct fwnode_handle *from, struct fwnode_link *link, *tmp; list_for_each_entry_safe(link, tmp, &from->consumers, s_hook) { - __fwnode_link_add(link->consumer, to); + __fwnode_link_add(link->consumer, to, link->flags); __fwnode_link_del(link); } } @@ -1041,6 +1057,21 @@ 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)) + return link->supplier; + + return NULL; +} + /** * device_links_check_suppliers - Check presence of supplier drivers. * @dev: Consumer device. @@ -1068,11 +1099,8 @@ 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 +1289,9 @@ 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; }; /** From patchwork Tue Feb 7 01:41:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saravana Kannan X-Patchwork-Id: 13130859 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D9C23C05027 for ; Tue, 7 Feb 2023 01:43:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230503AbjBGBnU (ORCPT ); Mon, 6 Feb 2023 20:43:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41058 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229478AbjBGBmv (ORCPT ); Mon, 6 Feb 2023 20:42:51 -0500 Received: from mail-pj1-x104a.google.com (mail-pj1-x104a.google.com [IPv6:2607:f8b0:4864:20::104a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AC726360BD for ; Mon, 6 Feb 2023 17:42:30 -0800 (PST) Received: by mail-pj1-x104a.google.com with SMTP id qb3-20020a17090b280300b002307b2547b5so135759pjb.1 for ; Mon, 06 Feb 2023 17:42:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=JGHkdwcUfLjfQ2SnsdEOolH8s6ejvGtumPkNayiDgT8=; b=cmJIPfjh2AT7clgu/AcVdJaljQV0PRWLl0KlermC6ZkWT+Ktm1K8V1Irljae7Bq8Fd GbMsUz601iHCeLXt4v0Rnf+ruid/MJUPH3GyDn0qe5TYc01L/zU3AL0CiSXNq1mNWjTP qE08lD8A69+o55t4ttKFQVGkWdLDRR8RChew8VuR1jgPsH29lSPfBKrH1qLMmzlD69Rx RerElbokUWXmYixLrXoTaVym2o+myHxz/3QHu0Xwx3AQe5+HEcLgMIGCNNDKIwLCqPXY y2wwvn6c/RMBhyRh+SXPpusHhU9Q8LtVjjKcpVYhLKb5nc+g+TuZKIzFEEnmrOG2qcUI 9knA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=JGHkdwcUfLjfQ2SnsdEOolH8s6ejvGtumPkNayiDgT8=; b=u+nB1pd4sG69PiTkI6QBD/GqQ8KVQd5+mJ5Mo6Y3X4/IE1AKWohRYECcjhxqtRMtPd glEcqgYYIMGxJyutth8MnGEsxqbcF4Yii89sXR6ev7NUTPjjZn6czBH4JP7jFSB7ccgj kjQK6wip6o9HnRx1L/VXkwPSDTDoVKZS2i/DfIxMM4N/a7nVgCoTxsgvvDwNnrjJRPoT oH6563jNPQ1nQC8FmI6jdG8T7CxrfKjVpxVCor7GepUoTa5o00iqO0ulWilmESpsYFRr fLJnsDPq0IDNdy/ZL7uVtQgjfG6QImx6PN8C1hnRD3PlICtNzBWCns+mgjilUzwPZ4Hu seOw== X-Gm-Message-State: AO0yUKVPiuD0+Z5pZuoM/mS5PxJPNOkQH1Leh6xGQ7UUe7A4tRFiHSte CpKA/jXOAlp9I4ITn8ORRgqhm4dm4lbFxMM= X-Google-Smtp-Source: AK7set+tPnBqk0Wq06gNiBk48vsYJFP2q19C+ua9C9YCIEMT4/WAsanOpJamvGVlOlVgWMjXunH03PJr6mwa1NE= X-Received: from saravanak.san.corp.google.com ([2620:15c:2d:3:ae1:aba6:f21c:4a94]) (user=saravanak job=sendgmr) by 2002:a17:90a:55c7:b0:230:9d6c:5e96 with SMTP id o7-20020a17090a55c700b002309d6c5e96mr425362pjm.100.1675734149506; Mon, 06 Feb 2023 17:42:29 -0800 (PST) Date: Mon, 6 Feb 2023 17:41:59 -0800 In-Reply-To: <20230207014207.1678715-1-saravanak@google.com> Message-Id: <20230207014207.1678715-8-saravanak@google.com> Mime-Version: 1.0 References: <20230207014207.1678715-1-saravanak@google.com> X-Mailer: git-send-email 2.39.1.519.gcb327c4b5f-goog Subject: [PATCH v3 07/12] driver core: fw_devlink: Consolidate device link flag computation From: Saravana Kannan To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Sudeep Holla , Cristian Marussi , Linus Walleij , Bartosz Golaszewski , Thomas Gleixner , Marc Zyngier , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Frank Rowand , Geert Uytterhoeven , Magnus Damm , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Len Brown , Saravana Kannan , " =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= " Cc: Abel Vesa , Alexander Stein , Tony Lindgren , Geert Uytterhoeven , John Stultz , Doug Anderson , Guenter Roeck , Dmitry Baryshkov , Maxim Kiselev , Maxim Kochetkov , Luca Weiss , Colin Foster , Martin Kepplinger , Jean-Philippe Brucker , Vladimir Oltean , kernel-team@android.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-acpi@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Consolidate the code that computes the flags to be used when creating a device link from a fwnode link. Fixes: 2de9d8e0d2fe ("driver core: fw_devlink: Improve handling of cyclic dependencies") Signed-off-by: Saravana Kannan Tested-by: Colin Foster Tested-by: Sudeep Holla --- drivers/base/core.c | 28 +++++++++++++++------------- include/linux/fwnode.h | 1 - 2 files changed, 15 insertions(+), 14 deletions(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index 4869b6fdfeaf..e4b60436a4a4 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -1727,8 +1727,11 @@ static int __init fw_devlink_strict_setup(char *arg) } early_param("fw_devlink.strict", fw_devlink_strict_setup); -u32 fw_devlink_get_flags(void) +static inline u32 fw_devlink_get_flags(u8 fwlink_flags) { + if (fwlink_flags & FWLINK_FLAG_CYCLE) + return FW_DEVLINK_FLAGS_PERMISSIVE | DL_FLAG_CYCLE; + return fw_devlink_flags; } @@ -1938,7 +1941,7 @@ static bool fwnode_ancestor_init_without_drv(struct fwnode_handle *fwnode) * fw_devlink_create_devlink - Create a device link from a consumer to fwnode * @con: consumer device for the device link * @sup_handle: fwnode handle of supplier - * @flags: devlink flags + * @link: fwnode link that's being converted to a device link * * This function will try to create a device link between the consumer device * @con and the supplier device represented by @sup_handle. @@ -1955,10 +1958,17 @@ static bool fwnode_ancestor_init_without_drv(struct fwnode_handle *fwnode) * possible to do that in the future */ static int fw_devlink_create_devlink(struct device *con, - struct fwnode_handle *sup_handle, u32 flags) + struct fwnode_handle *sup_handle, + struct fwnode_link *link) { struct device *sup_dev; int ret = 0; + u32 flags; + + if (con->fwnode == link->consumer) + flags = fw_devlink_get_flags(link->flags); + else + flags = FW_DEVLINK_FLAGS_PERMISSIVE; /* * In some cases, a device P might also be a supplier to its child node @@ -2091,7 +2101,6 @@ static void __fw_devlink_link_to_consumers(struct device *dev) struct fwnode_link *link, *tmp; list_for_each_entry_safe(link, tmp, &fwnode->consumers, s_hook) { - u32 dl_flags = fw_devlink_get_flags(); struct device *con_dev; bool own_link = true; int ret; @@ -2121,14 +2130,13 @@ static void __fw_devlink_link_to_consumers(struct device *dev) con_dev = NULL; } else { own_link = false; - dl_flags = FW_DEVLINK_FLAGS_PERMISSIVE; } } if (!con_dev) continue; - ret = fw_devlink_create_devlink(con_dev, fwnode, dl_flags); + ret = fw_devlink_create_devlink(con_dev, fwnode, link); put_device(con_dev); if (!own_link || ret == -EAGAIN) continue; @@ -2169,19 +2177,13 @@ static void __fw_devlink_link_to_suppliers(struct device *dev, bool own_link = (dev->fwnode == fwnode); struct fwnode_link *link, *tmp; struct fwnode_handle *child = NULL; - u32 dl_flags; - - if (own_link) - dl_flags = fw_devlink_get_flags(); - else - dl_flags = FW_DEVLINK_FLAGS_PERMISSIVE; list_for_each_entry_safe(link, tmp, &fwnode->suppliers, c_hook) { int ret; struct device *sup_dev; struct fwnode_handle *sup = link->supplier; - ret = fw_devlink_create_devlink(dev, sup, dl_flags); + ret = fw_devlink_create_devlink(dev, sup, link); if (!own_link || ret == -EAGAIN) continue; diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h index fdf2ee0285b7..5700451b300f 100644 --- a/include/linux/fwnode.h +++ b/include/linux/fwnode.h @@ -207,7 +207,6 @@ static inline void fwnode_dev_initialized(struct fwnode_handle *fwnode, fwnode->flags &= ~FWNODE_FLAG_INITIALIZED; } -extern u32 fw_devlink_get_flags(void); extern bool fw_devlink_is_strict(void); int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup); void fwnode_links_purge(struct fwnode_handle *fwnode); From patchwork Tue Feb 7 01:42:00 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saravana Kannan X-Patchwork-Id: 13130860 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2011BC61DA4 for ; Tue, 7 Feb 2023 01:43:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230375AbjBGBnb (ORCPT ); Mon, 6 Feb 2023 20:43:31 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41110 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230380AbjBGBnB (ORCPT ); Mon, 6 Feb 2023 20:43:01 -0500 Received: from mail-pg1-x54a.google.com (mail-pg1-x54a.google.com [IPv6:2607:f8b0:4864:20::54a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C9111360A1 for ; Mon, 6 Feb 2023 17:42:32 -0800 (PST) Received: by mail-pg1-x54a.google.com with SMTP id b21-20020a63d815000000b004e22b1adc26so6039731pgh.21 for ; Mon, 06 Feb 2023 17:42:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=hRJNJ021j7UgZ8yd2Te0gTbEExX2Q8vfI2YN74+S+Pk=; b=dNDuUGRBP6AHiDwbpmxQqlp5/eMem+cgKsBSstj04w5Bsq+orHEudVsHqovBJORYTD lDim37xAo+som1CvlE+uWlC5Wi3dO7dR/p372KByV/Rf81Et/iNkZgwEpriQTuskTcoZ FkT+rliRLGZaodn9xQ+a02TAQE3jwJ8WQssWp0Xlisqa6QXLET3Hx9LzqafJtwQ4YdI7 FEtQL0oq01J2gNcCminYJYVwK+sL8QegmmG3kCUgRPPPGJq4UdbIH0DkEfmQ4i8LM+B3 rkGkVMHqexDkL320QfVBECH7FMSBy7rTsmZg0oSpnNO5gE5wZ1VOPKZBlEzsYIqfaCAz MPKA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=hRJNJ021j7UgZ8yd2Te0gTbEExX2Q8vfI2YN74+S+Pk=; b=1Edw6ctQS9WJ2kZBdSFxd9s4gq8zrxaHM3niMgtw+8VOTfPgSI5JXH6Xs87cfd9y1W ehLB7wGR+CHS4ww12JrelIE4syOzR7PA4LbLqdZJwiNHls8hVfvyGEku0SmgqOicCsnt fLGLsmtKVF1ZaXa8aEHbfMKfR5g3vMAYxm5LRbRDq5EKrpXxifsKe56wmRB4sQI7/jBh Wj2jE82gV5bt8+OudIf9goZX/RaUqcNW52Zb1qklZ7N7IhO6RT8I4ZY7OQxFwBpjwrIo nlPoc392LI2vrbD3h09wstocztDq1YSXVoxfTQ53sCp6HGYxi3Dg1MDar8vEyvtqE3R2 5diA== X-Gm-Message-State: AO0yUKWir6WZC1mAulgPokWOx2zxZFIL4AVVWl2C313V1og3OeSXKiN1 aP18GHwMHFxiPM1fvKbBVU7uoo8Q6MIFseQ= X-Google-Smtp-Source: AK7set+JD8rPeC2hegH4ejuI8kh9p9ED2NDjDjOz59Trt1oxF7eZ1XZzrFKU8beum79ewrCq/mRBfrIqCq4zX2k= X-Received: from saravanak.san.corp.google.com ([2620:15c:2d:3:ae1:aba6:f21c:4a94]) (user=saravanak job=sendgmr) by 2002:a63:9259:0:b0:4db:2ad4:5997 with SMTP id s25-20020a639259000000b004db2ad45997mr169546pgn.29.1675734152305; Mon, 06 Feb 2023 17:42:32 -0800 (PST) Date: Mon, 6 Feb 2023 17:42:00 -0800 In-Reply-To: <20230207014207.1678715-1-saravanak@google.com> Message-Id: <20230207014207.1678715-9-saravanak@google.com> Mime-Version: 1.0 References: <20230207014207.1678715-1-saravanak@google.com> X-Mailer: git-send-email 2.39.1.519.gcb327c4b5f-goog Subject: [PATCH v3 08/12] driver core: fw_devlink: Make cycle detection more robust From: Saravana Kannan To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Sudeep Holla , Cristian Marussi , Linus Walleij , Bartosz Golaszewski , Thomas Gleixner , Marc Zyngier , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Frank Rowand , Geert Uytterhoeven , Magnus Damm , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Len Brown , Saravana Kannan , " =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= " Cc: Abel Vesa , Alexander Stein , Tony Lindgren , Geert Uytterhoeven , John Stultz , Doug Anderson , Guenter Roeck , Dmitry Baryshkov , Maxim Kiselev , Maxim Kochetkov , Luca Weiss , Colin Foster , Martin Kepplinger , Jean-Philippe Brucker , Vladimir Oltean , kernel-team@android.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-acpi@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org fw_devlink could only detect a single and simple cycle because it relied mainly on device link cycle detection code that only checked for cycles between devices. The expectation was that the firmware wouldn't have complicated cycles and multiple cycles between devices. That expectation has been proven to be wrong. For example, fw_devlink could handle: +-+ +-+ |A+------> |B+ +-+ +++ ^ | | | +----------+ But it couldn't handle even something as "simple" as: +---------------------+ | | v | +-+ +-+ +++ |A+------> |B+------> |C| +-+ +++ +-+ ^ | | | +----------+ But firmware has even more complicated cycles like: +---------------------+ | | v | +-+ +---+ +++ +--+A+------>| B +-----> |C|<--+ | +-+ ++--+ +++ | | ^ | ^ | | | | | | | | | +---------+ +---------+ | | | +------------------------------+ And this is without including parent child dependencies or nodes in the cycle that are just firmware nodes that'll never have a struct device created for them. The proper way to treat these devices it to not force any probe ordering between them, while still enforce dependencies between node in the cycles (A, B and C) and their consumers. So this patch goes all out and just deals with all types of cycles. It does this by: 1. Following dependencies across device links, parent-child and fwnode links. 2. When it find cycles, it mark the device links and fwnode links as such instead of just deleting them or making the indistinguishable from proxy SYNC_STATE_ONLY device links. This way, when new nodes get added, we can immediately find and mark any new cycles whether the new node is a device or firmware node. Fixes: 2de9d8e0d2fe ("driver core: fw_devlink: Improve handling of cyclic dependencies") Signed-off-by: Saravana Kannan Tested-by: Colin Foster Tested-by: Sudeep Holla --- drivers/base/core.c | 248 +++++++++++++++++++++++--------------------- 1 file changed, 129 insertions(+), 119 deletions(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index e4b60436a4a4..aaf79ea9647c 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -1866,47 +1866,6 @@ static void fw_devlink_unblock_consumers(struct device *dev) device_links_write_unlock(); } -/** - * fw_devlink_relax_cycle - Convert cyclic links to SYNC_STATE_ONLY links - * @con: Device to check dependencies for. - * @sup: Device to check against. - * - * Check if @sup depends on @con or any device dependent on it (its child or - * its consumer etc). When such a cyclic dependency is found, convert all - * device links created solely by fw_devlink into SYNC_STATE_ONLY device links. - * This is the equivalent of doing fw_devlink=permissive just between the - * devices in the cycle. We need to do this because, at this point, fw_devlink - * can't tell which of these dependencies is not a real dependency. - * - * Return 1 if a cycle is found. Otherwise, return 0. - */ -static int fw_devlink_relax_cycle(struct device *con, void *sup) -{ - struct device_link *link; - int ret; - - if (con == sup) - return 1; - - ret = device_for_each_child(con, sup, fw_devlink_relax_cycle); - if (ret) - return ret; - - list_for_each_entry(link, &con->links.consumers, s_node) { - if (!(link->flags & DL_FLAG_CYCLE) && - device_link_flag_is_sync_state_only(link->flags)) - continue; - - if (!fw_devlink_relax_cycle(link->consumer, sup)) - continue; - - ret = 1; - - fw_devlink_relax_link(link); - link->flags |= DL_FLAG_CYCLE; - } - return ret; -} static bool fwnode_init_without_drv(struct fwnode_handle *fwnode) { @@ -1937,6 +1896,111 @@ static bool fwnode_ancestor_init_without_drv(struct fwnode_handle *fwnode) return false; } +/** + * __fw_devlink_relax_cycles - Relax and mark dependency cycles. + * @con: Potential consumer device. + * @sup_handle: Potential supplier's fwnode. + * + * Needs to be called with fwnode_lock and device link lock held. + * + * Check if @sup_handle or any of its ancestors or suppliers direct/indirectly + * depend on @con. This function can detect multiple cyles between @sup_handle + * and @con. When such dependency cycles are found, convert all device links + * created solely by fw_devlink into SYNC_STATE_ONLY device links. Also, mark + * all fwnode links in the cycle with FWLINK_FLAG_CYCLE so that when they are + * converted into a device link in the future, they are created as + * SYNC_STATE_ONLY device links. This is the equivalent of doing + * fw_devlink=permissive just between the devices in the cycle. We need to do + * this because, at this point, fw_devlink can't tell which of these + * dependencies is not a real dependency. + * + * Return true if one or more cycles were found. Otherwise, return false. + */ +static bool __fw_devlink_relax_cycles(struct device *con, + struct fwnode_handle *sup_handle) +{ + struct device *sup_dev = NULL, *par_dev = NULL; + struct fwnode_link *link; + struct device_link *dev_link; + bool ret = false; + + if (!sup_handle) + return false; + + /* + * We aren't trying to find all cycles. Just a cycle between con and + * sup_handle. + */ + if (sup_handle->flags & FWNODE_FLAG_VISITED) + return false; + + sup_handle->flags |= FWNODE_FLAG_VISITED; + + sup_dev = get_dev_from_fwnode(sup_handle); + + /* Termination condition. */ + if (sup_dev == con) { + ret = true; + goto out; + } + + /* + * If sup_dev is bound to a driver and @con hasn't started binding to a + * driver, sup_dev can't be a consumer of @con. So, no need to check + * further. + */ + if (sup_dev && sup_dev->links.status == DL_DEV_DRIVER_BOUND && + con->links.status == DL_DEV_NO_DRIVER) { + ret = false; + goto out; + } + + list_for_each_entry(link, &sup_handle->suppliers, c_hook) { + if (__fw_devlink_relax_cycles(con, link->supplier)) { + __fwnode_link_cycle(link); + ret = true; + } + } + + /* + * Give priority to device parent over fwnode parent to account for any + * quirks in how fwnodes are converted to devices. + */ + if (sup_dev) + par_dev = get_device(sup_dev->parent); + else + par_dev = fwnode_get_next_parent_dev(sup_handle); + + if (par_dev && __fw_devlink_relax_cycles(con, par_dev->fwnode)) + ret = true; + + if (!sup_dev) + goto out; + + list_for_each_entry(dev_link, &sup_dev->links.suppliers, c_node) { + /* + * Ignore a SYNC_STATE_ONLY flag only if it wasn't marked as + * such due to a cycle. + */ + if (device_link_flag_is_sync_state_only(dev_link->flags) && + !(dev_link->flags & DL_FLAG_CYCLE)) + continue; + + if (__fw_devlink_relax_cycles(con, + dev_link->supplier->fwnode)) { + fw_devlink_relax_link(dev_link); + dev_link->flags |= DL_FLAG_CYCLE; + ret = true; + } + } + +out: + sup_handle->flags &= ~FWNODE_FLAG_VISITED; + put_device(sup_dev); + put_device(par_dev); + return ret; +} + /** * fw_devlink_create_devlink - Create a device link from a consumer to fwnode * @con: consumer device for the device link @@ -1989,6 +2053,21 @@ static int fw_devlink_create_devlink(struct device *con, fwnode_is_ancestor_of(sup_handle, con->fwnode)) return -EINVAL; + /* + * SYNC_STATE_ONLY device links don't block probing and supports cycles. + * So cycle detection isn't necessary and shouldn't be done. + */ + if (!(flags & DL_FLAG_SYNC_STATE_ONLY)) { + device_links_write_lock(); + if (__fw_devlink_relax_cycles(con, sup_handle)) { + __fwnode_link_cycle(link); + flags = fw_devlink_get_flags(link->flags); + dev_info(con, "Fixed dependency cycle(s) with %pfwf\n", + sup_handle); + } + device_links_write_unlock(); + } + if (sup_handle->flags & FWNODE_FLAG_NOT_DEVICE) sup_dev = fwnode_get_next_parent_dev(sup_handle); else @@ -2002,23 +2081,16 @@ static int fw_devlink_create_devlink(struct device *con, */ if (sup_dev->links.status == DL_DEV_NO_DRIVER && sup_handle->flags & FWNODE_FLAG_INITIALIZED) { + dev_dbg(con, + "Not linking %pfwf - dev might never probe\n", + sup_handle); ret = -EINVAL; goto out; } - /* - * If this fails, it is due to cycles in device links. Just - * give up on this link and treat it as invalid. - */ - if (!device_link_add(con, sup_dev, flags) && - !(flags & DL_FLAG_SYNC_STATE_ONLY)) { - dev_info(con, "Fixing up cyclic dependency with %s\n", - dev_name(sup_dev)); - device_links_write_lock(); - fw_devlink_relax_cycle(con, sup_dev); - device_links_write_unlock(); - device_link_add(con, sup_dev, - FW_DEVLINK_FLAGS_PERMISSIVE); + if (!device_link_add(con, sup_dev, flags)) { + dev_err(con, "Failed to create device link with %s\n", + dev_name(sup_dev)); ret = -EINVAL; } @@ -2031,49 +2103,12 @@ static int fw_devlink_create_devlink(struct device *con, */ if (fwnode_init_without_drv(sup_handle) || fwnode_ancestor_init_without_drv(sup_handle)) { - dev_dbg(con, "Not linking %pfwP - Might never probe\n", + dev_dbg(con, "Not linking %pfwf - might never become dev\n", sup_handle); return -EINVAL; } - /* - * DL_FLAG_SYNC_STATE_ONLY doesn't block probing and supports - * cycles. So cycle detection isn't necessary and shouldn't be - * done. - */ - if (flags & DL_FLAG_SYNC_STATE_ONLY) - return -EAGAIN; - - /* - * If we can't find the supplier device from its fwnode, it might be - * due to a cyclic dependency between fwnodes. Some of these cycles can - * be broken by applying logic. Check for these types of cycles and - * break them so that devices in the cycle probe properly. - * - * If the supplier's parent is dependent on the consumer, then the - * consumer and supplier have a cyclic dependency. Since fw_devlink - * can't tell which of the inferred dependencies are incorrect, don't - * enforce probe ordering between any of the devices in this cyclic - * dependency. Do this by relaxing all the fw_devlink device links in - * this cycle and by treating the fwnode link between the consumer and - * the supplier as an invalid dependency. - */ - sup_dev = fwnode_get_next_parent_dev(sup_handle); - if (sup_dev && device_is_dependent(con, sup_dev)) { - dev_info(con, "Fixing up cyclic dependency with %pfwP (%s)\n", - sup_handle, dev_name(sup_dev)); - device_links_write_lock(); - fw_devlink_relax_cycle(con, sup_dev); - device_links_write_unlock(); - ret = -EINVAL; - } else { - /* - * Can't check for cycles or no cycles. So let's try - * again later. - */ - ret = -EAGAIN; - } - + ret = -EAGAIN; out: put_device(sup_dev); return ret; @@ -2156,10 +2191,7 @@ static void __fw_devlink_link_to_consumers(struct device *dev) * * The function creates normal (non-SYNC_STATE_ONLY) device links between @dev * and the real suppliers of @dev. Once these device links are created, the - * fwnode links are deleted. When such device links are successfully created, - * this function is called recursively on those supplier devices. This is - * needed to detect and break some invalid cycles in fwnode links. See - * fw_devlink_create_devlink() for more details. + * fwnode links are deleted. * * In addition, it also looks at all the suppliers of the entire fwnode tree * because some of the child devices of @dev that have not been added yet @@ -2180,7 +2212,6 @@ static void __fw_devlink_link_to_suppliers(struct device *dev, list_for_each_entry_safe(link, tmp, &fwnode->suppliers, c_hook) { int ret; - struct device *sup_dev; struct fwnode_handle *sup = link->supplier; ret = fw_devlink_create_devlink(dev, sup, link); @@ -2188,27 +2219,6 @@ static void __fw_devlink_link_to_suppliers(struct device *dev, continue; __fwnode_link_del(link); - - /* If no device link was created, nothing more to do. */ - if (ret) - continue; - - /* - * If a device link was successfully created to a supplier, we - * now need to try and link the supplier to all its suppliers. - * - * This is needed to detect and delete false dependencies in - * fwnode links that haven't been converted to a device link - * yet. See comments in fw_devlink_create_devlink() for more - * details on the false dependency. - * - * Without deleting these false dependencies, some devices will - * never probe because they'll keep waiting for their false - * dependency fwnode links to be converted to device links. - */ - sup_dev = get_dev_from_fwnode(sup); - __fw_devlink_link_to_suppliers(sup_dev, sup_dev->fwnode); - put_device(sup_dev); } /* From patchwork Tue Feb 7 01:42:01 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saravana Kannan X-Patchwork-Id: 13130861 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id ECC4FC05027 for ; Tue, 7 Feb 2023 01:43:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230461AbjBGBnp (ORCPT ); Mon, 6 Feb 2023 20:43:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41856 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230469AbjBGBnC (ORCPT ); Mon, 6 Feb 2023 20:43:02 -0500 Received: from mail-pf1-x44a.google.com (mail-pf1-x44a.google.com [IPv6:2607:f8b0:4864:20::44a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5AF503644B for ; Mon, 6 Feb 2023 17:42:35 -0800 (PST) Received: by mail-pf1-x44a.google.com with SMTP id c75-20020a621c4e000000b00592501ac524so7258070pfc.6 for ; Mon, 06 Feb 2023 17:42:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=eHkn7URR+Wxf1z7FIYAyiZv9JLKLhxrUf9FZBGK7iDo=; b=X39XxihNmunqazOTpIkjvNwzLVqnqPsFSYGCONP99rFEEJQTw0YZGZIGdZ2G3+9vBn jLSmp7NH6muan+2mAEaSNl5yTC31b7Q5T/udBdAm9llcuJBX5oUbFtMr82F8YTjvEw2Q doJbf8H77vo5qapVNP6ot4Js78tZNZVyzlWLT3b2iKSUDPPQA+szJzHBSQRLwdPsZQW6 I+1EE/BAl9hm3vZvs+d558fqJuGREAMebpGf7PWMwlbfgiVJvDcr+ymp2N4YVKoNN+NW P1oJl3asALANFBOisjnueYBs1keAmZXsNfAhWIe4VBy5tPGQ8fI9v7pI096EUfbmPWQy vqFA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=eHkn7URR+Wxf1z7FIYAyiZv9JLKLhxrUf9FZBGK7iDo=; b=lKdIxAOZPMvFZ9cg/toIDgoxLuBRmHCgJrwRKEI5kUqMxB6QxTJswkAQkzDV+IhzwD YldIIzvI1OUzL7j4b/6LICfzoHoIbjdzAgD7EfPwZ9++j+o9UxScZOVhwFbMrkndOkcf Pz9qY42wbINDmN0Bl1l0LB/12jNpSLIWQoQuInT381pZk9uq3je5Ar1UWfwWZWfPM8Kp bPIXdbCXgaGWiz8/GcQ8bHz4A5vFUT1Uk1AsDfK8SdCmEFnghwVS/rW/rkdei1stxYxz EO913du1n/BuKKRokMuuQPZxDo7+pXHyzyvfw8n254/GJB0p4tP4yzKeVQP3M43Jt/vF nRrg== X-Gm-Message-State: AO0yUKUc634u/pnUFMMBW6UZZDqdXVk9twsPuDeSz3hJDlghl0FJakWp uVxGG3KHYh3AHVAD2DzEfANWrbi1KsQr0kY= X-Google-Smtp-Source: AK7set9gap7iVtj70G9Lb/TrrQyg8mWjZcfTC68UXJ/UbN0WLTioSeWRqcHRtuDY/mEnQb4c6/HizBrhqtXfNvE= X-Received: from saravanak.san.corp.google.com ([2620:15c:2d:3:ae1:aba6:f21c:4a94]) (user=saravanak job=sendgmr) by 2002:a17:90b:198c:b0:230:ebc1:3ab3 with SMTP id mv12-20020a17090b198c00b00230ebc13ab3mr146048pjb.104.1675734154917; Mon, 06 Feb 2023 17:42:34 -0800 (PST) Date: Mon, 6 Feb 2023 17:42:01 -0800 In-Reply-To: <20230207014207.1678715-1-saravanak@google.com> Message-Id: <20230207014207.1678715-10-saravanak@google.com> Mime-Version: 1.0 References: <20230207014207.1678715-1-saravanak@google.com> X-Mailer: git-send-email 2.39.1.519.gcb327c4b5f-goog Subject: [PATCH v3 09/12] of: property: Simplify of_link_to_phandle() From: Saravana Kannan To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Sudeep Holla , Cristian Marussi , Linus Walleij , Bartosz Golaszewski , Thomas Gleixner , Marc Zyngier , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Frank Rowand , Geert Uytterhoeven , Magnus Damm , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Len Brown , Saravana Kannan , " =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= " Cc: Abel Vesa , Alexander Stein , Tony Lindgren , Geert Uytterhoeven , John Stultz , Doug Anderson , Guenter Roeck , Dmitry Baryshkov , Maxim Kiselev , Maxim Kochetkov , Luca Weiss , Colin Foster , Martin Kepplinger , Jean-Philippe Brucker , Vladimir Oltean , kernel-team@android.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-acpi@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org The driver core now: - Has the parent device of a supplier pick up the consumers if the supplier never has a device created for it. - Ignores a supplier if the supplier has no parent device and will never be probed by a driver And already prevents creating a device link with the consumer as a supplier of a parent. So, we no longer need to find the "compatible" node of the supplier or do any other checks in of_link_to_phandle(). We simply need to make sure that the supplier is available in DT. Signed-off-by: Saravana Kannan Tested-by: Colin Foster Tested-by: Sudeep Holla --- drivers/of/property.c | 84 +++++++------------------------------------ 1 file changed, 13 insertions(+), 71 deletions(-) diff --git a/drivers/of/property.c b/drivers/of/property.c index 134cfc980b70..c651aad6f34b 100644 --- a/drivers/of/property.c +++ b/drivers/of/property.c @@ -1062,20 +1062,6 @@ of_fwnode_device_get_match_data(const struct fwnode_handle *fwnode, return of_device_get_match_data(dev); } -static bool of_is_ancestor_of(struct device_node *test_ancestor, - struct device_node *child) -{ - of_node_get(child); - while (child) { - if (child == test_ancestor) { - of_node_put(child); - return true; - } - child = of_get_next_parent(child); - } - return false; -} - static struct device_node *of_get_compat_node(struct device_node *np) { of_node_get(np); @@ -1106,71 +1092,27 @@ static struct device_node *of_get_compat_node_parent(struct device_node *np) return node; } -/** - * of_link_to_phandle - Add fwnode link to supplier from supplier phandle - * @con_np: consumer device tree node - * @sup_np: supplier device tree node - * - * Given a phandle to a supplier device tree node (@sup_np), this function - * finds the device that owns the supplier device tree node and creates a - * device link from @dev consumer device to the supplier device. This function - * doesn't create device links for invalid scenarios such as trying to create a - * link with a parent device as the consumer of its child device. In such - * cases, it returns an error. - * - * Returns: - * - 0 if fwnode link successfully created to supplier - * - -EINVAL if the supplier link is invalid and should not be created - * - -ENODEV if struct device will never be create for supplier - */ -static int of_link_to_phandle(struct device_node *con_np, +static void of_link_to_phandle(struct device_node *con_np, struct device_node *sup_np) { - struct device *sup_dev; - struct device_node *tmp_np = sup_np; + struct device_node *tmp_np = of_node_get(sup_np); - /* - * Find the device node that contains the supplier phandle. It may be - * @sup_np or it may be an ancestor of @sup_np. - */ - sup_np = of_get_compat_node(sup_np); - if (!sup_np) { - pr_debug("Not linking %pOFP to %pOFP - No device\n", - con_np, tmp_np); - return -ENODEV; - } + /* Check that sup_np and its ancestors are available. */ + while (tmp_np) { + if (of_fwnode_handle(tmp_np)->dev) { + of_node_put(tmp_np); + break; + } - /* - * Don't allow linking a device node as a consumer of one of its - * descendant nodes. By definition, a child node can't be a functional - * dependency for the parent node. - */ - if (of_is_ancestor_of(con_np, sup_np)) { - pr_debug("Not linking %pOFP to %pOFP - is descendant\n", - con_np, sup_np); - of_node_put(sup_np); - return -EINVAL; - } + if (!of_device_is_available(tmp_np)) { + of_node_put(tmp_np); + return; + } - /* - * Don't create links to "early devices" that won't have struct devices - * created for them. - */ - sup_dev = get_dev_from_fwnode(&sup_np->fwnode); - if (!sup_dev && - (of_node_check_flag(sup_np, OF_POPULATED) || - sup_np->fwnode.flags & FWNODE_FLAG_NOT_DEVICE)) { - pr_debug("Not linking %pOFP to %pOFP - No struct device\n", - con_np, sup_np); - of_node_put(sup_np); - return -ENODEV; + tmp_np = of_get_next_parent(tmp_np); } - put_device(sup_dev); fwnode_link_add(of_fwnode_handle(con_np), of_fwnode_handle(sup_np)); - of_node_put(sup_np); - - return 0; } /** From patchwork Tue Feb 7 01:42:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saravana Kannan X-Patchwork-Id: 13130869 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DA7AEC05027 for ; Tue, 7 Feb 2023 01:44:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230360AbjBGBoE (ORCPT ); Mon, 6 Feb 2023 20:44:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41072 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230440AbjBGBnU (ORCPT ); Mon, 6 Feb 2023 20:43:20 -0500 Received: from mail-yw1-x114a.google.com (mail-yw1-x114a.google.com [IPv6:2607:f8b0:4864:20::114a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D862736684 for ; Mon, 6 Feb 2023 17:42:49 -0800 (PST) Received: by mail-yw1-x114a.google.com with SMTP id 00721157ae682-52a87fc668cso22679707b3.18 for ; Mon, 06 Feb 2023 17:42:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=6A/x+0p8PMNq+UMi21kh87Q0g2/Jiu6oRRXgMmXymQw=; b=L5SU9yrkdCoQISM+/wTwNBtt9so41vGiUxcF1ahsAlqhPaBFdZ9BDHj5PmwJYCl3t5 yHWeuyzyFi1Vdpek1s61VTHHj+vCMUwdpIlXNVlAwD+q2ZgHmHT68Mgoisp0fKBP+9Ye AKuV+3jXCiNI4TvL5bTaYwjcjvjt6nHSeRli1b16m+nWjdvaQpCaLUzxcHWRE8E5TnS1 d0NPJtXNewRsKNlQC1Z7BIw/LVmY8gig4kKT1UdBbSEKM0EGx8tI2Hg9ZraY7mst5nHt 8sz2cJJNBzpaUhYmCNVGrSD9LOhg+ouviu7qdeJhnsPY9u5+SlS77RJ9No7k5rq3weF9 /HxQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=6A/x+0p8PMNq+UMi21kh87Q0g2/Jiu6oRRXgMmXymQw=; b=CP5lIbUe5aDt6aaSUWMW6D97E3ZCmpavI7eb2SVvPvsGPgOsNMv9Paj/oWujgW2bZe ml3bABYl9XaAT2c2OlIZwmB4l3LM3/hQ9bnKAm8lPYxhFJxxN5VPV+SWkhGSWflBfOWW xtGUCzpICYRqmR5i/MvuxqCENBDRGsn2dwXVTXucpLCxtFl2+jPXGRdve+4fQpJ4qomL 9JE3khDaGINeI6Py0FfVTAnRBWnHAG/BH1VyZavT/9JxCe0m2ocp2ftLJ/8k8Ip8944e O0jccQZeQheKmQDBsbzhzoPvk6Ha5ds5z7HwmLVxhJDhJiCjKaB828BWA5WfO1d8XpOw f+nw== X-Gm-Message-State: AO0yUKUp0HlVuw2mffepZ1tD1ySyGWxz/cIAETUHW/6KO0EmuNOIbF9f NcYIN3bN7KxyA/sQ1kjNRsY7HfRbE2/3VaM= X-Google-Smtp-Source: AK7set+GZlE4Povwj1RwyeX6tO9l13sdnFTxa+J8n89nUczFeQdItr8brE7AhM3WB/T2LWQ/yln8wcGWuiwenUI= X-Received: from saravanak.san.corp.google.com ([2620:15c:2d:3:ae1:aba6:f21c:4a94]) (user=saravanak job=sendgmr) by 2002:a81:6146:0:b0:526:a392:c07e with SMTP id v67-20020a816146000000b00526a392c07emr128848ywb.106.1675734157775; Mon, 06 Feb 2023 17:42:37 -0800 (PST) Date: Mon, 6 Feb 2023 17:42:02 -0800 In-Reply-To: <20230207014207.1678715-1-saravanak@google.com> Message-Id: <20230207014207.1678715-11-saravanak@google.com> Mime-Version: 1.0 References: <20230207014207.1678715-1-saravanak@google.com> X-Mailer: git-send-email 2.39.1.519.gcb327c4b5f-goog Subject: [PATCH v3 10/12] irqchip/irq-imx-gpcv2: Mark fwnode device as not initialized From: Saravana Kannan To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Sudeep Holla , Cristian Marussi , Linus Walleij , Bartosz Golaszewski , Thomas Gleixner , Marc Zyngier , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Frank Rowand , Geert Uytterhoeven , Magnus Damm , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Len Brown , Saravana Kannan , " =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= " Cc: Abel Vesa , Alexander Stein , Tony Lindgren , Geert Uytterhoeven , John Stultz , Doug Anderson , Guenter Roeck , Dmitry Baryshkov , Maxim Kiselev , Maxim Kochetkov , Luca Weiss , Colin Foster , Martin Kepplinger , Jean-Philippe Brucker , Vladimir Oltean , kernel-team@android.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-acpi@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Since this device is only partially initialized by the irqchip driver, we need to mark the fwnode device as not initialized. This is to let fw_devlink know that the device will be completely initialized at a later point. That way, fw_devlink will continue to defer the probe of the power domain consumers till the power domain driver successfully binds to the struct device and completes the initialization of the device. Signed-off-by: Saravana Kannan --- drivers/irqchip/irq-imx-gpcv2.c | 1 + drivers/soc/imx/gpcv2.c | 2 +- 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/irqchip/irq-imx-gpcv2.c b/drivers/irqchip/irq-imx-gpcv2.c index b9c22f764b4d..8a0e82067924 100644 --- a/drivers/irqchip/irq-imx-gpcv2.c +++ b/drivers/irqchip/irq-imx-gpcv2.c @@ -283,6 +283,7 @@ static int __init imx_gpcv2_irqchip_init(struct device_node *node, * later the GPC power domain driver will not be skipped. */ of_node_clear_flag(node, OF_POPULATED); + fwnode_dev_initialized(domain->fwnode, false); return 0; } diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c index 7a47d14fde44..4b3300b090a8 100644 --- a/drivers/soc/imx/gpcv2.c +++ b/drivers/soc/imx/gpcv2.c @@ -1518,7 +1518,7 @@ static int imx_gpcv2_probe(struct platform_device *pdev) domain->genpd.power_off = imx_pgc_power_down; pd_pdev->dev.parent = dev; - pd_pdev->dev.of_node = np; + device_set_node(&pd_pdev->dev, of_fwnode_handle(np)); ret = platform_device_add(pd_pdev); if (ret) { From patchwork Tue Feb 7 01:42:03 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saravana Kannan X-Patchwork-Id: 13130870 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DD82BC61DA4 for ; Tue, 7 Feb 2023 01:44:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230518AbjBGBoG (ORCPT ); Mon, 6 Feb 2023 20:44:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41802 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229954AbjBGBnV (ORCPT ); Mon, 6 Feb 2023 20:43:21 -0500 Received: from mail-pg1-x549.google.com (mail-pg1-x549.google.com [IPv6:2607:f8b0:4864:20::549]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EF76636685 for ; Mon, 6 Feb 2023 17:42:50 -0800 (PST) Received: by mail-pg1-x549.google.com with SMTP id x3-20020a654143000000b004f2f2dafb21so4808952pgp.0 for ; Mon, 06 Feb 2023 17:42:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=qO7SA/IWYPEhdvQ3bg5afBtNBnjngejmFoW2WqOrddI=; b=GazeBruttlU5oTI33IWVV1tAUn4JRdRTAmGz0onik+n6U1T5h3g5Eqk7gGdOGMDK/b pISWVmhqDorcgwiUsTtbwUhwsXkQBy9FbOADGd10qeFLJKcjSWm9FlwkrDf0YSZnQ9+5 MlI9mebazN/CBNgen9ENy7akZji0sNSLpJDHAKCcuu7sotue0FW2RA5Bj0NTsc48DOU1 BJ2j+WUhTu8DoyxWUtbwaehDC8ppns7BWt2T/8qAizu6/ITBGfNfqXYJKkF1ZM6CyRxn ZcscZDUsMpAZKiRckNDj1rDjE8L096aAxpbX+tYBH1Uk2VlibG8o8TaOGQfpibf5qmCu A4Ug== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=qO7SA/IWYPEhdvQ3bg5afBtNBnjngejmFoW2WqOrddI=; b=RWUA765FFTOlZx9p+TyHY3b++f3eGS/avsxDcCeGRGTUUOdisMGreRUIyXyyClvLM/ k78+wYOJA38H+p1ps0tD62eq58aa/bIaUzH2uvzkZ3GLt8Ncv9IyVQ6HbW/Ewm/hQmAT jdGMth5YvnsJBEqI6FulN8rq1IPNVQrGozZ5NwaVNoGlpCWRYri+yMnXz/3GGgZYkP9F eQSxmNmNbxWQx0lhlTAORvdlUZM9NXufwBBrw/wcC/o+Sax0GwsfharNudrsSVTpmiYv MRFht5bQBU6ZhTNZSgpK8wRVDrV2LDBIbwO2zl13rGiSKv7cLjOMJl7uysCloqDGjKg6 yURQ== X-Gm-Message-State: AO0yUKUZNYYSKzthDus15VPf3gWooOFr4pttI+hfcsh+yheF8WPMjo14 jBd9+rT3FhV8UZ9hcaMs6zFU0exknkHG7i8= X-Google-Smtp-Source: AK7set8CF2GrP/NVxAgKrUj8AGlYPMKVoXXaqrQpeXZ8O8WzceQ78vPHdt/Q5BozlBJGRB5LWE1p0PTeySIpdfY= X-Received: from saravanak.san.corp.google.com ([2620:15c:2d:3:ae1:aba6:f21c:4a94]) (user=saravanak job=sendgmr) by 2002:a63:7304:0:b0:4da:d745:98dd with SMTP id o4-20020a637304000000b004dad74598ddmr170930pgc.62.1675734160457; Mon, 06 Feb 2023 17:42:40 -0800 (PST) Date: Mon, 6 Feb 2023 17:42:03 -0800 In-Reply-To: <20230207014207.1678715-1-saravanak@google.com> Message-Id: <20230207014207.1678715-12-saravanak@google.com> Mime-Version: 1.0 References: <20230207014207.1678715-1-saravanak@google.com> X-Mailer: git-send-email 2.39.1.519.gcb327c4b5f-goog Subject: [PATCH v3 11/12] firmware: arm_scmi: Set fwnode for the scmi_device From: Saravana Kannan To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Sudeep Holla , Cristian Marussi , Linus Walleij , Bartosz Golaszewski , Thomas Gleixner , Marc Zyngier , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Frank Rowand , Geert Uytterhoeven , Magnus Damm , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Len Brown , Saravana Kannan , " =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= " Cc: Abel Vesa , Alexander Stein , Tony Lindgren , Geert Uytterhoeven , John Stultz , Doug Anderson , Guenter Roeck , Dmitry Baryshkov , Maxim Kiselev , Maxim Kochetkov , Luca Weiss , Colin Foster , Martin Kepplinger , Jean-Philippe Brucker , Vladimir Oltean , kernel-team@android.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-acpi@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org This allows fw_devlink to track and enforce supplier-consumer dependencies for scmi_device. Signed-off-by: Saravana Kannan Acked-by: Sudeep Holla Tested-by: Colin Foster Tested-by: Sudeep Holla --- drivers/firmware/arm_scmi/bus.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/firmware/arm_scmi/bus.c b/drivers/firmware/arm_scmi/bus.c index 35bb70724d44..cc2eba067575 100644 --- a/drivers/firmware/arm_scmi/bus.c +++ b/drivers/firmware/arm_scmi/bus.c @@ -12,6 +12,7 @@ #include #include #include +#include #include "common.h" @@ -191,7 +192,7 @@ scmi_device_create(struct device_node *np, struct device *parent, int protocol, scmi_dev->id = id; scmi_dev->protocol_id = protocol; scmi_dev->dev.parent = parent; - scmi_dev->dev.of_node = np; + device_set_node(&scmi_dev->dev, of_fwnode_handle(np)); scmi_dev->dev.bus = &scmi_bus_type; scmi_dev->dev.release = scmi_device_release; dev_set_name(&scmi_dev->dev, "scmi_dev.%d", id); From patchwork Tue Feb 7 01:42:04 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saravana Kannan X-Patchwork-Id: 13130862 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AD8E2C61DA4 for ; Tue, 7 Feb 2023 01:43:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230378AbjBGBnv (ORCPT ); Mon, 6 Feb 2023 20:43:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41920 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230483AbjBGBnE (ORCPT ); Mon, 6 Feb 2023 20:43:04 -0500 Received: from mail-pj1-x104a.google.com (mail-pj1-x104a.google.com [IPv6:2607:f8b0:4864:20::104a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AF31F3645A for ; Mon, 6 Feb 2023 17:42:43 -0800 (PST) Received: by mail-pj1-x104a.google.com with SMTP id a10-20020a17090a740a00b002307faf7db2so3237649pjg.1 for ; Mon, 06 Feb 2023 17:42:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=YX1zBRfC33D3rDRElKAdT20jJS5RQeSlv0JzqWYnjho=; b=UGmq1xHhmv8QgalRGnvex5vaBwzzKCS6zloJhLFOA04JYhf7s2xljRYpy9kTAoNsHa iBC98QSDMciwj7mZAoPpI2usajIcl1gF62f5Z4nG2GjxXwW1tEOTSt3uCwYi8iyDdG37 BQfwQH+F5b5B8hHp73/BToUo9eBPbPtsoJG7VHsq9ww2xJmU91i6mybd4OadC8hcmn4L z/JS/fusQ1z+bJZfl9x8ljB4BFuvxFXBUNKd3sGG9GJYtq6qpJhSHd3ZvicyZg0osOk+ QxgZAlVpjyrodYVEXosDI3FM0qnhjaVmzWT6ld85NejZtUeLAUKpBMz5nIKrGLcp4W86 p/oQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=YX1zBRfC33D3rDRElKAdT20jJS5RQeSlv0JzqWYnjho=; b=zslzc8n09D7A+i9X1H8zQeZj3icj/X/vVbuxrXsObw/8Ov0gvSwIu45IingSIJycpp GcuLrFrdYWYu0czShbnzt65BxIKGs56aHl3aJyMfjvKAlTpZi2Vn817j8KCFFgBeiUkH LL2dXjLDIpl+6HI9DR2lytn2QPpMQIDaCVL9X6BAnAcEi2fNFkvCngXp+G8AYORvt7iM qvwypLo1F7gK2A6pR8NsFD/4O6CmJ/UBWb8bhdpYb/yXEEmc65E0CsxgOCVmgEULWsV8 Awk85Y6rc1Qq/xlnqJyKNo605iji1zPxKFCFgh/k5RlFKSS0RH98+/JNI0NXF/rVJjQJ QsMw== X-Gm-Message-State: AO0yUKXOufxJDiVxIRq+yGLQJSy6sGS2csWqpsFBeQTnlKtAKthHCpeN tl/XiYbvLkQxVXYakpk2lPvYvm+o2W8czeE= X-Google-Smtp-Source: AK7set8Gcli9J3BzSmSCx9wcmgEyp38uzEhI1HIWAsHDVULR2jB9pwdeXZpjU2A6RPq1Ak9f9gnun0I1Kq/a1mU= X-Received: from saravanak.san.corp.google.com ([2620:15c:2d:3:ae1:aba6:f21c:4a94]) (user=saravanak job=sendgmr) by 2002:a17:90a:1d4e:b0:230:ae97:c349 with SMTP id u14-20020a17090a1d4e00b00230ae97c349mr441075pju.8.1675734163194; Mon, 06 Feb 2023 17:42:43 -0800 (PST) Date: Mon, 6 Feb 2023 17:42:04 -0800 In-Reply-To: <20230207014207.1678715-1-saravanak@google.com> Message-Id: <20230207014207.1678715-13-saravanak@google.com> Mime-Version: 1.0 References: <20230207014207.1678715-1-saravanak@google.com> X-Mailer: git-send-email 2.39.1.519.gcb327c4b5f-goog Subject: [PATCH v3 12/12] mtd: mtdpart: Don't create platform device that'll never probe From: Saravana Kannan To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Sudeep Holla , Cristian Marussi , Linus Walleij , Bartosz Golaszewski , Thomas Gleixner , Marc Zyngier , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Frank Rowand , Geert Uytterhoeven , Magnus Damm , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Len Brown , Saravana Kannan , " =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= " Cc: Abel Vesa , Alexander Stein , Tony Lindgren , Geert Uytterhoeven , John Stultz , Doug Anderson , Guenter Roeck , Dmitry Baryshkov , Maxim Kiselev , Maxim Kochetkov , Luca Weiss , Colin Foster , Martin Kepplinger , Jean-Philippe Brucker , Vladimir Oltean , kernel-team@android.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-acpi@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org These "nvmem-cells" platform devices never get probed because there's no platform driver for it and it's never used anywhere else. So it's a waste of memory. These devices also cause fw_devlink to block nvmem consumers of "nvmem-cells" partition from probing because the supplier device never probes. So stop creating platform devices for nvmem-cells partitions to avoid wasting memory and to avoid blocking probing of consumers. Reported-by: Maxim Kiselev Fixes: bcdf0315a61a ("mtd: call of_platform_populate() for MTD partitions") Signed-off-by: Saravana Kannan Tested-by: Maksim Kiselev --- drivers/mtd/mtdpart.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c index d442fa94c872..85f5ee6f06fc 100644 --- a/drivers/mtd/mtdpart.c +++ b/drivers/mtd/mtdpart.c @@ -577,6 +577,7 @@ static int mtd_part_of_parse(struct mtd_info *master, { struct mtd_part_parser *parser; struct device_node *np; + struct device_node *child; struct property *prop; struct device *dev; const char *compat; @@ -594,6 +595,15 @@ static int mtd_part_of_parse(struct mtd_info *master, else np = of_get_child_by_name(np, "partitions"); + /* + * Don't create devices that are added to a bus but will never get + * probed. That'll cause fw_devlink to block probing of consumers of + * this partition until the partition device is probed. + */ + for_each_child_of_node(np, child) + if (of_device_is_compatible(child, "nvmem-cells")) + of_node_set_flag(child, OF_POPULATED); + of_property_for_each_string(np, "compatible", prop, compat) { parser = mtd_part_get_compatible_parser(compat); if (!parser)