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Thu, 05 Feb 2026 16:30:13 -0800 (PST) From: "Kevin Hilman (TI)" Date: Thu, 05 Feb 2026 16:29:56 -0800 Subject: [PATCH v2 2/3] pmdomain: core: add genpd_for_each_child() helper Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260205-topic-lpm-pmdomain-device-constraints-v2-2-61f7be7d35ac@baylibre.com> References: <20260205-topic-lpm-pmdomain-device-constraints-v2-0-61f7be7d35ac@baylibre.com> In-Reply-To: <20260205-topic-lpm-pmdomain-device-constraints-v2-0-61f7be7d35ac@baylibre.com> To: "Rafael J. Wysocki" , Ulf Hansson , linux-pm@vger.kernel.org Cc: Dhruva Gole , linux-kernel@vger.kernel.org X-Mailer: b4 0.15-dev-47773 X-Developer-Signature: v=1; a=openpgp-sha256; l=3526; i=khilman@baylibre.com; h=from:subject:message-id; bh=Kgntq9uZyzEnQnUEouKXldKwCVaQgcJWIll2FInth/k=; b=owEBbQKS/ZANAwAIAVk3GJrT+8ZlAcsmYgBphTYSOuD3/5V9Lr0GRm9Cn6aAYwd9DdjrAAtwZ MznTvfikK2JAjMEAAEIAB0WIQR7h0YOFpJ/qfW/8QxZNxia0/vGZQUCaYU2EgAKCRBZNxia0/vG ZcowD/4uh5xOW2Otf1K6v8+eritq27XJUooDMcRBQAIXcKqi4hlBszDuUvqyTDj3xntlFvCfAu3 0W8fYX34Owc38zxhlllXWWqYLncZzzi9PeG3qlynuIdkqeN+0A7EQkBFSUntu0o0Kw8QGWBqfrS 8Bi4S+R6iwyCb2o6NM8BhRAoc8gbQpxNY8yJzWnOYRW8PIjU9y69eRuT0lSQmzlwNejzyxu45+b S12yCw6wcqc7967Y0WiwiCBGdXvKE5V7icOcU30+e9JldYAKHGGl25tFYGYcRjgVs8R+7EIqE3r N7yVJHQ5x9eppu64TpxgVRWUCU+AxgcFhPsB0YZZGAmi7D520aeNX2/8ObLPoQHenMf+N8qqXqz CNnPgdKDk356jBdz7bjE8u3pjxETNQtMM6bWpj1DF1orRIhQs4LsA/zRfga4cNJcHNlm6x9c/JL 1fu3z/QkTEXCHrvBmlrxdvJFhLMOwmLsr5AgJhjGn4tPMkAPLloFaeok1XmmtVtfcPGaHD4ludc PzasCMmWMLH1eYTYCQ7FuJAgPzGbG4OVU3QntUDsRizXpWsCC1Smj4R4j/UR9UT0ugf++sQfySx xk/GNgox3UgONLYeoxKidzoUfxmaNlmNuGkwdJRqMu7dQPrWpltiMaQzI6injWobX2vZORtmRJ9 eKIbuqfKIiP7REQ== X-Developer-Key: i=khilman@baylibre.com; a=openpgp; fpr=7B87460E16927FA9F5BFF10C5937189AD3FBC665 Add a new internal helper function genpd_for_each_child() that recursively iterates over all devices in a PM domain and its child domains (subdomains). This helper is useful for governors and other core PM domain code that needs to examine or apply operations to all devices within a domain hierarchy. The function takes a callback that is invoked for each device, and supports early termination if the callback returns a non-zero value. The helper is defined in a new internal header drivers/pmdomain/core.h and implemented in drivers/pmdomain/core.c, making it available to other PM domain subsystem components. The first user of this helper is the cpu_system_power_down_ok() governor function, which uses it to check device QoS latency constraints across the entire domain hierarchy. Signed-off-by: Kevin Hilman (TI) --- drivers/pmdomain/core.c | 42 ++++++++++++++++++++++++++++++++++++++++++ drivers/pmdomain/core.h | 17 +++++++++++++++++ 2 files changed, 59 insertions(+) diff --git a/drivers/pmdomain/core.c b/drivers/pmdomain/core.c index bf82775f6a67..41c987fc5c5a 100644 --- a/drivers/pmdomain/core.c +++ b/drivers/pmdomain/core.c @@ -24,6 +24,8 @@ #include #include =20 +#include "core.h" + /* Provides a unique ID for each genpd device */ static DEFINE_IDA(genpd_ida); =20 @@ -281,6 +283,46 @@ static void genpd_sd_counter_inc(struct generic_pm_dom= ain *genpd) smp_mb__after_atomic(); } =20 +/** + * genpd_for_each_child - Recursively iterate over all devices + * in a PM domain and its subdomains. + * @genpd: PM domain to iterate over. + * @fn: Callback function to invoke for each device. + * @data: Data to pass to the callback function. + * + * This function recursively walks through all devices in the given PM dom= ain + * and all devices in its child PM domains (subdomains). For each device f= ound, + * the callback function @fn is invoked with the device and @data as argum= ents. + * + * Returns: 0 on success, or the first non-zero value returned by @fn. + */ +int genpd_for_each_child(struct generic_pm_domain *genpd, + int (*fn)(struct device *dev, void *data), + void *data) +{ + struct pm_domain_data *pdd; + struct gpd_link *link; + int ret; + + /* First, iterate over all devices in this domain */ + list_for_each_entry(pdd, &genpd->dev_list, list_node) { + ret =3D fn(pdd->dev, data); + if (ret) + return ret; + } + + /* Then, recursively iterate over all child domains (subdomains) */ + list_for_each_entry(link, &genpd->parent_links, parent_node) { + struct generic_pm_domain *child_pd =3D link->child; + + ret =3D genpd_for_each_child(child_pd, fn, data); + if (ret) + return ret; + } + + return 0; +} + #ifdef CONFIG_DEBUG_FS static struct dentry *genpd_debugfs_dir; =20 diff --git a/drivers/pmdomain/core.h b/drivers/pmdomain/core.h new file mode 100644 index 000000000000..7061891d31fb --- /dev/null +++ b/drivers/pmdomain/core.h @@ -0,0 +1,17 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Internal header for PM domain core + * + * Copyright (C) 2011 Rafael J. Wysocki , Renesas Electronics= Corp. + */ + +#ifndef __PM_DOMAIN_CORE_H__ +#define __PM_DOMAIN_CORE_H__ + +#include + +int genpd_for_each_child(struct generic_pm_domain *genpd, + int (*fn)(struct device *dev, void *data), + void *data); + +#endif /* __PM_DOMAIN_CORE_H__ */ --=20 2.51.0