From patchwork Mon Sep 12 11:01:13 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jon Hunter X-Patchwork-Id: 9326181 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0855C60231 for ; Mon, 12 Sep 2016 11:07:14 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id ECF88289C3 for ; Mon, 12 Sep 2016 11:07:13 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E1CB228CC6; Mon, 12 Sep 2016 11:07:13 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 1D347289C3 for ; Mon, 12 Sep 2016 11:07:12 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bjP3I-0007EQ-JV; Mon, 12 Sep 2016 11:05:28 +0000 Received: from hqemgate16.nvidia.com ([216.228.121.65]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1bjP0C-0004GS-6v for linux-arm-kernel@lists.infradead.org; Mon, 12 Sep 2016 11:02:19 +0000 Received: from hqnvupgp07.nvidia.com (Not Verified[216.228.121.13]) by hqemgate16.nvidia.com id ; Mon, 12 Sep 2016 04:01:19 -0700 Received: from HQMAIL108.nvidia.com ([172.20.12.94]) by hqnvupgp07.nvidia.com (PGP Universal service); Mon, 12 Sep 2016 03:56:41 -0700 X-PGP-Universal: processed; by hqnvupgp07.nvidia.com on Mon, 12 Sep 2016 03:56:41 -0700 Received: from HQMAIL102.nvidia.com (172.18.146.10) by HQMAIL108.nvidia.com (172.18.146.13) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Mon, 12 Sep 2016 11:01:28 +0000 Received: from HQMAIL103.nvidia.com (172.20.187.11) by HQMAIL102.nvidia.com (172.18.146.10) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Mon, 12 Sep 2016 11:01:28 +0000 Received: from hqnvemgw02.nvidia.com (172.16.227.111) by HQMAIL103.nvidia.com (172.20.187.11) with Microsoft SMTP Server id 15.0.1210.3 via Frontend Transport; Mon, 12 Sep 2016 11:01:28 +0000 Received: from jonathanh-lm.nvidia.com (Not Verified[10.21.132.115]) by hqnvemgw02.nvidia.com with Trustwave SEG (v7, 5, 5, 8150) id ; Mon, 12 Sep 2016 04:01:27 -0700 From: Jon Hunter To: "Rafael J. Wysocki" , Kevin Hilman , Ulf Hansson Subject: [PATCH V2 09/10] PM / Domains: Add support for removing PM domains Date: Mon, 12 Sep 2016 12:01:13 +0100 Message-ID: <1473678074-15126-10-git-send-email-jonathanh@nvidia.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1473678074-15126-1-git-send-email-jonathanh@nvidia.com> References: <1473678074-15126-1-git-send-email-jonathanh@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160912_040216_731113_0E8100F0 X-CRM114-Status: GOOD ( 16.73 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Krzysztof Kozlowski , linux-pm@vger.kernel.org, Alexander Aring , Jon Hunter , Eric Anholt , Thierry Reding , Kukjin Kim , linux-tegra@vger.kernel.org, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP The genpd framework allows users to add PM domains via the pm_genpd_init() function, however, there is no corresponding function to remove a PM domain. For most devices this may be fine as the PM domains are never removed, however, for devices that wish to populate the PM domains from within a driver, having the ability to remove a PM domain if the probing of the device fails or the driver is unloaded is necessary. Add the function pm_genpd_remove() to remove a PM domain by referencing it's generic_pm_domain structure. Note that the bulk of the code that removes the PM domain is placed in a separate local function genpd_remove() (which is called by pm_genpd_remove()). The code is structured in this way to prepare for adding another function to remove a PM domain by provider that will also call genpd_remove(). Note that users of genpd_remove() must call this function with the mutex, gpd_list_lock, held. PM domains can only be removed if the associated provider has been removed, they are not a parent domain to another PM domain and have no devices associated with them. Signed-off-by: Jon Hunter Acked-by: Ulf Hansson --- drivers/base/power/domain.c | 60 +++++++++++++++++++++++++++++++++++++++++++++ include/linux/pm_domain.h | 5 ++++ 2 files changed, 65 insertions(+) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index d5135caa84db..7481e3e316a2 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -1358,6 +1358,66 @@ int pm_genpd_init(struct generic_pm_domain *genpd, } EXPORT_SYMBOL_GPL(pm_genpd_init); +static int genpd_remove(struct generic_pm_domain *genpd) +{ + struct gpd_link *l, *link; + + if (IS_ERR_OR_NULL(genpd)) + return -EINVAL; + + mutex_lock(&genpd->lock); + + if (genpd->has_provider) { + mutex_unlock(&genpd->lock); + pr_err("Provider present, unable to remove %s\n", genpd->name); + return -EBUSY; + } + + if (!list_empty(&genpd->master_links) || genpd->device_count) { + mutex_unlock(&genpd->lock); + pr_err("%s: unable to remove %s\n", __func__, genpd->name); + return -EBUSY; + } + + list_for_each_entry_safe(link, l, &genpd->slave_links, slave_node) { + list_del(&link->master_node); + list_del(&link->slave_node); + kfree(link); + } + + list_del(&genpd->gpd_list_node); + mutex_unlock(&genpd->lock); + cancel_work_sync(&genpd->power_off_work); + pr_debug("%s: removed %s\n", __func__, genpd->name); + + return 0; +} + +/** + * pm_genpd_remove - Remove a generic I/O PM domain + * @genpd: Pointer to PM domain that is to be removed. + * + * To remove the PM domain, this function: + * - Removes the PM domain as a subdomain to any parent domains, + * if it was added. + * - Removes the PM domain from the list of registered PM domains. + * + * The PM domain will only be removed, if the associated provider has + * been removed, it is not a parent to any other PM domain and has no + * devices associated with it. + */ +int pm_genpd_remove(struct generic_pm_domain *genpd) +{ + int ret; + + mutex_lock(&gpd_list_lock); + ret = genpd_remove(genpd); + mutex_unlock(&gpd_list_lock); + + return ret; +} +EXPORT_SYMBOL_GPL(pm_genpd_remove); + #ifdef CONFIG_PM_GENERIC_DOMAINS_OF typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args, diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index 554f8915c691..85f7d53a9827 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -130,6 +130,7 @@ extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, struct generic_pm_domain *target); extern int pm_genpd_init(struct generic_pm_domain *genpd, struct dev_power_governor *gov, bool is_off); +extern int pm_genpd_remove(struct generic_pm_domain *genpd); extern struct dev_power_governor simple_qos_governor; extern struct dev_power_governor pm_domain_always_on_gov; @@ -165,6 +166,10 @@ static inline int pm_genpd_init(struct generic_pm_domain *genpd, { return -ENOSYS; } +static inline int pm_genpd_remove(struct generic_pm_domain *genpd) +{ + return -ENOTSUPP; +} #endif static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,