From patchwork Wed Nov 15 18:18:35 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sakari Ailus X-Patchwork-Id: 744007 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="frqu3lkc" Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.20]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3F58E1A3; Wed, 15 Nov 2023 10:18:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1700072334; x=1731608334; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=/V+4a6YBThcc56i41tofczUJdxwhFYsIxlS5sBR3VII=; b=frqu3lkcWZ2MFDbp/hKQ0TANfH5WsBbqJgk+qZWxRde1RJ/jhSr/JZoa 4g5cjUztuo28zuZ24XjJ3eoMebCcFVAsOVuOb/wt+xJkXOxmAatrpFq4R HfoH3S3PAqbXsOs1z18vfwGh/GkjimiTURU/Xcbisqfi8Cu9NTZ5oau9a JV2MLy7dTugqIBFkXHW7mRg6ndfi9Oi3MS/1AbbnTzBAE/mBvXvxK3/HA veseXbrnGQCvZs7QPV+uWTN33arBf8jQtPCdbzoqo55PqDltStjHg9cQL SSD84XJgGBxAgtAk0hDflHr0LCyzZC1G96uo+fsS/V62d1sP02f+tBD8r g==; X-IronPort-AV: E=McAfee;i="6600,9927,10895"; a="381321123" X-IronPort-AV: E=Sophos;i="6.03,305,1694761200"; d="scan'208";a="381321123" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Nov 2023 10:18:46 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10895"; a="831014655" X-IronPort-AV: E=Sophos;i="6.03,305,1694761200"; d="scan'208";a="831014655" Received: from turnipsi.fi.intel.com (HELO kekkonen.fi.intel.com) ([10.237.72.44]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Nov 2023 10:18:44 -0800 Received: from svinhufvud.ger.corp.intel.com (localhost [IPv6:::1]) by kekkonen.fi.intel.com (Postfix) with ESMTP id 68ACD11FBD1; Wed, 15 Nov 2023 20:18:41 +0200 (EET) From: Sakari Ailus To: linux-acpi@vger.kernel.org Cc: linux-media@vger.kernel.org, rafael@kernel.org, jacopo.mondi@ideasonboard.com, laurent.pinchart@ideasonboard.com Subject: [PATCH 1/6] pm: runtime: Simplify pm_runtime_get_if_active() usage Date: Wed, 15 Nov 2023 20:18:35 +0200 Message-Id: <20231115181840.1509046-2-sakari.ailus@linux.intel.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231115181840.1509046-1-sakari.ailus@linux.intel.com> References: <20231115181840.1509046-1-sakari.ailus@linux.intel.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The majority of the callers currently using pm_runtime_get_if_active() call it with ign_usage_count argument set to true. There's only one driver using this feature (and natually implementation of pm_runtime_get_if_in_use()). To make this function more practical to use, remove the ign_usage_count argument from the function. The main implementation is renamed as __pm_runtime_get_conditional(). This function is expected to gain a large number of users in the future --- camera sensor drivers using runtime autosuspend have a need to get the device's usage_count conditionally if it is enabled. Most of these currently use pm_runtime_get_if_in_use(), which is a bug. Signed-off-by: Sakari Ailus --- Documentation/power/runtime_pm.rst | 5 ++-- drivers/base/power/runtime.c | 9 ++++--- drivers/gpu/drm/i915/intel_runtime_pm.c | 2 +- drivers/media/i2c/ccs/ccs-core.c | 2 +- drivers/net/ipa/ipa_smp2p.c | 2 +- drivers/pci/pci.c | 2 +- include/linux/pm_runtime.h | 31 +++++++++++++++++++++---- sound/hda/hdac_device.c | 2 +- 8 files changed, 39 insertions(+), 16 deletions(-) diff --git a/Documentation/power/runtime_pm.rst b/Documentation/power/runtime_pm.rst index 65b86e487afe..da99379071a4 100644 --- a/Documentation/power/runtime_pm.rst +++ b/Documentation/power/runtime_pm.rst @@ -396,10 +396,9 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h: nonzero, increment the counter and return 1; otherwise return 0 without changing the counter - `int pm_runtime_get_if_active(struct device *dev, bool ign_usage_count);` + `int pm_runtime_get_if_active(struct device *dev);` - return -EINVAL if 'power.disable_depth' is nonzero; otherwise, if the - runtime PM status is RPM_ACTIVE, and either ign_usage_count is true - or the device's usage_count is non-zero, increment the counter and + runtime PM status is RPM_ACTIVE, increment the counter and return 1; otherwise return 0 without changing the counter `void pm_runtime_put_noidle(struct device *dev);` diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index 4545669cb973..8b56468eca9d 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -1175,7 +1175,7 @@ int __pm_runtime_resume(struct device *dev, int rpmflags) EXPORT_SYMBOL_GPL(__pm_runtime_resume); /** - * pm_runtime_get_if_active - Conditionally bump up device usage counter. + * __pm_runtime_get_conditional - Conditionally bump up device usage counter. * @dev: Device to handle. * @ign_usage_count: Whether or not to look at the current usage counter value. * @@ -1195,8 +1195,11 @@ EXPORT_SYMBOL_GPL(__pm_runtime_resume); * * The caller is responsible for decrementing the runtime PM usage counter of * @dev after this function has returned a positive value for it. + * + * This function is not intended to be called by drivers, use + * pm_runtime_get_if_active() or pm_runtime_get_if_in_use() instead. */ -int pm_runtime_get_if_active(struct device *dev, bool ign_usage_count) +int __pm_runtime_get_conditional(struct device *dev, bool ign_usage_count) { unsigned long flags; int retval; @@ -1217,7 +1220,7 @@ int pm_runtime_get_if_active(struct device *dev, bool ign_usage_count) return retval; } -EXPORT_SYMBOL_GPL(pm_runtime_get_if_active); +EXPORT_SYMBOL_GPL(__pm_runtime_get_conditional); /** * __pm_runtime_set_status - Set runtime PM status of a device. diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c index 6d8e5e5c0cba..b163efe80975 100644 --- a/drivers/gpu/drm/i915/intel_runtime_pm.c +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c @@ -434,7 +434,7 @@ static intel_wakeref_t __intel_runtime_pm_get_if_active(struct intel_runtime_pm * function, since the power state is undefined. This applies * atm to the late/early system suspend/resume handlers. */ - if (pm_runtime_get_if_active(rpm->kdev, ignore_usecount) <= 0) + if (__pm_runtime_get_conditional(rpm->kdev, ignore_usecount) <= 0) return 0; } diff --git a/drivers/media/i2c/ccs/ccs-core.c b/drivers/media/i2c/ccs/ccs-core.c index 12e6f0a26fc8..45701a18c845 100644 --- a/drivers/media/i2c/ccs/ccs-core.c +++ b/drivers/media/i2c/ccs/ccs-core.c @@ -664,7 +664,7 @@ static int ccs_set_ctrl(struct v4l2_ctrl *ctrl) break; } - pm_status = pm_runtime_get_if_active(&client->dev, true); + pm_status = pm_runtime_get_if_active(&client->dev); if (!pm_status) return 0; diff --git a/drivers/net/ipa/ipa_smp2p.c b/drivers/net/ipa/ipa_smp2p.c index 5620dc271fac..cbf3d4761ce3 100644 --- a/drivers/net/ipa/ipa_smp2p.c +++ b/drivers/net/ipa/ipa_smp2p.c @@ -92,7 +92,7 @@ static void ipa_smp2p_notify(struct ipa_smp2p *smp2p) return; dev = &smp2p->ipa->pdev->dev; - smp2p->power_on = pm_runtime_get_if_active(dev, true) > 0; + smp2p->power_on = pm_runtime_get_if_active(dev) > 0; /* Signal whether the IPA power is enabled */ mask = BIT(smp2p->enabled_bit); diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 59c01d68c6d5..d8d4abbc936f 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -2439,7 +2439,7 @@ static void pci_pme_list_scan(struct work_struct *work) * If the device is in a low power state it * should not be polled either. */ - pm_status = pm_runtime_get_if_active(dev, true); + pm_status = pm_runtime_get_if_active(dev); if (!pm_status) continue; diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h index 7c9b35448563..810330bb802b 100644 --- a/include/linux/pm_runtime.h +++ b/include/linux/pm_runtime.h @@ -72,7 +72,8 @@ extern int pm_runtime_force_resume(struct device *dev); extern int __pm_runtime_idle(struct device *dev, int rpmflags); extern int __pm_runtime_suspend(struct device *dev, int rpmflags); extern int __pm_runtime_resume(struct device *dev, int rpmflags); -extern int pm_runtime_get_if_active(struct device *dev, bool ign_usage_count); +extern int __pm_runtime_get_conditional(struct device *dev, + bool ign_usage_count); extern int pm_schedule_suspend(struct device *dev, unsigned int delay); extern int __pm_runtime_set_status(struct device *dev, unsigned int status); extern int pm_runtime_barrier(struct device *dev); @@ -94,16 +95,33 @@ extern void pm_runtime_release_supplier(struct device_link *link); extern int devm_pm_runtime_enable(struct device *dev); +/** + * pm_runtime_get_if_active - Bump up runtime PM usage counter if the device is + * in active state + * @dev: Target device. + * + * Increment the runtime PM usage counter of @dev if its runtime PM status is + * %RPM_ACTIVE, in which case it returns 1. If the device is in a different + * state, 0 is returned. -EINVAL is returned if runtime PM is disabled for the + * device. + */ +static inline int pm_runtime_get_if_active(struct device *dev) +{ + return __pm_runtime_get_conditional(dev, true); +} + /** * pm_runtime_get_if_in_use - Conditionally bump up runtime PM usage counter. * @dev: Target device. * * Increment the runtime PM usage counter of @dev if its runtime PM status is - * %RPM_ACTIVE and its runtime PM usage counter is greater than 0. + * %RPM_ACTIVE and its runtime PM usage counter is greater than 0, in which case + * it returns 1. If the device is in a different state or its usage_count is 0, + * 0 is returned. -EINVAL is returned if runtime PM is disabled for the device. */ static inline int pm_runtime_get_if_in_use(struct device *dev) { - return pm_runtime_get_if_active(dev, false); + return __pm_runtime_get_conditional(dev, false); } /** @@ -275,8 +293,11 @@ static inline int pm_runtime_get_if_in_use(struct device *dev) { return -EINVAL; } -static inline int pm_runtime_get_if_active(struct device *dev, - bool ign_usage_count) +static inline int pm_runtime_get_if_active(struct device *dev) +{ + return -EINVAL; +} +static inline int __pm_runtime_get_conditional(struct device *dev) { return -EINVAL; } diff --git a/sound/hda/hdac_device.c b/sound/hda/hdac_device.c index bbf7bcdb449a..0a9223c18d77 100644 --- a/sound/hda/hdac_device.c +++ b/sound/hda/hdac_device.c @@ -611,7 +611,7 @@ EXPORT_SYMBOL_GPL(snd_hdac_power_up_pm); int snd_hdac_keep_power_up(struct hdac_device *codec) { if (!atomic_inc_not_zero(&codec->in_pm)) { - int ret = pm_runtime_get_if_active(&codec->dev, true); + int ret = pm_runtime_get_if_active(&codec->dev); if (!ret) return -1; if (ret < 0)