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Date: Tue, 30 Jan 2024 08:37:53 +0100
From: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
To: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Linux PM <linux-pm@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Ulf Hansson <ulf.hansson@linaro.org>
Subject: Re: [PATCH v2 10/10] PM: sleep: Call dpm_async_fn() directly in each
 suspend phase
Message-ID: <ZbinUdw3Cm58EfkE@linux.intel.com>
References: <5770175.DvuYhMxLoT@kreacher>
 <2203732.Icojqenx9y@kreacher>
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In-Reply-To: <2203732.Icojqenx9y@kreacher>

On Mon, Jan 29, 2024 at 05:29:41PM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> 
> Simplify the system-wide suspend of devices by invoking dpm_async_fn()
> directly from the main loop in each suspend phase instead of using an
> additional wrapper function for running it.
> 
> No intentional functional impact.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>

> ---
> 
> v1 -> v2: No changes.
> 
> ---
>  drivers/base/power/main.c |   61 ++++++++++++++++++----------------------------
>  1 file changed, 25 insertions(+), 36 deletions(-)
> 
> Index: linux-pm/drivers/base/power/main.c
> ===================================================================
> --- linux-pm.orig/drivers/base/power/main.c
> +++ linux-pm/drivers/base/power/main.c
> @@ -1192,7 +1192,7 @@ static void dpm_superior_set_must_resume
>  }
>  
>  /**
> - * __device_suspend_noirq - Execute a "noirq suspend" callback for given device.
> + * device_suspend_noirq - Execute a "noirq suspend" callback for given device.
>   * @dev: Device to handle.
>   * @state: PM transition of the system being carried out.
>   * @async: If true, the device is being suspended asynchronously.
> @@ -1200,7 +1200,7 @@ static void dpm_superior_set_must_resume
>   * The driver of @dev will not receive interrupts while this function is being
>   * executed.
>   */
> -static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool async)
> +static int device_suspend_noirq(struct device *dev, pm_message_t state, bool async)
>  {
>  	pm_callback_t callback = NULL;
>  	const char *info = NULL;
> @@ -1277,18 +1277,10 @@ static void async_suspend_noirq(void *da
>  {
>  	struct device *dev = data;
>  
> -	__device_suspend_noirq(dev, pm_transition, true);
> +	device_suspend_noirq(dev, pm_transition, true);
>  	put_device(dev);
>  }
>  
> -static int device_suspend_noirq(struct device *dev)
> -{
> -	if (dpm_async_fn(dev, async_suspend_noirq))
> -		return 0;
> -
> -	return __device_suspend_noirq(dev, pm_transition, false);
> -}
> -
>  static int dpm_noirq_suspend_devices(pm_message_t state)
>  {
>  	ktime_t starttime = ktime_get();
> @@ -1305,10 +1297,15 @@ static int dpm_noirq_suspend_devices(pm_
>  		struct device *dev = to_device(dpm_late_early_list.prev);
>  
>  		list_move(&dev->power.entry, &dpm_noirq_list);
> +
> +		if (dpm_async_fn(dev, async_suspend_noirq))
> +			continue;
> +
>  		get_device(dev);
> +
>  		mutex_unlock(&dpm_list_mtx);
>  
> -		error = device_suspend_noirq(dev);
> +		error = device_suspend_noirq(dev, state, false);
>  
>  		put_device(dev);
>  
> @@ -1369,14 +1366,14 @@ static void dpm_propagate_wakeup_to_pare
>  }
>  
>  /**
> - * __device_suspend_late - Execute a "late suspend" callback for given device.
> + * device_suspend_late - Execute a "late suspend" callback for given device.
>   * @dev: Device to handle.
>   * @state: PM transition of the system being carried out.
>   * @async: If true, the device is being suspended asynchronously.
>   *
>   * Runtime PM is disabled for @dev while this function is being executed.
>   */
> -static int __device_suspend_late(struct device *dev, pm_message_t state, bool async)
> +static int device_suspend_late(struct device *dev, pm_message_t state, bool async)
>  {
>  	pm_callback_t callback = NULL;
>  	const char *info = NULL;
> @@ -1447,18 +1444,10 @@ static void async_suspend_late(void *dat
>  {
>  	struct device *dev = data;
>  
> -	__device_suspend_late(dev, pm_transition, true);
> +	device_suspend_late(dev, pm_transition, true);
>  	put_device(dev);
>  }
>  
> -static int device_suspend_late(struct device *dev)
> -{
> -	if (dpm_async_fn(dev, async_suspend_late))
> -		return 0;
> -
> -	return __device_suspend_late(dev, pm_transition, false);
> -}
> -
>  /**
>   * dpm_suspend_late - Execute "late suspend" callbacks for all devices.
>   * @state: PM transition of the system being carried out.
> @@ -1481,11 +1470,15 @@ int dpm_suspend_late(pm_message_t state)
>  		struct device *dev = to_device(dpm_suspended_list.prev);
>  
>  		list_move(&dev->power.entry, &dpm_late_early_list);
> +
> +		if (dpm_async_fn(dev, async_suspend_late))
> +			continue;
> +
>  		get_device(dev);
>  
>  		mutex_unlock(&dpm_list_mtx);
>  
> -		error = device_suspend_late(dev);
> +		error = device_suspend_late(dev, state, false);
>  
>  		put_device(dev);
>  
> @@ -1582,12 +1575,12 @@ static void dpm_clear_superiors_direct_c
>  }
>  
>  /**
> - * __device_suspend - Execute "suspend" callbacks for given device.
> + * device_suspend - Execute "suspend" callbacks for given device.
>   * @dev: Device to handle.
>   * @state: PM transition of the system being carried out.
>   * @async: If true, the device is being suspended asynchronously.
>   */
> -static int __device_suspend(struct device *dev, pm_message_t state, bool async)
> +static int device_suspend(struct device *dev, pm_message_t state, bool async)
>  {
>  	pm_callback_t callback = NULL;
>  	const char *info = NULL;
> @@ -1716,18 +1709,10 @@ static void async_suspend(void *data, as
>  {
>  	struct device *dev = data;
>  
> -	__device_suspend(dev, pm_transition, true);
> +	device_suspend(dev, pm_transition, true);
>  	put_device(dev);
>  }
>  
> -static int device_suspend(struct device *dev)
> -{
> -	if (dpm_async_fn(dev, async_suspend))
> -		return 0;
> -
> -	return __device_suspend(dev, pm_transition, false);
> -}
> -
>  /**
>   * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices.
>   * @state: PM transition of the system being carried out.
> @@ -1752,11 +1737,15 @@ int dpm_suspend(pm_message_t state)
>  		struct device *dev = to_device(dpm_prepared_list.prev);
>  
>  		list_move(&dev->power.entry, &dpm_suspended_list);
> +
> +		if (dpm_async_fn(dev, async_suspend))
> +			continue;
> +
>  		get_device(dev);
>  
>  		mutex_unlock(&dpm_list_mtx);
>  
> -		error = device_suspend(dev);
> +		error = device_suspend(dev, state, false);
>  
>  		put_device(dev);
>  
> 
> 
>