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Message-ID: <24090583-2882-4961-a238-c964b099ee55@redhat.com>
Date: Mon, 18 Dec 2023 13:13:05 +0100
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Subject: Re: [PATCH v1] ACPI: utils: Introduce helper for _DEP list lookup
Content-Language: en-US
To: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
 Linux ACPI <linux-acpi@vger.kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
 Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
 Mika Westerberg <mika.westerberg@linux.intel.com>
References: <12358058.O9o76ZdvQC@kreacher>
From: Hans de Goede <hdegoede@redhat.com>
In-Reply-To: <12358058.O9o76ZdvQC@kreacher>
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Hi,

On 12/14/23 12:07, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> 
> The ACPI LPSS driver and the Surface platform driver code use almost the
> same code pattern for checking if one ACPI device is present in the list
> returned by _DEP for another ACPI device.
> 
> To reduce the resulting code duplication, introduce a helper for that
> called acpi_device_dep() and invoke it from both places.
> 
> No intentional functional impact.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> ---
> 
> This depends on the following series sent last week:
> 
> https://lore.kernel.org/linux-acpi/6008018.lOV4Wx5bFT@kreacher/

Thanks, patch looks good to me:

Reviewed-by: Hans de Goede <hdegoede@redhat.com>

feel free to merge this through the linux-pm/ACPI tree.

Regards,

Hans


> 
> ---
>  drivers/acpi/acpi_lpss.c                       |   29 +--------------------
>  drivers/acpi/utils.c                           |   33 +++++++++++++++++++++++++
>  drivers/platform/surface/surface_acpi_notify.c |   28 ---------------------
>  include/acpi/acpi_bus.h                        |    1 
>  4 files changed, 37 insertions(+), 54 deletions(-)
> 
> Index: linux-pm/drivers/acpi/acpi_lpss.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/acpi_lpss.c
> +++ linux-pm/drivers/acpi/acpi_lpss.c
> @@ -563,31 +563,6 @@ static struct device *acpi_lpss_find_dev
>  	return bus_find_device(&pci_bus_type, NULL, &data, match_hid_uid);
>  }
>  
> -static bool acpi_lpss_dep(struct acpi_device *adev, acpi_handle handle)
> -{
> -	struct acpi_handle_list dep_devices;
> -	bool ret = false;
> -	int i;
> -
> -	if (!acpi_has_method(adev->handle, "_DEP"))
> -		return false;
> -
> -	if (!acpi_evaluate_reference(adev->handle, "_DEP", NULL, &dep_devices)) {
> -		dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
> -		return false;
> -	}
> -
> -	for (i = 0; i < dep_devices.count; i++) {
> -		if (dep_devices.handles[i] == handle) {
> -			ret = true;
> -			break;
> -		}
> -	}
> -
> -	acpi_handle_list_free(&dep_devices);
> -	return ret;
> -}
> -
>  static void acpi_lpss_link_consumer(struct device *dev1,
>  				    const struct lpss_device_links *link)
>  {
> @@ -598,7 +573,7 @@ static void acpi_lpss_link_consumer(stru
>  		return;
>  
>  	if ((link->dep_missing_ids && dmi_check_system(link->dep_missing_ids))
> -	    || acpi_lpss_dep(ACPI_COMPANION(dev2), ACPI_HANDLE(dev1)))
> +	    || acpi_device_dep(ACPI_HANDLE(dev2), ACPI_HANDLE(dev1)))
>  		device_link_add(dev2, dev1, link->flags);
>  
>  	put_device(dev2);
> @@ -614,7 +589,7 @@ static void acpi_lpss_link_supplier(stru
>  		return;
>  
>  	if ((link->dep_missing_ids && dmi_check_system(link->dep_missing_ids))
> -	    || acpi_lpss_dep(ACPI_COMPANION(dev1), ACPI_HANDLE(dev2)))
> +	    || acpi_device_dep(ACPI_HANDLE(dev1), ACPI_HANDLE(dev2)))
>  		device_link_add(dev1, dev2, link->flags);
>  
>  	put_device(dev2);
> Index: linux-pm/drivers/acpi/utils.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/utils.c
> +++ linux-pm/drivers/acpi/utils.c
> @@ -450,6 +450,39 @@ void acpi_handle_list_free(struct acpi_h
>  }
>  EXPORT_SYMBOL_GPL(acpi_handle_list_free);
>  
> +/**
> + * acpi_device_dep - Check ACPI device dependency
> + * @target: ACPI handle of the target ACPI device.
> + * @match: ACPI handle to look up in the target's _DEP list.
> + *
> + * Return true if @match is present in the list returned by _DEP for
> + * @target or false otherwise.
> + */
> +bool acpi_device_dep(acpi_handle target, acpi_handle match)
> +{
> +	struct acpi_handle_list dep_devices;
> +	bool ret = false;
> +	int i;
> +
> +	if (!acpi_has_method(target, "_DEP"))
> +		return false;
> +
> +	if (!acpi_evaluate_reference(target, "_DEP", NULL, &dep_devices)) {
> +		acpi_handle_debug(target, "Failed to evaluate _DEP.\n");
> +		return false;
> +	}
> +
> +	for (i = 0; i < dep_devices.count; i++) {
> +		if (dep_devices.handles[i] == match) {
> +			ret = true;
> +			break;
> +		}
> +	}
> +
> +	acpi_handle_list_free(&dep_devices);
> +	return ret;
> +}
> +
>  acpi_status
>  acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld)
>  {
> Index: linux-pm/drivers/platform/surface/surface_acpi_notify.c
> ===================================================================
> --- linux-pm.orig/drivers/platform/surface/surface_acpi_notify.c
> +++ linux-pm/drivers/platform/surface/surface_acpi_notify.c
> @@ -736,32 +736,6 @@ do {										\
>  #define san_consumer_warn(dev, handle, fmt, ...) \
>  	san_consumer_printk(warn, dev, handle, fmt, ##__VA_ARGS__)
>  
> -static bool is_san_consumer(struct platform_device *pdev, acpi_handle handle)
> -{
> -	struct acpi_handle_list dep_devices;
> -	acpi_handle supplier = ACPI_HANDLE(&pdev->dev);
> -	bool ret = false;
> -	int i;
> -
> -	if (!acpi_has_method(handle, "_DEP"))
> -		return false;
> -
> -	if (!acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices)) {
> -		san_consumer_dbg(&pdev->dev, handle, "failed to evaluate _DEP\n");
> -		return false;
> -	}
> -
> -	for (i = 0; i < dep_devices.count; i++) {
> -		if (dep_devices.handles[i] == supplier) {
> -			ret = true;
> -			break;
> -		}
> -	}
> -
> -	acpi_handle_list_free(&dep_devices);
> -	return ret;
> -}
> -
>  static acpi_status san_consumer_setup(acpi_handle handle, u32 lvl,
>  				      void *context, void **rv)
>  {
> @@ -770,7 +744,7 @@ static acpi_status san_consumer_setup(ac
>  	struct acpi_device *adev;
>  	struct device_link *link;
>  
> -	if (!is_san_consumer(pdev, handle))
> +	if (!acpi_device_dep(handle, ACPI_HANDLE(&pdev->dev)))
>  		return AE_OK;
>  
>  	/* Ignore ACPI devices that are not present. */
> Index: linux-pm/include/acpi/acpi_bus.h
> ===================================================================
> --- linux-pm.orig/include/acpi/acpi_bus.h
> +++ linux-pm/include/acpi/acpi_bus.h
> @@ -33,6 +33,7 @@ bool acpi_handle_list_equal(struct acpi_
>  void acpi_handle_list_replace(struct acpi_handle_list *dst,
>  			      struct acpi_handle_list *src);
>  void acpi_handle_list_free(struct acpi_handle_list *list);
> +bool acpi_device_dep(acpi_handle target, acpi_handle match);
>  acpi_status
>  acpi_evaluate_ost(acpi_handle handle, u32 source_event, u32 status_code,
>  		  struct acpi_buffer *status_buf);
> 
> 
>