linux-kernel - Re: [PATCH v6 09/12] platform/x86: alienware-wmi-wmax: Add a DebugFS interface

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Message-Id: <D8S7STGMNHO8.FOJPC4C803BI@gmail.com>
Date: Fri, 28 Mar 2025 18:25:02 -0300
From: "Kurt Borja" <kuurtb@...il.com>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: "Armin Wolf" <W_Armin@....de>, "Hans de Goede" <hdegoede@...hat.com>,
 <platform-driver-x86@...r.kernel.org>, <Dell.Client.Kernel@...l.com>,
 "LKML" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 09/12] platform/x86: alienware-wmi-wmax: Add a
 DebugFS interface

On Fri Mar 28, 2025 at 1:18 PM -03, Ilpo Järvinen wrote:
> On Thu, 13 Mar 2025, Kurt Borja wrote:
>
>> Add a debugfs interface which exposes thermal private data.
>> 
>> Reviewed-by: Armin Wolf <W_Armin@....de>
>> Signed-off-by: Kurt Borja <kuurtb@...il.com>
>> ---
>>  drivers/platform/x86/dell/alienware-wmi-wmax.c | 90 ++++++++++++++++++++++++++
>>  1 file changed, 90 insertions(+)
>> 
>> diff --git a/drivers/platform/x86/dell/alienware-wmi-wmax.c b/drivers/platform/x86/dell/alienware-wmi-wmax.c
>> index 823b579260555085ef6ac793b806738a756bb9da..472e6289fec5be0db0a5cb8e76718b750fa558b5 100644
>> --- a/drivers/platform/x86/dell/alienware-wmi-wmax.c
>> +++ b/drivers/platform/x86/dell/alienware-wmi-wmax.c
>> @@ -11,6 +11,7 @@
>>  #include <linux/bitfield.h>
>>  #include <linux/bitmap.h>
>>  #include <linux/bits.h>
>> +#include <linux/debugfs.h>
>>  #include <linux/dmi.h>
>>  #include <linux/hwmon.h>
>>  #include <linux/hwmon-sysfs.h>
>> @@ -19,6 +20,7 @@
>>  #include <linux/moduleparam.h>
>>  #include <linux/platform_profile.h>
>>  #include <linux/pm.h>
>> +#include <linux/seq_file.h>
>>  #include <linux/units.h>
>>  #include <linux/wmi.h>
>>  #include "alienware-wmi.h"
>> @@ -1252,6 +1254,92 @@ static int awcc_platform_profile_init(struct wmi_device *wdev)
>>  	return PTR_ERR_OR_ZERO(priv->ppdev);
>>  }
>>  
>> +/*
>> + * DebugFS
>> + */
>> +static int awcc_debugfs_system_description_read(struct seq_file *seq, void *data)
>> +{
>> +	struct device *dev = seq->private;
>> +	struct awcc_priv *priv = dev_get_drvdata(dev);
>> +
>> +	seq_printf(seq, "0x%08x\n", priv->system_description);
>> +
>> +	return 0;
>> +}
>> +
>> +static int awcc_debugfs_hwmon_data_read(struct seq_file *seq, void *data)
>> +{
>> +	struct device *dev = seq->private;
>> +	struct awcc_priv *priv = dev_get_drvdata(dev);
>> +	const struct awcc_fan_data *fan;
>> +	unsigned int bit;
>> +
>> +	seq_printf(seq, "Number of fans: %u\n", priv->fan_count);
>> +	seq_printf(seq, "Number of temperature sensors: %u\n\n", priv->temp_count);
>> +
>> +	for (u32 i = 0; i < priv->fan_count; i++) {
>> +		fan = priv->fan_data[i];
>> +
>> +		seq_printf(seq, "Fan %u:\n", i);
>> +		seq_printf(seq, "  ID: 0x%02x\n", fan->id);
>> +		seq_printf(seq, "  Related temperature sensors bitmap: %lu\n",
>> +			   fan->auto_channels_temp);
>> +	}
>> +
>> +	seq_puts(seq, "\nTemperature sensor IDs:\n");
>> +	for_each_set_bit(bit, priv->temp_sensors, AWCC_ID_BITMAP_SIZE)
>> +		seq_printf(seq, "  0x%02x\n", bit);
>> +
>> +	return 0;
>> +}
>> +
>> +static int awcc_debugfs_pprof_data_read(struct seq_file *seq, void *data)
>> +{
>> +	struct device *dev = seq->private;
>> +	struct awcc_priv *priv = dev_get_drvdata(dev);
>> +
>> +	seq_printf(seq, "Number of thermal profiles: %u\n\n", priv->profile_count);
>> +
>> +	for (u32 i = 0; i < PLATFORM_PROFILE_LAST; i++) {
>> +		if (!priv->supported_profiles[i])
>> +			continue;
>> +
>> +		seq_printf(seq, "Platform profile %u:\n", i);
>> +		seq_printf(seq, "  ID: 0x%02x\n", priv->supported_profiles[i]);
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static void awcc_debugfs_remove(void *data)
>> +{
>> +	struct dentry *root = data;
>> +
>> +	debugfs_remove(root);
>> +}
>> +
>> +static void awcc_debugfs_init(struct wmi_device *wdev)
>> +{
>> +	struct dentry *root;
>> +	char name[64];
>> +
>> +	scnprintf(name, ARRAY_SIZE(name), "%s-%s", "alienware-wmi", dev_name(&wdev->dev));
>
> You'd need to add include for ARRAY_SIZE() but can't you just use 
> sizeof()?

Sure, it's 1 byte anyway. Though I think I use ARRAY_SIZE somewhere
else so I'll add the include too.

Thank you so much for your feedback! I'll send v7 this weekend.

-- 
 ~ Kurt

>
>> +	root = debugfs_create_dir(name, NULL);
>> +
>> +	debugfs_create_devm_seqfile(&wdev->dev, "system_description", root,
>> +				    awcc_debugfs_system_description_read);
>> +
>> +	if (awcc->hwmon)
>> +		debugfs_create_devm_seqfile(&wdev->dev, "hwmon_data", root,
>> +					    awcc_debugfs_hwmon_data_read);
>> +
>> +	if (awcc->pprof)
>> +		debugfs_create_devm_seqfile(&wdev->dev, "pprof_data", root,
>> +					    awcc_debugfs_pprof_data_read);
>> +
>> +	devm_add_action_or_reset(&wdev->dev, awcc_debugfs_remove, root);
>> +}
>> +
>>  static int alienware_awcc_setup(struct wmi_device *wdev)
>>  {
>>  	struct awcc_priv *priv;
>> @@ -1290,6 +1378,8 @@ static int alienware_awcc_setup(struct wmi_device *wdev)
>>  			return ret;
>>  	}
>>  
>> +	awcc_debugfs_init(wdev);
>> +
>>  	return 0;
>>  }
>>  
>> 
>>