linux-kernel - Re: [PATCH v3 14/14] platform/x86: hfi: Add debugfs support

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Message-ID: <6b67a84b-eeb6-4b53-b3c7-2a0925c6bea0@amd.com>
Date: Wed, 16 Oct 2024 11:09:35 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: Borislav Petkov <bp@...en8.de>, Hans de Goede <hdegoede@...hat.com>,
 x86@...nel.org, "Gautham R . Shenoy" <gautham.shenoy@....com>,
 Perry Yuan <perry.yuan@....com>, LKML <linux-kernel@...r.kernel.org>,
 linux-doc@...r.kernel.org, linux-pm@...r.kernel.org,
 platform-driver-x86@...r.kernel.org,
 Shyam Sundar S K <Shyam-sundar.S-k@....com>
Subject: Re: [PATCH v3 14/14] platform/x86: hfi: Add debugfs support

On 10/16/2024 07:38, Ilpo Järvinen wrote:
> On Tue, 15 Oct 2024, Mario Limonciello wrote:
> 
>> Add a dump of the class and capabilities table to debugfs to assist
>> with debugging scheduler issues.
>>
>> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
>> ---
>> v2->v3:
>>    * New patch
>> ---
>>   drivers/platform/x86/amd/hfi/hfi.c | 31 ++++++++++++++++++++++++++++++
>>   1 file changed, 31 insertions(+)
>>
>> diff --git a/drivers/platform/x86/amd/hfi/hfi.c b/drivers/platform/x86/amd/hfi/hfi.c
>> index 6c90b50f0a40..6df80f6ac73c 100644
>> --- a/drivers/platform/x86/amd/hfi/hfi.c
>> +++ b/drivers/platform/x86/amd/hfi/hfi.c
>> @@ -13,6 +13,7 @@
>>   #include <linux/acpi.h>
>>   #include <linux/cpu.h>
>>   #include <linux/cpumask.h>
>> +#include <linux/debugfs.h>
>>   #include <linux/gfp.h>
>>   #include <linux/init.h>
>>   #include <linux/io.h>
>> @@ -79,6 +80,8 @@ struct amd_hfi_data {
>>   	void __iomem		*pcc_comm_addr;
>>   	struct acpi_subtable_header	*pcct_entry;
>>   	struct amd_shmem_info	*shmem;
>> +
>> +	struct dentry *dbgfs_dir;
>>   };
>>   
>>   /**
>> @@ -243,6 +246,8 @@ static void amd_hfi_remove(struct platform_device *pdev)
>>   {
>>   	struct amd_hfi_data *dev = platform_get_drvdata(pdev);
>>   
>> +	debugfs_remove_recursive(dev->dbgfs_dir);
>> +
>>   	mutex_destroy(&dev->lock);
>>   }
>>   
>> @@ -400,6 +405,28 @@ static int amd_hfi_metadata_parser(struct platform_device *pdev,
>>   	return ret;
>>   }
>>   
>> +static int class_capabilities_show(struct seq_file *s, void *unused)
>> +{
>> +	int cpu, idx;
>> +
>> +	seq_puts(s, "CPU #\tWLC\tPerf\tEff\n");
>> +	for_each_present_cpu(cpu) {
>> +		struct amd_hfi_cpuinfo *hfi_cpuinfo = per_cpu_ptr(&amd_hfi_cpuinfo, cpu);
>> +
>> +		seq_printf(s, "%d\t", cpu);
>> +		for (idx = 0; idx < hfi_cpuinfo->nr_class; idx++) {
>> +			seq_printf(s, "%s%d\t%d\t%d\n",
>> +				   idx == 0 ? "" : "\t",
> 
> Is this conditional printing really required? Why cannot you just print \t
> always here and remove it from the cpu print line?
> 

Thanks for the suggestion, will include in v4.