Commit 13bc67a9 authored by Mario Limonciello's avatar Mario Limonciello Committed by Borislav Petkov (AMD)
Browse files

platform/x86/amd: hfi: Add debugfs support 



Add a dump of the class and capabilities table to debugfs to assist
with debugging scheduler issues.

Signed-off-by: default avatarMario Limonciello <mario.limonciello@amd.com>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: default avatarGautham R. Shenoy <gautham.shenoy@amd.com>
Acked-by: default avatarIlpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/20250609200518.3616080-13-superm1@kernel.org
parent 216fe0d7

drivers/platform/x86/amd/hfi/hfi.c

+35 −0
Original line number Diff line number Diff line
@@ -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>
@@ -73,6 +74,8 @@ struct amd_hfi_data { 
	void __iomem		*pcc_comm_addr;

	struct acpi_subtable_header	*pcct_entry;

	struct amd_shmem_info	*shmem;



	struct dentry *dbgfs_dir;

};



/**
@@ -238,6 +241,13 @@ static int amd_hfi_alloc_class_data(struct platform_device *pdev) 
	return 0;

}



static void amd_hfi_remove(struct platform_device *pdev)

{

	struct amd_hfi_data *dev = platform_get_drvdata(pdev);



	debugfs_remove_recursive(dev->dbgfs_dir);

}



static int amd_set_hfi_ipcc_score(struct amd_hfi_cpuinfo *hfi_cpuinfo, int cpu)

{

	for (int i = 0; i < hfi_cpuinfo->nr_class; i++)
@@ -393,6 +403,26 @@ static int amd_hfi_metadata_parser(struct platform_device *pdev, 
	return ret;

}



static int class_capabilities_show(struct seq_file *s, void *unused)

{

	u32 cpu, idx;



	seq_puts(s, "CPU #\tWLC\tPerf\tEff\n");

	for_each_possible_cpu(cpu) {

		struct amd_hfi_cpuinfo *hfi_cpuinfo = per_cpu_ptr(&amd_hfi_cpuinfo, cpu);



		seq_printf(s, "%d", cpu);

		for (idx = 0; idx < hfi_cpuinfo->nr_class; idx++) {

			seq_printf(s, "\t%u\t%u\t%u\n", idx,

				   hfi_cpuinfo->amd_hfi_classes[idx].perf,

				   hfi_cpuinfo->amd_hfi_classes[idx].eff);

		}

	}



	return 0;

}

DEFINE_SHOW_ATTRIBUTE(class_capabilities);



static int amd_hfi_pm_resume(struct device *dev)

{

	int ret, cpu;
@@ -469,6 +499,10 @@ static int amd_hfi_probe(struct platform_device *pdev) 


	schedule_work(&sched_amd_hfi_itmt_work);



	amd_hfi_data->dbgfs_dir = debugfs_create_dir("amd_hfi", arch_debugfs_dir);

	debugfs_create_file("class_capabilities", 0644, amd_hfi_data->dbgfs_dir, pdev,

			    &class_capabilities_fops);



	return 0;

}
@@ -480,6 +514,7 @@ static struct platform_driver amd_hfi_driver = { 
		.acpi_match_table = ACPI_PTR(amd_hfi_platform_match),

	},

	.probe = amd_hfi_probe,

	.remove = amd_hfi_remove,

};



static int __init amd_hfi_init(void)