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platform/x86/amd: hfi: Add debugfs support

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

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Acked-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/20250609200518.3616080-13-superm1@kernel.org
This commit is contained in:
Mario Limonciello
2025-07-07 22:34:59 +02:00
committed by Borislav Petkov (AMD)
parent 216fe0d768
commit 13bc67a96e
1 changed files with 35 additions and 0 deletions
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drivers/platform/x86/amd/hfi/hfi.c
+35
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@@ -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)