[PATCH v5 13/13] platform/x86/amd: hfi: Add debugfs support

[Mario Limonciello <mario.limonciello@amd.com>]

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

Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
 drivers/platform/x86/amd/hfi/hfi.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/platform/x86/amd/hfi/hfi.c b/drivers/platform/x86/amd/hfi/hfi.c
index 50407ab805169..839007684b049 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>
@@ -75,6 +76,8 @@ struct amd_hfi_data {
 	void __iomem		*pcc_comm_addr;
 	struct acpi_subtable_header	*pcct_entry;
 	struct amd_shmem_info	*shmem;
+
+	struct dentry *dbgfs_dir;
 };
 
 /**
@@ -239,6 +242,8 @@ 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);
 }
 
@@ -396,6 +401,27 @@ 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", cpu);
+		for (idx = 0; idx < hfi_cpuinfo->nr_class; idx++) {
+			seq_printf(s, "\t%d\t%d\t%d\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 +495,10 @@ 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;
 }
 
-- 
2.43.0