[PATCH 5/8] drm/xe/pf: Allow configuration of VF thresholds over debugfs

[Michal Wajdeczko]

Initial values of all thresholds used by the GuC to monitor VF's
activity is zero (disabled) and we need to explicitly configure
them per each VF. Expose additional attributes over debugfs.

Definitions of all attributes are generated so we will not need
to make any changes if new thresholds would be added to the set.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
---
 drivers/gpu/drm/xe/xe_gt_sriov_pf_debugfs.c | 72 +++++++++++++++++++++
 1 file changed, 72 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_pf_debugfs.c b/drivers/gpu/drm/xe/xe_gt_sriov_pf_debugfs.c
index 5102035faa7e..eb71c2009c34 100644
--- a/drivers/gpu/drm/xe/xe_gt_sriov_pf_debugfs.c
+++ b/drivers/gpu/drm/xe/xe_gt_sriov_pf_debugfs.c
@@ -197,6 +197,71 @@ DEFINE_SRIOV_GT_CONFIG_DEBUGFS_ATTRIBUTE(dbs, u32, "%llu\n");
 DEFINE_SRIOV_GT_CONFIG_DEBUGFS_ATTRIBUTE(exec_quantum, u32, "%llu\n");
 DEFINE_SRIOV_GT_CONFIG_DEBUGFS_ATTRIBUTE(preempt_timeout, u32, "%llu\n");
 
+/*
+ *      /sys/kernel/debug/dri/0/
+ *      ├── gt0
+ *      │   ├── pf
+ *      │   │   ├── threshold_cat_error_count
+ *      │   │   ├── threshold_doorbell_time_us
+ *      │   │   ├── threshold_engine_reset_count
+ *      │   │   ├── threshold_guc_time_us
+ *      │   │   ├── threshold_irq_time_us
+ *      │   │   ├── threshold_page_fault_count
+ *      │   ├── vf1
+ *      │   │   ├── threshold_cat_error_count
+ *      │   │   ├── threshold_doorbell_time_us
+ *      │   │   ├── threshold_engine_reset_count
+ *      │   │   ├── threshold_guc_time_us
+ *      │   │   ├── threshold_irq_time_us
+ *      │   │   ├── threshold_page_fault_count
+ */
+
+static int set_threshold(void *data, u64 val, enum xe_guc_klv_threshold_index index)
+{
+	struct xe_gt *gt = extract_gt(data);
+	unsigned int vfid = extract_vfid(data);
+	struct xe_device *xe = gt_to_xe(gt);
+	int err;
+
+	if (val > (u32)~0ull)
+		return -EOVERFLOW;
+
+	xe_pm_runtime_get(xe);
+	err = xe_gt_sriov_pf_config_set_threshold(gt, vfid, index, val);
+	xe_pm_runtime_put(xe);
+
+	return err;
+}
+
+static int get_threshold(void *data, u64 *val, enum xe_guc_klv_threshold_index index)
+{
+	struct xe_gt *gt = extract_gt(data);
+	unsigned int vfid = extract_vfid(data);
+
+	*val = xe_gt_sriov_pf_config_get_threshold(gt, vfid, index);
+	return 0;
+}
+
+#define DEFINE_SRIOV_GT_THRESHOLD_DEBUGFS_ATTRIBUTE(THRESHOLD, INDEX)		\
+										\
+static int THRESHOLD##_set(void *data, u64 val)					\
+{										\
+	return set_threshold(data, val, INDEX);					\
+}										\
+										\
+static int THRESHOLD##_get(void *data, u64 *val)				\
+{										\
+	return get_threshold(data, val, INDEX);					\
+}										\
+										\
+DEFINE_DEBUGFS_ATTRIBUTE(THRESHOLD##_fops, THRESHOLD##_get, THRESHOLD##_set, "%llu\n")
+
+/* generate all threshold attributes */
+#define define_threshold_attribute(TAG, NAME, ...) \
+	DEFINE_SRIOV_GT_THRESHOLD_DEBUGFS_ATTRIBUTE(NAME, MAKE_XE_GUC_KLV_THRESHOLD_INDEX(TAG));
+MAKE_XE_GUC_KLV_THRESHOLDS_SET(define_threshold_attribute)
+#undef define_threshold_attribute
+
 static void pf_add_config_attrs(struct xe_gt *gt, struct dentry *parent, unsigned int vfid)
 {
 	xe_gt_assert(gt, gt == extract_gt(parent));
@@ -217,6 +282,13 @@ static void pf_add_config_attrs(struct xe_gt *gt, struct dentry *parent, unsigne
 				   &exec_quantum_fops);
 	debugfs_create_file_unsafe("preempt_timeout_us", 0644, parent, parent,
 				   &preempt_timeout_fops);
+
+	/* register all threshold attributes */
+#define register_threshold_attribute(TAG, NAME, ...) \
+	debugfs_create_file_unsafe("threshold_" #NAME, 0644, parent, parent, \
+				   &NAME##_fops);
+	MAKE_XE_GUC_KLV_THRESHOLDS_SET(register_threshold_attribute)
+#undef register_threshold_attribute
 }
 
 /*
-- 
2.43.0