drm/xe/pf: Introduce functions to configure VF thresholds

The GuC firmware monitors VF's activity and notifies the PF driver
once any configured threshold related to such activity is exceeded.
Add functions to allow configuration of these thresholds per VF.

Reviewed-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240514190015.2172-5-michal.wajdeczko@intel.com

1 files changed, 87 insertions, 0 deletions

diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c b/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c
index 7eac01e04cc5..f678cd1ad9c5 100644
--- a/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c
+++ b/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c
@@ -25,6 +25,7 @@
 #include "xe_guc_fwif.h"
 #include "xe_guc_id_mgr.h"
 #include "xe_guc_klv_helpers.h"
+#include "xe_guc_klv_thresholds_set.h"
 #include "xe_guc_submit.h"
 #include "xe_lmtt.h"
 #include "xe_map.h"
@@ -208,6 +209,15 @@ static int pf_push_vf_cfg_lmem(struct xe_gt *gt, unsigned int vfid, u64 size)
 	return pf_push_vf_cfg_u64(gt, vfid, GUC_KLV_VF_CFG_LMEM_SIZE_KEY, size);
 }
 
+static int pf_push_vf_cfg_threshold(struct xe_gt *gt, unsigned int vfid,
+				    enum xe_guc_klv_threshold_index index, u32 value)
+{
+	u32 key = xe_guc_klv_threshold_index_to_key(index);
+
+	xe_gt_assert(gt, key);
+	return pf_push_vf_cfg_u32(gt, vfid, key, value);
+}
+
 static struct xe_gt_sriov_config *pf_pick_vf_config(struct xe_gt *gt, unsigned int vfid)
 {
 	xe_gt_assert(gt, IS_SRIOV_PF(gt_to_xe(gt)));
@@ -1748,6 +1758,83 @@ static void pf_reset_config_sched(struct xe_gt *gt, struct xe_gt_sriov_config *c
 	config->preempt_timeout = 0;
 }
 
+static int pf_provision_threshold(struct xe_gt *gt, unsigned int vfid,
+				  enum xe_guc_klv_threshold_index index, u32 value)
+{
+	struct xe_gt_sriov_config *config = pf_pick_vf_config(gt, vfid);
+	int err;
+
+	err = pf_push_vf_cfg_threshold(gt, vfid, index, value);
+	if (unlikely(err))
+		return err;
+
+	config->thresholds[index] = value;
+
+	return 0;
+}
+
+static int pf_get_threshold(struct xe_gt *gt, unsigned int vfid,
+			    enum xe_guc_klv_threshold_index index)
+{
+	struct xe_gt_sriov_config *config = pf_pick_vf_config(gt, vfid);
+
+	return config->thresholds[index];
+}
+
+static const char *threshold_unit(u32 threshold)
+{
+	return threshold ? "" : "(disabled)";
+}
+
+/**
+ * xe_gt_sriov_pf_config_set_threshold - Configure threshold for the VF.
+ * @gt: the &xe_gt
+ * @vfid: the VF identifier
+ * @index: the threshold index
+ * @value: requested value (0 means disabled)
+ *
+ * This function can only be called on PF.
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int xe_gt_sriov_pf_config_set_threshold(struct xe_gt *gt, unsigned int vfid,
+					enum xe_guc_klv_threshold_index index, u32 value)
+{
+	u32 key = xe_guc_klv_threshold_index_to_key(index);
+	const char *name = xe_guc_klv_key_to_string(key);
+	int err;
+
+	mutex_lock(xe_gt_sriov_pf_master_mutex(gt));
+	err = pf_provision_threshold(gt, vfid, index, value);
+	mutex_unlock(xe_gt_sriov_pf_master_mutex(gt));
+
+	return pf_config_set_u32_done(gt, vfid, value,
+				      xe_gt_sriov_pf_config_get_threshold(gt, vfid, index),
+				      name, threshold_unit, err);
+}
+
+/**
+ * xe_gt_sriov_pf_config_get_threshold - Get VF's threshold.
+ * @gt: the &xe_gt
+ * @vfid: the VF identifier
+ * @index: the threshold index
+ *
+ * This function can only be called on PF.
+ *
+ * Return: value of VF's (or PF's) threshold.
+ */
+u32 xe_gt_sriov_pf_config_get_threshold(struct xe_gt *gt, unsigned int vfid,
+					enum xe_guc_klv_threshold_index index)
+{
+	u32 value;
+
+	mutex_lock(xe_gt_sriov_pf_master_mutex(gt));
+	value = pf_get_threshold(gt, vfid, index);
+	mutex_unlock(xe_gt_sriov_pf_master_mutex(gt));
+
+	return value;
+}
+
 static void pf_release_vf_config(struct xe_gt *gt, unsigned int vfid)
 {
 	struct xe_gt_sriov_config *config = pf_pick_vf_config(gt, vfid);