[Intel-xe] [PATCH 3/3, v2] drm/xe: Sysfs entries to query vram fused min, max frequency

[Sujaritha Sundaresan]

Add sysfs enteries for vram rp0 and vram rpn frequencies

v2: Fix review comments (Anshuman)

Signed-off-by: Sujaritha Sundaresan <sujaritha.sundaresan at intel.com>
---
 drivers/gpu/drm/xe/xe_guc_pc.c | 54 ++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_guc_pc.c b/drivers/gpu/drm/xe/xe_guc_pc.c
index 6a139d1dbf66..5084da83896b 100644
--- a/drivers/gpu/drm/xe/xe_guc_pc.c
+++ b/drivers/gpu/drm/xe/xe_guc_pc.c
@@ -752,6 +752,54 @@ static const struct attribute *pvc_perf_power_attrs[] = {
 	NULL
 };
 
+static ssize_t freq_vram_rp0_show(struct device *dev, struct device_attribute *attr,
+				  char *buff)
+{
+	struct kobject *kobj = &dev->kobj;
+	struct xe_gt *gt = kobj_to_gt(kobj);
+	u32 val;
+	int err;
+
+	err = xe_pcode_read_p(gt, XEHP_PCODE_FREQUENCY_CONFIG,
+			      PCODE_MBOX_FC_SC_READ_FUSED_P0,
+			      PCODE_MBOX_DOMAIN_HBM, &val);
+	if (err)
+		return err;
+
+	/* data_out - Fused P0 for domain ID in units of 50 MHz */
+	val *= GT_FREQUENCY_MULTIPLIER;
+
+	return sysfs_emit(buff, "%u\n", val);
+}
+static DEVICE_ATTR_RO(freq_vram_rp0);
+
+static ssize_t freq_vram_rpn_show(struct device *dev, struct device_attribute *attr,
+				  char *buff)
+{
+	struct kobject *kobj = &dev->kobj;
+	struct xe_gt *gt = kobj_to_gt(kobj);
+	u32 val;
+	int err;
+
+	err = xe_pcode_read_p(gt, XEHP_PCODE_FREQUENCY_CONFIG,
+			      PCODE_MBOX_FC_SC_READ_FUSED_PN,
+			      PCODE_MBOX_DOMAIN_HBM, &val);
+	if (err)
+		return err;
+
+	/* data_out - Fused P0 for domain ID in units of 50 MHz */
+	val *= GT_FREQUENCY_MULTIPLIER;
+
+	return sysfs_emit(buff, "%u\n", val);
+}
+static DEVICE_ATTR_RO(freq_vram_rpn);
+
+static const struct attribute *vram_freq_attrs[] = {
+	&dev_attr_freq_vram_rp0.attr,
+	&dev_attr_freq_vram_rpn.attr,
+	NULL
+};
+
 static void mtl_init_fused_rp_values(struct xe_guc_pc *pc)
 {
 	struct xe_gt *gt = pc_to_gt(pc);
@@ -1041,6 +1089,12 @@ int xe_guc_pc_init(struct xe_guc_pc *pc)
 			return err;
 	}
 
+	if (xe->info.platform == XE_PVC) {
+		err = sysfs_create_files(tile->sysfs, vram_freq_attrs);
+		if (err)
+			return err;
+	}
+
 	err = drmm_add_action_or_reset(&xe->drm, pc_fini, pc);
 	if (err)
 		return err;
-- 
2.25.1