[Intel-xe] [PATCH] [RFC]drm/xe: Sysfs entries to query fused min, max frequency of lmem

[Sujaritha Sundaresan]

Signed-off-by: Sujaritha Sundaresan <sujaritha.sundaresan at intel.com>
---
 drivers/gpu/drm/xe/regs/xe_regs.h |  7 +++++
 drivers/gpu/drm/xe/xe_guc_pc.c    | 44 +++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)

diff --git a/drivers/gpu/drm/xe/regs/xe_regs.h b/drivers/gpu/drm/xe/regs/xe_regs.h
index 8be616a1bd51..bd7b26296402 100644
--- a/drivers/gpu/drm/xe/regs/xe_regs.h
+++ b/drivers/gpu/drm/xe/regs/xe_regs.h
@@ -101,4 +101,11 @@
 #define DSMBASE					XE_REG(0x1080C0)
 #define   BDSM_MASK				REG_GENMASK64(63, 20)
 
+#define   XEHP_PCODE_FREQUENCY_CONFIG           0x6e
+/* XEHP_PCODE_FREQUENCY_CONFIG sub-commands (param1) */
+#define     PCODE_MBOX_FC_SC_READ_FUSED_P0      0x0
+#define     PCODE_MBOX_FC_SC_READ_FUSED_PN      0x1
+/* PCODE_MBOX_DOMAIN_* - mailbox domain IDs */
+#define     PCODE_MBOX_DOMAIN_HBM               0x2
+
 #endif
diff --git a/drivers/gpu/drm/xe/xe_guc_pc.c b/drivers/gpu/drm/xe/xe_guc_pc.c
index 67faa9ee0006..1b349ce74c3d 100644
--- a/drivers/gpu/drm/xe/xe_guc_pc.c
+++ b/drivers/gpu/drm/xe/xe_guc_pc.c
@@ -453,6 +453,48 @@ static ssize_t freq_rpn_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(freq_rpn);
 
+static ssize_t freq_mem_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(dev, XEHPSDV_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_mem_rp0);
+
+static ssize_t freq_mem_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(dev, XEHPSDV_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_mem_rpn);
+
 static ssize_t freq_min_show(struct device *dev,
 			     struct device_attribute *attr, char *buf)
 {
@@ -631,6 +673,8 @@ static const struct attribute *pc_attrs[] = {
 	&dev_attr_freq_rp0.attr,
 	&dev_attr_freq_rpe.attr,
 	&dev_attr_freq_rpn.attr,
+	&dev_attr_freq_mem_rp0.attr,
+	&dev_attr_freq_mem_rpn.attr,
 	&dev_attr_freq_min.attr,
 	&dev_attr_freq_max.attr,
 	&dev_attr_rc_status.attr,
-- 
2.39.1