[Intel-xe] [RFC 4/4] drm/xe: Add vram frequency sysfs attributes

[Sujaritha Sundaresan]

Add vram rp0/n frequency sysfs attribuites under
/device/../tile<n>/memory/freq/vram_rp0/n_freq

Signed-off-by: Sujaritha Sundaresan <sujaritha.sundaresan at intel.com>
---
 drivers/gpu/drm/xe/xe_pcode_api.h  |  8 ++++
 drivers/gpu/drm/xe/xe_tile_sysfs.c | 77 ++++++++++++++++++++++++++++--
 2 files changed, 81 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_pcode_api.h b/drivers/gpu/drm/xe/xe_pcode_api.h
index 5935cfe30204..c003a423562c 100644
--- a/drivers/gpu/drm/xe/xe_pcode_api.h
+++ b/drivers/gpu/drm/xe/xe_pcode_api.h
@@ -42,6 +42,14 @@
 #define	    POWER_SETUP_I1_SHIFT		6	/* 10.6 fixed point format */
 #define	    POWER_SETUP_I1_DATA_MASK		REG_GENMASK(15, 0)
 
+#define   XEHP_PCODE_FREQUENCY_CONFIG			0x6e	/* xehp, pvc */
+/* 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 */
+/* XEHP_PCODE_FREQUENCY_CONFIG param2 */
+#define     PCODE_MBOX_DOMAIN_HBM			0x2
+
 struct pcode_err_decode {
 	int errno;
 	const char *str;
diff --git a/drivers/gpu/drm/xe/xe_tile_sysfs.c b/drivers/gpu/drm/xe/xe_tile_sysfs.c
index d61c6fb1df40..2a6a515f48e8 100644
--- a/drivers/gpu/drm/xe/xe_tile_sysfs.c
+++ b/drivers/gpu/drm/xe/xe_tile_sysfs.c
@@ -7,9 +7,15 @@
 #include <linux/sysfs.h>
 #include <drm/drm_managed.h>
 
+#include "xe_gt.h"
+#include "xe_gt_sysfs.h"
+#include "xe_pcode.h"
+#include "xe_pcode_api.h"
 #include "xe_tile.h"
 #include "xe_tile_sysfs.h"
 
+#define GT_FREQUENCY_MULTIPLIER	50
+
 static void xe_tile_sysfs_kobj_release(struct kobject *kobj)
 {
 	kfree(kobj);
@@ -34,6 +40,58 @@ static DEVICE_ATTR_RO(physical_vram_size_bytes);
 static const struct attribute *physical_memsize_attr =
 	&dev_attr_physical_vram_size_bytes.attr;
 
+static ssize_t vram_rp0_freq_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, mbox;
+	int err;
+
+	mbox = REG_FIELD_PREP(PCODE_MB_COMMAND, XEHP_PCODE_FREQUENCY_CONFIG)
+		| REG_FIELD_PREP(PCODE_MB_PARAM1, PCODE_MBOX_FC_SC_READ_FUSED_P0)
+		| REG_FIELD_PREP(PCODE_MB_PARAM2, PCODE_MBOX_DOMAIN_HBM);
+
+	err = xe_pcode_read(gt, mbox, &val, NULL);
+	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(vram_rp0_freq);
+
+static ssize_t vram_rpn_freq_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, mbox;
+	int err;
+
+	mbox = REG_FIELD_PREP(PCODE_MB_COMMAND, XEHP_PCODE_FREQUENCY_CONFIG)
+		| REG_FIELD_PREP(PCODE_MB_PARAM1, PCODE_MBOX_FC_SC_READ_FUSED_PN)
+		| REG_FIELD_PREP(PCODE_MB_PARAM2, PCODE_MBOX_DOMAIN_HBM);
+
+	err = xe_pcode_read(gt, mbox, &val, NULL);
+	if (err)
+		return err;
+
+	/* data_out - Fused Pn for domain ID in units of 50 MHz */
+	val *= GT_FREQUENCY_MULTIPLIER;
+
+	return sysfs_emit(buff, "%u\n", val);
+}
+static DEVICE_ATTR_RO(vram_rpn_freq);
+
+static const struct attribute *vram_freq_attrs[] = {
+	&dev_attr_vram_rp0_freq.attr,
+	&dev_attr_vram_rpn_freq.attr,
+	NULL
+};
+
 static void tile_sysfs_fini(struct drm_device *drm, void *arg)
 {
 	struct xe_tile *tile = arg;
@@ -46,7 +104,8 @@ void xe_tile_sysfs_init(struct xe_tile *tile)
 	struct xe_device *xe = tile_to_xe(tile);
 	struct device *dev = xe->drm.dev;
 	struct kobj_tile *kt;
-	struct kobject *kobj;
+	struct kobject *kobj1, *kobj2;
+
 	int err;
 
 	kt = kzalloc(sizeof(*kt), GFP_KERNEL);
@@ -65,17 +124,27 @@ void xe_tile_sysfs_init(struct xe_tile *tile)
 
 	tile->sysfs = &kt->base;
 
-	kobj = kobject_create_and_add("memory", tile->sysfs);
-	if (!kobj) {
+	kobj1 = kobject_create_and_add("memory", tile->sysfs);
+	if (!kobj1) {
 		drm_warn(&xe->drm, "%s failed, err: %d\n", __func__, -ENOMEM);
 		return;
 	}
 
 	if (IS_DGFX(xe) && xe->info.platform != XE_DG1 &&
-	    sysfs_create_file(kobj, physical_memsize_attr))
+	    sysfs_create_file(kobj1, physical_memsize_attr))
 		drm_warn(&xe->drm,
 			 "Sysfs creation to read addr_range per tile failed\n");
 
+	kobj2 = kobject_create_and_add("freq", kobj1);
+	if (xe->info.platform == XE_PVC) {
+	err = sysfs_create_files(kobj2, vram_freq_attrs);
+		if (err) {
+			kobject_put(&kt->base);
+			drm_warn(&xe->drm, "failed to register vram freq sysfs, err: %d\n", err);
+			return;
+		}
+	}
+
 	err = drmm_add_action_or_reset(&xe->drm, tile_sysfs_fini, tile);
 	if (err) {
 		drm_warn(&xe->drm, "%s: drmm_add_action_or_reset failed, err: %d\n",
-- 
2.25.1