1// SPDX-License-Identifier: MIT
  2/*
  3 * Copyright © 2024 Intel Corporation
  4 */
  5#include <linux/sysfs.h>
  6#include <drm/drm_managed.h>
  7
  8#include "xe_gt_types.h"
  9#include "xe_pcode.h"
 10#include "xe_pcode_api.h"
 11#include "xe_tile.h"
 12#include "xe_tile_sysfs.h"
 13#include "xe_vram_freq.h"
 14
 15/**
 16 * DOC: Xe VRAM freq
 17 *
 18 * Provides sysfs entries for vram frequency in tile
 19 *
 20 * device/tile#/memory/freq0/max_freq - This is maximum frequency. This value is read-only as it
 21 *					is the fixed fuse point P0. It is not the system
 22 *					configuration.
 23 * device/tile#/memory/freq0/min_freq - This is minimum frequency. This value is read-only as it
 24 *					is the fixed fuse point PN. It is not the system
 25 *					configuration.
 26 */
 27
 28static struct xe_tile *dev_to_tile(struct device *dev)
 29{
 30	return kobj_to_tile(dev->kobj.parent);
 31}
 32
 33static ssize_t max_freq_show(struct device *dev, struct device_attribute *attr,
 34			     char *buf)
 35{
 36	struct xe_tile *tile = dev_to_tile(dev);
 37	u32 val, mbox;
 38	int err;
 39
 40	mbox = REG_FIELD_PREP(PCODE_MB_COMMAND, PCODE_FREQUENCY_CONFIG)
 41		| REG_FIELD_PREP(PCODE_MB_PARAM1, PCODE_MBOX_FC_SC_READ_FUSED_P0)
 42		| REG_FIELD_PREP(PCODE_MB_PARAM2, PCODE_MBOX_DOMAIN_HBM);
 43
 44	err = xe_pcode_read(tile, mbox, &val, NULL);
 45	if (err)
 46		return err;
 47
 48	/* data_out - Fused P0 for domain ID in units of 50 MHz */
 49	val *= 50;
 50
 51	return sysfs_emit(buf, "%u\n", val);
 52}
 53static DEVICE_ATTR_RO(max_freq);
 54
 55static ssize_t min_freq_show(struct device *dev, struct device_attribute *attr,
 56			     char *buf)
 57{
 58	struct xe_tile *tile = dev_to_tile(dev);
 59	u32 val, mbox;
 60	int err;
 61
 62	mbox = REG_FIELD_PREP(PCODE_MB_COMMAND, PCODE_FREQUENCY_CONFIG)
 63		| REG_FIELD_PREP(PCODE_MB_PARAM1, PCODE_MBOX_FC_SC_READ_FUSED_PN)
 64		| REG_FIELD_PREP(PCODE_MB_PARAM2, PCODE_MBOX_DOMAIN_HBM);
 65
 66	err = xe_pcode_read(tile, mbox, &val, NULL);
 67	if (err)
 68		return err;
 69
 70	/* data_out - Fused Pn for domain ID in units of 50 MHz */
 71	val *= 50;
 72
 73	return sysfs_emit(buf, "%u\n", val);
 74}
 75static DEVICE_ATTR_RO(min_freq);
 76
 77static struct attribute *freq_attrs[] = {
 78	&dev_attr_max_freq.attr,
 79	&dev_attr_min_freq.attr,
 80	NULL
 81};
 82
 83static const struct attribute_group freq_group_attrs = {
 84	.name = "freq0",
 85	.attrs = freq_attrs,
 86};
 87
 88static void vram_freq_sysfs_fini(void *arg)
 89{
 90	struct kobject *kobj = arg;
 91
 92	sysfs_remove_group(kobj, &freq_group_attrs);
 93	kobject_put(kobj);
 94}
 95
 96/**
 97 * xe_vram_freq_sysfs_init - Initialize vram frequency sysfs component
 98 * @tile: Xe Tile object
 99 *
100 * It needs to be initialized after the main tile component is ready
101 *
102 * Returns: 0 on success, negative error code on error.
103 */
104int xe_vram_freq_sysfs_init(struct xe_tile *tile)
105{
106	struct xe_device *xe = tile_to_xe(tile);
107	struct kobject *kobj;
108	int err;
109
110	if (xe->info.platform != XE_PVC)
111		return 0;
112
113	kobj = kobject_create_and_add("memory", tile->sysfs);
114	if (!kobj)
115		return -ENOMEM;
116
117	err = sysfs_create_group(kobj, &freq_group_attrs);
118	if (err) {
119		kobject_put(kobj);
120		return err;
121	}
122
123	return devm_add_action_or_reset(xe->drm.dev, vram_freq_sysfs_fini, kobj);
124}