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	struct xe_gt *gt = tile->primary_gt;
 38	u32 val, mbox;
 39	int err;
 40
 41	mbox = REG_FIELD_PREP(PCODE_MB_COMMAND, PCODE_FREQUENCY_CONFIG)
 42		| REG_FIELD_PREP(PCODE_MB_PARAM1, PCODE_MBOX_FC_SC_READ_FUSED_P0)
 43		| REG_FIELD_PREP(PCODE_MB_PARAM2, PCODE_MBOX_DOMAIN_HBM);
 44
 45	err = xe_pcode_read(gt, mbox, &val, NULL);
 46	if (err)
 47		return err;
 48
 49	/* data_out - Fused P0 for domain ID in units of 50 MHz */
 50	val *= 50;
 51
 52	return sysfs_emit(buf, "%u\n", val);
 53}
 54static DEVICE_ATTR_RO(max_freq);
 55
 56static ssize_t min_freq_show(struct device *dev, struct device_attribute *attr,
 57			     char *buf)
 58{
 59	struct xe_tile *tile = dev_to_tile(dev);
 60	struct xe_gt *gt = tile->primary_gt;
 61	u32 val, mbox;
 62	int err;
 63
 64	mbox = REG_FIELD_PREP(PCODE_MB_COMMAND, PCODE_FREQUENCY_CONFIG)
 65		| REG_FIELD_PREP(PCODE_MB_PARAM1, PCODE_MBOX_FC_SC_READ_FUSED_PN)
 66		| REG_FIELD_PREP(PCODE_MB_PARAM2, PCODE_MBOX_DOMAIN_HBM);
 67
 68	err = xe_pcode_read(gt, mbox, &val, NULL);
 69	if (err)
 70		return err;
 71
 72	/* data_out - Fused Pn for domain ID in units of 50 MHz */
 73	val *= 50;
 74
 75	return sysfs_emit(buf, "%u\n", val);
 76}
 77static DEVICE_ATTR_RO(min_freq);
 78
 79static struct attribute *freq_attrs[] = {
 80	&dev_attr_max_freq.attr,
 81	&dev_attr_min_freq.attr,
 82	NULL
 83};
 84
 85static const struct attribute_group freq_group_attrs = {
 86	.name = "freq0",
 87	.attrs = freq_attrs,
 88};
 89
 90static void vram_freq_sysfs_fini(struct drm_device *drm, void *arg)
 91{
 92	struct kobject *kobj = arg;
 93
 94	sysfs_remove_group(kobj, &freq_group_attrs);
 95	kobject_put(kobj);
 96}
 97
 98/**
 99 * xe_vram_freq_sysfs_init - Initialize vram frequency sysfs component
100 * @tile: Xe Tile object
101 *
102 * It needs to be initialized after the main tile component is ready
103 */
104void 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;
112
113	kobj = kobject_create_and_add("memory", tile->sysfs);
114	if (!kobj) {
115		drm_warn(&xe->drm, "failed to add memory directory, err: %d\n", -ENOMEM);
116		return;
117	}
118
119	err = sysfs_create_group(kobj, &freq_group_attrs);
120	if (err) {
121		kobject_put(kobj);
122		drm_warn(&xe->drm, "failed to register vram freq sysfs, err: %d\n", err);
123		return;
124	}
125
126	err = drmm_add_action_or_reset(&xe->drm, vram_freq_sysfs_fini, kobj);
127	if (err)
128		drm_warn(&xe->drm, "%s: drmm_add_action_or_reset failed, err: %d\n",
129			 __func__, err);
130}