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1// SPDX-License-Identifier: MIT2/*3 * Copyright © 2024 Intel Corporation4 */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 freq17 *18 * Provides sysfs entries for vram frequency in tile19 *20 * device/tile#/memory/freq0/max_freq - This is maximum frequency. This value is read-only as it21 * is the fixed fuse point P0. It is not the system22 * configuration.23 * device/tile#/memory/freq0/min_freq - This is minimum frequency. This value is read-only as it24 * is the fixed fuse point PN. It is not the system25 * 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 NULL81};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 component98 * @tile: Xe Tile object99 *100 * It needs to be initialized after the main tile component is ready101 *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}125