125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
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// SPDX-License-Identifier: MIT
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/*
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* Copyright © 2024 Intel Corporation
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*/
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#include <linux/sysfs.h>
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#include <drm/drm_managed.h>
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#include "xe_gt_types.h"
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#include "xe_pcode.h"
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#include "xe_pcode_api.h"
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#include "xe_tile.h"
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#include "xe_tile_sysfs.h"
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#include "xe_vram_freq.h"
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/**
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* DOC: Xe VRAM freq
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*
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* Provides sysfs entries for vram frequency in tile
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*
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* device/tile#/memory/freq0/max_freq - This is maximum frequency. This value is read-only as it
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* is the fixed fuse point P0. It is not the system
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* configuration.
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* device/tile#/memory/freq0/min_freq - This is minimum frequency. This value is read-only as it
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* is the fixed fuse point PN. It is not the system
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* configuration.
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*/
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static struct xe_tile *dev_to_tile(struct device *dev)
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{
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return kobj_to_tile(dev->kobj.parent);
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}
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static ssize_t max_freq_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct xe_tile *tile = dev_to_tile(dev);
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u32 val, mbox;
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int err;
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mbox = REG_FIELD_PREP(PCODE_MB_COMMAND, PCODE_FREQUENCY_CONFIG)
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| REG_FIELD_PREP(PCODE_MB_PARAM1, PCODE_MBOX_FC_SC_READ_FUSED_P0)
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| REG_FIELD_PREP(PCODE_MB_PARAM2, PCODE_MBOX_DOMAIN_HBM);
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err = xe_pcode_read(tile, mbox, &val, NULL);
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if (err)
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return err;
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/* data_out - Fused P0 for domain ID in units of 50 MHz */
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val *= 50;
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return sysfs_emit(buf, "%u\n", val);
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}
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static DEVICE_ATTR_RO(max_freq);
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static ssize_t min_freq_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct xe_tile *tile = dev_to_tile(dev);
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u32 val, mbox;
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int err;
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mbox = REG_FIELD_PREP(PCODE_MB_COMMAND, PCODE_FREQUENCY_CONFIG)
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| REG_FIELD_PREP(PCODE_MB_PARAM1, PCODE_MBOX_FC_SC_READ_FUSED_PN)
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| REG_FIELD_PREP(PCODE_MB_PARAM2, PCODE_MBOX_DOMAIN_HBM);
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err = xe_pcode_read(tile, mbox, &val, NULL);
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if (err)
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return err;
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/* data_out - Fused Pn for domain ID in units of 50 MHz */
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val *= 50;
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return sysfs_emit(buf, "%u\n", val);
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}
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static DEVICE_ATTR_RO(min_freq);
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static struct attribute *freq_attrs[] = {
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&dev_attr_max_freq.attr,
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&dev_attr_min_freq.attr,
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NULL
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};
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static const struct attribute_group freq_group_attrs = {
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.name = "freq0",
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.attrs = freq_attrs,
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};
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static void vram_freq_sysfs_fini(void *arg)
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{
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struct kobject *kobj = arg;
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sysfs_remove_group(kobj, &freq_group_attrs);
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kobject_put(kobj);
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}
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/**
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* xe_vram_freq_sysfs_init - Initialize vram frequency sysfs component
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* @tile: Xe Tile object
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*
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* It needs to be initialized after the main tile component is ready
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*
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* Returns: 0 on success, negative error code on error.
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*/
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int xe_vram_freq_sysfs_init(struct xe_tile *tile)
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{
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struct xe_device *xe = tile_to_xe(tile);
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struct kobject *kobj;
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int err;
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if (xe->info.platform != XE_PVC)
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return 0;
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kobj = kobject_create_and_add("memory", tile->sysfs);
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if (!kobj)
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return -ENOMEM;
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err = sysfs_create_group(kobj, &freq_group_attrs);
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if (err) {
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kobject_put(kobj);
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return err;
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}
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return devm_add_action_or_reset(xe->drm.dev, vram_freq_sysfs_fini, kobj);
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}
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