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1// SPDX-License-Identifier: MIT2/*3 * Copyright © 2023 Intel Corporation4 */5 6#include <linux/kobject.h>7#include <linux/pci.h>8#include <linux/sysfs.h>9 10#include <drm/drm_managed.h>11 12#include "xe_device.h"13#include "xe_device_sysfs.h"14#include "xe_pm.h"15 16/**17 * DOC: Xe device sysfs18 * Xe driver requires exposing certain tunable knobs controlled by user space for19 * each graphics device. Considering this, we need to add sysfs attributes at device20 * level granularity.21 * These sysfs attributes will be available under pci device kobj directory.22 *23 * vram_d3cold_threshold - Report/change vram used threshold(in MB) below24 * which vram save/restore is permissible during runtime D3cold entry/exit.25 */26 27static ssize_t28vram_d3cold_threshold_show(struct device *dev,29 struct device_attribute *attr, char *buf)30{31 struct pci_dev *pdev = to_pci_dev(dev);32 struct xe_device *xe = pdev_to_xe_device(pdev);33 int ret;34 35 if (!xe)36 return -EINVAL;37 38 xe_pm_runtime_get(xe);39 ret = sysfs_emit(buf, "%d\n", xe->d3cold.vram_threshold);40 xe_pm_runtime_put(xe);41 42 return ret;43}44 45static ssize_t46vram_d3cold_threshold_store(struct device *dev, struct device_attribute *attr,47 const char *buff, size_t count)48{49 struct pci_dev *pdev = to_pci_dev(dev);50 struct xe_device *xe = pdev_to_xe_device(pdev);51 u32 vram_d3cold_threshold;52 int ret;53 54 if (!xe)55 return -EINVAL;56 57 ret = kstrtou32(buff, 0, &vram_d3cold_threshold);58 if (ret)59 return ret;60 61 drm_dbg(&xe->drm, "vram_d3cold_threshold: %u\n", vram_d3cold_threshold);62 63 xe_pm_runtime_get(xe);64 ret = xe_pm_set_vram_threshold(xe, vram_d3cold_threshold);65 xe_pm_runtime_put(xe);66 67 return ret ?: count;68}69 70static DEVICE_ATTR_RW(vram_d3cold_threshold);71 72static void xe_device_sysfs_fini(void *arg)73{74 struct xe_device *xe = arg;75 76 sysfs_remove_file(&xe->drm.dev->kobj, &dev_attr_vram_d3cold_threshold.attr);77}78 79int xe_device_sysfs_init(struct xe_device *xe)80{81 struct device *dev = xe->drm.dev;82 int ret;83 84 ret = sysfs_create_file(&dev->kobj, &dev_attr_vram_d3cold_threshold.attr);85 if (ret)86 return ret;87 88 return devm_add_action_or_reset(dev, xe_device_sysfs_fini, xe);89}90