1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2023 Intel Corporation 4 */ 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 sysfs 18 * Xe driver requires exposing certain tunable knobs controlled by user space for 19 * each graphics device. Considering this, we need to add sysfs attributes at device 20 * 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) below 24 * which vram save/restore is permissible during runtime D3cold entry/exit. 25 */ 26 27 static ssize_t 28 vram_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 ret = sysfs_emit(buf, "%d\n", xe->d3cold.vram_threshold); 39 40 return ret; 41 } 42 43 static ssize_t 44 vram_d3cold_threshold_store(struct device *dev, struct device_attribute *attr, 45 const char *buff, size_t count) 46 { 47 struct pci_dev *pdev = to_pci_dev(dev); 48 struct xe_device *xe = pdev_to_xe_device(pdev); 49 u32 vram_d3cold_threshold; 50 int ret; 51 52 if (!xe) 53 return -EINVAL; 54 55 ret = kstrtou32(buff, 0, &vram_d3cold_threshold); 56 if (ret) 57 return ret; 58 59 drm_dbg(&xe->drm, "vram_d3cold_threshold: %u\n", vram_d3cold_threshold); 60 61 ret = xe_pm_set_vram_threshold(xe, vram_d3cold_threshold); 62 63 return ret ?: count; 64 } 65 66 static DEVICE_ATTR_RW(vram_d3cold_threshold); 67 68 static void xe_device_sysfs_fini(struct drm_device *drm, void *arg) 69 { 70 struct xe_device *xe = arg; 71 72 sysfs_remove_file(&xe->drm.dev->kobj, &dev_attr_vram_d3cold_threshold.attr); 73 } 74 75 void xe_device_sysfs_init(struct xe_device *xe) 76 { 77 struct device *dev = xe->drm.dev; 78 int ret; 79 80 ret = sysfs_create_file(&dev->kobj, &dev_attr_vram_d3cold_threshold.attr); 81 if (ret) { 82 drm_warn(&xe->drm, "Failed to create sysfs file\n"); 83 return; 84 } 85 86 ret = drmm_add_action_or_reset(&xe->drm, xe_device_sysfs_fini, xe); 87 if (ret) 88 drm_warn(&xe->drm, "Failed to add sysfs fini drm action\n"); 89 } 90