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 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 45 static ssize_t 46 vram_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 70 static DEVICE_ATTR_RW(vram_d3cold_threshold); 71 72 static void xe_device_sysfs_fini(struct drm_device *drm, 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 79 int 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 drmm_add_action_or_reset(&xe->drm, xe_device_sysfs_fini, xe); 89 } 90