1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2023-2024 Intel Corporation 4 */ 5 6 #include <linux/errno.h> 7 #include <linux/sysctl.h> 8 9 #include <drm/xe_drm.h> 10 11 #include "xe_oa.h" 12 #include "xe_observation.h" 13 14 u32 xe_observation_paranoid = true; 15 static struct ctl_table_header *sysctl_header; 16 17 static int xe_oa_ioctl(struct drm_device *dev, struct drm_xe_observation_param *arg, 18 struct drm_file *file) 19 { 20 switch (arg->observation_op) { 21 case DRM_XE_OBSERVATION_OP_STREAM_OPEN: 22 return xe_oa_stream_open_ioctl(dev, arg->param, file); 23 case DRM_XE_OBSERVATION_OP_ADD_CONFIG: 24 return xe_oa_add_config_ioctl(dev, arg->param, file); 25 case DRM_XE_OBSERVATION_OP_REMOVE_CONFIG: 26 return xe_oa_remove_config_ioctl(dev, arg->param, file); 27 default: 28 return -EINVAL; 29 } 30 } 31 32 /** 33 * xe_observation_ioctl - The top level observation layer ioctl 34 * @dev: @drm_device 35 * @data: pointer to struct @drm_xe_observation_param 36 * @file: @drm_file 37 * 38 * The function is called for different observation streams types and 39 * allows execution of different operations supported by those stream 40 * types. 41 * 42 * Return: 0 on success or a negative error code on failure. 43 */ 44 int xe_observation_ioctl(struct drm_device *dev, void *data, struct drm_file *file) 45 { 46 struct drm_xe_observation_param *arg = data; 47 48 if (arg->extensions) 49 return -EINVAL; 50 51 switch (arg->observation_type) { 52 case DRM_XE_OBSERVATION_TYPE_OA: 53 return xe_oa_ioctl(dev, arg, file); 54 default: 55 return -EINVAL; 56 } 57 } 58 59 static struct ctl_table observation_ctl_table[] = { 60 { 61 .procname = "observation_paranoid", 62 .data = &xe_observation_paranoid, 63 .maxlen = sizeof(xe_observation_paranoid), 64 .mode = 0644, 65 .proc_handler = proc_dointvec_minmax, 66 .extra1 = SYSCTL_ZERO, 67 .extra2 = SYSCTL_ONE, 68 }, 69 {} 70 }; 71 72 /** 73 * xe_observation_sysctl_register - Register xe_observation_paranoid sysctl 74 * 75 * Normally only superuser/root can access observation stream 76 * data. However, superuser can set xe_observation_paranoid sysctl to 0 to 77 * allow non-privileged users to also access observation data. 78 * 79 * Return: always returns 0 80 */ 81 int xe_observation_sysctl_register(void) 82 { 83 sysctl_header = register_sysctl("dev/xe", observation_ctl_table); 84 return 0; 85 } 86 87 /** 88 * xe_observation_sysctl_unregister - Unregister xe_observation_paranoid sysctl 89 */ 90 void xe_observation_sysctl_unregister(void) 91 { 92 unregister_sysctl_table(sysctl_header); 93 } 94