xe_observation.c

  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 <uapi/drm/xe_drm.h>
 10
 11#include "xe_eu_stall.h"
 12#include "xe_oa.h"
 13#include "xe_observation.h"
 14
 15u32 xe_observation_paranoid = true;
 16static struct ctl_table_header *sysctl_header;
 17
 18static int xe_oa_ioctl(struct drm_device *dev, struct drm_xe_observation_param *arg,
 19		       struct drm_file *file)
 20{
 21	switch (arg->observation_op) {
 22	case DRM_XE_OBSERVATION_OP_STREAM_OPEN:
 23		return xe_oa_stream_open_ioctl(dev, arg->param, file);
 24	case DRM_XE_OBSERVATION_OP_ADD_CONFIG:
 25		return xe_oa_add_config_ioctl(dev, arg->param, file);
 26	case DRM_XE_OBSERVATION_OP_REMOVE_CONFIG:
 27		return xe_oa_remove_config_ioctl(dev, arg->param, file);
 28	default:
 29		return -EINVAL;
 30	}
 31}
 32
 33static int xe_eu_stall_ioctl(struct drm_device *dev, struct drm_xe_observation_param *arg,
 34			     struct drm_file *file)
 35{
 36	switch (arg->observation_op) {
 37	case DRM_XE_OBSERVATION_OP_STREAM_OPEN:
 38		return xe_eu_stall_stream_open(dev, arg->param, file);
 39	default:
 40		return -EINVAL;
 41	}
 42}
 43
 44/**
 45 * xe_observation_ioctl - The top level observation layer ioctl
 46 * @dev: @drm_device
 47 * @data: pointer to struct @drm_xe_observation_param
 48 * @file: @drm_file
 49 *
 50 * The function is called for different observation streams types and
 51 * allows execution of different operations supported by those stream
 52 * types.
 53 *
 54 * Return: 0 on success or a negative error code on failure.
 55 */
 56int xe_observation_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
 57{
 58	struct drm_xe_observation_param *arg = data;
 59
 60	if (arg->extensions)
 61		return -EINVAL;
 62
 63	switch (arg->observation_type) {
 64	case DRM_XE_OBSERVATION_TYPE_OA:
 65		return xe_oa_ioctl(dev, arg, file);
 66	case DRM_XE_OBSERVATION_TYPE_EU_STALL:
 67		return xe_eu_stall_ioctl(dev, arg, file);
 68	default:
 69		return -EINVAL;
 70	}
 71}
 72
 73static const struct ctl_table observation_ctl_table[] = {
 74	{
 75	 .procname = "observation_paranoid",
 76	 .data = &xe_observation_paranoid,
 77	 .maxlen = sizeof(xe_observation_paranoid),
 78	 .mode = 0644,
 79	 .proc_handler = proc_dointvec_minmax,
 80	 .extra1 = SYSCTL_ZERO,
 81	 .extra2 = SYSCTL_ONE,
 82	 },
 83};
 84
 85/**
 86 * xe_observation_sysctl_register - Register xe_observation_paranoid sysctl
 87 *
 88 * Normally only superuser/root can access observation stream
 89 * data. However, superuser can set xe_observation_paranoid sysctl to 0 to
 90 * allow non-privileged users to also access observation data.
 91 *
 92 * Return: always returns 0
 93 */
 94int xe_observation_sysctl_register(void)
 95{
 96	sysctl_header = register_sysctl("dev/xe", observation_ctl_table);
 97	return 0;
 98}
 99
100/**
101 * xe_observation_sysctl_unregister - Unregister xe_observation_paranoid sysctl
102 */
103void xe_observation_sysctl_unregister(void)
104{
105	unregister_sysctl_table(sysctl_header);
106}