1// SPDX-License-Identifier: MIT
  2/*
  3 * Copyright © 2019 Intel Corporation
  4 */
  5
  6#include <linux/debugfs.h>
  7
  8#include "i915_drv.h"
  9#include "intel_gt.h"
 10#include "intel_gt_debugfs.h"
 11#include "intel_gt_engines_debugfs.h"
 12#include "intel_gt_mcr.h"
 13#include "intel_gt_pm_debugfs.h"
 14#include "intel_sseu_debugfs.h"
 15#include "uc/intel_uc_debugfs.h"
 16
 17int intel_gt_debugfs_reset_show(struct intel_gt *gt, u64 *val)
 18{
 19	int ret = intel_gt_terminally_wedged(gt);
 20
 21	switch (ret) {
 22	case -EIO:
 23		*val = 1;
 24		return 0;
 25	case 0:
 26		*val = 0;
 27		return 0;
 28	default:
 29		return ret;
 30	}
 31}
 32
 33void intel_gt_debugfs_reset_store(struct intel_gt *gt, u64 val)
 34{
 35	/* Flush any previous reset before applying for a new one */
 36	wait_event(gt->reset.queue,
 37		   !test_bit(I915_RESET_BACKOFF, &gt->reset.flags));
 38
 39	intel_gt_handle_error(gt, val, I915_ERROR_CAPTURE,
 40			      "Manually reset engine mask to %llx", val);
 41}
 42
 43/*
 44 * keep the interface clean where the first parameter
 45 * is a 'struct intel_gt *' instead of 'void *'
 46 */
 47static int __intel_gt_debugfs_reset_show(void *data, u64 *val)
 48{
 49	return intel_gt_debugfs_reset_show(data, val);
 50}
 51
 52static int __intel_gt_debugfs_reset_store(void *data, u64 val)
 53{
 54	intel_gt_debugfs_reset_store(data, val);
 55
 56	return 0;
 57}
 58
 59DEFINE_SIMPLE_ATTRIBUTE(reset_fops, __intel_gt_debugfs_reset_show,
 60			__intel_gt_debugfs_reset_store, "%llu\n");
 61
 62static int steering_show(struct seq_file *m, void *data)
 63{
 64	struct drm_printer p = drm_seq_file_printer(m);
 65	struct intel_gt *gt = m->private;
 66
 67	intel_gt_mcr_report_steering(&p, gt, true);
 68
 69	return 0;
 70}
 71DEFINE_INTEL_GT_DEBUGFS_ATTRIBUTE(steering);
 72
 73static void gt_debugfs_register(struct intel_gt *gt, struct dentry *root)
 74{
 75	static const struct intel_gt_debugfs_file files[] = {
 76		{ "reset", &reset_fops, NULL },
 77		{ "steering", &steering_fops },
 78	};
 79
 80	intel_gt_debugfs_register_files(root, files, ARRAY_SIZE(files), gt);
 81}
 82
 83void intel_gt_debugfs_register(struct intel_gt *gt)
 84{
 85	struct dentry *root;
 86	char gtname[4];
 87
 88	if (!gt->i915->drm.primary->debugfs_root)
 89		return;
 90
 91	snprintf(gtname, sizeof(gtname), "gt%u", gt->info.id);
 92	root = debugfs_create_dir(gtname, gt->i915->drm.primary->debugfs_root);
 93	if (IS_ERR(root))
 94		return;
 95
 96	gt_debugfs_register(gt, root);
 97
 98	intel_gt_engines_debugfs_register(gt, root);
 99	intel_gt_pm_debugfs_register(gt, root);
100	intel_sseu_debugfs_register(gt, root);
101
102	intel_uc_debugfs_register(&gt->uc, root);
103}
104
105void intel_gt_debugfs_register_files(struct dentry *root,
106				     const struct intel_gt_debugfs_file *files,
107				     unsigned long count, void *data)
108{
109	while (count--) {
110		umode_t mode = files->fops->write ? 0644 : 0444;
111
112		if (!files->eval || files->eval(data))
113			debugfs_create_file(files->name,
114					    mode, root, data,
115					    files->fops);
116
117		files++;
118	}
119}