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 
17 int 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 
33 void 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  */
47 static int __intel_gt_debugfs_reset_show(void *data, u64 *val)
48 {
49 	return intel_gt_debugfs_reset_show(data, val);
50 }
51 
52 static 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 
59 DEFINE_SIMPLE_ATTRIBUTE(reset_fops, __intel_gt_debugfs_reset_show,
60 			__intel_gt_debugfs_reset_store, "%llu\n");
61 
62 static 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 }
71 DEFINE_INTEL_GT_DEBUGFS_ATTRIBUTE(steering);
72 
73 static 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 
83 void 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 
105 void 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 }
120