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_debugfs.h"
10 #include "intel_gt_engines_debugfs.h"
11 #include "intel_gt_pm_debugfs.h"
12 #include "intel_sseu_debugfs.h"
13 #include "pxp/intel_pxp_debugfs.h"
14 #include "uc/intel_uc_debugfs.h"
15 
16 int intel_gt_debugfs_reset_show(struct intel_gt *gt, u64 *val)
17 {
18 	int ret = intel_gt_terminally_wedged(gt);
19 
20 	switch (ret) {
21 	case -EIO:
22 		*val = 1;
23 		return 0;
24 	case 0:
25 		*val = 0;
26 		return 0;
27 	default:
28 		return ret;
29 	}
30 }
31 
32 int intel_gt_debugfs_reset_store(struct intel_gt *gt, u64 val)
33 {
34 	/* Flush any previous reset before applying for a new one */
35 	wait_event(gt->reset.queue,
36 		   !test_bit(I915_RESET_BACKOFF, &gt->reset.flags));
37 
38 	intel_gt_handle_error(gt, val, I915_ERROR_CAPTURE,
39 			      "Manually reset engine mask to %llx", val);
40 	return 0;
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 	return intel_gt_debugfs_reset_store(data, val);
55 }
56 
57 DEFINE_SIMPLE_ATTRIBUTE(reset_fops, __intel_gt_debugfs_reset_show,
58 			__intel_gt_debugfs_reset_store, "%llu\n");
59 
60 static void gt_debugfs_register(struct intel_gt *gt, struct dentry *root)
61 {
62 	static const struct intel_gt_debugfs_file files[] = {
63 		{ "reset", &reset_fops, NULL },
64 	};
65 
66 	intel_gt_debugfs_register_files(root, files, ARRAY_SIZE(files), gt);
67 }
68 
69 void intel_gt_debugfs_register(struct intel_gt *gt)
70 {
71 	struct dentry *root;
72 
73 	if (!gt->i915->drm.primary->debugfs_root)
74 		return;
75 
76 	root = debugfs_create_dir("gt", gt->i915->drm.primary->debugfs_root);
77 	if (IS_ERR(root))
78 		return;
79 
80 	gt_debugfs_register(gt, root);
81 
82 	intel_gt_engines_debugfs_register(gt, root);
83 	intel_gt_pm_debugfs_register(gt, root);
84 	intel_sseu_debugfs_register(gt, root);
85 
86 	intel_uc_debugfs_register(&gt->uc, root);
87 	intel_pxp_debugfs_register(&gt->pxp, root);
88 }
89 
90 void intel_gt_debugfs_register_files(struct dentry *root,
91 				     const struct intel_gt_debugfs_file *files,
92 				     unsigned long count, void *data)
93 {
94 	while (count--) {
95 		umode_t mode = files->fops->write ? 0644 : 0444;
96 
97 		if (!files->eval || files->eval(data))
98 			debugfs_create_file(files->name,
99 					    mode, root, data,
100 					    files->fops);
101 
102 		files++;
103 	}
104 }
105