Linux kernel mirror (for testing)
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1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2025 Intel Corporation
4 */
5
6#include <linux/debugfs.h>
7#include <drm/drm_debugfs.h>
8
9#include "xe_ggtt.h"
10#include "xe_pm.h"
11#include "xe_sa.h"
12#include "xe_tile_debugfs.h"
13
14static struct xe_tile *node_to_tile(struct drm_info_node *node)
15{
16 return node->dent->d_parent->d_inode->i_private;
17}
18
19/**
20 * xe_tile_debugfs_simple_show() - A show callback for struct drm_info_list
21 * @m: the &seq_file
22 * @data: data used by the drm debugfs helpers
23 *
24 * This callback can be used in struct drm_info_list to describe debugfs
25 * files that are &xe_tile specific.
26 *
27 * It is assumed that those debugfs files will be created on directory entry
28 * which struct dentry d_inode->i_private points to &xe_tile.
29 *
30 * /sys/kernel/debug/dri/0/
31 * ├── tile0/ # tile = dentry->d_inode->i_private
32 * │ │ ├── id # tile = dentry->d_parent->d_inode->i_private
33 *
34 * This function assumes that &m->private will be set to the &struct
35 * drm_info_node corresponding to the instance of the info on a given &struct
36 * drm_minor (see struct drm_info_list.show for details).
37 *
38 * This function also assumes that struct drm_info_list.data will point to the
39 * function code that will actually print a file content::
40 *
41 * int (*print)(struct xe_tile *, struct drm_printer *)
42 *
43 * Example::
44 *
45 * int tile_id(struct xe_tile *tile, struct drm_printer *p)
46 * {
47 * drm_printf(p, "%u\n", tile->id);
48 * return 0;
49 * }
50 *
51 * static const struct drm_info_list info[] = {
52 * { name = "id", .show = tile_debugfs_simple_show, .data = tile_id },
53 * };
54 *
55 * dir = debugfs_create_dir("tile0", parent);
56 * dir->d_inode->i_private = tile;
57 * drm_debugfs_create_files(info, ARRAY_SIZE(info), dir, minor);
58 *
59 * Return: 0 on success or a negative error code on failure.
60 */
61int xe_tile_debugfs_simple_show(struct seq_file *m, void *data)
62{
63 struct drm_printer p = drm_seq_file_printer(m);
64 struct drm_info_node *node = m->private;
65 struct xe_tile *tile = node_to_tile(node);
66 int (*print)(struct xe_tile *, struct drm_printer *) = node->info_ent->data;
67
68 return print(tile, &p);
69}
70
71/**
72 * xe_tile_debugfs_show_with_rpm() - A show callback for struct drm_info_list
73 * @m: the &seq_file
74 * @data: data used by the drm debugfs helpers
75 *
76 * Similar to tile_debugfs_simple_show() but implicitly takes a RPM ref.
77 *
78 * Return: 0 on success or a negative error code on failure.
79 */
80int xe_tile_debugfs_show_with_rpm(struct seq_file *m, void *data)
81{
82 struct drm_info_node *node = m->private;
83 struct xe_tile *tile = node_to_tile(node);
84 struct xe_device *xe = tile_to_xe(tile);
85 int ret;
86
87 xe_pm_runtime_get(xe);
88 ret = xe_tile_debugfs_simple_show(m, data);
89 xe_pm_runtime_put(xe);
90
91 return ret;
92}
93
94static int ggtt(struct xe_tile *tile, struct drm_printer *p)
95{
96 return xe_ggtt_dump(tile->mem.ggtt, p);
97}
98
99static int sa_info(struct xe_tile *tile, struct drm_printer *p)
100{
101 drm_suballoc_dump_debug_info(&tile->mem.kernel_bb_pool->base, p,
102 xe_sa_manager_gpu_addr(tile->mem.kernel_bb_pool));
103
104 return 0;
105}
106
107/* only for debugfs files which can be safely used on the VF */
108static const struct drm_info_list vf_safe_debugfs_list[] = {
109 { "ggtt", .show = xe_tile_debugfs_show_with_rpm, .data = ggtt },
110 { "sa_info", .show = xe_tile_debugfs_show_with_rpm, .data = sa_info },
111};
112
113/**
114 * xe_tile_debugfs_register - Register tile's debugfs attributes
115 * @tile: the &xe_tile to register
116 *
117 * Create debugfs sub-directory with a name that includes a tile ID and
118 * then creates set of debugfs files (attributes) specific to this tile.
119 */
120void xe_tile_debugfs_register(struct xe_tile *tile)
121{
122 struct xe_device *xe = tile_to_xe(tile);
123 struct drm_minor *minor = xe->drm.primary;
124 struct dentry *root = minor->debugfs_root;
125 char name[8];
126
127 snprintf(name, sizeof(name), "tile%u", tile->id);
128 tile->debugfs = debugfs_create_dir(name, root);
129 if (IS_ERR(tile->debugfs))
130 return;
131
132 /*
133 * Store the xe_tile pointer as private data of the tile/ directory
134 * node so other tile specific attributes under that directory may
135 * refer to it by looking at its parent node private data.
136 */
137 tile->debugfs->d_inode->i_private = tile;
138
139 drm_debugfs_create_files(vf_safe_debugfs_list,
140 ARRAY_SIZE(vf_safe_debugfs_list),
141 tile->debugfs, minor);
142}