xref: /openbmc/linux/drivers/gpu/drm/i915/gvt/debugfs.c (revision 0d3b051a)
1 /*
2  * Copyright(c) 2011-2017 Intel Corporation. All rights reserved.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice (including the next
12  * paragraph) shall be included in all copies or substantial portions of the
13  * Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21  * SOFTWARE.
22  */
23 #include <linux/debugfs.h>
24 #include <linux/list_sort.h>
25 #include "i915_drv.h"
26 #include "gvt.h"
27 
28 struct mmio_diff_param {
29 	struct intel_vgpu *vgpu;
30 	int total;
31 	int diff;
32 	struct list_head diff_mmio_list;
33 };
34 
35 struct diff_mmio {
36 	struct list_head node;
37 	u32 offset;
38 	u32 preg;
39 	u32 vreg;
40 };
41 
42 /* Compare two diff_mmio items. */
43 static int mmio_offset_compare(void *priv,
44 	struct list_head *a, struct list_head *b)
45 {
46 	struct diff_mmio *ma;
47 	struct diff_mmio *mb;
48 
49 	ma = container_of(a, struct diff_mmio, node);
50 	mb = container_of(b, struct diff_mmio, node);
51 	if (ma->offset < mb->offset)
52 		return -1;
53 	else if (ma->offset > mb->offset)
54 		return 1;
55 	return 0;
56 }
57 
58 static inline int mmio_diff_handler(struct intel_gvt *gvt,
59 				    u32 offset, void *data)
60 {
61 	struct mmio_diff_param *param = data;
62 	struct diff_mmio *node;
63 	u32 preg, vreg;
64 
65 	preg = intel_uncore_read_notrace(gvt->gt->uncore, _MMIO(offset));
66 	vreg = vgpu_vreg(param->vgpu, offset);
67 
68 	if (preg != vreg) {
69 		node = kmalloc(sizeof(*node), GFP_ATOMIC);
70 		if (!node)
71 			return -ENOMEM;
72 
73 		node->offset = offset;
74 		node->preg = preg;
75 		node->vreg = vreg;
76 		list_add(&node->node, &param->diff_mmio_list);
77 		param->diff++;
78 	}
79 	param->total++;
80 	return 0;
81 }
82 
83 /* Show the all the different values of tracked mmio. */
84 static int vgpu_mmio_diff_show(struct seq_file *s, void *unused)
85 {
86 	struct intel_vgpu *vgpu = s->private;
87 	struct intel_gvt *gvt = vgpu->gvt;
88 	struct mmio_diff_param param = {
89 		.vgpu = vgpu,
90 		.total = 0,
91 		.diff = 0,
92 	};
93 	struct diff_mmio *node, *next;
94 
95 	INIT_LIST_HEAD(&param.diff_mmio_list);
96 
97 	mutex_lock(&gvt->lock);
98 	spin_lock_bh(&gvt->scheduler.mmio_context_lock);
99 
100 	mmio_hw_access_pre(gvt->gt);
101 	/* Recognize all the diff mmios to list. */
102 	intel_gvt_for_each_tracked_mmio(gvt, mmio_diff_handler, &param);
103 	mmio_hw_access_post(gvt->gt);
104 
105 	spin_unlock_bh(&gvt->scheduler.mmio_context_lock);
106 	mutex_unlock(&gvt->lock);
107 
108 	/* In an ascending order by mmio offset. */
109 	list_sort(NULL, &param.diff_mmio_list, mmio_offset_compare);
110 
111 	seq_printf(s, "%-8s %-8s %-8s %-8s\n", "Offset", "HW", "vGPU", "Diff");
112 	list_for_each_entry_safe(node, next, &param.diff_mmio_list, node) {
113 		u32 diff = node->preg ^ node->vreg;
114 
115 		seq_printf(s, "%08x %08x %08x %*pbl\n",
116 			   node->offset, node->preg, node->vreg,
117 			   32, &diff);
118 		list_del(&node->node);
119 		kfree(node);
120 	}
121 	seq_printf(s, "Total: %d, Diff: %d\n", param.total, param.diff);
122 	return 0;
123 }
124 DEFINE_SHOW_ATTRIBUTE(vgpu_mmio_diff);
125 
126 static int
127 vgpu_scan_nonprivbb_get(void *data, u64 *val)
128 {
129 	struct intel_vgpu *vgpu = (struct intel_vgpu *)data;
130 
131 	*val = vgpu->scan_nonprivbb;
132 	return 0;
133 }
134 
135 /*
136  * set/unset bit engine_id of vgpu->scan_nonprivbb to turn on/off scanning
137  * of non-privileged batch buffer. e.g.
138  * if vgpu->scan_nonprivbb=3, then it will scan non-privileged batch buffer
139  * on engine 0 and 1.
140  */
141 static int
142 vgpu_scan_nonprivbb_set(void *data, u64 val)
143 {
144 	struct intel_vgpu *vgpu = (struct intel_vgpu *)data;
145 
146 	vgpu->scan_nonprivbb = val;
147 	return 0;
148 }
149 
150 DEFINE_SIMPLE_ATTRIBUTE(vgpu_scan_nonprivbb_fops,
151 			vgpu_scan_nonprivbb_get, vgpu_scan_nonprivbb_set,
152 			"0x%llx\n");
153 
154 /**
155  * intel_gvt_debugfs_add_vgpu - register debugfs entries for a vGPU
156  * @vgpu: a vGPU
157  */
158 void intel_gvt_debugfs_add_vgpu(struct intel_vgpu *vgpu)
159 {
160 	char name[16] = "";
161 
162 	snprintf(name, 16, "vgpu%d", vgpu->id);
163 	vgpu->debugfs = debugfs_create_dir(name, vgpu->gvt->debugfs_root);
164 
165 	debugfs_create_bool("active", 0444, vgpu->debugfs, &vgpu->active);
166 	debugfs_create_file("mmio_diff", 0444, vgpu->debugfs, vgpu,
167 			    &vgpu_mmio_diff_fops);
168 	debugfs_create_file("scan_nonprivbb", 0644, vgpu->debugfs, vgpu,
169 			    &vgpu_scan_nonprivbb_fops);
170 }
171 
172 /**
173  * intel_gvt_debugfs_remove_vgpu - remove debugfs entries of a vGPU
174  * @vgpu: a vGPU
175  */
176 void intel_gvt_debugfs_remove_vgpu(struct intel_vgpu *vgpu)
177 {
178 	debugfs_remove_recursive(vgpu->debugfs);
179 	vgpu->debugfs = NULL;
180 }
181 
182 /**
183  * intel_gvt_debugfs_init - register gvt debugfs root entry
184  * @gvt: GVT device
185  */
186 void intel_gvt_debugfs_init(struct intel_gvt *gvt)
187 {
188 	struct drm_minor *minor = gvt->gt->i915->drm.primary;
189 
190 	gvt->debugfs_root = debugfs_create_dir("gvt", minor->debugfs_root);
191 
192 	debugfs_create_ulong("num_tracked_mmio", 0444, gvt->debugfs_root,
193 			     &gvt->mmio.num_tracked_mmio);
194 }
195 
196 /**
197  * intel_gvt_debugfs_clean - remove debugfs entries
198  * @gvt: GVT device
199  */
200 void intel_gvt_debugfs_clean(struct intel_gvt *gvt)
201 {
202 	debugfs_remove_recursive(gvt->debugfs_root);
203 	gvt->debugfs_root = NULL;
204 }
205