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
28struct mmio_diff_param {
29	struct intel_vgpu *vgpu;
30	int total;
31	int diff;
32	struct list_head diff_mmio_list;
33};
34
35struct diff_mmio {
36	struct list_head node;
37	u32 offset;
38	u32 preg;
39	u32 vreg;
40};
41
42/* Compare two diff_mmio items. */
43static int mmio_offset_compare(void *priv,
44	const struct list_head *a, const 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
58static 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. */
84static 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}
124DEFINE_SHOW_ATTRIBUTE(vgpu_mmio_diff);
125
126static int
127vgpu_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 */
141static int
142vgpu_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
150DEFINE_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 */
158void 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 */
176void intel_gvt_debugfs_remove_vgpu(struct intel_vgpu *vgpu)
177{
178	struct intel_gvt *gvt = vgpu->gvt;
179	struct drm_minor *minor = gvt->gt->i915->drm.primary;
180
181	if (minor->debugfs_root && gvt->debugfs_root) {
182		debugfs_remove_recursive(vgpu->debugfs);
183		vgpu->debugfs = NULL;
184	}
185}
186
187/**
188 * intel_gvt_debugfs_init - register gvt debugfs root entry
189 * @gvt: GVT device
190 */
191void intel_gvt_debugfs_init(struct intel_gvt *gvt)
192{
193	struct drm_minor *minor = gvt->gt->i915->drm.primary;
194
195	gvt->debugfs_root = debugfs_create_dir("gvt", minor->debugfs_root);
196
197	debugfs_create_ulong("num_tracked_mmio", 0444, gvt->debugfs_root,
198			     &gvt->mmio.num_tracked_mmio);
199}
200
201/**
202 * intel_gvt_debugfs_clean - remove debugfs entries
203 * @gvt: GVT device
204 */
205void intel_gvt_debugfs_clean(struct intel_gvt *gvt)
206{
207	struct drm_minor *minor = gvt->gt->i915->drm.primary;
208
209	if (minor->debugfs_root) {
210		debugfs_remove_recursive(gvt->debugfs_root);
211		gvt->debugfs_root = NULL;
212	}
213}
214