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. */
mmio_offset_compare(void * priv,const struct list_head * a,const struct list_head * b)43 static 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
mmio_diff_handler(struct intel_gvt * gvt,u32 offset,void * data)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, ¶m->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. */
vgpu_mmio_diff_show(struct seq_file * s,void * unused)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(¶m.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, ¶m);
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, ¶m.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, ¶m.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
vgpu_scan_nonprivbb_get(void * data,u64 * val)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
vgpu_scan_nonprivbb_set(void * data,u64 val)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 */
intel_gvt_debugfs_add_vgpu(struct intel_vgpu * vgpu)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 */
intel_gvt_debugfs_remove_vgpu(struct intel_vgpu * vgpu)176 void 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 */
intel_gvt_debugfs_init(struct intel_gvt * gvt)191 void 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 */
intel_gvt_debugfs_clean(struct intel_gvt * gvt)205 void 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