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
24 #include <linux/debugfs.h>
25 #include <linux/list_sort.h>
26
27 #include "gvt.h"
28 #include "i915_drv.h"
29
30 struct mmio_diff_param {
31 struct intel_vgpu *vgpu;
32 int total;
33 int diff;
34 struct list_head diff_mmio_list;
35 };
36
37 struct diff_mmio {
38 struct list_head node;
39 u32 offset;
40 u32 preg;
41 u32 vreg;
42 };
43
44 /* Compare two diff_mmio items. */
mmio_offset_compare(void * priv,const struct list_head * a,const struct list_head * b)45 static int mmio_offset_compare(void *priv,
46 const struct list_head *a, const struct list_head *b)
47 {
48 struct diff_mmio *ma;
49 struct diff_mmio *mb;
50
51 ma = container_of(a, struct diff_mmio, node);
52 mb = container_of(b, struct diff_mmio, node);
53 if (ma->offset < mb->offset)
54 return -1;
55 else if (ma->offset > mb->offset)
56 return 1;
57 return 0;
58 }
59
mmio_diff_handler(struct intel_gvt * gvt,u32 offset,void * data)60 static inline int mmio_diff_handler(struct intel_gvt *gvt,
61 u32 offset, void *data)
62 {
63 struct mmio_diff_param *param = data;
64 struct diff_mmio *node;
65 u32 preg, vreg;
66
67 preg = intel_uncore_read_notrace(gvt->gt->uncore, _MMIO(offset));
68 vreg = vgpu_vreg(param->vgpu, offset);
69
70 if (preg != vreg) {
71 node = kmalloc_obj(*node, GFP_ATOMIC);
72 if (!node)
73 return -ENOMEM;
74
75 node->offset = offset;
76 node->preg = preg;
77 node->vreg = vreg;
78 list_add(&node->node, ¶m->diff_mmio_list);
79 param->diff++;
80 }
81 param->total++;
82 return 0;
83 }
84
85 /* Show the all the different values of tracked mmio. */
vgpu_mmio_diff_show(struct seq_file * s,void * unused)86 static int vgpu_mmio_diff_show(struct seq_file *s, void *unused)
87 {
88 struct intel_vgpu *vgpu = s->private;
89 struct intel_gvt *gvt = vgpu->gvt;
90 struct mmio_diff_param param = {
91 .vgpu = vgpu,
92 .total = 0,
93 .diff = 0,
94 };
95 struct diff_mmio *node, *next;
96 intel_wakeref_t wakeref;
97
98 INIT_LIST_HEAD(¶m.diff_mmio_list);
99
100 mutex_lock(&gvt->lock);
101 spin_lock_bh(&gvt->scheduler.mmio_context_lock);
102
103 wakeref = mmio_hw_access_pre(gvt->gt);
104 /* Recognize all the diff mmios to list. */
105 intel_gvt_for_each_tracked_mmio(gvt, mmio_diff_handler, ¶m);
106 mmio_hw_access_post(gvt->gt, wakeref);
107
108 spin_unlock_bh(&gvt->scheduler.mmio_context_lock);
109 mutex_unlock(&gvt->lock);
110
111 /* In an ascending order by mmio offset. */
112 list_sort(NULL, ¶m.diff_mmio_list, mmio_offset_compare);
113
114 seq_printf(s, "%-8s %-8s %-8s %-8s\n", "Offset", "HW", "vGPU", "Diff");
115 list_for_each_entry_safe(node, next, ¶m.diff_mmio_list, node) {
116 u32 diff = node->preg ^ node->vreg;
117
118 seq_printf(s, "%08x %08x %08x %*pbl\n",
119 node->offset, node->preg, node->vreg,
120 32, &diff);
121 list_del(&node->node);
122 kfree(node);
123 }
124 seq_printf(s, "Total: %d, Diff: %d\n", param.total, param.diff);
125 return 0;
126 }
127 DEFINE_SHOW_ATTRIBUTE(vgpu_mmio_diff);
128
129 static int
vgpu_scan_nonprivbb_get(void * data,u64 * val)130 vgpu_scan_nonprivbb_get(void *data, u64 *val)
131 {
132 struct intel_vgpu *vgpu = (struct intel_vgpu *)data;
133
134 *val = vgpu->scan_nonprivbb;
135 return 0;
136 }
137
138 /*
139 * set/unset bit engine_id of vgpu->scan_nonprivbb to turn on/off scanning
140 * of non-privileged batch buffer. e.g.
141 * if vgpu->scan_nonprivbb=3, then it will scan non-privileged batch buffer
142 * on engine 0 and 1.
143 */
144 static int
vgpu_scan_nonprivbb_set(void * data,u64 val)145 vgpu_scan_nonprivbb_set(void *data, u64 val)
146 {
147 struct intel_vgpu *vgpu = (struct intel_vgpu *)data;
148
149 vgpu->scan_nonprivbb = val;
150 return 0;
151 }
152
153 DEFINE_DEBUGFS_ATTRIBUTE(vgpu_scan_nonprivbb_fops,
154 vgpu_scan_nonprivbb_get, vgpu_scan_nonprivbb_set,
155 "0x%llx\n");
156
vgpu_status_get(void * data,u64 * val)157 static int vgpu_status_get(void *data, u64 *val)
158 {
159 struct intel_vgpu *vgpu = (struct intel_vgpu *)data;
160
161 *val = 0;
162
163 if (test_bit(INTEL_VGPU_STATUS_ATTACHED, vgpu->status))
164 *val |= (1 << INTEL_VGPU_STATUS_ATTACHED);
165 if (test_bit(INTEL_VGPU_STATUS_ACTIVE, vgpu->status))
166 *val |= (1 << INTEL_VGPU_STATUS_ACTIVE);
167
168 return 0;
169 }
170
171 DEFINE_DEBUGFS_ATTRIBUTE(vgpu_status_fops, vgpu_status_get, NULL, "0x%llx\n");
172
173 /**
174 * intel_gvt_debugfs_add_vgpu - register debugfs entries for a vGPU
175 * @vgpu: a vGPU
176 */
intel_gvt_debugfs_add_vgpu(struct intel_vgpu * vgpu)177 void intel_gvt_debugfs_add_vgpu(struct intel_vgpu *vgpu)
178 {
179 char name[16] = "";
180
181 snprintf(name, 16, "vgpu%d", vgpu->id);
182 vgpu->debugfs = debugfs_create_dir(name, vgpu->gvt->debugfs_root);
183
184 debugfs_create_file("mmio_diff", 0444, vgpu->debugfs, vgpu,
185 &vgpu_mmio_diff_fops);
186 debugfs_create_file_unsafe("scan_nonprivbb", 0644, vgpu->debugfs, vgpu,
187 &vgpu_scan_nonprivbb_fops);
188 debugfs_create_file_unsafe("status", 0644, vgpu->debugfs, vgpu,
189 &vgpu_status_fops);
190 }
191
192 /**
193 * intel_gvt_debugfs_remove_vgpu - remove debugfs entries of a vGPU
194 * @vgpu: a vGPU
195 */
intel_gvt_debugfs_remove_vgpu(struct intel_vgpu * vgpu)196 void intel_gvt_debugfs_remove_vgpu(struct intel_vgpu *vgpu)
197 {
198 struct intel_gvt *gvt = vgpu->gvt;
199 struct dentry *debugfs_root = gvt->gt->i915->drm.debugfs_root;
200
201 if (debugfs_root && gvt->debugfs_root) {
202 debugfs_remove_recursive(vgpu->debugfs);
203 vgpu->debugfs = NULL;
204 }
205 }
206
207 /**
208 * intel_gvt_debugfs_init - register gvt debugfs root entry
209 * @gvt: GVT device
210 */
intel_gvt_debugfs_init(struct intel_gvt * gvt)211 void intel_gvt_debugfs_init(struct intel_gvt *gvt)
212 {
213 struct dentry *debugfs_root = gvt->gt->i915->drm.debugfs_root;
214
215 gvt->debugfs_root = debugfs_create_dir("gvt", debugfs_root);
216
217 debugfs_create_ulong("num_tracked_mmio", 0444, gvt->debugfs_root,
218 &gvt->mmio.num_tracked_mmio);
219 }
220
221 /**
222 * intel_gvt_debugfs_clean - remove debugfs entries
223 * @gvt: GVT device
224 */
intel_gvt_debugfs_clean(struct intel_gvt * gvt)225 void intel_gvt_debugfs_clean(struct intel_gvt *gvt)
226 {
227 struct dentry *debugfs_root = gvt->gt->i915->drm.debugfs_root;
228
229 if (debugfs_root) {
230 debugfs_remove_recursive(gvt->debugfs_root);
231 gvt->debugfs_root = NULL;
232 }
233 }
234