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	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
 58static inline int mmio_diff_handler(struct intel_gvt *gvt,
 59				    u32 offset, void *data)
 60{
 61	struct drm_i915_private *i915 = gvt->dev_priv;
 62	struct mmio_diff_param *param = data;
 63	struct diff_mmio *node;
 64	u32 preg, vreg;
 65
 66	preg = intel_uncore_read_notrace(&i915->uncore, _MMIO(offset));
 67	vreg = vgpu_vreg(param->vgpu, offset);
 68
 69	if (preg != vreg) {
 70		node = kmalloc(sizeof(*node), GFP_KERNEL);
 71		if (!node)
 72			return -ENOMEM;
 73
 74		node->offset = offset;
 75		node->preg = preg;
 76		node->vreg = vreg;
 77		list_add(&node->node, &param->diff_mmio_list);
 78		param->diff++;
 79	}
 80	param->total++;
 81	return 0;
 82}
 83
 84/* Show the all the different values of tracked mmio. */
 85static int vgpu_mmio_diff_show(struct seq_file *s, void *unused)
 86{
 87	struct intel_vgpu *vgpu = s->private;
 88	struct intel_gvt *gvt = vgpu->gvt;
 89	struct mmio_diff_param param = {
 90		.vgpu = vgpu,
 91		.total = 0,
 92		.diff = 0,
 93	};
 94	struct diff_mmio *node, *next;
 95
 96	INIT_LIST_HEAD(&param.diff_mmio_list);
 97
 98	mutex_lock(&gvt->lock);
 99	spin_lock_bh(&gvt->scheduler.mmio_context_lock);
100
101	mmio_hw_access_pre(gvt->dev_priv);
102	/* Recognize all the diff mmios to list. */
103	intel_gvt_for_each_tracked_mmio(gvt, mmio_diff_handler, &param);
104	mmio_hw_access_post(gvt->dev_priv);
105
106	spin_unlock_bh(&gvt->scheduler.mmio_context_lock);
107	mutex_unlock(&gvt->lock);
108
109	/* In an ascending order by mmio offset. */
110	list_sort(NULL, &param.diff_mmio_list, mmio_offset_compare);
111
112	seq_printf(s, "%-8s %-8s %-8s %-8s\n", "Offset", "HW", "vGPU", "Diff");
113	list_for_each_entry_safe(node, next, &param.diff_mmio_list, node) {
114		u32 diff = node->preg ^ node->vreg;
115
116		seq_printf(s, "%08x %08x %08x %*pbl\n",
117			   node->offset, node->preg, node->vreg,
118			   32, &diff);
119		list_del(&node->node);
120		kfree(node);
121	}
122	seq_printf(s, "Total: %d, Diff: %d\n", param.total, param.diff);
123	return 0;
124}
125DEFINE_SHOW_ATTRIBUTE(vgpu_mmio_diff);
126
127static int
128vgpu_scan_nonprivbb_get(void *data, u64 *val)
129{
130	struct intel_vgpu *vgpu = (struct intel_vgpu *)data;
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	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
146	enum intel_engine_id id;
147	char buf[128], *s;
148	int len;
149
150	val &= (1 << I915_NUM_ENGINES) - 1;
151
152	if (vgpu->scan_nonprivbb == val)
153		return 0;
154
155	if (!val)
156		goto done;
157
158	len = sprintf(buf,
159		"gvt: vgpu %d turns on non-privileged batch buffers scanning on Engines:",
160		vgpu->id);
161
162	s = buf + len;
163
164	for (id = 0; id < I915_NUM_ENGINES; id++) {
165		struct intel_engine_cs *engine;
166
167		engine = dev_priv->engine[id];
168		if (engine && (val & (1 << id))) {
169			len = snprintf(s, 4, "%d, ", engine->id);
170			s += len;
171		} else
172			val &=  ~(1 << id);
173	}
174
175	if (val)
176		sprintf(s, "low performance expected.");
177
178	pr_warn("%s\n", buf);
179
180done:
181	vgpu->scan_nonprivbb = val;
182	return 0;
183}
184
185DEFINE_SIMPLE_ATTRIBUTE(vgpu_scan_nonprivbb_fops,
186			vgpu_scan_nonprivbb_get, vgpu_scan_nonprivbb_set,
187			"0x%llx\n");
188
189/**
190 * intel_gvt_debugfs_add_vgpu - register debugfs entries for a vGPU
191 * @vgpu: a vGPU
192 */
193void intel_gvt_debugfs_add_vgpu(struct intel_vgpu *vgpu)
194{
195	char name[16] = "";
196
197	snprintf(name, 16, "vgpu%d", vgpu->id);
198	vgpu->debugfs = debugfs_create_dir(name, vgpu->gvt->debugfs_root);
199
200	debugfs_create_bool("active", 0444, vgpu->debugfs, &vgpu->active);
201	debugfs_create_file("mmio_diff", 0444, vgpu->debugfs, vgpu,
202			    &vgpu_mmio_diff_fops);
203	debugfs_create_file("scan_nonprivbb", 0644, vgpu->debugfs, vgpu,
204			    &vgpu_scan_nonprivbb_fops);
205}
206
207/**
208 * intel_gvt_debugfs_remove_vgpu - remove debugfs entries of a vGPU
209 * @vgpu: a vGPU
210 */
211void intel_gvt_debugfs_remove_vgpu(struct intel_vgpu *vgpu)
212{
213	debugfs_remove_recursive(vgpu->debugfs);
214	vgpu->debugfs = NULL;
215}
216
217/**
218 * intel_gvt_debugfs_init - register gvt debugfs root entry
219 * @gvt: GVT device
220 */
221void intel_gvt_debugfs_init(struct intel_gvt *gvt)
222{
223	struct drm_minor *minor = gvt->dev_priv->drm.primary;
224
225	gvt->debugfs_root = debugfs_create_dir("gvt", minor->debugfs_root);
226
227	debugfs_create_ulong("num_tracked_mmio", 0444, gvt->debugfs_root,
228			     &gvt->mmio.num_tracked_mmio);
229}
230
231/**
232 * intel_gvt_debugfs_clean - remove debugfs entries
233 * @gvt: GVT device
234 */
235void intel_gvt_debugfs_clean(struct intel_gvt *gvt)
236{
237	debugfs_remove_recursive(gvt->debugfs_root);
238	gvt->debugfs_root = NULL;
239}