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 *dev_priv = gvt->dev_priv;
 62	struct mmio_diff_param *param = data;
 63	struct diff_mmio *node;
 64	u32 preg, vreg;
 65
 66	preg = I915_READ_NOTRACE(_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}
125
126static int vgpu_mmio_diff_open(struct inode *inode, struct file *file)
127{
128	return single_open(file, vgpu_mmio_diff_show, inode->i_private);
129}
130
131static const struct file_operations vgpu_mmio_diff_fops = {
132	.open		= vgpu_mmio_diff_open,
133	.read		= seq_read,
134	.llseek		= seq_lseek,
135	.release	= single_release,
136};
137
138/**
139 * intel_gvt_debugfs_add_vgpu - register debugfs entries for a vGPU
140 * @vgpu: a vGPU
141 *
142 * Returns:
143 * Zero on success, negative error code if failed.
144 */
145int intel_gvt_debugfs_add_vgpu(struct intel_vgpu *vgpu)
146{
147	struct dentry *ent;
148	char name[10] = "";
149
150	sprintf(name, "vgpu%d", vgpu->id);
151	vgpu->debugfs = debugfs_create_dir(name, vgpu->gvt->debugfs_root);
152	if (!vgpu->debugfs)
153		return -ENOMEM;
154
155	ent = debugfs_create_bool("active", 0444, vgpu->debugfs,
156				  &vgpu->active);
157	if (!ent)
158		return -ENOMEM;
159
160	ent = debugfs_create_file("mmio_diff", 0444, vgpu->debugfs,
161				  vgpu, &vgpu_mmio_diff_fops);
162	if (!ent)
163		return -ENOMEM;
164
165	return 0;
166}
167
168/**
169 * intel_gvt_debugfs_remove_vgpu - remove debugfs entries of a vGPU
170 * @vgpu: a vGPU
171 */
172void intel_gvt_debugfs_remove_vgpu(struct intel_vgpu *vgpu)
173{
174	debugfs_remove_recursive(vgpu->debugfs);
175	vgpu->debugfs = NULL;
176}
177
178/**
179 * intel_gvt_debugfs_init - register gvt debugfs root entry
180 * @gvt: GVT device
181 *
182 * Returns:
183 * zero on success, negative if failed.
184 */
185int intel_gvt_debugfs_init(struct intel_gvt *gvt)
186{
187	struct drm_minor *minor = gvt->dev_priv->drm.primary;
188	struct dentry *ent;
189
190	gvt->debugfs_root = debugfs_create_dir("gvt", minor->debugfs_root);
191	if (!gvt->debugfs_root) {
192		gvt_err("Cannot create debugfs dir\n");
193		return -ENOMEM;
194	}
195
196	ent = debugfs_create_ulong("num_tracked_mmio", 0444, gvt->debugfs_root,
197				   &gvt->mmio.num_tracked_mmio);
198	if (!ent)
199		return -ENOMEM;
200
201	return 0;
202}
203
204/**
205 * intel_gvt_debugfs_clean - remove debugfs entries
206 * @gvt: GVT device
207 */
208void intel_gvt_debugfs_clean(struct intel_gvt *gvt)
209{
210	debugfs_remove_recursive(gvt->debugfs_root);
211	gvt->debugfs_root = NULL;
212}