debugfs.c

  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	intel_wakeref_t wakeref;
 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	wakeref = mmio_hw_access_pre(gvt->gt);
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->gt, wakeref);
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
132	*val = vgpu->scan_nonprivbb;
133	return 0;
134}
135
136/*
137 * set/unset bit engine_id of vgpu->scan_nonprivbb to turn on/off scanning
138 * of non-privileged batch buffer. e.g.
139 * if vgpu->scan_nonprivbb=3, then it will scan non-privileged batch buffer
140 * on engine 0 and 1.
141 */
142static int
143vgpu_scan_nonprivbb_set(void *data, u64 val)
144{
145	struct intel_vgpu *vgpu = (struct intel_vgpu *)data;
146
147	vgpu->scan_nonprivbb = val;
148	return 0;
149}
150
151DEFINE_DEBUGFS_ATTRIBUTE(vgpu_scan_nonprivbb_fops,
152			 vgpu_scan_nonprivbb_get, vgpu_scan_nonprivbb_set,
153			 "0x%llx\n");
154
155static int vgpu_status_get(void *data, u64 *val)
156{
157	struct intel_vgpu *vgpu = (struct intel_vgpu *)data;
158
159	*val = 0;
160
161	if (test_bit(INTEL_VGPU_STATUS_ATTACHED, vgpu->status))
162		*val |= (1 << INTEL_VGPU_STATUS_ATTACHED);
163	if (test_bit(INTEL_VGPU_STATUS_ACTIVE, vgpu->status))
164		*val |= (1 << INTEL_VGPU_STATUS_ACTIVE);
165
166	return 0;
167}
168
169DEFINE_DEBUGFS_ATTRIBUTE(vgpu_status_fops, vgpu_status_get, NULL, "0x%llx\n");
170
171/**
172 * intel_gvt_debugfs_add_vgpu - register debugfs entries for a vGPU
173 * @vgpu: a vGPU
174 */
175void intel_gvt_debugfs_add_vgpu(struct intel_vgpu *vgpu)
176{
177	char name[16] = "";
178
179	snprintf(name, 16, "vgpu%d", vgpu->id);
180	vgpu->debugfs = debugfs_create_dir(name, vgpu->gvt->debugfs_root);
181
182	debugfs_create_file("mmio_diff", 0444, vgpu->debugfs, vgpu,
183			    &vgpu_mmio_diff_fops);
184	debugfs_create_file_unsafe("scan_nonprivbb", 0644, vgpu->debugfs, vgpu,
185				   &vgpu_scan_nonprivbb_fops);
186	debugfs_create_file_unsafe("status", 0644, vgpu->debugfs, vgpu,
187				   &vgpu_status_fops);
188}
189
190/**
191 * intel_gvt_debugfs_remove_vgpu - remove debugfs entries of a vGPU
192 * @vgpu: a vGPU
193 */
194void intel_gvt_debugfs_remove_vgpu(struct intel_vgpu *vgpu)
195{
196	struct intel_gvt *gvt = vgpu->gvt;
197	struct dentry *debugfs_root = gvt->gt->i915->drm.debugfs_root;
198
199	if (debugfs_root && gvt->debugfs_root) {
200		debugfs_remove_recursive(vgpu->debugfs);
201		vgpu->debugfs = NULL;
202	}
203}
204
205/**
206 * intel_gvt_debugfs_init - register gvt debugfs root entry
207 * @gvt: GVT device
208 */
209void intel_gvt_debugfs_init(struct intel_gvt *gvt)
210{
211	struct dentry *debugfs_root = gvt->gt->i915->drm.debugfs_root;
212
213	gvt->debugfs_root = debugfs_create_dir("gvt", debugfs_root);
214
215	debugfs_create_ulong("num_tracked_mmio", 0444, gvt->debugfs_root,
216			     &gvt->mmio.num_tracked_mmio);
217}
218
219/**
220 * intel_gvt_debugfs_clean - remove debugfs entries
221 * @gvt: GVT device
222 */
223void intel_gvt_debugfs_clean(struct intel_gvt *gvt)
224{
225	struct dentry *debugfs_root = gvt->gt->i915->drm.debugfs_root;
226
227	if (debugfs_root) {
228		debugfs_remove_recursive(gvt->debugfs_root);
229		gvt->debugfs_root = NULL;
230	}
231}