summaryrefslogtreecommitdiffstats
path: root/drivers/bus/mhi/core/debugfs.c
blob: 858d7516410bb75e9aea5692cbc9eed4e9a66400 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2020, The Linux Foundation. All rights reserved.
 *
 */

#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/mhi.h>
#include <linux/module.h>
#include "internal.h"

static int mhi_debugfs_states_show(struct seq_file *m, void *d)
{
	struct mhi_controller *mhi_cntrl = m->private;

	/* states */
	seq_printf(m, "PM state: %s Device: %s MHI state: %s EE: %s wake: %s\n",
		   to_mhi_pm_state_str(mhi_cntrl->pm_state),
		   mhi_is_active(mhi_cntrl) ? "Active" : "Inactive",
		   TO_MHI_STATE_STR(mhi_cntrl->dev_state),
		   TO_MHI_EXEC_STR(mhi_cntrl->ee),
		   mhi_cntrl->wake_set ? "true" : "false");

	/* counters */
	seq_printf(m, "M0: %u M2: %u M3: %u", mhi_cntrl->M0, mhi_cntrl->M2,
		   mhi_cntrl->M3);

	seq_printf(m, " device wake: %u pending packets: %u\n",
		   atomic_read(&mhi_cntrl->dev_wake),
		   atomic_read(&mhi_cntrl->pending_pkts));

	return 0;
}

static int mhi_debugfs_events_show(struct seq_file *m, void *d)
{
	struct mhi_controller *mhi_cntrl = m->private;
	struct mhi_event *mhi_event;
	struct mhi_event_ctxt *er_ctxt;
	int i;

	if (!mhi_is_active(mhi_cntrl)) {
		seq_puts(m, "Device not ready\n");
		return -ENODEV;
	}

	er_ctxt = mhi_cntrl->mhi_ctxt->er_ctxt;
	mhi_event = mhi_cntrl->mhi_event;
	for (i = 0; i < mhi_cntrl->total_ev_rings;
						i++, er_ctxt++, mhi_event++) {
		struct mhi_ring *ring = &mhi_event->ring;

		if (mhi_event->offload_ev) {
			seq_printf(m, "Index: %d is an offload event ring\n",
				   i);
			continue;
		}

		seq_printf(m, "Index: %d intmod count: %lu time: %lu",
			   i, (er_ctxt->intmod & EV_CTX_INTMODC_MASK) >>
			   EV_CTX_INTMODC_SHIFT,
			   (er_ctxt->intmod & EV_CTX_INTMODT_MASK) >>
			   EV_CTX_INTMODT_SHIFT);

		seq_printf(m, " base: 0x%0llx len: 0x%llx", er_ctxt->rbase,
			   er_ctxt->rlen);

		seq_printf(m, " rp: 0x%llx wp: 0x%llx", er_ctxt->rp,
			   er_ctxt->wp);

		seq_printf(m, " local rp: 0x%pK db: 0x%pad\n", ring->rp,
			   &mhi_event->db_cfg.db_val);
	}

	return 0;
}

static int mhi_debugfs_channels_show(struct seq_file *m, void *d)
{
	struct mhi_controller *mhi_cntrl = m->private;
	struct mhi_chan *mhi_chan;
	struct mhi_chan_ctxt *chan_ctxt;
	int i;

	if (!mhi_is_active(mhi_cntrl)) {
		seq_puts(m, "Device not ready\n");
		return -ENODEV;
	}

	mhi_chan = mhi_cntrl->mhi_chan;
	chan_ctxt = mhi_cntrl->mhi_ctxt->chan_ctxt;
	for (i = 0; i < mhi_cntrl->max_chan; i++, chan_ctxt++, mhi_chan++) {
		struct mhi_ring *ring = &mhi_chan->tre_ring;

		if (mhi_chan->offload_ch) {
			seq_printf(m, "%s(%u) is an offload channel\n",
				   mhi_chan->name, mhi_chan->chan);
			continue;
		}

		if (!mhi_chan->mhi_dev)
			continue;

		seq_printf(m,
			   "%s(%u) state: 0x%lx brstmode: 0x%lx pollcfg: 0x%lx",
			   mhi_chan->name, mhi_chan->chan, (chan_ctxt->chcfg &
			   CHAN_CTX_CHSTATE_MASK) >> CHAN_CTX_CHSTATE_SHIFT,
			   (chan_ctxt->chcfg & CHAN_CTX_BRSTMODE_MASK) >>
			   CHAN_CTX_BRSTMODE_SHIFT, (chan_ctxt->chcfg &
			   CHAN_CTX_POLLCFG_MASK) >> CHAN_CTX_POLLCFG_SHIFT);

		seq_printf(m, " type: 0x%x event ring: %u", chan_ctxt->chtype,
			   chan_ctxt->erindex);

		seq_printf(m, " base: 0x%llx len: 0x%llx rp: 0x%llx wp: 0x%llx",
			   chan_ctxt->rbase, chan_ctxt->rlen, chan_ctxt->rp,
			   chan_ctxt->wp);

		seq_printf(m, " local rp: 0x%pK local wp: 0x%pK db: 0x%pad\n",
			   ring->rp, ring->wp,
			   &mhi_chan->db_cfg.db_val);
	}

	return 0;
}

static int mhi_device_info_show(struct device *dev, void *data)
{
	struct mhi_device *mhi_dev;

	if (dev->bus != &mhi_bus_type)
		return 0;

	mhi_dev = to_mhi_device(dev);

	seq_printf((struct seq_file *)data, "%s: type: %s dev_wake: %u",
		   mhi_dev->name, mhi_dev->dev_type ? "Controller" : "Transfer",
		   mhi_dev->dev_wake);

	/* for transfer device types only */
	if (mhi_dev->dev_type == MHI_DEVICE_XFER)
		seq_printf((struct seq_file *)data, " channels: %u(UL)/%u(DL)",
			   mhi_dev->ul_chan_id, mhi_dev->dl_chan_id);

	seq_puts((struct seq_file *)data, "\n");

	return 0;
}

static int mhi_debugfs_devices_show(struct seq_file *m, void *d)
{
	struct mhi_controller *mhi_cntrl = m->private;

	if (!mhi_is_active(mhi_cntrl)) {
		seq_puts(m, "Device not ready\n");
		return -ENODEV;
	}

	/* Show controller and client(s) info */
	mhi_device_info_show(&mhi_cntrl->mhi_dev->dev, m);
	device_for_each_child(&mhi_cntrl->mhi_dev->dev, m, mhi_device_info_show);

	return 0;
}

static int mhi_debugfs_regdump_show(struct seq_file *m, void *d)
{
	struct mhi_controller *mhi_cntrl = m->private;
	enum mhi_state state;
	enum mhi_ee_type ee;
	int i, ret = -EIO;
	u32 val;
	void __iomem *mhi_base = mhi_cntrl->regs;
	void __iomem *bhi_base = mhi_cntrl->bhi;
	void __iomem *bhie_base = mhi_cntrl->bhie;
	void __iomem *wake_db = mhi_cntrl->wake_db;
	struct {
		const char *name;
		int offset;
		void __iomem *base;
	} regs[] = {
		{ "MHI_REGLEN", MHIREGLEN, mhi_base},
		{ "MHI_VER", MHIVER, mhi_base},
		{ "MHI_CFG", MHICFG, mhi_base},
		{ "MHI_CTRL", MHICTRL, mhi_base},
		{ "MHI_STATUS", MHISTATUS, mhi_base},
		{ "MHI_WAKE_DB", 0, wake_db},
		{ "BHI_EXECENV", BHI_EXECENV, bhi_base},
		{ "BHI_STATUS", BHI_STATUS, bhi_base},
		{ "BHI_ERRCODE", BHI_ERRCODE, bhi_base},
		{ "BHI_ERRDBG1", BHI_ERRDBG1, bhi_base},
		{ "BHI_ERRDBG2", BHI_ERRDBG2, bhi_base},
		{ "BHI_ERRDBG3", BHI_ERRDBG3, bhi_base},
		{ "BHIE_TXVEC_DB", BHIE_TXVECDB_OFFS, bhie_base},
		{ "BHIE_TXVEC_STATUS", BHIE_TXVECSTATUS_OFFS, bhie_base},
		{ "BHIE_RXVEC_DB", BHIE_RXVECDB_OFFS, bhie_base},
		{ "BHIE_RXVEC_STATUS", BHIE_RXVECSTATUS_OFFS, bhie_base},
		{ NULL },
	};

	if (!MHI_REG_ACCESS_VALID(mhi_cntrl->pm_state))
		return ret;

	seq_printf(m, "Host PM state: %s Device state: %s EE: %s\n",
		   to_mhi_pm_state_str(mhi_cntrl->pm_state),
		   TO_MHI_STATE_STR(mhi_cntrl->dev_state),
		   TO_MHI_EXEC_STR(mhi_cntrl->ee));

	state = mhi_get_mhi_state(mhi_cntrl);
	ee = mhi_get_exec_env(mhi_cntrl);
	seq_printf(m, "Device EE: %s state: %s\n", TO_MHI_EXEC_STR(ee),
		   TO_MHI_STATE_STR(state));

	for (i = 0; regs[i].name; i++) {
		if (!regs[i].base)
			continue;
		ret = mhi_read_reg(mhi_cntrl, regs[i].base, regs[i].offset,
				   &val);
		if (ret)
			continue;

		seq_printf(m, "%s: 0x%x\n", regs[i].name, val);
	}

	return 0;
}

static int mhi_debugfs_device_wake_show(struct seq_file *m, void *d)
{
	struct mhi_controller *mhi_cntrl = m->private;
	struct mhi_device *mhi_dev = mhi_cntrl->mhi_dev;

	if (!mhi_is_active(mhi_cntrl)) {
		seq_puts(m, "Device not ready\n");
		return -ENODEV;
	}

	seq_printf(m,
		   "Wake count: %d\n%s\n", mhi_dev->dev_wake,
		   "Usage: echo get/put > device_wake to vote/unvote for M0");

	return 0;
}

static ssize_t mhi_debugfs_device_wake_write(struct file *file,
					     const char __user *ubuf,
					     size_t count, loff_t *ppos)
{
	struct seq_file	*m = file->private_data;
	struct mhi_controller *mhi_cntrl = m->private;
	struct mhi_device *mhi_dev = mhi_cntrl->mhi_dev;
	char buf[16];
	int ret = -EINVAL;

	if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
		return -EFAULT;

	if (!strncmp(buf, "get", 3)) {
		ret = mhi_device_get_sync(mhi_dev);
	} else if (!strncmp(buf, "put", 3)) {
		mhi_device_put(mhi_dev);
		ret = 0;
	}

	return ret ? ret : count;
}

static int mhi_debugfs_timeout_ms_show(struct seq_file *m, void *d)
{
	struct mhi_controller *mhi_cntrl = m->private;

	seq_printf(m, "%u ms\n", mhi_cntrl->timeout_ms);

	return 0;
}

static ssize_t mhi_debugfs_timeout_ms_write(struct file *file,
					    const char __user *ubuf,
					    size_t count, loff_t *ppos)
{
	struct seq_file	*m = file->private_data;
	struct mhi_controller *mhi_cntrl = m->private;
	u32 timeout_ms;

	if (kstrtou32_from_user(ubuf, count, 0, &timeout_ms))
		return -EINVAL;

	mhi_cntrl->timeout_ms = timeout_ms;

	return count;
}

static int mhi_debugfs_states_open(struct inode *inode, struct file *fp)
{
	return single_open(fp, mhi_debugfs_states_show, inode->i_private);
}

static int mhi_debugfs_events_open(struct inode *inode, struct file *fp)
{
	return single_open(fp, mhi_debugfs_events_show, inode->i_private);
}

static int mhi_debugfs_channels_open(struct inode *inode, struct file *fp)
{
	return single_open(fp, mhi_debugfs_channels_show, inode->i_private);
}

static int mhi_debugfs_devices_open(struct inode *inode, struct file *fp)
{
	return single_open(fp, mhi_debugfs_devices_show, inode->i_private);
}

static int mhi_debugfs_regdump_open(struct inode *inode, struct file *fp)
{
	return single_open(fp, mhi_debugfs_regdump_show, inode->i_private);
}

static int mhi_debugfs_device_wake_open(struct inode *inode, struct file *fp)
{
	return single_open(fp, mhi_debugfs_device_wake_show, inode->i_private);
}

static int mhi_debugfs_timeout_ms_open(struct inode *inode, struct file *fp)
{
	return single_open(fp, mhi_debugfs_timeout_ms_show, inode->i_private);
}

static const struct file_operations debugfs_states_fops = {
	.open = mhi_debugfs_states_open,
	.release = single_release,
	.read = seq_read,
};

static const struct file_operations debugfs_events_fops = {
	.open = mhi_debugfs_events_open,
	.release = single_release,
	.read = seq_read,
};

static const struct file_operations debugfs_channels_fops = {
	.open = mhi_debugfs_channels_open,
	.release = single_release,
	.read = seq_read,
};

static const struct file_operations debugfs_devices_fops = {
	.open = mhi_debugfs_devices_open,
	.release = single_release,
	.read = seq_read,
};

static const struct file_operations debugfs_regdump_fops = {
	.open = mhi_debugfs_regdump_open,
	.release = single_release,
	.read = seq_read,
};

static const struct file_operations debugfs_device_wake_fops = {
	.open = mhi_debugfs_device_wake_open,
	.write = mhi_debugfs_device_wake_write,
	.release = single_release,
	.read = seq_read,
};

static const struct file_operations debugfs_timeout_ms_fops = {
	.open = mhi_debugfs_timeout_ms_open,
	.write = mhi_debugfs_timeout_ms_write,
	.release = single_release,
	.read = seq_read,
};

static struct dentry *mhi_debugfs_root;

void mhi_create_debugfs(struct mhi_controller *mhi_cntrl)
{
	mhi_cntrl->debugfs_dentry =
			debugfs_create_dir(dev_name(&mhi_cntrl->mhi_dev->dev),
					   mhi_debugfs_root);

	debugfs_create_file("states", 0444, mhi_cntrl->debugfs_dentry,
			    mhi_cntrl, &debugfs_states_fops);
	debugfs_create_file("events", 0444, mhi_cntrl->debugfs_dentry,
			    mhi_cntrl, &debugfs_events_fops);
	debugfs_create_file("channels", 0444, mhi_cntrl->debugfs_dentry,
			    mhi_cntrl, &debugfs_channels_fops);
	debugfs_create_file("devices", 0444, mhi_cntrl->debugfs_dentry,
			    mhi_cntrl, &debugfs_devices_fops);
	debugfs_create_file("regdump", 0444, mhi_cntrl->debugfs_dentry,
			    mhi_cntrl, &debugfs_regdump_fops);
	debugfs_create_file("device_wake", 0644, mhi_cntrl->debugfs_dentry,
			    mhi_cntrl, &debugfs_device_wake_fops);
	debugfs_create_file("timeout_ms", 0644, mhi_cntrl->debugfs_dentry,
			    mhi_cntrl, &debugfs_timeout_ms_fops);
}

void mhi_destroy_debugfs(struct mhi_controller *mhi_cntrl)
{
	debugfs_remove_recursive(mhi_cntrl->debugfs_dentry);
	mhi_cntrl->debugfs_dentry = NULL;
}

void mhi_debugfs_init(void)
{
	mhi_debugfs_root = debugfs_create_dir(mhi_bus_type.name, NULL);
}

void mhi_debugfs_exit(void)
{
	debugfs_remove_recursive(mhi_debugfs_root);
}