1
2
3
4
5
6
7#include <linux/debugfs.h>
8#include <linux/device.h>
9#include <linux/interrupt.h>
10#include <linux/list.h>
11#include <linux/mhi.h>
12#include <linux/module.h>
13#include "internal.h"
14
15static int mhi_debugfs_states_show(struct seq_file *m, void *d)
16{
17 struct mhi_controller *mhi_cntrl = m->private;
18
19
20 seq_printf(m, "PM state: %s Device: %s MHI state: %s EE: %s wake: %s\n",
21 to_mhi_pm_state_str(mhi_cntrl->pm_state),
22 mhi_is_active(mhi_cntrl) ? "Active" : "Inactive",
23 TO_MHI_STATE_STR(mhi_cntrl->dev_state),
24 TO_MHI_EXEC_STR(mhi_cntrl->ee),
25 mhi_cntrl->wake_set ? "true" : "false");
26
27
28 seq_printf(m, "M0: %u M2: %u M3: %u", mhi_cntrl->M0, mhi_cntrl->M2,
29 mhi_cntrl->M3);
30
31 seq_printf(m, " device wake: %u pending packets: %u\n",
32 atomic_read(&mhi_cntrl->dev_wake),
33 atomic_read(&mhi_cntrl->pending_pkts));
34
35 return 0;
36}
37
38static int mhi_debugfs_events_show(struct seq_file *m, void *d)
39{
40 struct mhi_controller *mhi_cntrl = m->private;
41 struct mhi_event *mhi_event;
42 struct mhi_event_ctxt *er_ctxt;
43 int i;
44
45 if (!mhi_is_active(mhi_cntrl)) {
46 seq_puts(m, "Device not ready\n");
47 return -ENODEV;
48 }
49
50 er_ctxt = mhi_cntrl->mhi_ctxt->er_ctxt;
51 mhi_event = mhi_cntrl->mhi_event;
52 for (i = 0; i < mhi_cntrl->total_ev_rings;
53 i++, er_ctxt++, mhi_event++) {
54 struct mhi_ring *ring = &mhi_event->ring;
55
56 if (mhi_event->offload_ev) {
57 seq_printf(m, "Index: %d is an offload event ring\n",
58 i);
59 continue;
60 }
61
62 seq_printf(m, "Index: %d intmod count: %lu time: %lu",
63 i, (er_ctxt->intmod & EV_CTX_INTMODC_MASK) >>
64 EV_CTX_INTMODC_SHIFT,
65 (er_ctxt->intmod & EV_CTX_INTMODT_MASK) >>
66 EV_CTX_INTMODT_SHIFT);
67
68 seq_printf(m, " base: 0x%0llx len: 0x%llx", er_ctxt->rbase,
69 er_ctxt->rlen);
70
71 seq_printf(m, " rp: 0x%llx wp: 0x%llx", er_ctxt->rp,
72 er_ctxt->wp);
73
74 seq_printf(m, " local rp: 0x%pK db: 0x%pad\n", ring->rp,
75 &mhi_event->db_cfg.db_val);
76 }
77
78 return 0;
79}
80
81static int mhi_debugfs_channels_show(struct seq_file *m, void *d)
82{
83 struct mhi_controller *mhi_cntrl = m->private;
84 struct mhi_chan *mhi_chan;
85 struct mhi_chan_ctxt *chan_ctxt;
86 int i;
87
88 if (!mhi_is_active(mhi_cntrl)) {
89 seq_puts(m, "Device not ready\n");
90 return -ENODEV;
91 }
92
93 mhi_chan = mhi_cntrl->mhi_chan;
94 chan_ctxt = mhi_cntrl->mhi_ctxt->chan_ctxt;
95 for (i = 0; i < mhi_cntrl->max_chan; i++, chan_ctxt++, mhi_chan++) {
96 struct mhi_ring *ring = &mhi_chan->tre_ring;
97
98 if (mhi_chan->offload_ch) {
99 seq_printf(m, "%s(%u) is an offload channel\n",
100 mhi_chan->name, mhi_chan->chan);
101 continue;
102 }
103
104 if (!mhi_chan->mhi_dev)
105 continue;
106
107 seq_printf(m,
108 "%s(%u) state: 0x%lx brstmode: 0x%lx pollcfg: 0x%lx",
109 mhi_chan->name, mhi_chan->chan, (chan_ctxt->chcfg &
110 CHAN_CTX_CHSTATE_MASK) >> CHAN_CTX_CHSTATE_SHIFT,
111 (chan_ctxt->chcfg & CHAN_CTX_BRSTMODE_MASK) >>
112 CHAN_CTX_BRSTMODE_SHIFT, (chan_ctxt->chcfg &
113 CHAN_CTX_POLLCFG_MASK) >> CHAN_CTX_POLLCFG_SHIFT);
114
115 seq_printf(m, " type: 0x%x event ring: %u", chan_ctxt->chtype,
116 chan_ctxt->erindex);
117
118 seq_printf(m, " base: 0x%llx len: 0x%llx rp: 0x%llx wp: 0x%llx",
119 chan_ctxt->rbase, chan_ctxt->rlen, chan_ctxt->rp,
120 chan_ctxt->wp);
121
122 seq_printf(m, " local rp: 0x%pK local wp: 0x%pK db: 0x%pad\n",
123 ring->rp, ring->wp,
124 &mhi_chan->db_cfg.db_val);
125 }
126
127 return 0;
128}
129
130static int mhi_device_info_show(struct device *dev, void *data)
131{
132 struct mhi_device *mhi_dev;
133
134 if (dev->bus != &mhi_bus_type)
135 return 0;
136
137 mhi_dev = to_mhi_device(dev);
138
139 seq_printf((struct seq_file *)data, "%s: type: %s dev_wake: %u",
140 mhi_dev->name, mhi_dev->dev_type ? "Controller" : "Transfer",
141 mhi_dev->dev_wake);
142
143
144 if (mhi_dev->dev_type == MHI_DEVICE_XFER)
145 seq_printf((struct seq_file *)data, " channels: %u(UL)/%u(DL)",
146 mhi_dev->ul_chan_id, mhi_dev->dl_chan_id);
147
148 seq_puts((struct seq_file *)data, "\n");
149
150 return 0;
151}
152
153static int mhi_debugfs_devices_show(struct seq_file *m, void *d)
154{
155 struct mhi_controller *mhi_cntrl = m->private;
156
157 if (!mhi_is_active(mhi_cntrl)) {
158 seq_puts(m, "Device not ready\n");
159 return -ENODEV;
160 }
161
162
163 mhi_device_info_show(&mhi_cntrl->mhi_dev->dev, m);
164 device_for_each_child(&mhi_cntrl->mhi_dev->dev, m, mhi_device_info_show);
165
166 return 0;
167}
168
169static int mhi_debugfs_regdump_show(struct seq_file *m, void *d)
170{
171 struct mhi_controller *mhi_cntrl = m->private;
172 enum mhi_state state;
173 enum mhi_ee_type ee;
174 int i, ret = -EIO;
175 u32 val;
176 void __iomem *mhi_base = mhi_cntrl->regs;
177 void __iomem *bhi_base = mhi_cntrl->bhi;
178 void __iomem *bhie_base = mhi_cntrl->bhie;
179 void __iomem *wake_db = mhi_cntrl->wake_db;
180 struct {
181 const char *name;
182 int offset;
183 void __iomem *base;
184 } regs[] = {
185 { "MHI_REGLEN", MHIREGLEN, mhi_base},
186 { "MHI_VER", MHIVER, mhi_base},
187 { "MHI_CFG", MHICFG, mhi_base},
188 { "MHI_CTRL", MHICTRL, mhi_base},
189 { "MHI_STATUS", MHISTATUS, mhi_base},
190 { "MHI_WAKE_DB", 0, wake_db},
191 { "BHI_EXECENV", BHI_EXECENV, bhi_base},
192 { "BHI_STATUS", BHI_STATUS, bhi_base},
193 { "BHI_ERRCODE", BHI_ERRCODE, bhi_base},
194 { "BHI_ERRDBG1", BHI_ERRDBG1, bhi_base},
195 { "BHI_ERRDBG2", BHI_ERRDBG2, bhi_base},
196 { "BHI_ERRDBG3", BHI_ERRDBG3, bhi_base},
197 { "BHIE_TXVEC_DB", BHIE_TXVECDB_OFFS, bhie_base},
198 { "BHIE_TXVEC_STATUS", BHIE_TXVECSTATUS_OFFS, bhie_base},
199 { "BHIE_RXVEC_DB", BHIE_RXVECDB_OFFS, bhie_base},
200 { "BHIE_RXVEC_STATUS", BHIE_RXVECSTATUS_OFFS, bhie_base},
201 { NULL },
202 };
203
204 if (!MHI_REG_ACCESS_VALID(mhi_cntrl->pm_state))
205 return ret;
206
207 seq_printf(m, "Host PM state: %s Device state: %s EE: %s\n",
208 to_mhi_pm_state_str(mhi_cntrl->pm_state),
209 TO_MHI_STATE_STR(mhi_cntrl->dev_state),
210 TO_MHI_EXEC_STR(mhi_cntrl->ee));
211
212 state = mhi_get_mhi_state(mhi_cntrl);
213 ee = mhi_get_exec_env(mhi_cntrl);
214 seq_printf(m, "Device EE: %s state: %s\n", TO_MHI_EXEC_STR(ee),
215 TO_MHI_STATE_STR(state));
216
217 for (i = 0; regs[i].name; i++) {
218 if (!regs[i].base)
219 continue;
220 ret = mhi_read_reg(mhi_cntrl, regs[i].base, regs[i].offset,
221 &val);
222 if (ret)
223 continue;
224
225 seq_printf(m, "%s: 0x%x\n", regs[i].name, val);
226 }
227
228 return 0;
229}
230
231static int mhi_debugfs_device_wake_show(struct seq_file *m, void *d)
232{
233 struct mhi_controller *mhi_cntrl = m->private;
234 struct mhi_device *mhi_dev = mhi_cntrl->mhi_dev;
235
236 if (!mhi_is_active(mhi_cntrl)) {
237 seq_puts(m, "Device not ready\n");
238 return -ENODEV;
239 }
240
241 seq_printf(m,
242 "Wake count: %d\n%s\n", mhi_dev->dev_wake,
243 "Usage: echo get/put > device_wake to vote/unvote for M0");
244
245 return 0;
246}
247
248static ssize_t mhi_debugfs_device_wake_write(struct file *file,
249 const char __user *ubuf,
250 size_t count, loff_t *ppos)
251{
252 struct seq_file *m = file->private_data;
253 struct mhi_controller *mhi_cntrl = m->private;
254 struct mhi_device *mhi_dev = mhi_cntrl->mhi_dev;
255 char buf[16];
256 int ret = -EINVAL;
257
258 if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
259 return -EFAULT;
260
261 if (!strncmp(buf, "get", 3)) {
262 ret = mhi_device_get_sync(mhi_dev);
263 } else if (!strncmp(buf, "put", 3)) {
264 mhi_device_put(mhi_dev);
265 ret = 0;
266 }
267
268 return ret ? ret : count;
269}
270
271static int mhi_debugfs_timeout_ms_show(struct seq_file *m, void *d)
272{
273 struct mhi_controller *mhi_cntrl = m->private;
274
275 seq_printf(m, "%u ms\n", mhi_cntrl->timeout_ms);
276
277 return 0;
278}
279
280static ssize_t mhi_debugfs_timeout_ms_write(struct file *file,
281 const char __user *ubuf,
282 size_t count, loff_t *ppos)
283{
284 struct seq_file *m = file->private_data;
285 struct mhi_controller *mhi_cntrl = m->private;
286 u32 timeout_ms;
287
288 if (kstrtou32_from_user(ubuf, count, 0, &timeout_ms))
289 return -EINVAL;
290
291 mhi_cntrl->timeout_ms = timeout_ms;
292
293 return count;
294}
295
296static int mhi_debugfs_states_open(struct inode *inode, struct file *fp)
297{
298 return single_open(fp, mhi_debugfs_states_show, inode->i_private);
299}
300
301static int mhi_debugfs_events_open(struct inode *inode, struct file *fp)
302{
303 return single_open(fp, mhi_debugfs_events_show, inode->i_private);
304}
305
306static int mhi_debugfs_channels_open(struct inode *inode, struct file *fp)
307{
308 return single_open(fp, mhi_debugfs_channels_show, inode->i_private);
309}
310
311static int mhi_debugfs_devices_open(struct inode *inode, struct file *fp)
312{
313 return single_open(fp, mhi_debugfs_devices_show, inode->i_private);
314}
315
316static int mhi_debugfs_regdump_open(struct inode *inode, struct file *fp)
317{
318 return single_open(fp, mhi_debugfs_regdump_show, inode->i_private);
319}
320
321static int mhi_debugfs_device_wake_open(struct inode *inode, struct file *fp)
322{
323 return single_open(fp, mhi_debugfs_device_wake_show, inode->i_private);
324}
325
326static int mhi_debugfs_timeout_ms_open(struct inode *inode, struct file *fp)
327{
328 return single_open(fp, mhi_debugfs_timeout_ms_show, inode->i_private);
329}
330
331static const struct file_operations debugfs_states_fops = {
332 .open = mhi_debugfs_states_open,
333 .release = single_release,
334 .read = seq_read,
335};
336
337static const struct file_operations debugfs_events_fops = {
338 .open = mhi_debugfs_events_open,
339 .release = single_release,
340 .read = seq_read,
341};
342
343static const struct file_operations debugfs_channels_fops = {
344 .open = mhi_debugfs_channels_open,
345 .release = single_release,
346 .read = seq_read,
347};
348
349static const struct file_operations debugfs_devices_fops = {
350 .open = mhi_debugfs_devices_open,
351 .release = single_release,
352 .read = seq_read,
353};
354
355static const struct file_operations debugfs_regdump_fops = {
356 .open = mhi_debugfs_regdump_open,
357 .release = single_release,
358 .read = seq_read,
359};
360
361static const struct file_operations debugfs_device_wake_fops = {
362 .open = mhi_debugfs_device_wake_open,
363 .write = mhi_debugfs_device_wake_write,
364 .release = single_release,
365 .read = seq_read,
366};
367
368static const struct file_operations debugfs_timeout_ms_fops = {
369 .open = mhi_debugfs_timeout_ms_open,
370 .write = mhi_debugfs_timeout_ms_write,
371 .release = single_release,
372 .read = seq_read,
373};
374
375static struct dentry *mhi_debugfs_root;
376
377void mhi_create_debugfs(struct mhi_controller *mhi_cntrl)
378{
379 mhi_cntrl->debugfs_dentry =
380 debugfs_create_dir(dev_name(&mhi_cntrl->mhi_dev->dev),
381 mhi_debugfs_root);
382
383 debugfs_create_file("states", 0444, mhi_cntrl->debugfs_dentry,
384 mhi_cntrl, &debugfs_states_fops);
385 debugfs_create_file("events", 0444, mhi_cntrl->debugfs_dentry,
386 mhi_cntrl, &debugfs_events_fops);
387 debugfs_create_file("channels", 0444, mhi_cntrl->debugfs_dentry,
388 mhi_cntrl, &debugfs_channels_fops);
389 debugfs_create_file("devices", 0444, mhi_cntrl->debugfs_dentry,
390 mhi_cntrl, &debugfs_devices_fops);
391 debugfs_create_file("regdump", 0444, mhi_cntrl->debugfs_dentry,
392 mhi_cntrl, &debugfs_regdump_fops);
393 debugfs_create_file("device_wake", 0644, mhi_cntrl->debugfs_dentry,
394 mhi_cntrl, &debugfs_device_wake_fops);
395 debugfs_create_file("timeout_ms", 0644, mhi_cntrl->debugfs_dentry,
396 mhi_cntrl, &debugfs_timeout_ms_fops);
397}
398
399void mhi_destroy_debugfs(struct mhi_controller *mhi_cntrl)
400{
401 debugfs_remove_recursive(mhi_cntrl->debugfs_dentry);
402 mhi_cntrl->debugfs_dentry = NULL;
403}
404
405void mhi_debugfs_init(void)
406{
407 mhi_debugfs_root = debugfs_create_dir(mhi_bus_type.name, NULL);
408}
409
410void mhi_debugfs_exit(void)
411{
412 debugfs_remove_recursive(mhi_debugfs_root);
413}
414
