1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * UHCI-specific debugging code. Invaluable when something |
4 | * goes wrong, but don't get in my face. |
5 | * |
6 | * Kernel visible pointers are surrounded in []s and bus |
7 | * visible pointers are surrounded in ()s |
8 | * |
9 | * (C) Copyright 1999 Linus Torvalds |
10 | * (C) Copyright 1999-2001 Johannes Erdfelt |
11 | */ |
12 | |
13 | #include <linux/slab.h> |
14 | #include <linux/kernel.h> |
15 | #include <linux/debugfs.h> |
16 | #include <asm/io.h> |
17 | |
18 | #include "uhci-hcd.h" |
19 | |
20 | #define 1024 |
21 | |
22 | static struct dentry *uhci_debugfs_root; |
23 | |
24 | #ifdef CONFIG_DYNAMIC_DEBUG |
25 | |
26 | /* Handle REALLY large printks so we don't overflow buffers */ |
27 | static void lprintk(char *buf) |
28 | { |
29 | char *p; |
30 | |
31 | /* Just write one line at a time */ |
32 | while (buf) { |
33 | p = strchr(buf, '\n'); |
34 | if (p) |
35 | *p = 0; |
36 | printk(KERN_DEBUG "%s\n" , buf); |
37 | buf = p; |
38 | if (buf) |
39 | buf++; |
40 | } |
41 | } |
42 | |
43 | static int uhci_show_td(struct uhci_hcd *uhci, struct uhci_td *td, char *buf, |
44 | int len, int space) |
45 | { |
46 | char *out = buf; |
47 | char *spid; |
48 | u32 status, token; |
49 | |
50 | status = td_status(uhci, td); |
51 | out += sprintf(buf: out, fmt: "%*s[%p] link (%08x) " , space, "" , td, |
52 | hc32_to_cpu(uhci, x: td->link)); |
53 | out += sprintf(buf: out, fmt: "e%d %s%s%s%s%s%s%s%s%s%sLength=%x " , |
54 | ((status >> 27) & 3), |
55 | (status & TD_CTRL_SPD) ? "SPD " : "" , |
56 | (status & TD_CTRL_LS) ? "LS " : "" , |
57 | (status & TD_CTRL_IOC) ? "IOC " : "" , |
58 | (status & TD_CTRL_ACTIVE) ? "Active " : "" , |
59 | (status & TD_CTRL_STALLED) ? "Stalled " : "" , |
60 | (status & TD_CTRL_DBUFERR) ? "DataBufErr " : "" , |
61 | (status & TD_CTRL_BABBLE) ? "Babble " : "" , |
62 | (status & TD_CTRL_NAK) ? "NAK " : "" , |
63 | (status & TD_CTRL_CRCTIMEO) ? "CRC/Timeo " : "" , |
64 | (status & TD_CTRL_BITSTUFF) ? "BitStuff " : "" , |
65 | status & 0x7ff); |
66 | if (out - buf > len) |
67 | goto done; |
68 | |
69 | token = td_token(uhci, td); |
70 | switch (uhci_packetid(token)) { |
71 | case USB_PID_SETUP: |
72 | spid = "SETUP" ; |
73 | break; |
74 | case USB_PID_OUT: |
75 | spid = "OUT" ; |
76 | break; |
77 | case USB_PID_IN: |
78 | spid = "IN" ; |
79 | break; |
80 | default: |
81 | spid = "?" ; |
82 | break; |
83 | } |
84 | |
85 | out += sprintf(buf: out, fmt: "MaxLen=%x DT%d EndPt=%x Dev=%x, PID=%x(%s) " , |
86 | token >> 21, |
87 | ((token >> 19) & 1), |
88 | (token >> 15) & 15, |
89 | (token >> 8) & 127, |
90 | (token & 0xff), |
91 | spid); |
92 | out += sprintf(buf: out, fmt: "(buf=%08x)\n" , hc32_to_cpu(uhci, x: td->buffer)); |
93 | |
94 | done: |
95 | if (out - buf > len) |
96 | out += sprintf(buf: out, fmt: " ...\n" ); |
97 | return out - buf; |
98 | } |
99 | |
100 | static int uhci_show_urbp(struct uhci_hcd *uhci, struct urb_priv *urbp, |
101 | char *buf, int len, int space) |
102 | { |
103 | char *out = buf; |
104 | struct uhci_td *td; |
105 | int i, nactive, ninactive; |
106 | char *ptype; |
107 | |
108 | |
109 | out += sprintf(buf: out, fmt: "urb_priv [%p] " , urbp); |
110 | out += sprintf(buf: out, fmt: "urb [%p] " , urbp->urb); |
111 | out += sprintf(buf: out, fmt: "qh [%p] " , urbp->qh); |
112 | out += sprintf(buf: out, fmt: "Dev=%d " , usb_pipedevice(urbp->urb->pipe)); |
113 | out += sprintf(buf: out, fmt: "EP=%x(%s) " , usb_pipeendpoint(urbp->urb->pipe), |
114 | (usb_pipein(urbp->urb->pipe) ? "IN" : "OUT" )); |
115 | if (out - buf > len) |
116 | goto done; |
117 | |
118 | switch (usb_pipetype(urbp->urb->pipe)) { |
119 | case PIPE_ISOCHRONOUS: ptype = "ISO" ; break; |
120 | case PIPE_INTERRUPT: ptype = "INT" ; break; |
121 | case PIPE_BULK: ptype = "BLK" ; break; |
122 | default: |
123 | case PIPE_CONTROL: ptype = "CTL" ; break; |
124 | } |
125 | |
126 | out += sprintf(buf: out, fmt: "%s%s" , ptype, (urbp->fsbr ? " FSBR" : "" )); |
127 | out += sprintf(buf: out, fmt: " Actlen=%d%s" , urbp->urb->actual_length, |
128 | (urbp->qh->type == USB_ENDPOINT_XFER_CONTROL ? |
129 | "-8" : "" )); |
130 | |
131 | if (urbp->urb->unlinked) |
132 | out += sprintf(buf: out, fmt: " Unlinked=%d" , urbp->urb->unlinked); |
133 | out += sprintf(buf: out, fmt: "\n" ); |
134 | |
135 | if (out - buf > len) |
136 | goto done; |
137 | |
138 | i = nactive = ninactive = 0; |
139 | list_for_each_entry(td, &urbp->td_list, list) { |
140 | if (urbp->qh->type != USB_ENDPOINT_XFER_ISOC && |
141 | (++i <= 10 || debug > 2)) { |
142 | out += sprintf(buf: out, fmt: "%*s%d: " , space + 2, "" , i); |
143 | out += uhci_show_td(uhci, td, buf: out, |
144 | len: len - (out - buf), space: 0); |
145 | if (out - buf > len) |
146 | goto tail; |
147 | } else { |
148 | if (td_status(uhci, td) & TD_CTRL_ACTIVE) |
149 | ++nactive; |
150 | else |
151 | ++ninactive; |
152 | } |
153 | } |
154 | if (nactive + ninactive > 0) |
155 | out += sprintf(buf: out, |
156 | fmt: "%*s[skipped %d inactive and %d active TDs]\n" , |
157 | space, "" , ninactive, nactive); |
158 | done: |
159 | if (out - buf > len) |
160 | out += sprintf(buf: out, fmt: " ...\n" ); |
161 | tail: |
162 | return out - buf; |
163 | } |
164 | |
165 | static int uhci_show_qh(struct uhci_hcd *uhci, |
166 | struct uhci_qh *qh, char *buf, int len, int space) |
167 | { |
168 | char *out = buf; |
169 | int i, nurbs; |
170 | __hc32 element = qh_element(qh); |
171 | char *qtype; |
172 | |
173 | switch (qh->type) { |
174 | case USB_ENDPOINT_XFER_ISOC: qtype = "ISO" ; break; |
175 | case USB_ENDPOINT_XFER_INT: qtype = "INT" ; break; |
176 | case USB_ENDPOINT_XFER_BULK: qtype = "BLK" ; break; |
177 | case USB_ENDPOINT_XFER_CONTROL: qtype = "CTL" ; break; |
178 | default: qtype = "Skel" ; break; |
179 | } |
180 | |
181 | out += sprintf(buf: out, fmt: "%*s[%p] %s QH link (%08x) element (%08x)\n" , |
182 | space, "" , qh, qtype, |
183 | hc32_to_cpu(uhci, x: qh->link), |
184 | hc32_to_cpu(uhci, x: element)); |
185 | if (qh->type == USB_ENDPOINT_XFER_ISOC) |
186 | out += sprintf(buf: out, |
187 | fmt: "%*s period %d phase %d load %d us, frame %x desc [%p]\n" , |
188 | space, "" , qh->period, qh->phase, qh->load, |
189 | qh->iso_frame, qh->iso_packet_desc); |
190 | else if (qh->type == USB_ENDPOINT_XFER_INT) |
191 | out += sprintf(buf: out, fmt: "%*s period %d phase %d load %d us\n" , |
192 | space, "" , qh->period, qh->phase, qh->load); |
193 | if (out - buf > len) |
194 | goto done; |
195 | |
196 | if (element & UHCI_PTR_QH(uhci)) |
197 | out += sprintf(buf: out, fmt: "%*s Element points to QH (bug?)\n" , space, "" ); |
198 | |
199 | if (element & UHCI_PTR_DEPTH(uhci)) |
200 | out += sprintf(buf: out, fmt: "%*s Depth traverse\n" , space, "" ); |
201 | |
202 | if (element & cpu_to_hc32(uhci, x: 8)) |
203 | out += sprintf(buf: out, fmt: "%*s Bit 3 set (bug?)\n" , space, "" ); |
204 | |
205 | if (!(element & ~(UHCI_PTR_QH(uhci) | UHCI_PTR_DEPTH(uhci)))) |
206 | out += sprintf(buf: out, fmt: "%*s Element is NULL (bug?)\n" , space, "" ); |
207 | |
208 | if (out - buf > len) |
209 | goto done; |
210 | |
211 | if (list_empty(head: &qh->queue)) { |
212 | out += sprintf(buf: out, fmt: "%*s queue is empty\n" , space, "" ); |
213 | if (qh == uhci->skel_async_qh) { |
214 | out += uhci_show_td(uhci, td: uhci->term_td, buf: out, |
215 | len: len - (out - buf), space: 0); |
216 | if (out - buf > len) |
217 | goto tail; |
218 | } |
219 | } else { |
220 | struct urb_priv *urbp = list_entry(qh->queue.next, |
221 | struct urb_priv, node); |
222 | struct uhci_td *td = list_entry(urbp->td_list.next, |
223 | struct uhci_td, list); |
224 | |
225 | if (element != LINK_TO_TD(uhci, td)) |
226 | out += sprintf(buf: out, fmt: "%*s Element != First TD\n" , |
227 | space, "" ); |
228 | i = nurbs = 0; |
229 | list_for_each_entry(urbp, &qh->queue, node) { |
230 | if (++i <= 10) { |
231 | out += uhci_show_urbp(uhci, urbp, buf: out, |
232 | len: len - (out - buf), space: space + 2); |
233 | if (out - buf > len) |
234 | goto tail; |
235 | } |
236 | else |
237 | ++nurbs; |
238 | } |
239 | if (nurbs > 0) |
240 | out += sprintf(buf: out, fmt: "%*s Skipped %d URBs\n" , |
241 | space, "" , nurbs); |
242 | } |
243 | |
244 | if (out - buf > len) |
245 | goto done; |
246 | |
247 | if (qh->dummy_td) { |
248 | out += sprintf(buf: out, fmt: "%*s Dummy TD\n" , space, "" ); |
249 | out += uhci_show_td(uhci, td: qh->dummy_td, buf: out, |
250 | len: len - (out - buf), space: 0); |
251 | if (out - buf > len) |
252 | goto tail; |
253 | } |
254 | |
255 | done: |
256 | if (out - buf > len) |
257 | out += sprintf(buf: out, fmt: " ...\n" ); |
258 | tail: |
259 | return out - buf; |
260 | } |
261 | |
262 | static int uhci_show_sc(int port, unsigned short status, char *buf) |
263 | { |
264 | return sprintf(buf, fmt: " stat%d = %04x %s%s%s%s%s%s%s%s%s%s\n" , |
265 | port, |
266 | status, |
267 | (status & USBPORTSC_SUSP) ? " Suspend" : "" , |
268 | (status & USBPORTSC_OCC) ? " OverCurrentChange" : "" , |
269 | (status & USBPORTSC_OC) ? " OverCurrent" : "" , |
270 | (status & USBPORTSC_PR) ? " Reset" : "" , |
271 | (status & USBPORTSC_LSDA) ? " LowSpeed" : "" , |
272 | (status & USBPORTSC_RD) ? " ResumeDetect" : "" , |
273 | (status & USBPORTSC_PEC) ? " EnableChange" : "" , |
274 | (status & USBPORTSC_PE) ? " Enabled" : "" , |
275 | (status & USBPORTSC_CSC) ? " ConnectChange" : "" , |
276 | (status & USBPORTSC_CCS) ? " Connected" : "" ); |
277 | } |
278 | |
279 | static int uhci_show_root_hub_state(struct uhci_hcd *uhci, char *buf) |
280 | { |
281 | char *rh_state; |
282 | |
283 | switch (uhci->rh_state) { |
284 | case UHCI_RH_RESET: |
285 | rh_state = "reset" ; break; |
286 | case UHCI_RH_SUSPENDED: |
287 | rh_state = "suspended" ; break; |
288 | case UHCI_RH_AUTO_STOPPED: |
289 | rh_state = "auto-stopped" ; break; |
290 | case UHCI_RH_RESUMING: |
291 | rh_state = "resuming" ; break; |
292 | case UHCI_RH_SUSPENDING: |
293 | rh_state = "suspending" ; break; |
294 | case UHCI_RH_RUNNING: |
295 | rh_state = "running" ; break; |
296 | case UHCI_RH_RUNNING_NODEVS: |
297 | rh_state = "running, no devs" ; break; |
298 | default: |
299 | rh_state = "?" ; break; |
300 | } |
301 | return sprintf(buf, fmt: "Root-hub state: %s FSBR: %d\n" , |
302 | rh_state, uhci->fsbr_is_on); |
303 | } |
304 | |
305 | static int uhci_show_status(struct uhci_hcd *uhci, char *buf, int len) |
306 | { |
307 | char *out = buf; |
308 | unsigned short usbcmd, usbstat, usbint, usbfrnum; |
309 | unsigned int flbaseadd; |
310 | unsigned char sof; |
311 | unsigned short portsc1, portsc2; |
312 | |
313 | |
314 | usbcmd = uhci_readw(uhci, USBCMD); |
315 | usbstat = uhci_readw(uhci, USBSTS); |
316 | usbint = uhci_readw(uhci, USBINTR); |
317 | usbfrnum = uhci_readw(uhci, USBFRNUM); |
318 | flbaseadd = uhci_readl(uhci, USBFLBASEADD); |
319 | sof = uhci_readb(uhci, USBSOF); |
320 | portsc1 = uhci_readw(uhci, USBPORTSC1); |
321 | portsc2 = uhci_readw(uhci, USBPORTSC2); |
322 | |
323 | out += sprintf(buf: out, fmt: " usbcmd = %04x %s%s%s%s%s%s%s%s\n" , |
324 | usbcmd, |
325 | (usbcmd & USBCMD_MAXP) ? "Maxp64 " : "Maxp32 " , |
326 | (usbcmd & USBCMD_CF) ? "CF " : "" , |
327 | (usbcmd & USBCMD_SWDBG) ? "SWDBG " : "" , |
328 | (usbcmd & USBCMD_FGR) ? "FGR " : "" , |
329 | (usbcmd & USBCMD_EGSM) ? "EGSM " : "" , |
330 | (usbcmd & USBCMD_GRESET) ? "GRESET " : "" , |
331 | (usbcmd & USBCMD_HCRESET) ? "HCRESET " : "" , |
332 | (usbcmd & USBCMD_RS) ? "RS " : "" ); |
333 | if (out - buf > len) |
334 | goto done; |
335 | |
336 | out += sprintf(buf: out, fmt: " usbstat = %04x %s%s%s%s%s%s\n" , |
337 | usbstat, |
338 | (usbstat & USBSTS_HCH) ? "HCHalted " : "" , |
339 | (usbstat & USBSTS_HCPE) ? "HostControllerProcessError " : "" , |
340 | (usbstat & USBSTS_HSE) ? "HostSystemError " : "" , |
341 | (usbstat & USBSTS_RD) ? "ResumeDetect " : "" , |
342 | (usbstat & USBSTS_ERROR) ? "USBError " : "" , |
343 | (usbstat & USBSTS_USBINT) ? "USBINT " : "" ); |
344 | if (out - buf > len) |
345 | goto done; |
346 | |
347 | out += sprintf(buf: out, fmt: " usbint = %04x\n" , usbint); |
348 | out += sprintf(buf: out, fmt: " usbfrnum = (%d)%03x\n" , (usbfrnum >> 10) & 1, |
349 | 0xfff & (4*(unsigned int)usbfrnum)); |
350 | out += sprintf(buf: out, fmt: " flbaseadd = %08x\n" , flbaseadd); |
351 | out += sprintf(buf: out, fmt: " sof = %02x\n" , sof); |
352 | if (out - buf > len) |
353 | goto done; |
354 | |
355 | out += uhci_show_sc(port: 1, status: portsc1, buf: out); |
356 | if (out - buf > len) |
357 | goto done; |
358 | |
359 | out += uhci_show_sc(port: 2, status: portsc2, buf: out); |
360 | if (out - buf > len) |
361 | goto done; |
362 | |
363 | out += sprintf(buf: out, |
364 | fmt: "Most recent frame: %x (%d) Last ISO frame: %x (%d)\n" , |
365 | uhci->frame_number, uhci->frame_number & 1023, |
366 | uhci->last_iso_frame, uhci->last_iso_frame & 1023); |
367 | |
368 | done: |
369 | if (out - buf > len) |
370 | out += sprintf(buf: out, fmt: " ...\n" ); |
371 | return out - buf; |
372 | } |
373 | |
374 | static int uhci_sprint_schedule(struct uhci_hcd *uhci, char *buf, int len) |
375 | { |
376 | char *out = buf; |
377 | int i, j; |
378 | struct uhci_qh *qh; |
379 | struct uhci_td *td; |
380 | struct list_head *tmp, *head; |
381 | int nframes, nerrs; |
382 | __hc32 link; |
383 | __hc32 fsbr_link; |
384 | |
385 | static const char * const qh_names[] = { |
386 | "unlink" , "iso" , "int128" , "int64" , "int32" , "int16" , |
387 | "int8" , "int4" , "int2" , "async" , "term" |
388 | }; |
389 | |
390 | out += uhci_show_root_hub_state(uhci, buf: out); |
391 | if (out - buf > len) |
392 | goto done; |
393 | out += sprintf(buf: out, fmt: "HC status\n" ); |
394 | out += uhci_show_status(uhci, buf: out, len: len - (out - buf)); |
395 | if (out - buf > len) |
396 | goto tail; |
397 | |
398 | out += sprintf(buf: out, fmt: "Periodic load table\n" ); |
399 | for (i = 0; i < MAX_PHASE; ++i) { |
400 | out += sprintf(buf: out, fmt: "\t%d" , uhci->load[i]); |
401 | if (i % 8 == 7) |
402 | *out++ = '\n'; |
403 | } |
404 | out += sprintf(buf: out, fmt: "Total: %d, #INT: %d, #ISO: %d\n" , |
405 | uhci->total_load, |
406 | uhci_to_hcd(uhci)->self.bandwidth_int_reqs, |
407 | uhci_to_hcd(uhci)->self.bandwidth_isoc_reqs); |
408 | if (debug <= 1) |
409 | goto tail; |
410 | |
411 | out += sprintf(buf: out, fmt: "Frame List\n" ); |
412 | nframes = 10; |
413 | nerrs = 0; |
414 | for (i = 0; i < UHCI_NUMFRAMES; ++i) { |
415 | __hc32 qh_dma; |
416 | |
417 | if (out - buf > len) |
418 | goto done; |
419 | j = 0; |
420 | td = uhci->frame_cpu[i]; |
421 | link = uhci->frame[i]; |
422 | if (!td) |
423 | goto check_link; |
424 | |
425 | if (nframes > 0) { |
426 | out += sprintf(buf: out, fmt: "- Frame %d -> (%08x)\n" , |
427 | i, hc32_to_cpu(uhci, x: link)); |
428 | j = 1; |
429 | } |
430 | |
431 | head = &td->fl_list; |
432 | tmp = head; |
433 | do { |
434 | td = list_entry(tmp, struct uhci_td, fl_list); |
435 | tmp = tmp->next; |
436 | if (link != LINK_TO_TD(uhci, td)) { |
437 | if (nframes > 0) { |
438 | out += sprintf(buf: out, |
439 | fmt: " link does not match list entry!\n" ); |
440 | if (out - buf > len) |
441 | goto done; |
442 | } else |
443 | ++nerrs; |
444 | } |
445 | if (nframes > 0) { |
446 | out += uhci_show_td(uhci, td, buf: out, |
447 | len: len - (out - buf), space: 4); |
448 | if (out - buf > len) |
449 | goto tail; |
450 | } |
451 | link = td->link; |
452 | } while (tmp != head); |
453 | |
454 | check_link: |
455 | qh_dma = uhci_frame_skel_link(uhci, i); |
456 | if (link != qh_dma) { |
457 | if (nframes > 0) { |
458 | if (!j) { |
459 | out += sprintf(buf: out, |
460 | fmt: "- Frame %d -> (%08x)\n" , |
461 | i, hc32_to_cpu(uhci, x: link)); |
462 | j = 1; |
463 | } |
464 | out += sprintf(buf: out, |
465 | fmt: " link does not match QH (%08x)!\n" , |
466 | hc32_to_cpu(uhci, x: qh_dma)); |
467 | if (out - buf > len) |
468 | goto done; |
469 | } else |
470 | ++nerrs; |
471 | } |
472 | nframes -= j; |
473 | } |
474 | if (nerrs > 0) |
475 | out += sprintf(buf: out, fmt: "Skipped %d bad links\n" , nerrs); |
476 | |
477 | out += sprintf(buf: out, fmt: "Skeleton QHs\n" ); |
478 | |
479 | if (out - buf > len) |
480 | goto done; |
481 | |
482 | fsbr_link = 0; |
483 | for (i = 0; i < UHCI_NUM_SKELQH; ++i) { |
484 | int cnt = 0; |
485 | |
486 | qh = uhci->skelqh[i]; |
487 | out += sprintf(buf: out, fmt: "- skel_%s_qh\n" , qh_names[i]); |
488 | out += uhci_show_qh(uhci, qh, buf: out, len: len - (out - buf), space: 4); |
489 | if (out - buf > len) |
490 | goto tail; |
491 | |
492 | /* Last QH is the Terminating QH, it's different */ |
493 | if (i == SKEL_TERM) { |
494 | if (qh_element(qh) != LINK_TO_TD(uhci, uhci->term_td)) { |
495 | out += sprintf(buf: out, |
496 | fmt: " skel_term_qh element is not set to term_td!\n" ); |
497 | if (out - buf > len) |
498 | goto done; |
499 | } |
500 | link = fsbr_link; |
501 | if (!link) |
502 | link = LINK_TO_QH(uhci, uhci->skel_term_qh); |
503 | goto check_qh_link; |
504 | } |
505 | |
506 | head = &qh->node; |
507 | tmp = head->next; |
508 | |
509 | while (tmp != head) { |
510 | qh = list_entry(tmp, struct uhci_qh, node); |
511 | tmp = tmp->next; |
512 | if (++cnt <= 10) { |
513 | out += uhci_show_qh(uhci, qh, buf: out, |
514 | len: len - (out - buf), space: 4); |
515 | if (out - buf > len) |
516 | goto tail; |
517 | } |
518 | if (!fsbr_link && qh->skel >= SKEL_FSBR) |
519 | fsbr_link = LINK_TO_QH(uhci, qh); |
520 | } |
521 | if ((cnt -= 10) > 0) |
522 | out += sprintf(buf: out, fmt: " Skipped %d QHs\n" , cnt); |
523 | |
524 | link = UHCI_PTR_TERM(uhci); |
525 | if (i <= SKEL_ISO) |
526 | ; |
527 | else if (i < SKEL_ASYNC) |
528 | link = LINK_TO_QH(uhci, uhci->skel_async_qh); |
529 | else if (!uhci->fsbr_is_on) |
530 | ; |
531 | else |
532 | link = LINK_TO_QH(uhci, uhci->skel_term_qh); |
533 | check_qh_link: |
534 | if (qh->link != link) |
535 | out += sprintf(buf: out, |
536 | fmt: " last QH not linked to next skeleton!\n" ); |
537 | |
538 | if (out - buf > len) |
539 | goto done; |
540 | } |
541 | |
542 | done: |
543 | if (out - buf > len) |
544 | out += sprintf(buf: out, fmt: " ...\n" ); |
545 | tail: |
546 | return out - buf; |
547 | } |
548 | |
549 | #ifdef CONFIG_DEBUG_FS |
550 | |
551 | #define MAX_OUTPUT (64 * 1024) |
552 | |
553 | struct uhci_debug { |
554 | int size; |
555 | char *data; |
556 | }; |
557 | |
558 | static int uhci_debug_open(struct inode *inode, struct file *file) |
559 | { |
560 | struct uhci_hcd *uhci = inode->i_private; |
561 | struct uhci_debug *up; |
562 | unsigned long flags; |
563 | |
564 | up = kmalloc(size: sizeof(*up), GFP_KERNEL); |
565 | if (!up) |
566 | return -ENOMEM; |
567 | |
568 | up->data = kmalloc(MAX_OUTPUT, GFP_KERNEL); |
569 | if (!up->data) { |
570 | kfree(objp: up); |
571 | return -ENOMEM; |
572 | } |
573 | |
574 | up->size = 0; |
575 | spin_lock_irqsave(&uhci->lock, flags); |
576 | if (uhci->is_initialized) |
577 | up->size = uhci_sprint_schedule(uhci, buf: up->data, |
578 | MAX_OUTPUT - EXTRA_SPACE); |
579 | spin_unlock_irqrestore(lock: &uhci->lock, flags); |
580 | |
581 | file->private_data = up; |
582 | |
583 | return 0; |
584 | } |
585 | |
586 | static loff_t uhci_debug_lseek(struct file *file, loff_t off, int whence) |
587 | { |
588 | struct uhci_debug *up = file->private_data; |
589 | return no_seek_end_llseek_size(file, off, whence, up->size); |
590 | } |
591 | |
592 | static ssize_t uhci_debug_read(struct file *file, char __user *buf, |
593 | size_t nbytes, loff_t *ppos) |
594 | { |
595 | struct uhci_debug *up = file->private_data; |
596 | return simple_read_from_buffer(to: buf, count: nbytes, ppos, from: up->data, available: up->size); |
597 | } |
598 | |
599 | static int uhci_debug_release(struct inode *inode, struct file *file) |
600 | { |
601 | struct uhci_debug *up = file->private_data; |
602 | |
603 | kfree(objp: up->data); |
604 | kfree(objp: up); |
605 | |
606 | return 0; |
607 | } |
608 | |
609 | static const struct file_operations uhci_debug_operations = { |
610 | .owner = THIS_MODULE, |
611 | .open = uhci_debug_open, |
612 | .llseek = uhci_debug_lseek, |
613 | .read = uhci_debug_read, |
614 | .release = uhci_debug_release, |
615 | }; |
616 | #define UHCI_DEBUG_OPS |
617 | |
618 | #endif /* CONFIG_DEBUG_FS */ |
619 | |
620 | #else /* CONFIG_DYNAMIC_DEBUG*/ |
621 | |
622 | static inline void lprintk(char *buf) |
623 | {} |
624 | |
625 | static inline int uhci_show_qh(struct uhci_hcd *uhci, |
626 | struct uhci_qh *qh, char *buf, int len, int space) |
627 | { |
628 | return 0; |
629 | } |
630 | |
631 | static inline int uhci_sprint_schedule(struct uhci_hcd *uhci, |
632 | char *buf, int len) |
633 | { |
634 | return 0; |
635 | } |
636 | |
637 | #endif |
638 | |