Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * UHCI-specific debugging code. Invaluable when something | |
3 | * goes wrong, but don't get in my face. | |
4 | * | |
687f5f34 AS |
5 | * Kernel visible pointers are surrounded in []s and bus |
6 | * visible pointers are surrounded in ()s | |
1da177e4 LT |
7 | * |
8 | * (C) Copyright 1999 Linus Torvalds | |
9 | * (C) Copyright 1999-2001 Johannes Erdfelt | |
10 | */ | |
11 | ||
1da177e4 LT |
12 | #include <linux/kernel.h> |
13 | #include <linux/debugfs.h> | |
14 | #include <linux/smp_lock.h> | |
15 | #include <asm/io.h> | |
16 | ||
17 | #include "uhci-hcd.h" | |
18 | ||
066202dd | 19 | #define uhci_debug_operations (* (const struct file_operations *) NULL) |
8d402e1a AS |
20 | static struct dentry *uhci_debugfs_root; |
21 | ||
22 | #ifdef DEBUG | |
1da177e4 | 23 | |
687f5f34 | 24 | /* Handle REALLY large printks so we don't overflow buffers */ |
8d402e1a | 25 | static void lprintk(char *buf) |
1da177e4 LT |
26 | { |
27 | char *p; | |
28 | ||
29 | /* Just write one line at a time */ | |
30 | while (buf) { | |
31 | p = strchr(buf, '\n'); | |
32 | if (p) | |
33 | *p = 0; | |
34 | printk(KERN_DEBUG "%s\n", buf); | |
35 | buf = p; | |
36 | if (buf) | |
37 | buf++; | |
38 | } | |
39 | } | |
40 | ||
41 | static int uhci_show_td(struct uhci_td *td, char *buf, int len, int space) | |
42 | { | |
43 | char *out = buf; | |
44 | char *spid; | |
45 | u32 status, token; | |
46 | ||
47 | /* Try to make sure there's enough memory */ | |
48 | if (len < 160) | |
49 | return 0; | |
50 | ||
51 | status = td_status(td); | |
52 | out += sprintf(out, "%*s[%p] link (%08x) ", space, "", td, le32_to_cpu(td->link)); | |
53 | out += sprintf(out, "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 | ||
67 | token = td_token(td); | |
68 | switch (uhci_packetid(token)) { | |
69 | case USB_PID_SETUP: | |
70 | spid = "SETUP"; | |
71 | break; | |
72 | case USB_PID_OUT: | |
73 | spid = "OUT"; | |
74 | break; | |
75 | case USB_PID_IN: | |
76 | spid = "IN"; | |
77 | break; | |
78 | default: | |
79 | spid = "?"; | |
80 | break; | |
81 | } | |
82 | ||
83 | out += sprintf(out, "MaxLen=%x DT%d EndPt=%x Dev=%x, PID=%x(%s) ", | |
84 | token >> 21, | |
85 | ((token >> 19) & 1), | |
86 | (token >> 15) & 15, | |
87 | (token >> 8) & 127, | |
88 | (token & 0xff), | |
89 | spid); | |
90 | out += sprintf(out, "(buf=%08x)\n", le32_to_cpu(td->buffer)); | |
91 | ||
92 | return out - buf; | |
93 | } | |
94 | ||
dccf4a48 | 95 | static int uhci_show_urbp(struct urb_priv *urbp, char *buf, int len, int space) |
1da177e4 LT |
96 | { |
97 | char *out = buf; | |
1da177e4 | 98 | struct uhci_td *td; |
dccf4a48 | 99 | int i, nactive, ninactive; |
4de7d2c2 | 100 | char *ptype; |
dccf4a48 AS |
101 | |
102 | if (len < 200) | |
103 | return 0; | |
104 | ||
105 | out += sprintf(out, "urb_priv [%p] ", urbp); | |
106 | out += sprintf(out, "urb [%p] ", urbp->urb); | |
107 | out += sprintf(out, "qh [%p] ", urbp->qh); | |
108 | out += sprintf(out, "Dev=%d ", usb_pipedevice(urbp->urb->pipe)); | |
109 | out += sprintf(out, "EP=%x(%s) ", usb_pipeendpoint(urbp->urb->pipe), | |
110 | (usb_pipein(urbp->urb->pipe) ? "IN" : "OUT")); | |
111 | ||
112 | switch (usb_pipetype(urbp->urb->pipe)) { | |
4de7d2c2 AS |
113 | case PIPE_ISOCHRONOUS: ptype = "ISO"; break; |
114 | case PIPE_INTERRUPT: ptype = "INT"; break; | |
115 | case PIPE_BULK: ptype = "BLK"; break; | |
116 | default: | |
117 | case PIPE_CONTROL: ptype = "CTL"; break; | |
dccf4a48 AS |
118 | } |
119 | ||
4de7d2c2 | 120 | out += sprintf(out, "%s%s", ptype, (urbp->fsbr ? " FSBR" : "")); |
59e29ed9 | 121 | out += sprintf(out, " Actlen=%d", urbp->urb->actual_length); |
dccf4a48 AS |
122 | |
123 | if (urbp->urb->status != -EINPROGRESS) | |
124 | out += sprintf(out, " Status=%d", urbp->urb->status); | |
125 | out += sprintf(out, "\n"); | |
126 | ||
127 | i = nactive = ninactive = 0; | |
128 | list_for_each_entry(td, &urbp->td_list, list) { | |
c8155cc5 AS |
129 | if (urbp->qh->type != USB_ENDPOINT_XFER_ISOC && |
130 | (++i <= 10 || debug > 2)) { | |
dccf4a48 AS |
131 | out += sprintf(out, "%*s%d: ", space + 2, "", i); |
132 | out += uhci_show_td(td, out, len - (out - buf), 0); | |
133 | } else { | |
134 | if (td_status(td) & TD_CTRL_ACTIVE) | |
135 | ++nactive; | |
136 | else | |
137 | ++ninactive; | |
138 | } | |
139 | } | |
140 | if (nactive + ninactive > 0) | |
141 | out += sprintf(out, "%*s[skipped %d inactive and %d active " | |
142 | "TDs]\n", | |
143 | space, "", ninactive, nactive); | |
144 | ||
145 | return out - buf; | |
146 | } | |
147 | ||
148 | static int uhci_show_qh(struct uhci_qh *qh, char *buf, int len, int space) | |
149 | { | |
150 | char *out = buf; | |
151 | int i, nurbs; | |
1da177e4 | 152 | __le32 element = qh_element(qh); |
4de7d2c2 | 153 | char *qtype; |
1da177e4 LT |
154 | |
155 | /* Try to make sure there's enough memory */ | |
caf3827a | 156 | if (len < 80 * 7) |
1da177e4 LT |
157 | return 0; |
158 | ||
4de7d2c2 AS |
159 | switch (qh->type) { |
160 | case USB_ENDPOINT_XFER_ISOC: qtype = "ISO"; break; | |
161 | case USB_ENDPOINT_XFER_INT: qtype = "INT"; break; | |
162 | case USB_ENDPOINT_XFER_BULK: qtype = "BLK"; break; | |
163 | case USB_ENDPOINT_XFER_CONTROL: qtype = "CTL"; break; | |
164 | default: qtype = "Skel" ; break; | |
165 | } | |
166 | ||
167 | out += sprintf(out, "%*s[%p] %s QH link (%08x) element (%08x)\n", | |
168 | space, "", qh, qtype, | |
169 | le32_to_cpu(qh->link), le32_to_cpu(element)); | |
caf3827a | 170 | if (qh->type == USB_ENDPOINT_XFER_ISOC) |
3ca2a321 AS |
171 | out += sprintf(out, "%*s period %d phase %d load %d us, " |
172 | "frame %x desc [%p]\n", | |
173 | space, "", qh->period, qh->phase, qh->load, | |
174 | qh->iso_frame, qh->iso_packet_desc); | |
175 | else if (qh->type == USB_ENDPOINT_XFER_INT) | |
176 | out += sprintf(out, "%*s period %d phase %d load %d us\n", | |
177 | space, "", qh->period, qh->phase, qh->load); | |
1da177e4 LT |
178 | |
179 | if (element & UHCI_PTR_QH) | |
180 | out += sprintf(out, "%*s Element points to QH (bug?)\n", space, ""); | |
181 | ||
182 | if (element & UHCI_PTR_DEPTH) | |
183 | out += sprintf(out, "%*s Depth traverse\n", space, ""); | |
184 | ||
185 | if (element & cpu_to_le32(8)) | |
186 | out += sprintf(out, "%*s Bit 3 set (bug?)\n", space, ""); | |
187 | ||
188 | if (!(element & ~(UHCI_PTR_QH | UHCI_PTR_DEPTH))) | |
189 | out += sprintf(out, "%*s Element is NULL (bug?)\n", space, ""); | |
190 | ||
dccf4a48 AS |
191 | if (list_empty(&qh->queue)) { |
192 | out += sprintf(out, "%*s queue is empty\n", space, ""); | |
193 | } else { | |
194 | struct urb_priv *urbp = list_entry(qh->queue.next, | |
195 | struct urb_priv, node); | |
196 | struct uhci_td *td = list_entry(urbp->td_list.next, | |
197 | struct uhci_td, list); | |
198 | ||
199 | if (cpu_to_le32(td->dma_handle) != (element & ~UHCI_PTR_BITS)) | |
200 | out += sprintf(out, "%*s Element != First TD\n", | |
201 | space, ""); | |
202 | i = nurbs = 0; | |
203 | list_for_each_entry(urbp, &qh->queue, node) { | |
204 | if (++i <= 10) | |
205 | out += uhci_show_urbp(urbp, out, | |
206 | len - (out - buf), space + 2); | |
207 | else | |
208 | ++nurbs; | |
1da177e4 | 209 | } |
dccf4a48 AS |
210 | if (nurbs > 0) |
211 | out += sprintf(out, "%*s Skipped %d URBs\n", | |
212 | space, "", nurbs); | |
1da177e4 LT |
213 | } |
214 | ||
85a975d0 | 215 | if (qh->dummy_td) { |
af0bb599 AS |
216 | out += sprintf(out, "%*s Dummy TD\n", space, ""); |
217 | out += uhci_show_td(qh->dummy_td, out, len - (out - buf), 0); | |
218 | } | |
219 | ||
1da177e4 LT |
220 | return out - buf; |
221 | } | |
222 | ||
4c4c9432 | 223 | static const char * const qh_names[] = { |
dccf4a48 | 224 | "skel_unlink_qh", "skel_iso_qh", |
1da177e4 LT |
225 | "skel_int128_qh", "skel_int64_qh", |
226 | "skel_int32_qh", "skel_int16_qh", | |
227 | "skel_int8_qh", "skel_int4_qh", | |
228 | "skel_int2_qh", "skel_int1_qh", | |
229 | "skel_ls_control_qh", "skel_fs_control_qh", | |
230 | "skel_bulk_qh", "skel_term_qh" | |
231 | }; | |
232 | ||
1da177e4 LT |
233 | static int uhci_show_sc(int port, unsigned short status, char *buf, int len) |
234 | { | |
235 | char *out = buf; | |
236 | ||
237 | /* Try to make sure there's enough memory */ | |
238 | if (len < 160) | |
239 | return 0; | |
240 | ||
241 | out += sprintf(out, " stat%d = %04x %s%s%s%s%s%s%s%s%s%s\n", | |
242 | port, | |
243 | status, | |
244 | (status & USBPORTSC_SUSP) ? " Suspend" : "", | |
245 | (status & USBPORTSC_OCC) ? " OverCurrentChange" : "", | |
246 | (status & USBPORTSC_OC) ? " OverCurrent" : "", | |
247 | (status & USBPORTSC_PR) ? " Reset" : "", | |
248 | (status & USBPORTSC_LSDA) ? " LowSpeed" : "", | |
249 | (status & USBPORTSC_RD) ? " ResumeDetect" : "", | |
250 | (status & USBPORTSC_PEC) ? " EnableChange" : "", | |
251 | (status & USBPORTSC_PE) ? " Enabled" : "", | |
252 | (status & USBPORTSC_CSC) ? " ConnectChange" : "", | |
253 | (status & USBPORTSC_CCS) ? " Connected" : ""); | |
254 | ||
255 | return out - buf; | |
256 | } | |
257 | ||
c8f4fe43 AS |
258 | static int uhci_show_root_hub_state(struct uhci_hcd *uhci, char *buf, int len) |
259 | { | |
260 | char *out = buf; | |
261 | char *rh_state; | |
262 | ||
263 | /* Try to make sure there's enough memory */ | |
264 | if (len < 60) | |
265 | return 0; | |
266 | ||
267 | switch (uhci->rh_state) { | |
268 | case UHCI_RH_RESET: | |
269 | rh_state = "reset"; break; | |
270 | case UHCI_RH_SUSPENDED: | |
271 | rh_state = "suspended"; break; | |
272 | case UHCI_RH_AUTO_STOPPED: | |
273 | rh_state = "auto-stopped"; break; | |
274 | case UHCI_RH_RESUMING: | |
275 | rh_state = "resuming"; break; | |
276 | case UHCI_RH_SUSPENDING: | |
277 | rh_state = "suspending"; break; | |
278 | case UHCI_RH_RUNNING: | |
279 | rh_state = "running"; break; | |
280 | case UHCI_RH_RUNNING_NODEVS: | |
281 | rh_state = "running, no devs"; break; | |
282 | default: | |
283 | rh_state = "?"; break; | |
284 | } | |
84afddd7 AS |
285 | out += sprintf(out, "Root-hub state: %s FSBR: %d\n", |
286 | rh_state, uhci->fsbr_is_on); | |
c8f4fe43 AS |
287 | return out - buf; |
288 | } | |
289 | ||
1da177e4 LT |
290 | static int uhci_show_status(struct uhci_hcd *uhci, char *buf, int len) |
291 | { | |
292 | char *out = buf; | |
293 | unsigned long io_addr = uhci->io_addr; | |
294 | unsigned short usbcmd, usbstat, usbint, usbfrnum; | |
295 | unsigned int flbaseadd; | |
296 | unsigned char sof; | |
297 | unsigned short portsc1, portsc2; | |
298 | ||
299 | /* Try to make sure there's enough memory */ | |
c4334726 | 300 | if (len < 80 * 9) |
1da177e4 LT |
301 | return 0; |
302 | ||
303 | usbcmd = inw(io_addr + 0); | |
304 | usbstat = inw(io_addr + 2); | |
305 | usbint = inw(io_addr + 4); | |
306 | usbfrnum = inw(io_addr + 6); | |
307 | flbaseadd = inl(io_addr + 8); | |
308 | sof = inb(io_addr + 12); | |
309 | portsc1 = inw(io_addr + 16); | |
310 | portsc2 = inw(io_addr + 18); | |
311 | ||
312 | out += sprintf(out, " usbcmd = %04x %s%s%s%s%s%s%s%s\n", | |
313 | usbcmd, | |
314 | (usbcmd & USBCMD_MAXP) ? "Maxp64 " : "Maxp32 ", | |
315 | (usbcmd & USBCMD_CF) ? "CF " : "", | |
316 | (usbcmd & USBCMD_SWDBG) ? "SWDBG " : "", | |
317 | (usbcmd & USBCMD_FGR) ? "FGR " : "", | |
318 | (usbcmd & USBCMD_EGSM) ? "EGSM " : "", | |
319 | (usbcmd & USBCMD_GRESET) ? "GRESET " : "", | |
320 | (usbcmd & USBCMD_HCRESET) ? "HCRESET " : "", | |
321 | (usbcmd & USBCMD_RS) ? "RS " : ""); | |
322 | ||
323 | out += sprintf(out, " usbstat = %04x %s%s%s%s%s%s\n", | |
324 | usbstat, | |
325 | (usbstat & USBSTS_HCH) ? "HCHalted " : "", | |
326 | (usbstat & USBSTS_HCPE) ? "HostControllerProcessError " : "", | |
327 | (usbstat & USBSTS_HSE) ? "HostSystemError " : "", | |
328 | (usbstat & USBSTS_RD) ? "ResumeDetect " : "", | |
329 | (usbstat & USBSTS_ERROR) ? "USBError " : "", | |
330 | (usbstat & USBSTS_USBINT) ? "USBINT " : ""); | |
331 | ||
332 | out += sprintf(out, " usbint = %04x\n", usbint); | |
333 | out += sprintf(out, " usbfrnum = (%d)%03x\n", (usbfrnum >> 10) & 1, | |
334 | 0xfff & (4*(unsigned int)usbfrnum)); | |
335 | out += sprintf(out, " flbaseadd = %08x\n", flbaseadd); | |
336 | out += sprintf(out, " sof = %02x\n", sof); | |
337 | out += uhci_show_sc(1, portsc1, out, len - (out - buf)); | |
338 | out += uhci_show_sc(2, portsc2, out, len - (out - buf)); | |
c8155cc5 AS |
339 | out += sprintf(out, "Most recent frame: %x (%d) " |
340 | "Last ISO frame: %x (%d)\n", | |
341 | uhci->frame_number, uhci->frame_number & 1023, | |
342 | uhci->last_iso_frame, uhci->last_iso_frame & 1023); | |
1da177e4 LT |
343 | |
344 | return out - buf; | |
345 | } | |
346 | ||
1da177e4 LT |
347 | static int uhci_sprint_schedule(struct uhci_hcd *uhci, char *buf, int len) |
348 | { | |
1da177e4 LT |
349 | char *out = buf; |
350 | int i, j; | |
351 | struct uhci_qh *qh; | |
352 | struct uhci_td *td; | |
353 | struct list_head *tmp, *head; | |
f3fe239b | 354 | int nframes, nerrs; |
1da177e4 | 355 | |
c8f4fe43 | 356 | out += uhci_show_root_hub_state(uhci, out, len - (out - buf)); |
1da177e4 LT |
357 | out += sprintf(out, "HC status\n"); |
358 | out += uhci_show_status(uhci, out, len - (out - buf)); | |
3ca2a321 AS |
359 | |
360 | out += sprintf(out, "Periodic load table\n"); | |
361 | for (i = 0; i < MAX_PHASE; ++i) { | |
362 | out += sprintf(out, "\t%d", uhci->load[i]); | |
363 | if (i % 8 == 7) | |
364 | *out++ = '\n'; | |
365 | } | |
366 | out += sprintf(out, "Total: %d, #INT: %d, #ISO: %d\n", | |
367 | uhci->total_load, | |
368 | uhci_to_hcd(uhci)->self.bandwidth_int_reqs, | |
369 | uhci_to_hcd(uhci)->self.bandwidth_isoc_reqs); | |
dccf4a48 AS |
370 | if (debug <= 1) |
371 | return out - buf; | |
1da177e4 LT |
372 | |
373 | out += sprintf(out, "Frame List\n"); | |
f3fe239b AS |
374 | nframes = 10; |
375 | nerrs = 0; | |
1da177e4 | 376 | for (i = 0; i < UHCI_NUMFRAMES; ++i) { |
f3fe239b AS |
377 | __le32 link, qh_dma; |
378 | ||
379 | j = 0; | |
a1d59ce8 | 380 | td = uhci->frame_cpu[i]; |
f3fe239b | 381 | link = uhci->frame[i]; |
1da177e4 | 382 | if (!td) |
f3fe239b | 383 | goto check_link; |
1da177e4 | 384 | |
f3fe239b AS |
385 | if (nframes > 0) { |
386 | out += sprintf(out, "- Frame %d -> (%08x)\n", | |
387 | i, le32_to_cpu(link)); | |
388 | j = 1; | |
389 | } | |
1da177e4 LT |
390 | |
391 | head = &td->fl_list; | |
392 | tmp = head; | |
393 | do { | |
394 | td = list_entry(tmp, struct uhci_td, fl_list); | |
395 | tmp = tmp->next; | |
f3fe239b AS |
396 | if (cpu_to_le32(td->dma_handle) != link) { |
397 | if (nframes > 0) | |
398 | out += sprintf(out, " link does " | |
399 | "not match list entry!\n"); | |
400 | else | |
401 | ++nerrs; | |
402 | } | |
403 | if (nframes > 0) | |
404 | out += uhci_show_td(td, out, | |
405 | len - (out - buf), 4); | |
406 | link = td->link; | |
1da177e4 | 407 | } while (tmp != head); |
f3fe239b AS |
408 | |
409 | check_link: | |
410 | qh_dma = uhci_frame_skel_link(uhci, i); | |
411 | if (link != qh_dma) { | |
412 | if (nframes > 0) { | |
413 | if (!j) { | |
414 | out += sprintf(out, | |
415 | "- Frame %d -> (%08x)\n", | |
416 | i, le32_to_cpu(link)); | |
417 | j = 1; | |
418 | } | |
419 | out += sprintf(out, " link does not match " | |
420 | "QH (%08x)!\n", le32_to_cpu(qh_dma)); | |
421 | } else | |
422 | ++nerrs; | |
423 | } | |
424 | nframes -= j; | |
1da177e4 | 425 | } |
f3fe239b AS |
426 | if (nerrs > 0) |
427 | out += sprintf(out, "Skipped %d bad links\n", nerrs); | |
1da177e4 | 428 | |
687f5f34 | 429 | out += sprintf(out, "Skeleton QHs\n"); |
1da177e4 LT |
430 | |
431 | for (i = 0; i < UHCI_NUM_SKELQH; ++i) { | |
dccf4a48 | 432 | int cnt = 0; |
1da177e4 LT |
433 | |
434 | qh = uhci->skelqh[i]; | |
dccf4a48 AS |
435 | out += sprintf(out, "- %s\n", qh_names[i]); \ |
436 | out += uhci_show_qh(qh, out, len - (out - buf), 4); | |
1da177e4 LT |
437 | |
438 | /* Last QH is the Terminating QH, it's different */ | |
439 | if (i == UHCI_NUM_SKELQH - 1) { | |
440 | if (qh->link != UHCI_PTR_TERM) | |
441 | out += sprintf(out, " bandwidth reclamation on!\n"); | |
442 | ||
443 | if (qh_element(qh) != cpu_to_le32(uhci->term_td->dma_handle)) | |
444 | out += sprintf(out, " skel_term_qh element is not set to term_td!\n"); | |
445 | ||
446 | continue; | |
447 | } | |
448 | ||
dccf4a48 AS |
449 | j = (i < 9) ? 9 : i+1; /* Next skeleton */ |
450 | head = &qh->node; | |
1da177e4 LT |
451 | tmp = head->next; |
452 | ||
453 | while (tmp != head) { | |
dccf4a48 | 454 | qh = list_entry(tmp, struct uhci_qh, node); |
1da177e4 | 455 | tmp = tmp->next; |
dccf4a48 AS |
456 | if (++cnt <= 10) |
457 | out += uhci_show_qh(qh, out, | |
458 | len - (out - buf), 4); | |
1da177e4 | 459 | } |
dccf4a48 AS |
460 | if ((cnt -= 10) > 0) |
461 | out += sprintf(out, " Skipped %d QHs\n", cnt); | |
1da177e4 | 462 | |
dccf4a48 | 463 | if (i > 1 && i < UHCI_NUM_SKELQH - 1) { |
1da177e4 LT |
464 | if (qh->link != |
465 | (cpu_to_le32(uhci->skelqh[j]->dma_handle) | UHCI_PTR_QH)) | |
466 | out += sprintf(out, " last QH not linked to next skeleton!\n"); | |
467 | } | |
468 | } | |
469 | ||
1da177e4 LT |
470 | return out - buf; |
471 | } | |
472 | ||
8d402e1a AS |
473 | #ifdef CONFIG_DEBUG_FS |
474 | ||
1da177e4 LT |
475 | #define MAX_OUTPUT (64 * 1024) |
476 | ||
477 | struct uhci_debug { | |
478 | int size; | |
479 | char *data; | |
1da177e4 LT |
480 | }; |
481 | ||
482 | static int uhci_debug_open(struct inode *inode, struct file *file) | |
483 | { | |
8e18e294 | 484 | struct uhci_hcd *uhci = inode->i_private; |
1da177e4 LT |
485 | struct uhci_debug *up; |
486 | int ret = -ENOMEM; | |
dccf4a48 | 487 | unsigned long flags; |
1da177e4 LT |
488 | |
489 | lock_kernel(); | |
490 | up = kmalloc(sizeof(*up), GFP_KERNEL); | |
491 | if (!up) | |
492 | goto out; | |
493 | ||
494 | up->data = kmalloc(MAX_OUTPUT, GFP_KERNEL); | |
495 | if (!up->data) { | |
496 | kfree(up); | |
497 | goto out; | |
498 | } | |
499 | ||
8d402e1a | 500 | up->size = 0; |
dccf4a48 | 501 | spin_lock_irqsave(&uhci->lock, flags); |
8d402e1a AS |
502 | if (uhci->is_initialized) |
503 | up->size = uhci_sprint_schedule(uhci, up->data, MAX_OUTPUT); | |
dccf4a48 | 504 | spin_unlock_irqrestore(&uhci->lock, flags); |
1da177e4 LT |
505 | |
506 | file->private_data = up; | |
507 | ||
508 | ret = 0; | |
509 | out: | |
510 | unlock_kernel(); | |
511 | return ret; | |
512 | } | |
513 | ||
514 | static loff_t uhci_debug_lseek(struct file *file, loff_t off, int whence) | |
515 | { | |
516 | struct uhci_debug *up; | |
517 | loff_t new = -1; | |
518 | ||
519 | lock_kernel(); | |
520 | up = file->private_data; | |
521 | ||
522 | switch (whence) { | |
523 | case 0: | |
524 | new = off; | |
525 | break; | |
526 | case 1: | |
527 | new = file->f_pos + off; | |
528 | break; | |
529 | } | |
530 | if (new < 0 || new > up->size) { | |
531 | unlock_kernel(); | |
532 | return -EINVAL; | |
533 | } | |
534 | unlock_kernel(); | |
535 | return (file->f_pos = new); | |
536 | } | |
537 | ||
538 | static ssize_t uhci_debug_read(struct file *file, char __user *buf, | |
539 | size_t nbytes, loff_t *ppos) | |
540 | { | |
541 | struct uhci_debug *up = file->private_data; | |
542 | return simple_read_from_buffer(buf, nbytes, ppos, up->data, up->size); | |
543 | } | |
544 | ||
545 | static int uhci_debug_release(struct inode *inode, struct file *file) | |
546 | { | |
547 | struct uhci_debug *up = file->private_data; | |
548 | ||
549 | kfree(up->data); | |
550 | kfree(up); | |
551 | ||
552 | return 0; | |
553 | } | |
554 | ||
8d402e1a | 555 | #undef uhci_debug_operations |
066202dd | 556 | static const struct file_operations uhci_debug_operations = { |
8d402e1a | 557 | .owner = THIS_MODULE, |
1da177e4 LT |
558 | .open = uhci_debug_open, |
559 | .llseek = uhci_debug_lseek, | |
560 | .read = uhci_debug_read, | |
561 | .release = uhci_debug_release, | |
562 | }; | |
563 | ||
8d402e1a | 564 | #endif /* CONFIG_DEBUG_FS */ |
1da177e4 | 565 | |
8d402e1a AS |
566 | #else /* DEBUG */ |
567 | ||
568 | static inline void lprintk(char *buf) | |
569 | {} | |
570 | ||
571 | static inline int uhci_show_qh(struct uhci_qh *qh, char *buf, | |
572 | int len, int space) | |
573 | { | |
574 | return 0; | |
575 | } | |
576 | ||
577 | static inline int uhci_sprint_schedule(struct uhci_hcd *uhci, | |
578 | char *buf, int len) | |
579 | { | |
580 | return 0; | |
581 | } | |
1da177e4 LT |
582 | |
583 | #endif |