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0001 // SPDX-License-Identifier: GPL-2.0+
0002 /*
0003  * Copyright (c) 2001-2002 by David Brownell
0004  */
0005 
0006 /* this file is part of ehci-hcd.c */
0007 
0008 #ifdef CONFIG_DYNAMIC_DEBUG
0009 
0010 /*
0011  * check the values in the HCSPARAMS register
0012  * (host controller _Structural_ parameters)
0013  * see EHCI spec, Table 2-4 for each value
0014  */
0015 static void dbg_hcs_params(struct ehci_hcd *ehci, char *label)
0016 {
0017     u32 params = ehci_readl(ehci, &ehci->caps->hcs_params);
0018 
0019     ehci_dbg(ehci,
0020         "%s hcs_params 0x%x dbg=%d%s cc=%d pcc=%d%s%s ports=%d\n",
0021         label, params,
0022         HCS_DEBUG_PORT(params),
0023         HCS_INDICATOR(params) ? " ind" : "",
0024         HCS_N_CC(params),
0025         HCS_N_PCC(params),
0026         HCS_PORTROUTED(params) ? "" : " ordered",
0027         HCS_PPC(params) ? "" : " !ppc",
0028         HCS_N_PORTS(params));
0029     /* Port routing, per EHCI 0.95 Spec, Section 2.2.5 */
0030     if (HCS_PORTROUTED(params)) {
0031         int i;
0032         char buf[46], tmp[7], byte;
0033 
0034         buf[0] = 0;
0035         for (i = 0; i < HCS_N_PORTS(params); i++) {
0036             /* FIXME MIPS won't readb() ... */
0037             byte = readb(&ehci->caps->portroute[(i >> 1)]);
0038             sprintf(tmp, "%d ",
0039                 (i & 0x1) ? byte & 0xf : (byte >> 4) & 0xf);
0040             strcat(buf, tmp);
0041         }
0042         ehci_dbg(ehci, "%s portroute %s\n", label, buf);
0043     }
0044 }
0045 
0046 /*
0047  * check the values in the HCCPARAMS register
0048  * (host controller _Capability_ parameters)
0049  * see EHCI Spec, Table 2-5 for each value
0050  */
0051 static void dbg_hcc_params(struct ehci_hcd *ehci, char *label)
0052 {
0053     u32 params = ehci_readl(ehci, &ehci->caps->hcc_params);
0054 
0055     if (HCC_ISOC_CACHE(params)) {
0056         ehci_dbg(ehci,
0057             "%s hcc_params %04x caching frame %s%s%s\n",
0058             label, params,
0059             HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024",
0060             HCC_CANPARK(params) ? " park" : "",
0061             HCC_64BIT_ADDR(params) ? " 64 bit addr" : "");
0062     } else {
0063         ehci_dbg(ehci,
0064             "%s hcc_params %04x thresh %d uframes %s%s%s%s%s%s%s\n",
0065             label,
0066             params,
0067             HCC_ISOC_THRES(params),
0068             HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024",
0069             HCC_CANPARK(params) ? " park" : "",
0070             HCC_64BIT_ADDR(params) ? " 64 bit addr" : "",
0071             HCC_LPM(params) ? " LPM" : "",
0072             HCC_PER_PORT_CHANGE_EVENT(params) ? " ppce" : "",
0073             HCC_HW_PREFETCH(params) ? " hw prefetch" : "",
0074             HCC_32FRAME_PERIODIC_LIST(params) ?
0075                 " 32 periodic list" : "");
0076     }
0077 }
0078 
0079 static void __maybe_unused
0080 dbg_qtd(const char *label, struct ehci_hcd *ehci, struct ehci_qtd *qtd)
0081 {
0082     ehci_dbg(ehci, "%s td %p n%08x %08x t%08x p0=%08x\n", label, qtd,
0083         hc32_to_cpup(ehci, &qtd->hw_next),
0084         hc32_to_cpup(ehci, &qtd->hw_alt_next),
0085         hc32_to_cpup(ehci, &qtd->hw_token),
0086         hc32_to_cpup(ehci, &qtd->hw_buf[0]));
0087     if (qtd->hw_buf[1])
0088         ehci_dbg(ehci, "  p1=%08x p2=%08x p3=%08x p4=%08x\n",
0089             hc32_to_cpup(ehci, &qtd->hw_buf[1]),
0090             hc32_to_cpup(ehci, &qtd->hw_buf[2]),
0091             hc32_to_cpup(ehci, &qtd->hw_buf[3]),
0092             hc32_to_cpup(ehci, &qtd->hw_buf[4]));
0093 }
0094 
0095 static void __maybe_unused
0096 dbg_qh(const char *label, struct ehci_hcd *ehci, struct ehci_qh *qh)
0097 {
0098     struct ehci_qh_hw *hw = qh->hw;
0099 
0100     ehci_dbg(ehci, "%s qh %p n%08x info %x %x qtd %x\n", label,
0101         qh, hw->hw_next, hw->hw_info1, hw->hw_info2, hw->hw_current);
0102     dbg_qtd("overlay", ehci, (struct ehci_qtd *) &hw->hw_qtd_next);
0103 }
0104 
0105 static void __maybe_unused
0106 dbg_itd(const char *label, struct ehci_hcd *ehci, struct ehci_itd *itd)
0107 {
0108     ehci_dbg(ehci, "%s [%d] itd %p, next %08x, urb %p\n",
0109         label, itd->frame, itd, hc32_to_cpu(ehci, itd->hw_next),
0110         itd->urb);
0111     ehci_dbg(ehci,
0112         "  trans: %08x %08x %08x %08x %08x %08x %08x %08x\n",
0113         hc32_to_cpu(ehci, itd->hw_transaction[0]),
0114         hc32_to_cpu(ehci, itd->hw_transaction[1]),
0115         hc32_to_cpu(ehci, itd->hw_transaction[2]),
0116         hc32_to_cpu(ehci, itd->hw_transaction[3]),
0117         hc32_to_cpu(ehci, itd->hw_transaction[4]),
0118         hc32_to_cpu(ehci, itd->hw_transaction[5]),
0119         hc32_to_cpu(ehci, itd->hw_transaction[6]),
0120         hc32_to_cpu(ehci, itd->hw_transaction[7]));
0121     ehci_dbg(ehci,
0122         "  buf:   %08x %08x %08x %08x %08x %08x %08x\n",
0123         hc32_to_cpu(ehci, itd->hw_bufp[0]),
0124         hc32_to_cpu(ehci, itd->hw_bufp[1]),
0125         hc32_to_cpu(ehci, itd->hw_bufp[2]),
0126         hc32_to_cpu(ehci, itd->hw_bufp[3]),
0127         hc32_to_cpu(ehci, itd->hw_bufp[4]),
0128         hc32_to_cpu(ehci, itd->hw_bufp[5]),
0129         hc32_to_cpu(ehci, itd->hw_bufp[6]));
0130     ehci_dbg(ehci, "  index: %d %d %d %d %d %d %d %d\n",
0131         itd->index[0], itd->index[1], itd->index[2],
0132         itd->index[3], itd->index[4], itd->index[5],
0133         itd->index[6], itd->index[7]);
0134 }
0135 
0136 static void __maybe_unused
0137 dbg_sitd(const char *label, struct ehci_hcd *ehci, struct ehci_sitd *sitd)
0138 {
0139     ehci_dbg(ehci, "%s [%d] sitd %p, next %08x, urb %p\n",
0140         label, sitd->frame, sitd, hc32_to_cpu(ehci, sitd->hw_next),
0141         sitd->urb);
0142     ehci_dbg(ehci,
0143         "  addr %08x sched %04x result %08x buf %08x %08x\n",
0144         hc32_to_cpu(ehci, sitd->hw_fullspeed_ep),
0145         hc32_to_cpu(ehci, sitd->hw_uframe),
0146         hc32_to_cpu(ehci, sitd->hw_results),
0147         hc32_to_cpu(ehci, sitd->hw_buf[0]),
0148         hc32_to_cpu(ehci, sitd->hw_buf[1]));
0149 }
0150 
0151 static int __maybe_unused
0152 dbg_status_buf(char *buf, unsigned len, const char *label, u32 status)
0153 {
0154     return scnprintf(buf, len,
0155         "%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s%s",
0156         label, label[0] ? " " : "", status,
0157         (status & STS_PPCE_MASK) ? " PPCE" : "",
0158         (status & STS_ASS) ? " Async" : "",
0159         (status & STS_PSS) ? " Periodic" : "",
0160         (status & STS_RECL) ? " Recl" : "",
0161         (status & STS_HALT) ? " Halt" : "",
0162         (status & STS_IAA) ? " IAA" : "",
0163         (status & STS_FATAL) ? " FATAL" : "",
0164         (status & STS_FLR) ? " FLR" : "",
0165         (status & STS_PCD) ? " PCD" : "",
0166         (status & STS_ERR) ? " ERR" : "",
0167         (status & STS_INT) ? " INT" : "");
0168 }
0169 
0170 static int __maybe_unused
0171 dbg_intr_buf(char *buf, unsigned len, const char *label, u32 enable)
0172 {
0173     return scnprintf(buf, len,
0174         "%s%sintrenable %02x%s%s%s%s%s%s%s",
0175         label, label[0] ? " " : "", enable,
0176         (enable & STS_PPCE_MASK) ? " PPCE" : "",
0177         (enable & STS_IAA) ? " IAA" : "",
0178         (enable & STS_FATAL) ? " FATAL" : "",
0179         (enable & STS_FLR) ? " FLR" : "",
0180         (enable & STS_PCD) ? " PCD" : "",
0181         (enable & STS_ERR) ? " ERR" : "",
0182         (enable & STS_INT) ? " INT" : "");
0183 }
0184 
0185 static const char *const fls_strings[] = { "1024", "512", "256", "??" };
0186 
0187 static int
0188 dbg_command_buf(char *buf, unsigned len, const char *label, u32 command)
0189 {
0190     return scnprintf(buf, len,
0191         "%s%scommand %07x %s%s%s%s%s%s=%d ithresh=%d%s%s%s%s "
0192         "period=%s%s %s",
0193         label, label[0] ? " " : "", command,
0194         (command & CMD_HIRD) ? " HIRD" : "",
0195         (command & CMD_PPCEE) ? " PPCEE" : "",
0196         (command & CMD_FSP) ? " FSP" : "",
0197         (command & CMD_ASPE) ? " ASPE" : "",
0198         (command & CMD_PSPE) ? " PSPE" : "",
0199         (command & CMD_PARK) ? " park" : "(park)",
0200         CMD_PARK_CNT(command),
0201         (command >> 16) & 0x3f,
0202         (command & CMD_LRESET) ? " LReset" : "",
0203         (command & CMD_IAAD) ? " IAAD" : "",
0204         (command & CMD_ASE) ? " Async" : "",
0205         (command & CMD_PSE) ? " Periodic" : "",
0206         fls_strings[(command >> 2) & 0x3],
0207         (command & CMD_RESET) ? " Reset" : "",
0208         (command & CMD_RUN) ? "RUN" : "HALT");
0209 }
0210 
0211 static int
0212 dbg_port_buf(char *buf, unsigned len, const char *label, int port, u32 status)
0213 {
0214     char    *sig;
0215 
0216     /* signaling state */
0217     switch (status & (3 << 10)) {
0218     case 0 << 10:
0219         sig = "se0";
0220         break;
0221     case 1 << 10: /* low speed */
0222         sig = "k";
0223         break;
0224     case 2 << 10:
0225         sig = "j";
0226         break;
0227     default:
0228         sig = "?";
0229         break;
0230     }
0231 
0232     return scnprintf(buf, len,
0233         "%s%sport:%d status %06x %d %s%s%s%s%s%s "
0234         "sig=%s%s%s%s%s%s%s%s%s%s%s",
0235         label, label[0] ? " " : "", port, status,
0236         status >> 25, /*device address */
0237         (status & PORT_SSTS) >> 23 == PORTSC_SUSPEND_STS_ACK ?
0238                         " ACK" : "",
0239         (status & PORT_SSTS) >> 23 == PORTSC_SUSPEND_STS_NYET ?
0240                         " NYET" : "",
0241         (status & PORT_SSTS) >> 23 == PORTSC_SUSPEND_STS_STALL ?
0242                         " STALL" : "",
0243         (status & PORT_SSTS) >> 23 == PORTSC_SUSPEND_STS_ERR ?
0244                         " ERR" : "",
0245         (status & PORT_POWER) ? " POWER" : "",
0246         (status & PORT_OWNER) ? " OWNER" : "",
0247         sig,
0248         (status & PORT_LPM) ? " LPM" : "",
0249         (status & PORT_RESET) ? " RESET" : "",
0250         (status & PORT_SUSPEND) ? " SUSPEND" : "",
0251         (status & PORT_RESUME) ? " RESUME" : "",
0252         (status & PORT_OCC) ? " OCC" : "",
0253         (status & PORT_OC) ? " OC" : "",
0254         (status & PORT_PEC) ? " PEC" : "",
0255         (status & PORT_PE) ? " PE" : "",
0256         (status & PORT_CSC) ? " CSC" : "",
0257         (status & PORT_CONNECT) ? " CONNECT" : "");
0258 }
0259 
0260 static inline void
0261 dbg_status(struct ehci_hcd *ehci, const char *label, u32 status)
0262 {
0263     char buf[80];
0264 
0265     dbg_status_buf(buf, sizeof(buf), label, status);
0266     ehci_dbg(ehci, "%s\n", buf);
0267 }
0268 
0269 static inline void
0270 dbg_cmd(struct ehci_hcd *ehci, const char *label, u32 command)
0271 {
0272     char buf[80];
0273 
0274     dbg_command_buf(buf, sizeof(buf), label, command);
0275     ehci_dbg(ehci, "%s\n", buf);
0276 }
0277 
0278 static inline void
0279 dbg_port(struct ehci_hcd *ehci, const char *label, int port, u32 status)
0280 {
0281     char buf[80];
0282 
0283     dbg_port_buf(buf, sizeof(buf), label, port, status);
0284     ehci_dbg(ehci, "%s\n", buf);
0285 }
0286 
0287 /*-------------------------------------------------------------------------*/
0288 
0289 /* troubleshooting help: expose state in debugfs */
0290 
0291 static int debug_async_open(struct inode *, struct file *);
0292 static int debug_bandwidth_open(struct inode *, struct file *);
0293 static int debug_periodic_open(struct inode *, struct file *);
0294 static int debug_registers_open(struct inode *, struct file *);
0295 
0296 static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
0297 static int debug_close(struct inode *, struct file *);
0298 
0299 static const struct file_operations debug_async_fops = {
0300     .owner      = THIS_MODULE,
0301     .open       = debug_async_open,
0302     .read       = debug_output,
0303     .release    = debug_close,
0304     .llseek     = default_llseek,
0305 };
0306 
0307 static const struct file_operations debug_bandwidth_fops = {
0308     .owner      = THIS_MODULE,
0309     .open       = debug_bandwidth_open,
0310     .read       = debug_output,
0311     .release    = debug_close,
0312     .llseek     = default_llseek,
0313 };
0314 
0315 static const struct file_operations debug_periodic_fops = {
0316     .owner      = THIS_MODULE,
0317     .open       = debug_periodic_open,
0318     .read       = debug_output,
0319     .release    = debug_close,
0320     .llseek     = default_llseek,
0321 };
0322 
0323 static const struct file_operations debug_registers_fops = {
0324     .owner      = THIS_MODULE,
0325     .open       = debug_registers_open,
0326     .read       = debug_output,
0327     .release    = debug_close,
0328     .llseek     = default_llseek,
0329 };
0330 
0331 static struct dentry *ehci_debug_root;
0332 
0333 struct debug_buffer {
0334     ssize_t (*fill_func)(struct debug_buffer *);    /* fill method */
0335     struct usb_bus *bus;
0336     struct mutex mutex; /* protect filling of buffer */
0337     size_t count;       /* number of characters filled into buffer */
0338     char *output_buf;
0339     size_t alloc_size;
0340 };
0341 
0342 static inline char speed_char(u32 info1)
0343 {
0344     switch (info1 & (3 << 12)) {
0345     case QH_FULL_SPEED:
0346         return 'f';
0347     case QH_LOW_SPEED:
0348         return 'l';
0349     case QH_HIGH_SPEED:
0350         return 'h';
0351     default:
0352         return '?';
0353     }
0354 }
0355 
0356 static inline char token_mark(struct ehci_hcd *ehci, __hc32 token)
0357 {
0358     __u32 v = hc32_to_cpu(ehci, token);
0359 
0360     if (v & QTD_STS_ACTIVE)
0361         return '*';
0362     if (v & QTD_STS_HALT)
0363         return '-';
0364     if (!IS_SHORT_READ(v))
0365         return ' ';
0366     /* tries to advance through hw_alt_next */
0367     return '/';
0368 }
0369 
0370 static void qh_lines(struct ehci_hcd *ehci, struct ehci_qh *qh,
0371         char **nextp, unsigned *sizep)
0372 {
0373     u32         scratch;
0374     u32         hw_curr;
0375     struct list_head    *entry;
0376     struct ehci_qtd     *td;
0377     unsigned        temp;
0378     unsigned        size = *sizep;
0379     char            *next = *nextp;
0380     char            mark;
0381     __le32          list_end = EHCI_LIST_END(ehci);
0382     struct ehci_qh_hw   *hw = qh->hw;
0383 
0384     if (hw->hw_qtd_next == list_end)    /* NEC does this */
0385         mark = '@';
0386     else
0387         mark = token_mark(ehci, hw->hw_token);
0388     if (mark == '/') {  /* qh_alt_next controls qh advance? */
0389         if ((hw->hw_alt_next & QTD_MASK(ehci))
0390                 == ehci->async->hw->hw_alt_next)
0391             mark = '#'; /* blocked */
0392         else if (hw->hw_alt_next == list_end)
0393             mark = '.'; /* use hw_qtd_next */
0394         /* else alt_next points to some other qtd */
0395     }
0396     scratch = hc32_to_cpup(ehci, &hw->hw_info1);
0397     hw_curr = (mark == '*') ? hc32_to_cpup(ehci, &hw->hw_current) : 0;
0398     temp = scnprintf(next, size,
0399             "qh/%p dev%d %cs ep%d %08x %08x (%08x%c %s nak%d)"
0400             " [cur %08x next %08x buf[0] %08x]",
0401             qh, scratch & 0x007f,
0402             speed_char (scratch),
0403             (scratch >> 8) & 0x000f,
0404             scratch, hc32_to_cpup(ehci, &hw->hw_info2),
0405             hc32_to_cpup(ehci, &hw->hw_token), mark,
0406             (cpu_to_hc32(ehci, QTD_TOGGLE) & hw->hw_token)
0407                 ? "data1" : "data0",
0408             (hc32_to_cpup(ehci, &hw->hw_alt_next) >> 1) & 0x0f,
0409             hc32_to_cpup(ehci, &hw->hw_current),
0410             hc32_to_cpup(ehci, &hw->hw_qtd_next),
0411             hc32_to_cpup(ehci, &hw->hw_buf[0]));
0412     size -= temp;
0413     next += temp;
0414 
0415     /* hc may be modifying the list as we read it ... */
0416     list_for_each(entry, &qh->qtd_list) {
0417         char *type;
0418 
0419         td = list_entry(entry, struct ehci_qtd, qtd_list);
0420         scratch = hc32_to_cpup(ehci, &td->hw_token);
0421         mark = ' ';
0422         if (hw_curr == td->qtd_dma) {
0423             mark = '*';
0424         } else if (hw->hw_qtd_next == cpu_to_hc32(ehci, td->qtd_dma)) {
0425             mark = '+';
0426         } else if (QTD_LENGTH(scratch)) {
0427             if (td->hw_alt_next == ehci->async->hw->hw_alt_next)
0428                 mark = '#';
0429             else if (td->hw_alt_next != list_end)
0430                 mark = '/';
0431         }
0432         switch ((scratch >> 8) & 0x03) {
0433         case 0:
0434             type = "out";
0435             break;
0436         case 1:
0437             type = "in";
0438             break;
0439         case 2:
0440             type = "setup";
0441             break;
0442         default:
0443             type = "?";
0444             break;
0445         }
0446         temp = scnprintf(next, size,
0447                 "\n\t%p%c%s len=%d %08x urb %p"
0448                 " [td %08x buf[0] %08x]",
0449                 td, mark, type,
0450                 (scratch >> 16) & 0x7fff,
0451                 scratch,
0452                 td->urb,
0453                 (u32) td->qtd_dma,
0454                 hc32_to_cpup(ehci, &td->hw_buf[0]));
0455         size -= temp;
0456         next += temp;
0457         if (temp == size)
0458             goto done;
0459     }
0460 
0461     temp = scnprintf(next, size, "\n");
0462     size -= temp;
0463     next += temp;
0464 
0465 done:
0466     *sizep = size;
0467     *nextp = next;
0468 }
0469 
0470 static ssize_t fill_async_buffer(struct debug_buffer *buf)
0471 {
0472     struct usb_hcd      *hcd;
0473     struct ehci_hcd     *ehci;
0474     unsigned long       flags;
0475     unsigned        temp, size;
0476     char            *next;
0477     struct ehci_qh      *qh;
0478 
0479     hcd = bus_to_hcd(buf->bus);
0480     ehci = hcd_to_ehci(hcd);
0481     next = buf->output_buf;
0482     size = buf->alloc_size;
0483 
0484     *next = 0;
0485 
0486     /*
0487      * dumps a snapshot of the async schedule.
0488      * usually empty except for long-term bulk reads, or head.
0489      * one QH per line, and TDs we know about
0490      */
0491     spin_lock_irqsave(&ehci->lock, flags);
0492     for (qh = ehci->async->qh_next.qh; size > 0 && qh; qh = qh->qh_next.qh)
0493         qh_lines(ehci, qh, &next, &size);
0494     if (!list_empty(&ehci->async_unlink) && size > 0) {
0495         temp = scnprintf(next, size, "\nunlink =\n");
0496         size -= temp;
0497         next += temp;
0498 
0499         list_for_each_entry(qh, &ehci->async_unlink, unlink_node) {
0500             if (size <= 0)
0501                 break;
0502             qh_lines(ehci, qh, &next, &size);
0503         }
0504     }
0505     spin_unlock_irqrestore(&ehci->lock, flags);
0506 
0507     return strlen(buf->output_buf);
0508 }
0509 
0510 static ssize_t fill_bandwidth_buffer(struct debug_buffer *buf)
0511 {
0512     struct ehci_hcd     *ehci;
0513     struct ehci_tt      *tt;
0514     struct ehci_per_sched   *ps;
0515     unsigned        temp, size;
0516     char            *next;
0517     unsigned        i;
0518     u8          *bw;
0519     u16         *bf;
0520     u8          budget[EHCI_BANDWIDTH_SIZE];
0521 
0522     ehci = hcd_to_ehci(bus_to_hcd(buf->bus));
0523     next = buf->output_buf;
0524     size = buf->alloc_size;
0525 
0526     *next = 0;
0527 
0528     spin_lock_irq(&ehci->lock);
0529 
0530     /* Dump the HS bandwidth table */
0531     temp = scnprintf(next, size,
0532             "HS bandwidth allocation (us per microframe)\n");
0533     size -= temp;
0534     next += temp;
0535     for (i = 0; i < EHCI_BANDWIDTH_SIZE; i += 8) {
0536         bw = &ehci->bandwidth[i];
0537         temp = scnprintf(next, size,
0538                 "%2u: %4u%4u%4u%4u%4u%4u%4u%4u\n",
0539                 i, bw[0], bw[1], bw[2], bw[3],
0540                     bw[4], bw[5], bw[6], bw[7]);
0541         size -= temp;
0542         next += temp;
0543     }
0544 
0545     /* Dump all the FS/LS tables */
0546     list_for_each_entry(tt, &ehci->tt_list, tt_list) {
0547         temp = scnprintf(next, size,
0548                 "\nTT %s port %d  FS/LS bandwidth allocation (us per frame)\n",
0549                 dev_name(&tt->usb_tt->hub->dev),
0550                 tt->tt_port + !!tt->usb_tt->multi);
0551         size -= temp;
0552         next += temp;
0553 
0554         bf = tt->bandwidth;
0555         temp = scnprintf(next, size,
0556                 "  %5u%5u%5u%5u%5u%5u%5u%5u\n",
0557                 bf[0], bf[1], bf[2], bf[3],
0558                     bf[4], bf[5], bf[6], bf[7]);
0559         size -= temp;
0560         next += temp;
0561 
0562         temp = scnprintf(next, size,
0563                 "FS/LS budget (us per microframe)\n");
0564         size -= temp;
0565         next += temp;
0566         compute_tt_budget(budget, tt);
0567         for (i = 0; i < EHCI_BANDWIDTH_SIZE; i += 8) {
0568             bw = &budget[i];
0569             temp = scnprintf(next, size,
0570                     "%2u: %4u%4u%4u%4u%4u%4u%4u%4u\n",
0571                     i, bw[0], bw[1], bw[2], bw[3],
0572                         bw[4], bw[5], bw[6], bw[7]);
0573             size -= temp;
0574             next += temp;
0575         }
0576         list_for_each_entry(ps, &tt->ps_list, ps_list) {
0577             temp = scnprintf(next, size,
0578                     "%s ep %02x:  %4u @ %2u.%u+%u mask %04x\n",
0579                     dev_name(&ps->udev->dev),
0580                     ps->ep->desc.bEndpointAddress,
0581                     ps->tt_usecs,
0582                     ps->bw_phase, ps->phase_uf,
0583                     ps->bw_period, ps->cs_mask);
0584             size -= temp;
0585             next += temp;
0586         }
0587     }
0588     spin_unlock_irq(&ehci->lock);
0589 
0590     return next - buf->output_buf;
0591 }
0592 
0593 static unsigned output_buf_tds_dir(char *buf, struct ehci_hcd *ehci,
0594         struct ehci_qh_hw *hw, struct ehci_qh *qh, unsigned size)
0595 {
0596     u32         scratch = hc32_to_cpup(ehci, &hw->hw_info1);
0597     struct ehci_qtd     *qtd;
0598     char            *type = "";
0599     unsigned        temp = 0;
0600 
0601     /* count tds, get ep direction */
0602     list_for_each_entry(qtd, &qh->qtd_list, qtd_list) {
0603         temp++;
0604         switch ((hc32_to_cpu(ehci, qtd->hw_token) >> 8) & 0x03) {
0605         case 0:
0606             type = "out";
0607             continue;
0608         case 1:
0609             type = "in";
0610             continue;
0611         }
0612     }
0613 
0614     return scnprintf(buf, size, " (%c%d ep%d%s [%d/%d] q%d p%d)",
0615             speed_char(scratch), scratch & 0x007f,
0616             (scratch >> 8) & 0x000f, type, qh->ps.usecs,
0617             qh->ps.c_usecs, temp, 0x7ff & (scratch >> 16));
0618 }
0619 
0620 #define DBG_SCHED_LIMIT 64
0621 static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
0622 {
0623     struct usb_hcd      *hcd;
0624     struct ehci_hcd     *ehci;
0625     unsigned long       flags;
0626     union ehci_shadow   p, *seen;
0627     unsigned        temp, size, seen_count;
0628     char            *next;
0629     unsigned        i;
0630     __hc32          tag;
0631 
0632     seen = kmalloc_array(DBG_SCHED_LIMIT, sizeof(*seen), GFP_ATOMIC);
0633     if (!seen)
0634         return 0;
0635     seen_count = 0;
0636 
0637     hcd = bus_to_hcd(buf->bus);
0638     ehci = hcd_to_ehci(hcd);
0639     next = buf->output_buf;
0640     size = buf->alloc_size;
0641 
0642     temp = scnprintf(next, size, "size = %d\n", ehci->periodic_size);
0643     size -= temp;
0644     next += temp;
0645 
0646     /*
0647      * dump a snapshot of the periodic schedule.
0648      * iso changes, interrupt usually doesn't.
0649      */
0650     spin_lock_irqsave(&ehci->lock, flags);
0651     for (i = 0; i < ehci->periodic_size; i++) {
0652         p = ehci->pshadow[i];
0653         if (likely(!p.ptr))
0654             continue;
0655         tag = Q_NEXT_TYPE(ehci, ehci->periodic[i]);
0656 
0657         temp = scnprintf(next, size, "%4d: ", i);
0658         size -= temp;
0659         next += temp;
0660 
0661         do {
0662             struct ehci_qh_hw *hw;
0663 
0664             switch (hc32_to_cpu(ehci, tag)) {
0665             case Q_TYPE_QH:
0666                 hw = p.qh->hw;
0667                 temp = scnprintf(next, size, " qh%d-%04x/%p",
0668                         p.qh->ps.period,
0669                         hc32_to_cpup(ehci,
0670                             &hw->hw_info2)
0671                             /* uframe masks */
0672                             & (QH_CMASK | QH_SMASK),
0673                         p.qh);
0674                 size -= temp;
0675                 next += temp;
0676                 /* don't repeat what follows this qh */
0677                 for (temp = 0; temp < seen_count; temp++) {
0678                     if (seen[temp].ptr != p.ptr)
0679                         continue;
0680                     if (p.qh->qh_next.ptr) {
0681                         temp = scnprintf(next, size,
0682                             " ...");
0683                         size -= temp;
0684                         next += temp;
0685                     }
0686                     break;
0687                 }
0688                 /* show more info the first time around */
0689                 if (temp == seen_count) {
0690                     temp = output_buf_tds_dir(next, ehci,
0691                         hw, p.qh, size);
0692 
0693                     if (seen_count < DBG_SCHED_LIMIT)
0694                         seen[seen_count++].qh = p.qh;
0695                 } else {
0696                     temp = 0;
0697                 }
0698                 tag = Q_NEXT_TYPE(ehci, hw->hw_next);
0699                 p = p.qh->qh_next;
0700                 break;
0701             case Q_TYPE_FSTN:
0702                 temp = scnprintf(next, size,
0703                     " fstn-%8x/%p", p.fstn->hw_prev,
0704                     p.fstn);
0705                 tag = Q_NEXT_TYPE(ehci, p.fstn->hw_next);
0706                 p = p.fstn->fstn_next;
0707                 break;
0708             case Q_TYPE_ITD:
0709                 temp = scnprintf(next, size,
0710                     " itd/%p", p.itd);
0711                 tag = Q_NEXT_TYPE(ehci, p.itd->hw_next);
0712                 p = p.itd->itd_next;
0713                 break;
0714             case Q_TYPE_SITD:
0715                 temp = scnprintf(next, size,
0716                     " sitd%d-%04x/%p",
0717                     p.sitd->stream->ps.period,
0718                     hc32_to_cpup(ehci, &p.sitd->hw_uframe)
0719                         & 0x0000ffff,
0720                     p.sitd);
0721                 tag = Q_NEXT_TYPE(ehci, p.sitd->hw_next);
0722                 p = p.sitd->sitd_next;
0723                 break;
0724             }
0725             size -= temp;
0726             next += temp;
0727         } while (p.ptr);
0728 
0729         temp = scnprintf(next, size, "\n");
0730         size -= temp;
0731         next += temp;
0732     }
0733     spin_unlock_irqrestore(&ehci->lock, flags);
0734     kfree(seen);
0735 
0736     return buf->alloc_size - size;
0737 }
0738 #undef DBG_SCHED_LIMIT
0739 
0740 static const char *rh_state_string(struct ehci_hcd *ehci)
0741 {
0742     switch (ehci->rh_state) {
0743     case EHCI_RH_HALTED:
0744         return "halted";
0745     case EHCI_RH_SUSPENDED:
0746         return "suspended";
0747     case EHCI_RH_RUNNING:
0748         return "running";
0749     case EHCI_RH_STOPPING:
0750         return "stopping";
0751     }
0752     return "?";
0753 }
0754 
0755 static ssize_t fill_registers_buffer(struct debug_buffer *buf)
0756 {
0757     struct usb_hcd      *hcd;
0758     struct ehci_hcd     *ehci;
0759     unsigned long       flags;
0760     unsigned        temp, size, i;
0761     char            *next, scratch[80];
0762     static char     fmt[] = "%*s\n";
0763     static char     label[] = "";
0764 
0765     hcd = bus_to_hcd(buf->bus);
0766     ehci = hcd_to_ehci(hcd);
0767     next = buf->output_buf;
0768     size = buf->alloc_size;
0769 
0770     spin_lock_irqsave(&ehci->lock, flags);
0771 
0772     if (!HCD_HW_ACCESSIBLE(hcd)) {
0773         size = scnprintf(next, size,
0774             "bus %s, device %s\n"
0775             "%s\n"
0776             "SUSPENDED (no register access)\n",
0777             hcd->self.controller->bus->name,
0778             dev_name(hcd->self.controller),
0779             hcd->product_desc);
0780         goto done;
0781     }
0782 
0783     /* Capability Registers */
0784     i = HC_VERSION(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
0785     temp = scnprintf(next, size,
0786         "bus %s, device %s\n"
0787         "%s\n"
0788         "EHCI %x.%02x, rh state %s\n",
0789         hcd->self.controller->bus->name,
0790         dev_name(hcd->self.controller),
0791         hcd->product_desc,
0792         i >> 8, i & 0x0ff, rh_state_string(ehci));
0793     size -= temp;
0794     next += temp;
0795 
0796 #ifdef  CONFIG_USB_PCI
0797     /* EHCI 0.96 and later may have "extended capabilities" */
0798     if (dev_is_pci(hcd->self.controller)) {
0799         struct pci_dev  *pdev;
0800         u32     offset, cap, cap2;
0801         unsigned    count = 256 / 4;
0802 
0803         pdev = to_pci_dev(ehci_to_hcd(ehci)->self.controller);
0804         offset = HCC_EXT_CAPS(ehci_readl(ehci,
0805                 &ehci->caps->hcc_params));
0806         while (offset && count--) {
0807             pci_read_config_dword(pdev, offset, &cap);
0808             switch (cap & 0xff) {
0809             case 1:
0810                 temp = scnprintf(next, size,
0811                     "ownership %08x%s%s\n", cap,
0812                     (cap & (1 << 24)) ? " linux" : "",
0813                     (cap & (1 << 16)) ? " firmware" : "");
0814                 size -= temp;
0815                 next += temp;
0816 
0817                 offset += 4;
0818                 pci_read_config_dword(pdev, offset, &cap2);
0819                 temp = scnprintf(next, size,
0820                     "SMI sts/enable 0x%08x\n", cap2);
0821                 size -= temp;
0822                 next += temp;
0823                 break;
0824             case 0:     /* illegal reserved capability */
0825                 cap = 0;
0826                 fallthrough;
0827             default:        /* unknown */
0828                 break;
0829             }
0830             offset = (cap >> 8) & 0xff;
0831         }
0832     }
0833 #endif
0834 
0835     /* FIXME interpret both types of params */
0836     i = ehci_readl(ehci, &ehci->caps->hcs_params);
0837     temp = scnprintf(next, size, "structural params 0x%08x\n", i);
0838     size -= temp;
0839     next += temp;
0840 
0841     i = ehci_readl(ehci, &ehci->caps->hcc_params);
0842     temp = scnprintf(next, size, "capability params 0x%08x\n", i);
0843     size -= temp;
0844     next += temp;
0845 
0846     /* Operational Registers */
0847     temp = dbg_status_buf(scratch, sizeof(scratch), label,
0848             ehci_readl(ehci, &ehci->regs->status));
0849     temp = scnprintf(next, size, fmt, temp, scratch);
0850     size -= temp;
0851     next += temp;
0852 
0853     temp = dbg_command_buf(scratch, sizeof(scratch), label,
0854             ehci_readl(ehci, &ehci->regs->command));
0855     temp = scnprintf(next, size, fmt, temp, scratch);
0856     size -= temp;
0857     next += temp;
0858 
0859     temp = dbg_intr_buf(scratch, sizeof(scratch), label,
0860             ehci_readl(ehci, &ehci->regs->intr_enable));
0861     temp = scnprintf(next, size, fmt, temp, scratch);
0862     size -= temp;
0863     next += temp;
0864 
0865     temp = scnprintf(next, size, "uframe %04x\n",
0866             ehci_read_frame_index(ehci));
0867     size -= temp;
0868     next += temp;
0869 
0870     for (i = 1; i <= HCS_N_PORTS(ehci->hcs_params); i++) {
0871         temp = dbg_port_buf(scratch, sizeof(scratch), label, i,
0872                 ehci_readl(ehci,
0873                     &ehci->regs->port_status[i - 1]));
0874         temp = scnprintf(next, size, fmt, temp, scratch);
0875         size -= temp;
0876         next += temp;
0877         if (i == HCS_DEBUG_PORT(ehci->hcs_params) && ehci->debug) {
0878             temp = scnprintf(next, size,
0879                     "    debug control %08x\n",
0880                     ehci_readl(ehci,
0881                         &ehci->debug->control));
0882             size -= temp;
0883             next += temp;
0884         }
0885     }
0886 
0887     if (!list_empty(&ehci->async_unlink)) {
0888         temp = scnprintf(next, size, "async unlink qh %p\n",
0889                 list_first_entry(&ehci->async_unlink,
0890                         struct ehci_qh, unlink_node));
0891         size -= temp;
0892         next += temp;
0893     }
0894 
0895 #ifdef EHCI_STATS
0896     temp = scnprintf(next, size,
0897         "irq normal %ld err %ld iaa %ld (lost %ld)\n",
0898         ehci->stats.normal, ehci->stats.error, ehci->stats.iaa,
0899         ehci->stats.lost_iaa);
0900     size -= temp;
0901     next += temp;
0902 
0903     temp = scnprintf(next, size, "complete %ld unlink %ld\n",
0904         ehci->stats.complete, ehci->stats.unlink);
0905     size -= temp;
0906     next += temp;
0907 #endif
0908 
0909 done:
0910     spin_unlock_irqrestore(&ehci->lock, flags);
0911 
0912     return buf->alloc_size - size;
0913 }
0914 
0915 static struct debug_buffer *alloc_buffer(struct usb_bus *bus,
0916         ssize_t (*fill_func)(struct debug_buffer *))
0917 {
0918     struct debug_buffer *buf;
0919 
0920     buf = kzalloc(sizeof(*buf), GFP_KERNEL);
0921 
0922     if (buf) {
0923         buf->bus = bus;
0924         buf->fill_func = fill_func;
0925         mutex_init(&buf->mutex);
0926         buf->alloc_size = PAGE_SIZE;
0927     }
0928 
0929     return buf;
0930 }
0931 
0932 static int fill_buffer(struct debug_buffer *buf)
0933 {
0934     int ret;
0935 
0936     if (!buf->output_buf)
0937         buf->output_buf = vmalloc(buf->alloc_size);
0938 
0939     if (!buf->output_buf) {
0940         ret = -ENOMEM;
0941         goto out;
0942     }
0943 
0944     ret = buf->fill_func(buf);
0945 
0946     if (ret >= 0) {
0947         buf->count = ret;
0948         ret = 0;
0949     }
0950 
0951 out:
0952     return ret;
0953 }
0954 
0955 static ssize_t debug_output(struct file *file, char __user *user_buf,
0956         size_t len, loff_t *offset)
0957 {
0958     struct debug_buffer *buf = file->private_data;
0959     int ret;
0960 
0961     mutex_lock(&buf->mutex);
0962     if (buf->count == 0) {
0963         ret = fill_buffer(buf);
0964         if (ret != 0) {
0965             mutex_unlock(&buf->mutex);
0966             goto out;
0967         }
0968     }
0969     mutex_unlock(&buf->mutex);
0970 
0971     ret = simple_read_from_buffer(user_buf, len, offset,
0972                       buf->output_buf, buf->count);
0973 
0974 out:
0975     return ret;
0976 }
0977 
0978 static int debug_close(struct inode *inode, struct file *file)
0979 {
0980     struct debug_buffer *buf = file->private_data;
0981 
0982     if (buf) {
0983         vfree(buf->output_buf);
0984         kfree(buf);
0985     }
0986 
0987     return 0;
0988 }
0989 
0990 static int debug_async_open(struct inode *inode, struct file *file)
0991 {
0992     file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
0993 
0994     return file->private_data ? 0 : -ENOMEM;
0995 }
0996 
0997 static int debug_bandwidth_open(struct inode *inode, struct file *file)
0998 {
0999     file->private_data = alloc_buffer(inode->i_private,
1000             fill_bandwidth_buffer);
1001 
1002     return file->private_data ? 0 : -ENOMEM;
1003 }
1004 
1005 static int debug_periodic_open(struct inode *inode, struct file *file)
1006 {
1007     struct debug_buffer *buf;
1008 
1009     buf = alloc_buffer(inode->i_private, fill_periodic_buffer);
1010     if (!buf)
1011         return -ENOMEM;
1012 
1013     buf->alloc_size = (sizeof(void *) == 4 ? 6 : 8) * PAGE_SIZE;
1014     file->private_data = buf;
1015     return 0;
1016 }
1017 
1018 static int debug_registers_open(struct inode *inode, struct file *file)
1019 {
1020     file->private_data = alloc_buffer(inode->i_private,
1021                       fill_registers_buffer);
1022 
1023     return file->private_data ? 0 : -ENOMEM;
1024 }
1025 
1026 static inline void create_debug_files(struct ehci_hcd *ehci)
1027 {
1028     struct usb_bus *bus = &ehci_to_hcd(ehci)->self;
1029 
1030     ehci->debug_dir = debugfs_create_dir(bus->bus_name, ehci_debug_root);
1031 
1032     debugfs_create_file("async", S_IRUGO, ehci->debug_dir, bus,
1033                 &debug_async_fops);
1034     debugfs_create_file("bandwidth", S_IRUGO, ehci->debug_dir, bus,
1035                 &debug_bandwidth_fops);
1036     debugfs_create_file("periodic", S_IRUGO, ehci->debug_dir, bus,
1037                 &debug_periodic_fops);
1038     debugfs_create_file("registers", S_IRUGO, ehci->debug_dir, bus,
1039                 &debug_registers_fops);
1040 }
1041 
1042 static inline void remove_debug_files(struct ehci_hcd *ehci)
1043 {
1044     debugfs_remove_recursive(ehci->debug_dir);
1045 }
1046 
1047 #else /* CONFIG_DYNAMIC_DEBUG */
1048 
1049 static inline void dbg_hcs_params(struct ehci_hcd *ehci, char *label) { }
1050 static inline void dbg_hcc_params(struct ehci_hcd *ehci, char *label) { }
1051 
1052 static inline void __maybe_unused dbg_qh(const char *label,
1053         struct ehci_hcd *ehci, struct ehci_qh *qh) { }
1054 
1055 static inline int __maybe_unused dbg_status_buf(const char *buf,
1056         unsigned int len, const char *label, u32 status)
1057 { return 0; }
1058 
1059 static inline int __maybe_unused dbg_command_buf(const char *buf,
1060         unsigned int len, const char *label, u32 command)
1061 { return 0; }
1062 
1063 static inline int __maybe_unused dbg_intr_buf(const char *buf,
1064         unsigned int len, const char *label, u32 enable)
1065 { return 0; }
1066 
1067 static inline int __maybe_unused dbg_port_buf(char *buf,
1068         unsigned int len, const char *label, int port, u32 status)
1069 { return 0; }
1070 
1071 static inline void dbg_status(struct ehci_hcd *ehci, const char *label,
1072         u32 status) { }
1073 static inline void dbg_cmd(struct ehci_hcd *ehci, const char *label,
1074         u32 command) { }
1075 static inline void dbg_port(struct ehci_hcd *ehci, const char *label,
1076         int port, u32 status) { }
1077 
1078 static inline void create_debug_files(struct ehci_hcd *bus) { }
1079 static inline void remove_debug_files(struct ehci_hcd *bus) { }
1080 
1081 #endif /* CONFIG_DYNAMIC_DEBUG */
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