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0001 // SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
0002 /*
0003  * Copyright(c) 2015-2018 Intel Corporation.
0004  */
0005 
0006 #include <linux/debugfs.h>
0007 #include <linux/seq_file.h>
0008 #include <linux/kernel.h>
0009 #include <linux/export.h>
0010 #include <linux/string.h>
0011 #include <linux/types.h>
0012 #include <linux/ratelimit.h>
0013 #include <linux/fault-inject.h>
0014 
0015 #include "hfi.h"
0016 #include "trace.h"
0017 #include "debugfs.h"
0018 #include "device.h"
0019 #include "qp.h"
0020 #include "sdma.h"
0021 #include "fault.h"
0022 
0023 static struct dentry *hfi1_dbg_root;
0024 
0025 /* wrappers to enforce srcu in seq file */
0026 ssize_t hfi1_seq_read(struct file *file, char __user *buf, size_t size,
0027               loff_t *ppos)
0028 {
0029     struct dentry *d = file->f_path.dentry;
0030     ssize_t r;
0031 
0032     r = debugfs_file_get(d);
0033     if (unlikely(r))
0034         return r;
0035     r = seq_read(file, buf, size, ppos);
0036     debugfs_file_put(d);
0037     return r;
0038 }
0039 
0040 loff_t hfi1_seq_lseek(struct file *file, loff_t offset, int whence)
0041 {
0042     struct dentry *d = file->f_path.dentry;
0043     loff_t r;
0044 
0045     r = debugfs_file_get(d);
0046     if (unlikely(r))
0047         return r;
0048     r = seq_lseek(file, offset, whence);
0049     debugfs_file_put(d);
0050     return r;
0051 }
0052 
0053 #define private2dd(file) (file_inode(file)->i_private)
0054 #define private2ppd(file) (file_inode(file)->i_private)
0055 
0056 static void *_opcode_stats_seq_start(struct seq_file *s, loff_t *pos)
0057 {
0058     struct hfi1_opcode_stats_perctx *opstats;
0059 
0060     if (*pos >= ARRAY_SIZE(opstats->stats))
0061         return NULL;
0062     return pos;
0063 }
0064 
0065 static void *_opcode_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
0066 {
0067     struct hfi1_opcode_stats_perctx *opstats;
0068 
0069     ++*pos;
0070     if (*pos >= ARRAY_SIZE(opstats->stats))
0071         return NULL;
0072     return pos;
0073 }
0074 
0075 static void _opcode_stats_seq_stop(struct seq_file *s, void *v)
0076 {
0077 }
0078 
0079 static int opcode_stats_show(struct seq_file *s, u8 i, u64 packets, u64 bytes)
0080 {
0081     if (!packets && !bytes)
0082         return SEQ_SKIP;
0083     seq_printf(s, "%02x %llu/%llu\n", i,
0084            (unsigned long long)packets,
0085            (unsigned long long)bytes);
0086 
0087     return 0;
0088 }
0089 
0090 static int _opcode_stats_seq_show(struct seq_file *s, void *v)
0091 {
0092     loff_t *spos = v;
0093     loff_t i = *spos, j;
0094     u64 n_packets = 0, n_bytes = 0;
0095     struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
0096     struct hfi1_devdata *dd = dd_from_dev(ibd);
0097     struct hfi1_ctxtdata *rcd;
0098 
0099     for (j = 0; j < dd->first_dyn_alloc_ctxt; j++) {
0100         rcd = hfi1_rcd_get_by_index(dd, j);
0101         if (rcd) {
0102             n_packets += rcd->opstats->stats[i].n_packets;
0103             n_bytes += rcd->opstats->stats[i].n_bytes;
0104         }
0105         hfi1_rcd_put(rcd);
0106     }
0107     return opcode_stats_show(s, i, n_packets, n_bytes);
0108 }
0109 
0110 DEBUGFS_SEQ_FILE_OPS(opcode_stats);
0111 DEBUGFS_SEQ_FILE_OPEN(opcode_stats)
0112 DEBUGFS_FILE_OPS(opcode_stats);
0113 
0114 static void *_tx_opcode_stats_seq_start(struct seq_file *s, loff_t *pos)
0115 {
0116     return _opcode_stats_seq_start(s, pos);
0117 }
0118 
0119 static void *_tx_opcode_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
0120 {
0121     return _opcode_stats_seq_next(s, v, pos);
0122 }
0123 
0124 static void _tx_opcode_stats_seq_stop(struct seq_file *s, void *v)
0125 {
0126 }
0127 
0128 static int _tx_opcode_stats_seq_show(struct seq_file *s, void *v)
0129 {
0130     loff_t *spos = v;
0131     loff_t i = *spos;
0132     int j;
0133     u64 n_packets = 0, n_bytes = 0;
0134     struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
0135     struct hfi1_devdata *dd = dd_from_dev(ibd);
0136 
0137     for_each_possible_cpu(j) {
0138         struct hfi1_opcode_stats_perctx *s =
0139             per_cpu_ptr(dd->tx_opstats, j);
0140         n_packets += s->stats[i].n_packets;
0141         n_bytes += s->stats[i].n_bytes;
0142     }
0143     return opcode_stats_show(s, i, n_packets, n_bytes);
0144 }
0145 
0146 DEBUGFS_SEQ_FILE_OPS(tx_opcode_stats);
0147 DEBUGFS_SEQ_FILE_OPEN(tx_opcode_stats)
0148 DEBUGFS_FILE_OPS(tx_opcode_stats);
0149 
0150 static void *_ctx_stats_seq_start(struct seq_file *s, loff_t *pos)
0151 {
0152     struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
0153     struct hfi1_devdata *dd = dd_from_dev(ibd);
0154 
0155     if (!*pos)
0156         return SEQ_START_TOKEN;
0157     if (*pos >= dd->first_dyn_alloc_ctxt)
0158         return NULL;
0159     return pos;
0160 }
0161 
0162 static void *_ctx_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
0163 {
0164     struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
0165     struct hfi1_devdata *dd = dd_from_dev(ibd);
0166 
0167     if (v == SEQ_START_TOKEN)
0168         return pos;
0169 
0170     ++*pos;
0171     if (*pos >= dd->first_dyn_alloc_ctxt)
0172         return NULL;
0173     return pos;
0174 }
0175 
0176 static void _ctx_stats_seq_stop(struct seq_file *s, void *v)
0177 {
0178     /* nothing allocated */
0179 }
0180 
0181 static int _ctx_stats_seq_show(struct seq_file *s, void *v)
0182 {
0183     loff_t *spos;
0184     loff_t i, j;
0185     u64 n_packets = 0;
0186     struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
0187     struct hfi1_devdata *dd = dd_from_dev(ibd);
0188     struct hfi1_ctxtdata *rcd;
0189 
0190     if (v == SEQ_START_TOKEN) {
0191         seq_puts(s, "Ctx:npkts\n");
0192         return 0;
0193     }
0194 
0195     spos = v;
0196     i = *spos;
0197 
0198     rcd = hfi1_rcd_get_by_index_safe(dd, i);
0199     if (!rcd)
0200         return SEQ_SKIP;
0201 
0202     for (j = 0; j < ARRAY_SIZE(rcd->opstats->stats); j++)
0203         n_packets += rcd->opstats->stats[j].n_packets;
0204 
0205     hfi1_rcd_put(rcd);
0206 
0207     if (!n_packets)
0208         return SEQ_SKIP;
0209 
0210     seq_printf(s, "  %llu:%llu\n", i, n_packets);
0211     return 0;
0212 }
0213 
0214 DEBUGFS_SEQ_FILE_OPS(ctx_stats);
0215 DEBUGFS_SEQ_FILE_OPEN(ctx_stats)
0216 DEBUGFS_FILE_OPS(ctx_stats);
0217 
0218 static void *_qp_stats_seq_start(struct seq_file *s, loff_t *pos)
0219     __acquires(RCU)
0220 {
0221     struct rvt_qp_iter *iter;
0222     loff_t n = *pos;
0223 
0224     iter = rvt_qp_iter_init(s->private, 0, NULL);
0225 
0226     /* stop calls rcu_read_unlock */
0227     rcu_read_lock();
0228 
0229     if (!iter)
0230         return NULL;
0231 
0232     do {
0233         if (rvt_qp_iter_next(iter)) {
0234             kfree(iter);
0235             return NULL;
0236         }
0237     } while (n--);
0238 
0239     return iter;
0240 }
0241 
0242 static void *_qp_stats_seq_next(struct seq_file *s, void *iter_ptr,
0243                 loff_t *pos)
0244     __must_hold(RCU)
0245 {
0246     struct rvt_qp_iter *iter = iter_ptr;
0247 
0248     (*pos)++;
0249 
0250     if (rvt_qp_iter_next(iter)) {
0251         kfree(iter);
0252         return NULL;
0253     }
0254 
0255     return iter;
0256 }
0257 
0258 static void _qp_stats_seq_stop(struct seq_file *s, void *iter_ptr)
0259     __releases(RCU)
0260 {
0261     rcu_read_unlock();
0262 }
0263 
0264 static int _qp_stats_seq_show(struct seq_file *s, void *iter_ptr)
0265 {
0266     struct rvt_qp_iter *iter = iter_ptr;
0267 
0268     if (!iter)
0269         return 0;
0270 
0271     qp_iter_print(s, iter);
0272 
0273     return 0;
0274 }
0275 
0276 DEBUGFS_SEQ_FILE_OPS(qp_stats);
0277 DEBUGFS_SEQ_FILE_OPEN(qp_stats)
0278 DEBUGFS_FILE_OPS(qp_stats);
0279 
0280 static void *_sdes_seq_start(struct seq_file *s, loff_t *pos)
0281 {
0282     struct hfi1_ibdev *ibd;
0283     struct hfi1_devdata *dd;
0284 
0285     ibd = (struct hfi1_ibdev *)s->private;
0286     dd = dd_from_dev(ibd);
0287     if (!dd->per_sdma || *pos >= dd->num_sdma)
0288         return NULL;
0289     return pos;
0290 }
0291 
0292 static void *_sdes_seq_next(struct seq_file *s, void *v, loff_t *pos)
0293 {
0294     struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
0295     struct hfi1_devdata *dd = dd_from_dev(ibd);
0296 
0297     ++*pos;
0298     if (!dd->per_sdma || *pos >= dd->num_sdma)
0299         return NULL;
0300     return pos;
0301 }
0302 
0303 static void _sdes_seq_stop(struct seq_file *s, void *v)
0304 {
0305 }
0306 
0307 static int _sdes_seq_show(struct seq_file *s, void *v)
0308 {
0309     struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
0310     struct hfi1_devdata *dd = dd_from_dev(ibd);
0311     loff_t *spos = v;
0312     loff_t i = *spos;
0313 
0314     sdma_seqfile_dump_sde(s, &dd->per_sdma[i]);
0315     return 0;
0316 }
0317 
0318 DEBUGFS_SEQ_FILE_OPS(sdes);
0319 DEBUGFS_SEQ_FILE_OPEN(sdes)
0320 DEBUGFS_FILE_OPS(sdes);
0321 
0322 static void *_rcds_seq_start(struct seq_file *s, loff_t *pos)
0323 {
0324     struct hfi1_ibdev *ibd;
0325     struct hfi1_devdata *dd;
0326 
0327     ibd = (struct hfi1_ibdev *)s->private;
0328     dd = dd_from_dev(ibd);
0329     if (!dd->rcd || *pos >= dd->n_krcv_queues)
0330         return NULL;
0331     return pos;
0332 }
0333 
0334 static void *_rcds_seq_next(struct seq_file *s, void *v, loff_t *pos)
0335 {
0336     struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
0337     struct hfi1_devdata *dd = dd_from_dev(ibd);
0338 
0339     ++*pos;
0340     if (!dd->rcd || *pos >= dd->num_rcv_contexts)
0341         return NULL;
0342     return pos;
0343 }
0344 
0345 static void _rcds_seq_stop(struct seq_file *s, void *v)
0346 {
0347 }
0348 
0349 static int _rcds_seq_show(struct seq_file *s, void *v)
0350 {
0351     struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
0352     struct hfi1_devdata *dd = dd_from_dev(ibd);
0353     struct hfi1_ctxtdata *rcd;
0354     loff_t *spos = v;
0355     loff_t i = *spos;
0356 
0357     rcd = hfi1_rcd_get_by_index_safe(dd, i);
0358     if (rcd)
0359         seqfile_dump_rcd(s, rcd);
0360     hfi1_rcd_put(rcd);
0361     return 0;
0362 }
0363 
0364 DEBUGFS_SEQ_FILE_OPS(rcds);
0365 DEBUGFS_SEQ_FILE_OPEN(rcds)
0366 DEBUGFS_FILE_OPS(rcds);
0367 
0368 static void *_pios_seq_start(struct seq_file *s, loff_t *pos)
0369 {
0370     struct hfi1_ibdev *ibd;
0371     struct hfi1_devdata *dd;
0372 
0373     ibd = (struct hfi1_ibdev *)s->private;
0374     dd = dd_from_dev(ibd);
0375     if (!dd->send_contexts || *pos >= dd->num_send_contexts)
0376         return NULL;
0377     return pos;
0378 }
0379 
0380 static void *_pios_seq_next(struct seq_file *s, void *v, loff_t *pos)
0381 {
0382     struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
0383     struct hfi1_devdata *dd = dd_from_dev(ibd);
0384 
0385     ++*pos;
0386     if (!dd->send_contexts || *pos >= dd->num_send_contexts)
0387         return NULL;
0388     return pos;
0389 }
0390 
0391 static void _pios_seq_stop(struct seq_file *s, void *v)
0392 {
0393 }
0394 
0395 static int _pios_seq_show(struct seq_file *s, void *v)
0396 {
0397     struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
0398     struct hfi1_devdata *dd = dd_from_dev(ibd);
0399     struct send_context_info *sci;
0400     loff_t *spos = v;
0401     loff_t i = *spos;
0402     unsigned long flags;
0403 
0404     spin_lock_irqsave(&dd->sc_lock, flags);
0405     sci = &dd->send_contexts[i];
0406     if (sci && sci->type != SC_USER && sci->allocated && sci->sc)
0407         seqfile_dump_sci(s, i, sci);
0408     spin_unlock_irqrestore(&dd->sc_lock, flags);
0409     return 0;
0410 }
0411 
0412 DEBUGFS_SEQ_FILE_OPS(pios);
0413 DEBUGFS_SEQ_FILE_OPEN(pios)
0414 DEBUGFS_FILE_OPS(pios);
0415 
0416 /* read the per-device counters */
0417 static ssize_t dev_counters_read(struct file *file, char __user *buf,
0418                  size_t count, loff_t *ppos)
0419 {
0420     u64 *counters;
0421     size_t avail;
0422     struct hfi1_devdata *dd;
0423     ssize_t rval;
0424 
0425     dd = private2dd(file);
0426     avail = hfi1_read_cntrs(dd, NULL, &counters);
0427     rval =  simple_read_from_buffer(buf, count, ppos, counters, avail);
0428     return rval;
0429 }
0430 
0431 /* read the per-device counters */
0432 static ssize_t dev_names_read(struct file *file, char __user *buf,
0433                   size_t count, loff_t *ppos)
0434 {
0435     char *names;
0436     size_t avail;
0437     struct hfi1_devdata *dd;
0438     ssize_t rval;
0439 
0440     dd = private2dd(file);
0441     avail = hfi1_read_cntrs(dd, &names, NULL);
0442     rval =  simple_read_from_buffer(buf, count, ppos, names, avail);
0443     return rval;
0444 }
0445 
0446 struct counter_info {
0447     char *name;
0448     const struct file_operations ops;
0449 };
0450 
0451 /*
0452  * Could use file_inode(file)->i_ino to figure out which file,
0453  * instead of separate routine for each, but for now, this works...
0454  */
0455 
0456 /* read the per-port names (same for each port) */
0457 static ssize_t portnames_read(struct file *file, char __user *buf,
0458                   size_t count, loff_t *ppos)
0459 {
0460     char *names;
0461     size_t avail;
0462     struct hfi1_devdata *dd;
0463     ssize_t rval;
0464 
0465     dd = private2dd(file);
0466     avail = hfi1_read_portcntrs(dd->pport, &names, NULL);
0467     rval = simple_read_from_buffer(buf, count, ppos, names, avail);
0468     return rval;
0469 }
0470 
0471 /* read the per-port counters */
0472 static ssize_t portcntrs_debugfs_read(struct file *file, char __user *buf,
0473                       size_t count, loff_t *ppos)
0474 {
0475     u64 *counters;
0476     size_t avail;
0477     struct hfi1_pportdata *ppd;
0478     ssize_t rval;
0479 
0480     ppd = private2ppd(file);
0481     avail = hfi1_read_portcntrs(ppd, NULL, &counters);
0482     rval = simple_read_from_buffer(buf, count, ppos, counters, avail);
0483     return rval;
0484 }
0485 
0486 static void check_dyn_flag(u64 scratch0, char *p, int size, int *used,
0487                int this_hfi, int hfi, u32 flag, const char *what)
0488 {
0489     u32 mask;
0490 
0491     mask = flag << (hfi ? CR_DYN_SHIFT : 0);
0492     if (scratch0 & mask) {
0493         *used += scnprintf(p + *used, size - *used,
0494                    "  0x%08x - HFI%d %s in use, %s device\n",
0495                    mask, hfi, what,
0496                    this_hfi == hfi ? "this" : "other");
0497     }
0498 }
0499 
0500 static ssize_t asic_flags_read(struct file *file, char __user *buf,
0501                    size_t count, loff_t *ppos)
0502 {
0503     struct hfi1_pportdata *ppd;
0504     struct hfi1_devdata *dd;
0505     u64 scratch0;
0506     char *tmp;
0507     int ret = 0;
0508     int size;
0509     int used;
0510     int i;
0511 
0512     ppd = private2ppd(file);
0513     dd = ppd->dd;
0514     size = PAGE_SIZE;
0515     used = 0;
0516     tmp = kmalloc(size, GFP_KERNEL);
0517     if (!tmp)
0518         return -ENOMEM;
0519 
0520     scratch0 = read_csr(dd, ASIC_CFG_SCRATCH);
0521     used += scnprintf(tmp + used, size - used,
0522               "Resource flags: 0x%016llx\n", scratch0);
0523 
0524     /* check permanent flag */
0525     if (scratch0 & CR_THERM_INIT) {
0526         used += scnprintf(tmp + used, size - used,
0527                   "  0x%08x - thermal monitoring initialized\n",
0528                   (u32)CR_THERM_INIT);
0529     }
0530 
0531     /* check each dynamic flag on each HFI */
0532     for (i = 0; i < 2; i++) {
0533         check_dyn_flag(scratch0, tmp, size, &used, dd->hfi1_id, i,
0534                    CR_SBUS, "SBus");
0535         check_dyn_flag(scratch0, tmp, size, &used, dd->hfi1_id, i,
0536                    CR_EPROM, "EPROM");
0537         check_dyn_flag(scratch0, tmp, size, &used, dd->hfi1_id, i,
0538                    CR_I2C1, "i2c chain 1");
0539         check_dyn_flag(scratch0, tmp, size, &used, dd->hfi1_id, i,
0540                    CR_I2C2, "i2c chain 2");
0541     }
0542     used += scnprintf(tmp + used, size - used, "Write bits to clear\n");
0543 
0544     ret = simple_read_from_buffer(buf, count, ppos, tmp, used);
0545     kfree(tmp);
0546     return ret;
0547 }
0548 
0549 static ssize_t asic_flags_write(struct file *file, const char __user *buf,
0550                 size_t count, loff_t *ppos)
0551 {
0552     struct hfi1_pportdata *ppd;
0553     struct hfi1_devdata *dd;
0554     char *buff;
0555     int ret;
0556     unsigned long long value;
0557     u64 scratch0;
0558     u64 clear;
0559 
0560     ppd = private2ppd(file);
0561     dd = ppd->dd;
0562 
0563     /* zero terminate and read the expected integer */
0564     buff = memdup_user_nul(buf, count);
0565     if (IS_ERR(buff))
0566         return PTR_ERR(buff);
0567 
0568     ret = kstrtoull(buff, 0, &value);
0569     if (ret)
0570         goto do_free;
0571     clear = value;
0572 
0573     /* obtain exclusive access */
0574     mutex_lock(&dd->asic_data->asic_resource_mutex);
0575     acquire_hw_mutex(dd);
0576 
0577     scratch0 = read_csr(dd, ASIC_CFG_SCRATCH);
0578     scratch0 &= ~clear;
0579     write_csr(dd, ASIC_CFG_SCRATCH, scratch0);
0580     /* force write to be visible to other HFI on another OS */
0581     (void)read_csr(dd, ASIC_CFG_SCRATCH);
0582 
0583     release_hw_mutex(dd);
0584     mutex_unlock(&dd->asic_data->asic_resource_mutex);
0585 
0586     /* return the number of bytes written */
0587     ret = count;
0588 
0589  do_free:
0590     kfree(buff);
0591     return ret;
0592 }
0593 
0594 /* read the dc8051 memory */
0595 static ssize_t dc8051_memory_read(struct file *file, char __user *buf,
0596                   size_t count, loff_t *ppos)
0597 {
0598     struct hfi1_pportdata *ppd = private2ppd(file);
0599     ssize_t rval;
0600     void *tmp;
0601     loff_t start, end;
0602 
0603     /* the checks below expect the position to be positive */
0604     if (*ppos < 0)
0605         return -EINVAL;
0606 
0607     tmp = kzalloc(DC8051_DATA_MEM_SIZE, GFP_KERNEL);
0608     if (!tmp)
0609         return -ENOMEM;
0610 
0611     /*
0612      * Fill in the requested portion of the temporary buffer from the
0613      * 8051 memory.  The 8051 memory read is done in terms of 8 bytes.
0614      * Adjust start and end to fit.  Skip reading anything if out of
0615      * range.
0616      */
0617     start = *ppos & ~0x7;   /* round down */
0618     if (start < DC8051_DATA_MEM_SIZE) {
0619         end = (*ppos + count + 7) & ~0x7; /* round up */
0620         if (end > DC8051_DATA_MEM_SIZE)
0621             end = DC8051_DATA_MEM_SIZE;
0622         rval = read_8051_data(ppd->dd, start, end - start,
0623                       (u64 *)(tmp + start));
0624         if (rval)
0625             goto done;
0626     }
0627 
0628     rval = simple_read_from_buffer(buf, count, ppos, tmp,
0629                        DC8051_DATA_MEM_SIZE);
0630 done:
0631     kfree(tmp);
0632     return rval;
0633 }
0634 
0635 static ssize_t debugfs_lcb_read(struct file *file, char __user *buf,
0636                 size_t count, loff_t *ppos)
0637 {
0638     struct hfi1_pportdata *ppd = private2ppd(file);
0639     struct hfi1_devdata *dd = ppd->dd;
0640     unsigned long total, csr_off;
0641     u64 data;
0642 
0643     if (*ppos < 0)
0644         return -EINVAL;
0645     /* only read 8 byte quantities */
0646     if ((count % 8) != 0)
0647         return -EINVAL;
0648     /* offset must be 8-byte aligned */
0649     if ((*ppos % 8) != 0)
0650         return -EINVAL;
0651     /* do nothing if out of range or zero count */
0652     if (*ppos >= (LCB_END - LCB_START) || !count)
0653         return 0;
0654     /* reduce count if needed */
0655     if (*ppos + count > LCB_END - LCB_START)
0656         count = (LCB_END - LCB_START) - *ppos;
0657 
0658     csr_off = LCB_START + *ppos;
0659     for (total = 0; total < count; total += 8, csr_off += 8) {
0660         if (read_lcb_csr(dd, csr_off, (u64 *)&data))
0661             break; /* failed */
0662         if (put_user(data, (unsigned long __user *)(buf + total)))
0663             break;
0664     }
0665     *ppos += total;
0666     return total;
0667 }
0668 
0669 static ssize_t debugfs_lcb_write(struct file *file, const char __user *buf,
0670                  size_t count, loff_t *ppos)
0671 {
0672     struct hfi1_pportdata *ppd = private2ppd(file);
0673     struct hfi1_devdata *dd = ppd->dd;
0674     unsigned long total, csr_off, data;
0675 
0676     if (*ppos < 0)
0677         return -EINVAL;
0678     /* only write 8 byte quantities */
0679     if ((count % 8) != 0)
0680         return -EINVAL;
0681     /* offset must be 8-byte aligned */
0682     if ((*ppos % 8) != 0)
0683         return -EINVAL;
0684     /* do nothing if out of range or zero count */
0685     if (*ppos >= (LCB_END - LCB_START) || !count)
0686         return 0;
0687     /* reduce count if needed */
0688     if (*ppos + count > LCB_END - LCB_START)
0689         count = (LCB_END - LCB_START) - *ppos;
0690 
0691     csr_off = LCB_START + *ppos;
0692     for (total = 0; total < count; total += 8, csr_off += 8) {
0693         if (get_user(data, (unsigned long __user *)(buf + total)))
0694             break;
0695         if (write_lcb_csr(dd, csr_off, data))
0696             break; /* failed */
0697     }
0698     *ppos += total;
0699     return total;
0700 }
0701 
0702 /*
0703  * read the per-port QSFP data for ppd
0704  */
0705 static ssize_t qsfp_debugfs_dump(struct file *file, char __user *buf,
0706                  size_t count, loff_t *ppos)
0707 {
0708     struct hfi1_pportdata *ppd;
0709     char *tmp;
0710     int ret;
0711 
0712     ppd = private2ppd(file);
0713     tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
0714     if (!tmp)
0715         return -ENOMEM;
0716 
0717     ret = qsfp_dump(ppd, tmp, PAGE_SIZE);
0718     if (ret > 0)
0719         ret = simple_read_from_buffer(buf, count, ppos, tmp, ret);
0720     kfree(tmp);
0721     return ret;
0722 }
0723 
0724 /* Do an i2c write operation on the chain for the given HFI. */
0725 static ssize_t __i2c_debugfs_write(struct file *file, const char __user *buf,
0726                    size_t count, loff_t *ppos, u32 target)
0727 {
0728     struct hfi1_pportdata *ppd;
0729     char *buff;
0730     int ret;
0731     int i2c_addr;
0732     int offset;
0733     int total_written;
0734 
0735     ppd = private2ppd(file);
0736 
0737     /* byte offset format: [offsetSize][i2cAddr][offsetHigh][offsetLow] */
0738     i2c_addr = (*ppos >> 16) & 0xffff;
0739     offset = *ppos & 0xffff;
0740 
0741     /* explicitly reject invalid address 0 to catch cp and cat */
0742     if (i2c_addr == 0)
0743         return -EINVAL;
0744 
0745     buff = memdup_user(buf, count);
0746     if (IS_ERR(buff))
0747         return PTR_ERR(buff);
0748 
0749     total_written = i2c_write(ppd, target, i2c_addr, offset, buff, count);
0750     if (total_written < 0) {
0751         ret = total_written;
0752         goto _free;
0753     }
0754 
0755     *ppos += total_written;
0756 
0757     ret = total_written;
0758 
0759  _free:
0760     kfree(buff);
0761     return ret;
0762 }
0763 
0764 /* Do an i2c write operation on chain for HFI 0. */
0765 static ssize_t i2c1_debugfs_write(struct file *file, const char __user *buf,
0766                   size_t count, loff_t *ppos)
0767 {
0768     return __i2c_debugfs_write(file, buf, count, ppos, 0);
0769 }
0770 
0771 /* Do an i2c write operation on chain for HFI 1. */
0772 static ssize_t i2c2_debugfs_write(struct file *file, const char __user *buf,
0773                   size_t count, loff_t *ppos)
0774 {
0775     return __i2c_debugfs_write(file, buf, count, ppos, 1);
0776 }
0777 
0778 /* Do an i2c read operation on the chain for the given HFI. */
0779 static ssize_t __i2c_debugfs_read(struct file *file, char __user *buf,
0780                   size_t count, loff_t *ppos, u32 target)
0781 {
0782     struct hfi1_pportdata *ppd;
0783     char *buff;
0784     int ret;
0785     int i2c_addr;
0786     int offset;
0787     int total_read;
0788 
0789     ppd = private2ppd(file);
0790 
0791     /* byte offset format: [offsetSize][i2cAddr][offsetHigh][offsetLow] */
0792     i2c_addr = (*ppos >> 16) & 0xffff;
0793     offset = *ppos & 0xffff;
0794 
0795     /* explicitly reject invalid address 0 to catch cp and cat */
0796     if (i2c_addr == 0)
0797         return -EINVAL;
0798 
0799     buff = kmalloc(count, GFP_KERNEL);
0800     if (!buff)
0801         return -ENOMEM;
0802 
0803     total_read = i2c_read(ppd, target, i2c_addr, offset, buff, count);
0804     if (total_read < 0) {
0805         ret = total_read;
0806         goto _free;
0807     }
0808 
0809     *ppos += total_read;
0810 
0811     ret = copy_to_user(buf, buff, total_read);
0812     if (ret > 0) {
0813         ret = -EFAULT;
0814         goto _free;
0815     }
0816 
0817     ret = total_read;
0818 
0819  _free:
0820     kfree(buff);
0821     return ret;
0822 }
0823 
0824 /* Do an i2c read operation on chain for HFI 0. */
0825 static ssize_t i2c1_debugfs_read(struct file *file, char __user *buf,
0826                  size_t count, loff_t *ppos)
0827 {
0828     return __i2c_debugfs_read(file, buf, count, ppos, 0);
0829 }
0830 
0831 /* Do an i2c read operation on chain for HFI 1. */
0832 static ssize_t i2c2_debugfs_read(struct file *file, char __user *buf,
0833                  size_t count, loff_t *ppos)
0834 {
0835     return __i2c_debugfs_read(file, buf, count, ppos, 1);
0836 }
0837 
0838 /* Do a QSFP write operation on the i2c chain for the given HFI. */
0839 static ssize_t __qsfp_debugfs_write(struct file *file, const char __user *buf,
0840                     size_t count, loff_t *ppos, u32 target)
0841 {
0842     struct hfi1_pportdata *ppd;
0843     char *buff;
0844     int ret;
0845     int total_written;
0846 
0847     if (*ppos + count > QSFP_PAGESIZE * 4) /* base page + page00-page03 */
0848         return -EINVAL;
0849 
0850     ppd = private2ppd(file);
0851 
0852     buff = memdup_user(buf, count);
0853     if (IS_ERR(buff))
0854         return PTR_ERR(buff);
0855 
0856     total_written = qsfp_write(ppd, target, *ppos, buff, count);
0857     if (total_written < 0) {
0858         ret = total_written;
0859         goto _free;
0860     }
0861 
0862     *ppos += total_written;
0863 
0864     ret = total_written;
0865 
0866  _free:
0867     kfree(buff);
0868     return ret;
0869 }
0870 
0871 /* Do a QSFP write operation on i2c chain for HFI 0. */
0872 static ssize_t qsfp1_debugfs_write(struct file *file, const char __user *buf,
0873                    size_t count, loff_t *ppos)
0874 {
0875     return __qsfp_debugfs_write(file, buf, count, ppos, 0);
0876 }
0877 
0878 /* Do a QSFP write operation on i2c chain for HFI 1. */
0879 static ssize_t qsfp2_debugfs_write(struct file *file, const char __user *buf,
0880                    size_t count, loff_t *ppos)
0881 {
0882     return __qsfp_debugfs_write(file, buf, count, ppos, 1);
0883 }
0884 
0885 /* Do a QSFP read operation on the i2c chain for the given HFI. */
0886 static ssize_t __qsfp_debugfs_read(struct file *file, char __user *buf,
0887                    size_t count, loff_t *ppos, u32 target)
0888 {
0889     struct hfi1_pportdata *ppd;
0890     char *buff;
0891     int ret;
0892     int total_read;
0893 
0894     if (*ppos + count > QSFP_PAGESIZE * 4) { /* base page + page00-page03 */
0895         ret = -EINVAL;
0896         goto _return;
0897     }
0898 
0899     ppd = private2ppd(file);
0900 
0901     buff = kmalloc(count, GFP_KERNEL);
0902     if (!buff) {
0903         ret = -ENOMEM;
0904         goto _return;
0905     }
0906 
0907     total_read = qsfp_read(ppd, target, *ppos, buff, count);
0908     if (total_read < 0) {
0909         ret = total_read;
0910         goto _free;
0911     }
0912 
0913     *ppos += total_read;
0914 
0915     ret = copy_to_user(buf, buff, total_read);
0916     if (ret > 0) {
0917         ret = -EFAULT;
0918         goto _free;
0919     }
0920 
0921     ret = total_read;
0922 
0923  _free:
0924     kfree(buff);
0925  _return:
0926     return ret;
0927 }
0928 
0929 /* Do a QSFP read operation on i2c chain for HFI 0. */
0930 static ssize_t qsfp1_debugfs_read(struct file *file, char __user *buf,
0931                   size_t count, loff_t *ppos)
0932 {
0933     return __qsfp_debugfs_read(file, buf, count, ppos, 0);
0934 }
0935 
0936 /* Do a QSFP read operation on i2c chain for HFI 1. */
0937 static ssize_t qsfp2_debugfs_read(struct file *file, char __user *buf,
0938                   size_t count, loff_t *ppos)
0939 {
0940     return __qsfp_debugfs_read(file, buf, count, ppos, 1);
0941 }
0942 
0943 static int __i2c_debugfs_open(struct inode *in, struct file *fp, u32 target)
0944 {
0945     struct hfi1_pportdata *ppd;
0946 
0947     ppd = private2ppd(fp);
0948 
0949     return acquire_chip_resource(ppd->dd, i2c_target(target), 0);
0950 }
0951 
0952 static int i2c1_debugfs_open(struct inode *in, struct file *fp)
0953 {
0954     return __i2c_debugfs_open(in, fp, 0);
0955 }
0956 
0957 static int i2c2_debugfs_open(struct inode *in, struct file *fp)
0958 {
0959     return __i2c_debugfs_open(in, fp, 1);
0960 }
0961 
0962 static int __i2c_debugfs_release(struct inode *in, struct file *fp, u32 target)
0963 {
0964     struct hfi1_pportdata *ppd;
0965 
0966     ppd = private2ppd(fp);
0967 
0968     release_chip_resource(ppd->dd, i2c_target(target));
0969 
0970     return 0;
0971 }
0972 
0973 static int i2c1_debugfs_release(struct inode *in, struct file *fp)
0974 {
0975     return __i2c_debugfs_release(in, fp, 0);
0976 }
0977 
0978 static int i2c2_debugfs_release(struct inode *in, struct file *fp)
0979 {
0980     return __i2c_debugfs_release(in, fp, 1);
0981 }
0982 
0983 static int __qsfp_debugfs_open(struct inode *in, struct file *fp, u32 target)
0984 {
0985     struct hfi1_pportdata *ppd;
0986 
0987     ppd = private2ppd(fp);
0988 
0989     return acquire_chip_resource(ppd->dd, i2c_target(target), 0);
0990 }
0991 
0992 static int qsfp1_debugfs_open(struct inode *in, struct file *fp)
0993 {
0994     return __qsfp_debugfs_open(in, fp, 0);
0995 }
0996 
0997 static int qsfp2_debugfs_open(struct inode *in, struct file *fp)
0998 {
0999     return __qsfp_debugfs_open(in, fp, 1);
1000 }
1001 
1002 static int __qsfp_debugfs_release(struct inode *in, struct file *fp, u32 target)
1003 {
1004     struct hfi1_pportdata *ppd;
1005 
1006     ppd = private2ppd(fp);
1007 
1008     release_chip_resource(ppd->dd, i2c_target(target));
1009 
1010     return 0;
1011 }
1012 
1013 static int qsfp1_debugfs_release(struct inode *in, struct file *fp)
1014 {
1015     return __qsfp_debugfs_release(in, fp, 0);
1016 }
1017 
1018 static int qsfp2_debugfs_release(struct inode *in, struct file *fp)
1019 {
1020     return __qsfp_debugfs_release(in, fp, 1);
1021 }
1022 
1023 #define EXPROM_WRITE_ENABLE BIT_ULL(14)
1024 
1025 static bool exprom_wp_disabled;
1026 
1027 static int exprom_wp_set(struct hfi1_devdata *dd, bool disable)
1028 {
1029     u64 gpio_val = 0;
1030 
1031     if (disable) {
1032         gpio_val = EXPROM_WRITE_ENABLE;
1033         exprom_wp_disabled = true;
1034         dd_dev_info(dd, "Disable Expansion ROM Write Protection\n");
1035     } else {
1036         exprom_wp_disabled = false;
1037         dd_dev_info(dd, "Enable Expansion ROM Write Protection\n");
1038     }
1039 
1040     write_csr(dd, ASIC_GPIO_OUT, gpio_val);
1041     write_csr(dd, ASIC_GPIO_OE, gpio_val);
1042 
1043     return 0;
1044 }
1045 
1046 static ssize_t exprom_wp_debugfs_read(struct file *file, char __user *buf,
1047                       size_t count, loff_t *ppos)
1048 {
1049     return 0;
1050 }
1051 
1052 static ssize_t exprom_wp_debugfs_write(struct file *file,
1053                        const char __user *buf, size_t count,
1054                        loff_t *ppos)
1055 {
1056     struct hfi1_pportdata *ppd = private2ppd(file);
1057     char cdata;
1058 
1059     if (count != 1)
1060         return -EINVAL;
1061     if (get_user(cdata, buf))
1062         return -EFAULT;
1063     if (cdata == '0')
1064         exprom_wp_set(ppd->dd, false);
1065     else if (cdata == '1')
1066         exprom_wp_set(ppd->dd, true);
1067     else
1068         return -EINVAL;
1069 
1070     return 1;
1071 }
1072 
1073 static unsigned long exprom_in_use;
1074 
1075 static int exprom_wp_debugfs_open(struct inode *in, struct file *fp)
1076 {
1077     if (test_and_set_bit(0, &exprom_in_use))
1078         return -EBUSY;
1079 
1080     return 0;
1081 }
1082 
1083 static int exprom_wp_debugfs_release(struct inode *in, struct file *fp)
1084 {
1085     struct hfi1_pportdata *ppd = private2ppd(fp);
1086 
1087     if (exprom_wp_disabled)
1088         exprom_wp_set(ppd->dd, false);
1089     clear_bit(0, &exprom_in_use);
1090 
1091     return 0;
1092 }
1093 
1094 #define DEBUGFS_OPS(nm, readroutine, writeroutine)  \
1095 { \
1096     .name = nm, \
1097     .ops = { \
1098         .owner = THIS_MODULE, \
1099         .read = readroutine, \
1100         .write = writeroutine, \
1101         .llseek = generic_file_llseek, \
1102     }, \
1103 }
1104 
1105 #define DEBUGFS_XOPS(nm, readf, writef, openf, releasef) \
1106 { \
1107     .name = nm, \
1108     .ops = { \
1109         .owner = THIS_MODULE, \
1110         .read = readf, \
1111         .write = writef, \
1112         .llseek = generic_file_llseek, \
1113         .open = openf, \
1114         .release = releasef \
1115     }, \
1116 }
1117 
1118 static const struct counter_info cntr_ops[] = {
1119     DEBUGFS_OPS("counter_names", dev_names_read, NULL),
1120     DEBUGFS_OPS("counters", dev_counters_read, NULL),
1121     DEBUGFS_OPS("portcounter_names", portnames_read, NULL),
1122 };
1123 
1124 static const struct counter_info port_cntr_ops[] = {
1125     DEBUGFS_OPS("port%dcounters", portcntrs_debugfs_read, NULL),
1126     DEBUGFS_XOPS("i2c1", i2c1_debugfs_read, i2c1_debugfs_write,
1127              i2c1_debugfs_open, i2c1_debugfs_release),
1128     DEBUGFS_XOPS("i2c2", i2c2_debugfs_read, i2c2_debugfs_write,
1129              i2c2_debugfs_open, i2c2_debugfs_release),
1130     DEBUGFS_OPS("qsfp_dump%d", qsfp_debugfs_dump, NULL),
1131     DEBUGFS_XOPS("qsfp1", qsfp1_debugfs_read, qsfp1_debugfs_write,
1132              qsfp1_debugfs_open, qsfp1_debugfs_release),
1133     DEBUGFS_XOPS("qsfp2", qsfp2_debugfs_read, qsfp2_debugfs_write,
1134              qsfp2_debugfs_open, qsfp2_debugfs_release),
1135     DEBUGFS_XOPS("exprom_wp", exprom_wp_debugfs_read,
1136              exprom_wp_debugfs_write, exprom_wp_debugfs_open,
1137              exprom_wp_debugfs_release),
1138     DEBUGFS_OPS("asic_flags", asic_flags_read, asic_flags_write),
1139     DEBUGFS_OPS("dc8051_memory", dc8051_memory_read, NULL),
1140     DEBUGFS_OPS("lcb", debugfs_lcb_read, debugfs_lcb_write),
1141 };
1142 
1143 static void *_sdma_cpu_list_seq_start(struct seq_file *s, loff_t *pos)
1144 {
1145     if (*pos >= num_online_cpus())
1146         return NULL;
1147 
1148     return pos;
1149 }
1150 
1151 static void *_sdma_cpu_list_seq_next(struct seq_file *s, void *v, loff_t *pos)
1152 {
1153     ++*pos;
1154     if (*pos >= num_online_cpus())
1155         return NULL;
1156 
1157     return pos;
1158 }
1159 
1160 static void _sdma_cpu_list_seq_stop(struct seq_file *s, void *v)
1161 {
1162     /* nothing allocated */
1163 }
1164 
1165 static int _sdma_cpu_list_seq_show(struct seq_file *s, void *v)
1166 {
1167     struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
1168     struct hfi1_devdata *dd = dd_from_dev(ibd);
1169     loff_t *spos = v;
1170     loff_t i = *spos;
1171 
1172     sdma_seqfile_dump_cpu_list(s, dd, (unsigned long)i);
1173     return 0;
1174 }
1175 
1176 DEBUGFS_SEQ_FILE_OPS(sdma_cpu_list);
1177 DEBUGFS_SEQ_FILE_OPEN(sdma_cpu_list)
1178 DEBUGFS_FILE_OPS(sdma_cpu_list);
1179 
1180 void hfi1_dbg_ibdev_init(struct hfi1_ibdev *ibd)
1181 {
1182     char name[sizeof("port0counters") + 1];
1183     char link[10];
1184     struct hfi1_devdata *dd = dd_from_dev(ibd);
1185     struct hfi1_pportdata *ppd;
1186     struct dentry *root;
1187     int unit = dd->unit;
1188     int i, j;
1189 
1190     if (!hfi1_dbg_root)
1191         return;
1192     snprintf(name, sizeof(name), "%s_%d", class_name(), unit);
1193     snprintf(link, sizeof(link), "%d", unit);
1194     root = debugfs_create_dir(name, hfi1_dbg_root);
1195     ibd->hfi1_ibdev_dbg = root;
1196 
1197     ibd->hfi1_ibdev_link =
1198         debugfs_create_symlink(link, hfi1_dbg_root, name);
1199 
1200     debugfs_create_file("opcode_stats", 0444, root, ibd,
1201                 &_opcode_stats_file_ops);
1202     debugfs_create_file("tx_opcode_stats", 0444, root, ibd,
1203                 &_tx_opcode_stats_file_ops);
1204     debugfs_create_file("ctx_stats", 0444, root, ibd, &_ctx_stats_file_ops);
1205     debugfs_create_file("qp_stats", 0444, root, ibd, &_qp_stats_file_ops);
1206     debugfs_create_file("sdes", 0444, root, ibd, &_sdes_file_ops);
1207     debugfs_create_file("rcds", 0444, root, ibd, &_rcds_file_ops);
1208     debugfs_create_file("pios", 0444, root, ibd, &_pios_file_ops);
1209     debugfs_create_file("sdma_cpu_list", 0444, root, ibd,
1210                 &_sdma_cpu_list_file_ops);
1211 
1212     /* dev counter files */
1213     for (i = 0; i < ARRAY_SIZE(cntr_ops); i++)
1214         debugfs_create_file(cntr_ops[i].name, 0444, root, dd,
1215                     &cntr_ops[i].ops);
1216 
1217     /* per port files */
1218     for (ppd = dd->pport, j = 0; j < dd->num_pports; j++, ppd++)
1219         for (i = 0; i < ARRAY_SIZE(port_cntr_ops); i++) {
1220             snprintf(name,
1221                  sizeof(name),
1222                  port_cntr_ops[i].name,
1223                  j + 1);
1224             debugfs_create_file(name,
1225                         !port_cntr_ops[i].ops.write ?
1226                             S_IRUGO :
1227                             S_IRUGO | S_IWUSR,
1228                         root, ppd, &port_cntr_ops[i].ops);
1229         }
1230 
1231     hfi1_fault_init_debugfs(ibd);
1232 }
1233 
1234 void hfi1_dbg_ibdev_exit(struct hfi1_ibdev *ibd)
1235 {
1236     if (!hfi1_dbg_root)
1237         goto out;
1238     hfi1_fault_exit_debugfs(ibd);
1239     debugfs_remove(ibd->hfi1_ibdev_link);
1240     debugfs_remove_recursive(ibd->hfi1_ibdev_dbg);
1241 out:
1242     ibd->hfi1_ibdev_dbg = NULL;
1243 }
1244 
1245 /*
1246  * driver stats field names, one line per stat, single string.  Used by
1247  * programs like hfistats to print the stats in a way which works for
1248  * different versions of drivers, without changing program source.
1249  * if hfi1_ib_stats changes, this needs to change.  Names need to be
1250  * 12 chars or less (w/o newline), for proper display by hfistats utility.
1251  */
1252 static const char * const hfi1_statnames[] = {
1253     /* must be element 0*/
1254     "KernIntr",
1255     "ErrorIntr",
1256     "Tx_Errs",
1257     "Rcv_Errs",
1258     "H/W_Errs",
1259     "NoPIOBufs",
1260     "CtxtsOpen",
1261     "RcvLen_Errs",
1262     "EgrBufFull",
1263     "EgrHdrFull"
1264 };
1265 
1266 static void *_driver_stats_names_seq_start(struct seq_file *s, loff_t *pos)
1267 {
1268     if (*pos >= ARRAY_SIZE(hfi1_statnames))
1269         return NULL;
1270     return pos;
1271 }
1272 
1273 static void *_driver_stats_names_seq_next(
1274     struct seq_file *s,
1275     void *v,
1276     loff_t *pos)
1277 {
1278     ++*pos;
1279     if (*pos >= ARRAY_SIZE(hfi1_statnames))
1280         return NULL;
1281     return pos;
1282 }
1283 
1284 static void _driver_stats_names_seq_stop(struct seq_file *s, void *v)
1285 {
1286 }
1287 
1288 static int _driver_stats_names_seq_show(struct seq_file *s, void *v)
1289 {
1290     loff_t *spos = v;
1291 
1292     seq_printf(s, "%s\n", hfi1_statnames[*spos]);
1293     return 0;
1294 }
1295 
1296 DEBUGFS_SEQ_FILE_OPS(driver_stats_names);
1297 DEBUGFS_SEQ_FILE_OPEN(driver_stats_names)
1298 DEBUGFS_FILE_OPS(driver_stats_names);
1299 
1300 static void *_driver_stats_seq_start(struct seq_file *s, loff_t *pos)
1301 {
1302     if (*pos >= ARRAY_SIZE(hfi1_statnames))
1303         return NULL;
1304     return pos;
1305 }
1306 
1307 static void *_driver_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
1308 {
1309     ++*pos;
1310     if (*pos >= ARRAY_SIZE(hfi1_statnames))
1311         return NULL;
1312     return pos;
1313 }
1314 
1315 static void _driver_stats_seq_stop(struct seq_file *s, void *v)
1316 {
1317 }
1318 
1319 static void hfi1_sps_show_ints(struct seq_file *s)
1320 {
1321     unsigned long index, flags;
1322     struct hfi1_devdata *dd;
1323     u64 sps_ints = 0;
1324 
1325     xa_lock_irqsave(&hfi1_dev_table, flags);
1326     xa_for_each(&hfi1_dev_table, index, dd) {
1327         sps_ints += get_all_cpu_total(dd->int_counter);
1328     }
1329     xa_unlock_irqrestore(&hfi1_dev_table, flags);
1330     seq_write(s, &sps_ints, sizeof(u64));
1331 }
1332 
1333 static int _driver_stats_seq_show(struct seq_file *s, void *v)
1334 {
1335     loff_t *spos = v;
1336     u64 *stats = (u64 *)&hfi1_stats;
1337 
1338     /* special case for interrupts */
1339     if (*spos == 0)
1340         hfi1_sps_show_ints(s);
1341     else
1342         seq_write(s, stats + *spos, sizeof(u64));
1343     return 0;
1344 }
1345 
1346 DEBUGFS_SEQ_FILE_OPS(driver_stats);
1347 DEBUGFS_SEQ_FILE_OPEN(driver_stats)
1348 DEBUGFS_FILE_OPS(driver_stats);
1349 
1350 void hfi1_dbg_init(void)
1351 {
1352     hfi1_dbg_root  = debugfs_create_dir(DRIVER_NAME, NULL);
1353     debugfs_create_file("driver_stats_names", 0444, hfi1_dbg_root, NULL,
1354                 &_driver_stats_names_file_ops);
1355     debugfs_create_file("driver_stats", 0444, hfi1_dbg_root, NULL,
1356                 &_driver_stats_file_ops);
1357 }
1358 
1359 void hfi1_dbg_exit(void)
1360 {
1361     debugfs_remove_recursive(hfi1_dbg_root);
1362     hfi1_dbg_root = NULL;
1363 }
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