Documentation: ACPI: DSD: Convert LED documentation to ReST
[linux-2.6-block.git] / drivers / infiniband / hw / hfi1 / fault.c
1 /*
2  * Copyright(c) 2018 Intel Corporation.
3  *
4  * This file is provided under a dual BSD/GPLv2 license.  When using or
5  * redistributing this file, you may do so under either license.
6  *
7  * GPL LICENSE SUMMARY
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of version 2 of the GNU General Public License as
11  * published by the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful, but
14  * WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * General Public License for more details.
17  *
18  * BSD LICENSE
19  *
20  * Redistribution and use in source and binary forms, with or without
21  * modification, are permitted provided that the following conditions
22  * are met:
23  *
24  *  - Redistributions of source code must retain the above copyright
25  *    notice, this list of conditions and the following disclaimer.
26  *  - Redistributions in binary form must reproduce the above copyright
27  *    notice, this list of conditions and the following disclaimer in
28  *    the documentation and/or other materials provided with the
29  *    distribution.
30  *  - Neither the name of Intel Corporation nor the names of its
31  *    contributors may be used to endorse or promote products derived
32  *    from this software without specific prior written permission.
33  *
34  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
35  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
36  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
37  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
38  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
39  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
40  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
41  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
42  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
43  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
44  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
45  *
46  */
47 #include <linux/debugfs.h>
48 #include <linux/seq_file.h>
49 #include <linux/kernel.h>
50 #include <linux/module.h>
51 #include <linux/types.h>
52 #include <linux/bitmap.h>
53
54 #include "debugfs.h"
55 #include "fault.h"
56 #include "trace.h"
57
58 #define HFI1_FAULT_DIR_TX   BIT(0)
59 #define HFI1_FAULT_DIR_RX   BIT(1)
60 #define HFI1_FAULT_DIR_TXRX (HFI1_FAULT_DIR_TX | HFI1_FAULT_DIR_RX)
61
62 static void *_fault_stats_seq_start(struct seq_file *s, loff_t *pos)
63 {
64         struct hfi1_opcode_stats_perctx *opstats;
65
66         if (*pos >= ARRAY_SIZE(opstats->stats))
67                 return NULL;
68         return pos;
69 }
70
71 static void *_fault_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
72 {
73         struct hfi1_opcode_stats_perctx *opstats;
74
75         ++*pos;
76         if (*pos >= ARRAY_SIZE(opstats->stats))
77                 return NULL;
78         return pos;
79 }
80
81 static void _fault_stats_seq_stop(struct seq_file *s, void *v)
82 {
83 }
84
85 static int _fault_stats_seq_show(struct seq_file *s, void *v)
86 {
87         loff_t *spos = v;
88         loff_t i = *spos, j;
89         u64 n_packets = 0, n_bytes = 0;
90         struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
91         struct hfi1_devdata *dd = dd_from_dev(ibd);
92         struct hfi1_ctxtdata *rcd;
93
94         for (j = 0; j < dd->first_dyn_alloc_ctxt; j++) {
95                 rcd = hfi1_rcd_get_by_index(dd, j);
96                 if (rcd) {
97                         n_packets += rcd->opstats->stats[i].n_packets;
98                         n_bytes += rcd->opstats->stats[i].n_bytes;
99                 }
100                 hfi1_rcd_put(rcd);
101         }
102         for_each_possible_cpu(j) {
103                 struct hfi1_opcode_stats_perctx *sp =
104                         per_cpu_ptr(dd->tx_opstats, j);
105
106                 n_packets += sp->stats[i].n_packets;
107                 n_bytes += sp->stats[i].n_bytes;
108         }
109         if (!n_packets && !n_bytes)
110                 return SEQ_SKIP;
111         if (!ibd->fault->n_rxfaults[i] && !ibd->fault->n_txfaults[i])
112                 return SEQ_SKIP;
113         seq_printf(s, "%02llx %llu/%llu (faults rx:%llu faults: tx:%llu)\n", i,
114                    (unsigned long long)n_packets,
115                    (unsigned long long)n_bytes,
116                    (unsigned long long)ibd->fault->n_rxfaults[i],
117                    (unsigned long long)ibd->fault->n_txfaults[i]);
118         return 0;
119 }
120
121 DEBUGFS_SEQ_FILE_OPS(fault_stats);
122 DEBUGFS_SEQ_FILE_OPEN(fault_stats);
123 DEBUGFS_FILE_OPS(fault_stats);
124
125 static int fault_opcodes_open(struct inode *inode, struct file *file)
126 {
127         file->private_data = inode->i_private;
128         return nonseekable_open(inode, file);
129 }
130
131 static ssize_t fault_opcodes_write(struct file *file, const char __user *buf,
132                                    size_t len, loff_t *pos)
133 {
134         ssize_t ret = 0;
135         /* 1280 = 256 opcodes * 4 chars/opcode + 255 commas + NULL */
136         size_t copy, datalen = 1280;
137         char *data, *token, *ptr, *end;
138         struct fault *fault = file->private_data;
139
140         data = kcalloc(datalen, sizeof(*data), GFP_KERNEL);
141         if (!data)
142                 return -ENOMEM;
143         copy = min(len, datalen - 1);
144         if (copy_from_user(data, buf, copy))
145                 return -EFAULT;
146
147         ret = debugfs_file_get(file->f_path.dentry);
148         if (unlikely(ret))
149                 return ret;
150         ptr = data;
151         token = ptr;
152         for (ptr = data; *ptr; ptr = end + 1, token = ptr) {
153                 char *dash;
154                 unsigned long range_start, range_end, i;
155                 bool remove = false;
156                 unsigned long bound = 1U << BITS_PER_BYTE;
157
158                 end = strchr(ptr, ',');
159                 if (end)
160                         *end = '\0';
161                 if (token[0] == '-') {
162                         remove = true;
163                         token++;
164                 }
165                 dash = strchr(token, '-');
166                 if (dash)
167                         *dash = '\0';
168                 if (kstrtoul(token, 0, &range_start))
169                         break;
170                 if (dash) {
171                         token = dash + 1;
172                         if (kstrtoul(token, 0, &range_end))
173                                 break;
174                 } else {
175                         range_end = range_start;
176                 }
177                 if (range_start == range_end && range_start == -1UL) {
178                         bitmap_zero(fault->opcodes, sizeof(fault->opcodes) *
179                                     BITS_PER_BYTE);
180                         break;
181                 }
182                 /* Check the inputs */
183                 if (range_start >= bound || range_end >= bound)
184                         break;
185
186                 for (i = range_start; i <= range_end; i++) {
187                         if (remove)
188                                 clear_bit(i, fault->opcodes);
189                         else
190                                 set_bit(i, fault->opcodes);
191                 }
192                 if (!end)
193                         break;
194         }
195         ret = len;
196
197         debugfs_file_put(file->f_path.dentry);
198         kfree(data);
199         return ret;
200 }
201
202 static ssize_t fault_opcodes_read(struct file *file, char __user *buf,
203                                   size_t len, loff_t *pos)
204 {
205         ssize_t ret = 0;
206         char *data;
207         size_t datalen = 1280, size = 0; /* see fault_opcodes_write() */
208         unsigned long bit = 0, zero = 0;
209         struct fault *fault = file->private_data;
210         size_t bitsize = sizeof(fault->opcodes) * BITS_PER_BYTE;
211
212         data = kcalloc(datalen, sizeof(*data), GFP_KERNEL);
213         if (!data)
214                 return -ENOMEM;
215         ret = debugfs_file_get(file->f_path.dentry);
216         if (unlikely(ret))
217                 return ret;
218         bit = find_first_bit(fault->opcodes, bitsize);
219         while (bit < bitsize) {
220                 zero = find_next_zero_bit(fault->opcodes, bitsize, bit);
221                 if (zero - 1 != bit)
222                         size += snprintf(data + size,
223                                          datalen - size - 1,
224                                          "0x%lx-0x%lx,", bit, zero - 1);
225                 else
226                         size += snprintf(data + size,
227                                          datalen - size - 1, "0x%lx,",
228                                          bit);
229                 bit = find_next_bit(fault->opcodes, bitsize, zero);
230         }
231         debugfs_file_put(file->f_path.dentry);
232         data[size - 1] = '\n';
233         data[size] = '\0';
234         ret = simple_read_from_buffer(buf, len, pos, data, size);
235         kfree(data);
236         return ret;
237 }
238
239 static const struct file_operations __fault_opcodes_fops = {
240         .owner = THIS_MODULE,
241         .open = fault_opcodes_open,
242         .read = fault_opcodes_read,
243         .write = fault_opcodes_write,
244         .llseek = no_llseek
245 };
246
247 void hfi1_fault_exit_debugfs(struct hfi1_ibdev *ibd)
248 {
249         if (ibd->fault)
250                 debugfs_remove_recursive(ibd->fault->dir);
251         kfree(ibd->fault);
252         ibd->fault = NULL;
253 }
254
255 int hfi1_fault_init_debugfs(struct hfi1_ibdev *ibd)
256 {
257         struct dentry *parent = ibd->hfi1_ibdev_dbg;
258         struct dentry *fault_dir;
259
260         ibd->fault = kzalloc(sizeof(*ibd->fault), GFP_KERNEL);
261         if (!ibd->fault)
262                 return -ENOMEM;
263
264         ibd->fault->attr.interval = 1;
265         ibd->fault->attr.require_end = ULONG_MAX;
266         ibd->fault->attr.stacktrace_depth = 32;
267         ibd->fault->attr.dname = NULL;
268         ibd->fault->attr.verbose = 0;
269         ibd->fault->enable = false;
270         ibd->fault->opcode = false;
271         ibd->fault->fault_skip = 0;
272         ibd->fault->skip = 0;
273         ibd->fault->direction = HFI1_FAULT_DIR_TXRX;
274         ibd->fault->suppress_err = false;
275         bitmap_zero(ibd->fault->opcodes,
276                     sizeof(ibd->fault->opcodes) * BITS_PER_BYTE);
277
278         fault_dir =
279                 fault_create_debugfs_attr("fault", parent, &ibd->fault->attr);
280         if (IS_ERR(fault_dir)) {
281                 kfree(ibd->fault);
282                 ibd->fault = NULL;
283                 return -ENOENT;
284         }
285         ibd->fault->dir = fault_dir;
286
287         debugfs_create_file("fault_stats", 0444, fault_dir, ibd,
288                             &_fault_stats_file_ops);
289         debugfs_create_bool("enable", 0600, fault_dir, &ibd->fault->enable);
290         debugfs_create_bool("suppress_err", 0600, fault_dir,
291                             &ibd->fault->suppress_err);
292         debugfs_create_bool("opcode_mode", 0600, fault_dir,
293                             &ibd->fault->opcode);
294         debugfs_create_file("opcodes", 0600, fault_dir, ibd->fault,
295                             &__fault_opcodes_fops);
296         debugfs_create_u64("skip_pkts", 0600, fault_dir,
297                            &ibd->fault->fault_skip);
298         debugfs_create_u64("skip_usec", 0600, fault_dir,
299                            &ibd->fault->fault_skip_usec);
300         debugfs_create_u8("direction", 0600, fault_dir, &ibd->fault->direction);
301
302         return 0;
303 }
304
305 bool hfi1_dbg_fault_suppress_err(struct hfi1_ibdev *ibd)
306 {
307         if (ibd->fault)
308                 return ibd->fault->suppress_err;
309         return false;
310 }
311
312 static bool __hfi1_should_fault(struct hfi1_ibdev *ibd, u32 opcode,
313                                 u8 direction)
314 {
315         bool ret = false;
316
317         if (!ibd->fault || !ibd->fault->enable)
318                 return false;
319         if (!(ibd->fault->direction & direction))
320                 return false;
321         if (ibd->fault->opcode) {
322                 if (bitmap_empty(ibd->fault->opcodes,
323                                  (sizeof(ibd->fault->opcodes) *
324                                   BITS_PER_BYTE)))
325                         return false;
326                 if (!(test_bit(opcode, ibd->fault->opcodes)))
327                         return false;
328         }
329         if (ibd->fault->fault_skip_usec &&
330             time_before(jiffies, ibd->fault->skip_usec))
331                 return false;
332         if (ibd->fault->fault_skip && ibd->fault->skip) {
333                 ibd->fault->skip--;
334                 return false;
335         }
336         ret = should_fail(&ibd->fault->attr, 1);
337         if (ret) {
338                 ibd->fault->skip = ibd->fault->fault_skip;
339                 ibd->fault->skip_usec = jiffies +
340                         usecs_to_jiffies(ibd->fault->fault_skip_usec);
341         }
342         return ret;
343 }
344
345 bool hfi1_dbg_should_fault_tx(struct rvt_qp *qp, u32 opcode)
346 {
347         struct hfi1_ibdev *ibd = to_idev(qp->ibqp.device);
348
349         if (__hfi1_should_fault(ibd, opcode, HFI1_FAULT_DIR_TX)) {
350                 trace_hfi1_fault_opcode(qp, opcode);
351                 ibd->fault->n_txfaults[opcode]++;
352                 return true;
353         }
354         return false;
355 }
356
357 bool hfi1_dbg_should_fault_rx(struct hfi1_packet *packet)
358 {
359         struct hfi1_ibdev *ibd = &packet->rcd->dd->verbs_dev;
360
361         if (__hfi1_should_fault(ibd, packet->opcode, HFI1_FAULT_DIR_RX)) {
362                 trace_hfi1_fault_packet(packet);
363                 ibd->fault->n_rxfaults[packet->opcode]++;
364                 return true;
365         }
366         return false;
367 }