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@@ -0,0 +1,375 @@
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+/*
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+ * Copyright(c) 2018 Intel Corporation.
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+ *
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+ * This file is provided under a dual BSD/GPLv2 license. When using or
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+ * redistributing this file, you may do so under either license.
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+ *
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+ * GPL LICENSE SUMMARY
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of version 2 of the GNU General Public License as
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+ * published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * General Public License for more details.
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+ *
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+ * BSD LICENSE
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions
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+ * are met:
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+ *
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+ * - Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions and the following disclaimer.
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+ * - Redistributions in binary form must reproduce the above copyright
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+ * notice, this list of conditions and the following disclaimer in
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+ * the documentation and/or other materials provided with the
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+ * distribution.
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+ * - Neither the name of Intel Corporation nor the names of its
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+ * contributors may be used to endorse or promote products derived
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+ * from this software without specific prior written permission.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+ *
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+ */
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+#include <linux/debugfs.h>
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+#include <linux/seq_file.h>
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/types.h>
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+#include <linux/bitmap.h>
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+
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+#include "debugfs.h"
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+#include "fault.h"
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+#include "trace.h"
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+
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+#define HFI1_FAULT_DIR_TX BIT(0)
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+#define HFI1_FAULT_DIR_RX BIT(1)
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+#define HFI1_FAULT_DIR_TXRX (HFI1_FAULT_DIR_TX | HFI1_FAULT_DIR_RX)
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+
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+static void *_fault_stats_seq_start(struct seq_file *s, loff_t *pos)
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+{
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+ struct hfi1_opcode_stats_perctx *opstats;
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+
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+ if (*pos >= ARRAY_SIZE(opstats->stats))
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+ return NULL;
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+ return pos;
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+}
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+
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+static void *_fault_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
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+{
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+ struct hfi1_opcode_stats_perctx *opstats;
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+
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+ ++*pos;
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+ if (*pos >= ARRAY_SIZE(opstats->stats))
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+ return NULL;
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+ return pos;
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+}
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+
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+static void _fault_stats_seq_stop(struct seq_file *s, void *v)
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+{
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+}
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+
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+static int _fault_stats_seq_show(struct seq_file *s, void *v)
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+{
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+ loff_t *spos = v;
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+ loff_t i = *spos, j;
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+ u64 n_packets = 0, n_bytes = 0;
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+ struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
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+ struct hfi1_devdata *dd = dd_from_dev(ibd);
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+ struct hfi1_ctxtdata *rcd;
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+
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+ for (j = 0; j < dd->first_dyn_alloc_ctxt; j++) {
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+ rcd = hfi1_rcd_get_by_index(dd, j);
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+ if (rcd) {
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+ n_packets += rcd->opstats->stats[i].n_packets;
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+ n_bytes += rcd->opstats->stats[i].n_bytes;
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+ }
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+ hfi1_rcd_put(rcd);
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+ }
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+ for_each_possible_cpu(j) {
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+ struct hfi1_opcode_stats_perctx *sp =
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+ per_cpu_ptr(dd->tx_opstats, j);
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+
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+ n_packets += sp->stats[i].n_packets;
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+ n_bytes += sp->stats[i].n_bytes;
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+ }
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+ if (!n_packets && !n_bytes)
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+ return SEQ_SKIP;
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+ if (!ibd->fault->n_rxfaults[i] && !ibd->fault->n_txfaults[i])
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+ return SEQ_SKIP;
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+ seq_printf(s, "%02llx %llu/%llu (faults rx:%llu faults: tx:%llu)\n", i,
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+ (unsigned long long)n_packets,
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+ (unsigned long long)n_bytes,
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+ (unsigned long long)ibd->fault->n_rxfaults[i],
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+ (unsigned long long)ibd->fault->n_txfaults[i]);
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+ return 0;
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+}
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+
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+DEBUGFS_SEQ_FILE_OPS(fault_stats);
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+DEBUGFS_SEQ_FILE_OPEN(fault_stats);
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+DEBUGFS_FILE_OPS(fault_stats);
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+
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+static int fault_opcodes_open(struct inode *inode, struct file *file)
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+{
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+ file->private_data = inode->i_private;
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+ return nonseekable_open(inode, file);
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+}
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+
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+static ssize_t fault_opcodes_write(struct file *file, const char __user *buf,
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+ size_t len, loff_t *pos)
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+{
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+ ssize_t ret = 0;
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+ /* 1280 = 256 opcodes * 4 chars/opcode + 255 commas + NULL */
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+ size_t copy, datalen = 1280;
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+ char *data, *token, *ptr, *end;
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+ struct fault *fault = file->private_data;
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+
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+ data = kcalloc(datalen, sizeof(*data), GFP_KERNEL);
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+ if (!data)
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+ return -ENOMEM;
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+ copy = min(len, datalen - 1);
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+ if (copy_from_user(data, buf, copy))
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+ return -EFAULT;
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+
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+ ret = debugfs_file_get(file->f_path.dentry);
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+ if (unlikely(ret))
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+ return ret;
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+ ptr = data;
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+ token = ptr;
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+ for (ptr = data; *ptr; ptr = end + 1, token = ptr) {
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+ char *dash;
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+ unsigned long range_start, range_end, i;
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+ bool remove = false;
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+
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+ end = strchr(ptr, ',');
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+ if (end)
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+ *end = '\0';
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+ if (token[0] == '-') {
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+ remove = true;
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+ token++;
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+ }
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+ dash = strchr(token, '-');
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+ if (dash)
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+ *dash = '\0';
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+ if (kstrtoul(token, 0, &range_start))
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+ break;
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+ if (dash) {
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+ token = dash + 1;
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+ if (kstrtoul(token, 0, &range_end))
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+ break;
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+ } else {
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+ range_end = range_start;
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+ }
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+ if (range_start == range_end && range_start == -1UL) {
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+ bitmap_zero(fault->opcodes, sizeof(fault->opcodes) *
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+ BITS_PER_BYTE);
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+ break;
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+ }
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+ for (i = range_start; i <= range_end; i++) {
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+ if (remove)
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+ clear_bit(i, fault->opcodes);
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+ else
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+ set_bit(i, fault->opcodes);
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+ }
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+ if (!end)
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+ break;
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+ }
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+ ret = len;
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+
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+ debugfs_file_put(file->f_path.dentry);
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+ kfree(data);
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+ return ret;
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+}
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+
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+static ssize_t fault_opcodes_read(struct file *file, char __user *buf,
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+ size_t len, loff_t *pos)
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+{
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+ ssize_t ret = 0;
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+ char *data;
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+ size_t datalen = 1280, size = 0; /* see fault_opcodes_write() */
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+ unsigned long bit = 0, zero = 0;
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+ struct fault *fault = file->private_data;
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+ size_t bitsize = sizeof(fault->opcodes) * BITS_PER_BYTE;
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+
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+ data = kcalloc(datalen, sizeof(*data), GFP_KERNEL);
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+ if (!data)
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+ return -ENOMEM;
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+ ret = debugfs_file_get(file->f_path.dentry);
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+ if (unlikely(ret))
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+ return ret;
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+ bit = find_first_bit(fault->opcodes, bitsize);
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+ while (bit < bitsize) {
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+ zero = find_next_zero_bit(fault->opcodes, bitsize, bit);
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+ if (zero - 1 != bit)
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+ size += snprintf(data + size,
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+ datalen - size - 1,
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+ "0x%lx-0x%lx,", bit, zero - 1);
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+ else
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+ size += snprintf(data + size,
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+ datalen - size - 1, "0x%lx,",
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+ bit);
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+ bit = find_next_bit(fault->opcodes, bitsize, zero);
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+ }
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+ debugfs_file_put(file->f_path.dentry);
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+ data[size - 1] = '\n';
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+ data[size] = '\0';
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+ ret = simple_read_from_buffer(buf, len, pos, data, size);
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+ kfree(data);
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+ return ret;
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+}
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+
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+static const struct file_operations __fault_opcodes_fops = {
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+ .owner = THIS_MODULE,
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+ .open = fault_opcodes_open,
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+ .read = fault_opcodes_read,
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+ .write = fault_opcodes_write,
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+ .llseek = no_llseek
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+};
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+
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+void hfi1_fault_exit_debugfs(struct hfi1_ibdev *ibd)
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+{
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+ if (ibd->fault)
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+ debugfs_remove_recursive(ibd->fault->dir);
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+ kfree(ibd->fault);
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+ ibd->fault = NULL;
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+}
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+
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+int hfi1_fault_init_debugfs(struct hfi1_ibdev *ibd)
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+{
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+ struct dentry *parent = ibd->hfi1_ibdev_dbg;
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+
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+ ibd->fault = kzalloc(sizeof(*ibd->fault), GFP_KERNEL);
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+ if (!ibd->fault)
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+ return -ENOMEM;
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+
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+ ibd->fault->attr.interval = 1;
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+ ibd->fault->attr.require_end = ULONG_MAX;
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+ ibd->fault->attr.stacktrace_depth = 32;
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+ ibd->fault->attr.dname = NULL;
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+ ibd->fault->attr.verbose = 0;
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+ ibd->fault->enable = false;
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+ ibd->fault->opcode = false;
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+ ibd->fault->fault_skip = 0;
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+ ibd->fault->skip = 0;
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+ ibd->fault->direction = HFI1_FAULT_DIR_TXRX;
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+ ibd->fault->suppress_err = false;
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+ bitmap_zero(ibd->fault->opcodes,
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+ sizeof(ibd->fault->opcodes) * BITS_PER_BYTE);
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+
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+ ibd->fault->dir =
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+ fault_create_debugfs_attr("fault", parent,
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+ &ibd->fault->attr);
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+ if (IS_ERR(ibd->fault->dir)) {
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+ kfree(ibd->fault);
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+ ibd->fault = NULL;
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+ return -ENOENT;
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+ }
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+
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+ DEBUGFS_SEQ_FILE_CREATE(fault_stats, ibd->fault->dir, ibd);
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+ if (!debugfs_create_bool("enable", 0600, ibd->fault->dir,
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+ &ibd->fault->enable))
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+ goto fail;
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+ if (!debugfs_create_bool("suppress_err", 0600,
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+ ibd->fault->dir,
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+ &ibd->fault->suppress_err))
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+ goto fail;
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+ if (!debugfs_create_bool("opcode_mode", 0600, ibd->fault->dir,
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+ &ibd->fault->opcode))
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+ goto fail;
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+ if (!debugfs_create_file("opcodes", 0600, ibd->fault->dir,
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+ ibd->fault, &__fault_opcodes_fops))
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+ goto fail;
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+ if (!debugfs_create_u64("skip_pkts", 0600,
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+ ibd->fault->dir,
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+ &ibd->fault->fault_skip))
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+ goto fail;
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+ if (!debugfs_create_u64("skip_usec", 0600,
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+ ibd->fault->dir,
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+ &ibd->fault->fault_skip_usec))
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+ goto fail;
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+ if (!debugfs_create_u8("direction", 0600, ibd->fault->dir,
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+ &ibd->fault->direction))
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+ goto fail;
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+
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+ return 0;
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+fail:
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+ hfi1_fault_exit_debugfs(ibd);
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+ return -ENOMEM;
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+}
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+
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+bool hfi1_dbg_fault_suppress_err(struct hfi1_ibdev *ibd)
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+{
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+ if (ibd->fault)
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+ return ibd->fault->suppress_err;
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+ return false;
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+}
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+
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+static bool __hfi1_should_fault(struct hfi1_ibdev *ibd, u32 opcode,
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+ u8 direction)
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+{
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+ bool ret = false;
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+
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+ if (!ibd->fault || !ibd->fault->enable)
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+ return false;
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+ if (!(ibd->fault->direction & direction))
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+ return false;
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+ if (ibd->fault->opcode) {
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+ if (bitmap_empty(ibd->fault->opcodes,
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+ (sizeof(ibd->fault->opcodes) *
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+ BITS_PER_BYTE)))
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+ return false;
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+ if (!(test_bit(opcode, ibd->fault->opcodes)))
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+ return false;
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+ }
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+ if (ibd->fault->fault_skip_usec &&
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+ time_before(jiffies, ibd->fault->skip_usec))
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+ return false;
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+ if (ibd->fault->fault_skip && ibd->fault->skip) {
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+ ibd->fault->skip--;
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+ return false;
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+ }
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+ ret = should_fail(&ibd->fault->attr, 1);
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+ if (ret) {
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+ ibd->fault->skip = ibd->fault->fault_skip;
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+ ibd->fault->skip_usec = jiffies +
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+ usecs_to_jiffies(ibd->fault->fault_skip_usec);
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+ }
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+ return ret;
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+}
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+
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+bool hfi1_dbg_should_fault_tx(struct rvt_qp *qp, u32 opcode)
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+{
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+ struct hfi1_ibdev *ibd = to_idev(qp->ibqp.device);
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+
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+ if (__hfi1_should_fault(ibd, opcode, HFI1_FAULT_DIR_TX)) {
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+ trace_hfi1_fault_opcode(qp, opcode);
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+ ibd->fault->n_txfaults[opcode]++;
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+ return true;
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+ }
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+ return false;
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+}
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+
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+bool hfi1_dbg_should_fault_rx(struct hfi1_packet *packet)
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+{
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+ struct hfi1_ibdev *ibd = &packet->rcd->dd->verbs_dev;
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+
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+ if (__hfi1_should_fault(ibd, packet->opcode, HFI1_FAULT_DIR_RX)) {
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+ trace_hfi1_fault_packet(packet);
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+ ibd->fault->n_rxfaults[packet->opcode]++;
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+ return true;
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+ }
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+ return false;
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+}
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Mitko Haralanov