1 files changed, 329 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/hfi1/fault.c b/drivers/infiniband/hw/hfi1/fault.c
new file mode 100644
index 0000000000..3af77a0840
--- /dev/null
+++ b/drivers/infiniband/hw/hfi1/fault.c
@@ -0,0 +1,329 @@
+// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
+/*
+ * Copyright(c) 2018 Intel Corporation.
+ */
+
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/bitmap.h>
+
+#include "debugfs.h"
+#include "fault.h"
+#include "trace.h"
+
+#define HFI1_FAULT_DIR_TX   BIT(0)
+#define HFI1_FAULT_DIR_RX   BIT(1)
+#define HFI1_FAULT_DIR_TXRX (HFI1_FAULT_DIR_TX | HFI1_FAULT_DIR_RX)
+
+static void *_fault_stats_seq_start(struct seq_file *s, loff_t *pos)
+{
+	struct hfi1_opcode_stats_perctx *opstats;
+
+	if (*pos >= ARRAY_SIZE(opstats->stats))
+		return NULL;
+	return pos;
+}
+
+static void *_fault_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+	struct hfi1_opcode_stats_perctx *opstats;
+
+	++*pos;
+	if (*pos >= ARRAY_SIZE(opstats->stats))
+		return NULL;
+	return pos;
+}
+
+static void _fault_stats_seq_stop(struct seq_file *s, void *v)
+{
+}
+
+static int _fault_stats_seq_show(struct seq_file *s, void *v)
+{
+	loff_t *spos = v;
+	loff_t i = *spos, j;
+	u64 n_packets = 0, n_bytes = 0;
+	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
+	struct hfi1_devdata *dd = dd_from_dev(ibd);
+	struct hfi1_ctxtdata *rcd;
+
+	for (j = 0; j < dd->first_dyn_alloc_ctxt; j++) {
+		rcd = hfi1_rcd_get_by_index(dd, j);
+		if (rcd) {
+			n_packets += rcd->opstats->stats[i].n_packets;
+			n_bytes += rcd->opstats->stats[i].n_bytes;
+		}
+		hfi1_rcd_put(rcd);
+	}
+	for_each_possible_cpu(j) {
+		struct hfi1_opcode_stats_perctx *sp =
+			per_cpu_ptr(dd->tx_opstats, j);
+
+		n_packets += sp->stats[i].n_packets;
+		n_bytes += sp->stats[i].n_bytes;
+	}
+	if (!n_packets && !n_bytes)
+		return SEQ_SKIP;
+	if (!ibd->fault->n_rxfaults[i] && !ibd->fault->n_txfaults[i])
+		return SEQ_SKIP;
+	seq_printf(s, "%02llx %llu/%llu (faults rx:%llu faults: tx:%llu)\n", i,
+		   (unsigned long long)n_packets,
+		   (unsigned long long)n_bytes,
+		   (unsigned long long)ibd->fault->n_rxfaults[i],
+		   (unsigned long long)ibd->fault->n_txfaults[i]);
+	return 0;
+}
+
+DEBUGFS_SEQ_FILE_OPS(fault_stats);
+DEBUGFS_SEQ_FILE_OPEN(fault_stats);
+DEBUGFS_FILE_OPS(fault_stats);
+
+static int fault_opcodes_open(struct inode *inode, struct file *file)
+{
+	file->private_data = inode->i_private;
+	return nonseekable_open(inode, file);
+}
+
+static ssize_t fault_opcodes_write(struct file *file, const char __user *buf,
+				   size_t len, loff_t *pos)
+{
+	ssize_t ret = 0;
+	/* 1280 = 256 opcodes * 4 chars/opcode + 255 commas + NULL */
+	size_t copy, datalen = 1280;
+	char *data, *token, *ptr, *end;
+	struct fault *fault = file->private_data;
+
+	data = kcalloc(datalen, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+	copy = min(len, datalen - 1);
+	if (copy_from_user(data, buf, copy)) {
+		ret = -EFAULT;
+		goto free_data;
+	}
+
+	ret = debugfs_file_get(file->f_path.dentry);
+	if (unlikely(ret))
+		goto free_data;
+	ptr = data;
+	token = ptr;
+	for (ptr = data; *ptr; ptr = end + 1, token = ptr) {
+		char *dash;
+		unsigned long range_start, range_end, i;
+		bool remove = false;
+		unsigned long bound = 1U << BITS_PER_BYTE;
+
+		end = strchr(ptr, ',');
+		if (end)
+			*end = '\0';
+		if (token[0] == '-') {
+			remove = true;
+			token++;
+		}
+		dash = strchr(token, '-');
+		if (dash)
+			*dash = '\0';
+		if (kstrtoul(token, 0, &range_start))
+			break;
+		if (dash) {
+			token = dash + 1;
+			if (kstrtoul(token, 0, &range_end))
+				break;
+		} else {
+			range_end = range_start;
+		}
+		if (range_start == range_end && range_start == -1UL) {
+			bitmap_zero(fault->opcodes, sizeof(fault->opcodes) *
+				    BITS_PER_BYTE);
+			break;
+		}
+		/* Check the inputs */
+		if (range_start >= bound || range_end >= bound)
+			break;
+
+		for (i = range_start; i <= range_end; i++) {
+			if (remove)
+				clear_bit(i, fault->opcodes);
+			else
+				set_bit(i, fault->opcodes);
+		}
+		if (!end)
+			break;
+	}
+	ret = len;
+
+	debugfs_file_put(file->f_path.dentry);
+free_data:
+	kfree(data);
+	return ret;
+}
+
+static ssize_t fault_opcodes_read(struct file *file, char __user *buf,
+				  size_t len, loff_t *pos)
+{
+	ssize_t ret = 0;
+	char *data;
+	size_t datalen = 1280, size = 0; /* see fault_opcodes_write() */
+	unsigned long bit = 0, zero = 0;
+	struct fault *fault = file->private_data;
+	size_t bitsize = sizeof(fault->opcodes) * BITS_PER_BYTE;
+
+	data = kcalloc(datalen, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+	ret = debugfs_file_get(file->f_path.dentry);
+	if (unlikely(ret))
+		goto free_data;
+	bit = find_first_bit(fault->opcodes, bitsize);
+	while (bit < bitsize) {
+		zero = find_next_zero_bit(fault->opcodes, bitsize, bit);
+		if (zero - 1 != bit)
+			size += scnprintf(data + size,
+					 datalen - size - 1,
+					 "0x%lx-0x%lx,", bit, zero - 1);
+		else
+			size += scnprintf(data + size,
+					 datalen - size - 1, "0x%lx,",
+					 bit);
+		bit = find_next_bit(fault->opcodes, bitsize, zero);
+	}
+	debugfs_file_put(file->f_path.dentry);
+	data[size - 1] = '\n';
+	data[size] = '\0';
+	ret = simple_read_from_buffer(buf, len, pos, data, size);
+free_data:
+	kfree(data);
+	return ret;
+}
+
+static const struct file_operations __fault_opcodes_fops = {
+	.owner = THIS_MODULE,
+	.open = fault_opcodes_open,
+	.read = fault_opcodes_read,
+	.write = fault_opcodes_write,
+	.llseek = no_llseek
+};
+
+void hfi1_fault_exit_debugfs(struct hfi1_ibdev *ibd)
+{
+	if (ibd->fault)
+		debugfs_remove_recursive(ibd->fault->dir);
+	kfree(ibd->fault);
+	ibd->fault = NULL;
+}
+
+int hfi1_fault_init_debugfs(struct hfi1_ibdev *ibd)
+{
+	struct dentry *parent = ibd->hfi1_ibdev_dbg;
+	struct dentry *fault_dir;
+
+	ibd->fault = kzalloc(sizeof(*ibd->fault), GFP_KERNEL);
+	if (!ibd->fault)
+		return -ENOMEM;
+
+	ibd->fault->attr.interval = 1;
+	ibd->fault->attr.require_end = ULONG_MAX;
+	ibd->fault->attr.stacktrace_depth = 32;
+	ibd->fault->attr.dname = NULL;
+	ibd->fault->attr.verbose = 0;
+	ibd->fault->enable = false;
+	ibd->fault->opcode = false;
+	ibd->fault->fault_skip = 0;
+	ibd->fault->skip = 0;
+	ibd->fault->direction = HFI1_FAULT_DIR_TXRX;
+	ibd->fault->suppress_err = false;
+	bitmap_zero(ibd->fault->opcodes,
+		    sizeof(ibd->fault->opcodes) * BITS_PER_BYTE);
+
+	fault_dir =
+		fault_create_debugfs_attr("fault", parent, &ibd->fault->attr);
+	if (IS_ERR(fault_dir)) {
+		kfree(ibd->fault);
+		ibd->fault = NULL;
+		return -ENOENT;
+	}
+	ibd->fault->dir = fault_dir;
+
+	debugfs_create_file("fault_stats", 0444, fault_dir, ibd,
+			    &_fault_stats_file_ops);
+	debugfs_create_bool("enable", 0600, fault_dir, &ibd->fault->enable);
+	debugfs_create_bool("suppress_err", 0600, fault_dir,
+			    &ibd->fault->suppress_err);
+	debugfs_create_bool("opcode_mode", 0600, fault_dir,
+			    &ibd->fault->opcode);
+	debugfs_create_file("opcodes", 0600, fault_dir, ibd->fault,
+			    &__fault_opcodes_fops);
+	debugfs_create_u64("skip_pkts", 0600, fault_dir,
+			   &ibd->fault->fault_skip);
+	debugfs_create_u64("skip_usec", 0600, fault_dir,
+			   &ibd->fault->fault_skip_usec);
+	debugfs_create_u8("direction", 0600, fault_dir, &ibd->fault->direction);
+
+	return 0;
+}
+
+bool hfi1_dbg_fault_suppress_err(struct hfi1_ibdev *ibd)
+{
+	if (ibd->fault)
+		return ibd->fault->suppress_err;
+	return false;
+}
+
+static bool __hfi1_should_fault(struct hfi1_ibdev *ibd, u32 opcode,
+				u8 direction)
+{
+	bool ret = false;
+
+	if (!ibd->fault || !ibd->fault->enable)
+		return false;
+	if (!(ibd->fault->direction & direction))
+		return false;
+	if (ibd->fault->opcode) {
+		if (bitmap_empty(ibd->fault->opcodes,
+				 (sizeof(ibd->fault->opcodes) *
+				  BITS_PER_BYTE)))
+			return false;
+		if (!(test_bit(opcode, ibd->fault->opcodes)))
+			return false;
+	}
+	if (ibd->fault->fault_skip_usec &&
+	    time_before(jiffies, ibd->fault->skip_usec))
+		return false;
+	if (ibd->fault->fault_skip && ibd->fault->skip) {
+		ibd->fault->skip--;
+		return false;
+	}
+	ret = should_fail(&ibd->fault->attr, 1);
+	if (ret) {
+		ibd->fault->skip = ibd->fault->fault_skip;
+		ibd->fault->skip_usec = jiffies +
+			usecs_to_jiffies(ibd->fault->fault_skip_usec);
+	}
+	return ret;
+}
+
+bool hfi1_dbg_should_fault_tx(struct rvt_qp *qp, u32 opcode)
+{
+	struct hfi1_ibdev *ibd = to_idev(qp->ibqp.device);
+
+	if (__hfi1_should_fault(ibd, opcode, HFI1_FAULT_DIR_TX)) {
+		trace_hfi1_fault_opcode(qp, opcode);
+		ibd->fault->n_txfaults[opcode]++;
+		return true;
+	}
+	return false;
+}
+
+bool hfi1_dbg_should_fault_rx(struct hfi1_packet *packet)
+{
+	struct hfi1_ibdev *ibd = &packet->rcd->dd->verbs_dev;
+
+	if (__hfi1_should_fault(ibd, packet->opcode, HFI1_FAULT_DIR_RX)) {
+		trace_hfi1_fault_packet(packet);
+		ibd->fault->n_rxfaults[packet->opcode]++;
+		return true;
+	}
+	return false;
+}