Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1305 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/hfi1/debugfs.c b/drivers/infiniband/hw/hfi1/debugfs.c
new file mode 100644
index 000000000..9f992ae36
--- /dev/null
+++ b/drivers/infiniband/hw/hfi1/debugfs.c
@@ -0,0 +1,1305 @@
+/*
+ * Copyright(c) 2015-2018 Intel Corporation.
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * BSD LICENSE
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *  - Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  - Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *  - Neither the name of Intel Corporation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ratelimit.h>
+#include <linux/fault-inject.h>
+
+#include "hfi.h"
+#include "trace.h"
+#include "debugfs.h"
+#include "device.h"
+#include "qp.h"
+#include "sdma.h"
+#include "fault.h"
+
+static struct dentry *hfi1_dbg_root;
+
+/* wrappers to enforce srcu in seq file */
+ssize_t hfi1_seq_read(struct file *file, char __user *buf, size_t size,
+		      loff_t *ppos)
+{
+	struct dentry *d = file->f_path.dentry;
+	ssize_t r;
+
+	r = debugfs_file_get(d);
+	if (unlikely(r))
+		return r;
+	r = seq_read(file, buf, size, ppos);
+	debugfs_file_put(d);
+	return r;
+}
+
+loff_t hfi1_seq_lseek(struct file *file, loff_t offset, int whence)
+{
+	struct dentry *d = file->f_path.dentry;
+	loff_t r;
+
+	r = debugfs_file_get(d);
+	if (unlikely(r))
+		return r;
+	r = seq_lseek(file, offset, whence);
+	debugfs_file_put(d);
+	return r;
+}
+
+#define private2dd(file) (file_inode(file)->i_private)
+#define private2ppd(file) (file_inode(file)->i_private)
+
+static void *_opcode_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 *_opcode_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 _opcode_stats_seq_stop(struct seq_file *s, void *v)
+{
+}
+
+static int opcode_stats_show(struct seq_file *s, u8 i, u64 packets, u64 bytes)
+{
+	if (!packets && !bytes)
+		return SEQ_SKIP;
+	seq_printf(s, "%02x %llu/%llu\n", i,
+		   (unsigned long long)packets,
+		   (unsigned long long)bytes);
+
+	return 0;
+}
+
+static int _opcode_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);
+	}
+	return opcode_stats_show(s, i, n_packets, n_bytes);
+}
+
+DEBUGFS_SEQ_FILE_OPS(opcode_stats);
+DEBUGFS_SEQ_FILE_OPEN(opcode_stats)
+DEBUGFS_FILE_OPS(opcode_stats);
+
+static void *_tx_opcode_stats_seq_start(struct seq_file *s, loff_t *pos)
+{
+	return _opcode_stats_seq_start(s, pos);
+}
+
+static void *_tx_opcode_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+	return _opcode_stats_seq_next(s, v, pos);
+}
+
+static void _tx_opcode_stats_seq_stop(struct seq_file *s, void *v)
+{
+}
+
+static int _tx_opcode_stats_seq_show(struct seq_file *s, void *v)
+{
+	loff_t *spos = v;
+	loff_t i = *spos;
+	int 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);
+
+	for_each_possible_cpu(j) {
+		struct hfi1_opcode_stats_perctx *s =
+			per_cpu_ptr(dd->tx_opstats, j);
+		n_packets += s->stats[i].n_packets;
+		n_bytes += s->stats[i].n_bytes;
+	}
+	return opcode_stats_show(s, i, n_packets, n_bytes);
+}
+
+DEBUGFS_SEQ_FILE_OPS(tx_opcode_stats);
+DEBUGFS_SEQ_FILE_OPEN(tx_opcode_stats)
+DEBUGFS_FILE_OPS(tx_opcode_stats);
+
+static void *_ctx_stats_seq_start(struct seq_file *s, loff_t *pos)
+{
+	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
+	struct hfi1_devdata *dd = dd_from_dev(ibd);
+
+	if (!*pos)
+		return SEQ_START_TOKEN;
+	if (*pos >= dd->first_dyn_alloc_ctxt)
+		return NULL;
+	return pos;
+}
+
+static void *_ctx_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
+	struct hfi1_devdata *dd = dd_from_dev(ibd);
+
+	if (v == SEQ_START_TOKEN)
+		return pos;
+
+	++*pos;
+	if (*pos >= dd->first_dyn_alloc_ctxt)
+		return NULL;
+	return pos;
+}
+
+static void _ctx_stats_seq_stop(struct seq_file *s, void *v)
+{
+	/* nothing allocated */
+}
+
+static int _ctx_stats_seq_show(struct seq_file *s, void *v)
+{
+	loff_t *spos;
+	loff_t i, j;
+	u64 n_packets = 0;
+	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
+	struct hfi1_devdata *dd = dd_from_dev(ibd);
+	struct hfi1_ctxtdata *rcd;
+
+	if (v == SEQ_START_TOKEN) {
+		seq_puts(s, "Ctx:npkts\n");
+		return 0;
+	}
+
+	spos = v;
+	i = *spos;
+
+	rcd = hfi1_rcd_get_by_index_safe(dd, i);
+	if (!rcd)
+		return SEQ_SKIP;
+
+	for (j = 0; j < ARRAY_SIZE(rcd->opstats->stats); j++)
+		n_packets += rcd->opstats->stats[j].n_packets;
+
+	hfi1_rcd_put(rcd);
+
+	if (!n_packets)
+		return SEQ_SKIP;
+
+	seq_printf(s, "  %llu:%llu\n", i, n_packets);
+	return 0;
+}
+
+DEBUGFS_SEQ_FILE_OPS(ctx_stats);
+DEBUGFS_SEQ_FILE_OPEN(ctx_stats)
+DEBUGFS_FILE_OPS(ctx_stats);
+
+static void *_qp_stats_seq_start(struct seq_file *s, loff_t *pos)
+	__acquires(RCU)
+{
+	struct rvt_qp_iter *iter;
+	loff_t n = *pos;
+
+	iter = rvt_qp_iter_init(s->private, 0, NULL);
+
+	/* stop calls rcu_read_unlock */
+	rcu_read_lock();
+
+	if (!iter)
+		return NULL;
+
+	do {
+		if (rvt_qp_iter_next(iter)) {
+			kfree(iter);
+			return NULL;
+		}
+	} while (n--);
+
+	return iter;
+}
+
+static void *_qp_stats_seq_next(struct seq_file *s, void *iter_ptr,
+				loff_t *pos)
+	__must_hold(RCU)
+{
+	struct rvt_qp_iter *iter = iter_ptr;
+
+	(*pos)++;
+
+	if (rvt_qp_iter_next(iter)) {
+		kfree(iter);
+		return NULL;
+	}
+
+	return iter;
+}
+
+static void _qp_stats_seq_stop(struct seq_file *s, void *iter_ptr)
+	__releases(RCU)
+{
+	rcu_read_unlock();
+}
+
+static int _qp_stats_seq_show(struct seq_file *s, void *iter_ptr)
+{
+	struct rvt_qp_iter *iter = iter_ptr;
+
+	if (!iter)
+		return 0;
+
+	qp_iter_print(s, iter);
+
+	return 0;
+}
+
+DEBUGFS_SEQ_FILE_OPS(qp_stats);
+DEBUGFS_SEQ_FILE_OPEN(qp_stats)
+DEBUGFS_FILE_OPS(qp_stats);
+
+static void *_sdes_seq_start(struct seq_file *s, loff_t *pos)
+{
+	struct hfi1_ibdev *ibd;
+	struct hfi1_devdata *dd;
+
+	ibd = (struct hfi1_ibdev *)s->private;
+	dd = dd_from_dev(ibd);
+	if (!dd->per_sdma || *pos >= dd->num_sdma)
+		return NULL;
+	return pos;
+}
+
+static void *_sdes_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
+	struct hfi1_devdata *dd = dd_from_dev(ibd);
+
+	++*pos;
+	if (!dd->per_sdma || *pos >= dd->num_sdma)
+		return NULL;
+	return pos;
+}
+
+static void _sdes_seq_stop(struct seq_file *s, void *v)
+{
+}
+
+static int _sdes_seq_show(struct seq_file *s, void *v)
+{
+	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
+	struct hfi1_devdata *dd = dd_from_dev(ibd);
+	loff_t *spos = v;
+	loff_t i = *spos;
+
+	sdma_seqfile_dump_sde(s, &dd->per_sdma[i]);
+	return 0;
+}
+
+DEBUGFS_SEQ_FILE_OPS(sdes);
+DEBUGFS_SEQ_FILE_OPEN(sdes)
+DEBUGFS_FILE_OPS(sdes);
+
+static void *_rcds_seq_start(struct seq_file *s, loff_t *pos)
+{
+	struct hfi1_ibdev *ibd;
+	struct hfi1_devdata *dd;
+
+	ibd = (struct hfi1_ibdev *)s->private;
+	dd = dd_from_dev(ibd);
+	if (!dd->rcd || *pos >= dd->n_krcv_queues)
+		return NULL;
+	return pos;
+}
+
+static void *_rcds_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
+	struct hfi1_devdata *dd = dd_from_dev(ibd);
+
+	++*pos;
+	if (!dd->rcd || *pos >= dd->n_krcv_queues)
+		return NULL;
+	return pos;
+}
+
+static void _rcds_seq_stop(struct seq_file *s, void *v)
+{
+}
+
+static int _rcds_seq_show(struct seq_file *s, void *v)
+{
+	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
+	struct hfi1_devdata *dd = dd_from_dev(ibd);
+	struct hfi1_ctxtdata *rcd;
+	loff_t *spos = v;
+	loff_t i = *spos;
+
+	rcd = hfi1_rcd_get_by_index_safe(dd, i);
+	if (rcd)
+		seqfile_dump_rcd(s, rcd);
+	hfi1_rcd_put(rcd);
+	return 0;
+}
+
+DEBUGFS_SEQ_FILE_OPS(rcds);
+DEBUGFS_SEQ_FILE_OPEN(rcds)
+DEBUGFS_FILE_OPS(rcds);
+
+/* read the per-device counters */
+static ssize_t dev_counters_read(struct file *file, char __user *buf,
+				 size_t count, loff_t *ppos)
+{
+	u64 *counters;
+	size_t avail;
+	struct hfi1_devdata *dd;
+	ssize_t rval;
+
+	dd = private2dd(file);
+	avail = hfi1_read_cntrs(dd, NULL, &counters);
+	rval =  simple_read_from_buffer(buf, count, ppos, counters, avail);
+	return rval;
+}
+
+/* read the per-device counters */
+static ssize_t dev_names_read(struct file *file, char __user *buf,
+			      size_t count, loff_t *ppos)
+{
+	char *names;
+	size_t avail;
+	struct hfi1_devdata *dd;
+	ssize_t rval;
+
+	dd = private2dd(file);
+	avail = hfi1_read_cntrs(dd, &names, NULL);
+	rval =  simple_read_from_buffer(buf, count, ppos, names, avail);
+	return rval;
+}
+
+struct counter_info {
+	char *name;
+	const struct file_operations ops;
+};
+
+/*
+ * Could use file_inode(file)->i_ino to figure out which file,
+ * instead of separate routine for each, but for now, this works...
+ */
+
+/* read the per-port names (same for each port) */
+static ssize_t portnames_read(struct file *file, char __user *buf,
+			      size_t count, loff_t *ppos)
+{
+	char *names;
+	size_t avail;
+	struct hfi1_devdata *dd;
+	ssize_t rval;
+
+	dd = private2dd(file);
+	avail = hfi1_read_portcntrs(dd->pport, &names, NULL);
+	rval = simple_read_from_buffer(buf, count, ppos, names, avail);
+	return rval;
+}
+
+/* read the per-port counters */
+static ssize_t portcntrs_debugfs_read(struct file *file, char __user *buf,
+				      size_t count, loff_t *ppos)
+{
+	u64 *counters;
+	size_t avail;
+	struct hfi1_pportdata *ppd;
+	ssize_t rval;
+
+	ppd = private2ppd(file);
+	avail = hfi1_read_portcntrs(ppd, NULL, &counters);
+	rval = simple_read_from_buffer(buf, count, ppos, counters, avail);
+	return rval;
+}
+
+static void check_dyn_flag(u64 scratch0, char *p, int size, int *used,
+			   int this_hfi, int hfi, u32 flag, const char *what)
+{
+	u32 mask;
+
+	mask = flag << (hfi ? CR_DYN_SHIFT : 0);
+	if (scratch0 & mask) {
+		*used += scnprintf(p + *used, size - *used,
+				   "  0x%08x - HFI%d %s in use, %s device\n",
+				   mask, hfi, what,
+				   this_hfi == hfi ? "this" : "other");
+	}
+}
+
+static ssize_t asic_flags_read(struct file *file, char __user *buf,
+			       size_t count, loff_t *ppos)
+{
+	struct hfi1_pportdata *ppd;
+	struct hfi1_devdata *dd;
+	u64 scratch0;
+	char *tmp;
+	int ret = 0;
+	int size;
+	int used;
+	int i;
+
+	ppd = private2ppd(file);
+	dd = ppd->dd;
+	size = PAGE_SIZE;
+	used = 0;
+	tmp = kmalloc(size, GFP_KERNEL);
+	if (!tmp)
+		return -ENOMEM;
+
+	scratch0 = read_csr(dd, ASIC_CFG_SCRATCH);
+	used += scnprintf(tmp + used, size - used,
+			  "Resource flags: 0x%016llx\n", scratch0);
+
+	/* check permanent flag */
+	if (scratch0 & CR_THERM_INIT) {
+		used += scnprintf(tmp + used, size - used,
+				  "  0x%08x - thermal monitoring initialized\n",
+				  (u32)CR_THERM_INIT);
+	}
+
+	/* check each dynamic flag on each HFI */
+	for (i = 0; i < 2; i++) {
+		check_dyn_flag(scratch0, tmp, size, &used, dd->hfi1_id, i,
+			       CR_SBUS, "SBus");
+		check_dyn_flag(scratch0, tmp, size, &used, dd->hfi1_id, i,
+			       CR_EPROM, "EPROM");
+		check_dyn_flag(scratch0, tmp, size, &used, dd->hfi1_id, i,
+			       CR_I2C1, "i2c chain 1");
+		check_dyn_flag(scratch0, tmp, size, &used, dd->hfi1_id, i,
+			       CR_I2C2, "i2c chain 2");
+	}
+	used += scnprintf(tmp + used, size - used, "Write bits to clear\n");
+
+	ret = simple_read_from_buffer(buf, count, ppos, tmp, used);
+	kfree(tmp);
+	return ret;
+}
+
+static ssize_t asic_flags_write(struct file *file, const char __user *buf,
+				size_t count, loff_t *ppos)
+{
+	struct hfi1_pportdata *ppd;
+	struct hfi1_devdata *dd;
+	char *buff;
+	int ret;
+	unsigned long long value;
+	u64 scratch0;
+	u64 clear;
+
+	ppd = private2ppd(file);
+	dd = ppd->dd;
+
+	/* zero terminate and read the expected integer */
+	buff = memdup_user_nul(buf, count);
+	if (IS_ERR(buff))
+		return PTR_ERR(buff);
+
+	ret = kstrtoull(buff, 0, &value);
+	if (ret)
+		goto do_free;
+	clear = value;
+
+	/* obtain exclusive access */
+	mutex_lock(&dd->asic_data->asic_resource_mutex);
+	acquire_hw_mutex(dd);
+
+	scratch0 = read_csr(dd, ASIC_CFG_SCRATCH);
+	scratch0 &= ~clear;
+	write_csr(dd, ASIC_CFG_SCRATCH, scratch0);
+	/* force write to be visible to other HFI on another OS */
+	(void)read_csr(dd, ASIC_CFG_SCRATCH);
+
+	release_hw_mutex(dd);
+	mutex_unlock(&dd->asic_data->asic_resource_mutex);
+
+	/* return the number of bytes written */
+	ret = count;
+
+ do_free:
+	kfree(buff);
+	return ret;
+}
+
+/* read the dc8051 memory */
+static ssize_t dc8051_memory_read(struct file *file, char __user *buf,
+				  size_t count, loff_t *ppos)
+{
+	struct hfi1_pportdata *ppd = private2ppd(file);
+	ssize_t rval;
+	void *tmp;
+	loff_t start, end;
+
+	/* the checks below expect the position to be positive */
+	if (*ppos < 0)
+		return -EINVAL;
+
+	tmp = kzalloc(DC8051_DATA_MEM_SIZE, GFP_KERNEL);
+	if (!tmp)
+		return -ENOMEM;
+
+	/*
+	 * Fill in the requested portion of the temporary buffer from the
+	 * 8051 memory.  The 8051 memory read is done in terms of 8 bytes.
+	 * Adjust start and end to fit.  Skip reading anything if out of
+	 * range.
+	 */
+	start = *ppos & ~0x7;	/* round down */
+	if (start < DC8051_DATA_MEM_SIZE) {
+		end = (*ppos + count + 7) & ~0x7; /* round up */
+		if (end > DC8051_DATA_MEM_SIZE)
+			end = DC8051_DATA_MEM_SIZE;
+		rval = read_8051_data(ppd->dd, start, end - start,
+				      (u64 *)(tmp + start));
+		if (rval)
+			goto done;
+	}
+
+	rval = simple_read_from_buffer(buf, count, ppos, tmp,
+				       DC8051_DATA_MEM_SIZE);
+done:
+	kfree(tmp);
+	return rval;
+}
+
+static ssize_t debugfs_lcb_read(struct file *file, char __user *buf,
+				size_t count, loff_t *ppos)
+{
+	struct hfi1_pportdata *ppd = private2ppd(file);
+	struct hfi1_devdata *dd = ppd->dd;
+	unsigned long total, csr_off;
+	u64 data;
+
+	if (*ppos < 0)
+		return -EINVAL;
+	/* only read 8 byte quantities */
+	if ((count % 8) != 0)
+		return -EINVAL;
+	/* offset must be 8-byte aligned */
+	if ((*ppos % 8) != 0)
+		return -EINVAL;
+	/* do nothing if out of range or zero count */
+	if (*ppos >= (LCB_END - LCB_START) || !count)
+		return 0;
+	/* reduce count if needed */
+	if (*ppos + count > LCB_END - LCB_START)
+		count = (LCB_END - LCB_START) - *ppos;
+
+	csr_off = LCB_START + *ppos;
+	for (total = 0; total < count; total += 8, csr_off += 8) {
+		if (read_lcb_csr(dd, csr_off, (u64 *)&data))
+			break; /* failed */
+		if (put_user(data, (unsigned long __user *)(buf + total)))
+			break;
+	}
+	*ppos += total;
+	return total;
+}
+
+static ssize_t debugfs_lcb_write(struct file *file, const char __user *buf,
+				 size_t count, loff_t *ppos)
+{
+	struct hfi1_pportdata *ppd = private2ppd(file);
+	struct hfi1_devdata *dd = ppd->dd;
+	unsigned long total, csr_off, data;
+
+	if (*ppos < 0)
+		return -EINVAL;
+	/* only write 8 byte quantities */
+	if ((count % 8) != 0)
+		return -EINVAL;
+	/* offset must be 8-byte aligned */
+	if ((*ppos % 8) != 0)
+		return -EINVAL;
+	/* do nothing if out of range or zero count */
+	if (*ppos >= (LCB_END - LCB_START) || !count)
+		return 0;
+	/* reduce count if needed */
+	if (*ppos + count > LCB_END - LCB_START)
+		count = (LCB_END - LCB_START) - *ppos;
+
+	csr_off = LCB_START + *ppos;
+	for (total = 0; total < count; total += 8, csr_off += 8) {
+		if (get_user(data, (unsigned long __user *)(buf + total)))
+			break;
+		if (write_lcb_csr(dd, csr_off, data))
+			break; /* failed */
+	}
+	*ppos += total;
+	return total;
+}
+
+/*
+ * read the per-port QSFP data for ppd
+ */
+static ssize_t qsfp_debugfs_dump(struct file *file, char __user *buf,
+				 size_t count, loff_t *ppos)
+{
+	struct hfi1_pportdata *ppd;
+	char *tmp;
+	int ret;
+
+	ppd = private2ppd(file);
+	tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
+	if (!tmp)
+		return -ENOMEM;
+
+	ret = qsfp_dump(ppd, tmp, PAGE_SIZE);
+	if (ret > 0)
+		ret = simple_read_from_buffer(buf, count, ppos, tmp, ret);
+	kfree(tmp);
+	return ret;
+}
+
+/* Do an i2c write operation on the chain for the given HFI. */
+static ssize_t __i2c_debugfs_write(struct file *file, const char __user *buf,
+				   size_t count, loff_t *ppos, u32 target)
+{
+	struct hfi1_pportdata *ppd;
+	char *buff;
+	int ret;
+	int i2c_addr;
+	int offset;
+	int total_written;
+
+	ppd = private2ppd(file);
+
+	/* byte offset format: [offsetSize][i2cAddr][offsetHigh][offsetLow] */
+	i2c_addr = (*ppos >> 16) & 0xffff;
+	offset = *ppos & 0xffff;
+
+	/* explicitly reject invalid address 0 to catch cp and cat */
+	if (i2c_addr == 0)
+		return -EINVAL;
+
+	buff = memdup_user(buf, count);
+	if (IS_ERR(buff))
+		return PTR_ERR(buff);
+
+	total_written = i2c_write(ppd, target, i2c_addr, offset, buff, count);
+	if (total_written < 0) {
+		ret = total_written;
+		goto _free;
+	}
+
+	*ppos += total_written;
+
+	ret = total_written;
+
+ _free:
+	kfree(buff);
+	return ret;
+}
+
+/* Do an i2c write operation on chain for HFI 0. */
+static ssize_t i2c1_debugfs_write(struct file *file, const char __user *buf,
+				  size_t count, loff_t *ppos)
+{
+	return __i2c_debugfs_write(file, buf, count, ppos, 0);
+}
+
+/* Do an i2c write operation on chain for HFI 1. */
+static ssize_t i2c2_debugfs_write(struct file *file, const char __user *buf,
+				  size_t count, loff_t *ppos)
+{
+	return __i2c_debugfs_write(file, buf, count, ppos, 1);
+}
+
+/* Do an i2c read operation on the chain for the given HFI. */
+static ssize_t __i2c_debugfs_read(struct file *file, char __user *buf,
+				  size_t count, loff_t *ppos, u32 target)
+{
+	struct hfi1_pportdata *ppd;
+	char *buff;
+	int ret;
+	int i2c_addr;
+	int offset;
+	int total_read;
+
+	ppd = private2ppd(file);
+
+	/* byte offset format: [offsetSize][i2cAddr][offsetHigh][offsetLow] */
+	i2c_addr = (*ppos >> 16) & 0xffff;
+	offset = *ppos & 0xffff;
+
+	/* explicitly reject invalid address 0 to catch cp and cat */
+	if (i2c_addr == 0)
+		return -EINVAL;
+
+	buff = kmalloc(count, GFP_KERNEL);
+	if (!buff)
+		return -ENOMEM;
+
+	total_read = i2c_read(ppd, target, i2c_addr, offset, buff, count);
+	if (total_read < 0) {
+		ret = total_read;
+		goto _free;
+	}
+
+	*ppos += total_read;
+
+	ret = copy_to_user(buf, buff, total_read);
+	if (ret > 0) {
+		ret = -EFAULT;
+		goto _free;
+	}
+
+	ret = total_read;
+
+ _free:
+	kfree(buff);
+	return ret;
+}
+
+/* Do an i2c read operation on chain for HFI 0. */
+static ssize_t i2c1_debugfs_read(struct file *file, char __user *buf,
+				 size_t count, loff_t *ppos)
+{
+	return __i2c_debugfs_read(file, buf, count, ppos, 0);
+}
+
+/* Do an i2c read operation on chain for HFI 1. */
+static ssize_t i2c2_debugfs_read(struct file *file, char __user *buf,
+				 size_t count, loff_t *ppos)
+{
+	return __i2c_debugfs_read(file, buf, count, ppos, 1);
+}
+
+/* Do a QSFP write operation on the i2c chain for the given HFI. */
+static ssize_t __qsfp_debugfs_write(struct file *file, const char __user *buf,
+				    size_t count, loff_t *ppos, u32 target)
+{
+	struct hfi1_pportdata *ppd;
+	char *buff;
+	int ret;
+	int total_written;
+
+	if (*ppos + count > QSFP_PAGESIZE * 4) /* base page + page00-page03 */
+		return -EINVAL;
+
+	ppd = private2ppd(file);
+
+	buff = memdup_user(buf, count);
+	if (IS_ERR(buff))
+		return PTR_ERR(buff);
+
+	total_written = qsfp_write(ppd, target, *ppos, buff, count);
+	if (total_written < 0) {
+		ret = total_written;
+		goto _free;
+	}
+
+	*ppos += total_written;
+
+	ret = total_written;
+
+ _free:
+	kfree(buff);
+	return ret;
+}
+
+/* Do a QSFP write operation on i2c chain for HFI 0. */
+static ssize_t qsfp1_debugfs_write(struct file *file, const char __user *buf,
+				   size_t count, loff_t *ppos)
+{
+	return __qsfp_debugfs_write(file, buf, count, ppos, 0);
+}
+
+/* Do a QSFP write operation on i2c chain for HFI 1. */
+static ssize_t qsfp2_debugfs_write(struct file *file, const char __user *buf,
+				   size_t count, loff_t *ppos)
+{
+	return __qsfp_debugfs_write(file, buf, count, ppos, 1);
+}
+
+/* Do a QSFP read operation on the i2c chain for the given HFI. */
+static ssize_t __qsfp_debugfs_read(struct file *file, char __user *buf,
+				   size_t count, loff_t *ppos, u32 target)
+{
+	struct hfi1_pportdata *ppd;
+	char *buff;
+	int ret;
+	int total_read;
+
+	if (*ppos + count > QSFP_PAGESIZE * 4) { /* base page + page00-page03 */
+		ret = -EINVAL;
+		goto _return;
+	}
+
+	ppd = private2ppd(file);
+
+	buff = kmalloc(count, GFP_KERNEL);
+	if (!buff) {
+		ret = -ENOMEM;
+		goto _return;
+	}
+
+	total_read = qsfp_read(ppd, target, *ppos, buff, count);
+	if (total_read < 0) {
+		ret = total_read;
+		goto _free;
+	}
+
+	*ppos += total_read;
+
+	ret = copy_to_user(buf, buff, total_read);
+	if (ret > 0) {
+		ret = -EFAULT;
+		goto _free;
+	}
+
+	ret = total_read;
+
+ _free:
+	kfree(buff);
+ _return:
+	return ret;
+}
+
+/* Do a QSFP read operation on i2c chain for HFI 0. */
+static ssize_t qsfp1_debugfs_read(struct file *file, char __user *buf,
+				  size_t count, loff_t *ppos)
+{
+	return __qsfp_debugfs_read(file, buf, count, ppos, 0);
+}
+
+/* Do a QSFP read operation on i2c chain for HFI 1. */
+static ssize_t qsfp2_debugfs_read(struct file *file, char __user *buf,
+				  size_t count, loff_t *ppos)
+{
+	return __qsfp_debugfs_read(file, buf, count, ppos, 1);
+}
+
+static int __i2c_debugfs_open(struct inode *in, struct file *fp, u32 target)
+{
+	struct hfi1_pportdata *ppd;
+	int ret;
+
+	if (!try_module_get(THIS_MODULE))
+		return -ENODEV;
+
+	ppd = private2ppd(fp);
+
+	ret = acquire_chip_resource(ppd->dd, i2c_target(target), 0);
+	if (ret) /* failed - release the module */
+		module_put(THIS_MODULE);
+
+	return ret;
+}
+
+static int i2c1_debugfs_open(struct inode *in, struct file *fp)
+{
+	return __i2c_debugfs_open(in, fp, 0);
+}
+
+static int i2c2_debugfs_open(struct inode *in, struct file *fp)
+{
+	return __i2c_debugfs_open(in, fp, 1);
+}
+
+static int __i2c_debugfs_release(struct inode *in, struct file *fp, u32 target)
+{
+	struct hfi1_pportdata *ppd;
+
+	ppd = private2ppd(fp);
+
+	release_chip_resource(ppd->dd, i2c_target(target));
+	module_put(THIS_MODULE);
+
+	return 0;
+}
+
+static int i2c1_debugfs_release(struct inode *in, struct file *fp)
+{
+	return __i2c_debugfs_release(in, fp, 0);
+}
+
+static int i2c2_debugfs_release(struct inode *in, struct file *fp)
+{
+	return __i2c_debugfs_release(in, fp, 1);
+}
+
+static int __qsfp_debugfs_open(struct inode *in, struct file *fp, u32 target)
+{
+	struct hfi1_pportdata *ppd;
+	int ret;
+
+	if (!try_module_get(THIS_MODULE))
+		return -ENODEV;
+
+	ppd = private2ppd(fp);
+
+	ret = acquire_chip_resource(ppd->dd, i2c_target(target), 0);
+	if (ret) /* failed - release the module */
+		module_put(THIS_MODULE);
+
+	return ret;
+}
+
+static int qsfp1_debugfs_open(struct inode *in, struct file *fp)
+{
+	return __qsfp_debugfs_open(in, fp, 0);
+}
+
+static int qsfp2_debugfs_open(struct inode *in, struct file *fp)
+{
+	return __qsfp_debugfs_open(in, fp, 1);
+}
+
+static int __qsfp_debugfs_release(struct inode *in, struct file *fp, u32 target)
+{
+	struct hfi1_pportdata *ppd;
+
+	ppd = private2ppd(fp);
+
+	release_chip_resource(ppd->dd, i2c_target(target));
+	module_put(THIS_MODULE);
+
+	return 0;
+}
+
+static int qsfp1_debugfs_release(struct inode *in, struct file *fp)
+{
+	return __qsfp_debugfs_release(in, fp, 0);
+}
+
+static int qsfp2_debugfs_release(struct inode *in, struct file *fp)
+{
+	return __qsfp_debugfs_release(in, fp, 1);
+}
+
+#define DEBUGFS_OPS(nm, readroutine, writeroutine)	\
+{ \
+	.name = nm, \
+	.ops = { \
+		.read = readroutine, \
+		.write = writeroutine, \
+		.llseek = generic_file_llseek, \
+	}, \
+}
+
+#define DEBUGFS_XOPS(nm, readf, writef, openf, releasef) \
+{ \
+	.name = nm, \
+	.ops = { \
+		.read = readf, \
+		.write = writef, \
+		.llseek = generic_file_llseek, \
+		.open = openf, \
+		.release = releasef \
+	}, \
+}
+
+static const struct counter_info cntr_ops[] = {
+	DEBUGFS_OPS("counter_names", dev_names_read, NULL),
+	DEBUGFS_OPS("counters", dev_counters_read, NULL),
+	DEBUGFS_OPS("portcounter_names", portnames_read, NULL),
+};
+
+static const struct counter_info port_cntr_ops[] = {
+	DEBUGFS_OPS("port%dcounters", portcntrs_debugfs_read, NULL),
+	DEBUGFS_XOPS("i2c1", i2c1_debugfs_read, i2c1_debugfs_write,
+		     i2c1_debugfs_open, i2c1_debugfs_release),
+	DEBUGFS_XOPS("i2c2", i2c2_debugfs_read, i2c2_debugfs_write,
+		     i2c2_debugfs_open, i2c2_debugfs_release),
+	DEBUGFS_OPS("qsfp_dump%d", qsfp_debugfs_dump, NULL),
+	DEBUGFS_XOPS("qsfp1", qsfp1_debugfs_read, qsfp1_debugfs_write,
+		     qsfp1_debugfs_open, qsfp1_debugfs_release),
+	DEBUGFS_XOPS("qsfp2", qsfp2_debugfs_read, qsfp2_debugfs_write,
+		     qsfp2_debugfs_open, qsfp2_debugfs_release),
+	DEBUGFS_OPS("asic_flags", asic_flags_read, asic_flags_write),
+	DEBUGFS_OPS("dc8051_memory", dc8051_memory_read, NULL),
+	DEBUGFS_OPS("lcb", debugfs_lcb_read, debugfs_lcb_write),
+};
+
+static void *_sdma_cpu_list_seq_start(struct seq_file *s, loff_t *pos)
+{
+	if (*pos >= num_online_cpus())
+		return NULL;
+
+	return pos;
+}
+
+static void *_sdma_cpu_list_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+	++*pos;
+	if (*pos >= num_online_cpus())
+		return NULL;
+
+	return pos;
+}
+
+static void _sdma_cpu_list_seq_stop(struct seq_file *s, void *v)
+{
+	/* nothing allocated */
+}
+
+static int _sdma_cpu_list_seq_show(struct seq_file *s, void *v)
+{
+	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
+	struct hfi1_devdata *dd = dd_from_dev(ibd);
+	loff_t *spos = v;
+	loff_t i = *spos;
+
+	sdma_seqfile_dump_cpu_list(s, dd, (unsigned long)i);
+	return 0;
+}
+
+DEBUGFS_SEQ_FILE_OPS(sdma_cpu_list);
+DEBUGFS_SEQ_FILE_OPEN(sdma_cpu_list)
+DEBUGFS_FILE_OPS(sdma_cpu_list);
+
+void hfi1_dbg_ibdev_init(struct hfi1_ibdev *ibd)
+{
+	char name[sizeof("port0counters") + 1];
+	char link[10];
+	struct hfi1_devdata *dd = dd_from_dev(ibd);
+	struct hfi1_pportdata *ppd;
+	int unit = dd->unit;
+	int i, j;
+
+	if (!hfi1_dbg_root)
+		return;
+	snprintf(name, sizeof(name), "%s_%d", class_name(), unit);
+	snprintf(link, sizeof(link), "%d", unit);
+	ibd->hfi1_ibdev_dbg = debugfs_create_dir(name, hfi1_dbg_root);
+	if (!ibd->hfi1_ibdev_dbg) {
+		pr_warn("create of %s failed\n", name);
+		return;
+	}
+	ibd->hfi1_ibdev_link =
+		debugfs_create_symlink(link, hfi1_dbg_root, name);
+	if (!ibd->hfi1_ibdev_link) {
+		pr_warn("create of %s symlink failed\n", name);
+		return;
+	}
+	DEBUGFS_SEQ_FILE_CREATE(opcode_stats, ibd->hfi1_ibdev_dbg, ibd);
+	DEBUGFS_SEQ_FILE_CREATE(tx_opcode_stats, ibd->hfi1_ibdev_dbg, ibd);
+	DEBUGFS_SEQ_FILE_CREATE(ctx_stats, ibd->hfi1_ibdev_dbg, ibd);
+	DEBUGFS_SEQ_FILE_CREATE(qp_stats, ibd->hfi1_ibdev_dbg, ibd);
+	DEBUGFS_SEQ_FILE_CREATE(sdes, ibd->hfi1_ibdev_dbg, ibd);
+	DEBUGFS_SEQ_FILE_CREATE(rcds, ibd->hfi1_ibdev_dbg, ibd);
+	DEBUGFS_SEQ_FILE_CREATE(sdma_cpu_list, ibd->hfi1_ibdev_dbg, ibd);
+	/* dev counter files */
+	for (i = 0; i < ARRAY_SIZE(cntr_ops); i++)
+		DEBUGFS_FILE_CREATE(cntr_ops[i].name,
+				    ibd->hfi1_ibdev_dbg,
+				    dd,
+				    &cntr_ops[i].ops, S_IRUGO);
+	/* per port files */
+	for (ppd = dd->pport, j = 0; j < dd->num_pports; j++, ppd++)
+		for (i = 0; i < ARRAY_SIZE(port_cntr_ops); i++) {
+			snprintf(name,
+				 sizeof(name),
+				 port_cntr_ops[i].name,
+				 j + 1);
+			DEBUGFS_FILE_CREATE(name,
+					    ibd->hfi1_ibdev_dbg,
+					    ppd,
+					    &port_cntr_ops[i].ops,
+					    !port_cntr_ops[i].ops.write ?
+					    S_IRUGO : S_IRUGO | S_IWUSR);
+		}
+
+	hfi1_fault_init_debugfs(ibd);
+}
+
+void hfi1_dbg_ibdev_exit(struct hfi1_ibdev *ibd)
+{
+	if (!hfi1_dbg_root)
+		goto out;
+	hfi1_fault_exit_debugfs(ibd);
+	debugfs_remove(ibd->hfi1_ibdev_link);
+	debugfs_remove_recursive(ibd->hfi1_ibdev_dbg);
+out:
+	ibd->hfi1_ibdev_dbg = NULL;
+}
+
+/*
+ * driver stats field names, one line per stat, single string.  Used by
+ * programs like hfistats to print the stats in a way which works for
+ * different versions of drivers, without changing program source.
+ * if hfi1_ib_stats changes, this needs to change.  Names need to be
+ * 12 chars or less (w/o newline), for proper display by hfistats utility.
+ */
+static const char * const hfi1_statnames[] = {
+	/* must be element 0*/
+	"KernIntr",
+	"ErrorIntr",
+	"Tx_Errs",
+	"Rcv_Errs",
+	"H/W_Errs",
+	"NoPIOBufs",
+	"CtxtsOpen",
+	"RcvLen_Errs",
+	"EgrBufFull",
+	"EgrHdrFull"
+};
+
+static void *_driver_stats_names_seq_start(struct seq_file *s, loff_t *pos)
+{
+	if (*pos >= ARRAY_SIZE(hfi1_statnames))
+		return NULL;
+	return pos;
+}
+
+static void *_driver_stats_names_seq_next(
+	struct seq_file *s,
+	void *v,
+	loff_t *pos)
+{
+	++*pos;
+	if (*pos >= ARRAY_SIZE(hfi1_statnames))
+		return NULL;
+	return pos;
+}
+
+static void _driver_stats_names_seq_stop(struct seq_file *s, void *v)
+{
+}
+
+static int _driver_stats_names_seq_show(struct seq_file *s, void *v)
+{
+	loff_t *spos = v;
+
+	seq_printf(s, "%s\n", hfi1_statnames[*spos]);
+	return 0;
+}
+
+DEBUGFS_SEQ_FILE_OPS(driver_stats_names);
+DEBUGFS_SEQ_FILE_OPEN(driver_stats_names)
+DEBUGFS_FILE_OPS(driver_stats_names);
+
+static void *_driver_stats_seq_start(struct seq_file *s, loff_t *pos)
+{
+	if (*pos >= ARRAY_SIZE(hfi1_statnames))
+		return NULL;
+	return pos;
+}
+
+static void *_driver_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+	++*pos;
+	if (*pos >= ARRAY_SIZE(hfi1_statnames))
+		return NULL;
+	return pos;
+}
+
+static void _driver_stats_seq_stop(struct seq_file *s, void *v)
+{
+}
+
+static u64 hfi1_sps_ints(void)
+{
+	unsigned long flags;
+	struct hfi1_devdata *dd;
+	u64 sps_ints = 0;
+
+	spin_lock_irqsave(&hfi1_devs_lock, flags);
+	list_for_each_entry(dd, &hfi1_dev_list, list) {
+		sps_ints += get_all_cpu_total(dd->int_counter);
+	}
+	spin_unlock_irqrestore(&hfi1_devs_lock, flags);
+	return sps_ints;
+}
+
+static int _driver_stats_seq_show(struct seq_file *s, void *v)
+{
+	loff_t *spos = v;
+	char *buffer;
+	u64 *stats = (u64 *)&hfi1_stats;
+	size_t sz = seq_get_buf(s, &buffer);
+
+	if (sz < sizeof(u64))
+		return SEQ_SKIP;
+	/* special case for interrupts */
+	if (*spos == 0)
+		*(u64 *)buffer = hfi1_sps_ints();
+	else
+		*(u64 *)buffer = stats[*spos];
+	seq_commit(s,  sizeof(u64));
+	return 0;
+}
+
+DEBUGFS_SEQ_FILE_OPS(driver_stats);
+DEBUGFS_SEQ_FILE_OPEN(driver_stats)
+DEBUGFS_FILE_OPS(driver_stats);
+
+void hfi1_dbg_init(void)
+{
+	hfi1_dbg_root  = debugfs_create_dir(DRIVER_NAME, NULL);
+	if (!hfi1_dbg_root)
+		pr_warn("init of debugfs failed\n");
+	DEBUGFS_SEQ_FILE_CREATE(driver_stats_names, hfi1_dbg_root, NULL);
+	DEBUGFS_SEQ_FILE_CREATE(driver_stats, hfi1_dbg_root, NULL);
+}
+
+void hfi1_dbg_exit(void)
+{
+	debugfs_remove_recursive(hfi1_dbg_root);
+	hfi1_dbg_root = NULL;
+}