IB/qib: Convert opcode counters to per-context

This fix changes the opcode relative counters for receive to per
context.

Profiling has shown that when mulitple contexts are being used there
is a lot of cache activity associated with these counters.

The code formerly kept these counters per port, but only provided the
interface to read per HCA.  This patch converts the read of counters
to per HCA and adds the debugfs hooks to be able to read the file as a
sequence of opcodes.

Reviewed-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 166 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/qib/qib_debugfs.c b/drivers/infiniband/hw/qib/qib_debugfs.c
new file mode 100644
index 000000000000..47d01164cc91
--- /dev/null
+++ b/drivers/infiniband/hw/qib/qib_debugfs.c
@@ -0,0 +1,166 @@
+#ifdef CONFIG_DEBUG_FS
+/*
+ * Copyright (c) 2013 Intel Corporation.  All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     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.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/kernel.h>
+#include <linux/export.h>
+
+#include "qib.h"
+#include "qib_verbs.h"
+#include "qib_debugfs.h"
+
+static struct dentry *qib_dbg_root;
+
+#define DEBUGFS_FILE(name) \
+static const struct seq_operations _##name##_seq_ops = { \
+        .start = _##name##_seq_start, \
+        .next  = _##name##_seq_next, \
+        .stop  = _##name##_seq_stop, \
+        .show  = _##name##_seq_show \
+}; \
+static int _##name##_open(struct inode *inode, struct file *s) \
+{ \
+        struct seq_file *seq; \
+        int ret; \
+        ret =  seq_open(s, &_##name##_seq_ops); \
+        if (ret) \
+                return ret; \
+        seq = s->private_data; \
+        seq->private = inode->i_private; \
+        return 0; \
+} \
+static const struct file_operations _##name##_file_ops = { \
+        .owner   = THIS_MODULE, \
+        .open    = _##name##_open, \
+        .read    = seq_read, \
+        .llseek  = seq_lseek, \
+        .release = seq_release \
+};
+
+#define DEBUGFS_FILE_CREATE(name) \
+do { \
+        struct dentry *ent; \
+        ent = debugfs_create_file(#name , 0400, ibd->qib_ibdev_dbg, \
+                ibd, &_##name##_file_ops); \
+        if (!ent) \
+                pr_warn("create of " #name " failed\n"); \
+} while (0)
+
+static void *_opcode_stats_seq_start(struct seq_file *s, loff_t *pos)
+{
+        struct qib_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 qib_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)
+{
+        /* nothing allocated */
+}
+
+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 qib_ibdev *ibd = (struct qib_ibdev *)s->private;
+        struct qib_devdata *dd = dd_from_dev(ibd);
+
+        for (j = 0; j < dd->first_user_ctxt; j++) {
+                if (!dd->rcd[j])
+                        continue;
+                n_packets += dd->rcd[j]->opstats->stats[i].n_packets;
+                n_bytes += dd->rcd[j]->opstats->stats[i].n_bytes;
+        }
+        if (!n_packets && !n_bytes)
+                return SEQ_SKIP;
+        seq_printf(s, "%02llx %llu/%llu\n", i,
+                (unsigned long long) n_packets,
+                (unsigned long long) n_bytes);
+
+        return 0;
+}
+
+DEBUGFS_FILE(opcode_stats)
+
+void qib_dbg_ibdev_init(struct qib_ibdev *ibd)
+{
+        char name[10];
+
+        snprintf(name, sizeof(name), "qib%d", dd_from_dev(ibd)->unit);
+        ibd->qib_ibdev_dbg = debugfs_create_dir(name, qib_dbg_root);
+        if (!ibd->qib_ibdev_dbg) {
+                pr_warn("create of %s failed\n", name);
+                return;
+        }
+        DEBUGFS_FILE_CREATE(opcode_stats);
+        return;
+}
+
+void qib_dbg_ibdev_exit(struct qib_ibdev *ibd)
+{
+        if (!qib_dbg_root)
+                goto out;
+        debugfs_remove_recursive(ibd->qib_ibdev_dbg);
+out:
+        ibd->qib_ibdev_dbg = NULL;
+}
+
+void qib_dbg_init(void)
+{
+        qib_dbg_root = debugfs_create_dir(QIB_DRV_NAME, NULL);
+        if (!qib_dbg_root)
+                pr_warn("init of debugfs failed\n");
+}
+
+void qib_dbg_exit(void)
+{
+        debugfs_remove_recursive(qib_dbg_root);
+        qib_dbg_root = NULL;
+}
+
+#endif
+