octeontx2-af: Dump current resource provisioning status

Added support to dump current resource provisioning status
of all resource virtualization unit (RVU) block's
(i.e NPA, NIX, SSO, SSOW, CPT, TIM) local functions attached
to a PF_FUNC into a debugfs file.

'cat /sys/kernel/debug/octeontx2/rsrc_alloc'
will show the current block LF's allocation status.

Signed-off-by: Christina Jacob <cjacob@marvell.com>
Signed-off-by: Prakash Brahmajyosyula <bprakash@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 146 insertions, 0 deletions

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c
new file mode 100644
index 000000000000..ede6cdb7cf23
--- /dev/null
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Marvell OcteonTx2 RVU Admin Function driver
+ *
+ * Copyright (C) 2019 Marvell International Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifdef CONFIG_DEBUG_FS
+
+#include <linux/fs.h>
+#include <linux/debugfs.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#include "rvu_struct.h"
+#include "rvu_reg.h"
+#include "rvu.h"
+
+#define DEBUGFS_DIR_NAME "octeontx2"
+
+#define rvu_dbg_NULL NULL
+
+#define RVU_DEBUG_FOPS(name, read_op, write_op) \
+static const struct file_operations rvu_dbg_##name##_fops = { \
+	.owner = THIS_MODULE, \
+	.open = simple_open, \
+	.read = rvu_dbg_##read_op, \
+	.write = rvu_dbg_##write_op \
+}
+
+/* Dumps current provisioning status of all RVU block LFs */
+static ssize_t rvu_dbg_rsrc_attach_status(struct file *filp,
+					  char __user *buffer,
+					  size_t count, loff_t *ppos)
+{
+	int index, off = 0, flag = 0, go_back = 0, off_prev;
+	struct rvu *rvu = filp->private_data;
+	int lf, pf, vf, pcifunc;
+	struct rvu_block block;
+	int bytes_not_copied;
+	int buf_size = 2048;
+	char *buf;
+
+	/* don't allow partial reads */
+	if (*ppos != 0)
+		return 0;
+
+	buf = kzalloc(buf_size, GFP_KERNEL);
+	if (!buf)
+		return -ENOSPC;
+	off +=	scnprintf(&buf[off], buf_size - 1 - off, "\npcifunc\t\t");
+	for (index = 0; index < BLK_COUNT; index++)
+		if (strlen(rvu->hw->block[index].name))
+			off +=	scnprintf(&buf[off], buf_size - 1 - off,
+					  "%*s\t", (index - 1) * 2,
+					  rvu->hw->block[index].name);
+	off += scnprintf(&buf[off], buf_size - 1 - off, "\n");
+	for (pf = 0; pf < rvu->hw->total_pfs; pf++) {
+		for (vf = 0; vf <= rvu->hw->total_vfs; vf++) {
+			pcifunc = pf << 10 | vf;
+			if (!pcifunc)
+				continue;
+
+			if (vf) {
+				go_back = scnprintf(&buf[off],
+						    buf_size - 1 - off,
+						    "PF%d:VF%d\t\t", pf,
+						    vf - 1);
+			} else {
+				go_back = scnprintf(&buf[off],
+						    buf_size - 1 - off,
+						    "PF%d\t\t", pf);
+			}
+
+			off += go_back;
+			for (index = 0; index < BLKTYPE_MAX; index++) {
+				block = rvu->hw->block[index];
+				if (!strlen(block.name))
+					continue;
+				off_prev = off;
+				for (lf = 0; lf < block.lf.max; lf++) {
+					if (block.fn_map[lf] != pcifunc)
+						continue;
+					flag = 1;
+					off += scnprintf(&buf[off], buf_size - 1
+							- off, "%3d,", lf);
+				}
+				if (flag && off_prev != off)
+					off--;
+				else
+					go_back++;
+				off += scnprintf(&buf[off], buf_size - 1 - off,
+						"\t");
+			}
+			if (!flag)
+				off -= go_back;
+			else
+				flag = 0;
+			off--;
+			off +=	scnprintf(&buf[off], buf_size - 1 - off, "\n");
+		}
+	}
+
+	bytes_not_copied = copy_to_user(buffer, buf, off);
+	kfree(buf);
+
+	if (bytes_not_copied)
+		return -EFAULT;
+
+	*ppos = off;
+	return off;
+}
+
+RVU_DEBUG_FOPS(rsrc_status, rsrc_attach_status, NULL);
+
+void rvu_dbg_init(struct rvu *rvu)
+{
+	struct device *dev = &rvu->pdev->dev;
+	struct dentry *pfile;
+
+	rvu->rvu_dbg.root = debugfs_create_dir(DEBUGFS_DIR_NAME, NULL);
+	if (!rvu->rvu_dbg.root) {
+		dev_err(rvu->dev, "%s failed\n", __func__);
+		return;
+	}
+	pfile = debugfs_create_file("rsrc_alloc", 0444, rvu->rvu_dbg.root, rvu,
+				    &rvu_dbg_rsrc_status_fops);
+	if (!pfile)
+		goto create_failed;
+
+	return;
+
+create_failed:
+	dev_err(dev, "Failed to create debugfs dir\n");
+	debugfs_remove_recursive(rvu->rvu_dbg.root);
+}
+
+void rvu_dbg_exit(struct rvu *rvu)
+{
+	debugfs_remove_recursive(rvu->rvu_dbg.root);
+}
+
+#endif /* CONFIG_DEBUG_FS */