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>

drivers/net/ethernet/marvell/octeontx2/af/Makefile

@@ -8,4 +8,4 @@ obj-$(CONFIG_OCTEONTX2_AF) += octeontx2_af.o
 
 octeontx2_mbox-y := mbox.o
 octeontx2_af-y := cgx.o rvu.o rvu_cgx.o rvu_npa.o rvu_nix.o \
-		  rvu_reg.o rvu_npc.o
+		  rvu_reg.o rvu_npc.o rvu_debugfs.o

drivers/net/ethernet/marvell/octeontx2/af/rvu.c

@@ -2456,6 +2456,9 @@ static int rvu_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	if (err)
 		goto err_irq;
 
+	/* Initialize debugfs */
+	rvu_dbg_init(rvu);
+
 	return 0;
 err_irq:
 	rvu_unregister_interrupts(rvu);
@@ -2482,6 +2485,7 @@ static void rvu_remove(struct pci_dev *pdev)
 {
 	struct rvu *rvu = pci_get_drvdata(pdev);
 
+	rvu_dbg_exit(rvu);
 	rvu_unregister_interrupts(rvu);
 	rvu_flr_wq_destroy(rvu);
 	rvu_cgx_exit(rvu);

drivers/net/ethernet/marvell/octeontx2/af/rvu.h

@@ -35,6 +35,12 @@
 #define RVU_PFVF_FUNC_SHIFT	0
 #define RVU_PFVF_FUNC_MASK	0x3FF
 
+#ifdef CONFIG_DEBUG_FS
+struct rvu_debugfs {
+	struct dentry *root;
+};
+#endif
+
 struct rvu_work {
 	struct	work_struct work;
 	struct	rvu *rvu;
@@ -263,6 +269,10 @@ struct rvu {
 	struct list_head	cgx_evq_head; /* cgx event queue head */
 
 	char mkex_pfl_name[MKEX_NAME_LEN]; /* Configured MKEX profile name */
+
+#ifdef CONFIG_DEBUG_FS
+	struct rvu_debugfs	rvu_dbg;
+#endif
 };
 
 static inline void rvu_write64(struct rvu *rvu, u64 block, u64 offset, u64 val)
@@ -501,4 +511,12 @@ int rvu_mbox_handler_npc_mcam_alloc_and_write_entry(struct rvu *rvu,
 			  struct npc_mcam_alloc_and_write_entry_rsp *rsp);
 int rvu_mbox_handler_npc_get_kex_cfg(struct rvu *rvu, struct msg_req *req,
 				     struct npc_get_kex_cfg_rsp *rsp);
+
+#ifdef CONFIG_DEBUG_FS
+void rvu_dbg_init(struct rvu *rvu);
+void rvu_dbg_exit(struct rvu *rvu);
+#else
+static inline void rvu_dbg_init(struct rvu *rvu) {}
+static inline void rvu_dbg_exit(struct rvu *rvu) {}
+#endif
 #endif /* RVU_H */

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 */