rvu_debugfs.c

// 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 */