mirror of https://gitee.com/openkylin/linux.git
158 lines
3.7 KiB
C
158 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Debugfs interface Support for MPT (Message Passing Technology) based
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* controllers.
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*
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* Copyright (C) 2020 Broadcom Inc.
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*
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* Authors: Broadcom Inc.
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* Sreekanth Reddy <sreekanth.reddy@broadcom.com>
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* Suganath Prabu <suganath-prabu.subramani@broadcom.com>
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*
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* Send feedback to : MPT-FusionLinux.pdl@broadcom.com)
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*
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**/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/interrupt.h>
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#include <linux/compat.h>
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#include <linux/uio.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_host.h>
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#include "mpt3sas_base.h"
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#include <linux/debugfs.h>
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static struct dentry *mpt3sas_debugfs_root;
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/*
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* _debugfs_iocdump_read - copy ioc dump from debugfs buffer
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* @filep: File Pointer
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* @ubuf: Buffer to fill data
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* @cnt: Length of the buffer
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* @ppos: Offset in the file
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*/
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static ssize_t
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_debugfs_iocdump_read(struct file *filp, char __user *ubuf, size_t cnt,
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loff_t *ppos)
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{
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struct mpt3sas_debugfs_buffer *debug = filp->private_data;
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if (!debug || !debug->buf)
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return 0;
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return simple_read_from_buffer(ubuf, cnt, ppos, debug->buf, debug->len);
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}
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/*
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* _debugfs_iocdump_open : open the ioc_dump debugfs attribute file
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*/
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static int
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_debugfs_iocdump_open(struct inode *inode, struct file *file)
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{
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struct MPT3SAS_ADAPTER *ioc = inode->i_private;
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struct mpt3sas_debugfs_buffer *debug;
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debug = kzalloc(sizeof(struct mpt3sas_debugfs_buffer), GFP_KERNEL);
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if (!debug)
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return -ENOMEM;
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debug->buf = (void *)ioc;
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debug->len = sizeof(struct MPT3SAS_ADAPTER);
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file->private_data = debug;
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return 0;
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}
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/*
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* _debugfs_iocdump_release : release the ioc_dump debugfs attribute
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* @inode: inode structure to the corresponds device
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* @file: File pointer
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*/
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static int
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_debugfs_iocdump_release(struct inode *inode, struct file *file)
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{
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struct mpt3sas_debugfs_buffer *debug = file->private_data;
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if (!debug)
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return 0;
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file->private_data = NULL;
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kfree(debug);
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return 0;
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}
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static const struct file_operations mpt3sas_debugfs_iocdump_fops = {
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.owner = THIS_MODULE,
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.open = _debugfs_iocdump_open,
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.read = _debugfs_iocdump_read,
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.release = _debugfs_iocdump_release,
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};
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/*
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* mpt3sas_init_debugfs : Create debugfs root for mpt3sas driver
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*/
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void mpt3sas_init_debugfs(void)
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{
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mpt3sas_debugfs_root = debugfs_create_dir("mpt3sas", NULL);
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if (!mpt3sas_debugfs_root)
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pr_info("mpt3sas: Cannot create debugfs root\n");
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}
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/*
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* mpt3sas_exit_debugfs : Remove debugfs root for mpt3sas driver
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*/
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void mpt3sas_exit_debugfs(void)
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{
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debugfs_remove_recursive(mpt3sas_debugfs_root);
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}
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/*
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* mpt3sas_setup_debugfs : Setup debugfs per HBA adapter
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* ioc: MPT3SAS_ADAPTER object
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*/
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void
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mpt3sas_setup_debugfs(struct MPT3SAS_ADAPTER *ioc)
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{
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char name[64];
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snprintf(name, sizeof(name), "scsi_host%d", ioc->shost->host_no);
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if (!ioc->debugfs_root) {
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ioc->debugfs_root =
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debugfs_create_dir(name, mpt3sas_debugfs_root);
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if (!ioc->debugfs_root) {
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dev_err(&ioc->pdev->dev,
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"Cannot create per adapter debugfs directory\n");
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return;
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}
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}
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snprintf(name, sizeof(name), "ioc_dump");
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ioc->ioc_dump = debugfs_create_file(name, 0444,
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ioc->debugfs_root, ioc, &mpt3sas_debugfs_iocdump_fops);
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if (!ioc->ioc_dump) {
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dev_err(&ioc->pdev->dev,
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"Cannot create ioc_dump debugfs file\n");
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debugfs_remove(ioc->debugfs_root);
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return;
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}
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snprintf(name, sizeof(name), "host_recovery");
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debugfs_create_u8(name, 0444, ioc->debugfs_root, &ioc->shost_recovery);
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}
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/*
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* mpt3sas_destroy_debugfs : Destroy debugfs per HBA adapter
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* @ioc: MPT3SAS_ADAPTER object
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*/
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void mpt3sas_destroy_debugfs(struct MPT3SAS_ADAPTER *ioc)
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{
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debugfs_remove_recursive(ioc->debugfs_root);
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}
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