diff options
Diffstat (limited to 'drivers/scsi/mpt3sas/mpt3sas_debugfs.c')
| -rw-r--r-- | drivers/scsi/mpt3sas/mpt3sas_debugfs.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/drivers/scsi/mpt3sas/mpt3sas_debugfs.c b/drivers/scsi/mpt3sas/mpt3sas_debugfs.c new file mode 100644 index 000000000000..a6ab1db81167 --- /dev/null +++ b/drivers/scsi/mpt3sas/mpt3sas_debugfs.c @@ -0,0 +1,157 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Debugfs interface Support for MPT (Message Passing Technology) based + * controllers. + * + * Copyright (C) 2020 Broadcom Inc. + * + * Authors: Broadcom Inc. + * Sreekanth Reddy <sreekanth.reddy@broadcom.com> + * Suganath Prabu <suganath-prabu.subramani@broadcom.com> + * + * Send feedback to : MPT-FusionLinux.pdl@broadcom.com) + * + **/ + +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/pci.h> +#include <linux/interrupt.h> +#include <linux/compat.h> +#include <linux/uio.h> + +#include <scsi/scsi.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_host.h> +#include "mpt3sas_base.h" +#include <linux/debugfs.h> + +static struct dentry *mpt3sas_debugfs_root; + +/* + * _debugfs_iocdump_read - copy ioc dump from debugfs buffer + * @filep: File Pointer + * @ubuf: Buffer to fill data + * @cnt: Length of the buffer + * @ppos: Offset in the file + */ + +static ssize_t +_debugfs_iocdump_read(struct file *filp, char __user *ubuf, size_t cnt, + loff_t *ppos) + +{ + struct mpt3sas_debugfs_buffer *debug = filp->private_data; + + if (!debug || !debug->buf) + return 0; + + return simple_read_from_buffer(ubuf, cnt, ppos, debug->buf, debug->len); +} + +/* + * _debugfs_iocdump_open : open the ioc_dump debugfs attribute file + */ +static int +_debugfs_iocdump_open(struct inode *inode, struct file *file) +{ + struct MPT3SAS_ADAPTER *ioc = inode->i_private; + struct mpt3sas_debugfs_buffer *debug; + + debug = kzalloc(sizeof(struct mpt3sas_debugfs_buffer), GFP_KERNEL); + if (!debug) + return -ENOMEM; + + debug->buf = (void *)ioc; + debug->len = sizeof(struct MPT3SAS_ADAPTER); + file->private_data = debug; + return 0; +} + +/* + * _debugfs_iocdump_release : release the ioc_dump debugfs attribute + * @inode: inode structure to the corresponds device + * @file: File pointer + */ +static int +_debugfs_iocdump_release(struct inode *inode, struct file *file) +{ + struct mpt3sas_debugfs_buffer *debug = file->private_data; + + if (!debug) + return 0; + + file->private_data = NULL; + kfree(debug); + return 0; +} + +static const struct file_operations mpt3sas_debugfs_iocdump_fops = { + .owner = THIS_MODULE, + .open = _debugfs_iocdump_open, + .read = _debugfs_iocdump_read, + .release = _debugfs_iocdump_release, +}; + +/* + * mpt3sas_init_debugfs : Create debugfs root for mpt3sas driver + */ +void mpt3sas_init_debugfs(void) +{ + mpt3sas_debugfs_root = debugfs_create_dir("mpt3sas", NULL); + if (!mpt3sas_debugfs_root) + pr_info("mpt3sas: Cannot create debugfs root\n"); +} + +/* + * mpt3sas_exit_debugfs : Remove debugfs root for mpt3sas driver + */ +void mpt3sas_exit_debugfs(void) +{ + debugfs_remove_recursive(mpt3sas_debugfs_root); +} + +/* + * mpt3sas_setup_debugfs : Setup debugfs per HBA adapter + * ioc: MPT3SAS_ADAPTER object + */ +void +mpt3sas_setup_debugfs(struct MPT3SAS_ADAPTER *ioc) +{ + char name[64]; + + snprintf(name, sizeof(name), "scsi_host%d", ioc->shost->host_no); + if (!ioc->debugfs_root) { + ioc->debugfs_root = + debugfs_create_dir(name, mpt3sas_debugfs_root); + if (!ioc->debugfs_root) { + dev_err(&ioc->pdev->dev, + "Cannot create per adapter debugfs directory\n"); + return; + } + } + + snprintf(name, sizeof(name), "ioc_dump"); + ioc->ioc_dump = debugfs_create_file(name, 0444, + ioc->debugfs_root, ioc, &mpt3sas_debugfs_iocdump_fops); + if (!ioc->ioc_dump) { + dev_err(&ioc->pdev->dev, + "Cannot create ioc_dump debugfs file\n"); + debugfs_remove(ioc->debugfs_root); + return; + } + + snprintf(name, sizeof(name), "host_recovery"); + debugfs_create_u8(name, 0444, ioc->debugfs_root, &ioc->shost_recovery); + +} + +/* + * mpt3sas_destroy_debugfs : Destroy debugfs per HBA adapter + * @ioc: MPT3SAS_ADAPTER object + */ +void mpt3sas_destroy_debugfs(struct MPT3SAS_ADAPTER *ioc) +{ + debugfs_remove_recursive(ioc->debugfs_root); +} + |