505 lines
12 KiB
C
505 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2005-2014 Brocade Communications Systems, Inc.
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* Copyright (c) 2014- QLogic Corporation.
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* All rights reserved
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* www.qlogic.com
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*
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* Linux driver for QLogic BR-series Fibre Channel Host Bus Adapter.
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*/
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#include <linux/debugfs.h>
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#include <linux/export.h>
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#include "bfad_drv.h"
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#include "bfad_im.h"
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/*
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* BFA debufs interface
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*
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* To access the interface, debugfs file system should be mounted
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* if not already mounted using:
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* mount -t debugfs none /sys/kernel/debug
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*
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* BFA Hierarchy:
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* - bfa/pci_dev:<pci_name>
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* where the pci_name corresponds to the one under /sys/bus/pci/drivers/bfa
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*
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* Debugging service available per pci_dev:
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* fwtrc: To collect current firmware trace.
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* drvtrc: To collect current driver trace
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* fwsave: To collect last saved fw trace as a result of firmware crash.
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* regwr: To write one word to chip register
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* regrd: To read one or more words from chip register.
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*/
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struct bfad_debug_info {
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char *debug_buffer;
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void *i_private;
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int buffer_len;
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};
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static int
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bfad_debugfs_open_drvtrc(struct inode *inode, struct file *file)
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{
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struct bfad_port_s *port = inode->i_private;
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struct bfad_s *bfad = port->bfad;
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struct bfad_debug_info *debug;
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debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
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if (!debug)
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return -ENOMEM;
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debug->debug_buffer = (void *) bfad->trcmod;
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debug->buffer_len = sizeof(struct bfa_trc_mod_s);
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file->private_data = debug;
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return 0;
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}
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static int
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bfad_debugfs_open_fwtrc(struct inode *inode, struct file *file)
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{
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struct bfad_port_s *port = inode->i_private;
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struct bfad_s *bfad = port->bfad;
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struct bfad_debug_info *fw_debug;
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unsigned long flags;
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int rc;
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fw_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
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if (!fw_debug)
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return -ENOMEM;
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fw_debug->buffer_len = sizeof(struct bfa_trc_mod_s);
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fw_debug->debug_buffer = vzalloc(fw_debug->buffer_len);
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if (!fw_debug->debug_buffer) {
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kfree(fw_debug);
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printk(KERN_INFO "bfad[%d]: Failed to allocate fwtrc buffer\n",
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bfad->inst_no);
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return -ENOMEM;
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}
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spin_lock_irqsave(&bfad->bfad_lock, flags);
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rc = bfa_ioc_debug_fwtrc(&bfad->bfa.ioc,
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fw_debug->debug_buffer,
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&fw_debug->buffer_len);
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spin_unlock_irqrestore(&bfad->bfad_lock, flags);
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if (rc != BFA_STATUS_OK) {
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vfree(fw_debug->debug_buffer);
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fw_debug->debug_buffer = NULL;
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kfree(fw_debug);
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printk(KERN_INFO "bfad[%d]: Failed to collect fwtrc\n",
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bfad->inst_no);
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return -ENOMEM;
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}
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file->private_data = fw_debug;
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return 0;
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}
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static int
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bfad_debugfs_open_fwsave(struct inode *inode, struct file *file)
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{
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struct bfad_port_s *port = inode->i_private;
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struct bfad_s *bfad = port->bfad;
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struct bfad_debug_info *fw_debug;
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unsigned long flags;
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int rc;
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fw_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
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if (!fw_debug)
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return -ENOMEM;
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fw_debug->buffer_len = sizeof(struct bfa_trc_mod_s);
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fw_debug->debug_buffer = vzalloc(fw_debug->buffer_len);
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if (!fw_debug->debug_buffer) {
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kfree(fw_debug);
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printk(KERN_INFO "bfad[%d]: Failed to allocate fwsave buffer\n",
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bfad->inst_no);
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return -ENOMEM;
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}
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spin_lock_irqsave(&bfad->bfad_lock, flags);
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rc = bfa_ioc_debug_fwsave(&bfad->bfa.ioc,
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fw_debug->debug_buffer,
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&fw_debug->buffer_len);
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spin_unlock_irqrestore(&bfad->bfad_lock, flags);
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if (rc != BFA_STATUS_OK) {
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vfree(fw_debug->debug_buffer);
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fw_debug->debug_buffer = NULL;
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kfree(fw_debug);
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printk(KERN_INFO "bfad[%d]: Failed to collect fwsave\n",
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bfad->inst_no);
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return -ENOMEM;
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}
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file->private_data = fw_debug;
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return 0;
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}
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static int
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bfad_debugfs_open_reg(struct inode *inode, struct file *file)
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{
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struct bfad_debug_info *reg_debug;
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reg_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
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if (!reg_debug)
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return -ENOMEM;
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reg_debug->i_private = inode->i_private;
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file->private_data = reg_debug;
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return 0;
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}
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/* Changes the current file position */
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static loff_t
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bfad_debugfs_lseek(struct file *file, loff_t offset, int orig)
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{
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struct bfad_debug_info *debug = file->private_data;
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return fixed_size_llseek(file, offset, orig,
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debug->buffer_len);
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}
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static ssize_t
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bfad_debugfs_read(struct file *file, char __user *buf,
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size_t nbytes, loff_t *pos)
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{
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struct bfad_debug_info *debug = file->private_data;
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if (!debug || !debug->debug_buffer)
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return 0;
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return simple_read_from_buffer(buf, nbytes, pos,
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debug->debug_buffer, debug->buffer_len);
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}
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#define BFA_REG_CT_ADDRSZ (0x40000)
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#define BFA_REG_CB_ADDRSZ (0x20000)
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#define BFA_REG_ADDRSZ(__ioc) \
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((u32)(bfa_asic_id_ctc(bfa_ioc_devid(__ioc)) ? \
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BFA_REG_CT_ADDRSZ : BFA_REG_CB_ADDRSZ))
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#define BFA_REG_ADDRMSK(__ioc) (BFA_REG_ADDRSZ(__ioc) - 1)
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static bfa_status_t
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bfad_reg_offset_check(struct bfa_s *bfa, u32 offset, u32 len)
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{
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u8 area;
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/* check [16:15] */
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area = (offset >> 15) & 0x7;
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if (area == 0) {
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/* PCIe core register */
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if ((offset + (len<<2)) > 0x8000) /* 8k dwords or 32KB */
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return BFA_STATUS_EINVAL;
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} else if (area == 0x1) {
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/* CB 32 KB memory page */
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if ((offset + (len<<2)) > 0x10000) /* 8k dwords or 32KB */
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return BFA_STATUS_EINVAL;
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} else {
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/* CB register space 64KB */
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if ((offset + (len<<2)) > BFA_REG_ADDRMSK(&bfa->ioc))
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return BFA_STATUS_EINVAL;
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}
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return BFA_STATUS_OK;
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}
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static ssize_t
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bfad_debugfs_read_regrd(struct file *file, char __user *buf,
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size_t nbytes, loff_t *pos)
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{
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struct bfad_debug_info *regrd_debug = file->private_data;
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struct bfad_port_s *port = (struct bfad_port_s *)regrd_debug->i_private;
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struct bfad_s *bfad = port->bfad;
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ssize_t rc;
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if (!bfad->regdata)
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return 0;
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rc = simple_read_from_buffer(buf, nbytes, pos,
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bfad->regdata, bfad->reglen);
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if ((*pos + nbytes) >= bfad->reglen) {
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kfree(bfad->regdata);
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bfad->regdata = NULL;
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bfad->reglen = 0;
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}
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return rc;
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}
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static ssize_t
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bfad_debugfs_write_regrd(struct file *file, const char __user *buf,
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size_t nbytes, loff_t *ppos)
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{
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struct bfad_debug_info *regrd_debug = file->private_data;
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struct bfad_port_s *port = (struct bfad_port_s *)regrd_debug->i_private;
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struct bfad_s *bfad = port->bfad;
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struct bfa_s *bfa = &bfad->bfa;
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struct bfa_ioc_s *ioc = &bfa->ioc;
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int addr, rc, i;
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u32 len;
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u32 *regbuf;
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void __iomem *rb, *reg_addr;
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unsigned long flags;
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void *kern_buf;
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kern_buf = memdup_user(buf, nbytes);
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if (IS_ERR(kern_buf))
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return PTR_ERR(kern_buf);
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rc = sscanf(kern_buf, "%x:%x", &addr, &len);
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if (rc < 2 || len > (UINT_MAX >> 2)) {
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printk(KERN_INFO
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"bfad[%d]: %s failed to read user buf\n",
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bfad->inst_no, __func__);
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kfree(kern_buf);
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return -EINVAL;
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}
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kfree(kern_buf);
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kfree(bfad->regdata);
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bfad->regdata = NULL;
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bfad->reglen = 0;
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bfad->regdata = kzalloc(len << 2, GFP_KERNEL);
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if (!bfad->regdata) {
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printk(KERN_INFO "bfad[%d]: Failed to allocate regrd buffer\n",
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bfad->inst_no);
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return -ENOMEM;
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}
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bfad->reglen = len << 2;
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rb = bfa_ioc_bar0(ioc);
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addr &= BFA_REG_ADDRMSK(ioc);
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/* offset and len sanity check */
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rc = bfad_reg_offset_check(bfa, addr, len);
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if (rc) {
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printk(KERN_INFO "bfad[%d]: Failed reg offset check\n",
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bfad->inst_no);
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kfree(bfad->regdata);
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bfad->regdata = NULL;
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bfad->reglen = 0;
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return -EINVAL;
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}
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reg_addr = rb + addr;
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regbuf = (u32 *)bfad->regdata;
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spin_lock_irqsave(&bfad->bfad_lock, flags);
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for (i = 0; i < len; i++) {
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*regbuf = readl(reg_addr);
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regbuf++;
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reg_addr += sizeof(u32);
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}
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spin_unlock_irqrestore(&bfad->bfad_lock, flags);
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return nbytes;
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}
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static ssize_t
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bfad_debugfs_write_regwr(struct file *file, const char __user *buf,
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size_t nbytes, loff_t *ppos)
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{
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struct bfad_debug_info *debug = file->private_data;
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struct bfad_port_s *port = (struct bfad_port_s *)debug->i_private;
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struct bfad_s *bfad = port->bfad;
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struct bfa_s *bfa = &bfad->bfa;
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struct bfa_ioc_s *ioc = &bfa->ioc;
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int addr, val, rc;
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void __iomem *reg_addr;
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unsigned long flags;
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void *kern_buf;
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kern_buf = memdup_user(buf, nbytes);
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if (IS_ERR(kern_buf))
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return PTR_ERR(kern_buf);
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rc = sscanf(kern_buf, "%x:%x", &addr, &val);
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if (rc < 2) {
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printk(KERN_INFO
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"bfad[%d]: %s failed to read user buf\n",
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bfad->inst_no, __func__);
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kfree(kern_buf);
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return -EINVAL;
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}
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kfree(kern_buf);
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addr &= BFA_REG_ADDRMSK(ioc); /* offset only 17 bit and word align */
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/* offset and len sanity check */
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rc = bfad_reg_offset_check(bfa, addr, 1);
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if (rc) {
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printk(KERN_INFO
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"bfad[%d]: Failed reg offset check\n",
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bfad->inst_no);
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return -EINVAL;
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}
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reg_addr = (bfa_ioc_bar0(ioc)) + addr;
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spin_lock_irqsave(&bfad->bfad_lock, flags);
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writel(val, reg_addr);
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spin_unlock_irqrestore(&bfad->bfad_lock, flags);
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return nbytes;
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}
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static int
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bfad_debugfs_release(struct inode *inode, struct file *file)
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{
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struct bfad_debug_info *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 int
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bfad_debugfs_release_fwtrc(struct inode *inode, struct file *file)
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{
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struct bfad_debug_info *fw_debug = file->private_data;
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if (!fw_debug)
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return 0;
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if (fw_debug->debug_buffer)
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vfree(fw_debug->debug_buffer);
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file->private_data = NULL;
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kfree(fw_debug);
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return 0;
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}
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static const struct file_operations bfad_debugfs_op_drvtrc = {
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.owner = THIS_MODULE,
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.open = bfad_debugfs_open_drvtrc,
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.llseek = bfad_debugfs_lseek,
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.read = bfad_debugfs_read,
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.release = bfad_debugfs_release,
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};
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static const struct file_operations bfad_debugfs_op_fwtrc = {
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.owner = THIS_MODULE,
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.open = bfad_debugfs_open_fwtrc,
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.llseek = bfad_debugfs_lseek,
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.read = bfad_debugfs_read,
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.release = bfad_debugfs_release_fwtrc,
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};
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static const struct file_operations bfad_debugfs_op_fwsave = {
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.owner = THIS_MODULE,
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.open = bfad_debugfs_open_fwsave,
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.llseek = bfad_debugfs_lseek,
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.read = bfad_debugfs_read,
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.release = bfad_debugfs_release_fwtrc,
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};
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static const struct file_operations bfad_debugfs_op_regrd = {
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.owner = THIS_MODULE,
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.open = bfad_debugfs_open_reg,
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.llseek = bfad_debugfs_lseek,
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.read = bfad_debugfs_read_regrd,
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.write = bfad_debugfs_write_regrd,
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.release = bfad_debugfs_release,
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};
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static const struct file_operations bfad_debugfs_op_regwr = {
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.owner = THIS_MODULE,
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.open = bfad_debugfs_open_reg,
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.llseek = bfad_debugfs_lseek,
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.write = bfad_debugfs_write_regwr,
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.release = bfad_debugfs_release,
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};
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struct bfad_debugfs_entry {
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const char *name;
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umode_t mode;
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const struct file_operations *fops;
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};
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static const struct bfad_debugfs_entry bfad_debugfs_files[] = {
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{ "drvtrc", S_IFREG|S_IRUGO, &bfad_debugfs_op_drvtrc, },
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{ "fwtrc", S_IFREG|S_IRUGO, &bfad_debugfs_op_fwtrc, },
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{ "fwsave", S_IFREG|S_IRUGO, &bfad_debugfs_op_fwsave, },
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{ "regrd", S_IFREG|S_IRUGO|S_IWUSR, &bfad_debugfs_op_regrd, },
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{ "regwr", S_IFREG|S_IWUSR, &bfad_debugfs_op_regwr, },
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};
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static struct dentry *bfa_debugfs_root;
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static atomic_t bfa_debugfs_port_count;
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inline void
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bfad_debugfs_init(struct bfad_port_s *port)
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{
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struct bfad_s *bfad = port->bfad;
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const struct bfad_debugfs_entry *file;
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char name[64];
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int i;
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if (!bfa_debugfs_enable)
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return;
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/* Setup the BFA debugfs root directory*/
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if (!bfa_debugfs_root) {
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bfa_debugfs_root = debugfs_create_dir("bfa", NULL);
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atomic_set(&bfa_debugfs_port_count, 0);
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}
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/* Setup the pci_dev debugfs directory for the port */
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snprintf(name, sizeof(name), "pci_dev:%s", bfad->pci_name);
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if (!port->port_debugfs_root) {
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port->port_debugfs_root =
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debugfs_create_dir(name, bfa_debugfs_root);
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atomic_inc(&bfa_debugfs_port_count);
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for (i = 0; i < ARRAY_SIZE(bfad_debugfs_files); i++) {
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file = &bfad_debugfs_files[i];
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bfad->bfad_dentry_files[i] =
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debugfs_create_file(file->name,
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file->mode,
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port->port_debugfs_root,
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port,
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file->fops);
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}
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}
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return;
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}
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inline void
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bfad_debugfs_exit(struct bfad_port_s *port)
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{
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struct bfad_s *bfad = port->bfad;
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int i;
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for (i = 0; i < ARRAY_SIZE(bfad_debugfs_files); i++) {
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if (bfad->bfad_dentry_files[i]) {
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debugfs_remove(bfad->bfad_dentry_files[i]);
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bfad->bfad_dentry_files[i] = NULL;
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}
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}
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/* Remove the pci_dev debugfs directory for the port */
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if (port->port_debugfs_root) {
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debugfs_remove(port->port_debugfs_root);
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port->port_debugfs_root = NULL;
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atomic_dec(&bfa_debugfs_port_count);
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|
}
|
|
|
|
/* Remove the BFA debugfs root directory */
|
|
if (atomic_read(&bfa_debugfs_port_count) == 0) {
|
|
debugfs_remove(bfa_debugfs_root);
|
|
bfa_debugfs_root = NULL;
|
|
}
|
|
}
|