/kernel-source/drivers/scsi/bfa/bfad_debugfs.c
C | 550 lines | 417 code | 88 blank | 45 comment | 48 complexity | 125d6035e073bdca88dac409ea8c2e96 MD5 | raw file
- /*
- * Copyright (c) 2005-2010 Brocade Communications Systems, Inc.
- * All rights reserved
- * www.brocade.com
- *
- * Linux driver for Brocade Fibre Channel Host Bus Adapter.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License (GPL) Version 2 as
- * published by the Free Software Foundation
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- */
- #include <linux/debugfs.h>
- #include <linux/export.h>
- #include "bfad_drv.h"
- #include "bfad_im.h"
- /*
- * BFA debufs interface
- *
- * To access the interface, debugfs file system should be mounted
- * if not already mounted using:
- * mount -t debugfs none /sys/kernel/debug
- *
- * BFA Hierarchy:
- * - bfa/pci_dev:<pci_name>
- * where the pci_name corresponds to the one under /sys/bus/pci/drivers/bfa
- *
- * Debugging service available per pci_dev:
- * fwtrc: To collect current firmware trace.
- * drvtrc: To collect current driver trace
- * fwsave: To collect last saved fw trace as a result of firmware crash.
- * regwr: To write one word to chip register
- * regrd: To read one or more words from chip register.
- */
- struct bfad_debug_info {
- char *debug_buffer;
- void *i_private;
- int buffer_len;
- };
- static int
- bfad_debugfs_open_drvtrc(struct inode *inode, struct file *file)
- {
- struct bfad_port_s *port = inode->i_private;
- struct bfad_s *bfad = port->bfad;
- struct bfad_debug_info *debug;
- debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
- if (!debug)
- return -ENOMEM;
- debug->debug_buffer = (void *) bfad->trcmod;
- debug->buffer_len = sizeof(struct bfa_trc_mod_s);
- file->private_data = debug;
- return 0;
- }
- static int
- bfad_debugfs_open_fwtrc(struct inode *inode, struct file *file)
- {
- struct bfad_port_s *port = inode->i_private;
- struct bfad_s *bfad = port->bfad;
- struct bfad_debug_info *fw_debug;
- unsigned long flags;
- int rc;
- fw_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
- if (!fw_debug)
- return -ENOMEM;
- fw_debug->buffer_len = sizeof(struct bfa_trc_mod_s);
- fw_debug->debug_buffer = vmalloc(fw_debug->buffer_len);
- if (!fw_debug->debug_buffer) {
- kfree(fw_debug);
- printk(KERN_INFO "bfad[%d]: Failed to allocate fwtrc buffer\n",
- bfad->inst_no);
- return -ENOMEM;
- }
- memset(fw_debug->debug_buffer, 0, fw_debug->buffer_len);
- spin_lock_irqsave(&bfad->bfad_lock, flags);
- rc = bfa_ioc_debug_fwtrc(&bfad->bfa.ioc,
- fw_debug->debug_buffer,
- &fw_debug->buffer_len);
- spin_unlock_irqrestore(&bfad->bfad_lock, flags);
- if (rc != BFA_STATUS_OK) {
- vfree(fw_debug->debug_buffer);
- fw_debug->debug_buffer = NULL;
- kfree(fw_debug);
- printk(KERN_INFO "bfad[%d]: Failed to collect fwtrc\n",
- bfad->inst_no);
- return -ENOMEM;
- }
- file->private_data = fw_debug;
- return 0;
- }
- static int
- bfad_debugfs_open_fwsave(struct inode *inode, struct file *file)
- {
- struct bfad_port_s *port = inode->i_private;
- struct bfad_s *bfad = port->bfad;
- struct bfad_debug_info *fw_debug;
- unsigned long flags;
- int rc;
- fw_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
- if (!fw_debug)
- return -ENOMEM;
- fw_debug->buffer_len = sizeof(struct bfa_trc_mod_s);
- fw_debug->debug_buffer = vmalloc(fw_debug->buffer_len);
- if (!fw_debug->debug_buffer) {
- kfree(fw_debug);
- printk(KERN_INFO "bfad[%d]: Failed to allocate fwsave buffer\n",
- bfad->inst_no);
- return -ENOMEM;
- }
- memset(fw_debug->debug_buffer, 0, fw_debug->buffer_len);
- spin_lock_irqsave(&bfad->bfad_lock, flags);
- rc = bfa_ioc_debug_fwsave(&bfad->bfa.ioc,
- fw_debug->debug_buffer,
- &fw_debug->buffer_len);
- spin_unlock_irqrestore(&bfad->bfad_lock, flags);
- if (rc != BFA_STATUS_OK) {
- vfree(fw_debug->debug_buffer);
- fw_debug->debug_buffer = NULL;
- kfree(fw_debug);
- printk(KERN_INFO "bfad[%d]: Failed to collect fwsave\n",
- bfad->inst_no);
- return -ENOMEM;
- }
- file->private_data = fw_debug;
- return 0;
- }
- static int
- bfad_debugfs_open_reg(struct inode *inode, struct file *file)
- {
- struct bfad_debug_info *reg_debug;
- reg_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
- if (!reg_debug)
- return -ENOMEM;
- reg_debug->i_private = inode->i_private;
- file->private_data = reg_debug;
- return 0;
- }
- /* Changes the current file position */
- static loff_t
- bfad_debugfs_lseek(struct file *file, loff_t offset, int orig)
- {
- struct bfad_debug_info *debug = file->private_data;
- return fixed_size_llseek(file, offset, orig,
- debug->buffer_len);
- }
- static ssize_t
- bfad_debugfs_read(struct file *file, char __user *buf,
- size_t nbytes, loff_t *pos)
- {
- struct bfad_debug_info *debug = file->private_data;
- if (!debug || !debug->debug_buffer)
- return 0;
- return simple_read_from_buffer(buf, nbytes, pos,
- debug->debug_buffer, debug->buffer_len);
- }
- #define BFA_REG_CT_ADDRSZ (0x40000)
- #define BFA_REG_CB_ADDRSZ (0x20000)
- #define BFA_REG_ADDRSZ(__ioc) \
- ((u32)(bfa_asic_id_ctc(bfa_ioc_devid(__ioc)) ? \
- BFA_REG_CT_ADDRSZ : BFA_REG_CB_ADDRSZ))
- #define BFA_REG_ADDRMSK(__ioc) (BFA_REG_ADDRSZ(__ioc) - 1)
- static bfa_status_t
- bfad_reg_offset_check(struct bfa_s *bfa, u32 offset, u32 len)
- {
- u8 area;
- /* check [16:15] */
- area = (offset >> 15) & 0x7;
- if (area == 0) {
- /* PCIe core register */
- if ((offset + (len<<2)) > 0x8000) /* 8k dwords or 32KB */
- return BFA_STATUS_EINVAL;
- } else if (area == 0x1) {
- /* CB 32 KB memory page */
- if ((offset + (len<<2)) > 0x10000) /* 8k dwords or 32KB */
- return BFA_STATUS_EINVAL;
- } else {
- /* CB register space 64KB */
- if ((offset + (len<<2)) > BFA_REG_ADDRMSK(&bfa->ioc))
- return BFA_STATUS_EINVAL;
- }
- return BFA_STATUS_OK;
- }
- static ssize_t
- bfad_debugfs_read_regrd(struct file *file, char __user *buf,
- size_t nbytes, loff_t *pos)
- {
- struct bfad_debug_info *regrd_debug = file->private_data;
- struct bfad_port_s *port = (struct bfad_port_s *)regrd_debug->i_private;
- struct bfad_s *bfad = port->bfad;
- ssize_t rc;
- if (!bfad->regdata)
- return 0;
- rc = simple_read_from_buffer(buf, nbytes, pos,
- bfad->regdata, bfad->reglen);
- if ((*pos + nbytes) >= bfad->reglen) {
- kfree(bfad->regdata);
- bfad->regdata = NULL;
- bfad->reglen = 0;
- }
- return rc;
- }
- static ssize_t
- bfad_debugfs_write_regrd(struct file *file, const char __user *buf,
- size_t nbytes, loff_t *ppos)
- {
- struct bfad_debug_info *regrd_debug = file->private_data;
- struct bfad_port_s *port = (struct bfad_port_s *)regrd_debug->i_private;
- struct bfad_s *bfad = port->bfad;
- struct bfa_s *bfa = &bfad->bfa;
- struct bfa_ioc_s *ioc = &bfa->ioc;
- int addr, len, rc, i;
- u32 *regbuf;
- void __iomem *rb, *reg_addr;
- unsigned long flags;
- void *kern_buf;
- kern_buf = kzalloc(nbytes, GFP_KERNEL);
- if (!kern_buf) {
- printk(KERN_INFO "bfad[%d]: Failed to allocate buffer\n",
- bfad->inst_no);
- return -ENOMEM;
- }
- if (copy_from_user(kern_buf, (void __user *)buf, nbytes)) {
- kfree(kern_buf);
- return -ENOMEM;
- }
- rc = sscanf(kern_buf, "%x:%x", &addr, &len);
- if (rc < 2) {
- printk(KERN_INFO
- "bfad[%d]: %s failed to read user buf\n",
- bfad->inst_no, __func__);
- kfree(kern_buf);
- return -EINVAL;
- }
- kfree(kern_buf);
- kfree(bfad->regdata);
- bfad->regdata = NULL;
- bfad->reglen = 0;
- bfad->regdata = kzalloc(len << 2, GFP_KERNEL);
- if (!bfad->regdata) {
- printk(KERN_INFO "bfad[%d]: Failed to allocate regrd buffer\n",
- bfad->inst_no);
- return -ENOMEM;
- }
- bfad->reglen = len << 2;
- rb = bfa_ioc_bar0(ioc);
- addr &= BFA_REG_ADDRMSK(ioc);
- /* offset and len sanity check */
- rc = bfad_reg_offset_check(bfa, addr, len);
- if (rc) {
- printk(KERN_INFO "bfad[%d]: Failed reg offset check\n",
- bfad->inst_no);
- kfree(bfad->regdata);
- bfad->regdata = NULL;
- bfad->reglen = 0;
- return -EINVAL;
- }
- reg_addr = rb + addr;
- regbuf = (u32 *)bfad->regdata;
- spin_lock_irqsave(&bfad->bfad_lock, flags);
- for (i = 0; i < len; i++) {
- *regbuf = readl(reg_addr);
- regbuf++;
- reg_addr += sizeof(u32);
- }
- spin_unlock_irqrestore(&bfad->bfad_lock, flags);
- return nbytes;
- }
- static ssize_t
- bfad_debugfs_write_regwr(struct file *file, const char __user *buf,
- size_t nbytes, loff_t *ppos)
- {
- struct bfad_debug_info *debug = file->private_data;
- struct bfad_port_s *port = (struct bfad_port_s *)debug->i_private;
- struct bfad_s *bfad = port->bfad;
- struct bfa_s *bfa = &bfad->bfa;
- struct bfa_ioc_s *ioc = &bfa->ioc;
- int addr, val, rc;
- void __iomem *reg_addr;
- unsigned long flags;
- void *kern_buf;
- kern_buf = kzalloc(nbytes, GFP_KERNEL);
- if (!kern_buf) {
- printk(KERN_INFO "bfad[%d]: Failed to allocate buffer\n",
- bfad->inst_no);
- return -ENOMEM;
- }
- if (copy_from_user(kern_buf, (void __user *)buf, nbytes)) {
- kfree(kern_buf);
- return -ENOMEM;
- }
- rc = sscanf(kern_buf, "%x:%x", &addr, &val);
- if (rc < 2) {
- printk(KERN_INFO
- "bfad[%d]: %s failed to read user buf\n",
- bfad->inst_no, __func__);
- kfree(kern_buf);
- return -EINVAL;
- }
- kfree(kern_buf);
- addr &= BFA_REG_ADDRMSK(ioc); /* offset only 17 bit and word align */
- /* offset and len sanity check */
- rc = bfad_reg_offset_check(bfa, addr, 1);
- if (rc) {
- printk(KERN_INFO
- "bfad[%d]: Failed reg offset check\n",
- bfad->inst_no);
- return -EINVAL;
- }
- reg_addr = (bfa_ioc_bar0(ioc)) + addr;
- spin_lock_irqsave(&bfad->bfad_lock, flags);
- writel(val, reg_addr);
- spin_unlock_irqrestore(&bfad->bfad_lock, flags);
- return nbytes;
- }
- static int
- bfad_debugfs_release(struct inode *inode, struct file *file)
- {
- struct bfad_debug_info *debug = file->private_data;
- if (!debug)
- return 0;
- file->private_data = NULL;
- kfree(debug);
- return 0;
- }
- static int
- bfad_debugfs_release_fwtrc(struct inode *inode, struct file *file)
- {
- struct bfad_debug_info *fw_debug = file->private_data;
- if (!fw_debug)
- return 0;
- if (fw_debug->debug_buffer)
- vfree(fw_debug->debug_buffer);
- file->private_data = NULL;
- kfree(fw_debug);
- return 0;
- }
- static const struct file_operations bfad_debugfs_op_drvtrc = {
- .owner = THIS_MODULE,
- .open = bfad_debugfs_open_drvtrc,
- .llseek = bfad_debugfs_lseek,
- .read = bfad_debugfs_read,
- .release = bfad_debugfs_release,
- };
- static const struct file_operations bfad_debugfs_op_fwtrc = {
- .owner = THIS_MODULE,
- .open = bfad_debugfs_open_fwtrc,
- .llseek = bfad_debugfs_lseek,
- .read = bfad_debugfs_read,
- .release = bfad_debugfs_release_fwtrc,
- };
- static const struct file_operations bfad_debugfs_op_fwsave = {
- .owner = THIS_MODULE,
- .open = bfad_debugfs_open_fwsave,
- .llseek = bfad_debugfs_lseek,
- .read = bfad_debugfs_read,
- .release = bfad_debugfs_release_fwtrc,
- };
- static const struct file_operations bfad_debugfs_op_regrd = {
- .owner = THIS_MODULE,
- .open = bfad_debugfs_open_reg,
- .llseek = bfad_debugfs_lseek,
- .read = bfad_debugfs_read_regrd,
- .write = bfad_debugfs_write_regrd,
- .release = bfad_debugfs_release,
- };
- static const struct file_operations bfad_debugfs_op_regwr = {
- .owner = THIS_MODULE,
- .open = bfad_debugfs_open_reg,
- .llseek = bfad_debugfs_lseek,
- .write = bfad_debugfs_write_regwr,
- .release = bfad_debugfs_release,
- };
- struct bfad_debugfs_entry {
- const char *name;
- umode_t mode;
- const struct file_operations *fops;
- };
- static const struct bfad_debugfs_entry bfad_debugfs_files[] = {
- { "drvtrc", S_IFREG|S_IRUGO, &bfad_debugfs_op_drvtrc, },
- { "fwtrc", S_IFREG|S_IRUGO, &bfad_debugfs_op_fwtrc, },
- { "fwsave", S_IFREG|S_IRUGO, &bfad_debugfs_op_fwsave, },
- { "regrd", S_IFREG|S_IRUGO|S_IWUSR, &bfad_debugfs_op_regrd, },
- { "regwr", S_IFREG|S_IWUSR, &bfad_debugfs_op_regwr, },
- };
- static struct dentry *bfa_debugfs_root;
- static atomic_t bfa_debugfs_port_count;
- inline void
- bfad_debugfs_init(struct bfad_port_s *port)
- {
- struct bfad_s *bfad = port->bfad;
- const struct bfad_debugfs_entry *file;
- char name[64];
- int i;
- if (!bfa_debugfs_enable)
- return;
- /* Setup the BFA debugfs root directory*/
- if (!bfa_debugfs_root) {
- bfa_debugfs_root = debugfs_create_dir("bfa", NULL);
- atomic_set(&bfa_debugfs_port_count, 0);
- if (!bfa_debugfs_root) {
- printk(KERN_WARNING
- "BFA debugfs root dir creation failed\n");
- goto err;
- }
- }
- /* Setup the pci_dev debugfs directory for the port */
- snprintf(name, sizeof(name), "pci_dev:%s", bfad->pci_name);
- if (!port->port_debugfs_root) {
- port->port_debugfs_root =
- debugfs_create_dir(name, bfa_debugfs_root);
- if (!port->port_debugfs_root) {
- printk(KERN_WARNING
- "bfa %s: debugfs root creation failed\n",
- bfad->pci_name);
- goto err;
- }
- atomic_inc(&bfa_debugfs_port_count);
- for (i = 0; i < ARRAY_SIZE(bfad_debugfs_files); i++) {
- file = &bfad_debugfs_files[i];
- bfad->bfad_dentry_files[i] =
- debugfs_create_file(file->name,
- file->mode,
- port->port_debugfs_root,
- port,
- file->fops);
- if (!bfad->bfad_dentry_files[i]) {
- printk(KERN_WARNING
- "bfa %s: debugfs %s creation failed\n",
- bfad->pci_name, file->name);
- goto err;
- }
- }
- }
- err:
- return;
- }
- inline void
- bfad_debugfs_exit(struct bfad_port_s *port)
- {
- struct bfad_s *bfad = port->bfad;
- int i;
- for (i = 0; i < ARRAY_SIZE(bfad_debugfs_files); i++) {
- if (bfad->bfad_dentry_files[i]) {
- debugfs_remove(bfad->bfad_dentry_files[i]);
- bfad->bfad_dentry_files[i] = NULL;
- }
- }
- /* Remove the pci_dev debugfs directory for the port */
- if (port->port_debugfs_root) {
- debugfs_remove(port->port_debugfs_root);
- port->port_debugfs_root = NULL;
- atomic_dec(&bfa_debugfs_port_count);
- }
- /* Remove the BFA debugfs root directory */
- if (atomic_read(&bfa_debugfs_port_count) == 0) {
- debugfs_remove(bfa_debugfs_root);
- bfa_debugfs_root = NULL;
- }
- }