https://github.com/torvalds/linux
Tip revision: b3a9e3b9622ae10064826dccb4f7a52bd88c7407 authored by Linus Torvalds on 14 June 2020, 19:45:04 UTC
Linux 5.8-rc1
Linux 5.8-rc1
Tip revision: b3a9e3b
bfad_debugfs.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2005-2014 Brocade Communications Systems, Inc.
* Copyright (c) 2014- QLogic Corporation.
* All rights reserved
* www.qlogic.com
*
* Linux driver for QLogic BR-series Fibre Channel Host Bus Adapter.
*/
#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 = vzalloc(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;
}
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 = vzalloc(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;
}
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, rc, i;
u32 len;
u32 *regbuf;
void __iomem *rb, *reg_addr;
unsigned long flags;
void *kern_buf;
kern_buf = memdup_user(buf, nbytes);
if (IS_ERR(kern_buf))
return PTR_ERR(kern_buf);
rc = sscanf(kern_buf, "%x:%x", &addr, &len);
if (rc < 2 || len > (UINT_MAX >> 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 = memdup_user(buf, nbytes);
if (IS_ERR(kern_buf))
return PTR_ERR(kern_buf);
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);
}
/* 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);
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);
}
}
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;
}
}