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qdma_debugfs_dev.c
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qdma_debugfs_dev.c
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/*
* This file is part of the Xilinx DMA IP Core driver for Linux
*
* Copyright (c) 2017-present, Xilinx, Inc.
* All rights reserved.
*
* This source code is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* 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.
*
* The full GNU General Public License is included in this distribution in
* the file called "COPYING".
*/
#ifdef DEBUGFS
#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
#include "qdma_debugfs_dev.h"
#include "xdev_regs.h"
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/mutex.h>
#define DEBUGFS_DEV_INFO_SZ (256)
#define DBGFS_ERR_BUFLEN (64)
#define DEBGFS_LINE_SZ (81)
#define DEBGFS_GEN_NAME_SZ (32)
#define REG_DUMP_SIZE_PER_LINE (256)
enum dbgfs_dev_dbg_file_type {
DBGFS_DEV_DBGF_INFO = 0,
DBGFS_DEV_DBGF_REGS = 1,
DBGFS_DEV_DBGF_END,
};
struct dbgfs_dev_dbgf {
char name[DBGFS_DBG_FNAME_SZ];
struct file_operations fops;
};
struct dbgfs_dev_priv {
unsigned long dev_hndl;
char dev_name[QDMA_DEV_NAME_SZ];
char *data;
int datalen;
};
enum bar_type {
DEBUGFS_BAR_CONFIG = 0,
DEBUGFS_BAR_USER = 1,
DEBUGFS_BAR_BYPASS = 2,
};
extern struct dentry *qdma_debugfs_root;
/** structure to hold file ops */
static struct dbgfs_dev_dbgf dbgf[DBGFS_DEV_DBGF_END];
/*****************************************************************************/
/**
* dump_banner() - static helper function to dump a device banner
*
* @param[in] dev_name: qdma device name
* @param[out] buf: buffer to which banner is dumped
* @param[in] buf_sz: size of the buffer passed to func
*
* @return len: length of the buffer printed
*****************************************************************************/
static int dump_banner(char *dev_name, char *buf, int buf_sz)
{
int len = 0;
char seperator[81] = {0};
memset(seperator, '#', 80);
/** Banner consumes three lines, so size should be min 240 (80 * 3)
* If changed, check the minimum buffer size required
*/
if (buf_sz < (3 * DEBGFS_LINE_SZ))
return -1;
len += snprintf(buf + len, buf_sz - len, "%s\n", seperator);
len += snprintf(buf + len, buf_sz - len,
"###\t\t\t\tqdma%s, reg dump\n",
dev_name);
len += snprintf(buf + len, buf_sz - len, "%s\n", seperator);
return len;
}
/*****************************************************************************/
/**
* dump_reg() - static helper function to dump a specific reg
*
* @param[out] buf: buffer to dump the registers
* @param[in] buf_sz: size of the buffer passed to func
* @param[in] rname: register name
* @param[in] rval: register value
*
* @return len: length of the buffer printed
*****************************************************************************/
static int dump_reg(char *buf, int buf_sz, unsigned int raddr, char *rname,
unsigned int rval)
{
int len = 0;
/* length of the line should not exceed 80 chars, so, checking
* for min 80 chars. If below print pattern is changed, check for
* new the buffer size requirement
*/
if (buf_sz < DEBGFS_LINE_SZ)
return -1;
len += sprintf(buf + len, "[%#7x] %-47s %#-10x %u\n",
raddr, rname, rval, rval);
return len;
}
/*****************************************************************************/
/**
* dump_bar_regs() - static helper function to dump a specific bar regs
*
* @param[in] dev_hndl: pointer to xdev device structure
* @param[out] buf: buffer to dump the registers
* @param[in] buf_len: size of the buffer passed
* @param[in] type: bar type
*
* @return len: returns the length buffer printed
*****************************************************************************/
static int dump_bar_regs(unsigned long dev_hndl, char *buf, int buf_len,
enum bar_type type)
{
int num_regs = 0;
int i = 0, j = 0;
unsigned int val = 0;
unsigned int addr = 0;
int len = 0;
int rv;
char name[DEBGFS_GEN_NAME_SZ] = {0};
char bar_name[DEBGFS_GEN_NAME_SZ] = {0};
struct xreg_info *reg_info;
struct xlnx_dma_dev *xdev = (struct xlnx_dma_dev *)dev_hndl;
if (type == DEBUGFS_BAR_CONFIG) {
num_regs = sizeof(qdma_config_regs)/sizeof(qdma_config_regs[0]);
reg_info = qdma_config_regs;
snprintf(bar_name, DEBGFS_GEN_NAME_SZ, "%s #%d", "CONFIG BAR",
xdev->conf.bar_num_config);
} else if (type == DEBUGFS_BAR_USER) {
num_regs = sizeof(qdma_user_regs)/sizeof(qdma_user_regs[0]);
reg_info = qdma_user_regs;
snprintf(bar_name, DEBGFS_GEN_NAME_SZ, "%s #%d", "USER BAR",
xdev->conf.bar_num_user);
}
num_regs -= 1; /* last entry is empty */
/* print the bar name */
len += snprintf(buf + len, buf_len - len, "\n%s\n", bar_name);
/* now print all the registers of the corresponding bar */
for (i = 0; i < num_regs; i++) {
/* if there are more than one register of same type
* loop and print 'repeat' number of times
*/
if (reg_info[i].repeat) {
for (j = 0; j < reg_info[i].repeat; j++) {
memset(name, 0, DEBGFS_GEN_NAME_SZ);
snprintf(name, DEBGFS_GEN_NAME_SZ, "%s_%d",
reg_info[i].name, j);
addr = reg_info[i].addr + (j * 4);
/* read the register value */
val = qdma_device_read_config_register(dev_hndl,
addr);
/* num print address, name & value of reg */
rv = dump_reg(buf + len, buf_len - len, addr,
name, val);
if (rv < 0) {
pr_warn("insufficient space to dump reg vals\n");
return len;
}
len += rv;
}
} else {
addr = reg_info[i].addr;
val = qdma_device_read_config_register(dev_hndl,
addr);
rv = dump_reg(buf + len, buf_len - len, addr,
(char *)reg_info[i].name, val);
if (rv < 0) {
pr_warn("inusfficient space to dump register values\n");
return len;
}
len += rv;
}
}
return len;
}
/*****************************************************************************/
/**
* dbgfs_dump_qdma_regs() - static function to dump qdma device registers
*
* @param[in] xpdev: pointer to qdma pci device structure
* @param[in] buf: buffer to dump the registers
* @param[in] buf_len:size of the buffer passed
*
* @return 0: success
* @return <0: error
*****************************************************************************/
static int dbgfs_dump_qdma_regs(unsigned long dev_hndl, char *dev_name,
char **data, int *data_len)
{
int len = 0;
int rv;
char *buf = NULL;
int num_elem =
((sizeof(qdma_config_regs)/sizeof(struct xreg_info)) + 1) +
((sizeof(qdma_user_regs)/sizeof(struct xreg_info)) + 1);
int buflen = num_elem * REG_DUMP_SIZE_PER_LINE;
/** allocate memory */
buf = (char *) kzalloc(buflen, GFP_KERNEL);
if (!buf)
return -ENOMEM;
/* print the banner with device info */
rv = dump_banner(dev_name, buf + len, buflen - len);
if (rv < 0) {
pr_warn("insufficient space to dump register banner\n");
return len;
}
len += rv;
rv = dump_bar_regs(dev_hndl, buf + len, buflen - len,
DEBUGFS_BAR_USER);
if (rv < 0) {
pr_warn("insufficient space to dump User bar register values\n");
return len;
}
len += rv;
rv = dump_bar_regs(dev_hndl, buf + len, buflen - len,
DEBUGFS_BAR_CONFIG);
if (rv < 0) {
pr_warn("insufficient space to dump Config Bar register values\n");
return len;
}
len += rv;
*data = buf;
*data_len = buflen;
return len;
}
/*****************************************************************************/
/**
* dbgfs_dump_qdma_info() - static function to dump qdma device registers
*
* @xpdev: pointer to qdma pci device structure
* @buf: buffer to dump the registers
* @buf_len:size of the buffer passed
*
* @return 0: success
* @return <0: error
*****************************************************************************/
static int dbgfs_dump_qdma_info(unsigned long dev_hndl, char *dev_name,
char **data, int *data_len)
{
int len = 0;
char *buf = NULL;
int buflen = DEBUGFS_DEV_INFO_SZ;
struct xlnx_dma_dev *xdev = (struct xlnx_dma_dev *)dev_hndl;
struct qdma_dev_conf *conf = NULL;
if (!xdev)
return -EINVAL;
if (xdev_check_hndl(__func__, xdev->conf.pdev, dev_hndl) < 0)
return -EINVAL;
conf = &xdev->conf;
/** allocate memory */
buf = (char *) kzalloc(buflen, GFP_KERNEL);
if (!buf)
return -ENOMEM;
len += snprintf(buf + len, buflen - len, "%-36s: %s\n", "Master PF",
(conf->master_pf) ? "True" : "False");
len += snprintf(buf + len, buflen - len, "%-36s: %d\n", "QBase",
conf->qsets_base);
len += snprintf(buf + len, buflen - len, "%-36s: %d\n", "Max Qsets",
conf->qsets_max);
len += snprintf(buf + len, buflen - len, "%-36s: %d\n",
"Number of VFs", xdev->vf_count);
len += snprintf(buf + len, buflen - len, "%-36s: %d\n",
"Max number of VFs", conf->vf_max);
len += snprintf(buf + len, buflen - len, "%-36s: %s mode\n",
"Driver Mode",
mode_name_list[conf->qdma_drv_mode].name);
*data = buf;
*data_len = buflen;
return len;
}
/*****************************************************************************/
/**
* dev_dbg_file_open() - static function that provides generic open
*
* @param[in] inode: pointer to file inode
* @param[in] fp: pointer to file structure
*
* @return 0: success
* @return <0: error
*****************************************************************************/
static int dev_dbg_file_open(struct inode *inode, struct file *fp)
{
int dev_id = -1;
int rv = 0;
unsigned char dev_name[QDMA_DEV_NAME_SZ] = {0};
unsigned char *lptr = NULL, *rptr = NULL;
struct dentry *dev_dir = NULL;
struct dbgfs_dev_priv *priv = NULL;
struct xlnx_dma_dev *xdev = NULL;
if (!inode || !fp)
return -EINVAL;
dev_dir = fp->f_path.dentry->d_parent;
xdev = inode->i_private;
if (!xdev)
return -EINVAL;
/* convert colon sepearted b:d:f to hex */
rptr = dev_dir->d_iname;
lptr = dev_name;
while (*rptr) {
if (*rptr == ':') {
rptr++;
continue;
}
*lptr++ = *rptr++;
}
/* convert this string as hex integer */
rv = kstrtoint((const char *)dev_name, 16, &dev_id);
if (rv < 0) {
rv = -ENODEV;
return rv;
}
priv = (struct dbgfs_dev_priv *) kzalloc(sizeof(struct dbgfs_dev_priv),
GFP_KERNEL);
if (!priv) {
rv = -ENOMEM;
return rv;
}
priv->dev_hndl = (unsigned long)xdev;
snprintf(priv->dev_name, QDMA_DEV_NAME_SZ, "%s", dev_name);
fp->private_data = priv;
return 0;
}
/*****************************************************************************/
/**
* dev_dbg_file_release() - static function that provides generic release
*
* @param[in] inode: pointer to file inode
* @param[in] fp: pointer to file structure
*
* @return 0: success
* @return <0: error
*****************************************************************************/
static int dev_dbg_file_release(struct inode *inode, struct file *fp)
{
kfree(fp->private_data);
fp->private_data = NULL;
return 0;
}
/*****************************************************************************/
/**
* dev_dbg_file_read() - static function that provides common read
*
* @param[in] fp: pointer to file structure
* @param[out] user_buffer: pointer to user buffer
* @param[in] count: size of data to read
* @param[in/out] ppos: pointer to offset read
* @param[in] type: information type
*
* @return >0: size read
* @return <0: error
*****************************************************************************/
static ssize_t dev_dbg_file_read(struct file *fp, char __user *user_buffer,
size_t count, loff_t *ppos, enum dbgfs_dev_dbg_file_type type)
{
char *buf = NULL;
int buf_len = 0;
int len = 0;
int rv = 0;
struct dbgfs_dev_priv *dev_priv =
(struct dbgfs_dev_priv *)fp->private_data;
if (dev_priv->data == NULL && dev_priv->datalen == 0) {
if (type == DBGFS_DEV_DBGF_INFO) {
rv = dbgfs_dump_qdma_info(dev_priv->dev_hndl,
dev_priv->dev_name, &buf, &buf_len);
} else if (type == DBGFS_DEV_DBGF_REGS) {
rv = dbgfs_dump_qdma_regs(dev_priv->dev_hndl,
dev_priv->dev_name, &buf, &buf_len);
}
if (rv < 0)
goto dev_dbg_file_read_exit;
dev_priv->datalen = rv;
dev_priv->data = buf;
}
buf = dev_priv->data;
len = dev_priv->datalen;
if (!buf)
goto dev_dbg_file_read_exit;
/** write to user buffer */
if (*ppos >= len) {
rv = 0;
goto dev_dbg_file_read_exit;
}
if (*ppos + count > len)
count = len - *ppos;
if (copy_to_user(user_buffer, buf + *ppos, count)) {
rv = -EFAULT;
goto dev_dbg_file_read_exit;
}
*ppos += count;
rv = count;
pr_debug("nuber of bytes written to user space is %zu\n", count);
dev_dbg_file_read_exit:
kfree(buf);
dev_priv->data = NULL;
dev_priv->datalen = 0;
return rv;
}
/*****************************************************************************/
/**
* dev_info_open() - static function that executes info open
*
* @param[in] inode: pointer to file inode
* @param[in] fp: pointer to file structure
*
* @return 0: success
* @return <0: error
*****************************************************************************/
static int dev_info_open(struct inode *inode, struct file *fp)
{
return dev_dbg_file_open(inode, fp);
}
/*****************************************************************************/
/**
* dev_info_read() - static function that executes info read
*
* @param[in] fp: pointer to file structure
* @param[out] user_buffer: pointer to user buffer
* @param[in] count: size of data to read
* @param[in/out] ppos: pointer to offset read
*
* @return >0: size read
* @return <0: error
*****************************************************************************/
static ssize_t dev_info_read(struct file *fp, char __user *user_buffer,
size_t count, loff_t *ppos)
{
return dev_dbg_file_read(fp, user_buffer, count, ppos,
DBGFS_DEV_DBGF_INFO);
}
/*****************************************************************************/
/**
* dev_regs_open() - static function that opens regs debug file
*
* @param[in] inode: pointer to file inode
* @param[in] fp: pointer to file structure
*
* @return 0: success
* @return <0: error
*****************************************************************************/
static int dev_regs_open(struct inode *inode, struct file *fp)
{
return dev_dbg_file_open(inode, fp);
}
/*****************************************************************************/
/**
* dev_regs_read() - static function that executes info read
*
* @param[in] fp: pointer to file structure
* @param[out] user_buffer: pointer to user buffer
* @param[in] count: size of data to read
* @param[in/out] ppos: pointer to offset read
*
* @return >0: size read
* @return <0: error
*****************************************************************************/
static ssize_t dev_regs_read(struct file *fp, char __user *user_buffer,
size_t count, loff_t *ppos)
{
return dev_dbg_file_read(fp, user_buffer, count, ppos,
DBGFS_DEV_DBGF_REGS);
}
/*****************************************************************************/
/**
* create_dev_dbg_files() - static function to create queue debug files
*
* @param[in] dev_root: debugfs root for the device
*
* @return >0: size read
* @return <0: error
*****************************************************************************/
int create_dev_dbg_files(struct xlnx_dma_dev *xdev, struct dentry *dev_root)
{
struct dentry *fp[DBGFS_DEV_DBGF_END] = { NULL };
struct file_operations *fops = NULL;
int i = 0;
memset(dbgf, 0, sizeof(struct dbgfs_dev_dbgf) * DBGFS_DEV_DBGF_END);
for (i = 0; i < DBGFS_DEV_DBGF_END; i++) {
fops = &dbgf[i].fops;
fops->owner = THIS_MODULE;
switch (i) {
case DBGFS_DEV_DBGF_INFO:
snprintf(dbgf[i].name, 64, "%s", "info");
fops->open = dev_info_open;
fops->read = dev_info_read;
fops->release = dev_dbg_file_release;
break;
case DBGFS_DEV_DBGF_REGS:
snprintf(dbgf[i].name, 64, "%s", "regs");
fops->open = dev_regs_open;
fops->read = dev_regs_read;
fops->release = dev_dbg_file_release;
break;
}
}
for (i = 0; i < DBGFS_DEV_DBGF_END; i++) {
fp[i] = debugfs_create_file(dbgf[i].name, 0644, dev_root,
xdev, &dbgf[i].fops);
if (!fp[i])
return -1;
}
return 0;
}
/*****************************************************************************/
/**
* dbgfs_dev_init() - function to initialize device debugfs files
*
* @param[in] xdev: Xilinx dma device
* @param[in] qdma_debugfs_root: root file in debugfs
*
* @return =0: success
* @return <0: error
*****************************************************************************/
int dbgfs_dev_init(struct xlnx_dma_dev *xdev)
{
char dname[QDMA_DEV_NAME_SZ] = {0};
struct dentry *dbgfs_dev_root = NULL;
struct dentry *dbgfs_queues_root = NULL;
struct pci_dev *pdev = xdev->conf.pdev;
int rv = 0;
snprintf(dname, QDMA_DEV_NAME_SZ, "%02x:%02x:%x",
pdev->bus->number,
PCI_SLOT(pdev->devfn),
PCI_FUNC(pdev->devfn));
/* create a directory for the device in debugfs */
dbgfs_dev_root = debugfs_create_dir(dname, qdma_debugfs_root);
if (!dbgfs_dev_root) {
pr_err("Failed to create device direcotry\n");
return -1;
}
xdev->dbgfs_dev_root = dbgfs_dev_root;
/* create debug files for qdma device */
rv = create_dev_dbg_files(xdev, dbgfs_dev_root);
if (rv < 0) {
pr_err("Failed to create device debug files\n");
goto dbgfs_dev_init_fail;
}
/* create a directory for the queues in debugfs */
dbgfs_queues_root = debugfs_create_dir("queues", xdev->dbgfs_dev_root);
if (!dbgfs_queues_root) {
pr_err("Failed to create queueus directory under device directory\n");
goto dbgfs_dev_init_fail;
}
xdev->dbgfs_queues_root = dbgfs_queues_root;
spin_lock_init(&xdev->qidx_lock);
return 0;
dbgfs_dev_init_fail:
debugfs_remove_recursive(dbgfs_dev_root);
return -1;
}
/*****************************************************************************/
/**
* dbgfs_dev_exit() - function to cleanup device debugfs files
*
* @param[in] xdev: Xilinx dma device
*
*****************************************************************************/
void dbgfs_dev_exit(struct xlnx_dma_dev *xdev)
{
if (xdev->dbgfs_dev_root)
debugfs_remove_recursive(xdev->dbgfs_dev_root);
xdev->dbgfs_dev_root = NULL;
xdev->dbgfs_queues_root = NULL;
}
#endif