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// SPDX-License-Identifier: GPL-2.0+
/*
* Compaq Hot Plug Controller Driver
*
* Copyright (C) 1995,2001 Compaq Computer Corporation
* Copyright (C) 2001,2003 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (C) 2001 IBM Corp.
*
* All rights reserved.
*
* Send feedback to <greg@kroah.com>
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/workqueue.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/mutex.h>
#include <linux/debugfs.h>
#include "cpqphp.h"
static DEFINE_MUTEX(cpqphp_mutex);
static int show_ctrl(struct controller *ctrl, char *buf)
{
char *out = buf;
int index;
struct pci_resource *res;
out += sprintf(buf, "Free resources: memory\n");
index = 11;
res = ctrl->mem_head;
while (res && index--) {
out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
res = res->next;
}
out += sprintf(out, "Free resources: prefetchable memory\n");
index = 11;
res = ctrl->p_mem_head;
while (res && index--) {
out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
res = res->next;
}
out += sprintf(out, "Free resources: IO\n");
index = 11;
res = ctrl->io_head;
while (res && index--) {
out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
res = res->next;
}
out += sprintf(out, "Free resources: bus numbers\n");
index = 11;
res = ctrl->bus_head;
while (res && index--) {
out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
res = res->next;
}
return out - buf;
}
static int show_dev(struct controller *ctrl, char *buf)
{
char *out = buf;
int index;
struct pci_resource *res;
struct pci_func *new_slot;
struct slot *slot;
slot = ctrl->slot;
while (slot) {
new_slot = cpqhp_slot_find(slot->bus, slot->device, 0);
if (!new_slot)
break;
out += sprintf(out, "assigned resources: memory\n");
index = 11;
res = new_slot->mem_head;
while (res && index--) {
out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
res = res->next;
}
out += sprintf(out, "assigned resources: prefetchable memory\n");
index = 11;
res = new_slot->p_mem_head;
while (res && index--) {
out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
res = res->next;
}
out += sprintf(out, "assigned resources: IO\n");
index = 11;
res = new_slot->io_head;
while (res && index--) {
out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
res = res->next;
}
out += sprintf(out, "assigned resources: bus numbers\n");
index = 11;
res = new_slot->bus_head;
while (res && index--) {
out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
res = res->next;
}
slot = slot->next;
}
return out - buf;
}
static int spew_debug_info(struct controller *ctrl, char *data, int size)
{
int used;
used = size - show_ctrl(ctrl, data);
used = (size - used) - show_dev(ctrl, &data[used]);
return used;
}
struct ctrl_dbg {
int size;
char *data;
struct controller *ctrl;
};
#define MAX_OUTPUT (4*PAGE_SIZE)
static int open(struct inode *inode, struct file *file)
{
struct controller *ctrl = inode->i_private;
struct ctrl_dbg *dbg;
int retval = -ENOMEM;
mutex_lock(&cpqphp_mutex);
dbg = kmalloc(sizeof(*dbg), GFP_KERNEL);
if (!dbg)
goto exit;
dbg->data = kmalloc(MAX_OUTPUT, GFP_KERNEL);
if (!dbg->data) {
kfree(dbg);
goto exit;
}
dbg->size = spew_debug_info(ctrl, dbg->data, MAX_OUTPUT);
file->private_data = dbg;
retval = 0;
exit:
mutex_unlock(&cpqphp_mutex);
return retval;
}
static loff_t lseek(struct file *file, loff_t off, int whence)
{
struct ctrl_dbg *dbg = file->private_data;
return fixed_size_llseek(file, off, whence, dbg->size);
}
static ssize_t read(struct file *file, char __user *buf,
size_t nbytes, loff_t *ppos)
{
struct ctrl_dbg *dbg = file->private_data;
return simple_read_from_buffer(buf, nbytes, ppos, dbg->data, dbg->size);
}
static int release(struct inode *inode, struct file *file)
{
struct ctrl_dbg *dbg = file->private_data;
kfree(dbg->data);
kfree(dbg);
return 0;
}
static const struct file_operations debug_ops = {
.owner = THIS_MODULE,
.open = open,
.llseek = lseek,
.read = read,
.release = release,
};
static struct dentry *root;
void cpqhp_initialize_debugfs(void)
{
if (!root)
root = debugfs_create_dir("cpqhp", NULL);
}
void cpqhp_shutdown_debugfs(void)
{
debugfs_remove(root);
}
void cpqhp_create_debugfs_files(struct controller *ctrl)
{
ctrl->dentry = debugfs_create_file(dev_name(&ctrl->pci_dev->dev),
S_IRUGO, root, ctrl, &debug_ops);
}
void cpqhp_remove_debugfs_files(struct controller *ctrl)
{
debugfs_remove(ctrl->dentry);
ctrl->dentry = NULL;
}
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