1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Compaq Hot Plug Controller Driver
4 *
5 * Copyright (C) 1995,2001 Compaq Computer Corporation
6 * Copyright (C) 2001,2003 Greg Kroah-Hartman (greg@kroah.com)
7 * Copyright (C) 2001 IBM Corp.
8 *
9 * All rights reserved.
10 *
11 * Send feedback to <greg@kroah.com>
12 *
13 */
14
15#include <linux/module.h>
16#include <linux/kernel.h>
17#include <linux/slab.h>
18#include <linux/types.h>
19#include <linux/proc_fs.h>
20#include <linux/workqueue.h>
21#include <linux/pci.h>
22#include <linux/pci_hotplug.h>
23#include <linux/mutex.h>
24#include <linux/debugfs.h>
25#include "cpqphp.h"
26
27static DEFINE_MUTEX(cpqphp_mutex);
28static int show_ctrl(struct controller *ctrl, char *buf)
29{
30	char *out = buf;
31	int index;
32	struct pci_resource *res;
33
34	out += sprintf(buf, "Free resources: memory\n");
35	index = 11;
36	res = ctrl->mem_head;
37	while (res && index--) {
38		out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
39		res = res->next;
40	}
41	out += sprintf(out, "Free resources: prefetchable memory\n");
42	index = 11;
43	res = ctrl->p_mem_head;
44	while (res && index--) {
45		out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
46		res = res->next;
47	}
48	out += sprintf(out, "Free resources: IO\n");
49	index = 11;
50	res = ctrl->io_head;
51	while (res && index--) {
52		out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
53		res = res->next;
54	}
55	out += sprintf(out, "Free resources: bus numbers\n");
56	index = 11;
57	res = ctrl->bus_head;
58	while (res && index--) {
59		out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
60		res = res->next;
61	}
62
63	return out - buf;
64}
65
66static int show_dev(struct controller *ctrl, char *buf)
67{
68	char *out = buf;
69	int index;
70	struct pci_resource *res;
71	struct pci_func *new_slot;
72	struct slot *slot;
73
74	slot = ctrl->slot;
75
76	while (slot) {
77		new_slot = cpqhp_slot_find(slot->bus, slot->device, 0);
78		if (!new_slot)
79			break;
80		out += sprintf(out, "assigned resources: memory\n");
81		index = 11;
82		res = new_slot->mem_head;
83		while (res && index--) {
84			out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
85			res = res->next;
86		}
87		out += sprintf(out, "assigned resources: prefetchable memory\n");
88		index = 11;
89		res = new_slot->p_mem_head;
90		while (res && index--) {
91			out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
92			res = res->next;
93		}
94		out += sprintf(out, "assigned resources: IO\n");
95		index = 11;
96		res = new_slot->io_head;
97		while (res && index--) {
98			out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
99			res = res->next;
100		}
101		out += sprintf(out, "assigned resources: bus numbers\n");
102		index = 11;
103		res = new_slot->bus_head;
104		while (res && index--) {
105			out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
106			res = res->next;
107		}
108		slot = slot->next;
109	}
110
111	return out - buf;
112}
113
114static int spew_debug_info(struct controller *ctrl, char *data, int size)
115{
116	int used;
117
118	used = size - show_ctrl(ctrl, data);
119	used = (size - used) - show_dev(ctrl, &data[used]);
120	return used;
121}
122
123struct ctrl_dbg {
124	int size;
125	char *data;
126	struct controller *ctrl;
127};
128
129#define MAX_OUTPUT	(4*PAGE_SIZE)
130
131static int open(struct inode *inode, struct file *file)
132{
133	struct controller *ctrl = inode->i_private;
134	struct ctrl_dbg *dbg;
135	int retval = -ENOMEM;
136
137	mutex_lock(&cpqphp_mutex);
138	dbg = kmalloc(sizeof(*dbg), GFP_KERNEL);
139	if (!dbg)
140		goto exit;
141	dbg->data = kmalloc(MAX_OUTPUT, GFP_KERNEL);
142	if (!dbg->data) {
143		kfree(dbg);
144		goto exit;
145	}
146	dbg->size = spew_debug_info(ctrl, dbg->data, MAX_OUTPUT);
147	file->private_data = dbg;
148	retval = 0;
149exit:
150	mutex_unlock(&cpqphp_mutex);
151	return retval;
152}
153
154static loff_t lseek(struct file *file, loff_t off, int whence)
155{
156	struct ctrl_dbg *dbg = file->private_data;
157	return fixed_size_llseek(file, off, whence, dbg->size);
158}
159
160static ssize_t read(struct file *file, char __user *buf,
161		    size_t nbytes, loff_t *ppos)
162{
163	struct ctrl_dbg *dbg = file->private_data;
164	return simple_read_from_buffer(buf, nbytes, ppos, dbg->data, dbg->size);
165}
166
167static int release(struct inode *inode, struct file *file)
168{
169	struct ctrl_dbg *dbg = file->private_data;
170
171	kfree(dbg->data);
172	kfree(dbg);
173	return 0;
174}
175
176static const struct file_operations debug_ops = {
177	.owner = THIS_MODULE,
178	.open = open,
179	.llseek = lseek,
180	.read = read,
181	.release = release,
182};
183
184static struct dentry *root;
185
186void cpqhp_initialize_debugfs(void)
187{
188	if (!root)
189		root = debugfs_create_dir("cpqhp", NULL);
190}
191
192void cpqhp_shutdown_debugfs(void)
193{
194	debugfs_remove(root);
195}
196
197void cpqhp_create_debugfs_files(struct controller *ctrl)
198{
199	ctrl->dentry = debugfs_create_file(dev_name(&ctrl->pci_dev->dev),
200					   S_IRUGO, root, ctrl, &debug_ops);
201}
202
203void cpqhp_remove_debugfs_files(struct controller *ctrl)
204{
205	debugfs_remove(ctrl->dentry);
206	ctrl->dentry = NULL;
207}
208
209