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 
27 static DEFINE_MUTEX(cpqphp_mutex);
28 static 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 
66 static 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 
114 static 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 
123 struct ctrl_dbg {
124 	int size;
125 	char *data;
126 	struct controller *ctrl;
127 };
128 
129 #define MAX_OUTPUT	(4*PAGE_SIZE)
130 
131 static 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;
149 exit:
150 	mutex_unlock(&cpqphp_mutex);
151 	return retval;
152 }
153 
154 static 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 
160 static 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 
167 static 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 
176 static const struct file_operations debug_ops = {
177 	.owner = THIS_MODULE,
178 	.open = open,
179 	.llseek = lseek,
180 	.read = read,
181 	.release = release,
182 };
183 
184 static struct dentry *root;
185 
186 void cpqhp_initialize_debugfs(void)
187 {
188 	if (!root)
189 		root = debugfs_create_dir("cpqhp", NULL);
190 }
191 
192 void cpqhp_shutdown_debugfs(void)
193 {
194 	debugfs_remove(root);
195 }
196 
197 void 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 
203 void cpqhp_remove_debugfs_files(struct controller *ctrl)
204 {
205 	debugfs_remove(ctrl->dentry);
206 	ctrl->dentry = NULL;
207 }
208 
209