1 /*
2  * Compaq Hot Plug Controller Driver
3  *
4  * Copyright (C) 1995,2001 Compaq Computer Corporation
5  * Copyright (C) 2001,2003 Greg Kroah-Hartman (greg@kroah.com)
6  * Copyright (C) 2001 IBM Corp.
7  *
8  * All rights reserved.
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or (at
13  * your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful, but
16  * WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
18  * NON INFRINGEMENT.  See the GNU General Public License for more
19  * details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program; if not, write to the Free Software
23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24  *
25  * Send feedback to <greg@kroah.com>
26  *
27  */
28 
29 #include <linux/module.h>
30 #include <linux/kernel.h>
31 #include <linux/slab.h>
32 #include <linux/types.h>
33 #include <linux/proc_fs.h>
34 #include <linux/workqueue.h>
35 #include <linux/pci.h>
36 #include <linux/pci_hotplug.h>
37 #include <linux/mutex.h>
38 #include <linux/debugfs.h>
39 #include "cpqphp.h"
40 
41 static DEFINE_MUTEX(cpqphp_mutex);
42 static int show_ctrl(struct controller *ctrl, char *buf)
43 {
44 	char *out = buf;
45 	int index;
46 	struct pci_resource *res;
47 
48 	out += sprintf(buf, "Free resources: memory\n");
49 	index = 11;
50 	res = ctrl->mem_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: prefetchable memory\n");
56 	index = 11;
57 	res = ctrl->p_mem_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 	out += sprintf(out, "Free resources: IO\n");
63 	index = 11;
64 	res = ctrl->io_head;
65 	while (res && index--) {
66 		out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
67 		res = res->next;
68 	}
69 	out += sprintf(out, "Free resources: bus numbers\n");
70 	index = 11;
71 	res = ctrl->bus_head;
72 	while (res && index--) {
73 		out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
74 		res = res->next;
75 	}
76 
77 	return out - buf;
78 }
79 
80 static int show_dev(struct controller *ctrl, char *buf)
81 {
82 	char *out = buf;
83 	int index;
84 	struct pci_resource *res;
85 	struct pci_func *new_slot;
86 	struct slot *slot;
87 
88 	slot = ctrl->slot;
89 
90 	while (slot) {
91 		new_slot = cpqhp_slot_find(slot->bus, slot->device, 0);
92 		if (!new_slot)
93 			break;
94 		out += sprintf(out, "assigned resources: memory\n");
95 		index = 11;
96 		res = new_slot->mem_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: prefetchable memory\n");
102 		index = 11;
103 		res = new_slot->p_mem_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 		out += sprintf(out, "assigned resources: IO\n");
109 		index = 11;
110 		res = new_slot->io_head;
111 		while (res && index--) {
112 			out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
113 			res = res->next;
114 		}
115 		out += sprintf(out, "assigned resources: bus numbers\n");
116 		index = 11;
117 		res = new_slot->bus_head;
118 		while (res && index--) {
119 			out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
120 			res = res->next;
121 		}
122 		slot = slot->next;
123 	}
124 
125 	return out - buf;
126 }
127 
128 static int spew_debug_info(struct controller *ctrl, char *data, int size)
129 {
130 	int used;
131 
132 	used = size - show_ctrl(ctrl, data);
133 	used = (size - used) - show_dev(ctrl, &data[used]);
134 	return used;
135 }
136 
137 struct ctrl_dbg {
138 	int size;
139 	char *data;
140 	struct controller *ctrl;
141 };
142 
143 #define MAX_OUTPUT	(4*PAGE_SIZE)
144 
145 static int open(struct inode *inode, struct file *file)
146 {
147 	struct controller *ctrl = inode->i_private;
148 	struct ctrl_dbg *dbg;
149 	int retval = -ENOMEM;
150 
151 	mutex_lock(&cpqphp_mutex);
152 	dbg = kmalloc(sizeof(*dbg), GFP_KERNEL);
153 	if (!dbg)
154 		goto exit;
155 	dbg->data = kmalloc(MAX_OUTPUT, GFP_KERNEL);
156 	if (!dbg->data) {
157 		kfree(dbg);
158 		goto exit;
159 	}
160 	dbg->size = spew_debug_info(ctrl, dbg->data, MAX_OUTPUT);
161 	file->private_data = dbg;
162 	retval = 0;
163 exit:
164 	mutex_unlock(&cpqphp_mutex);
165 	return retval;
166 }
167 
168 static loff_t lseek(struct file *file, loff_t off, int whence)
169 {
170 	struct ctrl_dbg *dbg = file->private_data;
171 	return fixed_size_llseek(file, off, whence, dbg->size);
172 }
173 
174 static ssize_t read(struct file *file, char __user *buf,
175 		    size_t nbytes, loff_t *ppos)
176 {
177 	struct ctrl_dbg *dbg = file->private_data;
178 	return simple_read_from_buffer(buf, nbytes, ppos, dbg->data, dbg->size);
179 }
180 
181 static int release(struct inode *inode, struct file *file)
182 {
183 	struct ctrl_dbg *dbg = file->private_data;
184 
185 	kfree(dbg->data);
186 	kfree(dbg);
187 	return 0;
188 }
189 
190 static const struct file_operations debug_ops = {
191 	.owner = THIS_MODULE,
192 	.open = open,
193 	.llseek = lseek,
194 	.read = read,
195 	.release = release,
196 };
197 
198 static struct dentry *root;
199 
200 void cpqhp_initialize_debugfs(void)
201 {
202 	if (!root)
203 		root = debugfs_create_dir("cpqhp", NULL);
204 }
205 
206 void cpqhp_shutdown_debugfs(void)
207 {
208 	debugfs_remove(root);
209 }
210 
211 void cpqhp_create_debugfs_files(struct controller *ctrl)
212 {
213 	ctrl->dentry = debugfs_create_file(dev_name(&ctrl->pci_dev->dev),
214 					   S_IRUGO, root, ctrl, &debug_ops);
215 }
216 
217 void cpqhp_remove_debugfs_files(struct controller *ctrl)
218 {
219 	debugfs_remove(ctrl->dentry);
220 	ctrl->dentry = NULL;
221 }
222 
223