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);
show_ctrl(struct controller * ctrl,char * buf)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
show_dev(struct controller * ctrl,char * buf)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
spew_debug_info(struct controller * ctrl,char * data,int size)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
open(struct inode * inode,struct file * file)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
lseek(struct file * file,loff_t off,int whence)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
read(struct file * file,char __user * buf,size_t nbytes,loff_t * ppos)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
release(struct inode * inode,struct file * file)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
cpqhp_initialize_debugfs(void)186 void cpqhp_initialize_debugfs(void)
187 {
188 if (!root)
189 root = debugfs_create_dir("cpqhp", NULL);
190 }
191
cpqhp_shutdown_debugfs(void)192 void cpqhp_shutdown_debugfs(void)
193 {
194 debugfs_remove(root);
195 }
196
cpqhp_create_debugfs_files(struct controller * ctrl)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
cpqhp_remove_debugfs_files(struct controller * ctrl)203 void cpqhp_remove_debugfs_files(struct controller *ctrl)
204 {
205 debugfs_remove(ctrl->dentry);
206 ctrl->dentry = NULL;
207 }
208
209