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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 ([email protected])
7 * Copyright (C) 2001 IBM Corp.
8 *
9 * All rights reserved.
10 *
11 * Send feedback to <[email protected]>
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};
127
128#define MAX_OUTPUT (4*PAGE_SIZE)
129
130static int open(struct inode *inode, struct file *file)
131{
132 struct controller *ctrl = inode->i_private;
133 struct ctrl_dbg *dbg;
134 int retval = -ENOMEM;
135
136 mutex_lock(&cpqphp_mutex);
137 dbg = kmalloc_obj(*dbg);
138 if (!dbg)
139 goto exit;
140 dbg->data = kmalloc(MAX_OUTPUT, GFP_KERNEL);
141 if (!dbg->data) {
142 kfree(dbg);
143 goto exit;
144 }
145 dbg->size = spew_debug_info(ctrl, dbg->data, MAX_OUTPUT);
146 file->private_data = dbg;
147 retval = 0;
148exit:
149 mutex_unlock(&cpqphp_mutex);
150 return retval;
151}
152
153static loff_t lseek(struct file *file, loff_t off, int whence)
154{
155 struct ctrl_dbg *dbg = file->private_data;
156 return fixed_size_llseek(file, off, whence, dbg->size);
157}
158
159static ssize_t read(struct file *file, char __user *buf,
160 size_t nbytes, loff_t *ppos)
161{
162 struct ctrl_dbg *dbg = file->private_data;
163 return simple_read_from_buffer(buf, nbytes, ppos, dbg->data, dbg->size);
164}
165
166static int release(struct inode *inode, struct file *file)
167{
168 struct ctrl_dbg *dbg = file->private_data;
169
170 kfree(dbg->data);
171 kfree(dbg);
172 return 0;
173}
174
175static const struct file_operations debug_ops = {
176 .owner = THIS_MODULE,
177 .open = open,
178 .llseek = lseek,
179 .read = read,
180 .release = release,
181};
182
183static struct dentry *root;
184
185void cpqhp_initialize_debugfs(void)
186{
187 if (!root)
188 root = debugfs_create_dir("cpqhp", NULL);
189}
190
191void cpqhp_shutdown_debugfs(void)
192{
193 debugfs_remove(root);
194}
195
196void cpqhp_create_debugfs_files(struct controller *ctrl)
197{
198 ctrl->dentry = debugfs_create_file(dev_name(&ctrl->pci_dev->dev),
199 S_IRUGO, root, ctrl, &debug_ops);
200}
201
202void cpqhp_remove_debugfs_files(struct controller *ctrl)
203{
204 debugfs_remove(ctrl->dentry);
205 ctrl->dentry = NULL;
206}
207