]> Git Repo - J-linux.git/blob - drivers/pci/hotplug/cpqphp_sysfs.c
Merge tag 'vfs-6.13-rc7.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
[J-linux.git] / drivers / pci / hotplug / cpqphp_sysfs.c
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
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 };
127
128 #define MAX_OUTPUT      (4*PAGE_SIZE)
129
130 static 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(sizeof(*dbg), GFP_KERNEL);
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;
148 exit:
149         mutex_unlock(&cpqphp_mutex);
150         return retval;
151 }
152
153 static 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
159 static 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
166 static 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
175 static const struct file_operations debug_ops = {
176         .owner = THIS_MODULE,
177         .open = open,
178         .llseek = lseek,
179         .read = read,
180         .release = release,
181 };
182
183 static struct dentry *root;
184
185 void cpqhp_initialize_debugfs(void)
186 {
187         if (!root)
188                 root = debugfs_create_dir("cpqhp", NULL);
189 }
190
191 void cpqhp_shutdown_debugfs(void)
192 {
193         debugfs_remove(root);
194 }
195
196 void 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
202 void cpqhp_remove_debugfs_files(struct controller *ctrl)
203 {
204         debugfs_remove(ctrl->dentry);
205         ctrl->dentry = NULL;
206 }
207
This page took 0.037701 seconds and 4 git commands to generate.