drivers/pci/hotplug/cpqphp_sysfs.c

   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;
 171         loff_t new = -1;
 172
 173         mutex_lock(&cpqphp_mutex);
 174         dbg = file->private_data;
 175
 176         switch (whence) {
 177         case 0:
 178                 new = off;
 179                 break;
 180         case 1:
 181                 new = file->f_pos + off;
 182                 break;
 183         }
 184         if (new < 0 || new > dbg->size) {
 185                 mutex_unlock(&cpqphp_mutex);
 186                 return -EINVAL;
 187         }
 188         mutex_unlock(&cpqphp_mutex);
 189         return (file->f_pos = new);
 190 }
 191
 192 static ssize_t read(struct file *file, char __user *buf,
 193                     size_t nbytes, loff_t *ppos)
 194 {
 195         struct ctrl_dbg *dbg = file->private_data;
 196         return simple_read_from_buffer(buf, nbytes, ppos, dbg->data, dbg->size);
 197 }
 198
 199 static int release(struct inode *inode, struct file *file)
 200 {
 201         struct ctrl_dbg *dbg = file->private_data;
 202
 203         kfree(dbg->data);
 204         kfree(dbg);
 205         return 0;
 206 }
 207
 208 static const struct file_operations debug_ops = {
 209         .owner = THIS_MODULE,
 210         .open = open,
 211         .llseek = lseek,
 212         .read = read,
 213         .release = release,
 214 };
 215
 216 static struct dentry *root;
 217
 218 void cpqhp_initialize_debugfs(void)
 219 {
 220         if (!root)
 221                 root = debugfs_create_dir("cpqhp", NULL);
 222 }
 223
 224 void cpqhp_shutdown_debugfs(void)
 225 {
 226         debugfs_remove(root);
 227 }
 228
 229 void cpqhp_create_debugfs_files(struct controller *ctrl)
 230 {
 231         ctrl->dentry = debugfs_create_file(dev_name(&ctrl->pci_dev->dev),
 232                                            S_IRUGO, root, ctrl, &debug_ops);
 233 }
 234
 235 void cpqhp_remove_debugfs_files(struct controller *ctrl)
 236 {
 237         if (ctrl->dentry)
 238                 debugfs_remove(ctrl->dentry);
 239         ctrl->dentry = NULL;
 240 }
 241