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/smp_lock.h>
  38 #include <linux/debugfs.h>
  39 #include "cpqphp.h"
  40
  41 static int show_ctrl (struct controller *ctrl, char *buf)
  42 {
  43         char *out = buf;
  44         int index;
  45         struct pci_resource *res;
  46
  47         out += sprintf(buf, "Free resources: memory\n");
  48         index = 11;
  49         res = ctrl->mem_head;
  50         while (res && index--) {
  51                 out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
  52                 res = res->next;
  53         }
  54         out += sprintf(out, "Free resources: prefetchable memory\n");
  55         index = 11;
  56         res = ctrl->p_mem_head;
  57         while (res && index--) {
  58                 out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
  59                 res = res->next;
  60         }
  61         out += sprintf(out, "Free resources: IO\n");
  62         index = 11;
  63         res = ctrl->io_head;
  64         while (res && index--) {
  65                 out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
  66                 res = res->next;
  67         }
  68         out += sprintf(out, "Free resources: bus numbers\n");
  69         index = 11;
  70         res = ctrl->bus_head;
  71         while (res && index--) {
  72                 out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
  73                 res = res->next;
  74         }
  75
  76         return out - buf;
  77 }
  78
  79 static int show_dev (struct controller *ctrl, char *buf)
  80 {
  81         char * out = buf;
  82         int index;
  83         struct pci_resource *res;
  84         struct pci_func *new_slot;
  85         struct slot *slot;
  86
  87         slot = ctrl->slot;
  88
  89         while (slot) {
  90                 new_slot = cpqhp_slot_find(slot->bus, slot->device, 0);
  91                 if (!new_slot)
  92                         break;
  93                 out += sprintf(out, "assigned resources: memory\n");
  94                 index = 11;
  95                 res = new_slot->mem_head;
  96                 while (res && index--) {
  97                         out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
  98                         res = res->next;
  99                 }
 100                 out += sprintf(out, "assigned resources: prefetchable memory\n");
 101                 index = 11;
 102                 res = new_slot->p_mem_head;
 103                 while (res && index--) {
 104                         out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
 105                         res = res->next;
 106                 }
 107                 out += sprintf(out, "assigned resources: IO\n");
 108                 index = 11;
 109                 res = new_slot->io_head;
 110                 while (res && index--) {
 111                         out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
 112                         res = res->next;
 113                 }
 114                 out += sprintf(out, "assigned resources: bus numbers\n");
 115                 index = 11;
 116                 res = new_slot->bus_head;
 117                 while (res && index--) {
 118                         out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
 119                         res = res->next;
 120                 }
 121                 slot=slot->next;
 122         }
 123
 124         return out - buf;
 125 }
 126
 127 static int spew_debug_info(struct controller *ctrl, char *data, int size)
 128 {
 129         int used;
 130
 131         used = size - show_ctrl(ctrl, data);
 132         used = (size - used) - show_dev(ctrl, &data[used]);
 133         return used;
 134 }
 135
 136 struct ctrl_dbg {
 137         int size;
 138         char *data;
 139         struct controller *ctrl;
 140 };
 141
 142 #define MAX_OUTPUT      (4*PAGE_SIZE)
 143
 144 static int open(struct inode *inode, struct file *file)
 145 {
 146         struct controller *ctrl = inode->i_private;
 147         struct ctrl_dbg *dbg;
 148         int retval = -ENOMEM;
 149
 150         lock_kernel();
 151         dbg = kmalloc(sizeof(*dbg), GFP_KERNEL);
 152         if (!dbg)
 153                 goto exit;
 154         dbg->data = kmalloc(MAX_OUTPUT, GFP_KERNEL);
 155         if (!dbg->data) {
 156                 kfree(dbg);
 157                 goto exit;
 158         }
 159         dbg->size = spew_debug_info(ctrl, dbg->data, MAX_OUTPUT);
 160         file->private_data = dbg;
 161         retval = 0;
 162 exit:
 163         unlock_kernel();
 164         return retval;
 165 }
 166
 167 static loff_t lseek(struct file *file, loff_t off, int whence)
 168 {
 169         struct ctrl_dbg *dbg;
 170         loff_t new = -1;
 171
 172         lock_kernel();
 173         dbg = file->private_data;
 174
 175         switch (whence) {
 176         case 0:
 177                 new = off;
 178                 break;
 179         case 1:
 180                 new = file->f_pos + off;
 181                 break;
 182         }
 183         if (new < 0 || new > dbg->size) {
 184                 unlock_kernel();
 185                 return -EINVAL;
 186         }
 187         unlock_kernel();
 188         return (file->f_pos = new);
 189 }
 190
 191 static ssize_t read(struct file *file, char __user *buf,
 192                     size_t nbytes, loff_t *ppos)
 193 {
 194         struct ctrl_dbg *dbg = file->private_data;
 195         return simple_read_from_buffer(buf, nbytes, ppos, dbg->data, dbg->size);
 196 }
 197
 198 static int release(struct inode *inode, struct file *file)
 199 {
 200         struct ctrl_dbg *dbg = file->private_data;
 201
 202         kfree(dbg->data);
 203         kfree(dbg);
 204         return 0;
 205 }
 206
 207 static const struct file_operations debug_ops = {
 208         .owner = THIS_MODULE,
 209         .open = open,
 210         .llseek = lseek,
 211         .read = read,
 212         .release = release,
 213 };
 214
 215 static struct dentry *root;
 216
 217 void cpqhp_initialize_debugfs(void)
 218 {
 219         if (!root)
 220                 root = debugfs_create_dir("cpqhp", NULL);
 221 }
 222
 223 void cpqhp_shutdown_debugfs(void)
 224 {
 225         debugfs_remove(root);
 226 }
 227
 228 void cpqhp_create_debugfs_files(struct controller *ctrl)
 229 {
 230         ctrl->dentry = debugfs_create_file(dev_name(&ctrl->pci_dev->dev),
 231                                            S_IRUGO, root, ctrl, &debug_ops);
 232 }
 233
 234 void cpqhp_remove_debugfs_files(struct controller *ctrl)
 235 {
 236         if (ctrl->dentry)
 237                 debugfs_remove(ctrl->dentry);
 238         ctrl->dentry = NULL;
 239 }
 240