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