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