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