linux/drivers/pci/hotplug/cpqphp_sysfs.c
<<
>>
Prefs
   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
  41static DEFINE_MUTEX(cpqphp_mutex);
  42static 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
  80static 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
 128static 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
 137struct ctrl_dbg {
 138        int size;
 139        char *data;
 140        struct controller *ctrl;
 141};
 142
 143#define MAX_OUTPUT      (4*PAGE_SIZE)
 144
 145static 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;
 163exit:
 164        mutex_unlock(&cpqphp_mutex);
 165        return retval;
 166}
 167
 168static 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
 192static 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
 199static 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
 208static const struct file_operations debug_ops = {
 209        .owner = THIS_MODULE,
 210        .open = open,
 211        .llseek = lseek,
 212        .read = read,
 213        .release = release,
 214};
 215
 216static struct dentry *root;
 217
 218void cpqhp_initialize_debugfs(void)
 219{
 220        if (!root)
 221                root = debugfs_create_dir("cpqhp", NULL);
 222}
 223
 224void cpqhp_shutdown_debugfs(void)
 225{
 226        debugfs_remove(root);
 227}
 228
 229void 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
 235void cpqhp_remove_debugfs_files(struct controller *ctrl)
 236{
 237        if (ctrl->dentry)
 238                debugfs_remove(ctrl->dentry);
 239        ctrl->dentry = NULL;
 240}
 241
 242