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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
The Compaq PCI Hotplug driver was creating 2 sysfs files that contained nothing but debug information, and had way more than "one value" in them. This patch converts the code to use debugfs for these files instead. Compile tested only. Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
237 lines
5.5 KiB
C
237 lines
5.5 KiB
C
/*
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* Compaq Hot Plug Controller Driver
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*
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* Copyright (C) 1995,2001 Compaq Computer Corporation
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* Copyright (C) 2001,2003 Greg Kroah-Hartman (greg@kroah.com)
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* Copyright (C) 2001 IBM Corp.
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to <greg@kroah.com>
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*
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/proc_fs.h>
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#include <linux/workqueue.h>
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#include <linux/pci.h>
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#include <linux/debugfs.h>
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#include "cpqphp.h"
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static int show_ctrl (struct controller *ctrl, char *buf)
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{
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char *out = buf;
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int index;
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struct pci_resource *res;
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out += sprintf(buf, "Free resources: memory\n");
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index = 11;
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res = ctrl->mem_head;
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while (res && index--) {
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out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
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res = res->next;
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}
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out += sprintf(out, "Free resources: prefetchable memory\n");
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index = 11;
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res = ctrl->p_mem_head;
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while (res && index--) {
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out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
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res = res->next;
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}
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out += sprintf(out, "Free resources: IO\n");
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index = 11;
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res = ctrl->io_head;
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while (res && index--) {
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out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
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res = res->next;
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}
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out += sprintf(out, "Free resources: bus numbers\n");
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index = 11;
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res = ctrl->bus_head;
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while (res && index--) {
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out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
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res = res->next;
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}
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return out - buf;
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}
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static int show_dev (struct controller *ctrl, char *buf)
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{
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char * out = buf;
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int index;
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struct pci_resource *res;
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struct pci_func *new_slot;
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struct slot *slot;
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slot = ctrl->slot;
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while (slot) {
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new_slot = cpqhp_slot_find(slot->bus, slot->device, 0);
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if (!new_slot)
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break;
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out += sprintf(out, "assigned resources: memory\n");
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index = 11;
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res = new_slot->mem_head;
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while (res && index--) {
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out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
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res = res->next;
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}
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out += sprintf(out, "assigned resources: prefetchable memory\n");
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index = 11;
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res = new_slot->p_mem_head;
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while (res && index--) {
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out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
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res = res->next;
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}
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out += sprintf(out, "assigned resources: IO\n");
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index = 11;
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res = new_slot->io_head;
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while (res && index--) {
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out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
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res = res->next;
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}
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out += sprintf(out, "assigned resources: bus numbers\n");
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index = 11;
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res = new_slot->bus_head;
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while (res && index--) {
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out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
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res = res->next;
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}
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slot=slot->next;
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}
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return out - buf;
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}
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static int spew_debug_info(struct controller *ctrl, char *data, int size)
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{
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int used;
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used = size - show_ctrl(ctrl, data);
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used = (size - used) - show_dev(ctrl, &data[used]);
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return used;
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}
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struct ctrl_dbg {
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int size;
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char *data;
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struct controller *ctrl;
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};
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#define MAX_OUTPUT (4*PAGE_SIZE)
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static int open(struct inode *inode, struct file *file)
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{
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struct controller *ctrl = inode->u.generic_ip;
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struct ctrl_dbg *dbg;
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int retval = -ENOMEM;
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lock_kernel();
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dbg = kmalloc(sizeof(*dbg), GFP_KERNEL);
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if (!dbg)
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goto exit;
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dbg->data = kmalloc(MAX_OUTPUT, GFP_KERNEL);
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if (!dbg->data) {
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kfree(dbg);
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goto exit;
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}
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dbg->size = spew_debug_info(ctrl, dbg->data, MAX_OUTPUT);
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file->private_data = dbg;
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retval = 0;
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exit:
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unlock_kernel();
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return retval;
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}
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static loff_t lseek(struct file *file, loff_t off, int whence)
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{
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struct ctrl_dbg *dbg;
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loff_t new = -1;
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lock_kernel();
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dbg = file->private_data;
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switch (whence) {
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case 0:
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new = off;
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break;
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case 1:
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new = file->f_pos + off;
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break;
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}
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if (new < 0 || new > dbg->size) {
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unlock_kernel();
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return -EINVAL;
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}
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unlock_kernel();
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return (file->f_pos = new);
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}
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static ssize_t read(struct file *file, char __user *buf,
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size_t nbytes, loff_t *ppos)
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{
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struct ctrl_dbg *dbg = file->private_data;
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return simple_read_from_buffer(buf, nbytes, ppos, dbg->data, dbg->size);
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}
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static int release(struct inode *inode, struct file *file)
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{
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struct ctrl_dbg *dbg = file->private_data;
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kfree(dbg->data);
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kfree(dbg);
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return 0;
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}
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static struct file_operations debug_ops = {
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.owner = THIS_MODULE,
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.open = open,
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.llseek = lseek,
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.read = read,
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.release = release,
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};
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static struct dentry *root;
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void cpqhp_initialize_debugfs(void)
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{
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if (!root)
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root = debugfs_create_dir("cpqhp", NULL);
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}
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void cpqhp_shutdown_debugfs(void)
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{
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debugfs_remove(root);
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}
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void cpqhp_create_debugfs_files(struct controller *ctrl)
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{
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ctrl->dentry = debugfs_create_file(ctrl->pci_dev->dev.bus_id, S_IRUGO, root, ctrl, &debug_ops);
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}
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void cpqhp_remove_debugfs_files(struct controller *ctrl)
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{
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if (ctrl->dentry)
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debugfs_remove(ctrl->dentry);
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ctrl->dentry = NULL;
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}
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