cpqphp_sysfs.c

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/*
 * Compaq Hot Plug Controller Driver
 *
 * Copyright (C) 1995,2001 Compaq Computer Corporation
 * Copyright (C) 2001,2003 Greg Kroah-Hartman ([email protected])
 * Copyright (C) 2001 IBM Corp.
 *
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Send feedback to <[email protected]>
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/workqueue.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/mutex.h>
#include <linux/debugfs.h>
#include "cpqphp.h"

static DEFINE_MUTEX(cpqphp_mutex);
static int show_ctrl (struct controller *ctrl, char *buf)
{
    char *out = buf;
    int index;
    struct pci_resource *res;

    out += sprintf(buf, "Free resources: memory\n");
    index = 11;
    res = ctrl->mem_head;
    while (res && index--) {
        out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
        res = res->next;
    }
    out += sprintf(out, "Free resources: prefetchable memory\n");
    index = 11;
    res = ctrl->p_mem_head;
    while (res && index--) {
        out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
        res = res->next;
    }
    out += sprintf(out, "Free resources: IO\n");
    index = 11;
    res = ctrl->io_head;
    while (res && index--) {
        out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
        res = res->next;
    }
    out += sprintf(out, "Free resources: bus numbers\n");
    index = 11;
    res = ctrl->bus_head;
    while (res && index--) {
        out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
        res = res->next;
    }

    return out - buf;
}

static int show_dev (struct controller *ctrl, char *buf)
{
    char * out = buf;
    int index;
    struct pci_resource *res;
    struct pci_func *new_slot;
    struct slot *slot;

    slot = ctrl->slot;

    while (slot) {
        new_slot = cpqhp_slot_find(slot->bus, slot->device, 0);
        if (!new_slot)
            break;
        out += sprintf(out, "assigned resources: memory\n");
        index = 11;
        res = new_slot->mem_head;
        while (res && index--) {
            out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
            res = res->next;
        }
        out += sprintf(out, "assigned resources: prefetchable memory\n");
        index = 11;
        res = new_slot->p_mem_head;
        while (res && index--) {
            out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
            res = res->next;
        }
        out += sprintf(out, "assigned resources: IO\n");
        index = 11;
        res = new_slot->io_head;
        while (res && index--) {
            out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
            res = res->next;
        }
        out += sprintf(out, "assigned resources: bus numbers\n");
        index = 11;
        res = new_slot->bus_head;
        while (res && index--) {
            out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length);
            res = res->next;
        }
        slot=slot->next;
    }

    return out - buf;
}

static int spew_debug_info(struct controller *ctrl, char *data, int size)
{
    int used;

    used = size - show_ctrl(ctrl, data);
    used = (size - used) - show_dev(ctrl, &data[used]);
    return used;
}

struct ctrl_dbg {
    int size;
    char *data;
    struct controller *ctrl;
};

#define MAX_OUTPUT  (4*PAGE_SIZE)

static int open(struct inode *inode, struct file *file)
{
    struct controller *ctrl = inode->i_private;
    struct ctrl_dbg *dbg;
    int retval = -ENOMEM;

    mutex_lock(&cpqphp_mutex);
    dbg = kmalloc(sizeof(*dbg), GFP_KERNEL);
    if (!dbg)
        goto exit;
    dbg->data = kmalloc(MAX_OUTPUT, GFP_KERNEL);
    if (!dbg->data) {
        kfree(dbg);
        goto exit;
    }
    dbg->size = spew_debug_info(ctrl, dbg->data, MAX_OUTPUT);
    file->private_data = dbg;
    retval = 0;
exit:
    mutex_unlock(&cpqphp_mutex);
    return retval;
}

static loff_t lseek(struct file *file, loff_t off, int whence)
{
    struct ctrl_dbg *dbg;
    loff_t new = -1;

    mutex_lock(&cpqphp_mutex);
    dbg = file->private_data;

    switch (whence) {
    case 0:
        new = off;
        break;
    case 1:
        new = file->f_pos + off;
        break;
    }
    if (new < 0 || new > dbg->size) {
        mutex_unlock(&cpqphp_mutex);
        return -EINVAL;
    }
    mutex_unlock(&cpqphp_mutex);
    return (file->f_pos = new);
}

static ssize_t read(struct file *file, char __user *buf,
            size_t nbytes, loff_t *ppos)
{
    struct ctrl_dbg *dbg = file->private_data;
    return simple_read_from_buffer(buf, nbytes, ppos, dbg->data, dbg->size);
}

static int release(struct inode *inode, struct file *file)
{
    struct ctrl_dbg *dbg = file->private_data;

    kfree(dbg->data);
    kfree(dbg);
    return 0;
}

static const struct file_operations debug_ops = {
    .owner = THIS_MODULE,
    .open = open,
    .llseek = lseek,
    .read = read,
    .release = release,
};

static struct dentry *root;

void cpqhp_initialize_debugfs(void)
{
    if (!root)
        root = debugfs_create_dir("cpqhp", NULL);
}

void cpqhp_shutdown_debugfs(void)
{
    debugfs_remove(root);
}

void cpqhp_create_debugfs_files(struct controller *ctrl)
{
    ctrl->dentry = debugfs_create_file(dev_name(&ctrl->pci_dev->dev),
                       S_IRUGO, root, ctrl, &debug_ops);
}

void cpqhp_remove_debugfs_files(struct controller *ctrl)
{
    if (ctrl->dentry)
        debugfs_remove(ctrl->dentry);
    ctrl->dentry = NULL;
}