proc.c

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/*
 * Copyright 2010 Tilera Corporation. 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, version 2.
 *
 *   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.
 */

#include <linux/smp.h>
#include <linux/seq_file.h>
#include <linux/threads.h>
#include <linux/cpumask.h>
#include <linux/timex.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/proc_fs.h>
#include <linux/sysctl.h>
#include <linux/hardirq.h>
#include <linux/hugetlb.h>
#include <linux/mman.h>
#include <asm/unaligned.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/sections.h>
#include <asm/homecache.h>
#include <asm/hardwall.h>
#include <arch/chip.h>


/*
 * Support /proc/cpuinfo
 */

#define cpu_to_ptr(n) ((void *)((long)(n)+1))
#define ptr_to_cpu(p) ((long)(p) - 1)

static int show_cpuinfo(struct seq_file *m, void *v)
{
    int n = ptr_to_cpu(v);

    if (n == 0) {
        char buf[NR_CPUS*5];
        cpulist_scnprintf(buf, sizeof(buf), cpu_online_mask);
        seq_printf(m, "cpu count\t: %d\n", num_online_cpus());
        seq_printf(m, "cpu list\t: %s\n", buf);
        seq_printf(m, "model name\t: %s\n", chip_model);
        seq_printf(m, "flags\t\t:\n");  /* nothing for now */
        seq_printf(m, "cpu MHz\t\t: %llu.%06llu\n",
               get_clock_rate() / 1000000,
               (get_clock_rate() % 1000000));
        seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
               loops_per_jiffy/(500000/HZ),
               (loops_per_jiffy/(5000/HZ)) % 100);
    }

#ifdef CONFIG_SMP
    if (!cpu_online(n))
        return 0;
#endif

    seq_printf(m, "processor\t: %d\n", n);

    /* Print only num_online_cpus() blank lines total. */
    if (cpumask_next(n, cpu_online_mask) < nr_cpu_ids)
        seq_printf(m, "\n");

    return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
    return *pos < nr_cpu_ids ? cpu_to_ptr(*pos) : NULL;
}
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
    ++*pos;
    return c_start(m, pos);
}
static void c_stop(struct seq_file *m, void *v)
{
}
const struct seq_operations cpuinfo_op = {
    .start  = c_start,
    .next   = c_next,
    .stop   = c_stop,
    .show   = show_cpuinfo,
};

/*
 * Support /proc/tile directory
 */

static int __init proc_tile_init(void)
{
    struct proc_dir_entry *root = proc_mkdir("tile", NULL);
    if (root == NULL)
        return 0;

    proc_tile_hardwall_init(root);

    return 0;
}

arch_initcall(proc_tile_init);

/*
 * Support /proc/sys/tile directory
 */

#ifndef __tilegx__  /* FIXME: GX: no support for unaligned access yet */
static ctl_table unaligned_subtable[] = {
    {
        .procname   = "enabled",
        .data       = &unaligned_fixup,
        .maxlen     = sizeof(int),
        .mode       = 0644,
        .proc_handler   = &proc_dointvec
    },
    {
        .procname   = "printk",
        .data       = &unaligned_printk,
        .maxlen     = sizeof(int),
        .mode       = 0644,
        .proc_handler   = &proc_dointvec
    },
    {
        .procname   = "count",
        .data       = &unaligned_fixup_count,
        .maxlen     = sizeof(int),
        .mode       = 0644,
        .proc_handler   = &proc_dointvec
    },
    {}
};

static ctl_table unaligned_table[] = {
    {
        .procname   = "unaligned_fixup",
        .mode       = 0555,
        .child      = unaligned_subtable
    },
    {}
};

static struct ctl_path tile_path[] = {
    { .procname = "tile" },
    { }
};

static int __init proc_sys_tile_init(void)
{
    register_sysctl_paths(tile_path, unaligned_table);
    return 0;
}

arch_initcall(proc_sys_tile_init);
#endif