gruprocfs.c

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/*
 * SN Platform GRU Driver
 *
 *              PROC INTERFACES
 *
 * This file supports the /proc interfaces for the GRU driver
 *
 *  Copyright (c) 2008 Silicon Graphics, Inc.  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.  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/proc_fs.h>
#include <linux/device.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include "gru.h"
#include "grulib.h"
#include "grutables.h"

#define printstat(s, f)     printstat_val(s, &gru_stats.f, #f)

static void printstat_val(struct seq_file *s, atomic_long_t *v, char *id)
{
    unsigned long val = atomic_long_read(v);

    seq_printf(s, "%16lu %s\n", val, id);
}

static int statistics_show(struct seq_file *s, void *p)
{
    printstat(s, vdata_alloc);
    printstat(s, vdata_free);
    printstat(s, gts_alloc);
    printstat(s, gts_free);
    printstat(s, gms_alloc);
    printstat(s, gms_free);
    printstat(s, gts_double_allocate);
    printstat(s, assign_context);
    printstat(s, assign_context_failed);
    printstat(s, free_context);
    printstat(s, load_user_context);
    printstat(s, load_kernel_context);
    printstat(s, lock_kernel_context);
    printstat(s, unlock_kernel_context);
    printstat(s, steal_user_context);
    printstat(s, steal_kernel_context);
    printstat(s, steal_context_failed);
    printstat(s, nopfn);
    printstat(s, asid_new);
    printstat(s, asid_next);
    printstat(s, asid_wrap);
    printstat(s, asid_reuse);
    printstat(s, intr);
    printstat(s, intr_cbr);
    printstat(s, intr_tfh);
    printstat(s, intr_spurious);
    printstat(s, intr_mm_lock_failed);
    printstat(s, call_os);
    printstat(s, call_os_wait_queue);
    printstat(s, user_flush_tlb);
    printstat(s, user_unload_context);
    printstat(s, user_exception);
    printstat(s, set_context_option);
    printstat(s, check_context_retarget_intr);
    printstat(s, check_context_unload);
    printstat(s, tlb_dropin);
    printstat(s, tlb_preload_page);
    printstat(s, tlb_dropin_fail_no_asid);
    printstat(s, tlb_dropin_fail_upm);
    printstat(s, tlb_dropin_fail_invalid);
    printstat(s, tlb_dropin_fail_range_active);
    printstat(s, tlb_dropin_fail_idle);
    printstat(s, tlb_dropin_fail_fmm);
    printstat(s, tlb_dropin_fail_no_exception);
    printstat(s, tfh_stale_on_fault);
    printstat(s, mmu_invalidate_range);
    printstat(s, mmu_invalidate_page);
    printstat(s, flush_tlb);
    printstat(s, flush_tlb_gru);
    printstat(s, flush_tlb_gru_tgh);
    printstat(s, flush_tlb_gru_zero_asid);
    printstat(s, copy_gpa);
    printstat(s, read_gpa);
    printstat(s, mesq_receive);
    printstat(s, mesq_receive_none);
    printstat(s, mesq_send);
    printstat(s, mesq_send_failed);
    printstat(s, mesq_noop);
    printstat(s, mesq_send_unexpected_error);
    printstat(s, mesq_send_lb_overflow);
    printstat(s, mesq_send_qlimit_reached);
    printstat(s, mesq_send_amo_nacked);
    printstat(s, mesq_send_put_nacked);
    printstat(s, mesq_qf_locked);
    printstat(s, mesq_qf_noop_not_full);
    printstat(s, mesq_qf_switch_head_failed);
    printstat(s, mesq_qf_unexpected_error);
    printstat(s, mesq_noop_unexpected_error);
    printstat(s, mesq_noop_lb_overflow);
    printstat(s, mesq_noop_qlimit_reached);
    printstat(s, mesq_noop_amo_nacked);
    printstat(s, mesq_noop_put_nacked);
    printstat(s, mesq_noop_page_overflow);
    return 0;
}

static ssize_t statistics_write(struct file *file, const char __user *userbuf,
                size_t count, loff_t *data)
{
    memset(&gru_stats, 0, sizeof(gru_stats));
    return count;
}

static int mcs_statistics_show(struct seq_file *s, void *p)
{
    int op;
    unsigned long total, count, max;
    static char *id[] = {"cch_allocate", "cch_start", "cch_interrupt",
        "cch_interrupt_sync", "cch_deallocate", "tfh_write_only",
        "tfh_write_restart", "tgh_invalidate"};

    seq_printf(s, "%-20s%12s%12s%12s\n", "#id", "count", "aver-clks", "max-clks");
    for (op = 0; op < mcsop_last; op++) {
        count = atomic_long_read(&mcs_op_statistics[op].count);
        total = atomic_long_read(&mcs_op_statistics[op].total);
        max = mcs_op_statistics[op].max;
        seq_printf(s, "%-20s%12ld%12ld%12ld\n", id[op], count,
               count ? total / count : 0, max);
    }
    return 0;
}

static ssize_t mcs_statistics_write(struct file *file,
            const char __user *userbuf, size_t count, loff_t *data)
{
    memset(mcs_op_statistics, 0, sizeof(mcs_op_statistics));
    return count;
}

static int options_show(struct seq_file *s, void *p)
{
    seq_printf(s, "#bitmask: 1=trace, 2=statistics\n");
    seq_printf(s, "0x%lx\n", gru_options);
    return 0;
}

static ssize_t options_write(struct file *file, const char __user *userbuf,
                 size_t count, loff_t *data)
{
    char buf[20];

    if (count >= sizeof(buf))
        return -EINVAL;
    if (copy_from_user(buf, userbuf, count))
        return -EFAULT;
    buf[count] = '\0';
    if (strict_strtoul(buf, 0, &gru_options))
        return -EINVAL;

    return count;
}

static int cch_seq_show(struct seq_file *file, void *data)
{
    long gid = *(long *)data;
    int i;
    struct gru_state *gru = GID_TO_GRU(gid);
    struct gru_thread_state *ts;
    const char *mode[] = { "??", "UPM", "INTR", "OS_POLL" };

    if (gid == 0)
        seq_printf(file, "#%5s%5s%6s%7s%9s%6s%8s%8s\n", "gid", "bid",
               "ctx#", "asid", "pid", "cbrs", "dsbytes", "mode");
    if (gru)
        for (i = 0; i < GRU_NUM_CCH; i++) {
            ts = gru->gs_gts[i];
            if (!ts)
                continue;
            seq_printf(file, " %5d%5d%6d%7d%9d%6d%8d%8s\n",
                   gru->gs_gid, gru->gs_blade_id, i,
                   is_kernel_context(ts) ? 0 : ts->ts_gms->ms_asids[gid].mt_asid,
                   is_kernel_context(ts) ? 0 : ts->ts_tgid_owner,
                   ts->ts_cbr_au_count * GRU_CBR_AU_SIZE,
                   ts->ts_cbr_au_count * GRU_DSR_AU_BYTES,
                   mode[ts->ts_user_options &
                    GRU_OPT_MISS_MASK]);
        }

    return 0;
}

static int gru_seq_show(struct seq_file *file, void *data)
{
    long gid = *(long *)data, ctxfree, cbrfree, dsrfree;
    struct gru_state *gru = GID_TO_GRU(gid);

    if (gid == 0) {
        seq_printf(file, "#%5s%5s%7s%6s%6s%8s%6s%6s\n", "gid", "nid",
               "ctx", "cbr", "dsr", "ctx", "cbr", "dsr");
        seq_printf(file, "#%5s%5s%7s%6s%6s%8s%6s%6s\n", "", "", "busy",
               "busy", "busy", "free", "free", "free");
    }
    if (gru) {
        ctxfree = GRU_NUM_CCH - gru->gs_active_contexts;
        cbrfree = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
        dsrfree = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES;
        seq_printf(file, " %5d%5d%7ld%6ld%6ld%8ld%6ld%6ld\n",
               gru->gs_gid, gru->gs_blade_id, GRU_NUM_CCH - ctxfree,
               GRU_NUM_CBE - cbrfree, GRU_NUM_DSR_BYTES - dsrfree,
               ctxfree, cbrfree, dsrfree);
    }

    return 0;
}

static void seq_stop(struct seq_file *file, void *data)
{
}

static void *seq_start(struct seq_file *file, loff_t *gid)
{
    if (*gid < gru_max_gids)
        return gid;
    return NULL;
}

static void *seq_next(struct seq_file *file, void *data, loff_t *gid)
{
    (*gid)++;
    if (*gid < gru_max_gids)
        return gid;
    return NULL;
}

static const struct seq_operations cch_seq_ops = {
    .start  = seq_start,
    .next   = seq_next,
    .stop   = seq_stop,
    .show   = cch_seq_show
};

static const struct seq_operations gru_seq_ops = {
    .start  = seq_start,
    .next   = seq_next,
    .stop   = seq_stop,
    .show   = gru_seq_show
};

static int statistics_open(struct inode *inode, struct file *file)
{
    return single_open(file, statistics_show, NULL);
}

static int mcs_statistics_open(struct inode *inode, struct file *file)
{
    return single_open(file, mcs_statistics_show, NULL);
}

static int options_open(struct inode *inode, struct file *file)
{
    return single_open(file, options_show, NULL);
}

static int cch_open(struct inode *inode, struct file *file)
{
    return seq_open(file, &cch_seq_ops);
}

static int gru_open(struct inode *inode, struct file *file)
{
    return seq_open(file, &gru_seq_ops);
}

/* *INDENT-OFF* */
static const struct file_operations statistics_fops = {
    .open       = statistics_open,
    .read       = seq_read,
    .write      = statistics_write,
    .llseek     = seq_lseek,
    .release    = single_release,
};

static const struct file_operations mcs_statistics_fops = {
    .open       = mcs_statistics_open,
    .read       = seq_read,
    .write      = mcs_statistics_write,
    .llseek     = seq_lseek,
    .release    = single_release,
};

static const struct file_operations options_fops = {
    .open       = options_open,
    .read       = seq_read,
    .write      = options_write,
    .llseek     = seq_lseek,
    .release    = single_release,
};

static const struct file_operations cch_fops = {
    .open       = cch_open,
    .read       = seq_read,
    .llseek     = seq_lseek,
    .release    = seq_release,
};
static const struct file_operations gru_fops = {
    .open       = gru_open,
    .read       = seq_read,
    .llseek     = seq_lseek,
    .release    = seq_release,
};

static struct proc_entry {
    char *name;
    umode_t mode;
    const struct file_operations *fops;
    struct proc_dir_entry *entry;
} proc_files[] = {
    {"statistics", 0644, &statistics_fops},
    {"mcs_statistics", 0644, &mcs_statistics_fops},
    {"debug_options", 0644, &options_fops},
    {"cch_status", 0444, &cch_fops},
    {"gru_status", 0444, &gru_fops},
    {NULL}
};
/* *INDENT-ON* */

static struct proc_dir_entry *proc_gru __read_mostly;

static int create_proc_file(struct proc_entry *p)
{
    p->entry = proc_create(p->name, p->mode, proc_gru, p->fops);
    if (!p->entry)
        return -1;
    return 0;
}

static void delete_proc_files(void)
{
    struct proc_entry *p;

    if (proc_gru) {
        for (p = proc_files; p->name; p++)
            if (p->entry)
                remove_proc_entry(p->name, proc_gru);
        remove_proc_entry("gru", proc_gru->parent);
    }
}

int gru_proc_init(void)
{
    struct proc_entry *p;

    proc_gru = proc_mkdir("sgi_uv/gru", NULL);

    for (p = proc_files; p->name; p++)
        if (create_proc_file(p))
            goto err;
    return 0;

err:
    delete_proc_files();
    return -1;
}

void gru_proc_exit(void)
{
    delete_proc_files();
}