LXR linux/arch/powerpc/platforms/pseries/hvCall

   1/*
   2 * Copyright (C) 2006 Mike Kravetz IBM Corporation
   3 *
   4 * Hypervisor Call Instrumentation
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; either version 2 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, write to the Free Software
  18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19 */
  20
  21#include <linux/kernel.h>
  22#include <linux/percpu.h>
  23#include <linux/debugfs.h>
  24#include <linux/seq_file.h>
  25#include <linux/cpumask.h>
  26#include <asm/hvcall.h>
  27#include <asm/firmware.h>
  28#include <asm/cputable.h>
  29
  30DEFINE_PER_CPU(struct hcall_stats[HCALL_STAT_ARRAY_SIZE], hcall_stats);
  31
  32/*
  33 * Routines for displaying the statistics in debugfs
  34 */
  35static void *hc_start(struct seq_file *m, loff_t *pos)
  36{
  37        if ((int)*pos < (HCALL_STAT_ARRAY_SIZE-1))
  38                return (void *)(unsigned long)(*pos + 1);
  39
  40        return NULL;
  41}
  42
  43static void *hc_next(struct seq_file *m, void *p, loff_t * pos)
  44{
  45        ++*pos;
  46
  47        return hc_start(m, pos);
  48}
  49
  50static void hc_stop(struct seq_file *m, void *p)
  51{
  52}
  53
  54static int hc_show(struct seq_file *m, void *p)
  55{
  56        unsigned long h_num = (unsigned long)p;
  57        struct hcall_stats *hs = (struct hcall_stats *)m->private;
  58
  59        if (hs[h_num].num_calls) {
  60                if (cpu_has_feature(CPU_FTR_PURR))
  61                        seq_printf(m, "%lu %lu %lu %lu\n", h_num<<2,
  62                                   hs[h_num].num_calls,
  63                                   hs[h_num].tb_total,
  64                                   hs[h_num].purr_total);
  65                else
  66                        seq_printf(m, "%lu %lu %lu\n", h_num<<2,
  67                                   hs[h_num].num_calls,
  68                                   hs[h_num].tb_total);
  69        }
  70
  71        return 0;
  72}
  73
  74static const struct seq_operations hcall_inst_seq_ops = {
  75        .start = hc_start,
  76        .next  = hc_next,
  77        .stop  = hc_stop,
  78        .show  = hc_show
  79};
  80
  81static int hcall_inst_seq_open(struct inode *inode, struct file *file)
  82{
  83        int rc;
  84        struct seq_file *seq;
  85
  86        rc = seq_open(file, &hcall_inst_seq_ops);
  87        seq = file->private_data;
  88        seq->private = file->f_path.dentry->d_inode->i_private;
  89
  90        return rc;
  91}
  92
  93static const struct file_operations hcall_inst_seq_fops = {
  94        .open = hcall_inst_seq_open,
  95        .read = seq_read,
  96        .llseek = seq_lseek,
  97        .release = seq_release,
  98};
  99
 100#define HCALL_ROOT_DIR          "hcall_inst"
 101#define CPU_NAME_BUF_SIZE       32
 102
 103static int __init hcall_inst_init(void)
 104{
 105        struct dentry *hcall_root;
 106        struct dentry *hcall_file;
 107        char cpu_name_buf[CPU_NAME_BUF_SIZE];
 108        int cpu;
 109
 110        if (!firmware_has_feature(FW_FEATURE_LPAR))
 111                return 0;
 112
 113        hcall_root = debugfs_create_dir(HCALL_ROOT_DIR, NULL);
 114        if (!hcall_root)
 115                return -ENOMEM;
 116
 117        for_each_possible_cpu(cpu) {
 118                snprintf(cpu_name_buf, CPU_NAME_BUF_SIZE, "cpu%d", cpu);
 119                hcall_file = debugfs_create_file(cpu_name_buf, S_IRUGO,
 120                                                 hcall_root,
 121                                                 per_cpu(hcall_stats, cpu),
 122                                                 &hcall_inst_seq_fops);
 123                if (!hcall_file)
 124                        return -ENOMEM;
 125        }
 126
 127        return 0;
 128}
 129__initcall(hcall_inst_init);
 130