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#include <asm/trace.h>
  30
  31DEFINE_PER_CPU(struct hcall_stats[HCALL_STAT_ARRAY_SIZE], hcall_stats);
  32
  33/*
  34 * Routines for displaying the statistics in debugfs
  35 */
  36static void *hc_start(struct seq_file *m, loff_t *pos)
  37{
  38        if ((int)*pos < (HCALL_STAT_ARRAY_SIZE-1))
  39                return (void *)(unsigned long)(*pos + 1);
  40
  41        return NULL;
  42}
  43
  44static void *hc_next(struct seq_file *m, void *p, loff_t * pos)
  45{
  46        ++*pos;
  47
  48        return hc_start(m, pos);
  49}
  50
  51static void hc_stop(struct seq_file *m, void *p)
  52{
  53}
  54
  55static int hc_show(struct seq_file *m, void *p)
  56{
  57        unsigned long h_num = (unsigned long)p;
  58        struct hcall_stats *hs = m->private;
  59
  60        if (hs[h_num].num_calls) {
  61                if (cpu_has_feature(CPU_FTR_PURR))
  62                        seq_printf(m, "%lu %lu %lu %lu\n", h_num<<2,
  63                                   hs[h_num].num_calls,
  64                                   hs[h_num].tb_total,
  65                                   hs[h_num].purr_total);
  66                else
  67                        seq_printf(m, "%lu %lu %lu\n", h_num<<2,
  68                                   hs[h_num].num_calls,
  69                                   hs[h_num].tb_total);
  70        }
  71
  72        return 0;
  73}
  74
  75static const struct seq_operations hcall_inst_seq_ops = {
  76        .start = hc_start,
  77        .next  = hc_next,
  78        .stop  = hc_stop,
  79        .show  = hc_show
  80};
  81
  82static int hcall_inst_seq_open(struct inode *inode, struct file *file)
  83{
  84        int rc;
  85        struct seq_file *seq;
  86
  87        rc = seq_open(file, &hcall_inst_seq_ops);
  88        seq = file->private_data;
  89        seq->private = file->f_path.dentry->d_inode->i_private;
  90
  91        return rc;
  92}
  93
  94static const struct file_operations hcall_inst_seq_fops = {
  95        .open = hcall_inst_seq_open,
  96        .read = seq_read,
  97        .llseek = seq_lseek,
  98        .release = seq_release,
  99};
 100
 101#define HCALL_ROOT_DIR          "hcall_inst"
 102#define CPU_NAME_BUF_SIZE       32
 103
 104
 105static void probe_hcall_entry(void *ignored, unsigned long opcode, unsigned long *args)
 106{
 107        struct hcall_stats *h;
 108
 109        if (opcode > MAX_HCALL_OPCODE)
 110                return;
 111
 112        h = &__get_cpu_var(hcall_stats)[opcode / 4];
 113        h->tb_start = mftb();
 114        h->purr_start = mfspr(SPRN_PURR);
 115}
 116
 117static void probe_hcall_exit(void *ignored, unsigned long opcode, unsigned long retval,
 118                             unsigned long *retbuf)
 119{
 120        struct hcall_stats *h;
 121
 122        if (opcode > MAX_HCALL_OPCODE)
 123                return;
 124
 125        h = &__get_cpu_var(hcall_stats)[opcode / 4];
 126        h->num_calls++;
 127        h->tb_total += mftb() - h->tb_start;
 128        h->purr_total += mfspr(SPRN_PURR) - h->purr_start;
 129}
 130
 131static int __init hcall_inst_init(void)
 132{
 133        struct dentry *hcall_root;
 134        struct dentry *hcall_file;
 135        char cpu_name_buf[CPU_NAME_BUF_SIZE];
 136        int cpu;
 137
 138        if (!firmware_has_feature(FW_FEATURE_LPAR))
 139                return 0;
 140
 141        if (register_trace_hcall_entry(probe_hcall_entry, NULL))
 142                return -EINVAL;
 143
 144        if (register_trace_hcall_exit(probe_hcall_exit, NULL)) {
 145                unregister_trace_hcall_entry(probe_hcall_entry, NULL);
 146                return -EINVAL;
 147        }
 148
 149        hcall_root = debugfs_create_dir(HCALL_ROOT_DIR, NULL);
 150        if (!hcall_root)
 151                return -ENOMEM;
 152
 153        for_each_possible_cpu(cpu) {
 154                snprintf(cpu_name_buf, CPU_NAME_BUF_SIZE, "cpu%d", cpu);
 155                hcall_file = debugfs_create_file(cpu_name_buf, S_IRUGO,
 156                                                 hcall_root,
 157                                                 per_cpu(hcall_stats, cpu),
 158                                                 &hcall_inst_seq_fops);
 159                if (!hcall_file)
 160                        return -ENOMEM;
 161        }
 162
 163        return 0;
 164}
 165__initcall(hcall_inst_init);
 166