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#include <asm/machdep.h>
  31
  32DEFINE_PER_CPU(struct hcall_stats[HCALL_STAT_ARRAY_SIZE], hcall_stats);
  33
  34/*
  35 * Routines for displaying the statistics in debugfs
  36 */
  37static void *hc_start(struct seq_file *m, loff_t *pos)
  38{
  39        if ((int)*pos < (HCALL_STAT_ARRAY_SIZE-1))
  40                return (void *)(unsigned long)(*pos + 1);
  41
  42        return NULL;
  43}
  44
  45static void *hc_next(struct seq_file *m, void *p, loff_t * pos)
  46{
  47        ++*pos;
  48
  49        return hc_start(m, pos);
  50}
  51
  52static void hc_stop(struct seq_file *m, void *p)
  53{
  54}
  55
  56static int hc_show(struct seq_file *m, void *p)
  57{
  58        unsigned long h_num = (unsigned long)p;
  59        struct hcall_stats *hs = m->private;
  60
  61        if (hs[h_num].num_calls) {
  62                if (cpu_has_feature(CPU_FTR_PURR))
  63                        seq_printf(m, "%lu %lu %lu %lu\n", h_num<<2,
  64                                   hs[h_num].num_calls,
  65                                   hs[h_num].tb_total,
  66                                   hs[h_num].purr_total);
  67                else
  68                        seq_printf(m, "%lu %lu %lu\n", h_num<<2,
  69                                   hs[h_num].num_calls,
  70                                   hs[h_num].tb_total);
  71        }
  72
  73        return 0;
  74}
  75
  76static const struct seq_operations hcall_inst_seq_ops = {
  77        .start = hc_start,
  78        .next  = hc_next,
  79        .stop  = hc_stop,
  80        .show  = hc_show
  81};
  82
  83static int hcall_inst_seq_open(struct inode *inode, struct file *file)
  84{
  85        int rc;
  86        struct seq_file *seq;
  87
  88        rc = seq_open(file, &hcall_inst_seq_ops);
  89        seq = file->private_data;
  90        seq->private = file_inode(file)->i_private;
  91
  92        return rc;
  93}
  94
  95static const struct file_operations hcall_inst_seq_fops = {
  96        .open = hcall_inst_seq_open,
  97        .read = seq_read,
  98        .llseek = seq_lseek,
  99        .release = seq_release,
 100};
 101
 102#define HCALL_ROOT_DIR          "hcall_inst"
 103#define CPU_NAME_BUF_SIZE       32
 104
 105
 106static void probe_hcall_entry(void *ignored, unsigned long opcode, unsigned long *args)
 107{
 108        struct hcall_stats *h;
 109
 110        if (opcode > MAX_HCALL_OPCODE)
 111                return;
 112
 113        h = this_cpu_ptr(&hcall_stats[opcode / 4]);
 114        h->tb_start = mftb();
 115        h->purr_start = mfspr(SPRN_PURR);
 116}
 117
 118static void probe_hcall_exit(void *ignored, unsigned long opcode, unsigned long retval,
 119                             unsigned long *retbuf)
 120{
 121        struct hcall_stats *h;
 122
 123        if (opcode > MAX_HCALL_OPCODE)
 124                return;
 125
 126        h = this_cpu_ptr(&hcall_stats[opcode / 4]);
 127        h->num_calls++;
 128        h->tb_total += mftb() - h->tb_start;
 129        h->purr_total += mfspr(SPRN_PURR) - h->purr_start;
 130}
 131
 132static int __init hcall_inst_init(void)
 133{
 134        struct dentry *hcall_root;
 135        struct dentry *hcall_file;
 136        char cpu_name_buf[CPU_NAME_BUF_SIZE];
 137        int cpu;
 138
 139        if (!firmware_has_feature(FW_FEATURE_LPAR))
 140                return 0;
 141
 142        if (register_trace_hcall_entry(probe_hcall_entry, NULL))
 143                return -EINVAL;
 144
 145        if (register_trace_hcall_exit(probe_hcall_exit, NULL)) {
 146                unregister_trace_hcall_entry(probe_hcall_entry, NULL);
 147                return -EINVAL;
 148        }
 149
 150        hcall_root = debugfs_create_dir(HCALL_ROOT_DIR, NULL);
 151        if (!hcall_root)
 152                return -ENOMEM;
 153
 154        for_each_possible_cpu(cpu) {
 155                snprintf(cpu_name_buf, CPU_NAME_BUF_SIZE, "cpu%d", cpu);
 156                hcall_file = debugfs_create_file(cpu_name_buf, S_IRUGO,
 157                                                 hcall_root,
 158                                                 per_cpu(hcall_stats, cpu),
 159                                                 &hcall_inst_seq_fops);
 160                if (!hcall_file)
 161                        return -ENOMEM;
 162        }
 163
 164        return 0;
 165}
 166machine_device_initcall(pseries, hcall_inst_init);
 167