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
  32/* For hcall instrumentation. One structure per-hcall, per-CPU */
  33struct hcall_stats {
  34        unsigned long   num_calls;      /* number of calls (on this CPU) */
  35        unsigned long   tb_total;       /* total wall time (mftb) of calls. */
  36        unsigned long   purr_total;     /* total cpu time (PURR) of calls. */
  37        unsigned long   tb_start;
  38        unsigned long   purr_start;
  39};
  40#define HCALL_STAT_ARRAY_SIZE   ((MAX_HCALL_OPCODE >> 2) + 1)
  41
  42DEFINE_PER_CPU(struct hcall_stats[HCALL_STAT_ARRAY_SIZE], hcall_stats);
  43
  44/*
  45 * Routines for displaying the statistics in debugfs
  46 */
  47static void *hc_start(struct seq_file *m, loff_t *pos)
  48{
  49        if ((int)*pos < (HCALL_STAT_ARRAY_SIZE-1))
  50                return (void *)(unsigned long)(*pos + 1);
  51
  52        return NULL;
  53}
  54
  55static void *hc_next(struct seq_file *m, void *p, loff_t * pos)
  56{
  57        ++*pos;
  58
  59        return hc_start(m, pos);
  60}
  61
  62static void hc_stop(struct seq_file *m, void *p)
  63{
  64}
  65
  66static int hc_show(struct seq_file *m, void *p)
  67{
  68        unsigned long h_num = (unsigned long)p;
  69        struct hcall_stats *hs = m->private;
  70
  71        if (hs[h_num].num_calls) {
  72                if (cpu_has_feature(CPU_FTR_PURR))
  73                        seq_printf(m, "%lu %lu %lu %lu\n", h_num<<2,
  74                                   hs[h_num].num_calls,
  75                                   hs[h_num].tb_total,
  76                                   hs[h_num].purr_total);
  77                else
  78                        seq_printf(m, "%lu %lu %lu\n", h_num<<2,
  79                                   hs[h_num].num_calls,
  80                                   hs[h_num].tb_total);
  81        }
  82
  83        return 0;
  84}
  85
  86static const struct seq_operations hcall_inst_seq_ops = {
  87        .start = hc_start,
  88        .next  = hc_next,
  89        .stop  = hc_stop,
  90        .show  = hc_show
  91};
  92
  93static int hcall_inst_seq_open(struct inode *inode, struct file *file)
  94{
  95        int rc;
  96        struct seq_file *seq;
  97
  98        rc = seq_open(file, &hcall_inst_seq_ops);
  99        seq = file->private_data;
 100        seq->private = file_inode(file)->i_private;
 101
 102        return rc;
 103}
 104
 105static const struct file_operations hcall_inst_seq_fops = {
 106        .open = hcall_inst_seq_open,
 107        .read = seq_read,
 108        .llseek = seq_lseek,
 109        .release = seq_release,
 110};
 111
 112#define HCALL_ROOT_DIR          "hcall_inst"
 113#define CPU_NAME_BUF_SIZE       32
 114
 115
 116static void probe_hcall_entry(void *ignored, unsigned long opcode, unsigned long *args)
 117{
 118        struct hcall_stats *h;
 119
 120        if (opcode > MAX_HCALL_OPCODE)
 121                return;
 122
 123        h = this_cpu_ptr(&hcall_stats[opcode / 4]);
 124        h->tb_start = mftb();
 125        h->purr_start = mfspr(SPRN_PURR);
 126}
 127
 128static void probe_hcall_exit(void *ignored, unsigned long opcode, unsigned long retval,
 129                             unsigned long *retbuf)
 130{
 131        struct hcall_stats *h;
 132
 133        if (opcode > MAX_HCALL_OPCODE)
 134                return;
 135
 136        h = this_cpu_ptr(&hcall_stats[opcode / 4]);
 137        h->num_calls++;
 138        h->tb_total += mftb() - h->tb_start;
 139        h->purr_total += mfspr(SPRN_PURR) - h->purr_start;
 140}
 141
 142static int __init hcall_inst_init(void)
 143{
 144        struct dentry *hcall_root;
 145        struct dentry *hcall_file;
 146        char cpu_name_buf[CPU_NAME_BUF_SIZE];
 147        int cpu;
 148
 149        if (!firmware_has_feature(FW_FEATURE_LPAR))
 150                return 0;
 151
 152        if (register_trace_hcall_entry(probe_hcall_entry, NULL))
 153                return -EINVAL;
 154
 155        if (register_trace_hcall_exit(probe_hcall_exit, NULL)) {
 156                unregister_trace_hcall_entry(probe_hcall_entry, NULL);
 157                return -EINVAL;
 158        }
 159
 160        hcall_root = debugfs_create_dir(HCALL_ROOT_DIR, NULL);
 161        if (!hcall_root)
 162                return -ENOMEM;
 163
 164        for_each_possible_cpu(cpu) {
 165                snprintf(cpu_name_buf, CPU_NAME_BUF_SIZE, "cpu%d", cpu);
 166                hcall_file = debugfs_create_file(cpu_name_buf, 0444,
 167                                                 hcall_root,
 168                                                 per_cpu(hcall_stats, cpu),
 169                                                 &hcall_inst_seq_fops);
 170                if (!hcall_file)
 171                        return -ENOMEM;
 172        }
 173
 174        return 0;
 175}
 176machine_device_initcall(pseries, hcall_inst_init);
 177