arch/powerpc/platforms/pseries/hvCall_inst.c

   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
  30 DEFINE_PER_CPU(struct hcall_stats[HCALL_STAT_ARRAY_SIZE], hcall_stats);
  31
  32 /*
  33  * Routines for displaying the statistics in debugfs
  34  */
  35 static 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
  43 static void *hc_next(struct seq_file *m, void *p, loff_t * pos)
  44 {
  45         ++*pos;
  46
  47         return hc_start(m, pos);
  48 }
  49
  50 static void hc_stop(struct seq_file *m, void *p)
  51 {
  52 }
  53
  54 static 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
  74 static 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
  81 static 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
  93 static 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
 103 static 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);