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Linux/arch/powerpc/platforms/pseries/hvCall_inst.c

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  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 DEFINE_PER_CPU(struct hcall_stats[HCALL_STAT_ARRAY_SIZE], hcall_stats);
 33 
 34 /*
 35  * Routines for displaying the statistics in debugfs
 36  */
 37 static 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 
 45 static void *hc_next(struct seq_file *m, void *p, loff_t * pos)
 46 {
 47         ++*pos;
 48 
 49         return hc_start(m, pos);
 50 }
 51 
 52 static void hc_stop(struct seq_file *m, void *p)
 53 {
 54 }
 55 
 56 static 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 
 76 static 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 
 83 static 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 
 95 static 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 
106 static 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 = &__get_cpu_var(hcall_stats)[opcode / 4];
114         h->tb_start = mftb();
115         h->purr_start = mfspr(SPRN_PURR);
116 }
117 
118 static 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 = &__get_cpu_var(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 
132 static 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 }
166 machine_device_initcall(pseries, hcall_inst_init);
167 

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