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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 
 31 DEFINE_PER_CPU(struct hcall_stats[HCALL_STAT_ARRAY_SIZE], hcall_stats);
 32 
 33 /*
 34  * Routines for displaying the statistics in debugfs
 35  */
 36 static 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 
 44 static void *hc_next(struct seq_file *m, void *p, loff_t * pos)
 45 {
 46         ++*pos;
 47 
 48         return hc_start(m, pos);
 49 }
 50 
 51 static void hc_stop(struct seq_file *m, void *p)
 52 {
 53 }
 54 
 55 static int hc_show(struct seq_file *m, void *p)
 56 {
 57         unsigned long h_num = (unsigned long)p;
 58         struct hcall_stats *hs = (struct hcall_stats *)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 
 75 static 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 
 82 static 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 
 94 static 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 
105 static void probe_hcall_entry(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 
117 static void probe_hcall_exit(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         put_cpu_var(hcall_stats);
131 }
132 
133 static int __init hcall_inst_init(void)
134 {
135         struct dentry *hcall_root;
136         struct dentry *hcall_file;
137         char cpu_name_buf[CPU_NAME_BUF_SIZE];
138         int cpu;
139 
140         if (!firmware_has_feature(FW_FEATURE_LPAR))
141                 return 0;
142 
143         if (register_trace_hcall_entry(probe_hcall_entry))
144                 return -EINVAL;
145 
146         if (register_trace_hcall_exit(probe_hcall_exit)) {
147                 unregister_trace_hcall_entry(probe_hcall_entry);
148                 return -EINVAL;
149         }
150 
151         hcall_root = debugfs_create_dir(HCALL_ROOT_DIR, NULL);
152         if (!hcall_root)
153                 return -ENOMEM;
154 
155         for_each_possible_cpu(cpu) {
156                 snprintf(cpu_name_buf, CPU_NAME_BUF_SIZE, "cpu%d", cpu);
157                 hcall_file = debugfs_create_file(cpu_name_buf, S_IRUGO,
158                                                  hcall_root,
159                                                  per_cpu(hcall_stats, cpu),
160                                                  &hcall_inst_seq_fops);
161                 if (!hcall_file)
162                         return -ENOMEM;
163         }
164 
165         return 0;
166 }
167 __initcall(hcall_inst_init);
168 

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