177 lines
4.3 KiB
C
177 lines
4.3 KiB
C
/*
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* Copyright (C) 2006 Mike Kravetz IBM Corporation
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*
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* Hypervisor Call Instrumentation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/percpu.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/cpumask.h>
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#include <asm/hvcall.h>
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#include <asm/firmware.h>
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#include <asm/cputable.h>
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#include <asm/trace.h>
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#include <asm/machdep.h>
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/* For hcall instrumentation. One structure per-hcall, per-CPU */
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struct hcall_stats {
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unsigned long num_calls; /* number of calls (on this CPU) */
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unsigned long tb_total; /* total wall time (mftb) of calls. */
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unsigned long purr_total; /* total cpu time (PURR) of calls. */
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unsigned long tb_start;
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unsigned long purr_start;
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};
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#define HCALL_STAT_ARRAY_SIZE ((MAX_HCALL_OPCODE >> 2) + 1)
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DEFINE_PER_CPU(struct hcall_stats[HCALL_STAT_ARRAY_SIZE], hcall_stats);
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/*
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* Routines for displaying the statistics in debugfs
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*/
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static void *hc_start(struct seq_file *m, loff_t *pos)
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{
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if ((int)*pos < (HCALL_STAT_ARRAY_SIZE-1))
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return (void *)(unsigned long)(*pos + 1);
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return NULL;
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}
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static void *hc_next(struct seq_file *m, void *p, loff_t * pos)
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{
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++*pos;
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return hc_start(m, pos);
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}
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static void hc_stop(struct seq_file *m, void *p)
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{
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}
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static int hc_show(struct seq_file *m, void *p)
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{
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unsigned long h_num = (unsigned long)p;
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struct hcall_stats *hs = m->private;
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if (hs[h_num].num_calls) {
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if (cpu_has_feature(CPU_FTR_PURR))
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seq_printf(m, "%lu %lu %lu %lu\n", h_num<<2,
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hs[h_num].num_calls,
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hs[h_num].tb_total,
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hs[h_num].purr_total);
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else
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seq_printf(m, "%lu %lu %lu\n", h_num<<2,
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hs[h_num].num_calls,
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hs[h_num].tb_total);
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}
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return 0;
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}
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static const struct seq_operations hcall_inst_seq_ops = {
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.start = hc_start,
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.next = hc_next,
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.stop = hc_stop,
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.show = hc_show
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};
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static int hcall_inst_seq_open(struct inode *inode, struct file *file)
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{
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int rc;
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struct seq_file *seq;
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rc = seq_open(file, &hcall_inst_seq_ops);
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seq = file->private_data;
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seq->private = file_inode(file)->i_private;
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return rc;
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}
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static const struct file_operations hcall_inst_seq_fops = {
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.open = hcall_inst_seq_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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#define HCALL_ROOT_DIR "hcall_inst"
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#define CPU_NAME_BUF_SIZE 32
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static void probe_hcall_entry(void *ignored, unsigned long opcode, unsigned long *args)
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{
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struct hcall_stats *h;
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if (opcode > MAX_HCALL_OPCODE)
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return;
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h = this_cpu_ptr(&hcall_stats[opcode / 4]);
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h->tb_start = mftb();
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h->purr_start = mfspr(SPRN_PURR);
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}
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static void probe_hcall_exit(void *ignored, unsigned long opcode, long retval,
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unsigned long *retbuf)
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{
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struct hcall_stats *h;
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if (opcode > MAX_HCALL_OPCODE)
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return;
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h = this_cpu_ptr(&hcall_stats[opcode / 4]);
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h->num_calls++;
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h->tb_total += mftb() - h->tb_start;
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h->purr_total += mfspr(SPRN_PURR) - h->purr_start;
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}
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static int __init hcall_inst_init(void)
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{
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struct dentry *hcall_root;
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struct dentry *hcall_file;
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char cpu_name_buf[CPU_NAME_BUF_SIZE];
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int cpu;
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if (!firmware_has_feature(FW_FEATURE_LPAR))
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return 0;
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if (register_trace_hcall_entry(probe_hcall_entry, NULL))
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return -EINVAL;
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if (register_trace_hcall_exit(probe_hcall_exit, NULL)) {
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unregister_trace_hcall_entry(probe_hcall_entry, NULL);
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return -EINVAL;
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}
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hcall_root = debugfs_create_dir(HCALL_ROOT_DIR, NULL);
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if (!hcall_root)
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return -ENOMEM;
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for_each_possible_cpu(cpu) {
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snprintf(cpu_name_buf, CPU_NAME_BUF_SIZE, "cpu%d", cpu);
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hcall_file = debugfs_create_file(cpu_name_buf, 0444,
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hcall_root,
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per_cpu(hcall_stats, cpu),
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&hcall_inst_seq_fops);
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if (!hcall_file)
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return -ENOMEM;
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}
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return 0;
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}
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machine_device_initcall(pseries, hcall_inst_init);
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