[mirror_ubuntu-artful-kernel.git] / arch / powerpc / platforms / pseries / hvCall_inst.c

/*
 * Copyright (C) 2006 Mike Kravetz IBM Corporation
 *
 * Hypervisor Call Instrumentation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/kernel.h>
#include <linux/percpu.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/cpumask.h>
#include <asm/hvcall.h>
#include <asm/firmware.h>
#include <asm/cputable.h>
#include <asm/trace.h>

DEFINE_PER_CPU(struct hcall_stats[HCALL_STAT_ARRAY_SIZE], hcall_stats);

/*
 * Routines for displaying the statistics in debugfs
 */
static void *hc_start(struct seq_file *m, loff_t *pos)
{
	if ((int)*pos < (HCALL_STAT_ARRAY_SIZE-1))
		return (void *)(unsigned long)(*pos + 1);

	return NULL;
}

static void *hc_next(struct seq_file *m, void *p, loff_t * pos)
{
	++*pos;

	return hc_start(m, pos);
}

static void hc_stop(struct seq_file *m, void *p)
{
}

static int hc_show(struct seq_file *m, void *p)
{
	unsigned long h_num = (unsigned long)p;
	struct hcall_stats *hs = m->private;

	if (hs[h_num].num_calls) {
		if (cpu_has_feature(CPU_FTR_PURR))
			seq_printf(m, "%lu %lu %lu %lu\n", h_num<<2,
				   hs[h_num].num_calls,
				   hs[h_num].tb_total,
				   hs[h_num].purr_total);
		else
			seq_printf(m, "%lu %lu %lu\n", h_num<<2,
				   hs[h_num].num_calls,
				   hs[h_num].tb_total);
	}

	return 0;
}

static const struct seq_operations hcall_inst_seq_ops = {
        .start = hc_start,
        .next  = hc_next,
        .stop  = hc_stop,
        .show  = hc_show
};

static int hcall_inst_seq_open(struct inode *inode, struct file *file)
{
	int rc;
	struct seq_file *seq;

	rc = seq_open(file, &hcall_inst_seq_ops);
	seq = file->private_data;
	seq->private = file_inode(file)->i_private;

	return rc;
}

static const struct file_operations hcall_inst_seq_fops = {
	.open = hcall_inst_seq_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = seq_release,
};

#define	HCALL_ROOT_DIR		"hcall_inst"
#define CPU_NAME_BUF_SIZE	32


static void probe_hcall_entry(void *ignored, unsigned long opcode, unsigned long *args)
{
	struct hcall_stats *h;

	if (opcode > MAX_HCALL_OPCODE)
		return;

	h = &__get_cpu_var(hcall_stats)[opcode / 4];
	h->tb_start = mftb();
	h->purr_start = mfspr(SPRN_PURR);
}

static void probe_hcall_exit(void *ignored, unsigned long opcode, unsigned long retval,
			     unsigned long *retbuf)
{
	struct hcall_stats *h;

	if (opcode > MAX_HCALL_OPCODE)
		return;

	h = &__get_cpu_var(hcall_stats)[opcode / 4];
	h->num_calls++;
	h->tb_total += mftb() - h->tb_start;
	h->purr_total += mfspr(SPRN_PURR) - h->purr_start;
}

static int __init hcall_inst_init(void)
{
	struct dentry *hcall_root;
	struct dentry *hcall_file;
	char cpu_name_buf[CPU_NAME_BUF_SIZE];
	int cpu;

	if (!firmware_has_feature(FW_FEATURE_LPAR))
		return 0;

	if (register_trace_hcall_entry(probe_hcall_entry, NULL))
		return -EINVAL;

	if (register_trace_hcall_exit(probe_hcall_exit, NULL)) {
		unregister_trace_hcall_entry(probe_hcall_entry, NULL);
		return -EINVAL;
	}

	hcall_root = debugfs_create_dir(HCALL_ROOT_DIR, NULL);
	if (!hcall_root)
		return -ENOMEM;

	for_each_possible_cpu(cpu) {
		snprintf(cpu_name_buf, CPU_NAME_BUF_SIZE, "cpu%d", cpu);
		hcall_file = debugfs_create_file(cpu_name_buf, S_IRUGO,
						 hcall_root,
						 per_cpu(hcall_stats, cpu),
						 &hcall_inst_seq_fops);
		if (!hcall_file)
			return -ENOMEM;
	}

	return 0;
}
__initcall(hcall_inst_init);
Commit	Line	Data
57852a85 MK	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>
c8cd093a	29	#include <asm/trace.h>
57852a85 MK	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	{
dc40127c	38	if ((int)*pos < (HCALL_STAT_ARRAY_SIZE-1))
57852a85 MK	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;
6d2ad1e3	58	struct hcall_stats *hs = m->private;
57852a85 MK	59
57852a85 MK	60	if (hs[h_num].num_calls) {
dc40127c	61	if (cpu_has_feature(CPU_FTR_PURR))
57852a85 MK	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
88e9d34c	75	static const struct seq_operations hcall_inst_seq_ops = {
57852a85 MK	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;
496ad9aa	89	seq->private = file_inode(file)->i_private;
57852a85 MK	90
	91	return rc;
	92	}
	93
5dfe4c96	94	static const struct file_operations hcall_inst_seq_fops = {
57852a85 MK	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
c8cd093a	104
969ea5c5	105	static void probe_hcall_entry(void ignored, unsigned long opcode, unsigned long args)
c8cd093a AB	106	{
	107	struct hcall_stats *h;
	108
	109	if (opcode > MAX_HCALL_OPCODE)
	110	return;
	111
e4f387d8	112	h = &__get_cpu_var(hcall_stats)[opcode / 4];
c8cd093a AB	113	h->tb_start = mftb();
	114	h->purr_start = mfspr(SPRN_PURR);
	115	}
	116
969ea5c5	117	static void probe_hcall_exit(void *ignored, unsigned long opcode, unsigned long retval,
6f26353c	118	unsigned long *retbuf)
c8cd093a AB	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++;
25ef231d WS	127	h->tb_total += mftb() - h->tb_start;
25ef231d WS	128	h->purr_total += mfspr(SPRN_PURR) - h->purr_start;
c8cd093a AB	129	}
c8cd093a AB	130
57852a85 MK	131	static int __init hcall_inst_init(void)
	132	{
	133	struct dentry *hcall_root;
	134	struct dentry *hcall_file;
	135	char cpu_name_buf[CPU_NAME_BUF_SIZE];
	136	int cpu;
	137
	138	if (!firmware_has_feature(FW_FEATURE_LPAR))
	139	return 0;
	140
969ea5c5	141	if (register_trace_hcall_entry(probe_hcall_entry, NULL))
c8cd093a AB	142	return -EINVAL;
c8cd093a AB	143
969ea5c5 SR	144	if (register_trace_hcall_exit(probe_hcall_exit, NULL)) {
969ea5c5 SR	145	unregister_trace_hcall_entry(probe_hcall_entry, NULL);
c8cd093a AB	146	return -EINVAL;
	147	}
	148
57852a85 MK	149	hcall_root = debugfs_create_dir(HCALL_ROOT_DIR, NULL);
	150	if (!hcall_root)
	151	return -ENOMEM;
	152
	153	for_each_possible_cpu(cpu) {
	154	snprintf(cpu_name_buf, CPU_NAME_BUF_SIZE, "cpu%d", cpu);
	155	hcall_file = debugfs_create_file(cpu_name_buf, S_IRUGO,
	156	hcall_root,
	157	per_cpu(hcall_stats, cpu),
	158	&hcall_inst_seq_fops);
	159	if (!hcall_file)
	160	return -ENOMEM;
	161	}
	162
	163	return 0;
	164	}
	165	__initcall(hcall_inst_init);