[linux-2.6-block.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>
#include <asm/machdep.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 = this_cpu_ptr(&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 = this_cpu_ptr(&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;
}
machine_device_initcall(pseries, 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>
8e83e905	30	#include <asm/machdep.h>
57852a85 MK	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	{
dc40127c	39	if ((int)*pos < (HCALL_STAT_ARRAY_SIZE-1))
57852a85 MK	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;
6d2ad1e3	59	struct hcall_stats *hs = m->private;
57852a85 MK	60
57852a85 MK	61	if (hs[h_num].num_calls) {
dc40127c	62	if (cpu_has_feature(CPU_FTR_PURR))
57852a85 MK	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
88e9d34c	76	static const struct seq_operations hcall_inst_seq_ops = {
57852a85 MK	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;
496ad9aa	90	seq->private = file_inode(file)->i_private;
57852a85 MK	91
	92	return rc;
	93	}
	94
5dfe4c96	95	static const struct file_operations hcall_inst_seq_fops = {
57852a85 MK	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
c8cd093a	105
969ea5c5	106	static void probe_hcall_entry(void ignored, unsigned long opcode, unsigned long args)
c8cd093a AB	107	{
	108	struct hcall_stats *h;
	109
	110	if (opcode > MAX_HCALL_OPCODE)
	111	return;
	112
69111bac	113	h = this_cpu_ptr(&hcall_stats[opcode / 4]);
c8cd093a AB	114	h->tb_start = mftb();
	115	h->purr_start = mfspr(SPRN_PURR);
	116	}
	117
969ea5c5	118	static void probe_hcall_exit(void *ignored, unsigned long opcode, unsigned long retval,
6f26353c	119	unsigned long *retbuf)
c8cd093a AB	120	{
	121	struct hcall_stats *h;
	122
	123	if (opcode > MAX_HCALL_OPCODE)
	124	return;
	125
69111bac	126	h = this_cpu_ptr(&hcall_stats[opcode / 4]);
c8cd093a	127	h->num_calls++;
25ef231d WS	128	h->tb_total += mftb() - h->tb_start;
25ef231d WS	129	h->purr_total += mfspr(SPRN_PURR) - h->purr_start;
c8cd093a AB	130	}
c8cd093a AB	131
57852a85 MK	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
969ea5c5	142	if (register_trace_hcall_entry(probe_hcall_entry, NULL))
c8cd093a AB	143	return -EINVAL;
c8cd093a AB	144
969ea5c5 SR	145	if (register_trace_hcall_exit(probe_hcall_exit, NULL)) {
969ea5c5 SR	146	unregister_trace_hcall_entry(probe_hcall_entry, NULL);
c8cd093a AB	147	return -EINVAL;
	148	}
	149
57852a85 MK	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	}
8e83e905	166	machine_device_initcall(pseries, hcall_inst_init);