arch/sh/oprofile/op_model_sh7750.c - linux - Git at Google

 /*
  * arch/sh/oprofile/op_model_sh7750.c
  *
  * OProfile support for SH7750/SH7750S Performance Counters
  *
  * Copyright (C) 2003, 2004  Paul Mundt
  *
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  */
 #include <linux/kernel.h>
 #include <linux/oprofile.h>
 #include <linux/profile.h>
 #include <linux/init.h>
 #include <linux/errno.h>
 #include <linux/interrupt.h>
 #include <linux/fs.h>
 #include <linux/notifier.h>
 #include <asm/uaccess.h>
 #include <asm/io.h>

 #define PM_CR_BASE	0xff000084	/* 16-bit */
 #define PM_CTR_BASE	0xff100004	/* 32-bit */

 #define PMCR1		(PM_CR_BASE  + 0x00)
 #define PMCR2		(PM_CR_BASE  + 0x04)
 #define PMCTR1H		(PM_CTR_BASE + 0x00)
 #define PMCTR1L		(PM_CTR_BASE + 0x04)
 #define PMCTR2H		(PM_CTR_BASE + 0x08)
 #define PMCTR2L		(PM_CTR_BASE + 0x0c)

 #define PMCR_PMM_MASK	0x0000003f

 #define PMCR_CLKF	0x00000100
 #define PMCR_PMCLR	0x00002000
 #define PMCR_PMST	0x00004000
 #define PMCR_PMEN	0x00008000

 #define PMCR_ENABLE	(PMCR_PMST | PMCR_PMEN)

 /*
  * SH7750/SH7750S have 2 perf counters
  */
 #define NR_CNTRS	2

 extern const char *get_cpu_subtype(void);

 struct op_counter_config {
 	unsigned long enabled;
 	unsigned long event;
 	unsigned long count;

 	/* Dummy values for userspace tool compliance */
 	unsigned long kernel;
 	unsigned long user;
 	unsigned long unit_mask;
 };

 static struct op_counter_config ctr[NR_CNTRS];

 /*
  * There are a number of events supported by each counter (33 in total).
  * Since we have 2 counters, each counter will take the event code as it
  * corresponds to the PMCR PMM setting. Each counter can be configured
  * independently.
  *
  *	Event Code	Description
  *	----------	-----------
  *
  *	0x01		Operand read access
  *	0x02		Operand write access
  *	0x03		UTLB miss
  *	0x04		Operand cache read miss
  *	0x05		Operand cache write miss
  *	0x06		Instruction fetch (w/ cache)
  *	0x07		Instruction TLB miss
  *	0x08		Instruction cache miss
  *	0x09		All operand accesses
  *	0x0a		All instruction accesses
  *	0x0b		OC RAM operand access
  *	0x0d		On-chip I/O space access
  *	0x0e		Operand access (r/w)
  *	0x0f		Operand cache miss (r/w)
  *	0x10		Branch instruction
  *	0x11		Branch taken
  *	0x12		BSR/BSRF/JSR
  *	0x13		Instruction execution
  *	0x14		Instruction execution in parallel
  *	0x15		FPU Instruction execution
  *	0x16		Interrupt
  *	0x17		NMI
  *	0x18		trapa instruction execution
  *	0x19		UBCA match
  *	0x1a		UBCB match
  *	0x21		Instruction cache fill
  *	0x22		Operand cache fill
  *	0x23		Elapsed time
  *	0x24		Pipeline freeze by I-cache miss
  *	0x25		Pipeline freeze by D-cache miss
  *	0x27		Pipeline freeze by branch instruction
  *	0x28		Pipeline freeze by CPU register
  *	0x29		Pipeline freeze by FPU
  *
  * Unfortunately we don't have a native exception or interrupt for counter
  * overflow (although since these counters can run for 16.3 days without
  * overflowing, it's not really necessary).
  *
  * OProfile on the other hand likes to have samples taken periodically, so
  * for now we just piggyback the timer interrupt to get the expected
  * behavior.
  */

 static int sh7750_timer_notify(struct notifier_block *self,
 			       unsigned long val, void *regs)
 {
 	oprofile_add_sample((struct pt_regs *)regs, 0);
 	return 0;
 }

 static struct notifier_block sh7750_timer_notifier = {
 	.notifier_call		= sh7750_timer_notify,
 };

 static u64 sh7750_read_counter(int counter)
 {
 	u32 hi, lo;

 	hi = (counter == 0) ? ctrl_inl(PMCTR1H) : ctrl_inl(PMCTR2H);
 	lo = (counter == 0) ? ctrl_inl(PMCTR1L) : ctrl_inl(PMCTR2L);

 	return (u64)((u64)(hi & 0xffff) << 32) | lo;
 }

 /*
  * Files will be in a path like:
  *
  *  /<oprofilefs mount point>/<counter number>/<file>
  *
  * So when dealing with <file>, we look to the parent dentry for the counter
  * number.
  */
 static inline int to_counter(struct file *file)
 {
 	const unsigned char *name = file->f_dentry->d_parent->d_name.name;

 	return (int)simple_strtol(name, NULL, 10);
 }

 /*
  * XXX: We have 48-bit counters, so we're probably going to want something
  * more along the lines of oprofilefs_ullong_to_user().. Truncating to
  * unsigned long works fine for now though, as long as we don't attempt to
  * profile for too horribly long.
  */
 static ssize_t sh7750_read_count(struct file *file, char __user *buf,
 				 size_t count, loff_t *ppos)
 {
 	int counter = to_counter(file);
 	u64 val = sh7750_read_counter(counter);

 	return oprofilefs_ulong_to_user((unsigned long)val, buf, count, ppos);
 }

 static ssize_t sh7750_write_count(struct file *file, const char __user *buf,
 				  size_t count, loff_t *ppos)
 {
 	int counter = to_counter(file);
 	unsigned long val;

 	if (oprofilefs_ulong_from_user(&val, buf, count))
 		return -EFAULT;

 	/*
 	 * Any write will clear the counter, although only 0 should be
 	 * written for this purpose, as we do not support setting the
 	 * counter to an arbitrary value.
 	 */
 	WARN_ON(val != 0);

 	if (counter == 0) {
 		ctrl_outw(ctrl_inw(PMCR1) | PMCR_PMCLR, PMCR1);
 	} else {
 		ctrl_outw(ctrl_inw(PMCR2) | PMCR_PMCLR, PMCR2);
 	}

 	return count;
 }

 static struct file_operations count_fops = {
 	.read		= sh7750_read_count,
 	.write		= sh7750_write_count,
 };

 static int sh7750_perf_counter_create_files(struct super_block *sb, struct dentry *root)
 {
 	int i;

 	for (i = 0; i < NR_CNTRS; i++) {
 		struct dentry *dir;
 		char buf[4];

 		snprintf(buf, sizeof(buf), "%d", i);
 		dir = oprofilefs_mkdir(sb, root, buf);

 		oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
 		oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
 		oprofilefs_create_file(sb, dir, "count", &count_fops);

 		/* Dummy entries */
 		oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
 		oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
 		oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
 	}

 	return 0;
 }

 static int sh7750_perf_counter_start(void)
 {
 	u16 pmcr;

 	/* Enable counter 1 */
 	if (ctr[0].enabled) {
 		pmcr = ctrl_inw(PMCR1);
 		WARN_ON(pmcr & PMCR_PMEN);

 		pmcr &= ~PMCR_PMM_MASK;
 		pmcr |= ctr[0].event;
 		ctrl_outw(pmcr | PMCR_ENABLE, PMCR1);
 	}

 	/* Enable counter 2 */
 	if (ctr[1].enabled) {
 		pmcr = ctrl_inw(PMCR2);
 		WARN_ON(pmcr & PMCR_PMEN);

 		pmcr &= ~PMCR_PMM_MASK;
 		pmcr |= ctr[1].event;
 		ctrl_outw(pmcr | PMCR_ENABLE, PMCR2);
 	}

 	return register_profile_notifier(&sh7750_timer_notifier);
 }

 static void sh7750_perf_counter_stop(void)
 {
 	ctrl_outw(ctrl_inw(PMCR1) & ~PMCR_PMEN, PMCR1);
 	ctrl_outw(ctrl_inw(PMCR2) & ~PMCR_PMEN, PMCR2);

 	unregister_profile_notifier(&sh7750_timer_notifier);
 }

 static struct oprofile_operations sh7750_perf_counter_ops = {
 	.create_files	= sh7750_perf_counter_create_files,
 	.start		= sh7750_perf_counter_start,
 	.stop		= sh7750_perf_counter_stop,
 };

 int __init oprofile_arch_init(struct oprofile_operations **ops)
 {
 	if (!(cpu_data->flags & CPU_HAS_PERF_COUNTER))
 		return -ENODEV;

 	sh7750_perf_counter_ops.cpu_type = (char *)get_cpu_subtype();
 	*ops = &sh7750_perf_counter_ops;

 	printk(KERN_INFO "oprofile: using SH-4 (%s) performance monitoring.\n",
 	       sh7750_perf_counter_ops.cpu_type);

 	/* Clear the counters */
 	ctrl_outw(ctrl_inw(PMCR1) | PMCR_PMCLR, PMCR1);
 	ctrl_outw(ctrl_inw(PMCR2) | PMCR_PMCLR, PMCR2);

 	return 0;
 }

 void oprofile_arch_exit(void)
 {
 }
	/*
	* arch/sh/oprofile/op_model_sh7750.c
	*
	* OProfile support for SH7750/SH7750S Performance Counters
	*
	* Copyright (C) 2003, 2004 Paul Mundt
	*
	* This file is subject to the terms and conditions of the GNU General Public
	* License. See the file "COPYING" in the main directory of this archive
	* for more details.
	*/
	#include <linux/kernel.h>
	#include <linux/oprofile.h>
	#include <linux/profile.h>
	#include <linux/init.h>
	#include <linux/errno.h>
	#include <linux/interrupt.h>
	#include <linux/fs.h>
	#include <linux/notifier.h>
	#include <asm/uaccess.h>
	#include <asm/io.h>

	#define PM_CR_BASE 0xff000084 /* 16-bit */
	#define PM_CTR_BASE 0xff100004 /* 32-bit */

	#define PMCR1 (PM_CR_BASE + 0x00)
	#define PMCR2 (PM_CR_BASE + 0x04)
	#define PMCTR1H (PM_CTR_BASE + 0x00)
	#define PMCTR1L (PM_CTR_BASE + 0x04)
	#define PMCTR2H (PM_CTR_BASE + 0x08)
	#define PMCTR2L (PM_CTR_BASE + 0x0c)

	#define PMCR_PMM_MASK 0x0000003f

	#define PMCR_CLKF 0x00000100
	#define PMCR_PMCLR 0x00002000
	#define PMCR_PMST 0x00004000
	#define PMCR_PMEN 0x00008000

	#define PMCR_ENABLE (PMCR_PMST \| PMCR_PMEN)

	/*
	* SH7750/SH7750S have 2 perf counters
	*/
	#define NR_CNTRS 2

	extern const char *get_cpu_subtype(void);

	struct op_counter_config {
	unsigned long enabled;
	unsigned long event;
	unsigned long count;

	/* Dummy values for userspace tool compliance */
	unsigned long kernel;
	unsigned long user;
	unsigned long unit_mask;
	};

	static struct op_counter_config ctr[NR_CNTRS];

	/*
	* There are a number of events supported by each counter (33 in total).
	* Since we have 2 counters, each counter will take the event code as it
	* corresponds to the PMCR PMM setting. Each counter can be configured
	* independently.
	*
	* Event Code Description
	* ---------- -----------
	*
	* 0x01 Operand read access
	* 0x02 Operand write access
	* 0x03 UTLB miss
	* 0x04 Operand cache read miss
	* 0x05 Operand cache write miss
	* 0x06 Instruction fetch (w/ cache)
	* 0x07 Instruction TLB miss
	* 0x08 Instruction cache miss
	* 0x09 All operand accesses
	* 0x0a All instruction accesses
	* 0x0b OC RAM operand access
	* 0x0d On-chip I/O space access
	* 0x0e Operand access (r/w)
	* 0x0f Operand cache miss (r/w)
	* 0x10 Branch instruction
	* 0x11 Branch taken
	* 0x12 BSR/BSRF/JSR
	* 0x13 Instruction execution
	* 0x14 Instruction execution in parallel
	* 0x15 FPU Instruction execution
	* 0x16 Interrupt
	* 0x17 NMI
	* 0x18 trapa instruction execution
	* 0x19 UBCA match
	* 0x1a UBCB match
	* 0x21 Instruction cache fill
	* 0x22 Operand cache fill
	* 0x23 Elapsed time
	* 0x24 Pipeline freeze by I-cache miss
	* 0x25 Pipeline freeze by D-cache miss
	* 0x27 Pipeline freeze by branch instruction
	* 0x28 Pipeline freeze by CPU register
	* 0x29 Pipeline freeze by FPU
	*
	* Unfortunately we don't have a native exception or interrupt for counter
	* overflow (although since these counters can run for 16.3 days without
	* overflowing, it's not really necessary).
	*
	* OProfile on the other hand likes to have samples taken periodically, so
	* for now we just piggyback the timer interrupt to get the expected
	* behavior.
	*/

	static int sh7750_timer_notify(struct notifier_block *self,
	unsigned long val, void *regs)
	{
	oprofile_add_sample((struct pt_regs *)regs, 0);
	return 0;
	}

	static struct notifier_block sh7750_timer_notifier = {
	.notifier_call = sh7750_timer_notify,
	};

	static u64 sh7750_read_counter(int counter)
	{
	u32 hi, lo;

	hi = (counter == 0) ? ctrl_inl(PMCTR1H) : ctrl_inl(PMCTR2H);
	lo = (counter == 0) ? ctrl_inl(PMCTR1L) : ctrl_inl(PMCTR2L);

	return (u64)((u64)(hi & 0xffff) << 32) \| lo;
	}

	/*
	* Files will be in a path like:
	*
	* /<oprofilefs mount point>/<counter number>/<file>
	*
	* So when dealing with <file>, we look to the parent dentry for the counter
	* number.
	*/
	static inline int to_counter(struct file *file)
	{
	const unsigned char *name = file->f_dentry->d_parent->d_name.name;

	return (int)simple_strtol(name, NULL, 10);
	}

	/*
	* XXX: We have 48-bit counters, so we're probably going to want something
	* more along the lines of oprofilefs_ullong_to_user().. Truncating to
	* unsigned long works fine for now though, as long as we don't attempt to
	* profile for too horribly long.
	*/
	static ssize_t sh7750_read_count(struct file file, char __user buf,
	size_t count, loff_t *ppos)
	{
	int counter = to_counter(file);
	u64 val = sh7750_read_counter(counter);

	return oprofilefs_ulong_to_user((unsigned long)val, buf, count, ppos);
	}

	static ssize_t sh7750_write_count(struct file file, const char __user buf,
	size_t count, loff_t *ppos)
	{
	int counter = to_counter(file);
	unsigned long val;

	if (oprofilefs_ulong_from_user(&val, buf, count))
	return -EFAULT;

	/*
	* Any write will clear the counter, although only 0 should be
	* written for this purpose, as we do not support setting the
	* counter to an arbitrary value.
	*/
	WARN_ON(val != 0);

	if (counter == 0) {
	ctrl_outw(ctrl_inw(PMCR1) \| PMCR_PMCLR, PMCR1);
	} else {
	ctrl_outw(ctrl_inw(PMCR2) \| PMCR_PMCLR, PMCR2);
	}

	return count;
	}

	static struct file_operations count_fops = {
	.read = sh7750_read_count,
	.write = sh7750_write_count,
	};

	static int sh7750_perf_counter_create_files(struct super_block sb, struct dentry root)
	{
	int i;

	for (i = 0; i < NR_CNTRS; i++) {
	struct dentry *dir;
	char buf[4];

	snprintf(buf, sizeof(buf), "%d", i);
	dir = oprofilefs_mkdir(sb, root, buf);

	oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
	oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
	oprofilefs_create_file(sb, dir, "count", &count_fops);

	/* Dummy entries */
	oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
	oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
	oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
	}

	return 0;
	}

	static int sh7750_perf_counter_start(void)
	{
	u16 pmcr;

	/* Enable counter 1 */
	if (ctr[0].enabled) {
	pmcr = ctrl_inw(PMCR1);
	WARN_ON(pmcr & PMCR_PMEN);

	pmcr &= ~PMCR_PMM_MASK;
	pmcr \|= ctr[0].event;
	ctrl_outw(pmcr \| PMCR_ENABLE, PMCR1);
	}

	/* Enable counter 2 */
	if (ctr[1].enabled) {
	pmcr = ctrl_inw(PMCR2);
	WARN_ON(pmcr & PMCR_PMEN);

	pmcr &= ~PMCR_PMM_MASK;
	pmcr \|= ctr[1].event;
	ctrl_outw(pmcr \| PMCR_ENABLE, PMCR2);
	}

	return register_profile_notifier(&sh7750_timer_notifier);
	}

	static void sh7750_perf_counter_stop(void)
	{
	ctrl_outw(ctrl_inw(PMCR1) & ~PMCR_PMEN, PMCR1);
	ctrl_outw(ctrl_inw(PMCR2) & ~PMCR_PMEN, PMCR2);

	unregister_profile_notifier(&sh7750_timer_notifier);
	}

	static struct oprofile_operations sh7750_perf_counter_ops = {
	.create_files = sh7750_perf_counter_create_files,
	.start = sh7750_perf_counter_start,
	.stop = sh7750_perf_counter_stop,
	};

	int __init oprofile_arch_init(struct oprofile_operations **ops)
	{
	if (!(cpu_data->flags & CPU_HAS_PERF_COUNTER))
	return -ENODEV;

	sh7750_perf_counter_ops.cpu_type = (char *)get_cpu_subtype();
	*ops = &sh7750_perf_counter_ops;

	printk(KERN_INFO "oprofile: using SH-4 (%s) performance monitoring.\n",
	sh7750_perf_counter_ops.cpu_type);

	/* Clear the counters */
	ctrl_outw(ctrl_inw(PMCR1) \| PMCR_PMCLR, PMCR1);
	ctrl_outw(ctrl_inw(PMCR2) \| PMCR_PMCLR, PMCR2);

	return 0;
	}

	void oprofile_arch_exit(void)
	{
	}