Commit 2853ce5e authored by Haavard Skinnemoen's avatar Haavard Skinnemoen
Browse files

[AVR32] Oprofile support 



This adds the necessary architecture code to run oprofile on AVR32
using the performance counters documented by the AVR32 Architecture
Manual.

Signed-off-by: default avatarHaavard Skinnemoen <hskinnemoen@atmel.com>
Acked-by: default avatarPhilippe Elie <phil.el@wanadoo.fr>
parent a7f5bf9b

arch/avr32/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -54,6 +54,9 @@ config ARCH_HAS_ILOG2_U32 
config ARCH_HAS_ILOG2_U64

	def_bool n



config ARCH_SUPPORTS_OPROFILE

	def_bool y



config GENERIC_HWEIGHT

	def_bool y

arch/avr32/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ core-$(CONFIG_BOARD_ATNGW100) += arch/avr32/boards/atngw100/ 
core-$(CONFIG_LOADER_U_BOOT)		+= arch/avr32/boot/u-boot/

core-y					+= arch/avr32/kernel/

core-y					+= arch/avr32/mm/

drivers-$(CONFIG_OPROFILE)		+= arch/avr32/oprofile/

libs-y					+= arch/avr32/lib/



archincdir-$(CONFIG_PLATFORM_AT32AP)	:= arch-at32ap

arch/avr32/oprofile/Makefile

0 → 100644
+8 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_OPROFILE) += oprofile.o



oprofile-y		:= $(addprefix ../../../drivers/oprofile/,	\

				oprof.o cpu_buffer.o buffer_sync.o	\

				event_buffer.o oprofile_files.o		\

				oprofilefs.o oprofile_stats.o		\

				timer_int.o)

oprofile-y		+= op_model_avr32.o

arch/avr32/oprofile/op_model_avr32.c

0 → 100644
+235 −0
Original line number Diff line number Diff line 
/*

 * AVR32 Performance Counter Driver

 *

 * Copyright (C) 2005-2007 Atmel Corporation

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 * Author: Ronny Pedersen

 */

#include <linux/errno.h>

#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/oprofile.h>

#include <linux/sched.h>

#include <linux/types.h>



#include <asm/intc.h>

#include <asm/sysreg.h>

#include <asm/system.h>



#define AVR32_PERFCTR_IRQ_GROUP	0

#define AVR32_PERFCTR_IRQ_LINE	1



enum { PCCNT, PCNT0, PCNT1, NR_counter };



struct avr32_perf_counter {

	unsigned long	enabled;

	unsigned long	event;

	unsigned long	count;

	unsigned long	unit_mask;

	unsigned long	kernel;

	unsigned long	user;



	u32		ie_mask;

	u32		flag_mask;

};



static struct avr32_perf_counter counter[NR_counter] = {

	{

		.ie_mask	= SYSREG_BIT(IEC),

		.flag_mask	= SYSREG_BIT(FC),

	}, {

		.ie_mask	= SYSREG_BIT(IE0),

		.flag_mask	= SYSREG_BIT(F0),

	}, {

		.ie_mask	= SYSREG_BIT(IE1),

		.flag_mask	= SYSREG_BIT(F1),

	},

};



static void avr32_perf_counter_reset(void)

{

	/* Reset all counter and disable/clear all interrupts */

	sysreg_write(PCCR, (SYSREG_BIT(PCCR_R)

				| SYSREG_BIT(PCCR_C)

				| SYSREG_BIT(FC)

				| SYSREG_BIT(F0)

				| SYSREG_BIT(F1)));

}



static irqreturn_t avr32_perf_counter_interrupt(int irq, void *dev_id)

{

	struct avr32_perf_counter *ctr = dev_id;

	struct pt_regs *regs;

	u32 pccr;



	if (likely(!(intc_get_pending(AVR32_PERFCTR_IRQ_GROUP)

					& (1 << AVR32_PERFCTR_IRQ_LINE))))

		return IRQ_NONE;



	regs = get_irq_regs();

	pccr = sysreg_read(PCCR);



	/* Clear the interrupt flags we're about to handle */

	sysreg_write(PCCR, pccr);



	/* PCCNT */

	if (ctr->enabled && (pccr & ctr->flag_mask)) {

		sysreg_write(PCCNT, -ctr->count);

		oprofile_add_sample(regs, PCCNT);

	}

	ctr++;

	/* PCNT0 */

	if (ctr->enabled && (pccr & ctr->flag_mask)) {

		sysreg_write(PCNT0, -ctr->count);

		oprofile_add_sample(regs, PCNT0);

	}

	ctr++;

	/* PCNT1 */

	if (ctr->enabled && (pccr & ctr->flag_mask)) {

		sysreg_write(PCNT1, -ctr->count);

		oprofile_add_sample(regs, PCNT1);

	}



	return IRQ_HANDLED;

}



static int avr32_perf_counter_create_files(struct super_block *sb,

		struct dentry *root)

{

	struct dentry *dir;

	unsigned int i;

	char filename[4];



	for (i = 0; i < NR_counter; i++) {

		snprintf(filename, sizeof(filename), "%u", i);

		dir = oprofilefs_mkdir(sb, root, filename);



		oprofilefs_create_ulong(sb, dir, "enabled",

				&counter[i].enabled);

		oprofilefs_create_ulong(sb, dir, "event",

				&counter[i].event);

		oprofilefs_create_ulong(sb, dir, "count",

				&counter[i].count);



		/* Dummy entries */

		oprofilefs_create_ulong(sb, dir, "kernel",

				&counter[i].kernel);

		oprofilefs_create_ulong(sb, dir, "user",

				&counter[i].user);

		oprofilefs_create_ulong(sb, dir, "unit_mask",

				&counter[i].unit_mask);

	}



	return 0;

}



static int avr32_perf_counter_setup(void)

{

	struct avr32_perf_counter *ctr;

	u32 pccr;

	int ret;

	int i;



	pr_debug("avr32_perf_counter_setup\n");



	if (sysreg_read(PCCR) & SYSREG_BIT(PCCR_E)) {

		printk(KERN_ERR

			"oprofile: setup: perf counter already enabled\n");

		return -EBUSY;

	}



	ret = request_irq(AVR32_PERFCTR_IRQ_GROUP,

			avr32_perf_counter_interrupt, IRQF_SHARED,

			"oprofile", counter);

	if (ret)

		return ret;



	avr32_perf_counter_reset();



	pccr = 0;

	for (i = PCCNT; i < NR_counter; i++) {

		ctr = &counter[i];

		if (!ctr->enabled)

			continue;



		pr_debug("enabling counter %d...\n", i);



		pccr |= ctr->ie_mask;



		switch (i) {

		case PCCNT:

			/* PCCNT always counts cycles, so no events */

			sysreg_write(PCCNT, -ctr->count);

			break;

		case PCNT0:

			pccr |= SYSREG_BF(CONF0, ctr->event);

			sysreg_write(PCNT0, -ctr->count);

			break;

		case PCNT1:

			pccr |= SYSREG_BF(CONF1, ctr->event);

			sysreg_write(PCNT1, -ctr->count);

			break;

		}

	}



	pr_debug("oprofile: writing 0x%x to PCCR...\n", pccr);



	sysreg_write(PCCR, pccr);



	return 0;

}



static void avr32_perf_counter_shutdown(void)

{

	pr_debug("avr32_perf_counter_shutdown\n");



	avr32_perf_counter_reset();

	free_irq(AVR32_PERFCTR_IRQ_GROUP, counter);

}



static int avr32_perf_counter_start(void)

{

	pr_debug("avr32_perf_counter_start\n");



	sysreg_write(PCCR, sysreg_read(PCCR) | SYSREG_BIT(PCCR_E));



	return 0;

}



static void avr32_perf_counter_stop(void)

{

	pr_debug("avr32_perf_counter_stop\n");



	sysreg_write(PCCR, sysreg_read(PCCR) & ~SYSREG_BIT(PCCR_E));

}



static struct oprofile_operations avr32_perf_counter_ops __initdata = {

	.create_files	= avr32_perf_counter_create_files,

	.setup		= avr32_perf_counter_setup,

	.shutdown	= avr32_perf_counter_shutdown,

	.start		= avr32_perf_counter_start,

	.stop		= avr32_perf_counter_stop,

	.cpu_type	= "avr32",

};



int __init oprofile_arch_init(struct oprofile_operations *ops)

{

	if (!(current_cpu_data.features & AVR32_FEATURE_PCTR))

		return -ENODEV;



	memcpy(ops, &avr32_perf_counter_ops,

			sizeof(struct oprofile_operations));



	printk(KERN_INFO "oprofile: using AVR32 performance monitoring.\n");



	return 0;

}



void oprofile_arch_exit(void)

{



}

CRA Git | Maintained and supported by SUSTech CRA and CCSE