Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758136AbXKGOF6 (ORCPT ); Wed, 7 Nov 2007 09:05:58 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755330AbXKGOFv (ORCPT ); Wed, 7 Nov 2007 09:05:51 -0500 Received: from nat-132.atmel.no ([80.232.32.132]:59268 "EHLO relay.atmel.no" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754765AbXKGOFt (ORCPT ); Wed, 7 Nov 2007 09:05:49 -0500 From: Haavard Skinnemoen To: Philippe Elie , oprofile-list@lists.sourceforge.net Cc: kernel@avr32linux.org, linux-kernel@vger.kernel.org, Haavard Skinnemoen Subject: [RFC/PATCH] AVR32: Oprofile support Date: Wed, 7 Nov 2007 15:05:33 +0100 Message-Id: <1194444333-9264-1-git-send-email-hskinnemoen@atmel.com> X-Mailer: git-send-email 1.5.3.4 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 8002 Lines: 312 This adds the necessary architecture code to run oprofile on AVR32 using the performance counters documented by the AVR32 Architecture Manual. Signed-off-by: Haavard Skinnemoen --- This patch is meant to go on top of Mathieu Desnoyers' "Move Instrumentation Support menu to arch/Kconfig" patches, but if you want to try it out on something more mainstream, just add source "kernel/Kconfig.instrumentation" somewhere in arch/avr32/Kconfig and add AVR32 to the list of architectures OPROFILE depends on in kernel/Kconfig.instrumentation. arch/avr32/Kconfig | 3 + arch/avr32/Makefile | 1 + arch/avr32/oprofile/Makefile | 8 + arch/avr32/oprofile/op_model_avr32.c | 235 ++++++++++++++++++++++++++++++++++ 4 files changed, 247 insertions(+), 0 deletions(-) create mode 100644 arch/avr32/oprofile/Makefile create mode 100644 arch/avr32/oprofile/op_model_avr32.c diff --git a/arch/avr32/Kconfig b/arch/avr32/Kconfig index 461bfca..c7dda5f 100644 --- a/arch/avr32/Kconfig +++ b/arch/avr32/Kconfig @@ -67,6 +67,9 @@ config GENERIC_BUG default y depends on BUG +config ARCH_SUPPORTS_OPROFILE + def_bool y + config ARCH_SUPPORTS_KPROBES def_bool y diff --git a/arch/avr32/Makefile b/arch/avr32/Makefile index 8791864..f75d52c 100644 --- a/arch/avr32/Makefile +++ b/arch/avr32/Makefile @@ -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 diff --git a/arch/avr32/oprofile/Makefile b/arch/avr32/oprofile/Makefile new file mode 100644 index 0000000..1fe81c3 --- /dev/null +++ b/arch/avr32/oprofile/Makefile @@ -0,0 +1,8 @@ +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 diff --git a/arch/avr32/oprofile/op_model_avr32.c b/arch/avr32/oprofile/op_model_avr32.c new file mode 100644 index 0000000..e2f876b --- /dev/null +++ b/arch/avr32/oprofile/op_model_avr32.c @@ -0,0 +1,235 @@ +/* + * 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 +#include +#include +#include +#include +#include + +#include +#include +#include + +#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) +{ + +} -- 1.5.3.4 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/