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Re: [PATCH V2] oprofile: VR5500 performance counter driver

To: Ralf Baechle <ralf@linux-mips.org>
Subject: Re: [PATCH V2] oprofile: VR5500 performance counter driver
From: Robert Richter <robert.richter@amd.com>
Date: Tue, 23 Jun 2009 11:29:01 +0200
Cc: Mark Asselstine <mark.asselstine@windriver.com>, linux-mips@linux-mips.org, oprofile-list@lists.sf.net
In-reply-to: <20090303110755.GD10085@erda.amd.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20090225165953.GF25042@erda.amd.com> <1235681374-19952-1-git-send-email-mark.asselstine@windriver.com> <20090303110755.GD10085@erda.amd.com>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.16 (2007-06-09)
On 03.03.09 12:07:55, Robert Richter wrote:
> On 26.02.09 15:49:34, Mark Asselstine wrote:
> > This is inspired by op_model_mipsxx.c with some modification
> > in regards to register layout and overflow handling. This has
> > been tested on a NEC VR5500 board and shown to produce sane
> > results.
> > 
> > Signed-off-by: Mark Asselstine <mark.asselstine@windriver.com>
> > ---
> > 
> > I have left this as a new file as there is enough differences
> > to make combining it combersome. If pushed I would possibly
> > change my mind but I am not convinced yet. The userspace
> > events are seen as mips/vr5500 so if there is a desire to
> > have everything be r5500 some userspace changes would need
> > to be made.
> > 
> >  arch/mips/oprofile/Makefile         |    1 +
> >  arch/mips/oprofile/common.c         |    5 +
> >  arch/mips/oprofile/op_model_r5500.c |  161 
> > +++++++++++++++++++++++++++++++++++
> 
> 
> Mark,
> 
> the Kconfig option for CONFIG_CPU_R5500 is still missing otherwise the
> patch itself looks fine.
> 
> Ralf,
> 
> do you agree on introducing a separate file for this cpu model?
> Please ack.

Ralf,

I still have this patch in my queue. Do you have any opinions here?
op_model_r5500.c is very similar to op_model_mipsxx.c, it partly
introduces duplicate code.

Thanks,

-Robert

> >  3 files changed, 167 insertions(+), 0 deletions(-)
> >  create mode 100644 arch/mips/oprofile/op_model_r5500.c
> >  
> > diff --git a/arch/mips/oprofile/Makefile b/arch/mips/oprofile/Makefile
> > index bf3be6f..586e64e 100644
> > --- a/arch/mips/oprofile/Makefile
> > +++ b/arch/mips/oprofile/Makefile
> > @@ -14,4 +14,5 @@ oprofile-$(CONFIG_CPU_MIPS32)             += 
> > op_model_mipsxx.o
> >  oprofile-$(CONFIG_CPU_MIPS64)              += op_model_mipsxx.o
> >  oprofile-$(CONFIG_CPU_R10000)              += op_model_mipsxx.o
> >  oprofile-$(CONFIG_CPU_SB1)         += op_model_mipsxx.o
> > +oprofile-$(CONFIG_CPU_R5500)               += op_model_r5500.o
> >  oprofile-$(CONFIG_CPU_RM9000)              += op_model_rm9000.o
> > diff --git a/arch/mips/oprofile/common.c b/arch/mips/oprofile/common.c
> > index 3bf3354..26780c7 100644
> > --- a/arch/mips/oprofile/common.c
> > +++ b/arch/mips/oprofile/common.c
> > @@ -16,6 +16,7 @@
> >  
> >  extern struct op_mips_model op_model_mipsxx_ops __attribute__((weak));
> >  extern struct op_mips_model op_model_rm9000_ops __attribute__((weak));
> > +extern struct op_mips_model op_model_r5500_ops __attribute__((weak));
> >  
> >  static struct op_mips_model *model;
> >  
> > @@ -93,6 +94,10 @@ int __init oprofile_arch_init(struct oprofile_operations 
> > *ops)
> >     case CPU_RM9000:
> >             lmodel = &op_model_rm9000_ops;
> >             break;
> > +
> > +   case CPU_R5500:
> > +           lmodel = &op_model_r5500_ops;
> > +           break;
> >     };
> >  
> >     if (!lmodel)
> > diff --git a/arch/mips/oprofile/op_model_r5500.c 
> > b/arch/mips/oprofile/op_model_r5500.c
> > new file mode 100644
> > index 0000000..9b0d20f
> > --- /dev/null
> > +++ b/arch/mips/oprofile/op_model_r5500.c
> > @@ -0,0 +1,161 @@
> > +/*
> > + * 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.
> > + *
> > + * Copyright (c) 2009 Wind River Systems, Inc.
> > + *
> > + * Derived from op_model_mipsxx.c Copyright Ralf Baechle, MIPS 
> > Technologies Inc
> > + */
> > +#include <linux/oprofile.h>
> > +#include <linux/interrupt.h>
> > +#include <asm/irq_regs.h>
> > +
> > +#include "op_impl.h"
> > +
> > +#define M_PERFCTL_EXL                      (1UL      <<  0)
> > +#define M_PERFCTL_KERNEL           (1UL      <<  1)
> > +#define M_PERFCTL_SUPERVISOR               (1UL      <<  2)
> > +#define M_PERFCTL_USER                     (1UL      <<  3)
> > +#define M_PERFCTL_INTERRUPT_ENABLE (1UL      <<  4)
> > +#define M_PERFCTL_INTERRUPT                (1UL      <<  5)
> > +#define M_PERFCTL_EVENT(event)             (((event) & 0xf)  << 6)
> > +#define M_PERFCTL_COUNT_ENABLE             (1UL      <<  10)
> > +
> > +#define NUM_COUNTERS                    2
> > +
> > +static int (*save_perf_irq) (void);
> > +
> > +struct op_mips_model op_model_r5500_ops;
> > +
> > +static struct r5500_register_config {
> > +   unsigned int control[NUM_COUNTERS];
> > +   unsigned int counter[NUM_COUNTERS];
> > +} reg;
> > +
> > +/* Compute all of the registers in preparation for enabling profiling.  */
> > +static void r5500_reg_setup(struct op_counter_config *ctr)
> > +{
> > +   int i;
> > +   unsigned int counters = NUM_COUNTERS;
> > +
> > +   /* Compute the performance counter control word.  */
> > +   for (i = 0; i < counters; i++) {
> > +           reg.control[i] = 0;
> > +           reg.counter[i] = 0;
> > +
> > +           if (!ctr[i].enabled)
> > +                   continue;
> > +
> > +           reg.control[i] = M_PERFCTL_EVENT(ctr[i].event) |
> > +               M_PERFCTL_INTERRUPT_ENABLE | M_PERFCTL_COUNT_ENABLE;
> > +           if (ctr[i].kernel)
> > +                   reg.control[i] |= M_PERFCTL_KERNEL;
> > +           if (ctr[i].user)
> > +                   reg.control[i] |= M_PERFCTL_USER;
> > +           if (ctr[i].exl)
> > +                   reg.control[i] |= M_PERFCTL_EXL;
> > +
> > +           reg.counter[i] = 0xffffffff - ctr[i].count + 1;
> > +   }
> > +}
> > +
> > +/* Program all of the registers in preparation for enabling profiling.  */
> > +static void r5500_cpu_setup(void *args)
> > +{
> > +   write_c0_perfctrl1(0);
> > +   write_c0_perfcntr1(reg.counter[1]);
> > +
> > +   write_c0_perfctrl0(0);
> > +   write_c0_perfcntr0(reg.counter[0]);
> > +}
> > +
> > +/* Start all counters on current CPU */
> > +static void r5500_cpu_start(void *args)
> > +{
> > +   write_c0_perfctrl1(reg.control[1]);
> > +   write_c0_perfctrl0(reg.control[0]);
> > +}
> > +
> > +/* Stop all counters on current CPU */
> > +static void r5500_cpu_stop(void *args)
> > +{
> > +   write_c0_perfctrl1(0);
> > +   write_c0_perfctrl0(0);
> > +}
> > +
> > +static int r5500_perfcount_handler(void)
> > +{
> > +   unsigned int control;
> > +   unsigned int counter;
> > +   int handled = IRQ_NONE;
> > +
> > +   control = read_c0_perfctrl0();
> > +   counter = read_c0_perfcntr0();
> > +   if ((control & M_PERFCTL_INTERRUPT_ENABLE) &&
> > +                   (control & M_PERFCTL_INTERRUPT)) {
> > +           oprofile_add_sample(get_irq_regs(), 0);
> > +           write_c0_perfcntr0(reg.counter[0]);
> > +           write_c0_perfctrl0(control & ~M_PERFCTL_INTERRUPT);
> > +           handled = IRQ_HANDLED;
> > +   }
> > +
> > +   control = read_c0_perfctrl1();
> > +   counter = read_c0_perfcntr1();
> > +   if ((control & M_PERFCTL_INTERRUPT_ENABLE) &&
> > +                   (control & M_PERFCTL_INTERRUPT)) {
> > +           oprofile_add_sample(get_irq_regs(), 1);
> > +           write_c0_perfcntr1(reg.counter[1]);
> > +           write_c0_perfctrl1(control & ~M_PERFCTL_INTERRUPT);
> > +           handled = IRQ_HANDLED;
> > +   }
> > +
> > +   return handled;
> > +}
> > +
> > +static void reset_counters(void *arg)
> > +{
> > +   write_c0_perfctrl1(0);
> > +   write_c0_perfcntr1(0);
> > +
> > +   write_c0_perfctrl0(0);
> > +   write_c0_perfcntr0(0);
> > +}
> > +
> > +static int __init r5500_init(void)
> > +{
> > +   on_each_cpu(reset_counters, NULL, 1);
> > +
> > +   switch (current_cpu_type()) {
> > +   case CPU_R5500:
> > +           op_model_r5500_ops.cpu_type = "mips/vr5500";
> > +           break;
> > +
> > +   default:
> > +           printk(KERN_ERR "Profiling unsupported for this CPU\n");
> > +
> > +           return -ENODEV;
> > +   }
> > +
> > +   save_perf_irq = perf_irq;
> > +   perf_irq = r5500_perfcount_handler;
> > +
> > +   return 0;
> > +}
> > +
> > +static void r5500_exit(void)
> > +{
> > +   on_each_cpu(reset_counters, NULL, 1);
> > +
> > +   perf_irq = save_perf_irq;
> > +}
> > +
> > +struct op_mips_model op_model_r5500_ops = {
> > +   .reg_setup     = r5500_reg_setup,
> > +   .cpu_setup     = r5500_cpu_setup,
> > +   .init          = r5500_init,
> > +   .exit          = r5500_exit,
> > +   .cpu_start     = r5500_cpu_start,
> > +   .cpu_stop      = r5500_cpu_stop,
> > +   .num_counters  = NUM_COUNTERS,
> > +};
> > -- 
> > 1.6.0.3
> > 
> > 
> > ------------------------------------------------------------------------------
> > Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA
> > -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise
> > -Strategies to boost innovation and cut costs with open source participation
> > -Receive a $600 discount off the registration fee with the source code: SFAD
> > http://p.sf.net/sfu/XcvMzF8H
> > _______________________________________________
> > oprofile-list mailing list
> > oprofile-list@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/oprofile-list
> > 
> 
> -- 
> Advanced Micro Devices, Inc.
> Operating System Research Center
> email: robert.richter@amd.com

-- 
Advanced Micro Devices, Inc.
Operating System Research Center
email: robert.richter@amd.com


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