linux/arch/powerpc/oprofile/op_model_pa6t.c
Thomas Gleixner 4505153954 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333
Based on 1 normalized pattern(s):

  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 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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 136 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190530000436.384967451@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:37:06 +02:00

228 lines
5.2 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2006-2007 PA Semi, Inc
*
* Author: Shashi Rao, PA Semi
*
* Maintained by: Olof Johansson <olof@lixom.net>
*
* Based on arch/powerpc/oprofile/op_model_power4.c
*/
#include <linux/oprofile.h>
#include <linux/smp.h>
#include <linux/percpu.h>
#include <asm/processor.h>
#include <asm/cputable.h>
#include <asm/oprofile_impl.h>
#include <asm/reg.h>
static unsigned char oprofile_running;
/* mmcr values are set in pa6t_reg_setup, used in pa6t_cpu_setup */
static u64 mmcr0_val;
static u64 mmcr1_val;
/* inited in pa6t_reg_setup */
static u64 reset_value[OP_MAX_COUNTER];
static inline u64 ctr_read(unsigned int i)
{
switch (i) {
case 0:
return mfspr(SPRN_PA6T_PMC0);
case 1:
return mfspr(SPRN_PA6T_PMC1);
case 2:
return mfspr(SPRN_PA6T_PMC2);
case 3:
return mfspr(SPRN_PA6T_PMC3);
case 4:
return mfspr(SPRN_PA6T_PMC4);
case 5:
return mfspr(SPRN_PA6T_PMC5);
default:
printk(KERN_ERR "ctr_read called with bad arg %u\n", i);
return 0;
}
}
static inline void ctr_write(unsigned int i, u64 val)
{
switch (i) {
case 0:
mtspr(SPRN_PA6T_PMC0, val);
break;
case 1:
mtspr(SPRN_PA6T_PMC1, val);
break;
case 2:
mtspr(SPRN_PA6T_PMC2, val);
break;
case 3:
mtspr(SPRN_PA6T_PMC3, val);
break;
case 4:
mtspr(SPRN_PA6T_PMC4, val);
break;
case 5:
mtspr(SPRN_PA6T_PMC5, val);
break;
default:
printk(KERN_ERR "ctr_write called with bad arg %u\n", i);
break;
}
}
/* precompute the values to stuff in the hardware registers */
static int pa6t_reg_setup(struct op_counter_config *ctr,
struct op_system_config *sys,
int num_ctrs)
{
int pmc;
/*
* adjust the mmcr0.en[0-5] and mmcr0.inten[0-5] values obtained from the
* event_mappings file by turning off the counters that the user doesn't
* care about
*
* setup user and kernel profiling
*/
for (pmc = 0; pmc < cur_cpu_spec->num_pmcs; pmc++)
if (!ctr[pmc].enabled) {
sys->mmcr0 &= ~(0x1UL << pmc);
sys->mmcr0 &= ~(0x1UL << (pmc+12));
pr_debug("turned off counter %u\n", pmc);
}
if (sys->enable_kernel)
sys->mmcr0 |= PA6T_MMCR0_SUPEN | PA6T_MMCR0_HYPEN;
else
sys->mmcr0 &= ~(PA6T_MMCR0_SUPEN | PA6T_MMCR0_HYPEN);
if (sys->enable_user)
sys->mmcr0 |= PA6T_MMCR0_PREN;
else
sys->mmcr0 &= ~PA6T_MMCR0_PREN;
/*
* The performance counter event settings are given in the mmcr0 and
* mmcr1 values passed from the user in the op_system_config
* structure (sys variable).
*/
mmcr0_val = sys->mmcr0;
mmcr1_val = sys->mmcr1;
pr_debug("mmcr0_val inited to %016lx\n", sys->mmcr0);
pr_debug("mmcr1_val inited to %016lx\n", sys->mmcr1);
for (pmc = 0; pmc < cur_cpu_spec->num_pmcs; pmc++) {
/* counters are 40 bit. Move to cputable at some point? */
reset_value[pmc] = (0x1UL << 39) - ctr[pmc].count;
pr_debug("reset_value for pmc%u inited to 0x%llx\n",
pmc, reset_value[pmc]);
}
return 0;
}
/* configure registers on this cpu */
static int pa6t_cpu_setup(struct op_counter_config *ctr)
{
u64 mmcr0 = mmcr0_val;
u64 mmcr1 = mmcr1_val;
/* Default is all PMCs off */
mmcr0 &= ~(0x3FUL);
mtspr(SPRN_PA6T_MMCR0, mmcr0);
/* program selected programmable events in */
mtspr(SPRN_PA6T_MMCR1, mmcr1);
pr_debug("setup on cpu %d, mmcr0 %016lx\n", smp_processor_id(),
mfspr(SPRN_PA6T_MMCR0));
pr_debug("setup on cpu %d, mmcr1 %016lx\n", smp_processor_id(),
mfspr(SPRN_PA6T_MMCR1));
return 0;
}
static int pa6t_start(struct op_counter_config *ctr)
{
int i;
/* Hold off event counting until rfid */
u64 mmcr0 = mmcr0_val | PA6T_MMCR0_HANDDIS;
for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
if (ctr[i].enabled)
ctr_write(i, reset_value[i]);
else
ctr_write(i, 0UL);
mtspr(SPRN_PA6T_MMCR0, mmcr0);
oprofile_running = 1;
pr_debug("start on cpu %d, mmcr0 %llx\n", smp_processor_id(), mmcr0);
return 0;
}
static void pa6t_stop(void)
{
u64 mmcr0;
/* freeze counters */
mmcr0 = mfspr(SPRN_PA6T_MMCR0);
mmcr0 |= PA6T_MMCR0_FCM0;
mtspr(SPRN_PA6T_MMCR0, mmcr0);
oprofile_running = 0;
pr_debug("stop on cpu %d, mmcr0 %llx\n", smp_processor_id(), mmcr0);
}
/* handle the perfmon overflow vector */
static void pa6t_handle_interrupt(struct pt_regs *regs,
struct op_counter_config *ctr)
{
unsigned long pc = mfspr(SPRN_PA6T_SIAR);
int is_kernel = is_kernel_addr(pc);
u64 val;
int i;
u64 mmcr0;
/* disable perfmon counting until rfid */
mmcr0 = mfspr(SPRN_PA6T_MMCR0);
mtspr(SPRN_PA6T_MMCR0, mmcr0 | PA6T_MMCR0_HANDDIS);
/* Record samples. We've got one global bit for whether a sample
* was taken, so add it for any counter that triggered overflow.
*/
for (i = 0; i < cur_cpu_spec->num_pmcs; i++) {
val = ctr_read(i);
if (val & (0x1UL << 39)) { /* Overflow bit set */
if (oprofile_running && ctr[i].enabled) {
if (mmcr0 & PA6T_MMCR0_SIARLOG)
oprofile_add_ext_sample(pc, regs, i, is_kernel);
ctr_write(i, reset_value[i]);
} else {
ctr_write(i, 0UL);
}
}
}
/* Restore mmcr0 to a good known value since the PMI changes it */
mmcr0 = mmcr0_val | PA6T_MMCR0_HANDDIS;
mtspr(SPRN_PA6T_MMCR0, mmcr0);
}
struct op_powerpc_model op_model_pa6t = {
.reg_setup = pa6t_reg_setup,
.cpu_setup = pa6t_cpu_setup,
.start = pa6t_start,
.stop = pa6t_stop,
.handle_interrupt = pa6t_handle_interrupt,
};