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/*
* Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/oprofile.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#include <asm/processor.h>
#include <asm/cputable.h>
#include <asm/oprofile_impl.h>
#define dbg(args...)
static void ctrl_write(unsigned int i, unsigned int val)
{
unsigned int tmp = 0;
unsigned long shift = 0, mask = 0;
dbg("ctrl_write %d %x\n", i, val);
switch(i) {
case 0:
tmp = mfspr(SPRN_MMCR0);
shift = 6;
mask = 0x7F;
break;
case 1:
tmp = mfspr(SPRN_MMCR0);
shift = 0;
mask = 0x3F;
break;
case 2:
tmp = mfspr(SPRN_MMCR1);
shift = 31 - 4;
mask = 0x1F;
break;
case 3:
tmp = mfspr(SPRN_MMCR1);
shift = 31 - 9;
mask = 0x1F;
break;
case 4:
tmp = mfspr(SPRN_MMCR1);
shift = 31 - 14;
mask = 0x1F;
break;
case 5:
tmp = mfspr(SPRN_MMCR1);
shift = 31 - 19;
mask = 0x1F;
break;
case 6:
tmp = mfspr(SPRN_MMCR1);
shift = 31 - 24;
mask = 0x1F;
break;
case 7:
tmp = mfspr(SPRN_MMCR1);
shift = 31 - 28;
mask = 0xF;
break;
}
tmp = tmp & ~(mask << shift);
tmp |= val << shift;
switch(i) {
case 0:
case 1:
mtspr(SPRN_MMCR0, tmp);
break;
default:
mtspr(SPRN_MMCR1, tmp);
}
dbg("ctrl_write mmcr0 %lx mmcr1 %lx\n", mfspr(SPRN_MMCR0),
mfspr(SPRN_MMCR1));
}
static unsigned long reset_value[OP_MAX_COUNTER];
static int num_counters;
static void rs64_reg_setup(struct op_counter_config *ctr,
struct op_system_config *sys,
int num_ctrs)
{
int i;
num_counters = num_ctrs;
for (i = 0; i < num_counters; ++i)
reset_value[i] = 0x80000000UL - ctr[i].count;
/* XXX setup user and kernel profiling */
}
static void rs64_cpu_setup(void *unused)
{
unsigned int mmcr0;
/* reset MMCR0 and set the freeze bit */
mmcr0 = MMCR0_FC;
mtspr(SPRN_MMCR0, mmcr0);
/* reset MMCR1, MMCRA */
mtspr(SPRN_MMCR1, 0);
if (cpu_has_feature(CPU_FTR_MMCRA))
mtspr(SPRN_MMCRA, 0);
mmcr0 |= MMCR0_FCM1|MMCR0_PMXE|MMCR0_FCECE;
/* Only applies to POWER3, but should be safe on RS64 */
mmcr0 |= MMCR0_PMC1CE|MMCR0_PMCjCE;
mtspr(SPRN_MMCR0, mmcr0);
dbg("setup on cpu %d, mmcr0 %lx\n", smp_processor_id(),
mfspr(SPRN_MMCR0));
dbg("setup on cpu %d, mmcr1 %lx\n", smp_processor_id(),
mfspr(SPRN_MMCR1));
}
static void rs64_start(struct op_counter_config *ctr)
{
int i;
unsigned int mmcr0;
/* set the PMM bit (see comment below) */
mtmsrd(mfmsr() | MSR_PMM);
for (i = 0; i < num_counters; ++i) {
if (ctr[i].enabled) {
ctr_write(i, reset_value[i]);
ctrl_write(i, ctr[i].event);
} else {
ctr_write(i, 0);
}
}
mmcr0 = mfspr(SPRN_MMCR0);
/*
* now clear the freeze bit, counting will not start until we
* rfid from this excetion, because only at that point will
* the PMM bit be cleared
*/
mmcr0 &= ~MMCR0_FC;
mtspr(SPRN_MMCR0, mmcr0);
dbg("start on cpu %d, mmcr0 %x\n", smp_processor_id(), mmcr0);
}
static void rs64_stop(void)
{
unsigned int mmcr0;
/* freeze counters */
mmcr0 = mfspr(SPRN_MMCR0);
mmcr0 |= MMCR0_FC;
mtspr(SPRN_MMCR0, mmcr0);
dbg("stop on cpu %d, mmcr0 %x\n", smp_processor_id(), mmcr0);
mb();
}
static void rs64_handle_interrupt(struct pt_regs *regs,
struct op_counter_config *ctr)
{
unsigned int mmcr0;
int is_kernel;
int val;
int i;
unsigned long pc = mfspr(SPRN_SIAR);
is_kernel = is_kernel_addr(pc);
/* set the PMM bit (see comment below) */
mtmsrd(mfmsr() | MSR_PMM);
for (i = 0; i < num_counters; ++i) {
val = ctr_read(i);
if (val < 0) {
if (ctr[i].enabled) {
oprofile_add_ext_sample(pc, regs, i, is_kernel);
ctr_write(i, reset_value[i]);
} else {
ctr_write(i, 0);
}
}
}
mmcr0 = mfspr(SPRN_MMCR0);
/* reset the perfmon trigger */
mmcr0 |= MMCR0_PMXE;
/*
* now clear the freeze bit, counting will not start until we
* rfid from this exception, because only at that point will
* the PMM bit be cleared
*/
mmcr0 &= ~MMCR0_FC;
mtspr(SPRN_MMCR0, mmcr0);
}
struct op_powerpc_model op_model_rs64 = {
.reg_setup = rs64_reg_setup,
.cpu_setup = rs64_cpu_setup,
.start = rs64_start,
.stop = rs64_stop,
.handle_interrupt = rs64_handle_interrupt,
};
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