- 根目录:
- arch
- powerpc
- oprofile
- op_model_power4.c
/*
* Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
* Added mmcra[slot] support:
* Copyright (C) 2006-2007 Will Schmidt <willschm@us.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/firmware.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#include <asm/processor.h>
#include <asm/cputable.h>
#include <asm/rtas.h>
#include <asm/oprofile_impl.h>
#include <asm/reg.h>
#define dbg(args...)
static unsigned long reset_value[OP_MAX_COUNTER];
static int oprofile_running;
static int use_slot_nums;
/* mmcr values are set in power4_reg_setup, used in power4_cpu_setup */
static u32 mmcr0_val;
static u64 mmcr1_val;
static u64 mmcra_val;
static int power4_reg_setup(struct op_counter_config *ctr,
struct op_system_config *sys,
int num_ctrs)
{
int i;
/*
* The performance counter event settings are given in the mmcr0,
* mmcr1 and mmcra values passed from the user in the
* op_system_config structure (sys variable).
*/
mmcr0_val = sys->mmcr0;
mmcr1_val = sys->mmcr1;
mmcra_val = sys->mmcra;
for (i = 0; i < cur_cpu_spec->num_pmcs; ++i)
reset_value[i] = 0x80000000UL - ctr[i].count;
/* setup user and kernel profiling */
if (sys->enable_kernel)
mmcr0_val &= ~MMCR0_KERNEL_DISABLE;
else
mmcr0_val |= MMCR0_KERNEL_DISABLE;
if (sys->enable_user)
mmcr0_val &= ~MMCR0_PROBLEM_DISABLE;
else
mmcr0_val |= MMCR0_PROBLEM_DISABLE;
if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p) ||
__is_processor(PV_970) || __is_processor(PV_970FX) ||
__is_processor(PV_970MP) || __is_processor(PV_970GX) ||
__is_processor(PV_POWER5) || __is_processor(PV_POWER5p))
use_slot_nums = 1;
return 0;
}
extern void ppc_enable_pmcs(void);
/*
* Older CPUs require the MMCRA sample bit to be always set, but newer
* CPUs only want it set for some groups. Eventually we will remove all
* knowledge of this bit in the kernel, oprofile userspace should be
* setting it when required.
*
* In order to keep current installations working we force the bit for
* those older CPUs. Once everyone has updated their oprofile userspace we
* can remove this hack.
*/
static inline int mmcra_must_set_sample(void)
{
if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p) ||
__is_processor(PV_970) || __is_processor(PV_970FX) ||
__is_processor(PV_970MP) || __is_processor(PV_970GX))
return 1;
return 0;
}
static int power4_cpu_setup(struct op_counter_config *ctr)
{
unsigned int mmcr0 = mmcr0_val;
unsigned long mmcra = mmcra_val;
ppc_enable_pmcs();
/* set the freeze bit */
mmcr0 |= MMCR0_FC;
mtspr(SPRN_MMCR0, mmcr0);
mmcr0 |= MMCR0_FCM1|MMCR0_PMXE|MMCR0_FCECE;
mmcr0 |= MMCR0_PMC1CE|MMCR0_PMCjCE;
mtspr(SPRN_MMCR0, mmcr0);
mtspr(SPRN_MMCR1, mmcr1_val);
if (mmcra_must_set_sample())
mmcra |= MMCRA_SAMPLE_ENABLE;
mtspr(SPRN_MMCRA, mmcra);
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));
dbg("setup on cpu %d, mmcra %lx\n", smp_processor_id(),
mfspr(SPRN_MMCRA));
return 0;
}
static int power4_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 < cur_cpu_spec->num_pmcs; ++i) {
if (ctr[i].enabled) {
classic_ctr_write(i, reset_value[i]);
} else {
classic_ctr_write(i, 0);
}
}
mmcr0 = mfspr(SPRN_MMCR0);
/*
* We must clear the PMAO bit on some (GQ) chips. Just do it
* all the time
*/
mmcr0 &= ~MMCR0_PMAO;
/*
* 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);
oprofile_running = 1;
dbg("start on cpu %d, mmcr0 %x\n", smp_processor_id(), mmcr0);
return 0;
}
static void power4_stop(void)
{
unsigned int mmcr0;
/* freeze counters */
mmcr0 = mfspr(SPRN_MMCR0);
mmcr0 |= MMCR0_FC;
mtspr(SPRN_MMCR0, mmcr0);
oprofile_running = 0;
dbg("stop on cpu %d, mmcr0 %x\n", smp_processor_id(), mmcr0);
mb();
}
/* Fake functions used by canonicalize_pc */
static void __used hypervisor_bucket(void)
{
}
static void __used rtas_bucket(void)
{
}
static void __used kernel_unknown_bucket(void)
{
}
/*
* On GQ and newer the MMCRA stores the HV and PR bits at the time
* the SIAR was sampled. We use that to work out if the SIAR was sampled in
* the hypervisor, our exception vectors or RTAS.
* If the MMCRA_SAMPLE_ENABLE bit is set, we can use the MMCRA[slot] bits
* to more accurately identify the address of the sampled instruction. The
* mmcra[slot] bits represent the slot number of a sampled instruction
* within an instruction group. The slot will contain a value between 1
* and 5 if MMCRA_SAMPLE_ENABLE is set, otherwise 0.
*/
static unsigned long get_pc(struct pt_regs *regs)
{
unsigned long pc = mfspr(SPRN_SIAR);
unsigned long mmcra;
unsigned long slot;
/* Can't do much about it */
if (!cur_cpu_spec->oprofile_mmcra_sihv)
return pc;
mmcra = mfspr(SPRN_MMCRA);
if (use_slot_nums && (mmcra & MMCRA_SAMPLE_ENABLE)) {
slot = ((mmcra & MMCRA_SLOT) >> MMCRA_SLOT_SHIFT);
if (slot > 1)
pc += 4 * (slot - 1);
}
/* Were we in the hypervisor? */
if (firmware_has_feature(FW_FEATURE_LPAR) &&
(mmcra & cur_cpu_spec->oprofile_mmcra_sihv))
/* function descriptor madness */
return *((unsigned long *)hypervisor_bucket);
/* We were in userspace, nothing to do */
if (mmcra & cur_cpu_spec->oprofile_mmcra_sipr)
return pc;
#ifdef CONFIG_PPC_RTAS
/* Were we in RTAS? */
if (pc >= rtas.base && pc < (rtas.base + rtas.size))
/* function descriptor madness */
return *((unsigned long *)rtas_bucket);
#endif
/* Were we in our exception vectors or SLB real mode miss handler? */
if (pc < 0x1000000UL)
return (unsigned long)__va(pc);
/* Not sure where we were */
if (!is_kernel_addr(pc))
/* function descriptor madness */
return *((unsigned long *)kernel_unknown_bucket);
return pc;
}
static int get_kernel(unsigned long pc, unsigned long mmcra)
{
int is_kernel;
if (!cur_cpu_spec->oprofile_mmcra_sihv) {
is_kernel = is_kernel_addr(pc);
} else {
is_kernel = ((mmcra & cur_cpu_spec->oprofile_mmcra_sipr) == 0);
}
return is_kernel;
}
static bool pmc_overflow(unsigned long val)
{
if ((int)val < 0)
return true;
/*
* Events on POWER7 can roll back if a speculative event doesn't
* eventually complete. Unfortunately in some rare cases they will
* raise a performance monitor exception. We need to catch this to
* ensure we reset the PMC. In all cases the PMC will be 256 or less
* cycles from overflow.
*
* We only do this if the first pass fails to find any overflowing
* PMCs because a user might set a period of less than 256 and we
* don't want to mistakenly reset them.
*/
if (__is_processor(PV_POWER7) && ((0x80000000 - val) <= 256))
return true;
return false;
}
static void power4_handle_interrupt(struct pt_regs *regs,
struct op_counter_config *ctr)
{
unsigned long pc;
int is_kernel;
int val;
int i;
unsigned int mmcr0;
unsigned long mmcra;
mmcra = mfspr(SPRN_MMCRA);
pc = get_pc(regs);
is_kernel = get_kernel(pc, mmcra);
/* set the PMM bit (see comment below) */
mtmsrd(mfmsr() | MSR_PMM);
for (i = 0; i < cur_cpu_spec->num_pmcs; ++i) {
val = classic_ctr_read(i);
if (pmc_overflow(val)) {
if (oprofile_running && ctr[i].enabled) {
oprofile_add_ext_sample(pc, regs, i, is_kernel);
classic_ctr_write(i, reset_value[i]);
} else {
classic_ctr_write(i, 0);
}
}
}
mmcr0 = mfspr(SPRN_MMCR0);
/* reset the perfmon trigger */
mmcr0 |= MMCR0_PMXE;
/*
* We must clear the PMAO bit on some (GQ) chips. Just do it
* all the time
*/
mmcr0 &= ~MMCR0_PMAO;
/* Clear the appropriate bits in the MMCRA */
mmcra &= ~cur_cpu_spec->oprofile_mmcra_clear;
mtspr(SPRN_MMCRA, mmcra);
/*
* 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_power4 = {
.reg_setup = power4_reg_setup,
.cpu_setup = power4_cpu_setup,
.start = power4_start,
.stop = power4_stop,
.handle_interrupt = power4_handle_interrupt,
};