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linux-next/arch/powerpc/oprofile/common.c
Carl Love 883823291d powerpc/oprofile: IBM CELL: add SPU event profiling support
This patch adds the SPU event based profiling funcitonality for the
IBM Cell processor.  Previously, the CELL OProfile kernel code supported
PPU event, PPU cycle profiling and SPU cycle profiling.   The addition of
SPU event profiling allows the users to identify where in their SPU code
various SPU evnets are occuring.  This should help users further identify
issues with their code.  Note, SPU profiling has some limitations due to HW
constraints.  Only one event at a time can be used for profiling and SPU event
profiling must be time sliced across all of the SPUs in a node.

The patch adds a new arch specific file to the OProfile file system. The
file has bit 0 set to indicate that the kernel supports SPU event profiling.
The user tool must check this file/bit to make sure the kernel supports
SPU event profiling before trying to do SPU event profiling.  The user tool
check is part of the user tool patch for SPU event profiling.

Signed-off-by: Carl Love <carll@us.ibm.com>
Signed-off-by: Robert Richter <robert.richter@amd.com>
2009-01-08 15:51:55 +01:00

255 lines
6.3 KiB
C

/*
* PPC 64 oprofile support:
* Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
* PPC 32 oprofile support: (based on PPC 64 support)
* Copyright (C) Freescale Semiconductor, Inc 2004
* Author: Andy Fleming
*
* Based on alpha version.
*
* 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 <linux/errno.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#include <asm/pmc.h>
#include <asm/cputable.h>
#include <asm/oprofile_impl.h>
#include <asm/firmware.h>
static struct op_powerpc_model *model;
static struct op_counter_config ctr[OP_MAX_COUNTER];
static struct op_system_config sys;
static int op_per_cpu_rc;
static void op_handle_interrupt(struct pt_regs *regs)
{
model->handle_interrupt(regs, ctr);
}
static void op_powerpc_cpu_setup(void *dummy)
{
int ret;
ret = model->cpu_setup(ctr);
if (ret != 0)
op_per_cpu_rc = ret;
}
static int op_powerpc_setup(void)
{
int err;
op_per_cpu_rc = 0;
/* Grab the hardware */
err = reserve_pmc_hardware(op_handle_interrupt);
if (err)
return err;
/* Pre-compute the values to stuff in the hardware registers. */
op_per_cpu_rc = model->reg_setup(ctr, &sys, model->num_counters);
if (op_per_cpu_rc)
goto out;
/* Configure the registers on all cpus. If an error occurs on one
* of the cpus, op_per_cpu_rc will be set to the error */
on_each_cpu(op_powerpc_cpu_setup, NULL, 1);
out: if (op_per_cpu_rc) {
/* error on setup release the performance counter hardware */
release_pmc_hardware();
}
return op_per_cpu_rc;
}
static void op_powerpc_shutdown(void)
{
release_pmc_hardware();
}
static void op_powerpc_cpu_start(void *dummy)
{
/* If any of the cpus have return an error, set the
* global flag to the error so it can be returned
* to the generic OProfile caller.
*/
int ret;
ret = model->start(ctr);
if (ret != 0)
op_per_cpu_rc = ret;
}
static int op_powerpc_start(void)
{
op_per_cpu_rc = 0;
if (model->global_start)
return model->global_start(ctr);
if (model->start) {
on_each_cpu(op_powerpc_cpu_start, NULL, 1);
return op_per_cpu_rc;
}
return -EIO; /* No start function is defined for this
power architecture */
}
static inline void op_powerpc_cpu_stop(void *dummy)
{
model->stop();
}
static void op_powerpc_stop(void)
{
if (model->stop)
on_each_cpu(op_powerpc_cpu_stop, NULL, 1);
if (model->global_stop)
model->global_stop();
}
static int op_powerpc_create_files(struct super_block *sb, struct dentry *root)
{
int i;
#ifdef CONFIG_PPC64
/*
* There is one mmcr0, mmcr1 and mmcra for setting the events for
* all of the counters.
*/
oprofilefs_create_ulong(sb, root, "mmcr0", &sys.mmcr0);
oprofilefs_create_ulong(sb, root, "mmcr1", &sys.mmcr1);
oprofilefs_create_ulong(sb, root, "mmcra", &sys.mmcra);
#ifdef CONFIG_OPROFILE_CELL
/* create a file the user tool can check to see what level of profiling
* support exits with this kernel. Initialize bit mask to indicate
* what support the kernel has:
* bit 0 - Supports SPU event profiling in addition to PPU
* event and cycles; and SPU cycle profiling
* bits 1-31 - Currently unused.
*
* If the file does not exist, then the kernel only supports SPU
* cycle profiling, PPU event and cycle profiling.
*/
oprofilefs_create_ulong(sb, root, "cell_support", &sys.cell_support);
sys.cell_support = 0x1; /* Note, the user OProfile tool must check
* that this bit is set before attempting to
* user SPU event profiling. Older kernels
* will not have this file, hence the user
* tool is not allowed to do SPU event
* profiling on older kernels. Older kernels
* will accept SPU events but collected data
* is garbage.
*/
#endif
#endif
for (i = 0; i < model->num_counters; ++i) {
struct dentry *dir;
char buf[4];
snprintf(buf, sizeof buf, "%d", i);
dir = oprofilefs_mkdir(sb, root, buf);
oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
/*
* Classic PowerPC doesn't support per-counter
* control like this, but the options are
* expected, so they remain. For Freescale
* Book-E style performance monitors, we do
* support them.
*/
oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
}
oprofilefs_create_ulong(sb, root, "enable_kernel", &sys.enable_kernel);
oprofilefs_create_ulong(sb, root, "enable_user", &sys.enable_user);
/* Default to tracing both kernel and user */
sys.enable_kernel = 1;
sys.enable_user = 1;
return 0;
}
int __init oprofile_arch_init(struct oprofile_operations *ops)
{
if (!cur_cpu_spec->oprofile_cpu_type)
return -ENODEV;
if (firmware_has_feature(FW_FEATURE_ISERIES))
return -ENODEV;
switch (cur_cpu_spec->oprofile_type) {
#ifdef CONFIG_PPC64
#ifdef CONFIG_OPROFILE_CELL
case PPC_OPROFILE_CELL:
if (firmware_has_feature(FW_FEATURE_LPAR))
return -ENODEV;
model = &op_model_cell;
ops->sync_start = model->sync_start;
ops->sync_stop = model->sync_stop;
break;
#endif
case PPC_OPROFILE_RS64:
model = &op_model_rs64;
break;
case PPC_OPROFILE_POWER4:
model = &op_model_power4;
break;
case PPC_OPROFILE_PA6T:
model = &op_model_pa6t;
break;
#endif
#ifdef CONFIG_6xx
case PPC_OPROFILE_G4:
model = &op_model_7450;
break;
#endif
#if defined(CONFIG_FSL_EMB_PERFMON)
case PPC_OPROFILE_FSL_EMB:
model = &op_model_fsl_emb;
break;
#endif
default:
return -ENODEV;
}
model->num_counters = cur_cpu_spec->num_pmcs;
ops->cpu_type = cur_cpu_spec->oprofile_cpu_type;
ops->create_files = op_powerpc_create_files;
ops->setup = op_powerpc_setup;
ops->shutdown = op_powerpc_shutdown;
ops->start = op_powerpc_start;
ops->stop = op_powerpc_stop;
ops->backtrace = op_powerpc_backtrace;
printk(KERN_DEBUG "oprofile: using %s performance monitoring.\n",
ops->cpu_type);
return 0;
}
void oprofile_arch_exit(void)
{
}