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