From 60a51fbe5dd2baef0f35bcf79f25ac1ee239a660 Mon Sep 17 00:00:00 2001
From: Paul Mundt <lethal@linux-sh.org>
Date: Tue, 16 Dec 2008 09:33:53 +0900
Subject: [PATCH] sh: oprofile: Refactor common setup code for multiple driver
support.
This re-implements the old op_model_null code in to something more
generic, where multiple drivers, backtrace, etc. can all be interfaced.
Based largely on arch/mips/oprofile/common.c.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
---
arch/sh/oprofile/Makefile | 11 +--
arch/sh/oprofile/common.c | 141 +++++++++++++++++++++++++++++++
arch/sh/oprofile/op_impl.h | 33 ++++++++
arch/sh/oprofile/op_model_null.c | 23 -----
4 files changed, 178 insertions(+), 30 deletions(-)
create mode 100644 arch/sh/oprofile/common.c
create mode 100644 arch/sh/oprofile/op_impl.h
delete mode 100644 arch/sh/oprofile/op_model_null.c
diff --git a/arch/sh/oprofile/Makefile b/arch/sh/oprofile/Makefile
index 3d48f2721287..8e6eec91c14c 100644
--- a/arch/sh/oprofile/Makefile
+++ b/arch/sh/oprofile/Makefile
@@ -6,11 +6,8 @@ DRIVER_OBJS = $(addprefix ../../../drivers/oprofile/, \
oprofilefs.o oprofile_stats.o \
timer_int.o )
-profdrvr-y := op_model_null.o
+oprofile-y := $(DRIVER_OBJS) common.o backtrace.o
-# SH7750-style performance counters exist across 7750/7750S and 7091.
-profdrvr-$(CONFIG_CPU_SUBTYPE_SH7750S) := op_model_sh7750.o
-profdrvr-$(CONFIG_CPU_SUBTYPE_SH7750) := op_model_sh7750.o
-profdrvr-$(CONFIG_CPU_SUBTYPE_SH7091) := op_model_sh7750.o
-
-oprofile-y := $(DRIVER_OBJS) $(profdrvr-y)
+oprofile-$(CONFIG_CPU_SUBTYPE_SH7750S) += op_model_sh7750.o
+oprofile-$(CONFIG_CPU_SUBTYPE_SH7750) += op_model_sh7750.o
+oprofile-$(CONFIG_CPU_SUBTYPE_SH7091) += op_model_sh7750.o
diff --git a/arch/sh/oprofile/common.c b/arch/sh/oprofile/common.c
new file mode 100644
index 000000000000..a4d8c0c9a63c
--- /dev/null
+++ b/arch/sh/oprofile/common.c
@@ -0,0 +1,141 @@
+/*
+ * arch/sh/oprofile/init.c
+ *
+ * Copyright (C) 2003 - 2008 Paul Mundt
+ *
+ * Based on arch/mips/oprofile/common.c:
+ *
+ * Copyright (C) 2004, 2005 Ralf Baechle
+ * Copyright (C) 2005 MIPS Technologies, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/kernel.h>
+#include <linux/oprofile.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/smp.h>
+#include <asm/processor.h>
+#include "op_impl.h"
+
+extern struct op_sh_model op_model_sh7750_ops __weak;
+extern struct op_sh_model op_model_sh4a_ops __weak;
+
+static struct op_sh_model *model;
+
+static struct op_counter_config ctr[20];
+
+static int op_sh_setup(void)
+{
+ /* Pre-compute the values to stuff in the hardware registers. */
+ model->reg_setup(ctr);
+
+ /* Configure the registers on all cpus. */
+ on_each_cpu(model->cpu_setup, NULL, 1);
+
+ return 0;
+}
+
+static int op_sh_create_files(struct super_block *sb, struct dentry *root)
+{
+ int i, ret = 0;
+
+ 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);
+
+ ret |= oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
+ ret |= oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
+ ret |= oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
+ ret |= oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
+
+ if (model->create_files)
+ ret |= model->create_files(sb, dir);
+ else
+ ret |= oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
+
+ /* Dummy entries */
+ ret |= oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
+ }
+
+ return ret;
+}
+
+static int op_sh_start(void)
+{
+ /* Enable performance monitoring for all counters. */
+ on_each_cpu(model->cpu_start, NULL, 1);
+
+ return 0;
+}
+
+static void op_sh_stop(void)
+{
+ /* Disable performance monitoring for all counters. */
+ on_each_cpu(model->cpu_stop, NULL, 1);
+}
+
+int __init oprofile_arch_init(struct oprofile_operations *ops)
+{
+ struct op_sh_model *lmodel = NULL;
+ int ret;
+
+ switch (current_cpu_data.type) {
+ /* SH-4 types */
+ case CPU_SH7750:
+ case CPU_SH7750S:
+ lmodel = &op_model_sh7750_ops;
+ break;
+
+ /* SH-4A types */
+ case CPU_SH7763:
+ case CPU_SH7770:
+ case CPU_SH7780:
+ case CPU_SH7781:
+ case CPU_SH7785:
+ case CPU_SH7723:
+ case CPU_SHX3:
+ lmodel = &op_model_sh4a_ops;
+ break;
+
+ /* SH4AL-DSP types */
+ case CPU_SH7343:
+ case CPU_SH7722:
+ case CPU_SH7366:
+ lmodel = &op_model_sh4a_ops;
+ break;
+ }
+
+ if (!lmodel)
+ return -ENODEV;
+ if (!(current_cpu_data.flags & CPU_HAS_PERF_COUNTER))
+ return -ENODEV;
+
+ ret = lmodel->init();
+ if (unlikely(ret != 0))
+ return ret;
+
+ model = lmodel;
+
+ ops->setup = op_sh_setup;
+ ops->create_files = op_sh_create_files;
+ ops->start = op_sh_start;
+ ops->stop = op_sh_stop;
+ ops->cpu_type = lmodel->cpu_type;
+
+ printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
+ lmodel->cpu_type);
+
+ return 0;
+}
+
+void oprofile_arch_exit(void)
+{
+ if (model && model->exit)
+ model->exit();
+}
diff --git a/arch/sh/oprofile/op_impl.h b/arch/sh/oprofile/op_impl.h
new file mode 100644
index 000000000000..4d509975eba6
--- /dev/null
+++ b/arch/sh/oprofile/op_impl.h
@@ -0,0 +1,33 @@
+#ifndef __OP_IMPL_H
+#define __OP_IMPL_H
+
+/* Per-counter configuration as set via oprofilefs. */
+struct op_counter_config {
+ unsigned long enabled;
+ unsigned long event;
+
+ unsigned long long count;
+
+ /* Dummy values for userspace tool compliance */
+ unsigned long kernel;
+ unsigned long user;
+ unsigned long unit_mask;
+};
+
+/* Per-architecture configury and hooks. */
+struct op_sh_model {
+ void (*reg_setup)(struct op_counter_config *);
+ int (*create_files)(struct super_block *sb, struct dentry *dir);
+ void (*cpu_setup)(void *dummy);
+ int (*init)(void);
+ void (*exit)(void);
+ void (*cpu_start)(void *args);
+ void (*cpu_stop)(void *args);
+ char *cpu_type;
+ unsigned char num_counters;
+};
+
+/* arch/sh/oprofile/common.c */
+extern void sh_backtrace(struct pt_regs * const regs, unsigned int depth);
+
+#endif /* __OP_IMPL_H */
diff --git a/arch/sh/oprofile/op_model_null.c b/arch/sh/oprofile/op_model_null.c
deleted file mode 100644
index a845b088edb4..000000000000
--- a/arch/sh/oprofile/op_model_null.c
+++ /dev/null
@@ -1,23 +0,0 @@
-/*
- * arch/sh/oprofile/op_model_null.c
- *
- * Copyright (C) 2003 Paul Mundt
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- */
-#include <linux/kernel.h>
-#include <linux/oprofile.h>
-#include <linux/init.h>
-#include <linux/errno.h>
-
-int __init oprofile_arch_init(struct oprofile_operations *ops)
-{
- return -ENODEV;
-}
-
-void oprofile_arch_exit(void)
-{
-}
-
--
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