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

@@ -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

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();
+}

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 */