sh: oprofile: Refactor common setup code for multiple driver support.
Paul Mundt [Tue, 16 Dec 2008 00:33:53 +0000 (09:33 +0900)]
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
arch/sh/oprofile/common.c [new file with mode: 0644]
arch/sh/oprofile/op_impl.h [new file with mode: 0644]
arch/sh/oprofile/op_model_null.c [deleted file]

index 3d48f27..8e6eec9 100644 (file)
@@ -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 (file)
index 0000000..a4d8c0c
--- /dev/null
@@ -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 (file)
index 0000000..4d50997
--- /dev/null
@@ -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 (file)
index a845b08..0000000
+++ /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)
-{
-}
-