[MIPS] Add debugfs files to show fpuemu statistics

Export contents of struct mips_fpu_emulator_stats via debugfs.

There is no way to read these statistics for now but they (at least
the "emulated" count) might be sometimes useful for performance tuning
on FPU-less CPUs.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 34 insertions, 0 deletions

diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
index 80531b35cd61..d7f05b0abe17 100644
--- a/arch/mips/math-emu/cp1emu.c
+++ b/arch/mips/math-emu/cp1emu.c
@@ -35,6 +35,7 @@
  * better performance by compiling with -msoft-float!
  */
 #include <linux/sched.h>
+#include <linux/debugfs.h>
 
 #include <asm/inst.h>
 #include <asm/bootinfo.h>
@@ -1277,3 +1278,36 @@ int fpu_emulator_cop1Handler(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
 
         return sig;
 }
+
+#ifdef CONFIG_DEBUG_FS
+extern struct dentry *mips_debugfs_dir;
+static int __init debugfs_fpuemu(void)
+{
+        struct dentry *d, *dir;
+        int i;
+        static struct {
+                const char *name;
+                unsigned int *v;
+        } vars[] __initdata = {
+                { "emulated", &fpuemustats.emulated },
+                { "loads",    &fpuemustats.loads },
+                { "stores",   &fpuemustats.stores },
+                { "cp1ops",   &fpuemustats.cp1ops },
+                { "cp1xops",  &fpuemustats.cp1xops },
+                { "errors",   &fpuemustats.errors },
+        };
+
+        if (!mips_debugfs_dir)
+                return -ENODEV;
+        dir = debugfs_create_dir("fpuemustats", mips_debugfs_dir);
+        if (IS_ERR(dir))
+                return PTR_ERR(dir);
+        for (i = 0; i < ARRAY_SIZE(vars); i++) {
+                d = debugfs_create_u32(vars[i].name, S_IRUGO, dir, vars[i].v);
+                if (IS_ERR(d))
+                        return PTR_ERR(d);
+        }
+        return 0;
+}
+__initcall(debugfs_fpuemu);
+#endif