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@xxxxxxxxxxxxx>
---
This patch can be applied to linux-queue tree.
arch/mips/math-emu/cp1emu.c | 34 ++++++++++++++++++++++++++++++++++
1 files changed, 34 insertions(+), 0 deletions(-)
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
index 80531b3..d7f05b0 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
