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Commit 83fd38ca authored by Atsushi Nemoto's avatar Atsushi Nemoto Committed by Ralf Baechle
Browse files

[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: default avatarAtsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 6312e0ee

arch/mips/math-emu/cp1emu.c

+34 −0
Original line number Original line Diff line number Diff line
@@ -35,6 +35,7 @@ 
 * better performance by compiling with -msoft-float!

 * better performance by compiling with -msoft-float!

 */

 */

#include <linux/sched.h>

#include <linux/sched.h>

#include <linux/debugfs.h>





#include <asm/inst.h>

#include <asm/inst.h>

#include <asm/bootinfo.h>

#include <asm/bootinfo.h>
@@ -1277,3 +1278,36 @@ int fpu_emulator_cop1Handler(struct pt_regs *xcp, struct mips_fpu_struct *ctx, 




	return sig;

	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