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Commit 25ad8db6 authored by Aleksandar Markovic's avatar Aleksandar Markovic Committed by Ralf Baechle
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MIPS: math-emu: Add FP emu debugfs clear functionality 



Add capability for the user to clear all FP emu debugfs counters.

This is achieved by having a special debugfs file "fpuemustats_clear"
(under default location "/sys/kernel/debug/mips"). Each access to the
file results in setting all counters to zero (it is enough, let's say,
to issue a "cat /sys/kernel/debug/mips/fpuemustats_clear").

This functionality already exists for R2 emulation statistics,
but was missing for FP emulation statistics. The implementation in
this patch is consistent with its R2 emulation counterpart.

Signed-off-by: default avatarMiodrag Dinic <miodrag.dinic@imgtec.com>
Signed-off-by: default avatarGoran Ferenc <goran.ferenc@imgtec.com>
Signed-off-by: default avatarAleksandar Markovic <aleksandar.markovic@imgtec.com>
Cc: Douglas Leung <douglas.leung@imgtec.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Petar Jovanovic <petar.jovanovic@imgtec.com>
Cc: Raghu Gandham <raghu.gandham@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/17144/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent ae5f3f5b

arch/mips/math-emu/me-debugfs.c

+37 −1
Original line number Original line Diff line number Diff line
@@ -28,15 +28,51 @@ static int fpuemu_stat_get(void *data, u64 *val) 
}

}

DEFINE_SIMPLE_ATTRIBUTE(fops_fpuemu_stat, fpuemu_stat_get, NULL, "%llu\n");

DEFINE_SIMPLE_ATTRIBUTE(fops_fpuemu_stat, fpuemu_stat_get, NULL, "%llu\n");





static int fpuemustats_clear_show(struct seq_file *s, void *unused)

{

	__this_cpu_write((fpuemustats).emulated, 0);

	__this_cpu_write((fpuemustats).loads, 0);

	__this_cpu_write((fpuemustats).stores, 0);

	__this_cpu_write((fpuemustats).branches, 0);

	__this_cpu_write((fpuemustats).cp1ops, 0);

	__this_cpu_write((fpuemustats).cp1xops, 0);

	__this_cpu_write((fpuemustats).errors, 0);

	__this_cpu_write((fpuemustats).ieee754_inexact, 0);

	__this_cpu_write((fpuemustats).ieee754_underflow, 0);

	__this_cpu_write((fpuemustats).ieee754_overflow, 0);

	__this_cpu_write((fpuemustats).ieee754_zerodiv, 0);

	__this_cpu_write((fpuemustats).ieee754_invalidop, 0);

	__this_cpu_write((fpuemustats).ds_emul, 0);



	return 0;

}



static int fpuemustats_clear_open(struct inode *inode, struct file *file)

{

	return single_open(file, fpuemustats_clear_show, inode->i_private);

}



static const struct file_operations fpuemustats_clear_fops = {

	.open                   = fpuemustats_clear_open,

	.read			= seq_read,

	.llseek			= seq_lseek,

	.release		= single_release,

};



static int __init debugfs_fpuemu(void)

static int __init debugfs_fpuemu(void)

{

{

	struct dentry *d, *dir;

	struct dentry *d, *dir, *reset_file;





	if (!mips_debugfs_dir)

	if (!mips_debugfs_dir)

		return -ENODEV;

		return -ENODEV;

	dir = debugfs_create_dir("fpuemustats", mips_debugfs_dir);

	dir = debugfs_create_dir("fpuemustats", mips_debugfs_dir);

	if (!dir)

	if (!dir)

		return -ENOMEM;

		return -ENOMEM;

	reset_file = debugfs_create_file("fpuemustats_clear", 0444,

					 mips_debugfs_dir, NULL,

					 &fpuemustats_clear_fops);

	if (!reset_file)

		return -ENOMEM;





#define FPU_EMU_STAT_OFFSET(m)						\

#define FPU_EMU_STAT_OFFSET(m)						\

	offsetof(struct mips_fpu_emulator_stats, m)

	offsetof(struct mips_fpu_emulator_stats, m)