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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: Miodrag Dinic <miodrag.dinic@imgtec.com>
Signed-off-by: Goran Ferenc <goran.ferenc@imgtec.com>
Signed-off-by: Aleksandar 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: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Aleksandar Markovic 2017-08-21 14:24:51 +02:00 committed by Ralf Baechle
parent ae5f3f5b81
commit 25ad8db632
1 changed files with 37 additions and 1 deletions
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38
arch/mips/math-emu/me-debugfs.c
View File

@ -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)