diff options
| author | Aleksandar Markovic <aleksandar.markovic@imgtec.com> | 2017-08-21 14:24:51 +0200 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2017-08-29 15:21:57 +0200 |
| commit | 25ad8db632ec54c60daad9107ddf25a2a608a450 (patch) | |
| tree | 51efd0b8e1eb701820e6081dabeda8988bd610c4 /arch/mips/math-emu | |
| parent | ae5f3f5b81dd2c776f0ad49d6d121ce1255b35eb (diff) | |
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>
Diffstat (limited to 'arch/mips/math-emu')
| -rw-r--r-- | arch/mips/math-emu/me-debugfs.c | 38 |
1 files changed, 37 insertions, 1 deletions
diff --git a/arch/mips/math-emu/me-debugfs.c b/arch/mips/math-emu/me-debugfs.c index 78b26c8dc697..f080493ba743 100644 --- a/arch/mips/math-emu/me-debugfs.c +++ b/arch/mips/math-emu/me-debugfs.c @@ -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"); +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) { - struct dentry *d, *dir; + struct dentry *d, *dir, *reset_file; if (!mips_debugfs_dir) return -ENODEV; dir = debugfs_create_dir("fpuemustats", mips_debugfs_dir); if (!dir) 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) \ offsetof(struct mips_fpu_emulator_stats, m) |