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https://github.com/edk2-porting/linux-next.git
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25ad8db632
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>
106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
#include <linux/cpumask.h>
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#include <linux/debugfs.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/percpu.h>
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#include <linux/types.h>
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#include <asm/debug.h>
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#include <asm/fpu_emulator.h>
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#include <asm/local.h>
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DEFINE_PER_CPU(struct mips_fpu_emulator_stats, fpuemustats);
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static int fpuemu_stat_get(void *data, u64 *val)
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{
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int cpu;
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unsigned long sum = 0;
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for_each_online_cpu(cpu) {
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struct mips_fpu_emulator_stats *ps;
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local_t *pv;
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ps = &per_cpu(fpuemustats, cpu);
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pv = (void *)ps + (unsigned long)data;
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sum += local_read(pv);
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}
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*val = sum;
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return 0;
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}
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DEFINE_SIMPLE_ATTRIBUTE(fops_fpuemu_stat, fpuemu_stat_get, NULL, "%llu\n");
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static int fpuemustats_clear_show(struct seq_file *s, void *unused)
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{
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__this_cpu_write((fpuemustats).emulated, 0);
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__this_cpu_write((fpuemustats).loads, 0);
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__this_cpu_write((fpuemustats).stores, 0);
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__this_cpu_write((fpuemustats).branches, 0);
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__this_cpu_write((fpuemustats).cp1ops, 0);
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__this_cpu_write((fpuemustats).cp1xops, 0);
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__this_cpu_write((fpuemustats).errors, 0);
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__this_cpu_write((fpuemustats).ieee754_inexact, 0);
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__this_cpu_write((fpuemustats).ieee754_underflow, 0);
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__this_cpu_write((fpuemustats).ieee754_overflow, 0);
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__this_cpu_write((fpuemustats).ieee754_zerodiv, 0);
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__this_cpu_write((fpuemustats).ieee754_invalidop, 0);
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__this_cpu_write((fpuemustats).ds_emul, 0);
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return 0;
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}
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static int fpuemustats_clear_open(struct inode *inode, struct file *file)
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{
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return single_open(file, fpuemustats_clear_show, inode->i_private);
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}
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static const struct file_operations fpuemustats_clear_fops = {
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.open = fpuemustats_clear_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int __init debugfs_fpuemu(void)
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{
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struct dentry *d, *dir, *reset_file;
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if (!mips_debugfs_dir)
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return -ENODEV;
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dir = debugfs_create_dir("fpuemustats", mips_debugfs_dir);
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if (!dir)
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return -ENOMEM;
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reset_file = debugfs_create_file("fpuemustats_clear", 0444,
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mips_debugfs_dir, NULL,
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&fpuemustats_clear_fops);
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if (!reset_file)
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return -ENOMEM;
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#define FPU_EMU_STAT_OFFSET(m) \
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offsetof(struct mips_fpu_emulator_stats, m)
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#define FPU_STAT_CREATE(m) \
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do { \
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d = debugfs_create_file(#m , S_IRUGO, dir, \
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(void *)FPU_EMU_STAT_OFFSET(m), \
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&fops_fpuemu_stat); \
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if (!d) \
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return -ENOMEM; \
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} while (0)
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FPU_STAT_CREATE(emulated);
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FPU_STAT_CREATE(loads);
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FPU_STAT_CREATE(stores);
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FPU_STAT_CREATE(branches);
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FPU_STAT_CREATE(cp1ops);
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FPU_STAT_CREATE(cp1xops);
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FPU_STAT_CREATE(errors);
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FPU_STAT_CREATE(ieee754_inexact);
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FPU_STAT_CREATE(ieee754_underflow);
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FPU_STAT_CREATE(ieee754_overflow);
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FPU_STAT_CREATE(ieee754_zerodiv);
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FPU_STAT_CREATE(ieee754_invalidop);
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FPU_STAT_CREATE(ds_emul);
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return 0;
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}
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arch_initcall(debugfs_fpuemu);
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