2707cd293c
Delay slot emulation in the FPU emulator is the only kernel user of an executable stack, it is also very slow. Add a counter so we can see how many of these emulations are done. Signed-off-by: David Daney <david.daney@cavium.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/8634/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
68 lines
1.6 KiB
C
68 lines
1.6 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/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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extern struct dentry *mips_debugfs_dir;
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static int __init debugfs_fpuemu(void)
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{
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struct dentry *d, *dir;
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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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#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(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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__initcall(debugfs_fpuemu);
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