mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 12:24:54 +07:00
d1898b7336
I've been carrying this patch around for a bit and it's helped me solve at least a couple FPU-related bugs. In addition to using it for debugging, I also drug it out because using AVX (and AVX2/AVX-512) can have serious power consequences for a modern core. It's very important to be able to figure out who is using it. It's also insanely useful to go out and see who is using a given feature, like MPX or Memory Protection Keys. If you, for instance, want to find all processes using protection keys, you can do: echo 'xfeatures & 0x200' > filter Since 0x200 is the protection keys feature bit. Note that this touches the KVM code. KVM did a CREATE_TRACE_POINTS and then included a bunch of random headers. If anyone one of those included other tracepoints, it would have defined the *OTHER* tracepoints. That's bogus, so move it to the right place. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave@sr71.net> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20160601174220.3CDFB90E@viggo.jf.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
120 lines
2.4 KiB
C
120 lines
2.4 KiB
C
#undef TRACE_SYSTEM
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#define TRACE_SYSTEM x86_fpu
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#if !defined(_TRACE_FPU_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_FPU_H
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#include <linux/tracepoint.h>
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DECLARE_EVENT_CLASS(x86_fpu,
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TP_PROTO(struct fpu *fpu),
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TP_ARGS(fpu),
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TP_STRUCT__entry(
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__field(struct fpu *, fpu)
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__field(bool, fpregs_active)
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__field(bool, fpstate_active)
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__field(int, counter)
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__field(u64, xfeatures)
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__field(u64, xcomp_bv)
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),
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TP_fast_assign(
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__entry->fpu = fpu;
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__entry->fpregs_active = fpu->fpregs_active;
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__entry->fpstate_active = fpu->fpstate_active;
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__entry->counter = fpu->counter;
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if (boot_cpu_has(X86_FEATURE_OSXSAVE)) {
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__entry->xfeatures = fpu->state.xsave.header.xfeatures;
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__entry->xcomp_bv = fpu->state.xsave.header.xcomp_bv;
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}
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),
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TP_printk("x86/fpu: %p fpregs_active: %d fpstate_active: %d counter: %d xfeatures: %llx xcomp_bv: %llx",
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__entry->fpu,
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__entry->fpregs_active,
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__entry->fpstate_active,
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__entry->counter,
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__entry->xfeatures,
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__entry->xcomp_bv
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)
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);
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DEFINE_EVENT(x86_fpu, x86_fpu_state,
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TP_PROTO(struct fpu *fpu),
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TP_ARGS(fpu)
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);
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DEFINE_EVENT(x86_fpu, x86_fpu_before_save,
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TP_PROTO(struct fpu *fpu),
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TP_ARGS(fpu)
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);
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DEFINE_EVENT(x86_fpu, x86_fpu_after_save,
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TP_PROTO(struct fpu *fpu),
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TP_ARGS(fpu)
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);
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DEFINE_EVENT(x86_fpu, x86_fpu_before_restore,
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TP_PROTO(struct fpu *fpu),
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TP_ARGS(fpu)
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);
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DEFINE_EVENT(x86_fpu, x86_fpu_after_restore,
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TP_PROTO(struct fpu *fpu),
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TP_ARGS(fpu)
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);
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DEFINE_EVENT(x86_fpu, x86_fpu_regs_activated,
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TP_PROTO(struct fpu *fpu),
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TP_ARGS(fpu)
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);
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DEFINE_EVENT(x86_fpu, x86_fpu_regs_deactivated,
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TP_PROTO(struct fpu *fpu),
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TP_ARGS(fpu)
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);
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DEFINE_EVENT(x86_fpu, x86_fpu_activate_state,
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TP_PROTO(struct fpu *fpu),
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TP_ARGS(fpu)
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);
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DEFINE_EVENT(x86_fpu, x86_fpu_deactivate_state,
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TP_PROTO(struct fpu *fpu),
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TP_ARGS(fpu)
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);
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DEFINE_EVENT(x86_fpu, x86_fpu_init_state,
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TP_PROTO(struct fpu *fpu),
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TP_ARGS(fpu)
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);
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DEFINE_EVENT(x86_fpu, x86_fpu_dropped,
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TP_PROTO(struct fpu *fpu),
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TP_ARGS(fpu)
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);
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DEFINE_EVENT(x86_fpu, x86_fpu_copy_src,
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TP_PROTO(struct fpu *fpu),
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TP_ARGS(fpu)
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);
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DEFINE_EVENT(x86_fpu, x86_fpu_copy_dst,
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TP_PROTO(struct fpu *fpu),
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TP_ARGS(fpu)
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);
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DEFINE_EVENT(x86_fpu, x86_fpu_xstate_check_failed,
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TP_PROTO(struct fpu *fpu),
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TP_ARGS(fpu)
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);
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#undef TRACE_INCLUDE_PATH
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#define TRACE_INCLUDE_PATH asm/trace/
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#undef TRACE_INCLUDE_FILE
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#define TRACE_INCLUDE_FILE fpu
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#endif /* _TRACE_FPU_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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