linux-kernel - Re: [PATCH V2 4/4] x86/perf: Assert all platform event flags are within PERF_EVENT_FLAG

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Date:   Wed, 7 Sep 2022 10:30:59 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        James Clark <james.clark@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH V2 4/4] x86/perf: Assert all platform event flags are
 within PERF_EVENT_FLAG_ARCH

On Wed, Sep 07, 2022 at 10:57:35AM +0530, Anshuman Khandual wrote:

> > How about something like so?
> 
> Makes sense, will fold this back. Could I also include your "Signed-off-by:"
> for this patch ?
> 

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>

> > 
> > ---
> > --- a/arch/x86/events/perf_event.h
> > +++ b/arch/x86/events/perf_event.h
> > @@ -64,27 +64,25 @@ static inline bool constraint_match(stru
> >  	return ((ecode & c->cmask) - c->code) <= (u64)c->size;
> >  }
> >  
> > +#define PERF_ARCH(name, val)	\
> > +	PERF_X86_EVENT_##name = val,
> > +
> >  /*
> >   * struct hw_perf_event.flags flags
> >   */
> > -#define PERF_X86_EVENT_PEBS_LDLAT	0x00001 /* ld+ldlat data address sampling */
> > -#define PERF_X86_EVENT_PEBS_ST		0x00002 /* st data address sampling */
> > -#define PERF_X86_EVENT_PEBS_ST_HSW	0x00004 /* haswell style datala, store */
> > -#define PERF_X86_EVENT_PEBS_LD_HSW	0x00008 /* haswell style datala, load */
> > -#define PERF_X86_EVENT_PEBS_NA_HSW	0x00010 /* haswell style datala, unknown */
> > -#define PERF_X86_EVENT_EXCL		0x00020 /* HT exclusivity on counter */
> > -#define PERF_X86_EVENT_DYNAMIC		0x00040 /* dynamic alloc'd constraint */
> > -
> > -#define PERF_X86_EVENT_EXCL_ACCT	0x00100 /* accounted EXCL event */
> > -#define PERF_X86_EVENT_AUTO_RELOAD	0x00200 /* use PEBS auto-reload */
> > -#define PERF_X86_EVENT_LARGE_PEBS	0x00400 /* use large PEBS */
> > -#define PERF_X86_EVENT_PEBS_VIA_PT	0x00800 /* use PT buffer for PEBS */
> > -#define PERF_X86_EVENT_PAIR		0x01000 /* Large Increment per Cycle */
> > -#define PERF_X86_EVENT_LBR_SELECT	0x02000 /* Save/Restore MSR_LBR_SELECT */
> > -#define PERF_X86_EVENT_TOPDOWN		0x04000 /* Count Topdown slots/metrics events */
> > -#define PERF_X86_EVENT_PEBS_STLAT	0x08000 /* st+stlat data address sampling */
> > -#define PERF_X86_EVENT_AMD_BRS		0x10000 /* AMD Branch Sampling */
> > -#define PERF_X86_EVENT_PEBS_LAT_HYBRID	0x20000 /* ld and st lat for hybrid */
> > +enum {
> > +#include "perf_event_flags.h"
> > +};
> > +
> > +#undef PERF_ARCH
> > +
> > +#define PERF_ARCH(name, val)						\
> > +	static_assert((PERF_X86_EVENT_##name & PERF_EVENT_FLAG_ARCH) ==	\
> > +		      PERF_X86_EVENT_##name);
> > +
> > +#include "perf_event_flags.h"
> > +
> > +#undef PERF_ARCH
> >  
> >  static inline bool is_topdown_count(struct perf_event *event)
> >  {
> > --- /dev/null
> > +++ b/arch/x86/events/perf_event_flags.h
> > @@ -0,0 +1,22 @@
> > +
> > +/*
> > + * struct hw_perf_event.flags flags
> > + */
> > +PERF_ARCH(PEBS_LDLAT,		0x00001) /* ld+ldlat data address sampling */
> > +PERF_ARCH(PEBS_ST,		0x00002) /* st data address sampling */
> > +PERF_ARCH(PEBS_ST_HSW,		0x00004) /* haswell style datala, store */
> > +PERF_ARCH(PEBS_LD_HSW,		0x00008) /* haswell style datala, load */
> > +PERF_ARCH(PEBS_NA_HSW,		0x00010) /* haswell style datala, unknown */
> > +PERF_ARCH(EXCL,			0x00020) /* HT exclusivity on counter */
> > +PERF_ARCH(DYNAMIC,		0x00040) /* dynamic alloc'd constraint */
> > +			/*	0x00080	*/
> > +PERF_ARCH(EXCL_ACCT,		0x00100) /* accounted EXCL event */
> > +PERF_ARCH(AUTO_RELOAD,		0x00200) /* use PEBS auto-reload */
> > +PERF_ARCH(LARGE_PEBS,		0x00400) /* use large PEBS */
> > +PERF_ARCH(PEBS_VIA_PT,		0x00800) /* use PT buffer for PEBS */
> > +PERF_ARCH(PAIR,			0x01000) /* Large Increment per Cycle */
> > +PERF_ARCH(LBR_SELECT,		0x02000) /* Save/Restore MSR_LBR_SELECT */
> > +PERF_ARCH(TOPDOWN,		0x04000) /* Count Topdown slots/metrics events */
> > +PERF_ARCH(PEBS_STLAT,		0x08000) /* st+stlat data address sampling */
> > +PERF_ARCH(AMD_BRS,		0x10000) /* AMD Branch Sampling */
> > +PERF_ARCH(PEBS_LAT_HYBRID,	0x20000) /* ld and st lat for hybrid */