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Re: [tip:perf/core] perf/x86/intel/rapl: Sanitize the quirk handling

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  Re: [tip:perf/core] perf/x86/intel/rapl: Sanitize the quirk handling Borislav Petkov <bp@alien8.de> - 2016-03-04 18:50 +0100
    Re: [tip:perf/core] perf/x86/intel/rapl: Sanitize the quirk handling Ingo Molnar <mingo@kernel.org> - 2016-03-08 17:10 +0100
      [PATCH] perf/x86/intel/rapl: Simplify quirk handling even more Borislav Petkov <bp@alien8.de> - 2016-03-08 17:50 +0100
        [tip:perf/core] perf/x86/intel/rapl: Simplify quirk handling even  more tip-bot for Borislav Petkov <tipbot@zytor.com> - 2016-03-08 18:40 +0100

#1350473 — Re: [tip:perf/core] perf/x86/intel/rapl: Sanitize the quirk handling

On Mon, Feb 29, 2016 at 03:10:28AM -0800, tip-bot for Thomas Gleixner wrote:
> Commit-ID:  b8b3319a471b2df35ae0a8fe94223638468e9ca4
> Gitweb:     http://git.kernel.org/tip/b8b3319a471b2df35ae0a8fe94223638468e9ca4
> Author:     Thomas Gleixner <tglx@linutronix.de>
> AuthorDate: Mon, 22 Feb 2016 22:19:22 +0000
> Committer:  Ingo Molnar <mingo@kernel.org>
> CommitDate: Mon, 29 Feb 2016 09:35:22 +0100
> 
> perf/x86/intel/rapl: Sanitize the quirk handling
> 
> There is no point in having a quirk machinery for a single possible
> function. Get rid of it and move the quirk to a place where it actually
> makes sense.

I guess you can simplify this even more by even getting rid of that
quirk function pointer funkyness and simply tell rapl_check_hw_unit() to
apply the quirk.

Diff ontop of yours:

---
diff --git a/arch/x86/events/intel/rapl.c b/arch/x86/events/intel/rapl.c
index 019e541fa988..0b72976bab35 100644
--- a/arch/x86/events/intel/rapl.c
+++ b/arch/x86/events/intel/rapl.c
@@ -592,18 +592,7 @@ static int rapl_cpu_notifier(struct notifier_block *self,
 	return NOTIFY_OK;
 }
 
-static __init void rapl_hsw_server_quirk(void)
-{
-	/*
-	 * DRAM domain on HSW server has fixed energy unit which can be
-	 * different than the unit from power unit MSR.
-	 * "Intel Xeon Processor E5-1600 and E5-2600 v3 Product Families, V2
-	 * of 2. Datasheet, September 2014, Reference Number: 330784-001 "
-	 */
-	rapl_hw_unit[RAPL_IDX_RAM_NRG_STAT] = 16;
-}
-
-static int rapl_check_hw_unit(void (*quirk)(void))
+static int rapl_check_hw_unit(bool apply_quirk)
 {
 	u64 msr_rapl_power_unit_bits;
 	int i;
@@ -614,9 +603,14 @@ static int rapl_check_hw_unit(void (*quirk)(void))
 	for (i = 0; i < NR_RAPL_DOMAINS; i++)
 		rapl_hw_unit[i] = (msr_rapl_power_unit_bits >> 8) & 0x1FULL;
 
-	/* Apply cpu model quirk */
-	if (quirk)
-		quirk();
+	/*
+	 * DRAM domain on HSW server has fixed energy unit which can be
+	 * different than the unit from power unit MSR.
+	 * "Intel Xeon Processor E5-1600 and E5-2600 v3 Product Families, V2
+	 * of 2. Datasheet, September 2014, Reference Number: 330784-001 "
+	 */
+	if (apply_quirk)
+		rapl_hw_unit[RAPL_IDX_RAM_NRG_STAT] = 16;
 
 	/*
 	 * Calculate the timer rate:
@@ -704,7 +698,7 @@ static const struct x86_cpu_id rapl_cpu_match[] __initconst = {
 
 static int __init rapl_pmu_init(void)
 {
-	void (*quirk)(void) = NULL;
+	bool apply_quirk = false;
 	int ret;
 
 	if (!x86_match_cpu(rapl_cpu_match))
@@ -717,7 +711,7 @@ static int __init rapl_pmu_init(void)
 		rapl_pmu_events_group.attrs = rapl_events_cln_attr;
 		break;
 	case 63: /* Haswell-Server */
-		quirk = rapl_hsw_server_quirk;
+		apply_quirk = true;
 		rapl_cntr_mask = RAPL_IDX_SRV;
 		rapl_pmu_events_group.attrs = rapl_events_srv_attr;
 		break;
@@ -733,7 +727,7 @@ static int __init rapl_pmu_init(void)
 		rapl_pmu_events_group.attrs = rapl_events_srv_attr;
 		break;
 	case 87: /* Knights Landing */
-		quirk = rapl_hsw_server_quirk;
+		apply_quirk = true;
 		rapl_cntr_mask = RAPL_IDX_KNL;
 		rapl_pmu_events_group.attrs = rapl_events_knl_attr;
 		break;
@@ -741,7 +735,7 @@ static int __init rapl_pmu_init(void)
 		return -ENODEV;
 	}
 
-	ret = rapl_check_hw_unit(quirk);
+	ret = rapl_check_hw_unit(apply_quirk);
 	if (ret)
 		return ret;
 
-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.

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#1353176

* Borislav Petkov <bp@alien8.de> wrote:

> On Mon, Feb 29, 2016 at 03:10:28AM -0800, tip-bot for Thomas Gleixner wrote:
> > Commit-ID:  b8b3319a471b2df35ae0a8fe94223638468e9ca4
> > Gitweb:     http://git.kernel.org/tip/b8b3319a471b2df35ae0a8fe94223638468e9ca4
> > Author:     Thomas Gleixner <tglx@linutronix.de>
> > AuthorDate: Mon, 22 Feb 2016 22:19:22 +0000
> > Committer:  Ingo Molnar <mingo@kernel.org>
> > CommitDate: Mon, 29 Feb 2016 09:35:22 +0100
> > 
> > perf/x86/intel/rapl: Sanitize the quirk handling
> > 
> > There is no point in having a quirk machinery for a single possible
> > function. Get rid of it and move the quirk to a place where it actually
> > makes sense.
> 
> I guess you can simplify this even more by even getting rid of that
> quirk function pointer funkyness and simply tell rapl_check_hw_unit() to
> apply the quirk.
> 
> Diff ontop of yours:
> 
> ---
> diff --git a/arch/x86/events/intel/rapl.c b/arch/x86/events/intel/rapl.c
> index 019e541fa988..0b72976bab35 100644
> --- a/arch/x86/events/intel/rapl.c
> +++ b/arch/x86/events/intel/rapl.c
> @@ -592,18 +592,7 @@ static int rapl_cpu_notifier(struct notifier_block *self,
>  	return NOTIFY_OK;
>  }
>  
> -static __init void rapl_hsw_server_quirk(void)
> -{
> -	/*
> -	 * DRAM domain on HSW server has fixed energy unit which can be
> -	 * different than the unit from power unit MSR.
> -	 * "Intel Xeon Processor E5-1600 and E5-2600 v3 Product Families, V2
> -	 * of 2. Datasheet, September 2014, Reference Number: 330784-001 "
> -	 */
> -	rapl_hw_unit[RAPL_IDX_RAM_NRG_STAT] = 16;
> -}
> -
> -static int rapl_check_hw_unit(void (*quirk)(void))
> +static int rapl_check_hw_unit(bool apply_quirk)
>  {
>  	u64 msr_rapl_power_unit_bits;
>  	int i;
> @@ -614,9 +603,14 @@ static int rapl_check_hw_unit(void (*quirk)(void))
>  	for (i = 0; i < NR_RAPL_DOMAINS; i++)
>  		rapl_hw_unit[i] = (msr_rapl_power_unit_bits >> 8) & 0x1FULL;
>  
> -	/* Apply cpu model quirk */
> -	if (quirk)
> -		quirk();
> +	/*
> +	 * DRAM domain on HSW server has fixed energy unit which can be
> +	 * different than the unit from power unit MSR.
> +	 * "Intel Xeon Processor E5-1600 and E5-2600 v3 Product Families, V2
> +	 * of 2. Datasheet, September 2014, Reference Number: 330784-001 "
> +	 */
> +	if (apply_quirk)
> +		rapl_hw_unit[RAPL_IDX_RAM_NRG_STAT] = 16;
>  
>  	/*
>  	 * Calculate the timer rate:
> @@ -704,7 +698,7 @@ static const struct x86_cpu_id rapl_cpu_match[] __initconst = {
>  
>  static int __init rapl_pmu_init(void)
>  {
> -	void (*quirk)(void) = NULL;
> +	bool apply_quirk = false;
>  	int ret;
>  
>  	if (!x86_match_cpu(rapl_cpu_match))
> @@ -717,7 +711,7 @@ static int __init rapl_pmu_init(void)
>  		rapl_pmu_events_group.attrs = rapl_events_cln_attr;
>  		break;
>  	case 63: /* Haswell-Server */
> -		quirk = rapl_hsw_server_quirk;
> +		apply_quirk = true;
>  		rapl_cntr_mask = RAPL_IDX_SRV;
>  		rapl_pmu_events_group.attrs = rapl_events_srv_attr;
>  		break;
> @@ -733,7 +727,7 @@ static int __init rapl_pmu_init(void)
>  		rapl_pmu_events_group.attrs = rapl_events_srv_attr;
>  		break;
>  	case 87: /* Knights Landing */
> -		quirk = rapl_hsw_server_quirk;
> +		apply_quirk = true;
>  		rapl_cntr_mask = RAPL_IDX_KNL;
>  		rapl_pmu_events_group.attrs = rapl_events_knl_attr;
>  		break;
> @@ -741,7 +735,7 @@ static int __init rapl_pmu_init(void)
>  		return -ENODEV;
>  	}
>  
> -	ret = rapl_check_hw_unit(quirk);
> +	ret = rapl_check_hw_unit(apply_quirk);
>  	if (ret)
>  		return ret;

Please send a patch with a changelog so it can be applied.

Thanks!

	Ingo

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#1353209 — [PATCH] perf/x86/intel/rapl: Simplify quirk handling even more

Drop the quirk() function pointer in favor of a simple boolean which
says whether the quirk should be applied or not. Update comment while at
it.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Harish Chegondi <harish.chegondi@intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
---
 arch/x86/events/intel/rapl.c | 32 +++++++++++++-------------------
 1 file changed, 13 insertions(+), 19 deletions(-)

diff --git a/arch/x86/events/intel/rapl.c b/arch/x86/events/intel/rapl.c
index 019e541fa988..b834a3f55a01 100644
--- a/arch/x86/events/intel/rapl.c
+++ b/arch/x86/events/intel/rapl.c
@@ -592,18 +592,7 @@ static int rapl_cpu_notifier(struct notifier_block *self,
 	return NOTIFY_OK;
 }
 
-static __init void rapl_hsw_server_quirk(void)
-{
-	/*
-	 * DRAM domain on HSW server has fixed energy unit which can be
-	 * different than the unit from power unit MSR.
-	 * "Intel Xeon Processor E5-1600 and E5-2600 v3 Product Families, V2
-	 * of 2. Datasheet, September 2014, Reference Number: 330784-001 "
-	 */
-	rapl_hw_unit[RAPL_IDX_RAM_NRG_STAT] = 16;
-}
-
-static int rapl_check_hw_unit(void (*quirk)(void))
+static int rapl_check_hw_unit(bool apply_quirk)
 {
 	u64 msr_rapl_power_unit_bits;
 	int i;
@@ -614,9 +603,14 @@ static int rapl_check_hw_unit(void (*quirk)(void))
 	for (i = 0; i < NR_RAPL_DOMAINS; i++)
 		rapl_hw_unit[i] = (msr_rapl_power_unit_bits >> 8) & 0x1FULL;
 
-	/* Apply cpu model quirk */
-	if (quirk)
-		quirk();
+	/*
+	 * DRAM domain on HSW server and KNL has fixed energy unit which can be
+	 * different than the unit from power unit MSR. See
+	 * "Intel Xeon Processor E5-1600 and E5-2600 v3 Product Families, V2
+	 * of 2. Datasheet, September 2014, Reference Number: 330784-001 "
+	 */
+	if (apply_quirk)
+		rapl_hw_unit[RAPL_IDX_RAM_NRG_STAT] = 16;
 
 	/*
 	 * Calculate the timer rate:
@@ -704,7 +698,7 @@ static const struct x86_cpu_id rapl_cpu_match[] __initconst = {
 
 static int __init rapl_pmu_init(void)
 {
-	void (*quirk)(void) = NULL;
+	bool apply_quirk = false;
 	int ret;
 
 	if (!x86_match_cpu(rapl_cpu_match))
@@ -717,7 +711,7 @@ static int __init rapl_pmu_init(void)
 		rapl_pmu_events_group.attrs = rapl_events_cln_attr;
 		break;
 	case 63: /* Haswell-Server */
-		quirk = rapl_hsw_server_quirk;
+		apply_quirk = true;
 		rapl_cntr_mask = RAPL_IDX_SRV;
 		rapl_pmu_events_group.attrs = rapl_events_srv_attr;
 		break;
@@ -733,7 +727,7 @@ static int __init rapl_pmu_init(void)
 		rapl_pmu_events_group.attrs = rapl_events_srv_attr;
 		break;
 	case 87: /* Knights Landing */
-		quirk = rapl_hsw_server_quirk;
+		apply_quirk = true;
 		rapl_cntr_mask = RAPL_IDX_KNL;
 		rapl_pmu_events_group.attrs = rapl_events_knl_attr;
 		break;
@@ -741,7 +735,7 @@ static int __init rapl_pmu_init(void)
 		return -ENODEV;
 	}
 
-	ret = rapl_check_hw_unit(quirk);
+	ret = rapl_check_hw_unit(apply_quirk);
 	if (ret)
 		return ret;
 
-- 
2.3.5

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.

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#1353261 — [tip:perf/core] perf/x86/intel/rapl: Simplify quirk handling even more

Commit-ID:  7a8698058ae493ae53b1a8a2fa23d2e37000d73e
Gitweb:     http://git.kernel.org/tip/7a8698058ae493ae53b1a8a2fa23d2e37000d73e
Author:     Borislav Petkov <bp@alien8.de>
AuthorDate: Tue, 8 Mar 2016 17:40:41 +0100
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 8 Mar 2016 17:49:52 +0100

perf/x86/intel/rapl: Simplify quirk handling even more

Drop the quirk() function pointer in favor of a simple boolean which
says whether the quirk should be applied or not. Update comment while at
it.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Harish Chegondi <harish.chegondi@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: linux-tip-commits@vger.kernel.org
Link: http://lkml.kernel.org/r/20160308164041.GF16568@pd.tnic
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/events/intel/rapl.c | 32 +++++++++++++-------------------
 1 file changed, 13 insertions(+), 19 deletions(-)

diff --git a/arch/x86/events/intel/rapl.c b/arch/x86/events/intel/rapl.c
index 019e541..b834a3f 100644
--- a/arch/x86/events/intel/rapl.c
+++ b/arch/x86/events/intel/rapl.c
@@ -592,18 +592,7 @@ static int rapl_cpu_notifier(struct notifier_block *self,
 	return NOTIFY_OK;
 }
 
-static __init void rapl_hsw_server_quirk(void)
-{
-	/*
-	 * DRAM domain on HSW server has fixed energy unit which can be
-	 * different than the unit from power unit MSR.
-	 * "Intel Xeon Processor E5-1600 and E5-2600 v3 Product Families, V2
-	 * of 2. Datasheet, September 2014, Reference Number: 330784-001 "
-	 */
-	rapl_hw_unit[RAPL_IDX_RAM_NRG_STAT] = 16;
-}
-
-static int rapl_check_hw_unit(void (*quirk)(void))
+static int rapl_check_hw_unit(bool apply_quirk)
 {
 	u64 msr_rapl_power_unit_bits;
 	int i;
@@ -614,9 +603,14 @@ static int rapl_check_hw_unit(void (*quirk)(void))
 	for (i = 0; i < NR_RAPL_DOMAINS; i++)
 		rapl_hw_unit[i] = (msr_rapl_power_unit_bits >> 8) & 0x1FULL;
 
-	/* Apply cpu model quirk */
-	if (quirk)
-		quirk();
+	/*
+	 * DRAM domain on HSW server and KNL has fixed energy unit which can be
+	 * different than the unit from power unit MSR. See
+	 * "Intel Xeon Processor E5-1600 and E5-2600 v3 Product Families, V2
+	 * of 2. Datasheet, September 2014, Reference Number: 330784-001 "
+	 */
+	if (apply_quirk)
+		rapl_hw_unit[RAPL_IDX_RAM_NRG_STAT] = 16;
 
 	/*
 	 * Calculate the timer rate:
@@ -704,7 +698,7 @@ static const struct x86_cpu_id rapl_cpu_match[] __initconst = {
 
 static int __init rapl_pmu_init(void)
 {
-	void (*quirk)(void) = NULL;
+	bool apply_quirk = false;
 	int ret;
 
 	if (!x86_match_cpu(rapl_cpu_match))
@@ -717,7 +711,7 @@ static int __init rapl_pmu_init(void)
 		rapl_pmu_events_group.attrs = rapl_events_cln_attr;
 		break;
 	case 63: /* Haswell-Server */
-		quirk = rapl_hsw_server_quirk;
+		apply_quirk = true;
 		rapl_cntr_mask = RAPL_IDX_SRV;
 		rapl_pmu_events_group.attrs = rapl_events_srv_attr;
 		break;
@@ -733,7 +727,7 @@ static int __init rapl_pmu_init(void)
 		rapl_pmu_events_group.attrs = rapl_events_srv_attr;
 		break;
 	case 87: /* Knights Landing */
-		quirk = rapl_hsw_server_quirk;
+		apply_quirk = true;
 		rapl_cntr_mask = RAPL_IDX_KNL;
 		rapl_pmu_events_group.attrs = rapl_events_knl_attr;
 		break;
@@ -741,7 +735,7 @@ static int __init rapl_pmu_init(void)
 		return -ENODEV;
 	}
 
-	ret = rapl_check_hw_unit(quirk);
+	ret = rapl_check_hw_unit(apply_quirk);
 	if (ret)
 		return ret;
 

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