linux-kernel - Re: [RESEND PATCH] perf/x86/intel/uncore: Fix the bits of the CHA extended umask for SPR

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Message-ID: <67f531f8-6d8c-49f7-a405-09cce28f738b@linux.intel.com>
Date: Wed, 29 May 2024 09:12:05 -0400
From: "Liang, Kan" <kan.liang@...ux.intel.com>
To: peterz@...radead.org, mingo@...nel.org, acme@...nel.org,
 namhyung@...nel.org, linux-kernel@...r.kernel.org,
 linux-perf-users@...r.kernel.org
Cc: irogers@...gle.com, mpetlan@...hat.com, eranian@...gle.com,
 ak@...ux.intel.com, stable@...r.kernel.org
Subject: Re: [RESEND PATCH] perf/x86/intel/uncore: Fix the bits of the CHA
 extended umask for SPR

Hi Peter and Ingo,

Could you please take a look and accept the bug fix patch?

It's to fix some broken uncore events on SPR.
https://lore.kernel.org/linux-perf-users/alpine.LRH.2.20.2405281153210.4040@Diego/

Thanks,
Kan

On 2024-04-16 2:01 p.m., kan.liang@...ux.intel.com wrote:
> From: Kan Liang <kan.liang@...ux.intel.com>
> 
> The perf stat errors out with UNC_CHA_TOR_INSERTS.IA_HIT_CXL_ACC_LOCAL
> event.
> 
>  $perf stat -e uncore_cha_55/event=0x35,umask=0x10c0008101/ -a -- ls
>     event syntax error: '..0x35,umask=0x10c0008101/'
>                                       \___ Bad event or PMU
> 
> The definition of the CHA umask is config:8-15,32-55, which is 32bit.
> However, the umask of the event is bigger than 32bit.
> This is an error in the original uncore spec.
> 
> Add a new umask_ext5 for the new CHA umask range.
> 
> Fixes: 949b11381f81 ("perf/x86/intel/uncore: Add Sapphire Rapids server CHA support")
> Closes: https://lore.kernel.org/linux-perf-users/alpine.LRH.2.20.2401300733310.11354@Diego/
> Reviewed-by: Ian Rogers <irogers@...gle.com>
> Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
> Cc: stable@...r.kernel.org
> ---
>  arch/x86/events/intel/uncore_snbep.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
> index a96496bef678..7924f315269a 100644
> --- a/arch/x86/events/intel/uncore_snbep.c
> +++ b/arch/x86/events/intel/uncore_snbep.c
> @@ -461,6 +461,7 @@
>  #define SPR_UBOX_DID				0x3250
>  
>  /* SPR CHA */
> +#define SPR_CHA_EVENT_MASK_EXT			0xffffffff
>  #define SPR_CHA_PMON_CTL_TID_EN			(1 << 16)
>  #define SPR_CHA_PMON_EVENT_MASK			(SNBEP_PMON_RAW_EVENT_MASK | \
>  						 SPR_CHA_PMON_CTL_TID_EN)
> @@ -477,6 +478,7 @@ DEFINE_UNCORE_FORMAT_ATTR(umask_ext, umask, "config:8-15,32-43,45-55");
>  DEFINE_UNCORE_FORMAT_ATTR(umask_ext2, umask, "config:8-15,32-57");
>  DEFINE_UNCORE_FORMAT_ATTR(umask_ext3, umask, "config:8-15,32-39");
>  DEFINE_UNCORE_FORMAT_ATTR(umask_ext4, umask, "config:8-15,32-55");
> +DEFINE_UNCORE_FORMAT_ATTR(umask_ext5, umask, "config:8-15,32-63");
>  DEFINE_UNCORE_FORMAT_ATTR(qor, qor, "config:16");
>  DEFINE_UNCORE_FORMAT_ATTR(edge, edge, "config:18");
>  DEFINE_UNCORE_FORMAT_ATTR(tid_en, tid_en, "config:19");
> @@ -5957,7 +5959,7 @@ static struct intel_uncore_ops spr_uncore_chabox_ops = {
>  
>  static struct attribute *spr_uncore_cha_formats_attr[] = {
>  	&format_attr_event.attr,
> -	&format_attr_umask_ext4.attr,
> +	&format_attr_umask_ext5.attr,
>  	&format_attr_tid_en2.attr,
>  	&format_attr_edge.attr,
>  	&format_attr_inv.attr,
> @@ -5993,7 +5995,7 @@ ATTRIBUTE_GROUPS(uncore_alias);
>  static struct intel_uncore_type spr_uncore_chabox = {
>  	.name			= "cha",
>  	.event_mask		= SPR_CHA_PMON_EVENT_MASK,
> -	.event_mask_ext		= SPR_RAW_EVENT_MASK_EXT,
> +	.event_mask_ext		= SPR_CHA_EVENT_MASK_EXT,
>  	.num_shared_regs	= 1,
>  	.constraints		= skx_uncore_chabox_constraints,
>  	.ops			= &spr_uncore_chabox_ops,