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

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Date: Wed, 14 Feb 2024 15:45:27 -0800
From: Ian Rogers <irogers@...gle.com>
To: kan.liang@...ux.intel.com
Cc: peterz@...radead.org, mingo@...nel.org, acme@...nel.org, 
	namhyung@...nel.org, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org, mpetlan@...hat.com, eranian@...gle.com, 
	ak@...ux.intel.com, stable@...r.kernel.org
Subject: Re: [PATCH] perf/x86/intel/uncore: Fix the bits of the CHA extended
 umask for SPR

On Wed, Feb 14, 2024 at 7:58 AM <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/
> Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
> Cc: stable@...r.kernel.org

Reviewed-by: Ian Rogers <irogers@...gle.com>

Thanks,
Ian

> ---
>  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,
> --
> 2.35.1
>