linux-kernel - Re: [PATCH V2 12/13] perf/x86/intel/uncore: Add missing PMON units for Panther Lake

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Message-ID: <ab790924-2e69-4003-9e75-884a0a871012@linux.intel.com>
Date: Sun, 4 Jan 2026 10:49:38 +0800
From: "Mi, Dapeng" <dapeng1.mi@...ux.intel.com>
To: Zide Chen <zide.chen@...el.com>, Peter Zijlstra <peterz@...radead.org>,
 Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>,
 Namhyung Kim <namhyung@...nel.org>, Ian Rogers <irogers@...gle.com>,
 Adrian Hunter <adrian.hunter@...el.com>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Andi Kleen <ak@...ux.intel.com>, Eranian Stephane <eranian@...gle.com>
Cc: linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
 Xudong Hao <xudong.hao@...el.com>, Falcon Thomas <thomas.falcon@...el.com>
Subject: Re: [PATCH V2 12/13] perf/x86/intel/uncore: Add missing PMON units
 for Panther Lake


On 1/1/2026 6:42 AM, Zide Chen wrote:
> Besides CBOX, Panther Lake includes several legacy uncore PMON units
> not enumerated via discovery tables, including cNCU, SANTA, and
> ia_core_bridge.
>
> The cNCU PMON is similar to Meteor Lake but has two boxes with two
> counters each. SANTA and IA Core Bridge PMON units follow the legacy
> model used on Lunar Lake, Meteor Lake, and others.
>
> Panther Lake implements the Global Control Register; the freeze_all bit
> must be cleared before programming counters.
>
> Signed-off-by: Zide Chen <zide.chen@...el.com>
> ---
> V2: new patch
>
>  arch/x86/events/intel/uncore.c     |  1 +
>  arch/x86/events/intel/uncore_snb.c | 45 ++++++++++++++++++++++++++++++
>  2 files changed, 46 insertions(+)
>
> diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
> index 54b3c1e3af32..07a9a2826398 100644
> --- a/arch/x86/events/intel/uncore.c
> +++ b/arch/x86/events/intel/uncore.c
> @@ -1814,6 +1814,7 @@ static const struct uncore_plat_init ptl_uncore_init __initconst = {
>  	.cpu_init = ptl_uncore_cpu_init,
>  	.mmio_init = ptl_uncore_mmio_init,
>  	.domain[0].discovery_base = UNCORE_DISCOVERY_MSR,
> +	.domain[0].global_init = uncore_mmio_global_init,
>  };
>  
>  static const struct uncore_plat_init icx_uncore_init __initconst = {
> diff --git a/arch/x86/events/intel/uncore_snb.c b/arch/x86/events/intel/uncore_snb.c
> index 807e582b8f17..c663b00b68fe 100644
> --- a/arch/x86/events/intel/uncore_snb.c
> +++ b/arch/x86/events/intel/uncore_snb.c
> @@ -245,6 +245,17 @@
>  #define MTL_UNC_HBO_CTR				0x2048
>  #define MTL_UNC_HBO_CTRL			0x2042
>  
> +/* PTL Low Power Bridge register */
> +#define PTL_UNC_IA_CORE_BRIDGE_PER_CTR0		0x2028
> +#define PTL_UNC_IA_CORE_BRIDGE_PERFEVTSEL0	0x2022
> +
> +/* PTL Santa register */
> +#define PTL_UNC_SANTA_CTR0			0x2418
> +#define PTL_UNC_SANTA_CTRL0			0x2412
> +
> +/* PTL cNCU register */
> +#define PTL_UNC_CNCU_MSR_OFFSET			0x140
> +
>  DEFINE_UNCORE_FORMAT_ATTR(event, event, "config:0-7");
>  DEFINE_UNCORE_FORMAT_ATTR(umask, umask, "config:8-15");
>  DEFINE_UNCORE_FORMAT_ATTR(chmask, chmask, "config:8-11");
> @@ -1921,8 +1932,36 @@ void ptl_uncore_mmio_init(void)
>  						 ptl_uncores);
>  }
>  
> +static struct intel_uncore_type ptl_uncore_ia_core_bridge = {
> +	.name		= "ia_core_bridge",
> +	.num_counters   = 2,
> +	.num_boxes	= 1,
> +	.perf_ctr_bits	= 48,
> +	.perf_ctr	= PTL_UNC_IA_CORE_BRIDGE_PER_CTR0,
> +	.event_ctl	= PTL_UNC_IA_CORE_BRIDGE_PERFEVTSEL0,
> +	.event_mask	= ADL_UNC_RAW_EVENT_MASK,
> +	.ops		= &icl_uncore_msr_ops,
> +	.format_group	= &adl_uncore_format_group,
> +};
> +
> +static struct intel_uncore_type ptl_uncore_santa = {
> +	.name		= "santa",
> +	.num_counters   = 2,
> +	.num_boxes	= 2,
> +	.perf_ctr_bits	= 48,
> +	.perf_ctr	= PTL_UNC_SANTA_CTR0,
> +	.event_ctl	= PTL_UNC_SANTA_CTRL0,
> +	.event_mask	= ADL_UNC_RAW_EVENT_MASK,
> +	.msr_offset	= SNB_UNC_CBO_MSR_OFFSET,
> +	.ops		= &icl_uncore_msr_ops,
> +	.format_group	= &adl_uncore_format_group,
> +};
> +
>  static struct intel_uncore_type *ptl_msr_uncores[] = {
>  	&mtl_uncore_cbox,
> +	&ptl_uncore_ia_core_bridge,
> +	&ptl_uncore_santa,
> +	&mtl_uncore_cncu,
>  	NULL
>  };
>  
> @@ -1930,6 +1969,12 @@ void ptl_uncore_cpu_init(void)
>  {
>  	mtl_uncore_cbox.num_boxes = 6;
>  	mtl_uncore_cbox.ops = &lnl_uncore_msr_ops;
> +
> +	mtl_uncore_cncu.num_counters = 2;
> +	mtl_uncore_cncu.num_boxes = 2;
> +	mtl_uncore_cncu.msr_offset = PTL_UNC_CNCU_MSR_OFFSET;
> +	mtl_uncore_cncu.single_fixed = 0;
> +
>  	uncore_msr_uncores = ptl_msr_uncores;
>  }
>  

Reviewed-by: Dapeng Mi <dapeng1.mi@...ux.intel.com>