linux-kernel - Re: [PATCH 1/5] perf/x86/intel/uncore: Generic uncore_get

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Date:   Mon, 16 Oct 2023 13:47:20 -0400
From:   "Liang, Kan" <kan.liang@...ux.intel.com>
To:     peterz@...radead.org, mingo@...hat.com,
        linux-kernel@...r.kernel.org
Cc:     eranian@...gle.com, ak@...ux.intel.com
Subject: Re: [PATCH 1/5] perf/x86/intel/uncore: Generic uncore_get_uncores and
 MMIO format of SPR

Hi Peter & Ingo,

Could you please share your comments for this series?

The series is to support the uncore PMU on GNR, SRF, and GRR.

Thanks,
Kan

On 2023-10-02 11:03 a.m., kan.liang@...ux.intel.com wrote:
> From: Kan Liang <kan.liang@...ux.intel.com>
> 
> Factor out SPR_UNCORE_MMIO_COMMON_FORMAT which can be reused by
> Granite Rapids in the following patch.
> 
> Granite Rapids have more uncore units than Sapphire Rapids. Add new
> parameters to support adjustable uncore units.
> 
> No functional change.
> 
> Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
> ---
>  arch/x86/events/intel/uncore_snbep.c | 34 +++++++++++++++++++---------
>  1 file changed, 23 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
> index d49e90dc04a4..cef51b83410a 100644
> --- a/arch/x86/events/intel/uncore_snbep.c
> +++ b/arch/x86/events/intel/uncore_snbep.c
> @@ -6079,13 +6079,16 @@ static struct uncore_event_desc spr_uncore_imc_events[] = {
>  	{ /* end: all zeroes */ },
>  };
>  
> +#define SPR_UNCORE_MMIO_COMMON_FORMAT()				\
> +	SPR_UNCORE_COMMON_FORMAT(),				\
> +	.ops			= &spr_uncore_mmio_ops
> +
>  static struct intel_uncore_type spr_uncore_imc = {
> -	SPR_UNCORE_COMMON_FORMAT(),
> +	SPR_UNCORE_MMIO_COMMON_FORMAT(),
>  	.name			= "imc",
>  	.fixed_ctr_bits		= 48,
>  	.fixed_ctr		= SNR_IMC_MMIO_PMON_FIXED_CTR,
>  	.fixed_ctl		= SNR_IMC_MMIO_PMON_FIXED_CTL,
> -	.ops			= &spr_uncore_mmio_ops,
>  	.event_descs		= spr_uncore_imc_events,
>  };
>  
> @@ -6412,7 +6415,8 @@ static void uncore_type_customized_copy(struct intel_uncore_type *to_type,
>  
>  static struct intel_uncore_type **
>  uncore_get_uncores(enum uncore_access_type type_id, int num_extra,
> -		    struct intel_uncore_type **extra)
> +		   struct intel_uncore_type **extra, int max_num_types,
> +		   struct intel_uncore_type **uncores)
>  {
>  	struct intel_uncore_type **types, **start_types;
>  	int i;
> @@ -6421,9 +6425,9 @@ uncore_get_uncores(enum uncore_access_type type_id, int num_extra,
>  
>  	/* Only copy the customized features */
>  	for (; *types; types++) {
> -		if ((*types)->type_id >= UNCORE_SPR_NUM_UNCORE_TYPES)
> +		if ((*types)->type_id >= max_num_types)
>  			continue;
> -		uncore_type_customized_copy(*types, spr_uncores[(*types)->type_id]);
> +		uncore_type_customized_copy(*types, uncores[(*types)->type_id]);
>  	}
>  
>  	for (i = 0; i < num_extra; i++, types++)
> @@ -6470,7 +6474,9 @@ void spr_uncore_cpu_init(void)
>  
>  	uncore_msr_uncores = uncore_get_uncores(UNCORE_ACCESS_MSR,
>  						UNCORE_SPR_MSR_EXTRA_UNCORES,
> -						spr_msr_uncores);
> +						spr_msr_uncores,
> +						UNCORE_SPR_NUM_UNCORE_TYPES,
> +						spr_uncores);
>  
>  	type = uncore_find_type_by_id(uncore_msr_uncores, UNCORE_SPR_CHA);
>  	if (type) {
> @@ -6542,7 +6548,9 @@ int spr_uncore_pci_init(void)
>  	spr_update_device_location(UNCORE_SPR_M3UPI);
>  	uncore_pci_uncores = uncore_get_uncores(UNCORE_ACCESS_PCI,
>  						UNCORE_SPR_PCI_EXTRA_UNCORES,
> -						spr_pci_uncores);
> +						spr_pci_uncores,
> +						UNCORE_SPR_NUM_UNCORE_TYPES,
> +						spr_uncores);
>  	return 0;
>  }
>  
> @@ -6550,12 +6558,16 @@ void spr_uncore_mmio_init(void)
>  {
>  	int ret = snbep_pci2phy_map_init(0x3250, SKX_CPUNODEID, SKX_GIDNIDMAP, true);
>  
> -	if (ret)
> -		uncore_mmio_uncores = uncore_get_uncores(UNCORE_ACCESS_MMIO, 0, NULL);
> -	else {
> +	if (ret) {
> +		uncore_mmio_uncores = uncore_get_uncores(UNCORE_ACCESS_MMIO, 0, NULL,
> +							 UNCORE_SPR_NUM_UNCORE_TYPES,
> +							 spr_uncores);
> +	} else {
>  		uncore_mmio_uncores = uncore_get_uncores(UNCORE_ACCESS_MMIO,
>  							 UNCORE_SPR_MMIO_EXTRA_UNCORES,
> -							 spr_mmio_uncores);
> +							 spr_mmio_uncores,
> +							 UNCORE_SPR_NUM_UNCORE_TYPES,
> +							 spr_uncores);
>  
>  		spr_uncore_imc_free_running.num_boxes = uncore_type_max_boxes(uncore_mmio_uncores, UNCORE_SPR_IMC) / 2;
>  	}