linux-kernel - RE: [PATCH v2 5/7] x86/resctrl: Add package scoped resource

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Date:   Thu, 29 Jun 2023 07:38:58 +0000
From:   "Shaopeng Tan (Fujitsu)" <tan.shaopeng@...itsu.com>
To:     'Tony Luck' <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Peter Newman <peternewman@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        "x86@...nel.org" <x86@...nel.org>
CC:     James Morse <james.morse@....com>,
        Jamie Iles <quic_jiles@...cinc.com>,
        Babu Moger <babu.moger@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "patches@...ts.linux.dev" <patches@...ts.linux.dev>
Subject: RE: [PATCH v2 5/7] x86/resctrl: Add package scoped resource

Hi Tony,

> Some Intel features require setting a package scoped model specific register.
> 
> Add a new resource that builds domains for each package.
> 
> Signed-off-by: Tony Luck <tony.luck@...el.com>
> ---
>  include/linux/resctrl.h                |  1 +
>  arch/x86/kernel/cpu/resctrl/internal.h |  6 ++++++
>  arch/x86/kernel/cpu/resctrl/core.c     | 23
> +++++++++++++++++++----
>  3 files changed, 26 insertions(+), 4 deletions(-)
> 
> diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h index
> 25051daa6655..f504f6263fec 100644
> --- a/include/linux/resctrl.h
> +++ b/include/linux/resctrl.h
> @@ -167,6 +167,7 @@ struct rdt_resource {
>  	int			rid;
>  	bool			alloc_capable;
>  	bool			mon_capable;
> +	bool			pkg_actions;
>  	int			num_rmid;
>  	int			scope;
>  	struct resctrl_cache	cache;
> diff --git a/arch/x86/kernel/cpu/resctrl/internal.h
> b/arch/x86/kernel/cpu/resctrl/internal.h
> index 38bac0062c82..e51a5004be77 100644
> --- a/arch/x86/kernel/cpu/resctrl/internal.h
> +++ b/arch/x86/kernel/cpu/resctrl/internal.h
> @@ -438,6 +438,7 @@ enum resctrl_res_level {
>  	RDT_RESOURCE_MBA,
>  	RDT_RESOURCE_SMBA,
>  	RDT_RESOURCE_NODE,
> +	RDT_RESOURCE_PKG,
> 
>  	/* Must be the last */
>  	RDT_NUM_RESOURCES,
> @@ -447,6 +448,7 @@ enum resctrl_scope {
>  	SCOPE_L2_CACHE = 2,
>  	SCOPE_L3_CACHE = 3,
>  	SCOPE_NODE,
> +	SCOPE_PKG,
>  };
> 
>  static inline int get_mbm_res_level(void) @@ -482,6 +484,10 @@ int
> resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable);
>  	for_each_rdt_resource(r)					      \
>  		if (r->alloc_capable || r->mon_capable)
> 
> +#define for_each_domain_needed_rdt_resource(r)
> 	      \
> +	for_each_rdt_resource(r)					      \
> +		if (r->alloc_capable || r->mon_capable || r->pkg_actions)
> +
>  #define for_each_alloc_capable_rdt_resource(r)
> \
>  	for_each_rdt_resource(r)					      \
>  		if (r->alloc_capable)
> diff --git a/arch/x86/kernel/cpu/resctrl/core.c
> b/arch/x86/kernel/cpu/resctrl/core.c
> index 6fe9f87d4403..af3be3c2db96 100644
> --- a/arch/x86/kernel/cpu/resctrl/core.c
> +++ b/arch/x86/kernel/cpu/resctrl/core.c
> @@ -127,6 +127,16 @@ struct rdt_hw_resource rdt_resources_all[] = {
>  			.fflags			= 0,
>  		},
>  	},
> +	[RDT_RESOURCE_PKG] =
> +	{
> +		.r_resctrl = {
> +			.rid			= RDT_RESOURCE_PKG,
> +			.name			= "PKG",
> +			.scope			= SCOPE_PKG,
> +			.domains		=
> domain_init(RDT_RESOURCE_PKG),
> +			.fflags			= 0,
> +		},
> +	},
>  };
> 
>  /*
> @@ -504,9 +514,14 @@ static int arch_domain_mbm_alloc(u32 num_rmid,
> struct rdt_hw_domain *hw_dom)
> 
>  static int get_domain_id(int cpu, enum resctrl_scope scope)  {
> -	if (scope == SCOPE_NODE)
> +	switch (scope) {
> +	case SCOPE_NODE:
>  		return cpu_to_node(cpu);
> -	return get_cpu_cacheinfo_id(cpu, scope);
> +	case SCOPE_PKG:
> +		return topology_physical_package_id(cpu);
> +	default:
> +		return get_cpu_cacheinfo_id(cpu, scope);
> +	}
>  }
> 
>  /*
> @@ -630,7 +645,7 @@ static int resctrl_online_cpu(unsigned int cpu)
>  	struct rdt_resource *r;
> 
>  	mutex_lock(&rdtgroup_mutex);
> -	for_each_capable_rdt_resource(r)
> +	for_each_domain_needed_rdt_resource(r)
>  		domain_add_cpu(cpu, r);
>  	/* The cpu is set in default rdtgroup after online. */
>  	cpumask_set_cpu(cpu, &rdtgroup_default.cpu_mask); @@ -657,7
> +672,7 @@ static int resctrl_offline_cpu(unsigned int cpu)
>  	struct rdt_resource *r;
> 
>  	mutex_lock(&rdtgroup_mutex);
> -	for_each_capable_rdt_resource(r)
> +	for_each_domain_needed_rdt_resource(r)

Function for_each_capable_rdt_resource(r) is no longer used in anywhere,
I think it is better to remove "#define for_each_capable_rdt_resource(r)" together.

Best regards,
Shaopeng TAN