linux-kernel - Re: [RFC PATCH V2 11/22] x86/intel_rdt: Associate pseudo-locked regions with its domain

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Date:   Mon, 19 Feb 2018 22:19:54 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Reinette Chatre <reinette.chatre@...el.com>
cc:     fenghua.yu@...el.com, tony.luck@...el.com, gavin.hindman@...el.com,
        vikas.shivappa@...ux.intel.com, dave.hansen@...el.com,
        mingo@...hat.com, hpa@...or.com, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH V2 11/22] x86/intel_rdt: Associate pseudo-locked
 regions with its domain

On Tue, 13 Feb 2018, Reinette Chatre wrote:

> After a pseudo-locked region is locked it needs to be associated with
> the RDT domain representing the pseudo-locked cache so that its life
> cycle can be managed correctly.
> 
> Only a single pseudo-locked region can exist on any cache instance so we
> maintain a single pointer to a pseudo-locked region from each RDT
> domain.

Why is only a single pseudo locked region possible? 

> Signed-off-by: Reinette Chatre <reinette.chatre@...el.com>
> ---
>  arch/x86/kernel/cpu/intel_rdt.h | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/x86/kernel/cpu/intel_rdt.h b/arch/x86/kernel/cpu/intel_rdt.h
> index 060a0976ac00..f0e020686e99 100644
> --- a/arch/x86/kernel/cpu/intel_rdt.h
> +++ b/arch/x86/kernel/cpu/intel_rdt.h
> @@ -187,6 +187,8 @@ struct mbm_state {
>  	u64	prev_msr;
>  };
>  
> +struct pseudo_lock_region;
> +
>  /**
>   * struct rdt_domain - group of cpus sharing an RDT resource
>   * @list:	all instances of this resource
> @@ -205,6 +207,7 @@ struct mbm_state {
>   * @ctrl_val:	array of cache or mem ctrl values (indexed by CLOSID)
>   * @new_ctrl:	new ctrl value to be loaded
>   * @have_new_ctrl: did user provide new_ctrl for this domain
> + * @plr:	pseudo-locked region associated with this domain
>   */
>  struct rdt_domain {
>  	struct list_head	list;
> @@ -220,6 +223,7 @@ struct rdt_domain {
>  	u32			*ctrl_val;
>  	u32			new_ctrl;
>  	bool			have_new_ctrl;
> +	struct pseudo_lock_region	*plr;

Please keep the tabular fashion of the struct declaration intact.

Thanks,

	tglx