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Date: Thu, 11 Apr 2024 15:14:06 +0100
From: Dave Martin <Dave.Martin@arm.com>
To: Reinette Chatre <reinette.chatre@intel.com>
Cc: James Morse <james.morse@arm.com>, x86@kernel.org,
	linux-kernel@vger.kernel.org, Fenghua Yu <fenghua.yu@intel.com>,
	Thomas Gleixner <tglx@linutronix.de>,
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	Xin Hao <xhao@linux.alibaba.com>, peternewman@google.com,
	dfustini@baylibre.com, amitsinght@marvell.com,
	David Hildenbrand <david@redhat.com>,
	Rex Nie <rex.nie@jaguarmicro.com>
Subject: Re: [PATCH v1 02/31] x86/resctrl: Add a helper to avoid reaching
 into the arch code resource list
Message-ID: <ZhfwLunw/CFCekr8@e133380.arm.com>
References: <20240321165106.31602-1-james.morse@arm.com>
 <20240321165106.31602-3-james.morse@arm.com>
 <65e1a55f-eac7-4804-900e-abf1bc0a9041@intel.com>
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In-Reply-To: <65e1a55f-eac7-4804-900e-abf1bc0a9041@intel.com>

On Mon, Apr 08, 2024 at 08:13:58PM -0700, Reinette Chatre wrote:
> Hi James,
> 
> On 3/21/2024 9:50 AM, James Morse wrote:
> > Resctrl occasionally wants to know something about a specific resource,
> > in these cases it reaches into the arch code's rdt_resources_all[]
> > array.
> > 
> > Once the filesystem parts of resctrl are moved to /fs/, this means it
> > will need visibility of the architecture specific struct
> > resctrl_hw_resource definition, and the array of all resources.
> 
> rdt_hw_resource?

Looks like it.  Noted for James' attention.


> > All architectures would also need a r_resctrl member in this struct.
> > 
> > Instead, abstract this via a helper to allow architectures to do
> > different things here. Move the level enum to the resctrl header and
> > add a helper to retrieve the struct rdt_resource by 'rid'.
> > 
> > resctrl_arch_get_resource() should not return NULL for any value in
> > the enum, it may instead return a dummy resource that is
> > !alloc_enabled && !mon_enabled.
> > 
> > Signed-off-by: James Morse <james.morse@arm.com>
> > ---
> 
> Patch looks good to me.
> 
> Reinette
> 

Noted, thanks.

Cheers
---Dave