netdev - Re: [PATCH v11 18/23] cxl: allow region creation by type2 drivers

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Message-ID: <20250320162101.GB892515@horms.kernel.org>
Date: Thu, 20 Mar 2025 16:21:01 +0000
From: Simon Horman <horms@...nel.org>
To: alejandro.lucero-palau@....com
Cc: linux-cxl@...r.kernel.org, netdev@...r.kernel.org,
	dan.j.williams@...el.com, edward.cree@....com, davem@...emloft.net,
	kuba@...nel.org, pabeni@...hat.com, edumazet@...gle.com,
	dave.jiang@...el.com, Alejandro Lucero <alucerop@....com>
Subject: Re: [PATCH v11 18/23] cxl: allow region creation by type2 drivers

On Mon, Mar 10, 2025 at 09:03:35PM +0000, alejandro.lucero-palau@....com wrote:
> From: Alejandro Lucero <alucerop@....com>
> 
> Creating a CXL region requires userspace intervention through the cxl
> sysfs files. Type2 support should allow accelerator drivers to create
> such cxl region from kernel code.
> 
> Adding that functionality and integrating it with current support for
> memory expanders.
> 
> Based on https://lore.kernel.org/linux-cxl/168592159835.1948938.1647215579839222774.stgit@dwillia2-xfh.jf.intel.com/
> 
> Signed-off-by: Alejandro Lucero <alucerop@....com>

...

> +/**
> + * cxl_create_region - Establish a region given an endpoint decoder
> + * @cxlrd: root decoder to allocate HPA
> + * @cxled: endpoint decoder with reserved DPA capacity

nit: @ways should also be documented here.

     Flagged by W=1 builds.

> + *
> + * Returns a fully formed region in the commit state and attached to the
> + * cxl_region driver.
> + */
> +struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd,
> +				     struct cxl_endpoint_decoder *cxled, int ways)

...