linux-kernel - Re: [PATCH v9 12/13] cxl/region: Factor out code into cxl_region_setup

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Message-ID: <a9121da1-7e14-4e69-897a-b4da7b7dd1a6@intel.com>
Date: Tue, 13 Jan 2026 15:39:38 -0700
From: Dave Jiang <dave.jiang@...el.com>
To: Robert Richter <rrichter@....com>,
 Alison Schofield <alison.schofield@...el.com>,
 Vishal Verma <vishal.l.verma@...el.com>, Ira Weiny <ira.weiny@...el.com>,
 Dan Williams <dan.j.williams@...el.com>,
 Jonathan Cameron <jonathan.cameron@...wei.com>,
 Davidlohr Bueso <dave@...olabs.net>
Cc: linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org,
 Gregory Price <gourry@...rry.net>,
 "Fabio M. De Francesco" <fabio.m.de.francesco@...ux.intel.com>,
 Terry Bowman <terry.bowman@....com>, Joshua Hahn <joshua.hahnjy@...il.com>
Subject: Re: [PATCH v9 12/13] cxl/region: Factor out code into
 cxl_region_setup_poison()



On 1/10/26 4:46 AM, Robert Richter wrote:
> Poison injection setup code is embedded in cxl_region_probe(). For
> improved encapsulation, readability, and maintainability, factor out
> code into function cxl_region_setup_poison().
> 
> This patch is a prerequisit to disable poison injection for Normalized
> Addressing.
> 
> No functional changes.
> 
> Signed-off-by: Robert Richter <rrichter@....com>

Reviewed-by: Dave Jiang <dave.jiang@...el.com>

Funny how I created the same patch yesterday for something else and didn't realize you already posted it.

> ---
>  drivers/cxl/core/region.c | 53 +++++++++++++++++++++------------------
>  1 file changed, 28 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
> index ed8469fa55a9..80cd77f0842e 100644
> --- a/drivers/cxl/core/region.c
> +++ b/drivers/cxl/core/region.c
> @@ -3916,6 +3916,31 @@ static int cxl_region_debugfs_poison_clear(void *data, u64 offset)
>  DEFINE_DEBUGFS_ATTRIBUTE(cxl_poison_clear_fops, NULL,
>  			 cxl_region_debugfs_poison_clear, "%llx\n");
>  
> +static int cxl_region_setup_poison(struct cxl_region *cxlr)
> +{
> +	struct device *dev = &cxlr->dev;
> +	struct cxl_region_params *p = &cxlr->params;
> +	struct dentry *dentry;
> +
> +	/* Create poison attributes if all memdevs support the capabilities */
> +	for (int i = 0; i < p->nr_targets; i++) {
> +		struct cxl_endpoint_decoder *cxled = p->targets[i];
> +		struct cxl_memdev *cxlmd = cxled_to_memdev(cxled);
> +
> +		if (!cxl_memdev_has_poison_cmd(cxlmd, CXL_POISON_ENABLED_INJECT) ||
> +		    !cxl_memdev_has_poison_cmd(cxlmd, CXL_POISON_ENABLED_CLEAR))
> +			return 0;
> +	}
> +
> +	dentry = cxl_debugfs_create_dir(dev_name(dev));
> +	debugfs_create_file("inject_poison", 0200, dentry, cxlr,
> +			    &cxl_poison_inject_fops);
> +	debugfs_create_file("clear_poison", 0200, dentry, cxlr,
> +			    &cxl_poison_clear_fops);
> +
> +	return devm_add_action_or_reset(dev, remove_debugfs, dentry);
> +}
> +
>  static int cxl_region_can_probe(struct cxl_region *cxlr)
>  {
>  	struct cxl_region_params *p = &cxlr->params;
> @@ -3945,7 +3970,6 @@ static int cxl_region_probe(struct device *dev)
>  {
>  	struct cxl_region *cxlr = to_cxl_region(dev);
>  	struct cxl_region_params *p = &cxlr->params;
> -	bool poison_supported = true;
>  	int rc;
>  
>  	rc = cxl_region_can_probe(cxlr);
> @@ -3969,30 +3993,9 @@ static int cxl_region_probe(struct device *dev)
>  	if (rc)
>  		return rc;
>  
> -	/* Create poison attributes if all memdevs support the capabilities */
> -	for (int i = 0; i < p->nr_targets; i++) {
> -		struct cxl_endpoint_decoder *cxled = p->targets[i];
> -		struct cxl_memdev *cxlmd = cxled_to_memdev(cxled);
> -
> -		if (!cxl_memdev_has_poison_cmd(cxlmd, CXL_POISON_ENABLED_INJECT) ||
> -		    !cxl_memdev_has_poison_cmd(cxlmd, CXL_POISON_ENABLED_CLEAR)) {
> -			poison_supported = false;
> -			break;
> -		}
> -	}
> -
> -	if (poison_supported) {
> -		struct dentry *dentry;
> -
> -		dentry = cxl_debugfs_create_dir(dev_name(dev));
> -		debugfs_create_file("inject_poison", 0200, dentry, cxlr,
> -				    &cxl_poison_inject_fops);
> -		debugfs_create_file("clear_poison", 0200, dentry, cxlr,
> -				    &cxl_poison_clear_fops);
> -		rc = devm_add_action_or_reset(dev, remove_debugfs, dentry);
> -		if (rc)
> -			return rc;
> -	}
> +	rc = cxl_region_setup_poison(cxlr);
> +	if (rc)
> +		return rc;
>  
>  	switch (cxlr->mode) {
>  	case CXL_PARTMODE_PMEM: