netdev - Re: [PATCH v5 19/27] cxl: make region type based on endpoint type

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Message-ID: <20241119221631.000008a6@nvidia.com>
Date: Tue, 19 Nov 2024 22:16:31 +0200
From: Zhi Wang <zhiw@...dia.com>
To: <alejandro.lucero-palau@....com>
CC: <linux-cxl@...r.kernel.org>, <netdev@...r.kernel.org>,
	<dan.j.williams@...el.com>, <martin.habets@...inx.com>,
	<edward.cree@....com>, <davem@...emloft.net>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <edumazet@...gle.com>, Alejandro Lucero
	<alucerop@....com>
Subject: Re: [PATCH v5 19/27] cxl: make region type based on endpoint type

On Mon, 18 Nov 2024 16:44:26 +0000
<alejandro.lucero-palau@....com> wrote:

> From: Alejandro Lucero <alucerop@....com>
> 

LGTM. Reviewed-by: Zhi Wang <zhiw@...dia.com>

> Current code is expecting Type3 or CXL_DECODER_HOSTONLYMEM devices
> only. Support for Type2 implies region type needs to be based on the
> endpoint type instead.
> 
> Signed-off-by: Alejandro Lucero <alucerop@....com>
> ---
>  drivers/cxl/core/region.c | 14 +++++++++-----
>  1 file changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
> index d107cc1b4350..8e2dbd15cfc0 100644
> --- a/drivers/cxl/core/region.c
> +++ b/drivers/cxl/core/region.c
> @@ -2654,7 +2654,8 @@ static ssize_t create_ram_region_show(struct
> device *dev, }
>  
>  static struct cxl_region *__create_region(struct cxl_root_decoder
> *cxlrd,
> -					  enum cxl_decoder_mode
> mode, int id)
> +					  enum cxl_decoder_mode
> mode, int id,
> +					  enum cxl_decoder_type
> target_type) {
>  	int rc;
>  
> @@ -2676,7 +2677,7 @@ static struct cxl_region
> *__create_region(struct cxl_root_decoder *cxlrd, return
> ERR_PTR(-EBUSY); }
>  
> -	return devm_cxl_add_region(cxlrd, id, mode,
> CXL_DECODER_HOSTONLYMEM);
> +	return devm_cxl_add_region(cxlrd, id, mode, target_type);
>  }
>  
>  static ssize_t create_pmem_region_store(struct device *dev,
> @@ -2691,7 +2692,8 @@ static ssize_t create_pmem_region_store(struct
> device *dev, if (rc != 1)
>  		return -EINVAL;
>  
> -	cxlr = __create_region(cxlrd, CXL_DECODER_PMEM, id);
> +	cxlr = __create_region(cxlrd, CXL_DECODER_PMEM, id,
> +			       CXL_DECODER_HOSTONLYMEM);
>  	if (IS_ERR(cxlr))
>  		return PTR_ERR(cxlr);
>  
> @@ -2711,7 +2713,8 @@ static ssize_t create_ram_region_store(struct
> device *dev, if (rc != 1)
>  		return -EINVAL;
>  
> -	cxlr = __create_region(cxlrd, CXL_DECODER_RAM, id);
> +	cxlr = __create_region(cxlrd, CXL_DECODER_RAM, id,
> +			       CXL_DECODER_HOSTONLYMEM);
>  	if (IS_ERR(cxlr))
>  		return PTR_ERR(cxlr);
>  
> @@ -3372,7 +3375,8 @@ static struct cxl_region
> *construct_region(struct cxl_root_decoder *cxlrd, 
>  	do {
>  		cxlr = __create_region(cxlrd, cxled->mode,
> -
> atomic_read(&cxlrd->region_id));
> +
> atomic_read(&cxlrd->region_id),
> +				       cxled->cxld.target_type);
>  	} while (IS_ERR(cxlr) && PTR_ERR(cxlr) == -EBUSY);
>  
>  	if (IS_ERR(cxlr)) {