netdev - Re: [PATCH v17 01/22] cxl: Add type2 device basic support

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Message-ID: <20250625150628.00002255@huawei.com>
Date: Wed, 25 Jun 2025 15:06:28 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
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>, "Alison
 Schofield" <alison.schofield@...el.com>
Subject: Re: [PATCH v17 01/22] cxl: Add type2 device basic support

On Tue, 24 Jun 2025 15:13:34 +0100
<alejandro.lucero-palau@....com> wrote:

> From: Alejandro Lucero <alucerop@....com>
> 
> Differentiate CXL memory expanders (type 3) from CXL device accelerators
> (type 2) with a new function for initializing cxl_dev_state and a macro
> for helping accel drivers to embed cxl_dev_state inside a private
> struct.
> 
> Move structs to include/cxl as the size of the accel driver private
> struct embedding cxl_dev_state needs to know the size of this struct.
> 
> Use same new initialization with the type3 pci driver.
> 
> Signed-off-by: Alejandro Lucero <alucerop@....com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Reviewed-by: Dave Jiang <dave.jiang@...el.com>
> Reviewed-by: Alison Schofield <alison.schofield@...el.com>
Hi Alejandro,

A few really minor comments inline.

> ---
>  drivers/cxl/core/mbox.c      |  12 +-
>  drivers/cxl/core/memdev.c    |  32 +++++
>  drivers/cxl/core/pci.c       |   1 +
>  drivers/cxl/core/regs.c      |   1 +
>  drivers/cxl/cxl.h            |  97 +--------------
>  drivers/cxl/cxlmem.h         |  85 +------------
>  drivers/cxl/cxlpci.h         |  21 ----
>  drivers/cxl/pci.c            |  17 +--
>  include/cxl/cxl.h            | 226 +++++++++++++++++++++++++++++++++++
>  include/cxl/pci.h            |  23 ++++
>  tools/testing/cxl/test/mem.c |   3 +-
>  11 files changed, 303 insertions(+), 215 deletions(-)
>  create mode 100644 include/cxl/cxl.h
>  create mode 100644 include/cxl/pci.h
> 
> diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
> index d72764056ce6..d78f6039f997 100644
> --- a/drivers/cxl/core/mbox.c
> +++ b/drivers/cxl/core/mbox.c
> @@ -1484,23 +1484,21 @@ int cxl_mailbox_init(struct cxl_mailbox *cxl_mbox, struct device *host)
>  }
>  EXPORT_SYMBOL_NS_GPL(cxl_mailbox_init, "CXL");
>  
> -struct cxl_memdev_state *cxl_memdev_state_create(struct device *dev)
> +struct cxl_memdev_state *cxl_memdev_state_create(struct device *dev, u64 serial,
> +						 u16 dvsec)
>  {
>  	struct cxl_memdev_state *mds;
>  	int rc;
>  
> -	mds = devm_kzalloc(dev, sizeof(*mds), GFP_KERNEL);
> +	mds = devm_cxl_dev_state_create(dev, CXL_DEVTYPE_CLASSMEM, serial,
> +					dvsec, struct cxl_memdev_state, cxlds,
> +					true);


> diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
> index 3ec6b906371b..9cc4337cacfb 100644
> --- a/drivers/cxl/cxlmem.h
> +++ b/drivers/cxl/cxlmem.h
> @@ -7,6 +7,7 @@
>  #include <linux/cdev.h>
>  #include <linux/uuid.h>
>  #include <linux/node.h>

Is node still used in here?  If the includes was just for
struct access_coordinates then that is now gone from this file.

> +#include <cxl/cxl.h>
>  #include <cxl/event.h>
>  #include <cxl/mailbox.h>
>  #include "cxl.h"
> @@ -357,87 +358,6 @@ struct cxl_security_state {
>  	struct kernfs_node *sanitize_node;
>  };

> diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
> index 785aa2af5eaa..0d3c67867965 100644
> --- a/drivers/cxl/pci.c
> +++ b/drivers/cxl/pci.c

> @@ -924,19 +927,19 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  		return rc;
>  	pci_set_master(pdev);
>  
> -	mds = cxl_memdev_state_create(&pdev->dev);
> +	dvsec = pci_find_dvsec_capability(pdev, PCI_VENDOR_ID_CXL,
> +					  CXL_DVSEC_PCIE_DEVICE);
> +	if (!dvsec)
> +		dev_warn(&pdev->dev,
> +			 "Device DVSEC not present, skip CXL.mem init\n");

Could use pci_warn(pdev, "..."); Not particularly important.

> +
> +	mds = cxl_memdev_state_create(&pdev->dev, pci_get_dsn(pdev), dvsec);

Jonathan