linux-kernel - Re: [PATCH 4/4] cxl/pci: Define a common function get_cxl

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Date: Wed, 22 May 2024 12:42:09 -0700
From: Dave Jiang <dave.jiang@...el.com>
To: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>,
 linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-cxl@...r.kernel.org
Cc: Ard Biesheuvel <ardb@...nel.org>,
 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>,
 Yazen Ghannam <yazen.ghannam@....com>, Bowman Terry <terry.bowman@....com>
Subject: Re: [PATCH 4/4] cxl/pci: Define a common function get_cxl_dev()



On 5/22/24 8:08 AM, Smita Koralahalli wrote:
> Refactor computation of cxlds to a common function get_cxl_dev() and reuse
> the function in both cxl_handle_cper_event() and cxl_handle_prot_err().

I think just introduce the function where you open coded it instead of adding code and then deleting them in the same series.
> 
> Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
> ---
>  drivers/cxl/pci.c | 52 +++++++++++++++++++++++------------------------
>  1 file changed, 26 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
> index 3e3c36983686..26e65e5b68cb 100644
> --- a/drivers/cxl/pci.c
> +++ b/drivers/cxl/pci.c
> @@ -974,32 +974,43 @@ static struct pci_driver cxl_pci_driver = {
>  	},
>  };
>  
> +static struct cxl_dev_state *get_cxl_dev(u16 segment, u8 bus, u8 device,
> +					 u8 function)

get_cxlds() or get_cxl_device_state() would be better. 

DJ

> +{
> +	struct pci_dev *pdev __free(pci_dev_put) = NULL;
> +	struct cxl_dev_state *cxlds;
> +	unsigned int devfn;
> +
> +	devfn = PCI_DEVFN(device, function);
> +	pdev = pci_get_domain_bus_and_slot(segment, bus, devfn);
> +
> +	if (!pdev)
> +		return NULL;
> +
> +	guard(device)(&pdev->dev);
> +	if (pdev->driver != &cxl_pci_driver)
> +		return NULL;
> +
> +	cxlds = pci_get_drvdata(pdev);
> +
> +	return cxlds;
> +}
> +
>  #define CXL_EVENT_HDR_FLAGS_REC_SEVERITY GENMASK(1, 0)
>  static void cxl_handle_cper_event(enum cxl_event_type ev_type,
>  				  struct cxl_cper_event_rec *rec)
>  {
>  	struct cper_cxl_event_devid *device_id = &rec->hdr.device_id;
> -	struct pci_dev *pdev __free(pci_dev_put) = NULL;
>  	enum cxl_event_log_type log_type;
>  	struct cxl_dev_state *cxlds;
> -	unsigned int devfn;
>  	u32 hdr_flags;
>  
>  	pr_debug("CPER event %d for device %u:%u:%u.%u\n", ev_type,
>  		 device_id->segment_num, device_id->bus_num,
>  		 device_id->device_num, device_id->func_num);
>  
> -	devfn = PCI_DEVFN(device_id->device_num, device_id->func_num);
> -	pdev = pci_get_domain_bus_and_slot(device_id->segment_num,
> -					   device_id->bus_num, devfn);
> -	if (!pdev)
> -		return;
> -
> -	guard(device)(&pdev->dev);
> -	if (pdev->driver != &cxl_pci_driver)
> -		return;
> -
> -	cxlds = pci_get_drvdata(pdev);
> +	cxlds = get_cxl_dev(device_id->segment_num, device_id->bus_num,
> +			    device_id->device_num, device_id->func_num);
>  	if (!cxlds)
>  		return;
>  
> @@ -1013,21 +1024,10 @@ static void cxl_handle_cper_event(enum cxl_event_type ev_type,
>  
>  static void cxl_handle_prot_err(struct cxl_cper_prot_err *p_err)
>  {
> -	struct pci_dev *pdev __free(pci_dev_put) = NULL;
>  	struct cxl_dev_state *cxlds;
> -	unsigned int devfn;
>  
> -	devfn = PCI_DEVFN(p_err->device, p_err->function);
> -	pdev = pci_get_domain_bus_and_slot(p_err->segment,
> -					   p_err->bus, devfn);
> -	if (!pdev)
> -		return;
> -
> -	guard(device)(&pdev->dev);
> -	if (pdev->driver != &cxl_pci_driver)
> -		return;
> -
> -	cxlds = pci_get_drvdata(pdev);
> +	cxlds = get_cxl_dev(p_err->segment, p_err->bus,
> +			    p_err->device, p_err->function);
>  	if (!cxlds)
>  		return;
>