linux-kernel - Re: [PATCH v3 09/10] cxl/pci: Use pci core's DVSEC functionality

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Message-ID: <20211011143504.00003b2d@Huawei.com>
Date:   Mon, 11 Oct 2021 14:35:04 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Dan Williams <dan.j.williams@...el.com>
CC:     <linux-cxl@...r.kernel.org>, Ben Widawsky <ben.widawsky@...el.com>,
        <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <hch@....de>
Subject: Re: [PATCH v3 09/10] cxl/pci: Use pci core's DVSEC functionality

On Sat, 9 Oct 2021 09:44:45 -0700
Dan Williams <dan.j.williams@...el.com> wrote:

> From: Ben Widawsky <ben.widawsky@...el.com>
> 
> Reduce maintenance burden of DVSEC query implementation by using the
> centralized PCI core implementation.
> 
> Signed-off-by: Ben Widawsky <ben.widawsky@...el.com>
> [djbw: kill cxl_pci_dvsec()]
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>

Very pleased to see this being cleaned up.  Thanks,
fwiw
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

> ---
>  drivers/cxl/pci.c |   26 ++------------------------
>  1 file changed, 2 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
> index b6bc8e5ca028..f2e2a02d1fe6 100644
> --- a/drivers/cxl/pci.c
> +++ b/drivers/cxl/pci.c
> @@ -340,29 +340,6 @@ static void cxl_unmap_regblock(struct pci_dev *pdev,
>  	map->base = NULL;
>  }
>  
> -static int cxl_pci_dvsec(struct pci_dev *pdev, int dvsec)
> -{
> -	int pos;
> -
> -	pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_DVSEC);
> -	if (!pos)
> -		return 0;
> -
> -	while (pos) {
> -		u16 vendor, id;
> -
> -		pci_read_config_word(pdev, pos + PCI_DVSEC_HEADER1, &vendor);
> -		pci_read_config_word(pdev, pos + PCI_DVSEC_HEADER2, &id);
> -		if (vendor == PCI_DVSEC_VENDOR_ID_CXL && dvsec == id)
> -			return pos;
> -
> -		pos = pci_find_next_ext_capability(pdev, pos,
> -						   PCI_EXT_CAP_ID_DVSEC);
> -	}
> -
> -	return 0;
> -}
> -
>  static int cxl_probe_regs(struct pci_dev *pdev, struct cxl_register_map *map)
>  {
>  	struct cxl_component_reg_map *comp_map;
> @@ -449,7 +426,8 @@ static int cxl_find_regblock(struct pci_dev *pdev, enum cxl_regloc_type type,
>  	u32 regloc_size, regblocks;
>  	int regloc, i;
>  
> -	regloc = cxl_pci_dvsec(pdev, PCI_DVSEC_ID_CXL_REGLOC_DVSEC_ID);
> +	regloc = pci_find_dvsec_capability(pdev, PCI_DVSEC_VENDOR_ID_CXL,
> +					   PCI_DVSEC_ID_CXL_REGLOC_DVSEC_ID);
>  	if (!regloc)
>  		return -ENXIO;
>  
>