linux-kernel - Re: [PATCH] drivers: block: skd: remove skd_pci

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Date:   Mon, 14 Dec 2020 06:02:46 +0000
From:   Damien Le Moal <Damien.LeMoal@....com>
To:     "puranjay12@...il.com" <puranjay12@...il.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "bjorn@...gaas.com" <bjorn@...gaas.com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers: block: skd: remove skd_pci_info()

On Fri, 2020-12-11 at 22:11 +0530, Puranjay Mohan wrote:
> PCI core calls __pcie_print_link_status() for every device, it prints
> both the link width and the link speed. skd_pci_info() does the same
> thing again, hence it can be removed.

Hmmm... On my box, I see this for the skd card:

[    8.509243] pci 0000:d8:00.0: [1b39:0001] type 00 class 0x018000
[    8.515933] pci 0000:d8:00.0: reg 0x10: [mem 0xfbe00000-0xfbe0ffff]
[    8.521924] pci 0000:d8:00.0: reg 0x14: [mem 0xfbe10000-0xfbe10fff]
[    8.527957] pci 0000:d8:00.0: reg 0x30: [mem 0xfbd00000-0xfbdfffff
pref]
[    8.534999] pci 0000:d8:00.0: supports D1 D2

No link speed. Checking the code, I think you need to actually call
pcie_print_link_status() (which calls __pcie_print_link_status() with
verbose = true) from the driver to see anything. Otherwise, the PCIe
core will not print anything if the driver is just probing and getting
resources for the card.

> 
> Signed-off-by: Puranjay Mohan <puranjay12@...il.com>
> ---
>  drivers/block/skd_main.c | 31 -------------------------------
>  1 file changed, 31 deletions(-)
> 
> diff --git a/drivers/block/skd_main.c b/drivers/block/skd_main.c
> index a962b4551bed..da7aac5335d9 100644
> --- a/drivers/block/skd_main.c
> +++ b/drivers/block/skd_main.c

[...]
>  static int skd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  {
>  	int i;
>  	int rc = 0;
> -	char pci_str[32];
>  	struct skd_device *skdev;
> 
>  	dev_dbg(&pdev->dev, "vendor=%04X device=%04x\n", pdev->vendor,
> @@ -3201,8 +3172,6 @@ static int skd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  		goto err_out_regions;
>  	}
> 
> -	skd_pci_info(skdev, pci_str);
> -	dev_info(&pdev->dev, "%s 64bit\n", pci_str);

Replace these 2 lines with:

	pcie_print_link_status(pdev);

And the link speed information will be printed.



-- 
Damien Le Moal
Western Digital Research