netdev - Re: [PATCH v6 6/7] PCI: pciehp: Rely on `link_active

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Message-ID: <20230213135327.GA29595@wunner.de>
Date:   Mon, 13 Feb 2023 14:53:27 +0100
From:   Lukas Wunner <lukas@...ner.de>
To:     "Maciej W. Rozycki" <macro@...am.me.uk>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Mahesh J Salgaonkar <mahesh@...ux.ibm.com>,
        Oliver O'Halloran <oohall@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Stefan Roese <sr@...x.de>, Jim Wilson <wilson@...iptree.org>,
        David Abdurachmanov <david.abdurachmanov@...il.com>,
        Pali Rohár <pali@...nel.org>,
        linux-pci@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 6/7] PCI: pciehp: Rely on `link_active_reporting'

On Sun, Feb 05, 2023 at 03:49:21PM +0000, Maciej W. Rozycki wrote:
> Use `link_active_reporting' to determine whether Data Link Layer Link 
> Active Reporting is available rather than re-retrieving the capability.
> 
> Signed-off-by: Maciej W. Rozycki <macro@...am.me.uk>

Reviewed-by: Lukas Wunner <lukas@...ner.de>

I believe this should work without the preceding patches in the series,
hence can be applied independently.

Thanks,

Lukas

>  drivers/pci/hotplug/pciehp_hpc.c |    7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> linux-pcie-link-active-reporting-hpc.diff
> Index: linux-macro/drivers/pci/hotplug/pciehp_hpc.c
> ===================================================================
> --- linux-macro.orig/drivers/pci/hotplug/pciehp_hpc.c
> +++ linux-macro/drivers/pci/hotplug/pciehp_hpc.c
> @@ -984,7 +984,7 @@ static inline int pcie_hotplug_depth(str
>  struct controller *pcie_init(struct pcie_device *dev)
>  {
>  	struct controller *ctrl;
> -	u32 slot_cap, slot_cap2, link_cap;
> +	u32 slot_cap, slot_cap2;
>  	u8 poweron;
>  	struct pci_dev *pdev = dev->port;
>  	struct pci_bus *subordinate = pdev->subordinate;
> @@ -1030,9 +1030,6 @@ struct controller *pcie_init(struct pcie
>  	if (dmi_first_match(inband_presence_disabled_dmi_table))
>  		ctrl->inband_presence_disabled = 1;
>  
> -	/* Check if Data Link Layer Link Active Reporting is implemented */
> -	pcie_capability_read_dword(pdev, PCI_EXP_LNKCAP, &link_cap);
> -
>  	/* Clear all remaining event bits in Slot Status register. */
>  	pcie_capability_write_word(pdev, PCI_EXP_SLTSTA,
>  		PCI_EXP_SLTSTA_ABP | PCI_EXP_SLTSTA_PFD |
> @@ -1051,7 +1048,7 @@ struct controller *pcie_init(struct pcie
>  		FLAG(slot_cap, PCI_EXP_SLTCAP_EIP),
>  		FLAG(slot_cap, PCI_EXP_SLTCAP_NCCS),
>  		FLAG(slot_cap2, PCI_EXP_SLTCAP2_IBPD),
> -		FLAG(link_cap, PCI_EXP_LNKCAP_DLLLARC),
> +		FLAG(pdev->link_active_reporting, true),
>  		pdev->broken_cmd_compl ? " (with Cmd Compl erratum)" : "");
>  
>  	/*