linux-kernel - Re: [PATCH] PCI: dw-rockchip: Skip waiting for link up

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250113192720.GA414640@bhelgaas>
Date: Mon, 13 Jan 2025 13:27:20 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: Niklas Cassel <cassel@...nel.org>
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Damien Le Moal <dlemoal@...nel.org>,
	Anand Moon <linux.amoon@...il.com>, linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Krishna chaitanya chundru <quic_krichai@...cinc.com>
Subject: Re: [PATCH] PCI: dw-rockchip: Skip waiting for link up

On Mon, Jan 13, 2025 at 11:59:34AM +0100, Niklas Cassel wrote:
> The Root Complex specific device tree binding for pcie-dw-rockchip has the
> 'sys' interrupt marked as required.
> 
> The driver requests the 'sys' IRQ unconditionally, and errors out if not
> provided.
> 
> Thus, we can unconditionally set use_linkup_irq before calling
> dw_pcie_host_init().
> 
> This will skip the wait for link up (since the bus will be enumerated once
> the link up IRQ is triggered), which reduces the bootup time.
> 
> Signed-off-by: Niklas Cassel <cassel@...nel.org>

Thanks!  I was just reviewing the addition of your dll_link_up IRQ
handler, and was about to ask whether you wanted to set use_linkup_irq
to avoid the wait, but here's the patch already :)

I think I'll sort out the branches so the dll_link_up IRQ handler,
this patch, and the corresponding qcom change go on the same branch as
Krishna's patch to skip waiting if pp->use_linkup_irq.

> ---
>  drivers/pci/controller/dwc/pcie-dw-rockchip.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> index 1170e1107508bd793b610949b0afe98516c177a4..62034affb95fbb965aad3cebc613a83e31c90aee 100644
> --- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> +++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> @@ -435,6 +435,7 @@ static int rockchip_pcie_configure_rc(struct rockchip_pcie *rockchip)
>  
>  	pp = &rockchip->pci.pp;
>  	pp->ops = &rockchip_pcie_host_ops;
> +	pp->use_linkup_irq = true;
>  
>  	return dw_pcie_host_init(pp);
>  }
> 
> ---
> base-commit: 2adda4102931b152f35d054055497631ed97fe73
> change-id: 20250113-rockchip-no-wait-403ffbc42313
> 
> Best regards,
> -- 
> Niklas Cassel <cassel@...nel.org>
>