linux-kernel - RE: [PATCH hyperv-next v5 08/11] Drivers: hv: vmbus: Get the IRQ number from DeviceTree

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:
 <SN6PR02MB415732A17E3EE6A4966B853ED4D62@SN6PR02MB4157.namprd02.prod.outlook.com>
Date: Mon, 10 Mar 2025 23:09:34 +0000
From: Michael Kelley <mhklinux@...look.com>
To: Roman Kisel <romank@...ux.microsoft.com>, "arnd@...db.de" <arnd@...db.de>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>, "bp@...en8.de" <bp@...en8.de>,
	"catalin.marinas@....com" <catalin.marinas@....com>, "conor+dt@...nel.org"
	<conor+dt@...nel.org>, "dave.hansen@...ux.intel.com"
	<dave.hansen@...ux.intel.com>, "decui@...rosoft.com" <decui@...rosoft.com>,
	"haiyangz@...rosoft.com" <haiyangz@...rosoft.com>, "hpa@...or.com"
	<hpa@...or.com>, "joey.gouly@....com" <joey.gouly@....com>,
	"krzk+dt@...nel.org" <krzk+dt@...nel.org>, "kw@...ux.com" <kw@...ux.com>,
	"kys@...rosoft.com" <kys@...rosoft.com>, "lenb@...nel.org" <lenb@...nel.org>,
	"lpieralisi@...nel.org" <lpieralisi@...nel.org>,
	"manivannan.sadhasivam@...aro.org" <manivannan.sadhasivam@...aro.org>,
	"mark.rutland@....com" <mark.rutland@....com>, "maz@...nel.org"
	<maz@...nel.org>, "mingo@...hat.com" <mingo@...hat.com>,
	"oliver.upton@...ux.dev" <oliver.upton@...ux.dev>, "rafael@...nel.org"
	<rafael@...nel.org>, "robh@...nel.org" <robh@...nel.org>,
	"ssengar@...ux.microsoft.com" <ssengar@...ux.microsoft.com>,
	"sudeep.holla@....com" <sudeep.holla@....com>, "suzuki.poulose@....com"
	<suzuki.poulose@....com>, "tglx@...utronix.de" <tglx@...utronix.de>,
	"wei.liu@...nel.org" <wei.liu@...nel.org>, "will@...nel.org"
	<will@...nel.org>, "yuzenghui@...wei.com" <yuzenghui@...wei.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"kvmarm@...ts.linux.dev" <kvmarm@...ts.linux.dev>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-hyperv@...r.kernel.org"
	<linux-hyperv@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-pci@...r.kernel.org"
	<linux-pci@...r.kernel.org>, "x86@...nel.org" <x86@...nel.org>
CC: "apais@...rosoft.com" <apais@...rosoft.com>, "benhill@...rosoft.com"
	<benhill@...rosoft.com>, "bperkins@...rosoft.com" <bperkins@...rosoft.com>,
	"sunilmut@...rosoft.com" <sunilmut@...rosoft.com>
Subject: RE: [PATCH hyperv-next v5 08/11] Drivers: hv: vmbus: Get the IRQ
 number from DeviceTree

From: Roman Kisel <romank@...ux.microsoft.com> Sent: Friday, March 7, 2025 2:03 PM
> 
> The VMBus driver uses ACPI for interrupt assignment on
> arm64 hence it won't function in the VTL mode where only
> DeviceTree can be used.
> 
> Update the VMBus driver to discover interrupt configuration
> from DT.
> 
> Signed-off-by: Roman Kisel <romank@...ux.microsoft.com>
> Reviewed-by: Michael Kelley <mhklinux@...look.com>
> ---
>  drivers/hv/vmbus_drv.c | 36 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 36 insertions(+)
> 
> diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
> index 75eb1390b45c..c8474b48dcd2 100644
> --- a/drivers/hv/vmbus_drv.c
> +++ b/drivers/hv/vmbus_drv.c
> @@ -2345,6 +2345,36 @@ static int vmbus_acpi_add(struct platform_device *pdev)
>  }
>  #endif
> 
> +static int __maybe_unused vmbus_set_irq(struct platform_device *pdev)
> +{
> +	struct irq_data *data;
> +	int irq;
> +	irq_hw_number_t hwirq;
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq == 0) {
> +		pr_err("VMBus interrupt mapping failure\n");
> +		return -EINVAL;
> +	}
> +	if (irq < 0) {
> +		pr_err("VMBus interrupt data can't be read from DeviceTree, error %d\n", irq);
> +		return irq;
> +	}
> +
> +	data = irq_get_irq_data(irq);
> +	if (!data) {
> +		pr_err("No interrupt data for VMBus virq %d\n", irq);
> +		return -ENODEV;
> +	}
> +	hwirq = irqd_to_hwirq(data);
> +
> +	vmbus_irq = irq;
> +	vmbus_interrupt = hwirq;
> +	pr_debug("VMBus virq %d, hwirq %d\n", vmbus_irq, vmbus_interrupt);
> +
> +	return 0;
> +}
> +
>  static int vmbus_device_add(struct platform_device *pdev)
>  {
>  	struct resource **cur_res = &hyperv_mmio;
> @@ -2359,6 +2389,12 @@ static int vmbus_device_add(struct platform_device *pdev)
>  	if (ret)
>  		return ret;
> 
> +#ifndef HYPERVISOR_CALLBACK_VECTOR
> +	ret = vmbus_set_irq(pdev);
> +	if (ret)
> +		return ret;
> +#endif
> +
>  	for_each_of_range(&parser, &range) {
>  		struct resource *res;
> 
> --
> 2.43.0
> 

Modulo Arnd's suggestion for avoiding the #ifndef, 

Reviewed-by: Michael Kelley <mhklinux@...look.com>