linux-kernel - Re: [PATCH v2 6/6] drivers/pci/hyperv/arm64: vPCI MSI IRQ domain from DT

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Date: Wed, 15 May 2024 02:48:20 -0700
From: Saurabh Singh Sengar <ssengar@...ux.microsoft.com>
To: Roman Kisel <romank@...ux.microsoft.com>
Cc: arnd@...db.de, bhelgaas@...gle.com, bp@...en8.de,
	catalin.marinas@....com, dave.hansen@...ux.intel.com,
	decui@...rosoft.com, haiyangz@...rosoft.com, hpa@...or.com,
	kw@...ux.com, kys@...rosoft.com, lenb@...nel.org,
	lpieralisi@...nel.org, mingo@...hat.com, mhklinux@...look.com,
	rafael@...nel.org, robh@...nel.org, tglx@...utronix.de,
	wei.liu@...nel.org, will@...nel.org, linux-acpi@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, x86@...nel.org, ssengar@...rosoft.com,
	sunilmut@...rosoft.com, vdso@...bites.dev
Subject: Re: [PATCH v2 6/6] drivers/pci/hyperv/arm64: vPCI MSI IRQ domain
 from DT

On Tue, May 14, 2024 at 03:43:53PM -0700, Roman Kisel wrote:
> The hyperv-pci driver uses ACPI for MSI IRQ domain configuration
> on arm64 thereby it won't be able to do that in the VTL mode where
> only DeviceTree can be used.
> 
> Update the hyperv-pci driver to discover interrupt configuration
> via DeviceTree.

Subject prefix should be "PCI: hv:"

> 
> Signed-off-by: Roman Kisel <romank@...ux.microsoft.com>
> ---
>  drivers/pci/controller/pci-hyperv.c | 13 ++++++++++---
>  include/linux/acpi.h                |  9 +++++++++
>  2 files changed, 19 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
> index 1eaffff40b8d..ccc2b54206f4 100644
> --- a/drivers/pci/controller/pci-hyperv.c
> +++ b/drivers/pci/controller/pci-hyperv.c
> @@ -906,9 +906,16 @@ static int hv_pci_irqchip_init(void)
>  	 * way to ensure that all the corresponding devices are also gone and
>  	 * no interrupts will be generated.
>  	 */
> -	hv_msi_gic_irq_domain = acpi_irq_create_hierarchy(0, HV_PCI_MSI_SPI_NR,
> -							  fn, &hv_pci_domain_ops,
> -							  chip_data);
> +	if (acpi_disabled)
> +		hv_msi_gic_irq_domain = irq_domain_create_hierarchy(
> +			irq_find_matching_fwnode(fn, DOMAIN_BUS_ANY),
> +			0, HV_PCI_MSI_SPI_NR,
> +			fn, &hv_pci_domain_ops,
> +			chip_data);
> +	else
> +		hv_msi_gic_irq_domain = acpi_irq_create_hierarchy(0, HV_PCI_MSI_SPI_NR,
> +			fn, &hv_pci_domain_ops,
> +			chip_data);

Upto 100 characters per line are supported now, we can have less
line breaks.

>  
>  	if (!hv_msi_gic_irq_domain) {
>  		pr_err("Failed to create Hyper-V arm64 vPCI MSI IRQ domain\n");
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index b7165e52b3c6..498cbb2c40a1 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -1077,6 +1077,15 @@ static inline bool acpi_sleep_state_supported(u8 sleep_state)
>  	return false;
>  }
>  
> +static inline struct irq_domain *acpi_irq_create_hierarchy(unsigned int flags,
> +					     unsigned int size,
> +					     struct fwnode_handle *fwnode,
> +					     const struct irq_domain_ops *ops,
> +					     void *host_data)
> +{
> +	return NULL;
> +}
> +
>  #endif	/* !CONFIG_ACPI */
>  
>  extern void arch_post_acpi_subsys_init(void);
> -- 
> 2.45.0
>