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

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Message-ID: <ea91140a-d0df-4efd-aef8-34f00b82cf74@linux.microsoft.com>
Date: Wed, 15 May 2024 09:34:09 -0700
From: Roman Kisel <romank@...ux.microsoft.com>
To: Saurabh Singh Sengar <ssengar@...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 5/15/2024 2:48 AM, Saurabh Singh Sengar wrote:
> 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:"
> 
Thanks!

>>
>> 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.
> 
Fewer line breaks would make this look nicer, let me know if you had any 
particular style in mind.

>>   
>>   	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
>>

-- 
Thank you,
Roman