Re: [PATCH v5 08/17] ACPI: pci_link: Clear the dependencies after probe

[Bjorn Helgaas <helgaas@kernel.org>]

On Wed, May 01, 2024 at 05:47:33PM +0530, Sunil V L wrote:
> RISC-V platforms need to use dependencies between PCI host bridge, Link
> devices and the interrupt controllers to ensure probe order. The
> dependency is like below.
> 
> Interrupt controller <-- Link Device <-- PCI Host bridge.
> 
> If there is no dependency added between Link device and PCI Host Bridge,
> then the PCI end points can get probed prior to link device, unable to
> get mapping for INTx.
> 
> So, add the link device's HID to dependency honor list and also clear it
> after its probe.
> 
> Since this is required only for architectures like RISC-V, enable this
> code under a new config option and set this only in RISC-V.
> 
> Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
> ---
>  arch/riscv/Kconfig      | 1 +
>  drivers/acpi/Kconfig    | 3 +++
>  drivers/acpi/pci_link.c | 3 +++
>  drivers/acpi/scan.c     | 1 +
>  4 files changed, 8 insertions(+)
> 
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index f961449ca077..f7a36d79ff1a 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -14,6 +14,7 @@ config RISCV
>  	def_bool y
>  	select ACPI_GENERIC_GSI if ACPI
>  	select ACPI_REDUCED_HARDWARE_ONLY if ACPI
> +	select ARCH_ACPI_DEFERRED_GSI if ACPI
>  	select ARCH_DMA_DEFAULT_COHERENT
>  	select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION
>  	select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
> index e3a7c2aedd5f..ebec1707f662 100644
> --- a/drivers/acpi/Kconfig
> +++ b/drivers/acpi/Kconfig
> @@ -587,6 +587,9 @@ config ACPI_PRMT
>  	  substantially increase computational overhead related to the
>  	  initialization of some server systems.
>  
> +config ARCH_ACPI_DEFERRED_GSI
> +	bool
> +
>  endif	# ACPI
>  
>  config X86_PM_TIMER
> diff --git a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c
> index aa1038b8aec4..48cdcedafad6 100644
> --- a/drivers/acpi/pci_link.c
> +++ b/drivers/acpi/pci_link.c
> @@ -748,6 +748,9 @@ static int acpi_pci_link_add(struct acpi_device *device,
>  	if (result)
>  		kfree(link);
>  
> +	if (IS_ENABLED(CONFIG_ARCH_ACPI_DEFERRED_GSI))
> +		acpi_dev_clear_dependencies(device);

This is really a question for Rafael, but it doesn't seem right that
this completely depends on a config option.

Is there a reason this wouldn't work for all architectures, i.e., what
would happen if you just called acpi_dev_clear_dependencies()
unconditionally?

> +
>  	return result < 0 ? result : 1;
>  }
>  
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index 3eeb4ce39fcc..67677a6ff8e3 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -834,6 +834,7 @@ static const char * const acpi_honor_dep_ids[] = {
>  	"INTC10CF", /* IVSC (MTL) driver must be loaded to allow i2c access to camera sensors */
>  	"RSCV0001", /* RISC-V PLIC */
>  	"RSCV0002", /* RISC-V APLIC */
> +	"PNP0C0F",  /* PCI Link Device */
>  	NULL
>  };
>  
> -- 
> 2.40.1
> 
> 

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