Re: [PATCH] irqchip: Select downstream irqchip drivers for LoongArch CPU

[Marc Zyngier <maz@kernel.org>]

On Mon, 08 Aug 2022 09:53:19 +0100,
Huacai Chen <chenhuacai@loongson.cn> wrote:
> 
> LoongArch irqchips have a fixed hierarchy which currently can't be
> described by ACPI tables, so upstream irqchip drivers call downstream
> irqchip drivers' initialization directly. As a result, the top level
> (CPU-level) irqchip driver should explicitly select downstream drivers
> to avoid build errors.
> 
> Reported-by: kernel test robot <lkp@intel.com>
> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
> ---
>  drivers/irqchip/Kconfig | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
> index 66b9fa408bf2..2549daa859d6 100644
> --- a/drivers/irqchip/Kconfig
> +++ b/drivers/irqchip/Kconfig
> @@ -561,6 +561,11 @@ config IRQ_LOONGARCH_CPU
>  	select GENERIC_IRQ_CHIP
>  	select IRQ_DOMAIN
>  	select GENERIC_IRQ_EFFECTIVE_AFF_MASK
> +	select LOONGSON_LIOINTC
> +	select LOONGSON_EIOINTC
> +	select LOONGSON_PCH_PIC
> +	select LOONGSON_PCH_MSI
> +	select LOONGSON_PCH_LPC

This triggers tons of pretty bad compilation and configuration issues,
as PCI still isn't selectable, even in Linus' tree (see below). I'm
guessing you still have local patches that hide this issue.

Please test your patches on an upstream tree in the future.

	M.

<log>
$ make ARCH=loongarch CROSS_COMPILE=loongarch64-linux- -j 20 vmlinux
  SYNC    include/config/auto.conf.cmd

WARNING: unmet direct dependencies detected for LOONGSON_PCH_MSI
  Depends on [n]: MACH_LOONGSON64 [=y] && PCI [=n]
  Selected by [y]:
  - IRQ_LOONGARCH_CPU [=y]

WARNING: unmet direct dependencies detected for LOONGSON_PCH_MSI
  Depends on [n]: MACH_LOONGSON64 [=y] && PCI [=n]
  Selected by [y]:
  - IRQ_LOONGARCH_CPU [=y]

WARNING: unmet direct dependencies detected for LOONGSON_PCH_MSI
  Depends on [n]: MACH_LOONGSON64 [=y] && PCI [=n]
  Selected by [y]:
[...]
drivers/irqchip/irq-loongson-pch-msi.c:88:15: error: variable 'pch_msi_domain_info' has initializer but incomplete type
   88 | static struct msi_domain_info pch_msi_domain_info = {
      |               ^~~~~~~~~~~~~~~
drivers/irqchip/irq-loongson-pch-msi.c:89:10: error: 'struct msi_domain_info' has no member named 'flags'
   89 |         .flags  = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
      |          ^~~~~
  CC      mm/page-writeback.o
  CC      io_uring/advise.o
drivers/irqchip/irq-loongson-pch-msi.c:89:19: error: 'MSI_FLAG_USE_DEF_DOM_OPS' undeclared here (not in a function)
   89 |         .flags  = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
      |                   ^~~~~~~~~~~~~~~~~~~~~~~~
  CC      fs/char_dev.o
  CC      fs/stat.o
drivers/irqchip/irq-loongson-pch-msi.c:89:46: error: 'MSI_FLAG_USE_DEF_CHIP_OPS' undeclared here (not in a function)
   89 |         .flags  = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
      |                                              ^~~~~~~~~~~~~~~~~~~~~~~~~
  CC      security/security.o
  AS      arch/loongarch/kernel/switch.o
  CC      kernel/softirq.o
drivers/irqchip/irq-loongson-pch-msi.c:90:19: error: 'MSI_FLAG_MULTI_PCI_MSI' undeclared here (not in a function)
   90 |                   MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX,
      |                   ^~~~~~~~~~~~~~~~~~~~~~
  CC      crypto/dh_helper.o
  CC      arch/loongarch/kernel/elf.o
drivers/irqchip/irq-loongson-pch-msi.c:90:44: error: 'MSI_FLAG_PCI_MSIX' undeclared here (not in a function)
   90 |                   MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX,
      |                                            ^~~~~~~~~~~~~~~~~
drivers/irqchip/irq-loongson-pch-msi.c:89:19: warning: excess elements in struct initializer
   89 |         .flags  = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
      |                   ^~~~~~~~~~~~~~~~~~~~~~~~
drivers/irqchip/irq-loongson-pch-msi.c:89:19: note: (near initialization for 'pch_msi_domain_info')
drivers/irqchip/irq-loongson-pch-msi.c:91:10: error: 'struct msi_domain_info' has no member named 'chip'
   91 |         .chip   = &pch_msi_irq_chip,
      |          ^~~~
drivers/irqchip/irq-loongson-pch-msi.c:91:19: warning: excess elements in struct initializer
   91 |         .chip   = &pch_msi_irq_chip,
      |                   ^
drivers/irqchip/irq-loongson-pch-msi.c:91:19: note: (near initialization for 'pch_msi_domain_info')
  CC      sound/core/device.o
  CC      drivers/gpio/gpiolib-sysfs.o
  CC      io_uring/filetable.o
drivers/irqchip/irq-loongson-pch-msi.c: In function 'pch_msi_init_domains':
drivers/irqchip/irq-loongson-pch-msi.c:178:22: error: implicit declaration of function 'pci_msi_create_irq_domain'; did you mean 'pci_msi_get_device_domain'? [-Werror=implicit-function-declaration]
  178 |         msi_domain = pci_msi_create_irq_domain(domain_handle,
      |                      ^~~~~~~~~~~~~~~~~~~~~~~~~
      |                      pci_msi_get_device_domain
drivers/irqchip/irq-loongson-pch-msi.c:178:20: warning: assignment to 'struct irq_domain *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
  178 |         msi_domain = pci_msi_create_irq_domain(domain_handle,
      |                    ^
drivers/irqchip/irq-loongson-pch-msi.c: At top level:
drivers/irqchip/irq-loongson-pch-msi.c:88:31: error: storage size of 'pch_msi_domain_info' isn't known
   88 | static struct msi_domain_info pch_msi_domain_info = {
      |                               ^~~~~~~~~~~~~~~~~~~
</log>

-- 
Without deviation from the norm, progress is not possible.