[PATCH v2] PCI/MSI: Enable PCI_MSI_IRQ_DOMAIN support for Microblaze

[PATCH v2] PCI/MSI: Enable PCI_MSI_IRQ_DOMAIN support for Microblaze

[Michal Simek]

From: Kuldeep Dave <kuldeep.dave@xilinx.com>

Add Microblaze as an arch that supports PCI_MSI_IRQ_DOMAIN and add
generation of msi.h in the Microblaze arch.

The same change has been done by commit 251a44888183
("riscv: include generic support for MSI irqdomains")
and by commit 2a9af0273c1c
("PCI/MSI: Enable PCI_MSI_IRQ_DOMAIN support for RISC-V").

Signed-off-by: Kuldeep Dave <kuldeep.dave@xilinx.com>
Signed-off-by: Bharat Kumar Gogada <bharat.kumar.gogada@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---

Changes in v2:
- Squash patches together https://lkml.org/lkml/2019/10/8/277
  https://lkml.org/lkml/2019/10/8/283

Please take it directly via pci tree.
---
 arch/microblaze/include/asm/Kbuild | 1 +
 drivers/pci/Kconfig                | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/microblaze/include/asm/Kbuild b/arch/microblaze/include/asm/Kbuild
index e5c9170a07fc..83417105c00a 100644
--- a/arch/microblaze/include/asm/Kbuild
+++ b/arch/microblaze/include/asm/Kbuild
@@ -25,6 +25,7 @@ generic-y += local64.h
 generic-y += mcs_spinlock.h
 generic-y += mm-arch-hooks.h
 generic-y += mmiowb.h
+generic-y += msi.h
 generic-y += parport.h
 generic-y += percpu.h
 generic-y += preempt.h
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index a304f5ea11b9..9d259372fbfd 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -52,7 +52,7 @@ config PCI_MSI
 	   If you don't know what to do here, say Y.
 
 config PCI_MSI_IRQ_DOMAIN
-	def_bool ARC || ARM || ARM64 || X86 || RISCV
+	def_bool ARC || ARM || ARM64 || X86 || RISCV || MICROBLAZE
 	depends on PCI_MSI
 	select GENERIC_MSI_IRQ_DOMAIN
 
-- 
2.17.1

Re: [PATCH v2] PCI/MSI: Enable PCI_MSI_IRQ_DOMAIN support for Microblaze

[Christoph Hellwig]

> diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
> index a304f5ea11b9..9d259372fbfd 100644
> --- a/drivers/pci/Kconfig
> +++ b/drivers/pci/Kconfig
> @@ -52,7 +52,7 @@ config PCI_MSI
>  	   If you don't know what to do here, say Y.
>  
>  config PCI_MSI_IRQ_DOMAIN
> -	def_bool ARC || ARM || ARM64 || X86 || RISCV
> +	def_bool ARC || ARM || ARM64 || X86 || RISCV || MICROBLAZE

Can you find out what the actual dependency is so that we can
automatically enabled this instead of the weird arch list?

Re: [PATCH v2] PCI/MSI: Enable PCI_MSI_IRQ_DOMAIN support for Microblaze

[Bjorn Helgaas]

On Tue, Oct 08, 2019 at 08:46:52AM -0700, Christoph Hellwig wrote:
> > diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
> > index a304f5ea11b9..9d259372fbfd 100644
> > --- a/drivers/pci/Kconfig
> > +++ b/drivers/pci/Kconfig
> > @@ -52,7 +52,7 @@ config PCI_MSI
> >  	   If you don't know what to do here, say Y.
> >  
> >  config PCI_MSI_IRQ_DOMAIN
> > -	def_bool ARC || ARM || ARM64 || X86 || RISCV
> > +	def_bool ARC || ARM || ARM64 || X86 || RISCV || MICROBLAZE
> 
> Can you find out what the actual dependency is so that we can
> automatically enabled this instead of the weird arch list?

Hi Michal, I'll wait for your response on whether it's feasible to do
something smarter than listing every arch here.  Please ping here or
post a v3; since I marked this patch "Changed Requested" in patchwork,
it's fallen off my to-do list.

Bjorn

Re: [PATCH v2] PCI/MSI: Enable PCI_MSI_IRQ_DOMAIN support for Microblaze

[Michal Simek]

Hi Bjorn,

On 15. 10. 19 1:23, Bjorn Helgaas wrote:
> On Tue, Oct 08, 2019 at 08:46:52AM -0700, Christoph Hellwig wrote:
>>> diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
>>> index a304f5ea11b9..9d259372fbfd 100644
>>> --- a/drivers/pci/Kconfig
>>> +++ b/drivers/pci/Kconfig
>>> @@ -52,7 +52,7 @@ config PCI_MSI
>>>  	   If you don't know what to do here, say Y.
>>>  
>>>  config PCI_MSI_IRQ_DOMAIN
>>> -	def_bool ARC || ARM || ARM64 || X86 || RISCV
>>> +	def_bool ARC || ARM || ARM64 || X86 || RISCV || MICROBLAZE
>>
>> Can you find out what the actual dependency is so that we can
>> automatically enabled this instead of the weird arch list?
> 
> Hi Michal, I'll wait for your response on whether it's feasible to do
> something smarter than listing every arch here.  Please ping here or
> post a v3; since I marked this patch "Changed Requested" in patchwork,
> it's fallen off my to-do list.

I was waiting more for you to comment this. I was expecting that the
same question came last time when RISCV was added.
I am happy to investigate more about it but definitely some your input
would help.

Thanks,
Michal

Re: [PATCH v2] PCI/MSI: Enable PCI_MSI_IRQ_DOMAIN support for Microblaze

[Palmer Dabbelt]

On Mon, 14 Oct 2019 22:59:07 PDT (-0700), michal.simek@xilinx.com wrote:
> Hi Bjorn,
>
> On 15. 10. 19 1:23, Bjorn Helgaas wrote:
>> On Tue, Oct 08, 2019 at 08:46:52AM -0700, Christoph Hellwig wrote:
>>>> diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
>>>> index a304f5ea11b9..9d259372fbfd 100644
>>>> --- a/drivers/pci/Kconfig
>>>> +++ b/drivers/pci/Kconfig
>>>> @@ -52,7 +52,7 @@ config PCI_MSI
>>>>  	   If you don't know what to do here, say Y.
>>>>
>>>>  config PCI_MSI_IRQ_DOMAIN
>>>> -	def_bool ARC || ARM || ARM64 || X86 || RISCV
>>>> +	def_bool ARC || ARM || ARM64 || X86 || RISCV || MICROBLAZE
>>>
>>> Can you find out what the actual dependency is so that we can
>>> automatically enabled this instead of the weird arch list?
>>
>> Hi Michal, I'll wait for your response on whether it's feasible to do
>> something smarter than listing every arch here.  Please ping here or
>> post a v3; since I marked this patch "Changed Requested" in patchwork,
>> it's fallen off my to-do list.
>
> I was waiting more for you to comment this. I was expecting that the
> same question came last time when RISCV was added.
> I am happy to investigate more about it but definitely some your input
> would help.

Sorry: we usually try to do things the right way but it looks like this got 
lost in the shuffle.  It really doesn't look like there's any 
architecture-specific code implementation on our end:

    commit 251a44888183003b0380df184835a2c00bfa39d7
    Author: Wesley Terpstra <wesley@sifive.com>
    Date:   Mon May 20 10:29:26 2019 -0700
    
        riscv: include generic support for MSI irqdomains
    
        Some RISC-V systems include PCIe host controllers that support PCIe
        message-signaled interrupts.  For this to work on Linux, we need to
        enable PCI_MSI_IRQ_DOMAIN and define struct msi_alloc_info.  Support
        for the latter is enabled by including the architecture-generic msi.h
        include.
    
        Signed-off-by: Wesley Terpstra <wesley@sifive.com>
        [paul.walmsley@sifive.com: split initial patch into one arch/riscv
         patch and one drivers/pci patch]
        Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
    
    diff --git a/arch/riscv/include/asm/Kbuild b/arch/riscv/include/asm/Kbuild
    index 1efaeddf1e4b..16970f246860 100644
    --- a/arch/riscv/include/asm/Kbuild
    +++ b/arch/riscv/include/asm/Kbuild
    @@ -22,6 +22,7 @@ generic-y += kvm_para.h
     generic-y += local.h
     generic-y += local64.h
     generic-y += mm-arch-hooks.h
    +generic-y += msi.h
     generic-y += percpu.h
     generic-y += preempt.h
     generic-y += sections.h

I bet that dropping the architectures and adding msi.h everywhere it's not 
listed will at least get this building.  I'll give

    diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
    index a304f5ea11b9..77c1428cd945 100644
    --- a/drivers/pci/Kconfig
    +++ b/drivers/pci/Kconfig
    @@ -52,7 +52,7 @@ config PCI_MSI
               If you don't know what to do here, say Y.
    
     config PCI_MSI_IRQ_DOMAIN
    -       def_bool ARC || ARM || ARM64 || X86 || RISCV
    +       def_bool y
            depends on PCI_MSI
            select GENERIC_MSI_IRQ_DOMAIN
    
a build everywhere to see what falls out.