[PATCH] riscv: include generic support for MSI irqdomains

[PATCH] riscv: include generic support for MSI irqdomains

[Paul Walmsley]

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.

Based on a patch from Wesley Terpstra <wesley@sifive.com>:

https://github.com/riscv/riscv-linux/commit/7d55f38fb79f459d2e88bcee7e147796400cafa8

Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Wesley Terpstra <wesley@sifive.com>
---
 arch/riscv/include/asm/Kbuild | 1 +
 drivers/pci/Kconfig           | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/include/asm/Kbuild b/arch/riscv/include/asm/Kbuild
index 3d019e062c6f..b0a9fa34be5a 100644
--- a/arch/riscv/include/asm/Kbuild
+++ b/arch/riscv/include/asm/Kbuild
@@ -20,6 +20,7 @@ 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
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index 2ab92409210a..beb3408a0272 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
+	def_bool ARC || ARM || ARM64 || X86 || RISCV
 	depends on PCI_MSI
 	select GENERIC_MSI_IRQ_DOMAIN
 
-- 
2.20.1


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Re: [PATCH] riscv: include generic support for MSI irqdomains

[Christoph Hellwig]

On Mon, May 20, 2019 at 11:25:28AM -0700, Paul Walmsley wrote:
> 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.
> 
> Based on a patch from Wesley Terpstra <wesley@sifive.com>:
> 
> https://github.com/riscv/riscv-linux/commit/7d55f38fb79f459d2e88bcee7e147796400cafa8
> 
> Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
> Signed-off-by: Paul Walmsley <paul@pwsan.com>
> Cc: Wesley Terpstra <wesley@sifive.com>

Well, this is very much Wes' patch as-is.  It should probably be
attributed to him and you should ask for his signoff.

Otherwise this looks fine:

Reviewed-by: Christoph Hellwig <hch@lst.de>

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Re: [PATCH] riscv: include generic support for MSI irqdomains

[Paul Walmsley]

On Mon, 20 May 2019, Christoph Hellwig wrote:

> On Mon, May 20, 2019 at 11:25:28AM -0700, Paul Walmsley wrote:
> > 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.
> > 
> > Based on a patch from Wesley Terpstra <wesley@sifive.com>:
> > 
> > https://github.com/riscv/riscv-linux/commit/7d55f38fb79f459d2e88bcee7e147796400cafa8
> > 
> > Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
> > Signed-off-by: Paul Walmsley <paul@pwsan.com>
> > Cc: Wesley Terpstra <wesley@sifive.com>
> 
> Well, this is very much Wes' patch as-is.  It should probably be
> attributed to him and you should ask for his signoff.

Yeah.  There aren't many other ways to do it.

Wes, care to reply with your Signed-off-by: ? 


- Paul

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Re: [PATCH] riscv: include generic support for MSI irqdomains

[Wesley Terpstra]

Signed.


On Tue, May 21, 2019 at 1:11 AM Paul Walmsley <paul.walmsley@sifive.com> wrote:
>
> On Mon, 20 May 2019, Christoph Hellwig wrote:
>
> > On Mon, May 20, 2019 at 11:25:28AM -0700, Paul Walmsley wrote:
> > > 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.
> > >
> > > Based on a patch from Wesley Terpstra <wesley@sifive.com>:
> > >
> > > https://github.com/riscv/riscv-linux/commit/7d55f38fb79f459d2e88bcee7e147796400cafa8
> > >
> > > Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
> > > Signed-off-by: Paul Walmsley <paul@pwsan.com>
> > > Cc: Wesley Terpstra <wesley@sifive.com>
> >
> > Well, this is very much Wes' patch as-is.  It should probably be
> > attributed to him and you should ask for his signoff.
>
> Yeah.  There aren't many other ways to do it.
>
> Wes, care to reply with your Signed-off-by: ?
>
>
> - Paul

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Re: [PATCH] riscv: include generic support for MSI irqdomains

[Paul Walmsley]

On Tue, 21 May 2019, Wesley Terpstra wrote:

> Signed.

Thanks, will repost with that and add the PCI folks also

- Paul

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