[PATCH] ARM: add PCI hotplug support

[PATCH] ARM: add PCI hotplug support

[Ben Dooks]

Hotplug on PCIe should work with ARM, however the necessary
PCIe hotplug is not availale as the menu items for PCI hotplug
have not been included.

Add the include of PCI hotplug support to the ARM main Kconfig
so that it can be selected.

The only issue that was found during this is that the PCI code
did not assign interrupts properly to newly probed devices. This
will need to be fixed for any interrupt capable devices.

This has been tested on a Marvell 88F6281 with a TI XIO3130
PCIe bridge (with hotplug enabled) and fixes for IRQ assignment
added.

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
--
CC: Linux ARM Kernel list <linux-arm-kernel@lists.infradead.org>
CC: Russell King <linux@arm.linux.org.uk>
CC: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
CC: Bjorn Helgaas <bhelgaas@google.com>
CC: Linux PCI List <linux-pci@vger.kernel.org>
---
 arch/arm/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 9f1f09a..4574ab4 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1302,6 +1302,7 @@ config PCI_HOST_ITE8152
 	select DMABOUNCE
 
 source "drivers/pci/Kconfig"
+source "drivers/pci/hotplug/Kconfig"
 source "drivers/pci/pcie/Kconfig"
 
 source "drivers/pcmcia/Kconfig"
-- 
2.1.4

Re: [PATCH] ARM: add PCI hotplug support

[Bjorn Helgaas]

On Tue, Mar 17, 2015 at 12:22:32PM +0000, Ben Dooks wrote:
> Hotplug on PCIe should work with ARM, however the necessary
> PCIe hotplug is not availale as the menu items for PCI hotplug

"available"

> have not been included.
> 
> Add the include of PCI hotplug support to the ARM main Kconfig
> so that it can be selected.
> 
> The only issue that was found during this is that the PCI code
> did not assign interrupts properly to newly probed devices. This
> will need to be fixed for any interrupt capable devices.

Yep, this is a known PCI problem, at least if you're referring to
the fact that pci_fixup_irqs() only happens for devices present at
boot-time.  I would love for somebody to fix that generically.

I would also like to squash together the PCI, PCIe, and PCI hotplug Kconfig
options so arches would only have to include drivers/pci/Kconfig.

> This has been tested on a Marvell 88F6281 with a TI XIO3130
> PCIe bridge (with hotplug enabled) and fixes for IRQ assignment
> added.
> 
> Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>

I assume this will be handled via an ARM tree, but if you want it:

Acked-by: Bjorn Helgaas <bhelgaas@google.com>

> --
> CC: Linux ARM Kernel list <linux-arm-kernel@lists.infradead.org>
> CC: Russell King <linux@arm.linux.org.uk>
> CC: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
> CC: Bjorn Helgaas <bhelgaas@google.com>
> CC: Linux PCI List <linux-pci@vger.kernel.org>
> ---
>  arch/arm/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 9f1f09a..4574ab4 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -1302,6 +1302,7 @@ config PCI_HOST_ITE8152
>  	select DMABOUNCE
>  
>  source "drivers/pci/Kconfig"
> +source "drivers/pci/hotplug/Kconfig"
>  source "drivers/pci/pcie/Kconfig"
>  
>  source "drivers/pcmcia/Kconfig"
> -- 
> 2.1.4
>