On Wed, Jun 10, 2015 at 04:54:57PM +0800, Jiang Liu wrote:
> Hi Bjorn,
> I have verified that this patch set could be applied to the
> mainstream kernel without dependency on other patches, so could you
> please help to merge it?
>
> This patch set introduces a mechanism to allocate PCI IRQ on demand and
> free it when not used anymore by hooking pci_device_probe() and
> pci_device_remove().
>
> It will be used to track IOAPIC pin usage on x86 so we could support
> IOAPIC hot-removal.
>
> The patch set passes Fengguang's 0day test suite.
>
> V2->V3:
> 1) Change the default pcibios_alloc_irq() to always return 0, as
> suggested by Bjorn.
> 2) Refine comments.
>
> V1->V2:
> 1) Refine pci_device_probe() to optimize for mainline code as suggested
> by Bjorn
> 2) Reorder patch set to put optional patch as the last (Patch 4)
>
>
> Jiang Liu (4):
> PCI: Add hooks to allocate/free IRQ resources when binding/unbinding
> driver
> PCI, x86: Allocate PCI IRQ on demand and free it when not used
> anymore
> PCI: Add helpers to manage pci_dev->irq and pci_dev->irq_managed
> PCI, MSI: Free legacy PCI IRQ when enabling MSI/MSI-X
Applied to pci/irq with the following changelogs for v4.3, thanks!
commit 890e4847587fcff5eb0438e90992ad7d2a261f33
Author: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
Date: Wed Jun 10 16:54:58 2015 +0800
PCI: Add pcibios_alloc_irq() and pcibios_free_irq()
Add pcibios_alloc_irq() and pcibios_free_irq(), which are called when
binding/unbinding PCI device drivers.
PCI arch code may implement these to manage IRQ resources for hotplugged
devices.
[bhelgaas: changelog]
Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
commit 991de2e59090e55c65a7f59a049142e3c480f7bd
Author: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
Date: Wed Jun 10 16:54:59 2015 +0800
PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq()
To support IOAPIC hotplug, we need to allocate PCI IRQ resources on demand
and free them when not used anymore.
Implement pcibios_alloc_irq() and pcibios_free_irq() to dynamically
allocate and free PCI IRQs.
Remove mp_should_keep_irq(), which is no longer used.
[bhelgaas: changelog]
Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
commit 811a4e6fce09bc9239c664c6a1a53645a678c303
Author: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
Date: Wed Jun 10 16:55:00 2015 +0800
PCI: Add helpers to manage pci_dev->irq and pci_dev->irq_managed
Add pci_has_managed_irq(), pci_set_managed_irq(), and
pci_reset_managed_irq() to simplify code. No functional change.
[bhelgaas: changelog]
Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
commit 5f2269916b0e509f2926346b58209abfa8316143
Author: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
Date: Thu Jul 30 14:00:08 2015 -0500
PCI/MSI: Free legacy IRQ when enabling MSI/MSI-X
Once MSI/MSI-X is enabled by the device driver, a PCI device won't use
legacy IRQs again until MSI/MSI-X is disabled.
Call pcibios_free_irq() when enabling MSI/MSI-X and pcibios_alloc_irq()
when disabling MSI/MSI-X. This allows arch code to manage resources
associated with the legacy IRQ.
[bhelgaas: changelog]
Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
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