[Patch V1 0/6] Refine generic/PCI MSI irqodmian interfaces

[Jiang Liu <jiang.liu@linux.intel.com>]

This patch set is based on tip/irq/irqdomain and tries to refine
interfaces to support irqdomain for generic MSI and PCI MSI.

Patch 1 is just minor fixes for tip/irq/irqdomain.

Patch 2 introduces some helpers to hide struct msi_desc implementation
details, so later we could move msi_list from struct pci_dev into
struct device to enable generic MSI support.

Patch 3 introduces msi_domain_{alloc|free}_irqs() which generalize
pci_msi_domain_alloc_irqs() to support generic MSI.

Patch 4 introduces default data structures and callback implementations
to support msi_domain_alloc_irqs(), so reduce burden on generic MSI
users.

Patch 5 converts PCI MSI to use generic MSI interfaces, and also
implement default callbacks for PCI MSI.

Patch 6 introduces a mechanism to replace arch_setup_msi_irq()/
arch_setup_msi_irqs()/arch_teardown_msi_irq()/arch_teardown_msi_irqs().

With this patch set applied, the generic MSI and PCI MSI interfaces
are much easier to use. For extreme case, you only need to define
a "struct msi_domain_info" and don't need to implement any callbacks,
just using the default callbacks is OK:)

This patch set is also a preparation for:
1) Kill all weak functions in drivers/pci/msi.c
2) Implement support for non-PCI-compliant MSI device

It has been tested on x86 platforms, comments are welcomed!

Jiang Liu (6):
  PCI, MSI: Fix errors caused by commit e5f1a59c4e12
  PCI, MSI: Introduce helpers to hide struct msi_desc implemenation
    details
  genirq: Introduce msi_domain_{alloc|free}_irqs()
  genirq: Provide default callbacks for msi_domain_ops
  PCI, MSI: Refine irqdomain interfaces to simplify its usage
  PCI, MSI: Provide mechanism to alloc/free MSI/MSIX interrupt from
    irqdomain

 drivers/pci/msi.c   |  170 ++++++++++++++++++++++++++++++++++++++++-----------
 include/linux/msi.h |   90 ++++++++++++++++++++++++---
 kernel/irq/msi.c    |  150 ++++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 366 insertions(+), 44 deletions(-)

-- 
1.7.10.4