linux-kernel - [Patch V2 0/9] Refine generic/PCI MSI irqodmian interfaces

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Message-Id: <1416061447-9472-1-git-send-email-jiang.liu@linux.intel.com>
Date:	Sat, 15 Nov 2014 22:23:58 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Grant Likely <grant.likely@...aro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Yijing Wang <wangyijing@...wei.com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Matthias Brugger <matthias.bgg@...il.com>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [Patch V2 0/9] Refine generic/PCI MSI irqodmian interfaces

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 2-4 introduce mechanisms to help reduce irqdomain users' code size.
When converting XEN to use hierarchy irqdomain, I found the code size
increases about 100 lines. So we still need helpers to reduce code size.

Patch 5 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 6 introduces msi_domain_{alloc|free}_irqs() which generalize
pci_msi_domain_alloc_irqs() to support generic MSI.

Patch 7 introduces default data structures and callback implementations
to support msi_domain_alloc_irqs(), so reduce burden on generic MSI
users.

Patch 8 converts PCI MSI to use generic MSI interfaces, and also
implement default callbacks for PCI MSI.

Patch 9 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!

V1->V2:
1) Fix bugs reported by Marc
2) Rename MSI_FLAG_USE_DEF_OPS as MSI_FLAG_USE_DEF_DOM_OPS
3) Add support of MSI_FLAG_USE_DEF_CHIP_OPS
4) Include linxu/irqhandler.h to use irq_flow_handler_t instead of "void *"
5) Change iterfaces to pass in "nvect" to msi_domain_ops.msi_prepare()
6) Add new interfaces/flags to help reduce irqdomain users' code size

Jiang Liu (8):
  PCI, MSI: Fix errors caused by commit e5f1a59c4e12
  irqdomain: Implement a method to automatically call parent domain's
    alloc/free
  irqdomain: Introduce helper function irq_domain_add_hierarchy()
  PCI, MSI: Introduce helpers to hide struct msi_desc implementation
    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

Yingjoe Chen (1):
  irqdomain: Use consistent prototype for irq_domain_free_irqs_*

 drivers/pci/msi.c         |  181 ++++++++++++++++++++++++++++++++++++---------
 include/linux/irqdomain.h |   33 ++++-----
 include/linux/msi.h       |   99 ++++++++++++++++++++++---
 kernel/irq/irqdomain.c    |   93 +++++++++++++++++++++--
 kernel/irq/msi.c          |  169 ++++++++++++++++++++++++++++++++++++++++--
 5 files changed, 502 insertions(+), 73 deletions(-)

-- 
1.7.10.4

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