linux-kernel - [RFC 0/4] Introduce a mechanism to allocate PCI IRQ on demand

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Message-Id: <1430968374-29286-1-git-send-email-jiang.liu@linux.intel.com>
Date:	Thu,  7 May 2015 11:12:50 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Lv Zheng <lv.zheng@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org, "x86 @ kernel . org" <x86@...nel.org>
Subject: [RFC 0/4] Introduce a mechanism to allocate PCI IRQ on demand

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 and is available at:
https://github.com/jiangliu/linux.git pci_irq_v1

Thanks!
Gerry

Jiang Liu (4):
  PCI: Add hooks to allocate/free IRQ resources when binding/unbinding
    driver
  PCI, MSI: Optionally free legacy PCI IRQ when enabling MSI/MSI-X
  PCI, x86: Allocate PCI IRQ on demand and free it when not used
    anymore
  PCI: Introduce helpers to manage pci_dev->irq and
    pci_dev->irq_managed

 arch/x86/include/asm/pci_x86.h |    2 --
 arch/x86/pci/common.c          |   20 +++++++++-----------
 arch/x86/pci/intel_mid_pci.c   |    9 ++++++---
 arch/x86/pci/irq.c             |   23 ++++-------------------
 drivers/acpi/pci_irq.c         |   17 ++++-------------
 drivers/pci/msi.c              |    6 +++++-
 drivers/pci/pci-driver.c       |   33 +++++++++++++++++++++++----------
 include/linux/pci.h            |   19 +++++++++++++++++++
 8 files changed, 70 insertions(+), 59 deletions(-)

-- 
1.7.10.4

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