linux-kernel - [PATCH v4 0/4] uio: add MSI/MSI-X support to uio_pci

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Date:	Tue,  6 Oct 2015 19:17:42 +0300
From:	Vlad Zolotarov <vladz@...udius-systems.com>
To:	linux-kernel@...r.kernel.org, mst@...hat.com, hjk@...sjkoch.de,
	corbet@....net, gregkh@...uxfoundation.org
Cc:	bruce.richardson@...el.com, avi@...udius-systems.com,
	gleb@...udius-systems.com, stephen@...workplumber.org,
	alexander.duyck@...il.com,
	Vlad Zolotarov <vladz@...udius-systems.com>
Subject: [PATCH v4 0/4] uio: add MSI/MSI-X support to uio_pci_generic driver

This series add support for MSI and MSI-X interrupts to uio_pci_generic driver.

Currently uio_pci_generic demands INT#x interrupts source be available. However
there are devices that simply don't have INT#x capability, for instance SR-IOV
VF devices that simply don't have INT#x capability. For such devices
uio_pci_generic will simply fail (more specifically its probe() will fail).

When IOMMU is either not available (e.g. Amazon EC2) or not acceptable due to
performance overhead and thus VFIO is not an option users that develop
user-space drivers are left without any option but to develop some proprietary
UIO drivers (e.g. igb_uio driver in Intel's DPDK) just to be able to use UIO
infrastructure.

This series provides a generic solution for this problem while preserving the
original behaviour for devices for which the original uio_pci_generic had worked
before (i.e. INT#x will be used by default).

New in v4:
   - Use portable __u32 and __s32 types from asm/types.h for
     defining uio_pci_generic_irq_set fields.
   - Use proper _IO macros for defining read and write ioctl()
     commands.
   - Moved bars mapping setting into a separate patch.
   - Update uio_pci_generic example in uio-howto.tmpl.

New in v3:
   - Add __iomem qualifier to temp buffer receiving ioremap value.  

New in v2:
   - Added #include <linux/uaccess.h> to uio_pci_generic.c

Vlad Zolotarov (4):
  uio: add ioctl support
  uio_pci_generic: properly initialize PCI bars mappings towards UIO
  uio_pci_generic: add MSI/MSI-X support
  Documentation: update uio-howto

 Documentation/DocBook/uio-howto.tmpl | 139 ++++++++++--
 drivers/uio/uio.c                    |  15 ++
 drivers/uio/uio_pci_generic.c        | 409 +++++++++++++++++++++++++++++++++--
 include/linux/uio_driver.h           |   3 +
 include/uapi/linux/uio_pci_generic.h |  51 +++++
 5 files changed, 574 insertions(+), 43 deletions(-)
 create mode 100644 include/uapi/linux/uio_pci_generic.h

-- 
2.1.0

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