linux-kernel - Re: [PATCH v3 0/3] uio: add MSI/MSI-X support to uio_pci

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Message-ID: <56118FD6.5020902@cloudius-systems.com>
Date:	Sun, 4 Oct 2015 23:45:10 +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
Subject: Re: [PATCH v3 0/3] uio: add MSI/MSI-X support to uio_pci_generic
 driver

This is the same v3 but with the correct email address of Greg. In the 
first iteration the first letter of the email was missing... ;)

On 10/04/15 23:43, Vlad Zolotarov wrote:
> This series add support for MSI and MSI-X interrupts to uio_pci_generic driver.
>   
> Currently uio_pci_generic supports only legacy INT#x interrupts source. However
> there are situations when this is not enough, 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 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 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 (3):
>    uio: add ioctl support
>    uio_pci_generic: add MSI/MSI-X support
>    Documentation: update uio-howto
>
>   Documentation/DocBook/uio-howto.tmpl |  29 ++-
>   drivers/uio/uio.c                    |  15 ++
>   drivers/uio/uio_pci_generic.c        | 410 +++++++++++++++++++++++++++++++++--
>   include/linux/uio_driver.h           |   3 +
>   include/linux/uio_pci_generic.h      |  36 +++
>   5 files changed, 467 insertions(+), 26 deletions(-)
>   create mode 100644 include/linux/uio_pci_generic.h
>

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