Messages in this thread | | | From | Vlad Zolotarov <> | Subject | [PATCH v4 0/4] uio: add MSI/MSI-X support to uio_pci_generic driver | Date | Tue, 6 Oct 2015 19:17:42 +0300 |
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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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