Hello Eric, I'm not sure I understand the issue here. I tried to reproduce the bug by triggering an interrupt without unmasking it, but the interrupt is unmasked when the program access to the device (vfio_platform_open reinit IRQs).
May I have more details on the bug ? Thanks On Fri, Jan 9, 2015 at 12:33 PM, Antonios Motakis < a.mota...@virtualopensystems.com> wrote: > On Fri, Jan 9, 2015 at 9:39 AM, Eric Auger <eric.au...@linaro.org> wrote: > > Hi Antonios, > > > > when moving to 3.19rc3 I observe a regression with my xgmac use case > > (real-time change?). > > > > I guess what happens is when I kill a first qemu session, guest does not > > have time to complete the virtual IRQ and the unmask is not performed by > > the virqfd handler. When starting a new QEMU session, the irqfd > > signalling is put in place again but since the masked field is set, the > > IRQ is left unmasked (v11 modification in vfio_set_trigger). > > > > The problem is that we don't discriminate between user mask action and > > automasked handler action. In case the user did not mask, I think we > > should reset the masked field when doing the free_irq. What do you think? > > Hello Eric, > > I agree, we should reset the masked field for future users. > > Best regards > Antonios > > > > > Best Regards > > > > Eric > > > > On 01/06/2015 11:48 AM, Antonios Motakis wrote: > >> This patch series aims to implement VFIO support for platform devices > that > >> reside behind an IOMMU. Examples of such devices are devices behind an > ARM > >> SMMU, or behind a Samsung Exynos System MMU. > >> > >> The API used is based on the existing VFIO API that is also used with > PCI > >> devices. Only devices that include a basic set of IRQs and memory > regions are > >> targeted; devices with complex relationships with other devices on a > device > >> tree are not taken into account at this stage. > >> > >> This patch series may be applied on the following series/patches: > >> - [PATCH] driver core: amba: add device binding path 'driver_override' > >> - [PATCH v3 0/6] vfio: type1: support for ARM SMMUS with > VFIO_IOMMU_TYPE1 > >> > >> A copy can be cloned from the branch vfio-platform-v11 at: > >> g...@github.com:virtualopensystems/linux-kvm-arm.git > >> > >> Changes since v10: > >> - Check if interrupt is already masked when setting a new trigger > >> - Fixed kasprintf with unchecked return value in VFIO AMBA driver > >> Changes since v9: > >> - Reworked the splitting of the patches that decouple virqfd from PCI > >> - Some styling issues and typos > >> - Removed superfluous includes > >> - AMBA devices are now named vfio-amba- suffixed by the AMBA device id > >> - Several other cleanups and fixes > >> Changes since v8: > >> - Separate irq handler for edge and level triggered interrupts > >> - Mutex based lock for VFIO fd open/release > >> - Fixed bug where the first region of a platform device wasn't exposed > >> - Read only regions can be MMAPed only read only > >> - Code cleanups > >> Changes since v7: > >> - Some initial placeholder functionality for PIO resources > >> - Cleaned up code for IRQ triggering, masking and unmasking > >> - Some functionality has been removed from this series and posted > separately: > >> - VFIO_IOMMU_TYPE1 support for ARM SMMUs > >> - IOMMU NOEXEC patches > >> - driver_override functionality for AMBA devices > >> - Several fixes > >> Changes since v6: > >> - Integrated support for AMBA devices > >> - Numerous cleanups and fixes > >> Changes since v5: > >> - Full eventfd support for IRQ masking and unmasking. > >> - Changed IOMMU_EXEC to IOMMU_NOEXEC, along with related flags in VFIO. > >> - Other fixes based on reviewer comments. > >> Changes since v4: > >> - Use static offsets for each region in the VFIO device fd > >> - Include patch in the series for the ARM SMMU to expose IOMMU_EXEC > >> availability via IOMMU_CAP_DMA_EXEC > >> - Rebased on VFIO multi domain support: > >> - IOMMU_EXEC is now available if at least one IOMMU in the container > >> supports it > >> - Expose IOMMU_EXEC if available via the capability > VFIO_IOMMU_PROT_EXEC > >> - Some bug fixes > >> Changes since v3: > >> - Use Kim Phillips' driver_probe_device() > >> Changes since v2: > >> - Fixed Read/Write and MMAP on device regions > >> - Removed dependency on Device Tree > >> - Interrupts support > >> - Interrupt masking/unmasking > >> - Automask level sensitive interrupts > >> - Introduced VFIO_DMA_MAP_FLAG_EXEC > >> - Code clean ups > >> > >> Antonios Motakis (20): > >> vfio/platform: initial skeleton of VFIO support for platform devices > >> vfio: platform: probe to devices on the platform bus > >> vfio: platform: add the VFIO PLATFORM module to Kconfig > >> vfio: amba: VFIO support for AMBA devices > >> vfio: amba: add the VFIO for AMBA devices module to Kconfig > >> vfio/platform: return info for bound device > >> vfio/platform: return info for device memory mapped IO regions > >> vfio/platform: read and write support for the device fd > >> vfio/platform: support MMAP of MMIO regions > >> vfio/platform: return IRQ info > >> vfio/platform: initial interrupts support code > >> vfio/platform: trigger an interrupt via eventfd > >> vfio/platform: support for level sensitive interrupts > >> vfio: add a vfio_ prefix to virqfd_enable and virqfd_disable and > >> export > >> vfio: virqfd: rename vfio_pci_virqfd_init and vfio_pci_virqfd_exit > >> vfio: add local lock for virqfd instead of depending on VFIO PCI > >> vfio: pass an opaque pointer on virqfd initialization > >> vfio: move eventfd support code for VFIO_PCI to a separate file > >> vfio: initialize the virqfd workqueue in VFIO generic code > >> vfio/platform: implement IRQ masking/unmasking via an eventfd > >> > >> drivers/vfio/Kconfig | 1 + > >> drivers/vfio/Makefile | 5 +- > >> drivers/vfio/pci/vfio_pci.c | 8 - > >> drivers/vfio/pci/vfio_pci_intrs.c | 238 +----------- > >> drivers/vfio/pci/vfio_pci_private.h | 3 - > >> drivers/vfio/platform/Kconfig | 19 + > >> drivers/vfio/platform/Makefile | 8 + > >> drivers/vfio/platform/vfio_amba.c | 115 ++++++ > >> drivers/vfio/platform/vfio_platform.c | 103 +++++ > >> drivers/vfio/platform/vfio_platform_common.c | 520 > ++++++++++++++++++++++++++ > >> drivers/vfio/platform/vfio_platform_irq.c | 340 +++++++++++++++++ > >> drivers/vfio/platform/vfio_platform_private.h | 82 ++++ > >> drivers/vfio/vfio.c | 8 + > >> drivers/vfio/virqfd.c | 213 +++++++++++ > >> include/linux/vfio.h | 27 ++ > >> include/uapi/linux/vfio.h | 2 + > >> 16 files changed, 1456 insertions(+), 236 deletions(-) > >> create mode 100644 drivers/vfio/platform/Kconfig > >> create mode 100644 drivers/vfio/platform/Makefile > >> create mode 100644 drivers/vfio/platform/vfio_amba.c > >> create mode 100644 drivers/vfio/platform/vfio_platform.c > >> create mode 100644 drivers/vfio/platform/vfio_platform_common.c > >> create mode 100644 drivers/vfio/platform/vfio_platform_irq.c > >> create mode 100644 drivers/vfio/platform/vfio_platform_private.h > >> create mode 100644 drivers/vfio/virqfd.c > >> > > >
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