Alex Williamson e309df5b0c vfio/pci: Parallelize device open and release ... In commit 61d792562b ("vfio-pci: Use mutex around open, release, and remove") a mutex was added to freeze the refcnt for a device so that we can handle errors and perform bus resets on final close. However, bus resets can be rather slow and a global mutex here is undesirable. Evaluating the potential locking granularity, a per-device mutex provides the best resolution but with multiple devices on a bus all released concurrently, they'll race to acquire each other's mutex, likely resulting in no reset at all if we use trylock. We therefore lock at the granularity of the bus/slot reset as we're only attempting a single reset for this group of devices anyway. This allows much greater scaling as we're bounded in the number of devices protected by a single reflck object. Reported-by: Christian Ehrhardt <christian.ehrhardt@canonical.com> Tested-by: Christian Ehrhardt <christian.ehrhardt@canonical.com> Reviewed-by: Eric Auger <eric.auger@redhat.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>		2018-12-12 12:51:07 -07:00
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mdev	vfio/mdev: Re-order sysfs attribute creation	2018-06-08 10:24:30 -06:00
pci	vfio/pci: Parallelize device open and release	2018-12-12 12:51:07 -07:00
platform	vfio: platform: Fix using devices in PM Domains	2018-06-08 10:24:37 -06:00
Kconfig	drivers/vfio: Allow type-1 IOMMU instantiation with all ARM/ARM64 IOMMUs	2018-09-25 13:01:28 -06:00
Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
vfio_iommu_spapr_tce.c	KVM: PPC: Optimize clearing TCEs for sparse tables	2018-10-20 20:47:02 +11:00
vfio_iommu_type1.c	vfio: Mark expected switch fall-throughs	2018-08-06 12:22:54 -06:00
vfio_spapr_eeh.c	drivers/vfio: Support EEH error injection	2015-05-12 20:33:35 +10:00
vfio.c	vfio: use match_string() helper	2018-06-08 10:24:33 -06:00
virqfd.c	fs: add new vfs_poll and file_can_poll helpers	2018-05-26 09:16:44 +02:00