linux/drivers/virtio
Ladi Prosek 0ea1e4a6d9 virtio_ring: Make interrupt suppression spec compliant
According to the spec, if the VIRTIO_RING_F_EVENT_IDX feature bit is
negotiated the driver MUST set flags to 0. Not dirtying the available
ring in virtqueue_disable_cb also has a minor positive performance
impact, improving L1 dcache load missed by ~0.5% in vring_bench.

Writes to the used event field (vring_used_event) are still unconditional.

Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: <stable@vger.kernel.org> # f277ec4 virtio_ring: shadow available
Cc: <stable@vger.kernel.org>
Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-10-31 00:21:40 +02:00
..
config.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
Kconfig virtio_ring: Support DMA APIs 2016-03-02 17:01:57 +02:00
Makefile Add virtio-input driver. 2015-03-29 12:13:52 +10:30
virtio_balloon.c virtio/vhost: new features for 4.8 2016-08-06 09:20:13 -04:00
virtio_input.c virtio: make find_vqs() checkpatch.pl-friendly 2016-01-12 20:47:06 +02:00
virtio_mmio.c virtio_mmio: Use the DMA API if enabled 2016-03-02 17:01:58 +02:00
virtio_pci_common.c PCI changes for the v4.6 merge window: 2016-03-16 14:45:55 -07:00
virtio_pci_common.h virtio_pci: Use the DMA API if enabled 2016-03-02 17:01:58 +02:00
virtio_pci_legacy.c virtio_pci: Limit DMA mask to 44 bits for legacy virtio devices 2016-10-31 00:21:39 +02:00
virtio_pci_modern.c virtio: virtio 1.0 cs04 spec compliance for reset 2016-04-07 15:16:39 +03:00
virtio_ring.c virtio_ring: Make interrupt suppression spec compliant 2016-10-31 00:21:40 +02:00
virtio.c virtio: fix memory leak of virtio ida cache layers 2015-12-07 17:28:01 +02:00