linux

iv/linux

History

Michael S. Tsirkin 8d622d21d2 virtio: fix up virtio_disable_cb

virtio_disable_cb is currently a nop for split ring with event index.
This is because it used to be always called from a callback when we know
device won't trigger more events until we update the index.  However,
now that we run with interrupts enabled a lot we also poll without a
callback so that is different: disabling callbacks will help reduce the
number of spurious interrupts.
Further, if using event index with a packed ring, and if being called
from a callback, we actually do disable interrupts which is unnecessary.

Fix both issues by tracking whenever we get a callback. If that is
the case disabling interrupts with event index can be a nop.
If not the case disable interrupts. Note: with a split ring
there's no explicit "no interrupts" value. For now we write
a fixed value so our chance of triggering an interupt
is 1/ring size. It's probably better to write something
related to the last used index there to reduce the chance
even further. For now I'm keeping it simple.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

2021-07-03 04:51:18 -04:00

Kconfig

virtio-pci: introduce modern device module

2021-02-23 07:52:58 -05:00

Makefile

virtio-pci: introduce modern device module

2021-02-23 07:52:58 -05:00

virtio_balloon.c

virtio_balloon: specify page reporting order if needed

2021-06-29 10:53:47 -07:00

virtio_dma_buf.c

virtio: fix build for configs without dma-bufs