Hello,
This series reworks the ABI to allow port discovery (only) via the
control queue and enable multiport again.
In addition, it adds support for non-blocking write() support, which
means no spinning. This works fine with the recent patches that are on
qemu-devel.
Also included is removal of hvc_remove() as removing one such console
port causes other console ports (registered with hvc) to stall. This
has to be debugged in the hvc_console.c file, I'll do that later, but
we have a nice workaround for this: returning -EPIPE on any hvc
operations will make the hvc console core perform any cleanups for the
removed ports. Looks like we don't lose much by removing hvc_remove().
New in this version:
- Locking for the out_vq. Slightly changed version compared to the
diff I sent earlier in that I don't lock inside
reclaim_used_buffers() now, letting us use spin_lock_irq() instead
of spin_lock_irqsave() from non-irq contexts.
- Remove extra line spotted by Rusty
Rusty, please apply for -next if all is well.
Amit Shah (11):
Revert "virtio: disable multiport console support."
virtio: console: Add a __send_control_msg() that can send messages
without a valid port
virtio: console: Let host know of port or device add failures
virtio: console: Return -EPIPE to hvc_console if we lost the
connection
virtio: console: Don't call hvc_remove() on unplugging console ports
virtio: console: Remove config work handler
virtio: console: Move code around for future patches
virtio: console: Use a control message to add ports
virtio: console: Don't always create a port 0 if using multiport
virtio: console: Rename wait_is_over() to will_read_block()
virtio: console: Add support for nonblocking write()s
drivers/char/virtio_console.c | 605 ++++++++++++++++++++--------------------
include/linux/virtio_console.h | 25 ++
2 files changed, 334 insertions(+), 296 deletions(-)
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