Hey Rusty,
This series adds support for generic ports with each port getting two
vqs: one for input and one for output. The host notifies us via the
config space of the max. number of ports that can be added for a
particular device.
As a result of that change, the buffer management for find_readbufs
and send_bufs is moved to the vqs. Only one outbuf per port is used
so we bide away some time in the send_buf routine if output data spans
multiple pages.
There are a few things which aren't done, they can be built upon this
series once it's accepted. One of them is maintaining a list of the
pages that are fed into the virtqueues. This list will be needed when
those buffers have to be freed.
I've passed each patch through an automated test suite that tests for
all the functionality here (caching, throttling, hotplug, hot-unplug,
console IO) twice: once with a qemu that supports this functionality
and once without, to test for backward compat. It all works fine.
The testsuite tests for:
* the 'name' attribute and the symlinks that get created via udev
scripts in /dev/virtio-ports
* caching
* throttling
* console - with running 'find /' in the guest
* open/close of chardevs
* read/write/poll
* sending a large file (> 100 MB) in either direction and matching
sha1sums.
Please review.
Thanks,
Amit
Amit Shah (25):
hvc_console: Remove __devinit annotation from hvc_alloc
virtio: console: We support only one device at a time
virtio: console: encapsulate buffer information in a struct
virtio: console: ensure add_inbuf can work for multiple ports as well
virtio: console: introduce a get_inbuf helper to fetch bufs from
in_vq
virtio: console: don't assume a single console port.
virtio: console: struct ports for multiple ports per device.
virtio: console: ensure console size is updated on hvc open
virtio: console: Separate out console-specific data into a separate
struct
virtio: console: Separate out console init into a new function
virtio: console: Separate out find_vqs operation into a different
function
virtio: console: Buffer data that comes from the host
virtio: console: Introduce a send_buf function for a common path for
sending data to host
virtio: console: Introduce a 'header' for each buffer towards
supporting multiport
virtio: console: Add a new MULTIPORT feature, support for generic
ports
virtio: console: Prepare for writing to / reading from userspace
buffers
virtio: console: Associate each port with a char device
virtio: console: Add file operations to ports for
open/read/write/poll
virtio: console: Ensure only one process can have a port open at a
time
virtio: console: Register with sysfs and create a 'name' attribute
for ports
virtio: console: Add throttling support to prevent flooding ports
virtio: console: Add option to remove cached buffers on port close
virtio: console: Handle port hot-plug
virtio: console: Add ability to hot-unplug ports
virtio: console: Add debugfs files for each port to expose debug info
Rusty Russell (6):
virtio: console: comment cleanup
virtio: console: statically initialize virtio_cons
hvc_console: make the ops pointer const.
virtio: console: port encapsulation
virtio: console: use vdev->priv to avoid accessing global var.
virtio: console: remove global var
drivers/char/Kconfig | 8 +
drivers/char/hvc_beat.c | 2 +-
drivers/char/hvc_console.c | 9 +-
drivers/char/hvc_console.h | 9 +-
drivers/char/hvc_iseries.c | 2 +-
drivers/char/hvc_iucv.c | 2 +-
drivers/char/hvc_rtas.c | 2 +-
drivers/char/hvc_udbg.c | 2 +-
drivers/char/hvc_vio.c | 2 +-
drivers/char/hvc_xen.c | 2 +-
drivers/char/virtio_console.c | 1575 ++++++++++++++++++++++++++++++++++++----
include/linux/virtio_console.h | 44 ++-
12 files changed, 1498 insertions(+), 161 deletions(-)
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