linux-toradex.git/include/xen/interface, branch v4.12-rc4

xen/displif: add ABI for para-virtual display

2017-05-02T09:13:09+00:00

This is the ABI for the two halves of a para-virtualized
display driver.

This protocol aims to provide a unified protocol which fits more
sophisticated use-cases than a framebuffer device can handle. At the
moment basic functionality is supported with the intention to extend:
  o multiple dynamically allocated/destroyed framebuffers
  o buffers of arbitrary sizes
  o better configuration options including multiple display support

Note: existing fbif can be used together with displif running at the
same time, e.g. on Linux one provides framebuffer and another DRM/KMS

Future extensions to the existing protocol may include:
  o allow display/connector cloning
  o allow allocating objects other than display buffers
  o add planes/overlays support
  o support scaling
  o support rotation

Note, that this protocol doesn't use ring macros for
bi-directional exchange (PV calls/9pfs) bacause:
  o it statically defines the use of a single page
    for the ring buffer
  o it uses direct memory access to ring's contents
    w/o memory copying
  o re-uses the same idea that kbdif/fbif use
    which for this use-case seems to be appropriate

==================================================
Rationale for introducing this protocol instead of
using the existing fbif:
==================================================

1. In/out event sizes
  o fbif - 40 octets
  o displif - 40 octets
This is only the initial version of the displif protocol
which means that there could be requests which will not fit
(WRT introducing some GPU related functionality
later on). In that case we cannot alter fbif sizes as we need to
be backward compatible an will be forced to handle those
apart of fbif.

2. Shared page
Displif doesn't use anything like struct xenfb_page, but
DEFINE_RING_TYPES(xen_displif, struct xendispl_req, struct
xendispl_resp) which is a better and more common way.
Output events use a shared page which only has in_cons and in_prod
and all the rest is used for incoming events. Here struct xenfb_page
could probably be used as is despite the fact that it only has a half
of a page for incoming events which is only 50 events. (consider
something like 60Hz display)

3. Amount of changes.
fbif only provides XENFB_TYPE_UPDATE and XENFB_TYPE_RESIZE
events, so it looks like it is easier to get fb support into displif
than vice versa. displif at the moment has 6 requests and 1 event,
multiple connector support, etc.

Signed-off-by: Oleksandr Grytsov 
Signed-off-by: Oleksandr Andrushchenko 
Acked-by: Juergen Gross 
Signed-off-by: Juergen Gross

xen/sndif: add sound-device ABI

2017-05-02T09:13:03+00:00

Add ABI for the two halves of a para-virtualized
sound driver to communicate with each other.

The ABI allows implementing audio playback and capture as
well as volume control and possibility to mute/unmute
audio sources.

Note: depending on the use-case backend can expose more sound
cards and PCM devices/streams than the underlying HW physically
has by employing SW mixers, configuring virtual sound streams,
channels etc. Thus, allowing fine tunned configurations per
frontend.

Signed-off-by: Oleksandr Andrushchenko 
Signed-off-by: Oleksandr Grytsov 
Signed-off-by: Oleksandr Dmytryshyn 
Signed-off-by: Iurii Konovalenko 
Acked-by: Juergen Gross 
Signed-off-by: Juergen Gross

xen/kbdif: add multi-touch support

2017-05-02T09:12:56+00:00

Multi-touch fields re-use the page that is used by the other features
which means that you can interleave multi-touch, motion, and key
events.

Signed-off-by: Oleksandr Andrushchenko 
Acked-by: Juergen Gross 
Signed-off-by: Juergen Gross

xen/kbdif: update protocol description

2017-05-02T09:12:50+00:00

The patch clarifies the protocol that is used by the PV keyboard
drivers.

Signed-off-by: Oleksandr Andrushchenko 
Acked-by: Juergen Gross 
Signed-off-by: Juergen Gross

xen: introduce the header file for the Xen 9pfs transport protocol

2017-05-02T09:11:08+00:00

It uses the new ring.h macros to declare rings and interfaces.

CC: konrad.wilk@oracle.com
CC: boris.ostrovsky@oracle.com
CC: jgross@suse.com
CC: groug@kaod.org

Signed-off-by: Stefano Stabellini 
Acked-by: Juergen Gross 
Signed-off-by: Juergen Gross

xen: import new ring macros in ring.h

2017-05-02T09:10:59+00:00

Sync the ring.h file with upstream Xen, to introduce the new ring macros.
They will be used by the Xen transport for 9pfs.

CC: konrad.wilk@oracle.com
CC: boris.ostrovsky@oracle.com
CC: jgross@suse.com
CC: groug@kaod.org

Signed-off-by: Stefano Stabellini 
Acked-by: Juergen Gross 
Signed-off-by: Juergen Gross

scripts/spelling.txt: add "an union" pattern and fix typo instances

2017-02-28T02:43:46+00:00

Fix typos and add the following to the scripts/spelling.txt:

  an union||a union

Link: http://lkml.kernel.org/r/1481573103-11329-5-git-send-email-yamada.masahiro@socionext.com
Signed-off-by: Masahiro Yamada 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

xen/privcmd: Add IOCTL_PRIVCMD_DM_OP

2017-02-14T20:13:43+00:00

Recently a new dm_op[1] hypercall was added to Xen to provide a mechanism
for restricting device emulators (such as QEMU) to a limited set of
hypervisor operations, and being able to audit those operations in the
kernel of the domain in which they run.

This patch adds IOCTL_PRIVCMD_DM_OP as gateway for __HYPERVISOR_dm_op.

NOTE: There is no requirement for user-space code to bounce data through
      locked memory buffers (as with IOCTL_PRIVCMD_HYPERCALL) since
      privcmd has enough information to lock the original buffers
      directly.

[1] http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=524a98c2

Signed-off-by: Paul Durrant 
Acked-by: Stefano Stabellini 
Signed-off-by: Boris Ostrovsky

xen/pvh: Import PVH-related Xen public interfaces

2017-02-07T13:07:01+00:00

Signed-off-by: Boris Ostrovsky 
Reviewed-by: Juergen Gross 
Reviewed-by: Konrad Rzeszutek Wilk

xen: Sync xen header

2016-09-05T11:52:37+00:00

Import the actual version of include/xen/interface/sched.h from Xen.

Signed-off-by: Juergen Gross 
Signed-off-by: Peter Zijlstra (Intel) 
Acked-by: David Vrabel 
Cc: Douglas_Warzecha@dell.com
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: akataria@vmware.com
Cc: boris.ostrovsky@oracle.com
Cc: chrisw@sous-sol.org
Cc: hpa@zytor.com
Cc: jdelvare@suse.com
Cc: jeremy@goop.org
Cc: linux@roeck-us.net
Cc: pali.rohar@gmail.com
Cc: rusty@rustcorp.com.au
Cc: virtualization@lists.linux-foundation.org
Cc: xen-devel@lists.xenproject.org
Link: http://lkml.kernel.org/r/1472453327-19050-2-git-send-email-jgross@suse.com
Signed-off-by: Ingo Molnar