linux-toradex.git/include/linux/vringh.h, branch v6.0-rc1

vringh: pull in spinlock header

2021-08-11T10:44:24+00:00

we use a spinlock now pull in the correct header to
make vring.h self sufficient.

Signed-off-by: Michael S. Tsirkin

vringh: add vringh_kiov_length() helper

2021-05-03T08:55:53+00:00

This new helper returns the total number of bytes covered by
a vringh_kiov.

Suggested-by: Jason Wang 
Acked-by: Jason Wang 
Signed-off-by: Stefano Garzarella 
Link: https://lore.kernel.org/r/20210315163450.254396-7-sgarzare@redhat.com
Signed-off-by: Michael S. Tsirkin

vringh: implement vringh_kiov_advance()

2021-05-03T08:55:53+00:00

In some cases, it may be useful to provide a way to skip a number
of bytes in a vringh_kiov.

Let's implement vringh_kiov_advance() for this purpose, reusing the
code from vringh_iov_xfer().
We replace that code calling the new vringh_kiov_advance().

Acked-by: Jason Wang 
Signed-off-by: Stefano Garzarella 
Link: https://lore.kernel.org/r/20210315163450.254396-6-sgarzare@redhat.com
Signed-off-by: Michael S. Tsirkin

vringh: add 'iotlb_lock' to synchronize iotlb accesses

2021-05-03T08:55:52+00:00

Usually iotlb accesses are synchronized with a spinlock.
Let's request it as a new parameter in vringh_set_iotlb() and
hold it when we navigate the iotlb in iotlb_translate() to avoid
race conditions with any new additions/deletions of ranges from
the ioltb.

Acked-by: Jason Wang 
Signed-off-by: Stefano Garzarella 
Link: https://lore.kernel.org/r/20210315163450.254396-3-sgarzare@redhat.com
Signed-off-by: Michael S. Tsirkin

virtio: force spec specified alignment on types

2020-06-02T06:45:13+00:00

The ring element addresses are passed between components with different
alignments assumptions. Thus, if guest/userspace selects a pointer and
host then gets and dereferences it, we might need to decrease the
compiler-selected alignment to prevent compiler on the host from
assuming pointer is aligned.

This actually triggers on ARM with -mabi=apcs-gnu - which is a
deprecated configuration, but it seems safer to handle this
generally.

Note that userspace that allocates the memory is actually OK and does
not need to be fixed, but userspace that gets it from guest or another
process does need to be fixed. The later doesn't generally talk to the
kernel so while it might be buggy it's not talking to the kernel in the
buggy way - it's just using the header in the buggy way - so fixing
header and asking userspace to recompile is the best we can do.

I verified that the produced kernel binary on x86 is exactly identical
before and after the change.

Signed-off-by: Michael S. Tsirkin 
Acked-by: Jason Wang

virtio/test: fix up after IOTLB changes

2020-04-16T22:31:08+00:00

Allow building vringh without IOTLB (that's the case for userspace
builds, will be useful for CAIF/VOD down the road too).
Update for API tweaks.
Don't include vringh with userspace builds.

Cc: Jason Wang 
Cc: Eugenio Pérez 
Signed-off-by: Michael S. Tsirkin 
Acked-by: Jason Wang

vringh: IOTLB support

2020-04-01T16:06:26+00:00

This patch implements the third memory accessor for vringh besides
current kernel and userspace accessors. This idea is to allow vringh
to do the address translation through an IOTLB which is implemented
via vhost_map interval tree. Users should setup and IOVA to PA mapping
in this IOTLB.

This allows us to:

- Use vringh to access virtqueues with vIOMMU
- Use vringh to implement software virtqueues for vDPA devices

Signed-off-by: Jason Wang 
Link: https://lore.kernel.org/r/20200326140125.19794-5-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156

2019-05-30T18:26:35+00:00

Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this program if not write to the free software foundation inc
  59 temple place suite 330 boston ma 02111 1307 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner 
Reviewed-by: Allison Randal 
Reviewed-by: Richard Fontana 
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman

virtio: add explicit big-endian support to memory accessors

2015-06-01T13:48:54+00:00

The current memory accessors logic is:
- little endian if little_endian
- native endian (i.e. no byteswap) if !little_endian

If we want to fully support cross-endian vhost, we also need to be
able to convert to big endian.

Instead of changing the little_endian argument to some 3-value enum, this
patch changes the logic to:
- little endian if little_endian
- big endian if !little_endian

The native endian case is handled by all users with a trivial helper. This
patch doesn't change any functionality, nor it does add overhead.

Signed-off-by: Greg Kurz 

Signed-off-by: Michael S. Tsirkin 
Reviewed-by: Cornelia Huck 
Reviewed-by: David Gibson

vringh: introduce vringh_is_little_endian() helper

2015-06-01T13:48:52+00:00

Signed-off-by: Greg Kurz 

Signed-off-by: Michael S. Tsirkin 
Acked-by: Cornelia Huck 
Reviewed-by: David Gibson